CN211955317U - Ultrasonic oxygen detection device - Google Patents
Ultrasonic oxygen detection device Download PDFInfo
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- CN211955317U CN211955317U CN201921497560.7U CN201921497560U CN211955317U CN 211955317 U CN211955317 U CN 211955317U CN 201921497560 U CN201921497560 U CN 201921497560U CN 211955317 U CN211955317 U CN 211955317U
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Abstract
The utility model discloses an ultrasonic oxygen detection device, which comprises a power circuit, a microcontroller and a peripheral circuit thereof, a detection circuit, a LED indicating circuit and a sensor; the microcontroller, the peripheral circuit thereof, the detection circuit and the LED indicating circuit are all connected with the power circuit; the microcontroller and the peripheral circuit thereof, the sensor and the detection circuit are connected in sequence; the LED indicating circuit is connected with the microcontroller and peripheral circuits thereof; the sensor comprises an ultrasonic sensor and a temperature sensor; the detection circuit comprises an echo detection circuit and a temperature detection circuit; the ultrasonic sensor, the echo detection circuit, the microcontroller and the peripheral circuit thereof are connected in sequence; the temperature sensor, the temperature detection circuit, the microcontroller and the peripheral circuit thereof are connected in sequence. The novel device solves the safety problem existing in the traditional detection method, the oxygen detection process is simple and convenient, and the novel device has the characteristics of small volume, rapid reaction, high accuracy, short development period and the like.
Description
Technical Field
The utility model relates to an oxygen analysis's technical field especially relates to an ultrasonic wave oxygen detection device.
Background
In recent years, environmental pollution problems derived from rapid development of industries such as ferrous metallurgy, petrochemical industry, electric power, paper making and the like have brought great pressure on sustainable development of China, the analysis and control capability of the production process is urgently required to be improved, and energy conservation and emission reduction become national policies of China. Oxygen is taken as combustion-supporting gas in the combustion process of industrial production and gas which human beings rely on to live, and online monitoring of the concentration of the oxygen becomes one of important means for energy conservation and emission reduction.
Most of the existing sensors for monitoring oxygen concentration measure the oxygen concentration through the resistance or capacitance change of a probe, and are easily interfered by external electromagnetic waves. And oxygen is combustion-supporting gas and is directly contacted with the resistor capacitor, so that certain potential safety hazard exists. The semiconductor gas sensitive element has simple structure, is practical and convenient, is not suitable for accurately analyzing gas, and is mainly used for rough identification and qualitative analysis. In addition, a spectrum absorption type gas sensor is provided, because the oxygen absorption intensity is much lower than that of other gases in the atmosphere, the detection by using a spectrum absorption method of a traditional light source is very difficult, and the application of the spectrum of the light source is limited by the width and the light intensity factor of the light source.
Oxygen is also an essential product for adjuvant therapy, and has unique effects in rehabilitation medicine, health care medicine, preventive medicine and the like. However, the float-type flow meter is mainly used for monitoring the oxygen flow in the hospital at present, and has the problems of incapability of quantifying the flow, large error, difficulty in control and the like. There is a pressing need to develop new oxygen flow meters to meet the needs of medical testing. The gas flow detection technology mainly comprises thermal type mass flow detection, gas turbine flow detection, volumetric flow detection and the like, and the technologies have the defects of large error ratio, high possibility of interference, poor stability, high possibility of drifting and the like.
The ultrasonic wave is a mechanical wave with the frequency higher than 20KHz, can avoid the influence of peripheral noise on signals during signal acquisition, and has the characteristics of good directionality, concentrated energy, simple structure, small volume and the like. With the rapid development of the ultrasonic metering detection technology, the ultrasonic metering detection technology has increasingly wide application in industries such as industry, mechanical automation and the like. The ultrasonic oxygen detection device overcomes the defects of the traditional detection method, can meet the requirement of high-precision measurement, can detect oxygen under the relatively safe condition, can completely adapt to the challenge of future high-precision measurement, and continuously keeps the leading position in the field of gas detection.
