RADIATION THERMOMETER - CITIZEN WATCH CO LTD

Title:

RADIATION THERMOMETER

Document Type and Number:

WIPO Patent Application WO/1998/020790

Kind Code:

A1

Abstract:

A light guide tube (15) which guides an infrared radiation from a measured object, a 1st infrared sensor (10) which detects the infrared radiation from the light guide tube (15), a temperature sensor (12) which generates a reference temperature signal, a reference cavity (17) which shows a temperature status approximately the same as the temperature status of the light guide tube (15) and is closed so as to prevent the incidence of an external infrared radiation, a 2nd infrared sensor (11) which detects an infrared radiation from the reference cavity (17), a temperature calculating means (13) which calculates the temperature of the object in accordance with the signals from the 1st infrared sensor (10), the 2nd infrared radiation sensor (11) and the temperature sensor (12) and a display (14) which displays the temperature in accordance with a signal from the temperature calculating means (13) are provided. The diameter of at least one of the light guide tube (15) and the reference cavity (17) is gradually reduced from the side of the 1st and 2nd infrared sensors (10 and 11) toward the light incidence opening of the light guide tube (15).

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Inventors:

EGAWA SHUNJI (JP)

Application Number:

PCT/JP1997/003977

Publication Date:

May 22, 1998

Filing Date:

October 31, 1997

Export Citation:

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Assignee:

CITIZEN WATCH CO LTD (JP)
EGAWA SHUNJI (JP)

International Classes:

G01J5/00; A61B5/01; G01J5/02; G01J5/04; G01J5/54; G01K13/00; (IPC1-7): A61B5/00

Foreign References:

JPH08191800A	1996-07-30
JPH07184866A	1995-07-25
JPH07294117A	1995-11-10

Other References: