JPS581298A - Optical measuring system - 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 This publication relates to a measurement system, a predecessor measurement system that uses an optical 7-eyeper as the measurement system 411.

Generally, in this type of measurement system, the field (
Hanba) In addition to installing a large number of sensors and transmitting measurement notes from these sensors to the central control room and distributing them to appropriate departments, we also monitor the field situation.

However, if wiring is performed for each sensor in this case, the wiring work cost will be very high. Therefore, we installed one unit per multiple sensors on the field side.
By installing a u-mote multiplexer, connecting the multiplex police/tana and the management type with fewer lines than the number of sensors, and sequentially calling the sensors from the management room side, -
A method has already been proposed in which 5K is paid by receiving notes from NINSA.

However, since most of these methods use electricity 4I4#, countermeasures must be taken under conditions of electromagnetic/general electric conduction noise Km< and explosiveness. The problem is that it doesn't. Furthermore, since it is an electrical signal, it generally requires one pair (two) of metal conductive wires, which has the disadvantage that the distance between installed devices becomes long or the cost increases when the number of wires increases.

This invention is considered as above, and aims to provide a high-precision measurement system that is simple and unaffected by noise and the like.

According to the present invention, the above object is to install a common remote multiplexer corresponding to a plurality of sensors, and connect the armpit multiplexer and the central control room to at least two systems for transmitting and receiving optical signals.
Optical coupling is performed by the light 7 eyeper of the book, and the control room side sends optical energy and sensor selection 414# to the multiplexer.The multiplexer converts the optical signal sent from the control room into electrical energy and supplies power to each part. This is particularly achieved by configuring the system so that a predetermined sensor is selected based on the selection compensation 4#, and the optical signal is modulated based on its detection signal and transmitted to the control room.

Embodiments of the present invention will be described below with reference to the drawings.

No. 1111 is a block diagram showing an embodiment of the present invention, and No. 1Ii21i is a block diagram showing a modification thereof.

In these figures, 1 is the central control room and the signal station Ruguan Road 2
．． It consists of a modulation circuit 3, a light source 4, and an optical-to-electrical conversion circuit. 8 is a remote multiplexer, and an optical splitting element 9, an optical
Electric conversion circuits 10, 11, selection circuit 12. Modulation circuit 13
and an electric-optical conversion circuit 14, and two optical fibers 6 are connected between the multiplexer GL'8 and the control room 1.
Optically coupled by γ. In addition, 1! S is 1 in 1
A plurality of them are provided for one multi-Fletana 8.

A high energy source, such as a laser, is used for the light 114, which supplies energy to the remote multiplexer. At the same time, in order to superimpose the selection command IF sound to select the sensor 1s of the sensor 1s installed in the 1st wing field, the light Il
A modulation circuit 3 for optically modulating [4] is connected. light 11
4 is connected to the party 7 AIPA 6, and the light on which the Senna selection command signal is superimposed is guided to the remote multiplexer 8.

The light received by the multiplexer 8 is branched by an optical branching element 9 (for example, a half mirror) K, one of which is converted into electrical energy by an optical-electrical conversion circuit 10,
Electrical enclosure and sensor 1 in remote multiplexer 8
It is used as a power source to drive 5.

If you want to save electrical energy, sensor selection circuit 1
If you set it to 5, it will supply power only to the Senna selected by 2.

The other branched light beams are converted into electric signals 4# by the optical-to-electrical conversion circuit 11, and sent to a predetermined sensor signal 4# by the sensor selection path 12. Select 15. The electric signal from the selected sensor is converted into an optical signal by an electric-optical conversion circuit 14 via a modulation path 13, and is transmitted to the control room 1 via an optical 7-eyeper 7. On the control room side, this signal is converted into an electrical signal by an optical-electrical conversion circuit 5, whereby the signal processing circuit 2 can perform control and monitoring functions.

In the figure, the light from the light 1 [4 is modulated to superimpose the selection signal on the optical energy and send it to the remote multiplexer 8, but the light source for the optical energy and the light source for the selection signal are This can also be done by separately providing

Figure 2 shows 1 in that case! In this example, 4 is a light source for optical energy, and 4' is a light source for selection signal.

In this case, an optical branching element is not required, but an additional 7-eyeper is required, but it is desirable to appropriately select the more advantageous one by comparing these costs. Note that other points are the same as those in FIG. 1, so explanations will be omitted.

As described above, according to the present invention, a common multiplexer is provided for a plurality of sensors, the multiplexer and the central tube IJ chamber are optically coupled by at least two optical fibers, and the central tube is 3 m long! Since it is possible to specify the desired sensor from the room and obtain its sensor output, it is possible to provide a highly accurate measurement system that is not affected by noise, etc., and because the number of optical fibers can be reduced, it is easy to use. This has the advantage that it can be used as a system.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing an embodiment of the invention, and Figure 2 is a block diagram showing another embodiment. Code explanation 1...Central control room, 2...Signal section j1 circuit, 3,1
3... Guest circuit, 4.4... Light source, 5.10.11
... Optical-electric conversion circuit, 6.6', 7... Optical fiber, 8... Remote multiplexer, 9... Optical splitter, 12... Selection circuit, 14... Electrical-optical conversion route, 15... Senna agent, patent attorney Akio Namiki, agent patent attorney Kiyoshi Matsuzaki

Claims (1)

[Claims] One remote multiplexer is provided corresponding to a plurality of sensors that detect physical quantities, and the multiplexer and a control means for remotely controlling the multiplexer are coupled by at least two optical transmission lines for transmitting and receiving optical signals, A predetermined sensor is selected by superimposing a sensor selection signal on the energy light or sending the senna selection signal light and the energy light separately to the multiplexer from the control means, and a detection signal is obtained from the sensor. In the optical meter column system, the multiplexer includes means for converting optical energy from the energetic light into electrical energy and supplying power to a predetermined IIl in the scissors multiplexer;
An optical system comprising: means for selecting a predetermined sensor based on the senna selection signal; and means for modulating and transmitting an optical signal in accordance with a detection signal from the selected sensor. measurement system.