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US 10,641,660 B2Granted
Temperature sensor, device using same, and temperature measurement method
AssigneePanasonic Corporation
InventorHiroshi Yamanaka
Life of this patent
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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.
Claims12
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,
- wherein the first infrared measuring unit and the second infrared measuring unit are composed of one infrared sensor,
- wherein the infrared sensor includes a plurality of pixel units arranged two-dimensionally,
- wherein the second voltage is calculated based on voltages of pixel units at four corners of the plurality of pixel units,
- wherein the first voltage is calculated from voltages of pixel units excluding the pixel units at the four corners, and
- wherein the calculating unit calculates the temperature of the object from expression (2),
- T
- obj
- =
- T
- out
- -
- {
- (
- e
- 11
- ·
- T
- amb
- +
- e
- 12
- )
- ·
- A
- 2
- +
- (
- e
- 21
- ·
- T
- amb
- +
- e
- 22
- )
- ·
- A
- +
- (
- e
- 31
- ·
- T
- amb
- +
- e
- 32
- )
- }
- (
- d
- 1
- ·
- A
- 2
- +
- d
- 2
- ·
- A
- +
- d
- 3
- )
- [
- Expression
-
-
- 2
- ]
- where Tobj is the temperature of the object, Tout is the output temperature of the object, Tamb is the ambient temperature of the object, A is a length of one side of the object, A2 is an area of the object, and e11, e12, e21, e22, e31, e32, d1, d2, and d3 are coefficients.
73 more elements
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,
- wherein the first infrared measuring unit and the second infrared measuring unit are composed of one infrared sensor,
- wherein the infrared sensor includes a plurality of pixel units arranged two-dimensionally,
- wherein the second voltage is calculated based on voltages of pixel units at four corners of the plurality of pixel units,
- wherein the first voltage is calculated from voltages of pixel units excluding the pixel units at the four corners, and
- wherein the calculating unit calculates the temperature of the object from expression (2),
- T
- obj
- =
- T
- out
- -
- {
- (
- e
- 11
- ·
- T
- amb
- +
- e
- 12
- )
- ·
- A
- 2
- +
- (
- e
- 21
- ·
- T
- amb
- +
- e
- 22
- )
- ·
- A
- +
- (
- e
- 31
- ·
- T
- amb
- +
- e
- 32
- )
- }
- (
- d
- 1
- ·
- A
- 2
- +
- d
- 2
- ·
- A
- +
- d
- 3
- )
- [
- Expression
-
-
- 2
- ]
- where Tobj is the temperature of the object, Tout is the output temperature of the object, Tamb is the ambient temperature of the object, A is a length of one side of the object, A2 is an area of the object, and e11, e12, e21, e22, e31, e32, d1, d2, and d3 are coefficients.
74 more elements
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,
- wherein the first voltage and the second voltage are output from an infrared sensor,
- wherein the infrared sensor includes a plurality of pixel units disposed two-dimensionally,
- wherein the second voltage is calculated based on voltages of pixel units at four corners of the plurality of pixel units,
- wherein the first voltage is calculated from voltages of pixel units excluding the pixel units at the four corners, and
- wherein the temperature of the object is calculated from expression (2),
- T
- obj
- =
- T
- out
- -
- {
- (
- e
- 11
- ·
- T
- amb
- +
- e
- 12
- )
- ·
- A
- 2
- +
- (
- e
- 21
- ·
- T
- amb
- +
- e
- 22
- )
- ·
- A
- +
- (
- e
- 31
- ·
- T
- amb
- +
- e
- 32
- )
- }
- (
- d
- 1
- ·
- A
- 2
- +
- d
- 2
- ·
- A
- +
- d
- 3
- )
- [
- Expression
-
-
- 2
- ]
- where Tobj is the temperature of the object, Tout is the output temperature of the object, Tamb is the ambient temperature of the object, A is a length of one side of the object, A2 is an area of the object, and e11, e12, e21, e22, e31, e32, d1, d2, and d3 are coefficients.
75 more elements
Dependencies are inferred from the claim text.