JPS59122247A - Transmitting device of optical information - Google Patents

Abstract

PURPOSE:To prolong the life of a battery and to simplify the maintenance or the like by using a reinforcing line reinforcing the strength of an optical fiber cable to supply electric energy to a detecting system or the like. CONSTITUTION:In an energy feeding circuit 25 of a receiving system 20, prescribed voltage is outputted between both the ends of the secondary winding of a transformer 22 from a commercial power supply 21 through the transformer 22. One end of the secondary winding is earthed and an output voltage appearing on the other end of the secondary winding is applied with half-wave rectification by a rectifier element 23 and then the half-wave rectified voltage is supplied to one end of a reinforcing line 31 in the optical fiber cable 30. The other end of the reinforcing line 31 is connected to an electric energy supplying circuit 16 in a detecting system 10 to supply electric energy to the detecting system 10.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an original information transmission device that transmits optical/Grus signals corresponding to temperature, pressure, etc. using a source fiber, and particularly relates to This invention relates to an original information transmission device with an improved means of supplying electrical energy to a detection system, etc.

[Technical background of the invention and its problems]

Measurement systems using optical fibers have the advantage of being immune to electrical noise and electrical surges such as those caused by lightning, and are easy to construct into intrinsically safe explosion-proof detection systems in chemical factories and the like. In addition, the cost of cables can be reduced, so there are high expectations for the future.

By the way, when measuring physical quantities such as temperature and pressure, as well as chemical mysteries, it is possible to do so without using electrical energy at all, but at present there are problems with accuracy, the effects of ambient temperature, etc.
There are many difficult problems in terms of measurement range, etc. In any case,
The merits of the measurement system can be fully obtained by detecting temperature, pressure, etc. using conventional measurement techniques, converting the signals into original pulse signals, and transmitting the signals through the original fiber couple. For example, in temperature measurement, if a resistance temperature detector is used to convert resistance changes due to temperature changes into an electrical signal, and this signal can be modulated in pulse width and frequency, signal processing on the receiving side will be simple and highly accurate. You can also get

Conventionally, there have been two sources of electrical energy for the detection system, one of which is as shown in FIG. A sensor 3 using a battery 2, a measurement circuit 4 that converts the output of the sensor 3 into a required signal, and an optical signal converter 6 that converts an electrical signal into a light/Grus signal and introduces it into an optical fiber cable 5, respectively. It supplies power. The other method is to emit light from the injured system side (not shown) using a laser diode 7, etc., and send this light (N.
The solar cell 9 is activated by guiding the solar cell 9 to the solar cell 9, and the power from the large pond 9 is supplied to the functional circuit 3.4.6.

However, in the case of using the battery 2 as shown in Fig. 1, there are problems in terms of the battery life and maintenance, and in the case of the case of Fig. However, the large ISW and pond 9 themselves still have problems in terms of light-to-electrical conversion efficiency.

[Purpose of the invention]

An object of the present invention is to provide an optical information transmission device 4 that can supply electrical energy to a detection system without providing a special cable, thereby causing no problems in terms of life and maintenance, and being advantageous in terms of cost. be.

[Summary of the invention]

The present invention is an optical information transmission device in which electrical energy is supplied to a detection system and the like using a reinforcing wire made of, for example, iron or aluminum to reinforce the strength of an optical fiber cable.

[Embodiments of the invention]

FIG. 3 is a diagram showing a first embodiment of the present invention apparatus for modulating the resistance value of a temperature-measuring resistor into original information.

In FIG. 3, 10 is a detection system that converts the temperature detection signal into an original pulse signal and transmits it, 2° is a reception system that receives the light/radius signal from the detection system IO, and 30 is the detection system 10.
This is an optical fiber cable provided between the receiving system 20 and the receiving system 20. This detection system 1o1rJ1, resistance temperature detector 1 on the - side
Temperature measurement bridge with a 1. A p circuit 12, an amplifying circuit 13 which amplifies the output voltage of the temperature measuring bridge circuit 12 obtained by changing the resistance value of the temperature measuring resistor 1 according to temperature changes, and an amplifier circuit 13 which amplifies the output voltage of the temperature measuring bridge circuit 12, which is obtained by changing the resistance value of the temperature measuring resistor 1 according to temperature changes, and a voltage-to-frequency conversion circuit 14 that converts the voltage to a frequency, and a light-emitting element 15 that generates a source/base pulse signal according to the output frequency of the conversion circuit 14.
and a DC- supplying power to the functional circuits 12 to 15.
It consists of an electrical energy supply circuit 16 such as a DC converter. Electrical energy is supplied to the electrical energy supply circuit 16 using the following configuration. One! In the electric energy transmission circuit 25 of the reception system 2θ, a required voltage is outputted between the commercial power supply 2 and the secondary winding of the transformer 22 via the transformer 22. One end of this secondary winding is grounded, and the output voltage appearing at the other end of the secondary winding is half-wave rectified by the rectifying element 23 and then applied to one end of the reinforcing wire 3 of the original fiber cable 30. supply Normally, the optical fiber cable 30 uses a reinforcing wire 31 made of iron, aluminum, etc. to reinforce its own strength, so this reinforcing wire 31 is used as an electrical energy transmission line to make effective use of the reinforcing wire 31. be. Then, the other end of the reinforcing wire 31 is connected to the electric energy supply circuit 16 of the detection system 1θ.
The circuit 16 is connected to the circuit 16 and supplies electrical energy to the same circuit 16. It is assumed that this electrical energy supply circuit 16 is grounded. In the figure, 24 is an optical-electrical signal converter.

