Method for eliminating internal reflection of range finding...

Details Method for eliminating internal reflection of range finding... Method for eliminating internal reflection of range finding...

2008-02-26

2009-10-06

Tarcza, Thomas H (Department: 3662)

Optics: measuring and testing

Range or remote distance finding

With photodetection

C356S005010, C359S399000

Reexamination Certificate

active

07599045

ABSTRACT:
A method for eliminating internal reflection signal in a range finding system is disclosed, including the steps of receiving a range-finding signal reflected by an object and an internal reflection signal caused by internal reflection of the range finding system, converting the range finding signal and internal reflection signal, as a combination, into an electrical current signal, cropping the electrical current signal in a time interval for the electrical current signal to pass so as to generate a first electrical signal indicating the internal reflection signal, and subtracting the first electrical signal from the current signal to provide a second electrical signal representing the range-finding signal reflected by the object.

REFERENCES:
patent: 5430290 (1995-07-01), Merle et al.
patent: 5771623 (1998-06-01), Pernstich et al.
patent: 6512574 (2003-01-01), Lai et al.
patent: 2006/0181694 (2006-08-01), Hung

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