Title:
光計測装置、シンチレーションカウンタ、パーティクルカウンタ、光計測方法、シンチレーション計数方法及び粒子計数方法
Document Type and Number:
Japanese Patent JP4040789
Kind Code:
B2
Abstract:
A liquid scintillation counter 10 serving as an optical measurement apparatus includes: an HPD 24, a charge amplifier 26, a voltage amplifier 28, a comparator 30, a counter 32, a multi-channel analyzer 34, a display 38, and the like. The HPD 24 has a photocathode 24 a and an APD 24 b for outputting a signal that corresponds to the number of incident photons. The comparator 30 outputs a logic pulse signal, serving as a comparison result signal, only when the signal outputted from the HPD 24 and amplified by the charge amplifier 26 and voltage amplifier 28 is 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 photocathode 24 a and smaller than another output signal that is outputted when two or more photoelectrons are emitted.
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Inventors:
Suyama Motohiro
Katsuhiko Kawai
Morita Tetsuya
Koichiro Ohba
Katsuhiko Kawai
Morita Tetsuya
Koichiro Ohba
Application Number:
JP8383999A
Publication Date:
January 30, 2008
Filing Date:
March 26, 1999
Export Citation:
Assignee:
Hamamatsu Photonics Co., Ltd.
International Classes:
G01J1/18; G01J1/42; G01J11/00; G01N21/64; G01N1/02; G01N15/06; G01N15/14; G01T1/17; G01T1/204; G01T1/208; H01J40/02; H01J43/12; H01J43/30; H01L27/144; H01L31/10; H01L31/101; H01L31/107
Domestic Patent References:
| JP9196752A | ||||
| JP11037851A | ||||
| JP63198830A | ||||
| JP5072113A | ||||
| JP2001004443A | ||||
| JP2001004445A | ||||
| JP2000275101A |
Attorney, Agent or Firm:
Yoshiki Hasegawa
Tatsuya Shioda
Shiro Terasaki
Tatsuya Shioda
Shiro Terasaki