Based on the ultrasonic detection technology, the ultrasonic oxygen detection device simultaneously detects the oxygen concentration and the oxygen flow through hardware equipment such as a receiving and transmitting integrated ultrasonic sensor, a microcontroller and the like. The detection device has the characteristics of small volume, quick response, stable measurement, high accuracy and the like.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome above-mentioned prior art not enough, provided an ultrasonic wave oxygen detection device, but on-line measuring oxygen concentration and flow, stability is strong, detects oxygen concentration and flow on the hardware platform that modules such as microcontroller, ultrasonic sensor were built, has characteristics such as small, safe and reliable, long service life, stability height, low price, satisfies current measurement accuracy requirement to oxygen concentration and flow.
The utility model discloses at least, one of following technical scheme realizes.
An ultrasonic oxygen detection device comprises a power supply circuit, a microcontroller and peripheral circuits thereof, a sensor, a detection circuit and an LED indicating circuit; the microcontroller, the peripheral circuit thereof, the detection circuit and the LED indicating circuit are all connected with the power circuit; the microcontroller and the peripheral circuit thereof, the sensor and the detection circuit are connected in sequence; the LED indicating circuit is connected with the microcontroller and peripheral circuits thereof.
Furthermore, the LED indicating circuit mainly comprises a plurality of light emitting diodes, and the plurality of light emitting diodes are respectively connected with pins of the microcontroller.
Furthermore, the detection circuit comprises an echo detection circuit and a temperature detection circuit which are connected with the microcontroller and peripheral circuits thereof; the echo detection circuit mainly comprises a first TLV272 chip, a second TLV272 chip and an SN74LVC1G3157 chip, wherein the first TLV272 chip, the SN74LVC1G3157 chip and the second TLV272 chip are connected in sequence; the temperature detection circuit mainly comprises a TLV272 chip.
Further, the sensors comprise a first ultrasonic sensor, a second ultrasonic sensor and a temperature sensor; first ultrasonic sensor, second ultrasonic sensor interconnect, first ultrasonic sensor, second ultrasonic sensor all are connected with echo detection circuitry simultaneously, and temperature sensor and temperature detection circuitry are connected.
Further, the power supply circuit comprises a 5.0V voltage stabilizing module and a 3.3V voltage stabilizing module, and the 5.0V voltage stabilizing module is connected with the 3.3V voltage stabilizing module; the 3.3V voltage stabilizing module supplies power to the microcontroller and peripheral circuits, the detection circuit and the LED indicating circuit thereof; the 5.0V voltage stabilizing module is connected with an external 12V direct current power supply.
Further, the 5.0V voltage stabilizing module is an ASM117 power supply module; the 3.3V voltage stabilizing module is a TLV7023 power supply module.
The power supply circuit takes an external 12V direct-current power supply as an input end of the circuit, 12.0V outputs 5.0V through the ASM117 power supply module, and the working voltage of 3.3V is provided through the TLV7023 power supply module to supply power for the microcontroller and peripheral circuits, the detection circuit and the LED indicating circuit thereof.
The detection circuit comprises an echo detection circuit and a temperature detection circuit. The echo detection circuit receives the voltage signal converted by the ultrasonic sensor through the switching network, amplifies the voltage signal through the operational amplifier, and transmits the amplified voltage signal to the microcontroller after filtering processing. The temperature detection circuit takes an NTC type thermistor as a core and transmits voltage corresponding to the resistance value of the thermistor to the microcontroller.
And the LED indicating circuit enables the corresponding LED lamp to be turned on or off according to the oxygen concentration of the detection device, so that the current oxygen concentration condition is reflected.
The first ultrasonic sensor and the second ultrasonic sensor are integrated in a transceiving mode, and can convert electric energy into mechanical energy, namely transmit ultrasonic waves; or receive ultrasonic waves to convert mechanical energy into electrical energy.
The temperature sensor is an NTC type thermistor for indicating a change in temperature, and the resistance value is lower as the temperature is higher.
Furthermore, the microcontroller and the peripheral circuit thereof adopt an STM32F0 singlechip based on an ARM Cortex-M0 kernel, and the microcontroller has the advantages of complete resources, simple structure, good peripheral expansibility and low cost. The device is used for acquiring the forward conduction time and the reverse conduction time of ultrasonic waves, calculating the gas temperature through ADC (analog to digital converter) acquisition, and calculating the oxygen concentration and the flow according to the acquired data; according to the data received by the UART communication protocol, sending a corresponding data instruction, such as an instrument number, and sending a data frame of a detection result at intervals; and through a PWM mode, the corresponding pins output corresponding analog voltages according to the oxygen concentration and the oxygen flow of the detection device.
