Resolution and Noise Factor of Distance Measurement Using Two-Photon Absorption Process in Photodetector
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概要
- 論文の詳細を見る
In this paper, we investigate the resolution, accuracy, and noise factor of distance measurement using intensity-modulated light and a photodetector with two-photon absorption (TPA) characteristics. Distance resolution and measurement accuracy are clarified theoretically and experimentally in terms of the sweeping range and the scanning step of the intensity-modulation frequency. The theory of accuracy improvement by signal processing known as the "Fourier transform method" is experimentally confirmed for the first time. The influence of a photodetector's temperature on measurement resolution is also made clear by the experiments. A high resolution is achieved by controlling the photodetector at a low temperature, which is explained from the temperature dependence of TPA sensitivity in the photodetector. In addition to these investigations, we discuss the advantage of the TPA-based distance measurement over other conventional methods such as optical time domain reflectometry from the viewpoints of cost and measurement performance.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2007-08-15
著者
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Takeda Mitsuo
Department Of Cardiology Kyoto First Red Cross Hospital
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Shioda Tatsutoshi
Graduate School Of Engineering Tokyo University Of Agriculture And Technology
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Kurokawa Takashi
Graduate School of Education, Hiroshima University
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Tanaka Yosuke
Graduate School Of Engineering Tokyo University Of Agriculture And Technology
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