SU746649A1 - Smoke sensor - Google Patents

Description

(54) SMOKE SENSOR

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The invention relates to the field of automatic signaling, fire control measures may be applied.

Smoke detectors are known that contain a light source that is optically coupled to a radiation detector, which diffuses the radiation flux dissipated by smoke in the event of a fire and is associated with an alarm system.

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The known devices can control only this, limited part of the space, which is their disadvantage, since when a fire situation arises in large rooms, but in a place remote from the device, the device may not respond.

It is also known a device for optical monitoring of air in a large space, which contains several sources of optical radiation, translucent zen, installed at different points of the monitored region, with which the radiation receivers 2 are optically connected.

The radiation ot of the source of optical radiation, the passage and partially reflected from a row of translucent mirrors located one behind the other in the direction to the source and in the direction perpendicular to it, falls on the radiation receivers, thus intersecting different parts of the monitored space. get a signal in the presence of smoke in them.

The drawback of the device consists in the fact that translucent mirrors placed strictly one after the other do not allow to control difficult places of fire-hazardous space, but also signal the appearance of a temperature gradient in the occurrence of a fire. Gago, the device requires

20 a large number of receivers and sources of optical radiation, which also makes it; overly bulky. With sources, receivers are located in a controlled space and can themselves be fire hazardous, i.e. the reliability of the known device is not high. The chain of the invention is to increase the reliability of the device. The goal is achieved by the fact that the radiation transmission system is implemented in the form of sections of a Craxiall fiber with breaks at controlled points in space, in each section of the co-fiber optical fiber the focusing elements are installed, the inner core of the first section of the coaxial fiber is facing the radiation source at the output of the first section of the coaxial fiber. the cores of the last section of the coa & fiber optic guide are installed to suppress the radiation, and the output end of the outer core of the coaxial optical fiber is optically coupled to the radiation receiver. The optical layout of the smoke sensor is shown in the drawing. The Smoke Sensor contains a source of radiation 1, a section of a coaxial light guide 2 with discontinuities 3 controlled points of space, an internal 4 and an external 5 core of a coaxial light guide, a radiation damper 6, a radiation prime 7, light guides of each section are equipped with focusing elements 8 passing through a beam ya corresponding end of the next fiber. The device works as follows. In the absence of smoke or temperature changes, the radiation from the 1 of 1CH source passes through the inner conductors of 4 all sections of the coaxial light guide 2 and enters the damper 6 of the vessel. In the outer core 5 of the coaxial fiber .2 and, therefore, optical radiation does not reach the radiation receiver 7. When a flame is inside the gap 3 between the sections, its particles scatter light, and most intensely forward at a small angle and to the direct radiation of the radiation source. These scattered streams fall on the input stream; 5 coaxial light guide 2 next 12 ц ц г if if п ере ере Й 1

-ll.j- -, .-: -J, 4 cores of a coaxial light guide of all secures to the radiation receiver 7. When a temperature gradient appears, causing turbulences in the path of the direct light beam, which changes the refractive index of hot air (gas), the beam deviates from the average position and falls on the input face of the outer core 5 of the coaxial light guide 2; by means of the latter, to radiation receiver 7. In this way, the appearance of a smoke and a temperature gradient produces a corresponding signal from the radiation receiver 7 and the alarm system is triggered. The use of a coaxial fiber allows one to receive signals in the presence of a color or temperature gradient in hard-to-reach ones, reduces the amount of radiation sources and receivers required for monitoring a large space, and prevents the last external fire suppressed space, i.e. increases the reliability of the smoke detector. . The formula of the invention is a smoke sensor containing a radiation source, a radiation transmission system in a controlled space, a radiation receiver and a radiation dampener, which, in order to improve sensor reliability, the radiation transmission system is made in the form of sections of a coaxial fiber with breaks in controlled points of space, in each section of the coaxial fiber, focus elements are installed, the inner core of the first section of the coaxial fiber is facing towards the radiation source, the output side The inner core of the last section of the coaxial fiber is installed to the radiation absorber, and the output end of the outer core of the coaxial fiber is optically coupled to the radiation receiver. Sources of information taken into account during the examination 1. USSR author's certificate No. 484544, cl. G 08 B 17/10, 1976. 2. German Patent No. 2133080, cl. G 01 N.21 / 12, 1972 (prototype).

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Claims (1)

Claim A smoke detector containing a radiation source, a radiation transmission system in a 30 controlled space, a radiation receiver and a radiation absorber, characterized in that, in order to increase the reliability of the sensor, the radiation transmission system is made in the form of 35 sections of a coaxial fiber with breaks in controlled points of space, in each section of the coaxial fiber, focusing elements are installed, the inner core of the first section 40 of the coaxial fiber has its input end facing the radiation source, at the output of the inner core In the last section of the coaxial fiber, a radiation absorber is installed, and the output end of the outer conductor of the coaxial fiber is optically connected to the radiation receiver.