Infrared photon detector for train axle temperature detecting probe

Abstract

The present invention belongs to measurement technology and relates to improve photosensitive part used in train axle temperature detecting probe. The detector of the present invention incldues one immersed lens and one photosensitive element fixed via immersing glue to the center of the immersed lens, and features one compensating element, which is fixed near the photosensitive element and has its material, structure, size and immersing glue comdpletely the same as those in the photosensitive element. The present invention has fast response, automatic compensation and thus less influence of environment temperature change.

Description

technical field [0001] The invention belongs to the measurement technology and relates to the improvement of the photosensitive part used for the train shaft temperature probe. Background technique [0002] At present, the structural principle of a train shaft temperature probe using a photon detector is as follows: figure 2 shown. Inside the probe housing 8 there is an optical assembly housing 7 , a circuit box 10 and a cable connector 9 . Optical filter 5, convex lens 6 and photon detector as photosensitive parts are arranged in optical assembly housing 7, and it is made up of immersion lens 3 and the photosensitive element 1A that is bonded in immersion lens 3 plane centers (referring to figure 1 ). The optical path design ensures that the photosensitive element 1A is located at the focal point of the optical system. The photosensitive element 1A is a photoresistor made of indium antimonide or mercury cadmium telluride, and each of its two ends has a pin made of a va...

AI Technical Summary

Problems solved by technology

This kind of photon detector has only one photosensitive element. In order to solve the problem of temperature drift, complex circuits must be used for temperature compensation, so the response speed is low and the temperature compensation effect is poor.

It can accurately detect the axle temperature of low-speed trains, but it cannot meet the needs of high-speed trains

When the train is running at high speed, due to the thermal hysteresis of the photosensitive element, the response curve will be distorted and the response sensitivity will decrease, which will lead to an increase in the error of the shaft temperature measurement, and the possible accident hazards cannot be predicted in time and accurately

There is a photon detector for shaft temperature detection abroad, which is suitable for high-speed trains. It uses a semiconductor refrigerator to stabilize the ambient temperature of the photosensitive element, resulting in high prices and low reliability.

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