JPS62267898A - Remote signal transmitter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a remote signal transmission device that can receive detection information of a physical quantity or a chemical quantity of an object to be measured at a remote location by providing a source in a sensor section. .

(Traditional trick) Traditionally, things such as temperature and pressure of the object to be measured are FI! In order to detect chemical quantities such as gases, ions, etc. at a remote location, a sensor is installed close to the object to be measured, and a transmitter unit No. 13 and this Shintan transmitter convert the detection information of the sensor into an electrical signal. A main body electrically connected to the receiver was provided on the receiving side.

In this case, signals are exchanged between the sensor section and the main body section using electrical signals, which is vulnerable to external power supply noise. As a countermeasure against this problem, a system is known in which signals are exchanged between the sensor section and the main body section using optical signals using an optical fiber.

(Problems to be Solved by the Invention) Incidentally, such a remote signal transmission device requires a power source for the sensor section. As a result, the sensor section is bulky and large, and this section is susceptible to electrical disturbance noise.Furthermore, it is also possible to use a battery as a simple means for powering the sensor section. However, in this case, there was a problem in that the battery had to be replaced depending on the usage conditions, making maintenance troublesome.

The present invention has been made in view of the above-mentioned problems, and has a simple configuration that reduces parts and size, facilitates maintenance, and reduces power consumption. Distant Sui Shing transmission that is difficult to receive! The purpose is to provide an A-neck.

(1st stage for solving the problem) In order to achieve the above object, the present invention provides an object L to be measured.
! ! A sensor unit 9 that detects ffl or chemical vapor, and a sensor unit that is connected to this sensor unit via a guiding wave path to control and control the sensor unit.
The main body section is equipped with a light source section that supplies light to the sensor section, and a light receiving section that receives an optical signal sent from the sensor section and converts it into electricity. ° part is the object to be measured 1! I! A sensor that detects ffl or a chemical quantity, a photoelectric conversion unit that converts light supplied from the main body into electricity, and a physical quantity or chemical quantity of the object to be measured detected by the sensor using the electrical quantity of the photoelectric conversion unit. A signal converter converts the light into an electrical signal, inputs light from the main body, and is driven and controlled by the electrical signal formed by the signal converter to control on/off the light input from the main body to receive light from the main body. It is characterized by being equipped with an optical shutter A7 ivy that sends out to the section.

Note that the photoelectric conversion section may be configured to include a solar cell.

Further, the optical shifter A footer may be a transmissive liquid crystal or a reflective liquid crystal.

(Embodiment) FIG. 1 is a block diagram showing the configuration of a remote signal transmission device according to a first embodiment of the present invention, and FIG. 2 is a perspective view without showing its schematic configuration.

This remote signal transmission device includes a sensor section 1 that detects the temperature value of the object to be measured, and a main body section 3 that is connected to the sensor section 1 via an optical fiber 2 to control and manage the sensor section 1. There is. As shown in FIG. 2, the optical fiber 2 is connected to the sensor section 1 and the main body 3 by inserting plugs 15 provided at both ends thereof and forming an optical connector into the sockets 16 of the sensor section 1 and the main body 3, respectively. connected to section 3.

The main body part 3 includes a light source 31 that supplies light to the sensor part 1, a light receiving part 32 that receives an optical signal sent from the sensor part 1, and converts it into electricity; It has a signal processing section 33 that performs signal processing such as displaying based on the signal.

The optical fibers 2 include light supply optical fibers 21 . Optical fiber 22 for optical fiber input
and an optical shutter output optical fiber 23 connected to the light receiving section 32.

The sensor unit 1 includes a sensor 11 that detects the temperature of the object to be measured, a photoelectric conversion unit 12 that receives light from a light source 31 via a light supply optical fiber 21, and converts it into electricity, and the sensor 11.
a signal converter 13 that converts the detected humidity value into an amount of electricity 8 using electricity obtained by the photoelectric converter 12; and an optical screen 17.
The light source 31 takes in light via the optical fiber 22 for input, and is driven and controlled by the electric signal generated by the signal converter 13 to turn on and off the light received from the optical IQ 31. The optical shutter 14 sends out the light to the light receiving section 32 via the optical fiber 23 for the optical shutter exit horn.
It is equipped with

The operation of the remote signal transmission device configured as above will be explained.

