Compact detection system for realizing handheld terahertz reflection spectrum detection

Abstract

The invention discloses a compact detection system for realizing handheld terahertz reflection spectrum detection. The detection system comprises a terahertz detection head optical subsystem which consists of a collimating lens group, a beam shrinking lens group, a THz turning light path, a THz window and a 3D printed detection head structure; a terahertz source subsystem which is composed of a femtosecond laser, an optical fiber and coupler and a THz emitter; and a terahertz detector subsystem which is composed of a femtosecond laser, an optical delay line, an optical fiber and coupler, a THzreceiver, an amplifier and a computer. The terahertz detection head optical subsystem inputs divergent terahertz waves emitted by a terahertz source on the surface of a detection substance in a uniform and collimated mode and enables reflected terahertz waves to be focused on the receiving surface of the terahertz detector; the terahertz waves emitted by the terahertz source are firstly collimated into uniform parallel light through the collimating lens group, then the uniform parallel light is emitted from the terahertz window through the turning light path to irradiate the surface of the detection substance, and finally the reflected terahertz waves are focused to the photosensitive surface of the THz receiver through the beam shrinking lens group through the terahertz window and the turning light path.

Description

technical field [0001] The invention relates to a compact detection system for realizing handheld terahertz reflection spectrum detection, which adopts a transmissive optical path, and is used to solve the problem that the existing terahertz reflection spectrum detection optical path is too large for beam expansion, collimation and focusing by means of mirrors , unable to realize miniaturized handheld detection. However, the present invention adopts the TPX material which is transparent in both THz and visible light bands, which reduces the difficulty of installation and adjustment of the transmissive optical path, and is suitable for the Terahertz Time-Domain Spectral Detection System (THz-TDS). The miniaturized and compact design and the water vapor-removing airtight design ensure that the invention is suitable for any industrial, public or scientific research environment, and has excellent performance and high flexibility. Background technique [0002] As one of the most...

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Problems solved by technology

[0008] Although the exploration and research of reflection terahertz spectral detection system have been carried out for a long time at home and abroad, there are still no reports on the products similar to the idea of ​​the present invention.

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