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:
Aug. 31, 2010
Filed:
Mar. 01, 2006
Kiyoshi Kurosawa, Tokyo, JP;
Kazuomi Shirakawa, Tokyo, JP;
Kiyoshi Kurosawa, Tokyo, JP;
Kazuomi Shirakawa, Tokyo, JP;
The Tokyo Electric Power Company, Incorporated, Tokyo, JP;
Abstract
A simple constitution together with an easy calibration of output by realizing a fast light intensity detection method is realized without using the carrier signal. An optical sensor, including: a sensor to which light from a light source is lead, and by which light intensity of the light is modulated based on a physical value; light receiving elementsandreceiving two elements of divided light PA and PB having polarized waves which are orthogonally crossing each other; a variable optical attenuator operating light which is received by the light receiving elementsand; and a variable amplifier operating output signals from the light receiving elementsand, wherein both a zero point of a sensor output and sensitivity are calibrated based on a light attenuation factor or an amplification factor which is adjusted when a physical value is detected by calculating a ratio between a sum and a difference of outputs of the light receiving elementsand