Optics: measuring and testing – Range or remote distance finding – With photodetection
Reexamination Certificate
2011-08-02
2011-08-02
Tarcza, Thomas (Department: 3662)
Optics: measuring and testing
Range or remote distance finding
With photodetection
C356S003010, C356S003100, C356S004100, C356S005010
Reexamination Certificate
active
07990521
ABSTRACT:
In a distance/speed meter, first and second semiconductor lasers emit parallel laser light beams to a measurement target. A first laser driver drives the first semiconductor laser such that the oscillation interval in which at least the oscillation wavelength monotonically increases repeatedly exists. A second laser driver drives the second semiconductor laser such that the oscillation wavelength increases/decreases inversely to the oscillation wavelength of the first semiconductor laser. First and second light-receiving devices convert optical outputs from the first and second semiconductor lasers into electrical signals. A counting unit counts the numbers of interference waveforms generated by the first and second laser light beams and return light beams of the first and second laser light beams. A computing device computes the distance to the measurement target and the speed of the measurement target from the minimum and maximum oscillation wavelengths of the first and second semiconductor lasers and the counting result obtained by the counting unit.
REFERENCES:
patent: 2008/0181354 (2008-07-01), Ueno
patent: 2006-313080 (2006-11-01), None
Ueda et al., “Distance Meter Using Self-Mixing Effect of Semiconductor Laser”, Papers for 1994 Tokai-Section Joint Conference of the 8 Institutes of Electrical and Related Engineers.
Yamada et al., “Study of Compact Distance Meter by Self-Coupled Effect of Laser Diode”, Bulletin of Aichi Institute of Technology, vol. 31B, 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.
Blakely & Sokoloff, Taylor & Zafman
Ratcliffe Luke
Tarcza Thomas
Yamatake Corporation
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