The data frame format of the UART communication protocol is as follows:
1. a start character as a header portion of the data frame indicating a sender of the data frame, such as the present detection apparatus;
2. length, used for expressing the length of byte of the data frame, including data and order number;
3. a command number for indicating the type of information, i.e., the function of this frame data;
4. data, which is used for representing specific data of information and can comprise n bytes of data;
5. and the check bit is obtained by summing the data before the check bit and subtracting the data sum by 256, and is used for judging whether the received data frame has errors or not and ensuring the accuracy of the data frame.
All information of the basic format of the data frame adopts the data type of an unsigned single-byte integer variable and is embodied in a 16-system format.
The utility model discloses an ultrasonic wave oxygen detection device's testing process includes following step:
Step 5, receiving reverse ultrasonic waves: after receiving the signal, the first ultrasonic sensor converts the mechanical energy into electric energy, and the electric energy is amplified by the operational amplifier through the switching network, and is transmitted to the microcontroller after being filtered. And after receiving the signal, the microcontroller calculates the reverse conduction time of the ultrasonic wave according to the count value of the timer.
Step 6, calculating the gas temperature: the microcontroller collects the voltage corresponding to the thermistor through an ADC of the microcontroller, calculates the resistance value of the thermistor, and calculates the current temperature of the gas according to a relation table of the resistance value and the temperature of the thermistor.
And 7, calculating the oxygen concentration and flow: and calculating the current oxygen concentration and flow of the detection device according to the data of the forward conduction time, the reverse conduction time and the gas temperature of the ultrasonic wave and by combining the relational expression of the oxygen concentration and the flow. The microcontroller sends a data frame of the detection result through USART, and sends a corresponding data instruction, such as an instrument number, according to the received data; through PWM of the microcontroller, the corresponding pins of the microcontroller output corresponding analog voltages according to the oxygen concentration and the oxygen flow of the detection device, and corresponding LED indication is made.
And finally, repeating the step 2 to the step 7, so that the ultrasonic oxygen detection device detects the oxygen concentration and the oxygen flow on line, and updating the detection result in time.
The calculation of the gas temperature is achieved by an analog-to-digital converter (ADC) and a thermistor of the microcontroller.
The forward or reverse ultrasonic wave is transmitted through 6 pulse excitation signals of 25us sent by a microcontroller, and is directly transmitted to an ultrasonic sensor, and the ultrasonic sensor converts the signals into mechanical energy so as to transmit the ultrasonic waves.
The forward or reverse ultrasonic wave receiving is that after the ultrasonic sensor receives a signal, mechanical energy is converted into electric energy, the electric energy is amplified after a network is switched, and then the electric energy is transmitted to the microcontroller after being filtered, so that the ultrasonic wave receiving is completed once.
The utility model provides an ultrasonic oxygen detection device, which uses a microcontroller to control a first ultrasonic sensor and a second ultrasonic sensor to transmit ultrasonic waves or receive ultrasonic waves in sequence, and obtains the forward conduction time and the reverse conduction time of the ultrasonic waves; the gas temperature is obtained by a thermistor. And calculating the current oxygen concentration and flow of the detection device according to the relation between the oxygen concentration and the flow. The utility model provides a safety problem that traditional detection method exists, the process that oxygen detected is simple and easy convenient, has small in size, and the reaction is rapid, the degree of accuracy is high, characteristics such as development cycle is short.
Drawings
FIG. 1 is a diagram of an ultrasonic oxygen sensor according to the present embodiment;
FIG. 2 is a hardware configuration diagram of the ultrasonic oxygen detection device according to the present embodiment;
FIG. 3 is a flowchart illustrating the operation of the ultrasonic oxygen detecting device according to the present embodiment;
FIG. 4 is a diagram of a power supply system of the ultrasonic oxygen detecting device according to the present embodiment;
FIG. 5 is a data frame format diagram of the ultrasonic oxygen detection device of the present embodiment;
wherein: 1-a first ultrasonic sensor, 2-a lumen, 3-an integral hardware circuit board, 4-a second ultrasonic sensor.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.
