Title:
APPARATUS FOR DETECTING LUMINOUS ENERGY
Document Type and Number:
WIPO Patent Application WO/2001/035063
Kind Code:
A1
Abstract:
The current signal from the anode (12) of a photomultiplier tube (10) is converted into a voltage signal (V1) by a current-to-voltage converter (30), and the voltage signal (V1) is compared with a reference signal (V0) by a comparator (50). When the received luminous energy is smaller than a predetermined quantity, the comparator (50) judges that the voltage signal (V1) is smaller than the reference voltage (V0), and a power source (60) applies a constant voltage to the photomultiplier tube (10). A signal processor (80) calculates the received luminous energy based on the voltage signal (V1). When the received luminous energy is greater than a predetermined quantity, the comparator (50) judges that the voltage signal (V1) is greater than the reference voltage (V0), and the power source (60) applies such a voltage to the photomultiplier tube (10) that the voltage signal (V1) approaches the reference voltage (V0). A buffer (70) amplifies the output signal from the comparator (50), and the signal processor (80) calculates the received luminous energy based on the voltage signal (V2) output from the buffer.
Inventors:
KOIKE TAKASHI (JP)
ITO TOYOSHI (JP)
ITO TOYOSHI (JP)
Application Number:
PCT/JP1999/006282
Publication Date:
May 17, 2001
Filing Date:
November 11, 1999
Export Citation:
Assignee:
HAMAMATSU PHOTONICS KK (JP)
KOIKE TAKASHI (JP)
ITO TOYOSHI (JP)
KOIKE TAKASHI (JP)
ITO TOYOSHI (JP)
International Classes:
G01J1/42; H01J43/30; (IPC1-7): G01J1/42; H01J43/30; H01L31/00
Domestic Patent References:
| WO1983002323A1 | 1983-07-07 |
Foreign References:
| JPH11329340A | 1999-11-30 | |||
| JPS4937231Y1 | 1974-10-11 | |||
| JPH0961537A | 1997-03-07 | |||
| JPS4979575A | 1974-08-01 | |||
| JPS56174049U | 1981-12-22 |
Attorney, Agent or Firm:
Hasegawa, Yoshiki (Ginza 2-chome Chuo-ku Tokyo, JP)
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