Optical movement information detector, movement information...

Details Optical movement information detector, movement information... Optical movement information detector, movement information...

2006-05-23

2006-05-23

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C356S028500, C356S496000, C356S218000

Reexamination Certificate

active

07049578

ABSTRACT:
Two different phase components obtained by splitting interference light of light from an object by a diffraction grating are guided to first and second PD's by a second optical system. A first signal is outputted from a first signal processing circuit section that receives light reception signal from first PD, and a second signal is outputted from a second signal processing circuit section that receives a light reception signal from the second PD. A third signal of an interference light signal whose noise component is removed is outputted by a third signal processing circuit section using the first signal and the second signal. Then, the frequency of the third signal is detected, and the movement velocity of the object is detected by a movement velocity detection section on the basis of the frequency.

REFERENCES:
patent: 5187538 (1993-02-01), Iwamoto et al.
patent: 2005/0046824 (2005-03-01), Wada et al.
patent: 3-235060 (1991-10-01), None
patent: 5-323030 (1993-12-01), None
Yeh et al., “Localized Fluid Flow Measurements with an He-Ne Laser Spectrometer”, Applied Physics Letters, vol. 4, No. 10, May 15, 1964, pp. 176-178.

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