Passive thermal imaging detection system and method based on terahertz quantum well detector

Abstract

The invention discloses a terahertz quantum well photodetector (THzQWP)-based passive thermal imaging detection system and a method thereof. A photoconduction THzQWP is taken as a photodetector, a self-designed radiation signal denoising modulation method, a synchronous control module and a signal transmission-convergence light path are adopted, and THzQWP-based passive thermal imaging detection is finished; a thermal radiation signal is modulated by an adjustable aperture diaphragm and a wave chopper at an acquisition end of the thermal radiation signal, and the modulation frequency is set by the wave chopper; a photoconduction mode is adopted at a signal detection circuit end of the THzQWP, the THzQWP receives the radiation signal through an off-axis parabolic mirror group convergence light path and extracts a THz signal, stable bias voltage is applied, THzQWP photocurrent is converted into voltage by a transimpedance amplifier, the voltage is amplified by a low noise amplifier, anddata is read by a phase-locked amplifier; and the read signal is recorded and processed by the synchronous control module, and thermal image information is acquired finally.

Description

technical field [0001] The invention relates to a system and method for passive thermal imaging detection using a terahertz (THz) quantum well detector (QWP, Quantum Well Photodetector). The invention belongs to the application technical field of semiconductor photoelectric devices. Background technique [0002] Passive thermal imaging is a technology in which a thermal image detector extracts target feature information based on a thermal image by receiving the thermal radiation of an object and converting it into an electrical signal and reflecting it on a thermal map. This technology uses detectors to obtain different thermal radiation images, namely heat maps, by measuring the thermal radiation ray difference between the target and the background. The heat map of the target reflects the distribution image of the target surface temperature. The size of the thermal radiation energy of an object is related to the surface temperature of the object. This characteristic of th...

AI Technical Summary

Problems solved by technology

The huge potential of terahertz imaging has driven researchers from all over the world to conduct in-depth and extensive research on it. However, the current research on THz wave passive thermal imaging technology is still in the exploratory stage, and the analysis and processing technology of terahertz image information needs to be further developed. Practical

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