Photon detector calibration device and calibration method based on infrared railway vehicle detection

Abstract

The invention, which belongs to the field of railway safety monitoring, discloses a photon detector calibration device and calibration method based on infrared railway vehicle detection. The calibration device is composed of a photon detector, an amplification processing circuit, a comparison circuit, a refrigeration control module, an upper computer, a protection door and an ambient temperature sensor. In addition, according to the calibration method, one or more sensitive elements are aligned at a semiconductor refrigeration sheet with the controllable and relatively constant temperature; and voltages, obtained by the sensitive elements, of target infrared irradiation are corrected and detected by using the voltage after infrared irradiation transform of the refrigeration sheet as a reference voltage. The protection door of a detection box is used for system calibration and a corresponding parameter is corrected in a non-detection state, so that the high detection accuracy and reliability are ensured. The drifts of the photon detector and the back-end circuit can be minimized; parts like a baffle, a zero-correcting circuit, and a zero-correcting control power supply for calibration in the original system are removed; fault points are reduced; the system reliability is improved; and continuous, low-drift, reliable and stable detection of the system is realized.

Description

technical field [0001] The invention belongs to the field of railway safety monitoring, in particular to a photon detector calibration device and calibration method based on infrared detection of railway vehicles. Background technique [0002] In the field of railway safety monitoring, trains have multiple components that need to be monitored during operation, such as axle boxes, brake discs, traction motors, and gearboxes; when these components fail, they are often accompanied by severe heating. [0003] The railway vehicle infrared detection related system uses infrared detection technology to detect and overheat the key operating components. The most common method is to use a photon detector for detection, but the photon detector uses a DC coupling method to process the signal. The DC coupling method is simple and reliable, but the output voltage after amplification will drift. If the drift is too large, it will directly affect the detection accuracy and affect the norm...

AI Technical Summary

Problems solved by technology

[0005] 1. The baffle is an external mechanical structure, which is difficult to integrate and miniaturize;

[0006] 2. The operation of the baffle requires mechanical components such as motors, coupling brackets, and baffle control circuits, which are prone to problems during use and cannot be opened or closed, resulting in system detection failures;

[0007] 3. The baffle is generally placed outside the infrared probe, and the temperature changes rapidly, which affects the detection accuracy

[0008] 4. There is a certain drift in the zeroing circuit, and problems in the hold state will directly affect the output voltage of the detector

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