First, the light source 31 emits light and this light is supplied to the photoelectric conversion section 12 and the optical shutter 14.

Therefore, the photoelectric conversion section 12 generates an electric signal according to the received light 1''H, and sends this to the signal conversion section 13. On the other hand, the optical shutter 14 is normally in a "closed" state, and the light supplied to the optical shutter 14 is cut off here. At this stage, the light is received via the optical shutter output optical fiber 23. It has not been sent to section 32.

When the sensor 11 detects the temperature of the object to be measured in this state, the signal converter 13 converts the electrical signal generated by the photoelectric converter 12 into a pulsed electrical signal having a frequency corresponding to the temperature value of the object to be measured. (sensor electrical signal). In response to the ON signal of this sensor electrical signal, the optical shutter 1
4 opens, and the light receiving unit 32 receives the light from the light source 31.
Send to. The light receiving section 32 converts light input at a predetermined period into an electrical signal. This electrical signal corresponds to the temperature value of the object to be measured detected by the sensor 11. Then, the signal processing unit 33 displays this electrical signal on a display (not shown).
Process the signal so that it is displayed.

In this embodiment, the sensor 11 detects the temperature value of the object to be measured, but the present invention is not limited to this. 'l! It is also applied when detecting chemical I such as M or gas.

Further, in this embodiment, the optical shutter 14 is always in the "closed" state, but it may be always in the "open" state.

Further, in this embodiment, the signal converter 13 forms a pulsed electric signal q having a frequency corresponding to the temperature value detected by the sensor 11, and the optical shutter 14 is activated in response to the pulse of this electric signal.
The case has been described in which the optical signal is sent as a digital signal to the light receiving section 32. However, the signal converting section 13 forms an electrical signal of an analog quantity (for example, voltage amplitude) corresponding to the temperature value detected by the sensor 11, and this The opening degree of the optical shutter 14 is adjusted according to the analog amount of the electrical signal, and the light received from the light source 31 is converted into an analog signal via the optical shutter 14.

Alternatively, the signal may be sent to the light receiving section 32 as a signal.

FIG. 3 is a block diagram showing the configuration of a remote signal transmission device according to a second embodiment of the present invention.

This remote signal transmission device includes a sensor section 4 that detects the temperature value of the object to be measured, and a main body section 6 that is connected to the sensor section 4 via an optical fiber 5 and that controls and manages the sensor section 4. .

The main body section 6 includes a light source 61 that supplies light to the sensor section 4, a light receiving section 62 that receives an optical signal sent from the sensor section 4 and converts it into electricity, and an electrical signal generated by the light receiving section 62. a signal processing unit 63 that performs signal processing to perform display etc. based on the data and sends out a synchronization signal q;
It has a synchronization signal sending section 64 that converts the synchronization signal sent out into an optical signal and sends it to the sensor section 4.

The light receiving section 62 has a phototransistor 621 that responds to light input via the liquid crystal shutter output optical fiber 53. Further, the synchronization signal sending section 64 includes a light emitting diode (LED) 641 and a transistor 642, and the transistor 642 receives the synchronization signal from the signal processing section 63.
The LED 641 is turned on and off in response to this synchronization signal, and this ON operation causes the LED 641 to emit light, and a synchronized optical signal is sent from the LED 641 to the synchronization signal receiving section 43 of the sensor section 4.

The optical fiber 5 leaks through a light source optical fiber 51 that transmits light from a light source 61. The light source optical fiber 51t is branched midway to form first and second light source optical fibers 511 and 512, and the first light source optical fiber 511 is connected to the sensor unit 4.
In addition, a second light source optical fiber 5 is connected to the solar cell 421 of
12 is connected to the liquid crystal shutter 44 of the sensor section 4. Furthermore, the optical fiber 5 includes a synchronization signal optical fiber 52 that transmits the light of the LED 641 to the synchronization signal reception section 43;
A liquid crystal shutter output optical fiber 53 is provided between the liquid crystal shutter 44 and the light receiving section 62.