An ultrasonic oxygen detection device as shown in fig. 1 and 2 comprises a first ultrasonic sensor 1, a tube cavity 2, integral hardware 3 and a second ultrasonic sensor 4; the first ultrasonic sensor 1 is connected with the second ultrasonic sensor 4 through the lumen 2 and is used for transmitting ultrasonic waves emitted by the ultrasonic sensors; the whole hardware circuit board 3 comprises a power supply circuit, a microcontroller and peripheral circuits thereof, a detection circuit and an LED indicating circuit.
Further, the microcontroller, the peripheral circuit thereof, the detection circuit and the LED indicating circuit are all connected with the power circuit; the microcontroller and the peripheral circuit thereof, the sensor and the detection circuit are connected in sequence; the LED indicating circuit is connected with the microcontroller and peripheral circuits thereof; the LED indicating circuit mainly comprises a plurality of light emitting diodes which are respectively connected with pins of the microcontroller.
Furthermore, the detection circuit comprises an echo detection circuit and a temperature detection circuit which are connected with the microcontroller and peripheral circuits thereof; the echo detection circuit mainly comprises a first TLV272 chip, a second TLV272 chip and an SN74LVC1G3157 chip, wherein the first TLV272 chip, the SN74LVC1G3157 chip and the second TLV272 chip are connected in sequence; the temperature detection circuit mainly comprises a TLV272 chip.
Further, the sensors include a first ultrasonic sensor 1, a second ultrasonic sensor 4 and a temperature sensor; first ultrasonic sensor 1 passes through lumen 2 and is connected with second ultrasonic sensor 4, and first ultrasonic sensor 1, second ultrasonic sensor 4 all are connected with echo detection circuit simultaneously, and temperature sensor is connected with temperature detection circuit.
The power supply circuit comprises a 5.0V voltage stabilizing module and a 3.3V voltage stabilizing module, and the 5.0V voltage stabilizing module is connected with the 3.3V voltage stabilizing module; the 3.3V voltage stabilizing module supplies power to the microcontroller and peripheral circuits, the detection circuit and the LED indicating circuit thereof; the 5.0V voltage stabilizing module is connected with an external 12V direct current power supply.
The 5.0V voltage stabilizing module is an ASM117 power supply module; the 3.3V voltage stabilizing module is a TLV7023 power supply module.
As shown in fig. 4, the power circuit uses an external 12V dc power supply as an input terminal of the circuit, the 12.0V outputs 5.0V through the ASM117 power module, and the working voltage of 3.3V is provided through the TLV7023 power module, so as to supply power to the microcontroller and its peripheral circuits, the detection circuit, and the LED indication circuit.
The detection circuit comprises an echo detection circuit and a temperature detection circuit. The echo detection circuit receives the voltage signal converted by the ultrasonic sensor through the switching network, amplifies the voltage signal through the operational amplifier, and transmits the amplified voltage signal to the microcontroller after filtering processing. The temperature detection circuit takes an NTC type thermistor as a core and transmits voltage corresponding to the resistance value of the thermistor to the microcontroller.
And the LED indicating circuit enables the corresponding LED lamp to be turned on or off according to the oxygen concentration of the detection device, so that the current oxygen concentration condition is reflected.
The ultrasonic sensor is integrated with a transceiver, and can convert electric energy into mechanical energy, namely, transmit ultrasonic waves; or receive ultrasonic waves to convert mechanical energy into electrical energy.
The temperature sensor is an NTC type thermistor, and the resistance value is lower as the temperature is higher.
Furthermore, the microcontroller and the peripheral circuit thereof adopt an STM32F0 singlechip based on an ARM Cortex-M0 kernel, and the microcontroller has the advantages of complete resources, simple structure, good peripheral expansibility and low cost. The device is used for acquiring the forward conduction time and the reverse conduction time of ultrasonic waves, calculating the gas temperature through ADC (analog to digital converter) acquisition, and calculating the oxygen concentration and the flow according to the acquired data; according to the data received by the UART communication protocol, sending a corresponding data instruction, such as an instrument number, and sending a data frame of a detection result at intervals (the time of the embodiment is 1 second); and in a PWM (pulse Width modulation) mode, the corresponding pins output corresponding analog voltages according to the oxygen concentration and the oxygen flow of the detection device.
