TEMPERATURE SENSOR, DEVICE USING SAME, AND TEMPERATURE MEASUREMENT METHOD

• US 20170160141A1
• Filed: 05/20/2015
• Published: 06/08/2017
• Est. Priority Date: 05/30/2014
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: YAMANAKA, HIROSHI
• Granted Patent: US 10,641,660 B2
• Time in Patent Office: Days
• CPC Class Codes: G01J 2005/066 Differential arrangement, i.e. sensitive/not sensitive
• CPC Class Codes: G01J 2005/106 Arrays
• CPC Class Codes: G01J 2005/528 Periodic comparison
• CPC Class Codes: G01J 5/0003 for sensing the radiant heat transfer of samples, e.g. emittance meter
• 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 5/06 Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity for adjusting of solid angle of collected radiation G01J5/07; means for wavelength selection G01J5/0801
• CPC Class Codes: G01J 5/068 by controlling parameters other than temperature
• CPC Class Codes: G01J 5/0806 Focusing or collimating elements, e.g. lenses or concave mirrors
• CPC Class Codes: G01J 5/0846 having multiple detectors for performing different types of detection, e.g. using radiometry and reflectometry channels
• CPC Class Codes: G01J 5/10 using electric radiation detectors
• CPC Class Codes: G01J 5/12 using thermoelectric elements, e.g. thermocouples
• CPC Class Codes: G01J 5/20 using resistors, thermistors or semiconductors sensitive to radiation, e.g. photoconductive devices
• CPC Class Codes: G01J 5/48 Thermography; Techniques using wholly visual means
• CPC Class Codes: G01J 5/52 using comparison with reference sources, e.g. disappearing-filament pyrometer
• CPC Class Codes: G01J 5/56 Electrical features thereof
• CPC Class Codes: G01J 5/80 Calibration using comparison with reference sources G01J5/52
• CPC Class Codes: G01J 5/804 using atmospheric correction
• CPC Class Codes: G01K 1/20 Compensating for effects of temperature changes other than those to be measured, e.g. changes in ambient temperature
• CPC Class Codes: H04N 23/23 from thermal infrared radiation
• CPC Class Codes: H04N 23/54 Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
• CPC Class Codes: H04N 23/55 : Optical parts specially adapted for electronic image sensors; Mounting thereof
• CPC Class Codes: H04N 5/33 : Transforming infrared radiation cameras or camera modules for generating image signals from infrared radiation H04N23/20; circuitry of SSIS for transforming infrared radiation into image signals H04N25/20

Abstract

A temperature sensor includes a first infrared measuring means, a second infrared measuring means, and a calculating unit. The first infrared measuring means measures infrared rays emitted from an object and outputs a first voltage. The second infrared measuring means measures infrared rays emitted from around the object and outputs a second voltage. The calculating unit calculates the output temperature of the object from the first voltage, calculates the ambient temperature of the object from the second voltage, and corrects the output temperature based on the ambient temperature to calculate the temperature of the object.

Claims

1. A temperature sensor comprising:

a first infrared measuring unit that measures infrared rays emitted from an object and outputs a first voltage;

a second infrared measuring unit that measures infrared rays emitted from around the object and outputs a second voltage; and

a calculating unit that calculates temperature of the object by calculating output temperature of the object from the first voltage, calculating ambient temperature of the object from the second voltage, and correcting the output temperature based on the ambient temperature.

2. The temperature sensor of claim 1, wherein the first infrared measuring unit and the second infrared measuring unit are composed of one infrared sensor.

3. The temperature sensor of claim 2,

wherein the infrared sensor includes a plurality of pixel units arranged two-dimensionally,

wherein the second voltage is calculated from voltages of pixel units at four corners of the plurality of pixel units, and

wherein the first voltage is calculated from voltages of pixel units excluding the pixel units at the four corners.

4. The temperature sensor of claim 2,

wherein the infrared sensor includes a plurality of pixel units disposed one-dimensionally,

wherein the second voltage is calculated from voltages at pixel units of both ends among the plurality of pixel units, and

wherein the first voltage is calculated from voltages at pixel units excluding the pixel units at both ends among the plurality of pixel units.

5. The temperature sensor of claim 1, wherein the calculating unit corrects the output temperature based on a size of the object in addition to the ambient temperature.

6. The temperature sensor of claim 5, further comprising an object size obtaining unit for measuring the size of the object.

7. The temperature sensor of claim 1, wherein the calculating unit calculates the temperature of the object from expression (1),

8. The temperature sensor of claim 1, wherein the calculating unit calculates the temperature of the object from expression (2),

9. A device comprising:

a first infrared measuring unit that measures infrared rays emitted from an object and outputs a first voltage;

a second infrared measuring unit that measures infrared rays emitted from around the object and outputs a second voltage;

a calculating unit that calculates temperature of the object and outputs the temperature as a corrected signal by calculating output temperature of the object from the first voltage, calculating ambient temperature of the object from the second voltage, and correcting the output temperature based on the ambient temperature; and

an operating unit that operates based on the corrected signal from the calculating unit.

10. A method of measuring temperature of an object, comprising:

measuring infrared rays emitted from the object and outputting a first voltage;

measuring infrared rays emitted from around the object and outputting a second voltage;

calculating output temperature of the object from the first voltage;

calculating ambient temperature of the object from the second voltage; and

calculating temperature of the object by correcting the output temperature based on the ambient temperature.

11. The method of measuring temperature of an object of claim 10, wherein the first voltage and the second voltage are output from an infrared sensor.

12. The method of measuring temperature of an object of claim 11,

wherein the infrared sensor includes a plurality of pixel units disposed two-dimensionally,

wherein the second voltage is calculated from voltages of pixel units at four corners of the plurality of pixel units, and

wherein the first voltage is calculated from voltages of pixel units excluding the pixel units at the four corners.

13. The method of measuring temperature of an object of claim 11,

wherein the infrared sensor includes a plurality of pixel units disposed one-dimensionally,

wherein the second voltage is calculated from voltages of pixel units at both ends of the plurality of pixel units, and

wherein the first voltage is calculated from voltages of pixel units excluding the pixel units at both ends of the plurality of pixel units.

14. The method of measuring temperature of an object of claim 10, wherein the output temperature is corrected based on a size of the object in addition to the ambient temperature.

15. The method of measuring temperature of an object of claim 14, further comprising measuring the size of the object.

16. The method of measuring temperature of an object of claim 10, wherein the temperature of the object is calculated from expression (1),

17. The method of measuring temperature of an object of claim 10, wherein the temperature of the object is calculated from expression (2),