OPTICAL MEASUREMENT APPARATUS AND METHOD FOR OPTICAL MEASUREMENT

Title:

OPTICAL MEASUREMENT APPARATUS AND METHOD FOR OPTICAL MEASUREMENT

Document Type and Number:

WIPO Patent Application WO/2002/027283

Kind Code:

A1

Abstract:

A liquid scintillation counter (10), which is an optical measurement apparatus, is provided with an HPD (24), a charge amplifier (26), a voltage amplifier (28), a comparator (30), a counter (32), a multi-channel analyzer (34), a CPU (36), and a display (38). The HPD (24) has a photo-cathode (24a) and an APD (24b) and outputs a signal that corresponds to the number of incident photons. The comparator (30) outputs a logic pulse signal, which is a comparison result signal, only when the output signal outputted from the HPD (24) and amplified by the charge amplifier (26) and the voltage amplifier (28) exceeds a specified threshold value. The threshold value is larger than the output signal of when one photoelectron is emitted from the photo-cathode (24a) and smaller than the output signal of when two photoelectrons are emitted.

Inventors:

SUYAMA MOTOHIRO (JP)
KAWAI YOSHIHIKO (JP)
MORITA TETSUYA (JP)
OBA KOICHIRO (JP)

Application Number:

PCT/JP2000/006561

Publication Date:

April 04, 2002

Filing Date:

September 25, 2000

Export Citation:

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Assignee:

HAMAMATSU PHOTONICS KK (JP)
SUYAMA MOTOHIRO (JP)
KAWAI YOSHIHIKO (JP)
MORITA TETSUYA (JP)
OBA KOICHIRO (JP)

International Classes:

G01J1/18; G01J1/42; G01J11/00; G01N1/02; G01N15/06; G01N15/14; G01T1/167; G01T1/17; G01T1/204; G01N21/64; G01T1/208; H01J40/02; H01J43/12; H01J43/30; H01L27/144; H01L31/10; H01L31/101; H01L31/107; G01N15/02; (IPC1-7): G01J1/42; G01J11/00; G01T1/204; G01T1/208; G01N1/02; G01N15/06; H01L31/10; H01J40/02; H01J43/12; H01J43/30

Foreign References:

JPH1137851A	1999-02-12
EP0953837A1	1999-11-03
JPH09196752A	1997-07-31
JPH04184291A	1992-07-01
JPH0572113A	1993-03-23
JP2000275102A	2000-10-06

Other References: