SU894764A1 - Optronic radiation sensor - Google Patents

Description

one

This invention relates to an automatic alarm and can be applied in fire-fighting devices.

Radiation sensors are known that contain a fiber-optical transmission and radiation system and a radiation receiver installed at the output end of the light guide, the radiation receiver being connected to an indicator and an actuator through a signal processing element. When radiation appears at a controlled point where the input end of the fiber is installed, this radiation is transmitted to the receiver causing an electrical signal at its output that controls the actuators and the t1 indicator. The disadvantage of these radiation sensors is the inability to monitor several points simultaneously.

Closest to the proposed radiation sensor, containing optical fibers, the ends of which are combined into a bundle, the output end of which is optically coupled to a differential radiation receiver, and a contact-tracking system, with discontinuities in the optical fibers, into which an indicator of the origin of radiation in the form of an electric motor is inserted. , on the axis of which there is a movable contact of the sensor of the contact-tracking system

10 and a light-tight petal coinciding with the plane of discontinuities of the optical fibers.

A disadvantage of the known device is the presence of a mechanically

15 moving parts whose reliability is lower in comparison with electronic devices.

The purpose of the invention is to increase the reliability of the sensor.

20

The goal is achieved by the fact that an optoelectronic radiation sensor containing optical fibers, the ends of which are combined into a bundle and optically 3 are connected to a radiation receiver and a detector of the point of radiation, and the indicator, the detector of the point of radiation, is made in the form of a modulating frequency synthesizer, optical modulators and a modulating frequency filter block, the outputs of a modulating frequency synthesizer are connected to optical modulators installed at the input ends of optical fibers at controlled points, the inputs The base frequency filter filters are connected to the output of the radiation receiver, and the outputs of the base frequency filter unit are connected to a baseband synthesizer with an indicator. The drawing shows a diagram of a sensor A photoelectric radiation sensor contains optical fibers 1, the ends of which are combined into a harness 2, a radiation receiver 3, and an A detector for the radiation event point consisting of synthesis. modulating frequencies torus 5, optical modulators 6 and modulating frequency filter unit 7, and an indicator of 8 radiation emission points. The modulating frequency synthesizer 5 controls the optical modulators 6 installed at the input ends of the optical fibers 1 in controlled channels. The output end of the harness 2 is connected to the input 3 of the radiation receiver, the output of which is connected to the inputs of the block 7 of filtering frequency modulators. The outputs of block 7 of filters of modulating frequencies are supplied to the indicator 8 points of radiation appearance and synthesizer 5 of modulating frequencies to start it in the case of the appearance of an optical signal in optical fibers I and selection of controlled points. The modulating frequency synthesizer 5 is designed to generate the modulating frequencies of the optical modulators 6, and the number of these frequencies corresponds to the number of controlled points (for each controlled point there is a modulation frequency). In addition, it is intended for the selection of controlled points at which radiation occurs. Optical modulators 6 are designed to impart radiation at a controlled point, an individual feature. The block filter modulating frequency is designed to highlight the frequency W. The output of the optical signal arriving at the 3-radiation receiver (highlighting an individual feature), each of its cells is tuned to a well-defined frequency. Moreover, at the initial moment the unmodulated signal appears, it passes through the cell f (j, causing the start of the synthesizer 5 modulating frequencies, issuing the modulating frequencies to all modulators, then the synthesizer stops feeding the modulating signals to the modulators installed at controlled points, where there is no radiation. The indicator of 8 points of radiation appearance is intended to give visual information about the point of radiation emission. The optoelectronic radiation sensor works as follows .. In the absence of radiation neither at the monitored points the optical signal at the input of the radiation receiver 3 is missing, and therefore no electrical signal is output to the modulating frequency filter unit 7 and the modulating frequency synthesizer 5, and there is no visual information on the indicator 8 points of radiation emergence. controlled points, it passes through an optical modulator 6, which has constant parameters, the transmission of radiation in the absence of a modulating signal from the synthesizer 5 modulating frequencies (the radiation is not modulated This is a light guide 1 and a harness 2 and goes to the input of the radiation receiver 3, at the output of which an electrical signal appears with constant parameters (unmodulated). Since each cell in the modulating frequency filter block is tuned to a well-defined frequency, one is designed to separate the unmodulated signal f (j, the output of the latter is an electrical signal leading to the launch of the synthesizer 5, the modulating frequencies, which begins to generate all the modulating frequencies and send these signals to the corresponding modulators. At the same time, the increased radiation before being introduced into the light guide 1 is subjected to modulation from the side of the optical modulator 6. Pass the light guide 1 and the harness 2, the optical A skip signal arrives at the radiation receiver 3, at the output of which an electrical signal appears that carries information about the individual feature (frequency of the modulating signal). This signal is passed through the block 7 of modulating frequency filters and appears at the input of the corresponding cell, after which indicator of 8 points of radiation appearance, causing the appearance of visual information about the number of the controlled point, and on the modulating frequency synthesizer 5 where the generation of all modulating signals, except for signal corresponding to the monitored point at which radiation appeared.

When radiation appears in any

another point simultaneously with the first one, the device works in complete analogy with the described one.

In the proposed radiation sensor, elements of electronics are used,

Claims (2)

1.UK patent If cl. G 08 C, publish. 1965. 2. The author's certificate No. 723635, cl. G 08 B 17/12, 1978 (prototype).