Optical two-dimensional velocity and/or movement detector

Details Optical two-dimensional velocity and/or movement detector Optical two-dimensional velocity and/or movement detector

2008-01-08

2008-01-08

Turner, Samuel A. (Department: 2877)

Optics: measuring and testing

By light interference

Having light beams of different frequencies

C356S028500

Reexamination Certificate

active

07317538

ABSTRACT:
In an optical movement information detector, light emitted from a laser diode (1) is split into a first beam (10), a second beam (11) and a third beam (12) by beam splitters (2a,2b). The first, second and third beams are converged by a condenser lens (4) upon a surface of an object to be measured (5) to form a beam spot (13) thereon. Diffused light from the beam spot (13) is received by a photodiode (6) and an output signal of the photodiode (6) is processed by a signal processing circuit (20) including an analog-digital converter (8) and a Fourier transforming unit (9). A detecting section (21) obtains, for example, a moving velocity and a moving direction of the object based on spectrum peak frequencies obtained by the Fourier transform.

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Applied Physics Letters, vol. 4, No. 10, May 15, 2064, pp. 176-178.

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