Pen type free field light sensation temperature sensor

Abstract

The invention relates to a pen type free field light sensation temperature sensor, belonging to the signal detection technology field. The sensor comprises an optical path protective case body, an optical device, a cavity short fiber and an external fiber interface. By utilizing a point frequency filtering characteristic of a narrowband filter plate, a miniature total reflection prism, a plane convex lens and a filter plate are integrated in a stainless steel shell with a window at a side surface. Leading flow covers of the shell are in alignment with a detonation center and are distributed in a detonation field according to a certain rule. When cloud detonation happens, substances around the sensor are subjected to reaction and emit strong light. Through the window at the side surface and an internal optical path, the sensor introduces a signal into a subsequent photoelectric signal conversion and acquisition apparatus, and the signal is recorded to complete measurement of light temperature. The sensor has a simple structure and a small volume. Through a plurality of sensors distributed in the cloud detonation field, information of field center temperature and temperature gradient distribution can be obtained, and the sensor is suitable for a severe environment with strong impact and strong shock.

Description

technical field [0001] The invention relates to a pen-type free-field light-sensitive temperature sensor, which belongs to the technical field of signal detection. Background technique [0002] With the development of modern industry, industrial explosion accidents happen from time to time. M&MPC (Marsh&Mclennan Protection Conclusion) statistical analysis of 150 industrial disasters in 1989 showed that industrial explosion disasters accounted for about 60% of the total industrial disasters and were one of the most important industrial disasters. Among all kinds of industrial explosion accidents, a considerable part is caused by the explosion of flammable substances suspended in the air. For example, in the process of coal mining, after gas, coal dust and air are mixed and reach a certain concentration, explosion accidents can occur when encountering unexpected energy such as sparks; in petroleum and chemical production, the leaked combustible gas or small droplets are scatt...

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Problems solved by technology

However, due to the limitation of testing methods, the existing research on thermal damage of detonation temperature field still stays in the qualitative analysis based on experience

In recent years, the theory of non-contact optical temperature measurement has developed rapidly, and many new temperature measurement methods have emerged. However, on the one hand, due to the complex optical system and precise coordination of these methods, strong vibration in the detonation field will cause disorder in the optical system. , cannot be tested; on the other hand, the shock resistance of optical devices is relatively poor, and some optical devices are fragile

Therefore, these precision instruments can only detect the entire cloud explosion area away from the cloud and fog detonation field, and the test results are the average temperature of the cloud and fog detonation area, but cannot obtain the distribution of the detonation center temperature and its temperature gradient

Although the infrared detection method can display its general temperature gradient, due to the large number of opaque substances and smoke in the cloud detonation, the test accuracy is seriously affected

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