Infrared-distance-detection-based flame detection device of full-automatic fire-fighting water monitor
A flame detection device and distance detection technology, applied in electric radiation detectors, fire rescue, etc., can solve problems such as difficult detection of jet drop points, and achieve the effect of improving detection distance and sensitivity, and accurate judgment
Inactive Publication Date: 2018-03-06
NANJING UNIV OF SCI & TECH
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Problems solved by technology
Using visual technology to detect flame signals, there are many features to extract flame signals. Since the jet landing point is scattered, it is difficult for visual technology to detect the jet landing point
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[0029] Such as figure 2 , image 3 As shown, the mirror surface of the pyroelectric infrared sensor is usually a circle with a diameter of 5mm or a square with a diameter of 5mm*5mm, and the photosensitive surface is very small. In order to obtain continuous flame acquisition signals, special processing is required. According to the knowledge of physics, we know that after the parallel rays are refracted twice on the lens, they are concentrated on the focal point of the lens. Since the distance between the fire source and the detector is far greater than the focal length of the lens, it can be considered that the radiated light from the fire source reaches the lens as parallel light. The pyroelectric infrared sensor is placed at the focal length of the lens, and the radiated light is focused to the sensor through the lens. on the mirror.
[0030] In terms of lens material selection, by comparing the properties of different materials, including silicon, germanium, infrared ...
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The invention discloses an infrared-distance-detection-based flame detection device of a full-automatic fire-fighting water monitor. The infrared-distance-detection-based flame detection device is composed of a pyroelectric infrared sensor, a lens, a slit, an analog signal processing module and a digital signal processing module. The pyroelectric infrared sensor is arranged at a focal length position of the lens; the slit arranged right in front of the lens is used for expanding a visual angle of the lens; the lens is used for carrying out focusing magnification on a flame light signal; the pyroelectric infrared sensor is used for transforming the flame light signal into a voltage signal; the analog signal processing module is used for carrying out amplification and analog filtering on thevoltage signal to obtain an analog signal; and the digital signal processing module is used for carrying out sampling, digital filtering and fast Fourier transform on the analog signal and determining whether a flame exists. The infrared-distance-detection-based flame detection device is suitable for a large-space fire-fighting monitor extinguishing system and has advantages of low price, good real-time performance, and high reliability.
Description
technical field [0001] The invention relates to the field of automatic fire-fighting water cannon fire extinguishing, in particular to a flame detection device of a fully-automatic fire-fighting water cannon based on infrared distance detection. Background technique [0002] The fire detection device is the main triggering device and positioning device in the automatic fire monitor fire extinguishing system. In the current automatic fire monitor control system, the flame fire detection technology has been widely used and has developed very rapidly. With the continuous improvement of people's material living standards, large-scale indoor public places are increasing day by day, and its fire safety issues have gradually entered people's field of vision. [0003] The flame orientation detection device of the traditional automatic fire sprinkler fire extinguishing system usually installs temperature and smoke sensors and other equipment outside the sprinkler. The smoke detector ...
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IPC IPC(8): G01J5/10A62C37/08
Inventor 王超尘何莉君杨滨华邹卫军张展鹏
Owner NANJING UNIV OF SCI & TECH