23 February 2018 Optical distance measuring method using fast frequency noise characteristics of a laser diode
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Abstract
While standard laser range finders use modulation signals, such as sharp pulses, the method we devised employs laser diode's frequency noise, and a frequency discriminator, to produce the intensity noise signal, which we use to generate fast physical random numbers. Observed through a frequency discriminator, beams traveling along two different paths share intensity noise patterns, i.e., the same fast physical random numbers, but with a time lag. We compared the two, and calculated their cross-correlation. By sweeping their time lags, we confirmed the length of the two optical paths, up to 50m.
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Daiki Kawakami, Masamichi Suzuki, Ryotaro Kimura, Takashi Sato, Takahiro Saito, Masashi Ohkawa, Yasuo Ohdaira, Shuichi Sakamoto, "Optical distance measuring method using fast frequency noise characteristics of a laser diode", Proc. SPIE 10526, Physics and Simulation of Optoelectronic Devices XXVI, 105260W (23 February 2018); doi: 10.1117/12.2288086; https://doi.org/10.1117/12.2288086
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