Open AccessTerahertz optical scanning imaging of motionless polyurethane insulation materials
Author(s) -
Qiu Fu Cheng,
Tan Zhiyong,
Wang Chang,
Fu Zhanglong,
Wan Wenjian,
Cao Juncheng
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2019.2282
Subject(s) - terahertz radiation , materials science , polyurethane , optics , transmittance , optoelectronics , photomixing , terahertz spectroscopy and technology , spectrometer , quantum cascade laser , laser , far infrared laser , terahertz metamaterials , composite material , physics
The authors demonstrate a terahertz optical scanning imaging system which utilises a combined 3D translation platform. Three mirrors are installed on the three sliders of the platform to realise the terahertz beam scanning of the motionless object. A pulsed quantum‐cascade laser at the frequency of 4.3 THz and a fast quantum‐well photodetector are employed in this terahertz imaging system to research the polyurethane insulation materials. A Fourier transform spectrometer is applied to measure the transmittance of the polyurethane insulation materials from 2 to 8 THz. The terahertz images of the polyurethane foams with a badge or three drops of water are obtained with great contrast.