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. 27, 2013
Filed:
May. 31, 2011
Applicants:
Tetsu Murayama, Yokohama, JP;
Moriyasu Ichino, Yokohama, JP;
Inventors:
Tetsu Murayama, Yokohama, JP;
Moriyasu Ichino, Yokohama, JP;
Assignee:
Sumitomo Electric Device Innovations, Inc., Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01J 1/42 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method to monitor an output of an APD is disclosed. The method includes steps of, (a) measuring dark currents of the APD at several temperatures in advance to a practical operation of the APD, (b) measuring an output current of the APD by illuminating the APD practically at a measured temperature, (c) estimating a dark current at the measured temperature from measured dark currents, and (d) subtracting the estimated dark current from the output current.