CN2886578Y - Thermal anemometer - Google Patents
Thermal anemometer Download PDFInfo
- Publication number
- CN2886578Y CN2886578Y CN 200620012514 CN200620012514U CN2886578Y CN 2886578 Y CN2886578 Y CN 2886578Y CN 200620012514 CN200620012514 CN 200620012514 CN 200620012514 U CN200620012514 U CN 200620012514U CN 2886578 Y CN2886578 Y CN 2886578Y
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- electric bridge
- differential amplifier
- input end
- output
- formula wind
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Abstract
The utility model relates to a wind speed-detecting equipment, in specific to a calorimetric type anemometer designed utilizing the variation of the internal resistance of the resistance wire caused by the temperature shift. The utility model comprises an electric bridge composed of a positive temperature coefficient resistance heater and three resistances, the output of the electric bridge is connected to the input end of a differential amplifier whose output returns to the input end of the electric bridge, and a zero regulating circuit and a full scale regulating circuit are connected in order at the same time. The flow of the air or the gas can be measured through measuring the energy needed to keep the temperature of a resistance heater to be consistent, and needs no physical structure by utilizing the simulating electronic circuit to carry out the detecting, thereby the detection sensitivity is higher and the detecting result is more accurate.
Description
Technical field
The utility model relates to a kind of wind speed checkout equipment, is that a kind of resistance wire internal resistance that utilizes temperature variation to cause changes and the calorimetric formula wind gage of design specifically.
Background technology
Mostly existing wind gage is to adopt weathervane and vane that wind speed is detected, its dynamic performance index, comprise that the distance constant of wind transducer damping, air velocity transducer does not often reach the related request of World Meteorological Organization (WMO), and physical construction is comparatively complicated, and the detection sensitivity of structure and components and parts is had relatively high expectations.
The utility model content
The utility model has overcome above-mentioned shortcoming, and a kind of simple in structure, highly sensitive calorimetric formula wind gage is provided.
The technical scheme in the invention for solving the technical problem is: a kind of calorimetric formula wind gage, comprise resistive heater and three electric bridges that resistance constitutes by a positive temperature coefficient (PTC), the output of described electric bridge is connected to the input end of a differential amplifier, the output of described differential amplifier turns back to the input end of described electric bridge, also is connected with simultaneously zero adjustment circuit and full scale regulating circuit in turn.
The output of described differential amplifier and the input end of described electric bridge also can be connected with an amplification feedback circuit that is used to amplify described differential amplifier output.
Described amplification feedback circuit comprises can a triode.
The input end of described electric bridge can be connected to the forward power end through a resistance, one end of the resistive heater of wherein said positive temperature coefficient (PTC) is as an output terminal of electric bridge, link to each other with the reverse input end of described differential amplifier, other end ground connection, another output terminal of described electric bridge is connected to the input end in the same way of described differential amplifier.
In the described amplification feedback circuit, the base stage of described triode can link to each other with the output of described differential amplifier through an isolation resistance, and connect the forward power supply through a filter capacitor simultaneously, collector directly connects the forward power supply, emitter is connected to the input end of described electric bridge, outputs to described zero adjustment circuit through behind another isolation resistance simultaneously.
Triode in the described amplification feedback circuit can be NPN type Darlington transistor.
The electric bridge value of described electric bridge can be 20～2000 Ω.
Also can be connected with an electric capacity negative feedback between the output terminal of described differential amplifier and the inverting input.
The utility model comprises by the resistive heater of a positive temperature coefficient (PTC) and three electric bridges that resistance constitutes, the output of described electric bridge is connected to the input end of a differential amplifier, the output of described differential amplifier turns back to the input end of described electric bridge, also is connected with simultaneously zero adjustment circuit and full scale regulating circuit in turn.Can keep a constant required energy of resistive heater temperature constant by measuring, measure the flow of air or gas thus,, need not physical construction and participate in owing to adopted Analogical Electronics to realize detecting, make detection sensitivity higher, testing result is more accurate.
Description of drawings
Fig. 1 is the utility model power principle figure
Embodiment
As shown in Figure 1, the utility model comprises by the resistive heater L of a positive temperature coefficient (PTC) and three electric bridges that resistance R 1, R2, R3 constitute, the output of described electric bridge is connected to the input end of a differential amplifier A 1, and the output of described differential amplifier A 1 and the input end of described electric bridge also are connected with an amplification feedback circuit that is used to amplify described differential amplifier A 1 output.The input end of described electric bridge is connected to the forward power end through a resistance R 6, the end of the resistive heater L of wherein said positive temperature coefficient (PTC) is as an output terminal of electric bridge, link to each other with the reverse input end of described differential amplifier A 1, other end ground connection, another output terminal of described electric bridge is connected to the input end in the same way of described differential amplifier.Described amplification feedback circuit is mainly by the amplification of a NPN type Darlington triode Q1 realization to differential amplifier A 1 output signal, the base stage of described triode Q1 links to each other with the output of described differential amplifier A 1 through an isolation resistance R4, and connect the forward power supply through a filter capacitor C1 simultaneously, collector directly connects the forward power supply, emitter is connected to the input end of described electric bridge, after passing through another isolation resistance R5 simultaneously, connect zero adjustment circuit I and full scale regulating circuit II in turn as output.Also be connected with a capacitor C 2 between the output terminal of described differential amplifier A 1 and the inverting input as negative feedback, make the output of differential amplifier A 1 more steady.Described zero adjustment circuit I and full scale regulating circuit II are prior art, and can adopt multiple circuit structure to realize, are not giving unnecessary details here.
The utility model is measured the flow of air or gas thus by to keeping a constant required energy of resistive heater temperature constant to measure.The concrete course of work is: a miniature bulb has positive temperature coefficient, therefore be a kind of good sensor, for example adopt one 328 type bulb, filament after the glass shell with it removes (being the resistive heater L of described positive temperature coefficient (PTC)), put into the bridge diagram that is subjected to differential amplifier A 1 monitoring, the output current signal of described differential amplifier A 1 amplifies through triode Q1, feed back and drive described bridge diagram again, when adding power supply, described filament L is in low resistance state, and the emitter of described triode Q1 is tending towards complete conducting.When electric current flow through filament L, the temperature of filament rose rapidly, and the resistance of filament is increased, and this variation has increased the anti-phase input current potential of differential amplifier A 1.So the emitter voltage of described triode Q1 descends, circuit is in a stable working point.In order to keep bridge balance, described differential amplifier A 1 works, and the resistance of lamp is descended, thereby make the temperature constant of filament constant.We select the electric bridge value of 20～2000 Ω for use, so that described filament is worked under the temperature that is lower than incandescent spot slightly.
Before using the utility model, at first to be placed on filament in the air-flow, its filament and air-flow are met at right angles.Secondly, turn-off air-flow or make lamp and the air-flow isolation, regulate zero flow potentiometer RL1 then, make circuit be output as 0V.Then, lamp is in the air-flow of 1000 feet per minutes, fine setting full scale flow potentiometer RL2 makes circuit be output as 10V.Carry out above-mentioned adjusting repeatedly, till two kinds of circuit outputs immobilize.Finish after the aforesaid operations process, the utility model just can be exported the magnitude of voltage of 0～10V in the flow rates of whole 0～1000 feet per minute, thereby realizes that accurate wind speed detects, and can reach+3%～-3% precision.
More than calorimetric formula wind gage provided by the utility model is described in detail, used specific case herein principle of the present utility model and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (8)
1. calorimetric formula wind gage, it is characterized in that: comprise resistive heater and three electric bridges that resistance constitutes by a positive temperature coefficient (PTC), the output of described electric bridge is connected to the input end of a differential amplifier, the output of described differential amplifier turns back to the input end of described electric bridge, also is connected with simultaneously zero adjustment circuit and full scale regulating circuit in turn.
2. calorimetric formula wind gage according to claim 1 is characterized in that: the output of described differential amplifier and the input end of described electric bridge also are connected with an amplification feedback circuit that is used to amplify described differential amplifier output.
3. calorimetric formula wind gage according to claim 2 is characterized in that: described amplification feedback circuit comprises a triode.
4. according to claim 1 or 2 or 3 described calorimetric formula wind gages, it is characterized in that: the input end of described electric bridge is connected to the forward power end through a resistance, one end of the resistive heater of wherein said positive temperature coefficient (PTC) is as an output terminal of electric bridge, link to each other with the reverse input end of described differential amplifier, other end ground connection, another output terminal of described electric bridge is connected to the input end in the same way of described differential amplifier.
5. calorimetric formula wind gage according to claim 3, it is characterized in that: in the described amplification feedback circuit, the base stage of described triode links to each other with the output of described differential amplifier through an isolation resistance, and connect the forward power supply through a filter capacitor simultaneously, collector directly connects the forward power supply, emitter is connected to the input end of described electric bridge, outputs to described zero adjustment circuit through behind another isolation resistance simultaneously.
6. according to claim 3 or 5 described calorimetric formula wind gages, it is characterized in that: the triode in the described amplification feedback circuit is a NPN type Darlington transistor.
7. calorimetric formula wind gage according to claim 4 is characterized in that: the electric bridge value of described electric bridge is 20～2000 Ω.
8. according to claim 1 or 2 or 3 described calorimetric formula wind gages, it is characterized in that: also be connected with an electric capacity negative feedback between the output terminal of described differential amplifier and the inverting input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620012514 CN2886578Y (en) | 2006-04-28 | 2006-04-28 | Thermal anemometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620012514 CN2886578Y (en) | 2006-04-28 | 2006-04-28 | Thermal anemometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2886578Y true CN2886578Y (en) | 2007-04-04 |
Family
ID=37961667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620012514 Expired - Fee Related CN2886578Y (en) | 2006-04-28 | 2006-04-28 | Thermal anemometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2886578Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105699687A (en) * | 2016-01-22 | 2016-06-22 | 北京至感传感器技术研究院有限公司 | Wind speed and direction detection device |
| CN107741507A (en) * | 2017-12-12 | 2018-02-27 | 湖南普信工程技术有限公司 | A kind of NTC airspeedometers |
| CN109986576A (en) * | 2019-04-16 | 2019-07-09 | 北京宸星控制技术有限公司 | A kind of intelligent hotel service robot |
-
2006
- 2006-04-28 CN CN 200620012514 patent/CN2886578Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105699687A (en) * | 2016-01-22 | 2016-06-22 | 北京至感传感器技术研究院有限公司 | Wind speed and direction detection device |
| CN107741507A (en) * | 2017-12-12 | 2018-02-27 | 湖南普信工程技术有限公司 | A kind of NTC airspeedometers |
| CN109986576A (en) * | 2019-04-16 | 2019-07-09 | 北京宸星控制技术有限公司 | A kind of intelligent hotel service robot |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070404 |