Terahertz detector parameter measuring device and measuring method

Abstract

The invention discloses a terahertz detector parameter measuring device and measuring method which are used for measuring parameters of various terahertz detectors such as response degree. According to the terahertz detector parameter measuring device and measuring method, a method of intercomparison measurement between a standard terahertz detector with an absolute response degree and a terahertz detector to be tested is adopted. The method comprises the steps that terahertz radiation of a reference terahertz radiation source and background radiation of a liquid-nitrogen refrigerating black body are modulated to be periodical changed terahertz radiation signals by a light chopping slice, the periodical changed terahertz radiation signals are alternately sent to an optical system in a period and sent to the standard terahertz detector or the terahertz detector to be tested finally, and the periodical changed terahertz radiation signals are converted to periodical changed voltage signals and processed by a phase-lock amplifier to obtain measuring voltage signals; parameters of the response degree, noise equivalent power and the like of the terahertz detector to be tested are calculated and obtained according to the absolute response degree value of the standard terahertz detector. The terahertz detector parameter measuring device is arranged in a liquid-nitrogen refrigerating low-temperature vacuum background channel, the influence of background noise on the accurate measurement of the terahertz detector is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of optical metrology, and mainly relates to a terahertz measuring device and a measuring method, in particular to a terahertz detector parameter measuring device and a measuring method. Background technique [0002] In recent years, terahertz technology has been a cross-cutting cutting-edge high-tech that has been researched at home and abroad, and has great application prospects in fields such as security inspection, anti-terrorism, deep space exploration, terminal communication, medicine, and material detection. Among them, the development and production of terahertz detectors are the key problems restricting the research of terahertz imaging detection, communication and other fields. [0003] Terahertz detectors mainly include Golay detectors, Bolometer detectors, Thomas detectors, pyroelectric terahertz detectors, Schottky diodes, terahertz pulsed photoconductive detection antennas, terahertz heterodyne ...

AI Technical Summary

Problems solved by technology

Since this method calculates the responsivity value by measuring relevant parameters and combining with the mathematical model, the error of the mathematical model itself will lead to inaccurate responsivity value

In addition, the experimental device in this method is tested at room temperature, and there will be a large background infrared radiation, which will greatly interfere with the measurement results.

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