As shown in fig. 5, the format of one frame of data of the UART communication protocol is as follows:
6. a start character as a header portion of the data frame indicating a sender of the data frame, such as the present detection apparatus;
7. length, used for expressing the length of byte of the data frame, including data and order number;
8. a command number for indicating the type of information, i.e., the function of this frame data;
9. data, which is used for representing specific data of information and can comprise n bytes of data;
10. the check bit is obtained by summing the data before the check bit and subtracting the sum by 256, and is used for judging whether the received data frame has errors or not and ensuring the accuracy of the data frame;
all information of the basic format of the data frame adopts the data type of an unsigned single-byte integer variable and is embodied in a 16-system format.
As shown in fig. 3, the detection process of the ultrasonic oxygen detection device of the present embodiment includes the following steps:
The calculation formula of the forward conduction time of the ultrasonic wave is as follows:
wherein, TfRepresents the forward transit time of the ultrasonic wave in us, CNTfIndicates the count value, T, of the first timer during forward conduction of the ultrasonic wavefrRepresents the time error in us when the ultrasonic wave is propagating in the forward direction.
Step 5, receiving reverse ultrasonic waves: after receiving the signal, the first ultrasonic sensor 1 converts the mechanical energy into electric energy, and the electric energy is amplified by an operational amplifier of the echo detection circuit through a switching network, and is transmitted to the microcontroller after being filtered. And after receiving the signal, the microcontroller calculates the reverse conduction time of the ultrasonic wave according to the count value of the first timer.
The formula for calculating the reverse conduction time of the ultrasonic wave is as follows:
wherein, TrRepresents the reverse conduction time of the ultrasonic wave in us, CNTrThe count value T of the first timer during the reverse conduction of the ultrasonic waverrWhich represents the time error in us when the ultrasonic waves are propagating in the reverse direction.
Step 6, calculating the gas temperature: the microcontroller collects the voltage corresponding to the thermistor in the temperature detection circuit through an ADC of the microcontroller, calculates the resistance value of the thermistor, and calculates the current temperature of the gas according to a relation table of the resistance value of the thermistor and the temperature.
The resistance value of the thermistor is calculated according to the following formula:
wherein, Digital represents the Digital quantity collected by the microcontroller through ADC, V represents the voltage value corresponding to the thermistor, and the unit is mV, RfThe reference value of the thermistor (10 k Ω is used in this embodiment) is represented by Ω, and R represents the resistance value of the thermistor and is represented by Ω.
And 7, calculating the oxygen concentration and flow: and calculating the current oxygen concentration and flow of the detection device according to the data of the forward conduction time, the reverse conduction time and the gas temperature of the ultrasonic wave and by combining the relational expression of the oxygen concentration and the flow. The microcontroller sends a data frame of the detection result through USART, and sends a corresponding data instruction, such as an instrument number, according to the received data; through PWM of the microcontroller, the corresponding pins of the microcontroller output corresponding analog voltages according to the oxygen concentration and the oxygen flow of the detection device, and corresponding LED indication is made.
The oxygen concentration is calculated as follows:
Ts＝Tf+Tr
wherein, TfRepresents the forward transit time of the ultrasonic wave in us, TrRepresents the reverse transit time of the ultrasonic wave in us, TsRepresents the sum of the forward conduction time and the reverse conduction time of the ultrasonic wave in us, T represents the gas temperature in C00、C10、C01、C20、C11、C02、C03Respective constants, C, representing calculations of oxygen concentration by the ultrasonic oxygen detecting apparatus00＝-1543,C10＝10.09,C01＝-34.07,C20＝-0.002261,C11＝-0.2537,C02＝4.836,C03C represents the current oxygen concentration in% 0.
