Physical quantity sensor and physical quantity measuring method

Details Physical quantity sensor and physical quantity measuring method Physical quantity sensor and physical quantity measuring method

2011-06-14

2011-06-14

Tarcza, Thomas H (Department: 3662)

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

C356S028000

Reexamination Certificate

active

07961302

ABSTRACT:
A physical quantity sensor has a semiconductor laser, a laser driver for providing, to the semiconductor laser, a driving electric current that is a waveform wherein the maximum portions and minimum portions of a triangle wave have been rounded; detecting means (a photodiode and a current-voltage converting amplifier) for detecting an electric signal that includes an interference waveform that is produced by the self-coupling effect between a laser beam that is emitted from the semiconductor laser and a return beam from a measurement object; and measuring means (a filter circuit, a counting device, and a calculating device) for calculating a physical quantity for the measurement object from interference waveform information.

REFERENCES:
patent: 2003/0016365 (2003-01-01), Liess et al.
patent: 2009/0154521 (2009-06-01), Wang et al.
patent: 2006-313080 (2006-11-01), None
Ueda, et al., “Distance Measurement Using the Self-Coupling Effect of a Semiconductor Laser”, 1994 Transactions of the Institute of Electrical Engineers of Japan, Tokai Branch 1994.
Yamada et al., “Study of Compact Distance Meter by Self-Coupled Effect of Laser Diode” Aichi Technical University Researcher Report, No. 31 B, pp. 35-42, 1996.
Giuliani et al., “Laser Diode Self-Mixing Technique for Sensing Applications” Journal of Optics A: Pure and Applied Optics, pp. 283-294, 2002.

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