The sensor unit 4 includes a sensor 41 that detects the temperature of the object to be measured.
, a photoelectric conversion section 42 that receives light from the light source 61 via the second light source optical fiber 512 and converts it into electricity, and a photoelectric conversion section 42 that receives light from the synchronization signal sending section 64 via the synchronization signal optical fiber 52. Phototransistor 431 that converts this into electricity
l1liIi who did it right! 11 signal receiving section 43, a transmissive liquid crystal shutter 44 interposed between the first light source optical fiber 511 and the liquid crystal shutter output optical fiber 53 and driven by the output signal of the sensor 41, and the sensor 41. Photoelectric converter 42° synchronization signal receiver 43. Transmissive liquid crystal display 4
4 are connected to each other under predetermined conditions, and an LSI 45 is provided for transmitting and receiving signals between them.

The photoelectric conversion unit 42 includes a solar cell 421 that receives light from a light source 61.
and a capacitor 422 connected in parallel to the solar cell 421 to keep the voltage obtained by the solar cell 421 constant and having one end grounded.

The collector of the phototransistor 431 of the synchronization signal receiving section 43 is connected to the repulsion side terminal of the capacitor 422 via a resistor 432, and a voltage is applied to it, and the phototransistor 431 is turned on and off by the light emitted by the LED 641. The synchronized electrical signal is transmitted to the phototransistor 43.
The signal is output from the collector section of No. 1 to the LSI 45.

The sensor 41 includes a thermistor 411, a reference resistor 412 connected in parallel to the thermistor 411, and a capacitor 413 connected in series to the thermistor 411 and the base resistor 412.
It is equipped with The base resistor 412 and the thermistor 411 are switched and used by l-8145.

Then, 44 is connected to either one of the two and the capacitor 413.
A terminal voltage of the capacitor 422 is applied to form an RCC generator circuit. A pulse signal with a frequency corresponding to this oscillation frequency is formed from the synchronization signal of the synchronization signal receiving section 43 by, for example, an AND circuit included in the LSI 45, and this signal is supplied as serial data to the liquid crystal shutter 44. ing.

In the remote signal transmission device configured as described above, first,
Reference resistor 412, capacitor 413 and capacitor 422
A terminal voltage of is applied to create an oscillation frequency according to the resistance value of the reference resistor 412.

A pulse signal 8 with a frequency corresponding to this oscillation frequency is transmitted to the LSI based on the synchronization signal input from the synchronization signal receiving section 43.
45 and the liquid crystal shutter 4 as serial data.
4. The liquid crystal shutter 44 is driven to open and close according to the serial data. Then, the optical signal whose number of changes corresponds to the reference resistor 412 is transmitted to the light receiving section 62 via the liquid crystal shutter output optical fiber 53. The light receiving section 62 converts this signal into an electrical signal, and then sends the electrical signal to a signal processing section 63, where signal processing such as display processing on a display (not shown) is performed. Then, each part of this device is calibrated based on the following operations based on the resistance value of the reference resistor 412 at the temperature.

Next, when measuring the temperature of the object to be measured, the thermistor 411 is brought close to the object to be measured. Then, circuit switching is performed in the LSI 45, and the terminal voltage of the capacitor 422 is applied to the thermistor 411 and the capacitor 413.

Then, a signal having the number of pulses corresponding to the oscillation frequency at this time is generated by the LSI 45 based on the synchronization signal inputted from the synchronization signal receiving section 43, and is supplied to the liquid crystal shutter 44 as a serial data.

The liquid crystal shutter 44 opens and closes in accordance with the serial data. Then, an optical signal whose number of changes corresponds to the resistance value of the thermistor 411 is transmitted to the liquid crystal screen A7 output optical fiber 53.
It is transmitted to the light receiving section 62 via. The light receiving section 62 converts this optical signal into an electrical signal and sends it to the signal processing section 63. Here, a signal processing section for displaying on a Teddisplay (not shown) is performed.