The power supplied to the detection system 10 may be about 50 mW, but this electrical energy is
The receiving system 20 is supplied between one end of the reinforcing wire 3 and the ground, for example, by rectifying the commercial power supply 21, and the detection system 1
0, if the electrical energy supply circuit 16 is operated in response to the voltage between the other end of the reinforcing wire 31 and the ground, electrical energy of about 50 mW can be easily obtained. To give a specific example, if the reinforcement wires 3 of the optical fiber cable 30 are set to 1 ohm and the power consumption is 50 mW, then at 10 V it will be approximately 5 ohms.
mA, the voltage drop across the reinforcing wire 31 is 5V. Therefore, by sending a voltage of 15V from the receiving system 20, the intended purpose can be sufficiently achieved. For example, 50 rnW
If we were to use batteries to generate electrical energy, a 200 mAh lithium battery would have a lifespan of only 40 hours, and a solar cell would require a conversion efficiency of 10 mW to obtain 50 mW of power.
For this purpose, a 500 mW light source is required, and even if a radar diode is used for output, it is difficult. In addition, since the first pond uses chemical principles, its characteristics deteriorate significantly at high temperatures.

Next, FIG. 4 shows a second embodiment of the device of the present invention in which an intrinsically safe explosion-proof safety barrier 26 is provided between the electrical energy supply circuit 25 and the reinforcing wire 3 of the original fiber cable 30. FIG.

This safety keeper 26 consists of a fuse 26a, a Zener diode 26b inserted between the ground and the fuse 26a, and a voltage adjustment resistor 26-c.

With such a configuration, in the unlikely event that the electrical energy supply circuit 2
5 fails and a high voltage is generated, the output side energy of the safety barrier 26 is suppressed by the Zener diode 26b of the safety barrier 26, so that, for example, the reinforcing wire 31 is grounded and an electric spark is generated. Explosive gas will not be ignited even if the gas is used, and explosions can be prevented.

In Fig. 3, the internal power supply was created by insulating the DC-DC converter, but AC energy is transmitted from the electric energy supply circuit 25, and the secondary voltage of the transformer is rectified by the detection system 10 to generate the required voltage. A voltage may be obtained. In the figure, 16' is an electrical energy supply circuit that receives an alternating current signal.

Normally, even if noise is superimposed on the power supply line, which is the reinforcing wire 31, it has no effect on the optical fiber cable that is the original information transmission system, and since the detection system 10 is insulated with a transformer, it is not affected by electrical noise. Hard to accept.

Next, FIG. 5 shows a third embodiment applied to a system for controlling an operating end of a valve or the like. In the figure, 41
is a detection end, 42 is a controller that transmits the detection number of the detection end 4 as a pulse width modulated or frequency modulated optical pulse signal, and 24 is a controller that converts an optical/cell signal into an electrical signal with a certain pulse width or frequency. A light-to-signal converter 27 is an analog signal converter that converts the signal into an analog electrical signal and controls the operating end 28 . Generally, the operating end 28 uses a pneumatic signal that requires a large force, and an electrical signal that requires a large amount of force.
It is converted into an air pressure signal by an air converter, but in the case of optical transmission, if it is an original pulse signal that has been i4 pulse width modulated or frequency modulated, it is necessary to convert this into an analog signal by an analog signal converter 27. be. This analog signal converter 2
7 usually requires electrical energy of 100 to 300 mW, but it is impossible to satisfy this with batteries, and the same is true of solar cells, and this device can be put to practical use for the first time.

Note that in the above embodiment, one optical fiber cable 30
However, for example, in the case where two optical fiber cables 3θ and 30 are used, one of them may be used instead of the ground.

〔Effect of the invention〕

As detailed above, according to the present invention, electrical energy is transmitted to the destination using the reinforced wire of the optical cable without using a special power supply cable. It is inexpensive in terms of cost, solves the problem of lifespan, and allows the detection system to measure the desired target stably and with high precision.Furthermore, it has excellent noise resistance and has intrinsically safe explosion-proof function, which is an advantage in the case of optical transmission. It is possible to provide an optical information transmission device that can be implemented without impairing the performance.

[Brief explanation of the drawing]

Figures 1 and 2 are block diagrams of conventional equipment, respectively.
5 through 5 show the components of first through third embodiments of the optical information transmission apparatus according to the present invention. DESCRIPTION OF SYMBOLS 10... Detection system, 16... Electrical energy supply circuit, 20... Receiving system, 25... Electrical energy transmission circuit, 26... Safety holder, 30... Optical fiber cable, 31 ...Reinforcement line.

Claims (1)

[Scope of Claims] A detection system that detects a predetermined target, converts it into an original pulse signal, and outputs it, and a reception system that receives the original pulse signal of this detection system via an original fiber couple. In the source information transmission device, an electric energy sending circuit is provided in the receiving system or the detecting system and sends out electric energy, and the electric energy sent from this sending circuit is transmitted through the reinforcing wire of the original fiber cable. an electric energy supply provided in the detection system or reception system and supplying the electric energy transmitted by the means to each functional part of the detection system or reception system; An optical information transmission device comprising a circuit.