The calculation formula of the oxygen flow is as follows:
Te＝Tr-Tf
Q＝Q00+Q10*Te+Q20*Te 2
wherein, TfRepresents the forward transit time of the ultrasonic wave in us, TrRepresents the reverse transit time of the ultrasonic wave in us, TeRepresents the difference between the reverse conduction time and the forward conduction time of the ultrasonic wave, and the unit is us and Q00、Q10、Q20Respective constants, Q, representing calculations of the ultrasonic oxygen detecting device with respect to the oxygen flow rate00＝0.04157,Q10＝-17.59,Q201862, Q represents the current oxygen flow rate in L/min.
The microcontroller calculates the analog voltage output by the pin according to the oxygen concentration and the oxygen flow of the detection device according to the following formula:
wherein C represents the current oxygen concentration in%, VCThe analog voltage corresponding to the oxygen concentration is represented by V, Q represents the current oxygen flow rate and is represented by L/min and VQThe analog voltage output corresponding to the oxygen concentration is shown in V.
And finally, repeating the step 2 to the step 7, so that the ultrasonic oxygen detection device detects the oxygen concentration and the oxygen flow on line, and updating the detection result in time.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (8)
1. An ultrasonic oxygen detection device is characterized by comprising a power supply circuit, a microcontroller and peripheral circuits thereof, a sensor, a detection circuit and an LED indicating circuit; the microcontroller, the peripheral circuit thereof, the detection circuit and the LED indicating circuit are all connected with the power circuit; the microcontroller and the peripheral circuit thereof, the sensor and the detection circuit are connected in sequence; the LED indicating circuit is connected with the microcontroller and peripheral circuits thereof.
2. The ultrasonic oxygen detection device of claim 1 wherein the LED indicator circuit is comprised of a plurality of LEDs, each of the plurality of LEDs being connected to a pin of the microcontroller.
3. The ultrasonic oxygen detection device according to claim 1, wherein the detection circuit comprises an echo detection circuit and a temperature detection circuit, both of which are connected with the microcontroller and its peripheral circuits; the echo detection circuit mainly comprises a first TLV272 chip, a second TLV272 chip and an SN74LVC1G3157 chip, wherein the first TLV272 chip, the SN74LVC1G3157 chip and the second TLV272 chip are connected in sequence; the temperature detection circuit mainly comprises a TLV272 chip.
4. The ultrasonic oxygen detection device of claim 1, wherein the sensor comprises a first ultrasonic sensor, a second ultrasonic sensor, and a temperature sensor; first ultrasonic sensor, second ultrasonic sensor interconnect, first ultrasonic sensor, second ultrasonic sensor all are connected with echo detection circuitry simultaneously, and temperature sensor and temperature detection circuitry are connected.
5. The ultrasonic oxygen detection device according to claim 1, wherein the power circuit comprises a 5.0V voltage regulation module and a 3.3V voltage regulation module, and the 5.0V voltage regulation module is connected with the 3.3V voltage regulation module; the 3.3V voltage stabilizing module supplies power to the microcontroller and peripheral circuits, the detection circuit and the LED indicating circuit thereof; the 5.0V voltage stabilizing module is connected with a 12V direct current power supply.
6. The ultrasonic oxygen detection device according to claim 5, wherein the 5.0V voltage stabilization module is an ASM117 power supply module.
7. The ultrasonic oxygen detection device according to claim 5, wherein the 3.3V voltage-stabilizing module is a TLV7023 power supply module.
8. The ultrasonic oxygen detection device of claim 1, wherein the microcontroller and its peripheral circuits employ an STM32F0 single chip microcomputer based on an ARM Cortex-M0 kernel.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113063467A (en) * | 2021-04-28 | 2021-07-02 | 哈勃智能传感(深圳)有限公司 | Sensor-based oxygen concentration and effective flow measuring method and storage medium |
| CN113155208A (en) * | 2021-05-25 | 2021-07-23 | 中国航发四川燃气涡轮研究院 | Gas flow detection device suitable for turbine blade |
-
2019
- 2019-09-09 CN CN201921497560.7U patent/CN211955317U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113063467A (en) * | 2021-04-28 | 2021-07-02 | 哈勃智能传感(深圳)有限公司 | Sensor-based oxygen concentration and effective flow measuring method and storage medium |
| CN113155208A (en) * | 2021-05-25 | 2021-07-23 | 中国航发四川燃气涡轮研究院 | Gas flow detection device suitable for turbine blade |
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