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:
Feb. 16, 1993
Filed:
Oct. 30, 1991
Katsuharu Iwamoto, Yokohama, JP;
Osamu Kawakami, Yokosuka, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A laser Doppler velocimeter which has an optical system using a semiconductor laser as a light source for receiving a scattered light by reflection from natural particulate in fluid to be measured passing interference fringes formed in a region to be measured by a semiconductor optical detector, and a signal processor having a converter for converting a Doppler signal from the semiconductor optical detector to a predetermined waveform (e.g., a square wave) according to at least two different threshold values, and an arithmetic unit for comparing the processed signals from each other to judge that the scattered signal is from one natural particulate or not (i.e., the propriety of its measuring accuracy) and to calculate the velocity of the fluid to be measured according to the judged result and the process result of the converter from the period of the square wave when judging 'a normal measurement'.