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Proceedings Paper

Improvement of acquisition time using high speed MEMS bolometer in active imaging
Author(s): Isao Morohashi; Ya Zhang; Boqi Qiu; Norihiko Sekine; Kazuhiro Hirakawa; Iwao Hosako
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Paper Abstract

For establishing terahertz (THz) imaging with rapid scan, the influence of the response speed of a microelectromechanical system (MEMS) bolometer on the image quality have been evaluated and compared it with a pyroelectric detector (PED). The MEMS bolometer was operated with the frequency modulation detection mode in which the frequency shift due to the illumination of the laser light is tracked by a phase-locked loop (PLL) system. In the detection system using the PED, the laser light was chopped by an optical chopper and output signals were measured by a lock-in amplifier. Output signals from the detection systems were recorded by an analog-to-digital converter (ADC). An etched metal bookmark was used for the imaging object and imaging was made by a combination of continuous scans in the X direction and step scans in the Z direction. In imaging using the MEMS bolometer under a stage speed of 25 mm/s, the fine structures composed of very small holes much smaller than 1 mm were clearly observed. The images acquired by the MEMS bolometer were almost the same quality regardless of the stage speed, while in the case of the PED the images were distorted with increasing the stage speed. This is due to the bandwidth of the detectors. These results imply that the MEMS bolometer enables to acquire images with rapid scanning.

Paper Details

Date Published: 11 March 2020
PDF: 4 pages
Proc. SPIE 11331, Fourth International Conference on Photonics Solutions (ICPS2019), 1133104 (11 March 2020); doi: 10.1117/12.2553016
Show Author Affiliations
Isao Morohashi, National Institute of Information and Communications Technology (Japan)
Ya Zhang, Tokyo Univ. of Agriculture and Technology (Japan)
Boqi Qiu, The Univ. of Tokyo (Japan)
Norihiko Sekine, National Institute of Information and Communications Technology (Japan)
Kazuhiro Hirakawa, The Univ. of Tokyo (Japan)
Iwao Hosako, National Institute of Information and Communications Technology (Japan)

Published in SPIE Proceedings Vol. 11331:
Fourth International Conference on Photonics Solutions (ICPS2019)
Tetsuya Kawanishi; Surachet Kanprachar; Waranont Anukool; Ukrit Mankong, Editor(s)

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