Two-color radiation thermometer

• US 7,114,846 B2
• Filed: 04/02/2004
• Issued: 10/03/2006
• Est. Priority Date: 04/18/2003
• Status: Expired due to Fees

• Current Assignee: Shimadzu Corporation
• Original Assignee: Shimadzu Corporation
• Inventors: Kondo, Yasushi, Tominaga, Hideki, Ohkubo, Kunihiko
• Primary Examiner(s): VERBITSKY, GAIL KAPLAN
• Application Number:
  US10/815,922
• Publication Number:
  US 20040208223A1
• Time in Patent Office: 914 Days
• Field of Search: 374/120, 374/121, 374/130, 374/131, 374/132, 374/208, 250/330, 250/336.1, 250/338.1, 250/338.3, 250/339.02, 250/339.06, 250/339.11, 250/341.3, 250/341.8
• US Class Current: 374/121
• CPC Class Codes: G01J 5/58 using absorption; using extinction effect
• CPC Class Codes: G01J 5/602 using selective, monochromatic or bandpass filtering

Abstract

A two-color radiation thermometer includes an image pickup device having micro photo receiving units arranged two-dimensionally; a light diverging device for diverging incident light coming from a measuring object into two paths and irradiating the light on two different areas on a two-dimensional light receiving surface of the image pickup device; a wavelength limitation device for limiting wavelengths of the light irradiated on the two different areas to first and second wavelengths, respectively; and a temperature calculation device. The calculation device receives image signals corresponding to the first and second wavelengths respectively from the micro photo receiving units located at the two different areas, and calculates the temperature of the measuring object based on the two image signals.

Claims

1. A two-color radiation thermometer for measuring a temperature of an object, comprising:

only one image pickup device having a light receiving surface with a plurality of micro photo receiving elements arranged two-dimensionally, said light receiving surface having a first area and a second area, wherein said only one image pickup device is one CCD image sensor,

light diverging means for selecting a first spectrum and a second spectrum, and guiding light radiated from the object in the first spectrum toward the first area, and guiding light radiated from the object in the second spectrum toward the second area,

a wavelength limitation device formed at a front side of the image pickup device for selecting first and second wavelengths of the light irradiated on the first area and the second area, and

temperature calculation means electrically connected to the image pickup device, said temperature calculation means receiving a first image signal corresponding to the first wavelength from the micro photo receiving elements located in the first area and a second image signal corresponding to the second wavelength from the micro photo receiving elements located in the second area, and calculating the temperature of the object based on the first and second image signals.

2. A two-color radiation thermometer according to claim 1, wherein said light diverging means is a prism.

3. A two-color radiation thermometer according to claim 1, wherein said light diverging means includes a first polarizing beam splitter for guiding the light with a first polarized light wave toward the first area and a second polarizing beam splitter for guiding the light with a second polarized light wave toward the second area.

4. A two-color radiation thermometer according to claim 3, wherein said wavelength limitation device further includes a first wavelength filter for guiding the first polarized light toward the first area and a second wavelength filter for guiding the second polarized light toward the second area.