Although not explained in the above-mentioned second example, for example, a reflective liquid crystal shutter may be provided in place of the transmissive liquid crystal shutter 44, and the light F may be transmitted through the first light source optical fiber 511. , i61 may be reflected by this reflective liquid crystal shutter, and this reflected light may be received by the liquid crystal A footer output optical fiber 53'C.

In addition, in this embodiment, a digital signal (No. 8) formed by avoiding changes in the time ratio of light passing through a shield is used as a signal to be transmitted from the LSI/15 to the main body 61, and a case will be explained in which signal processing is performed using this. However, an analog signal may be formed by changing the light transmittance of the liquid crystal shutter in an analog manner, and the analog signal may be sent to the main body section 61 for signal processing.

FIG. 4 is a block diagram showing the configuration of a remote signal transmission device according to a third embodiment of the present invention. In the figure, the same members as those in the device shown in FIG. The display of some parts has been omitted.

In this remote signal transmission device, the first light source optical fiber 511 connected to the liquid crystal shutter 44 is further branched, and the sensor section 4 is provided with a liquid crystal shutter 71 connected to the branched first light source optical fiber 511. There is. A main body portion 6I is provided with respect to the liquid crystal shutter 71: a light receiving portion 72. An optical fiber 73 is disposed between the liquid crystal shutter 71 and the light receiving section 72. The light receiving section 72 is connected to the signal processing section 63. The liquid crystal shutter 71 turns on and off the optical signal according to the clock signal 01 output from the LS 145, and sends this to the light receiving section 72 as a synchronization signal. Based on this synchronization signal, the main body 6 synchronizes the signal processing of data sent from the liquid crystal shutter 44.

According to this embodiment, the main body part 6 can be made to have a simple structure and can be appropriately synchronized with the sensor part 4.

(Effects of the Invention) As explained above, the present invention transmits the measured quantity detected by the sensor unit as an optical signal to the main unit, and also uses the light sent from the main unit to control and drive the sensor unit. Because
The reduction in parts and the miniaturization of the device result in easy maintenance, resistance to electrical disturbance noise, and reduced power consumption.

[Brief explanation of drawings]

FIG. 1 is a ten-dimensional diagram showing the configuration of a remote signal transmission device according to a first embodiment of the present invention, FIG. 2 is a schematic perspective view without showing the configuration of the device, and FIG. FIG. 4 is a block diagram showing the configuration of the remote signal transmission device according to the third embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of a remote signal transmission device according to an embodiment of the present invention. 1.4...Sensor part, 2,5...Optical fiber, 3゜6...Body part, 11.41...Sensor, 12.42
... Photoelectric conversion section, 13... Signal conversion section, 14...
Optical Shack, 31,. 61...Light source, 32.62
...Light receiving section, 43...Signal receiving section, 44...
・Transmissive liquid crystal shutter, 45...LS11411...
- Thermistor, 412... Reference resistor, 413... Capacitor, 421... Solar cell.

Claims (4)

[Claims] (1) It has a sensor section that detects the physical quantity or chemical quantity of the object to be measured, and a main body section that is connected to the sensor section via an optical waveguide to control and manage the sensor section, and the main body section is the sensor section. The sensor includes a light source section that supplies light to the object, and a light receiving section that receives an optical signal sent from the sensor section and converts it into electricity. , a photoelectric conversion section that electrically converts light supplied from the main body, and a signal conversion section that converts a physical quantity or a chemical quantity of the object to be measured detected by the sensor into an electrical signal using the electrical quantity of the photoelectric conversion section. , an optical shutter that inputs light from the main body and is driven and controlled by an electric signal formed by a signal converter to control on/off the light input from the main body and send it to the light receiving section of the main body. A remote signal transmission device characterized by: (2) The remote signal transmission device according to claim 1, wherein the photoelectric conversion section includes a solar cell. (3) The remote signal transmission device according to claim 1 or 2, wherein the optical shutter is a transmissive liquid crystal. (4) The remote signal transmission device according to claim 1 or 2, wherein the optical shutter is a reflective liquid crystal.