5 Papers
4 Citations
Koji Hashiguchi is an academic researcher from National Institute of Advanced Industrial Science and Technology. The author has contributed to research in topics: Cavity ring-down spectroscopy & Wavelength. The author has an hindex of 2, co-authored 5 publications.
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Papers
A miniaturized trace-moisture sensor based on cavity ring-down spectroscopy
TL;DR: In this paper, the authors developed a miniaturized sensor based on cavity ring-down spectroscopy (the mini-CRDS sensor) for real-time measurement of trace moisture.
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Dual-laser cavity ring-down spectroscopy for real-time, long-term measurement of trace moisture in gas
TL;DR: In this article, a dual-laser CRDS was used for real-time, long-term measurements of trace moisture in the range of 8 nmol mol−1 −630 nmolmol−1.
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Measurement error in frequency measured using wavelength meter due to residual moisture in interferometer and a simple method to avoid it
Koji Hashiguchi,Hisashi Abe +1 more
TL;DR: In this article, an error of approximately 50 MHz was observed in the frequency measurement using the wavelength meter in the near-infrared region although the accuracy specified in the catalogue was 20 MHz.
5
Parts-per-trillion sensitivity for trace-moisture detection using wavelength-meter-controlled cavity ring-down spectroscopy
TL;DR: In this article, a frequency control and temperature control system was proposed for cavity ring-down spectroscopy, where the frequency of the probe was shifted from 1393 nm to 696.5 nm to avoid measurement errors in laser frequency due to residual moisture in the built-in Fizeau interferometer of a wavelength meter.
Wavelength-meter controlled cavity ring-down spectroscopy: high-sensitivity detection of trace moisture in N2 at sub-ppb levels
TL;DR: In this paper, the frequency of the probe laser is coupled to a resonant frequency of a cavity using a high-resolution wavelength meter, and the repetition rate of measurement of the ring-down events obtained is 150 Hz.