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:
Nov. 01, 2005
Filed:
Sep. 25, 2000
Motohiro Suyama, Hamamatsu, JP;
Yoshihiko Kawai, Hamamatsu, JP;
Tetsuya Morita, Hamamatsu, JP;
Koichiro Oba, Hamamatsu, JP;
Motohiro Suyama, Hamamatsu, JP;
Yoshihiko Kawai, Hamamatsu, JP;
Tetsuya Morita, Hamamatsu, JP;
Koichiro Oba, Hamamatsu, JP;
Hamamatsu Photonics K.K., Hamamatsu, JP;
Abstract
A liquid scintillation counterserving as an optical measurement apparatus includes: an HPDa charge amplifiera voltage amplifiera comparatora countera multi-channel analyzera displayand the like. The HPDhas a photocathodeand an APDfor outputting a signal that corresponds to the number of incident photons. The comparatoroutputs a logic pulse signal, serving as a comparison result signal, only when the signal outputted from the HPDand amplified by the charge amplifierand voltage amplifieris larger than a prescribed threshold value. This threshold value is set larger than an output signal that is outputted when a single photoelectron is emitted from the photocathodeand smaller than another output signal that is outputted when two or more photoelectrons are emitted.