新型多波长红外同步粉尘、气体浓度传感器

The Novel Multi-wavelength Infrared Sensor for Simultaneous Measurement of Dust and Gas Concentration

基于粉尘和气体对红外光散射和吸收导致的衰减作用原理,提出了一种可以同步测量粉尘和气体浓度的新型多波长红外传感器设计方案。将不同粒径的粉尘和不同种类的气体作为不同介质,建立多个波长红外光与多种介质的衰减方程组,测量各介质对若干不同波长红外光波的衰减,从而通过计算得到不同待测介质的浓度。传感器结构采用多路对不同波长敏感的探测器,复用一个宽谱红外光源,降低了多种粉尘、气体同时测量的硬件成本。在实验室条件下通过模拟试验对设计方案进行了原理验证,试验结果验证了粉尘和气体同时测量的可行性。提出的多种粉尘和气体同步测量的多波长红外传感器设计方案对于拓宽多波长红外传感技术的应用,特别是煤矿生产的安全监测具有重要意义。

Based on the principle of infrared fight attenuation induced by absorbing and scattering effect of dust and gas, a novel design of multi-wavelength infrared sensor, which is capable of measuring the concentration of dust and gas synchronously, is proposed in this paper. The gas and dust with different diameters are considered as different medium, and the group of attenuation equations for multi-wavelength infrared light according to multi-medium is established. By means of measuring the optical attenuation of multi-wavelength, the concentration of multi-medium can be obtained from the group of equations. There is only one broad band infrared optical source and several detectors according to the multi-wavelength needed for the sensor system, which realizes the low cost. With the purpose of approving the proposed design principle, the test experiment in the laboratory is realized. The experimental results approve the feasibility of simultaneous measurement of dust and gas concentration by the proposed sensor. It seems that the proposed novel multi-wavelength sensor is not only a development of the multi-wavelength infrared sensing technique but also a interesting and significant solution for the safety monitoring in the coal mine.