Fire smoke scattering and light extinction feature measuring device

Abstract

The invention discloses a fire smoke scattering and extinction feature measuring device, the device includes a smoke outbreak transmission part, a scattering and light extinction measuring part and a signal processing part, wherein the smoke outbreak transmission part includes a smoke box, a draught fan, a spraying nozzle and a gas pipe line, the scattering and light extinction measurement part includes a laser device, a diaphragm, a light trap, a photomultiplier tube, a photodiode, a light filter and a ring rail, the signal processing part includes a front amplifier, a transresistance amplifier, a collection card and a computer. The method adopts two light sources with different wavelengths and a variety of detectors, and can simultaneously and continuously measure the multi-angle scattering feature and the light extinction feature of fire smoke.

Description

technical field [0001] The invention belongs to the technical field of fire detection and alarm, in particular to a fire smoke scattering and extinction characteristic measuring device, which can simultaneously and continuously measure the multi-angle scattering characteristics and extinction characteristics of fire smoke. Background technique [0002] Photoelectric smoke detectors play a pivotal role in early fire alarms, and their rapid response to fires can effectively reduce casualties and property losses. However, the existence of interference sources such as water vapor, kitchen fumes and dust particles can easily cause false alarms. In order to fundamentally solve the false alarm problem of photoelectric smoke detectors, it is necessary to conduct in-depth research on the optical characteristics of the smoke generated during the fire, such as scattering characteristics and extinction characteristics. [0003] In the current methods for measuring the optical character...

AI Technical Summary

Problems solved by technology

The existing device for simultaneously measuring the scattering and extinction characteristics of atmospheric aerosols, such as patent CN103308482 A, also uses the method of filling the aerosol in the container and then measuring it. The optical system required for the realization of this method is relatively complicated, and the required aerosol There are generally few particles in the sample, so it is not suitable for measuring the scattering and extinction characteristics of fire smoke with relatively many particles

Another example is the invention patent CN 102636459 A, although it can also measure scattering and extinction at the same time, it does not make clear regulations on the gas path, and it uses a single light source, which can only measure the forward 20°-50° Measurement of scattering properties in a small angular range

Images