The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 16, 2006
Filed:
Jan. 12, 2004
Pie-yau Chien, Taichung Hsien, TW;
Dong Huang, Hang-Zhou, CN;
Kuo-hua Yang, Taichung Hsien, TW;
Dan Duan, Hang-Zhou, CN;
Pie-Yau Chien, Taichung Hsien, TW;
Dong Huang, Hang-Zhou, CN;
Kuo-Hua Yang, Taichung Hsien, TW;
Dan Duan, Hang-Zhou, CN;
Asia Optical Co., Inc., T.E.P.E., TW;
Abstract
An apparatus for precise distance measurement has a multiple frequency generator, a laser transmitter, an optical receiver, a first measuring unit, a second measuring unit and a central processing unit. The laser transmitter outputs a light signal to a target, and the optical receiver receives the reflected light signal and mixes the base frequency signal from the multiple frequency generator and the reflected light signal and further outputs an measurement signal to the first and second measuring units. The first and second measuring units calculate respectively a time difference and a phase difference between the light signal and the reflected light signal. The central processing unit is connected to the first and second measuring units to calculate a precise distance by the time and the phase difference.