Radiation thermometer

• US 7,434,992 B2
• Filed: 06/25/2004
• Issued: 10/14/2008
• Est. Priority Date: 06/13/2000
• Status: Expired due to Fees

• Current Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Original Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Inventors: Sato, Tetsuya, Tabata, Makoto, Ota, Hiroyuki, Onishi, Yoshihide, Sato, Taiga, Ogura, Yoshihiko
• Primary Examiner(s): Verbitsky; Gail
• Assistant Examiner(s): Jagan; Mirellys
• Application Number:
  US10/875,682
• Publication Number:
  US 20040233968A1
• Time in Patent Office: 1,572 Days
• Field of Search: 374/121, 374/130, 374/131, 374/132, 374/133, 374/208, 374/169, 374/134, 374/137, 600/474
• US Class Current: 374/132
• CPC Class Codes: A61B 5/01 Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue clinical contact thermometers G01K13/20
• CPC Class Codes: G01J 5/02 Constructional details
• CPC Class Codes: G01J 5/021 Probe covers for thermometers, e.g. tympanic thermometers; Containers for probe covers; Disposable probes
• CPC Class Codes: G01J 5/025 Interfacing a pyrometer to an external device or network; User interface
• CPC Class Codes: G01J 5/026 Control of working procedures of a pyrometer, other than calibration; Bandwidth calculation; Gain control
• CPC Class Codes: G01J 5/04 Casings
• CPC Class Codes: G01J 5/045 Sealings; Vacuum enclosures; Encapsulated packages; Wafer bonding structures; Getter arrangements getter arrangements per se H01L23/26 and H01L21/3221
• CPC Class Codes: G01J 5/049 Casings for tympanic thermometers
• CPC Class Codes: G01J 5/05 Means for preventing contamination of the components of the optical system; Means for preventing obstruction of the radiation path
• CPC Class Codes: G01J 5/064 Ambient temperature sensor; Housing temperature sensor; Constructional details thereof
• CPC Class Codes: G01J 5/12 using thermoelectric elements, e.g. thermocouples
• CPC Class Codes: G01J 5/16 Arrangements with respect to the cold junction; Compensating influence of ambient temperature or other variables
• CPC Class Codes: G01J 5/53 Reference sources, e.g. standard lamps; Black bodies
• CPC Class Codes: G01J 5/70 Passive compensation of pyrometer measurements, e.g. using ambient temperature sensing or sensing of temperature within housing

Abstract

A first thermistor 8 and a second thermistor 9 are arranged forwardly and rearwardly of a thermopile sensor 5. A thermopile chip 55 is arranged and interposed between the first thermistor 8 and an integrated thermistor 57. A sensor cover is mounted in contact with front and side portions of a can portion 59 of a thermopile casing 56. A temperature or a radiant quantity of infrared rays on the front portion of the can portion is estimated from a temperature change of the integrated thermistor per second.

Claims

1. A radiation thermometer, comprising:

an infrared-ray sensor for measuring a quantity of infrared rays irradiated from an object being measured;

sensor-temperature measuring means for measuring a temperature of the infrared-ray sensor;

temperature calculating means for calculating a temperature of the object being measured, on the basis of a quantity of infrared rays irradiated from the object being measured, and a temperature of the infrared-ray sensors;

an infrared-ray sensor receiving member for receiving the infrared-ray sensor which comprises an object-side portion facing a side of the object being measured, relative to the infrared-ray sensor, and

temperature-distribution measuring means for measuring a temperature distribution of the object-side portion,

wherein the temperature calculating means has the further functions of calculating a quantity of infrared rays irradiated from the object-side portion on the basis of the temperature distribution measured by the temperature-distribution measuring means and calculates a temperature of the object being measured, on the basis of a quantity of infrared rays irradiated from the object being measured, a temperature of the infrared-ray sensor and the calculated quantity of infrared rays irradiated from the object-side portion.

2. The radiation thermometer according to claim 1, wherein the temperature-distribution measuring means measures a temperature distribution of the object-side portion on the basis of a changed portion of a temperature of the infrared ray sensor per unit time.

3. The radiation thermometer according to claim 1 or 2, further comprising isothermal means for uniformizing a temperature distribution of the object-side portion.

4. The radiation thermometer according to claim 3, wherein the isothermal means comprises a mount portion, to which the object-side portion is mounted.

5. The radiation thermometer according to claim 3, wherein the object-side portion of the infrared-ray sensor receiving member comprises an infrared-ray transmitting portion for transmitting therethrough infrared rays irradiated from the object being measured, and the isothermal means is positioned outside a region where infrared rays irradiated pass through the infrared-ray transmitting portion to be incident upon the infrared-ray sensor.

6. The radiation thermometer according to claim 5, wherein the isothermal means comprises a mount portion, to which the object-side portion is mounted.

7. The radiation thermometer according to claim 3, wherein the isothermal means is formed from a substance of high thermal conductivity and contacts with the object-side portion to cover at least a part thereof.

8. The radiation thermometer according to claim 7, wherein the isothermal means comprises a mount portion, to which the object-side portion is mounted.

9. The radiation thermometer according to claim 7, wherein the object-side portion of the infrared-ray sensor receiving member comprises an infrared-ray transmitting portion for transmitting therethrough infrared rays irradiated from the object being measured, and the isothermal means is positioned outside a region where infrared rays irradiated pass through the infrared-ray transmitting portion to be incident upon the infrared-ray sensor.