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. 19, 2009
Filed:
Mar. 21, 2006
Norihiko Nishizawa, Nagoya, JP;
Toshio Goto, Nisshin, JP;
Norihiko Nishizawa, Nagoya, JP;
Toshio Goto, Nisshin, JP;
National University Corporation Nagoya University, Nagoya-shi, JP;
Abstract
A distance measurement device that provides high speed and accuracy. A light divider separates pulsed light emitted from an ultrashort pulse fiber laser into reference light A and signal light. A scanning mirror unit irradiates an object with the signal light and receives scattered light B, which is reflected from the object. An optical path length adjustment unit adjusts an optical path length of the reference light A. A differential detector detects the degree of interference of the reference light A having the adjusted optical path length with the scattered light B and outputs the detected degree of interference as an interference signal. A computer specifies an adjustment value, set in the optical path length adjustment unit, to attain a specific optical path length maximizing the interference signal and uses the specified adjustment value to compute the distance from the scanning mirror unit to the object.