Abstract
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.
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