Title:
TEMPERATURE MEASURING INSTRUMENT
Document Type and Number:
Japanese Patent JP3902152
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To detect a failure of an optical sensor to determine the failure in an early stage, in a start-up of a gas turbine and an operation of low rating thereof.
SOLUTION: This instrument is provided with a pyrometer 2 provided to be faced to a temperature-measured part 1, an optical fiber 4 extended from the pyrometer, a photodiode 6 photo-coupled with the optical fiber, an electric current-voltage converter 8 for converting a detected current in the photodiode into a desired voltage suitable for temperature measurement, a voltage amplifier 10 for amplifying at a high magnification an output voltage from the current-voltage converter 8, and a switching circuit 12 for outputting an ON-signal when an amplified voltage in the voltage amplifier exceeds a prescribed threshold value.
Inventors:
Nakajima Takuro
Application Number:
JP2003115308A
Publication Date:
April 04, 2007
Filing Date:
April 21, 2003
Export Citation:
Assignee:
Ishikawajima Harima Heavy Industries Co., Ltd.
International Classes:
G01J5/00; F01D25/00; F02C7/00; F02C9/00; G01J5/10; (IPC1-7): G01J5/10; F01D25/00; F02C7/00; F02C9/00; G01J5/00
Domestic Patent References:
| JP10030966A | ||||
| JP63163125A | ||||
| JP2002512829A | ||||
| JP3070165U |
Attorney, Agent or Firm:
Minoru Hotta