Cavity ring-down dual-channel smoke temperature fire detection device based on time-delay frequency division technology

Abstract

The invention discloses a cavity ring-down dual-channel smoke temperature fire detection device based on a time-delay frequency division technology. The device comprises a signal generator, a 1550nm laser source, a laser modulator, an erbium-doped fiber amplifier, a 2 * 2 and coupling ratio 99:1 optical fiber coupler I, a 2 * 2 and coupling ratio 99: 1 optical fiber coupler II, a 2 * 2 and coupling ratio 99: 1 optical fiber coupler III and a 2 * 2 and coupling ratio 99: 1 optical fiber coupler IV, a Mazz dislocation interferometer, an optical fiber delay line, an optical fiber isolator, an optical fiber alignment air chamber, an N * 1 optical fiber beam combiner, a photoelectric detector and an oscilloscope. According to the invention, electronic components are eliminated, the device is suitable for flammable and combustible places with high electromagnetic radiation intensity, the requirements of fire alarm products for detecting smoke and temperature can be simultaneously met, the sensitivity is high, and the production and maintenance cost is low.

Description

Technical field [0001] The invention belongs to the technical field of fire detection devices and methods, and particularly relates to a cavity ring-down dual channel smoke temperature fire detection device with time-delay frequency division technology. Background technique [0002] At present, the fire detectors used in automatic fire alarms in domestic and foreign markets mainly include temperature-sensitive fire detectors, smoke-sensing fire detectors, and composite photoelectric smoke-temperature fire detectors. Among them, the temperature-sensing fire detectors include electronic point-type fixed-temperature fire detectors, cable-type linear-type fixed-temperature fire detectors, electronic-type differential temperature fire detectors, electronic-type differential-fixed-temperature fire detectors, and linear fiber grating temperature-sensing fire detectors Etc.; smoke detectors include photoelectric smoke detectors, ionized smoke detectors and infrared beam laser line smoke ...

AI Technical Summary

Problems solved by technology

[0003] The problems existing in the existing smoke detectors are: 1. Because of the electric signal, there are potential safety hazards in places with flammable, explosive and high electromagnetic radiation intensity; 3. The structure of the detector is complicated, and the maintenance cost is high in the later stage; radioactive elements are used as the ion source, which is very unsafe; 5. It is easily interfered by infrared light and ultraviolet light, and the detection beam is easily blocked, resulting in high false alarms ; 6. It must be used in conjunction with the expensive fire detection controller commonly known as the host

[0004] The problems existing in the existing temperature-sensitive fire detectors are: 1. Because of the electric signal, there are potential safety hazards in places with flammable, explosive and high electromagnetic radiation intensity; 3. The fire positioning performance of the linear heat detector is poor and cannot be reused; 4. The temperature range of the alarm action is wide, resulting in low sensitivity; 5. The use cost and maintenance cost of the linear fiber grating temperature fire detector are very high , it is difficult for general users to accept; 6. It must be used in conjunction with expensive fire detection controllers commonly known as hosts

[0005] At present, the existing problems of the composite photoelectric smoke and temperature fire detector are: 1. Because of the electrical signal, there are potential safety hazards in the flammable and explosive field with high electromagnetic radiation intensity; 2. Electronic components are prone to aging and moisture, and thus False alarm or even failure; 3. The temperature sensing element is placed horizontally, which is easy to be covered by dust and flying insects, resulting in failure or false alarm, and the smoke chamber is not easy to disassemble and dust removal; 4. It is inconvenient to replace the battery regularly; 5. It cannot be networked. Cannot monitor remotely

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