Temperature sensor and temperature measuring system using the temperature sensor
First Claim
1. A temperature measuring system for the contactless determination of an object temperature of at least a part of an object, comprising:
- a first plate disposed near the object;
a first temperature-sensitive sensor disposed on said first plate for producing a first sensor signal representing a temperature of said first plate;
a second plate spaced from said first plate and disposed near the object;
a second temperature-sensitive sensor disposed on said second plate for producing a second sensor signal representing a temperature of said second plate; and
a control unit receiving the first and second sensor signals and processing the first and second sensor signals in combination with one another to determine the object temperature,wherein said second plate is positioned with respect to said first plate such that if a stable state ratio (To /Tv) between an ambient temperature (To) of the sensor unit and a temperature (Tv) of the object has a numerator and a denominator that differ from one another, an associated ratio (Tp1 /Tp2) between a temperature (Tp1) of the first plate and a temperature (Tp2) of the second plate also has a numerator and a denominator that differ from one another.
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Accused Products
Abstract
The invention relates to a sensor unit and a temperature measuring system that includes the sensor unit for the contactless determination of the object temperature (Tv) of at least a part of an object. The sensor unit is placed near the object and includes a first and second plate. A temperature-sensitive sensor is disposed on each plate to produce first and second sensor signals which represent the temperature of the first and second plates, respectively. The system also includes a control unit which processes the first and second sensor signals in combination for determining the object temperature (Tv). Preferably, the control unit employs a Kalman filter. Also, the temperature measuring system is applied to an image reproduction machine to determine the temperature of a roller or belt.
39 Citations
47 Claims
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1. A temperature measuring system for the contactless determination of an object temperature of at least a part of an object, comprising:
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a first plate disposed near the object; a first temperature-sensitive sensor disposed on said first plate for producing a first sensor signal representing a temperature of said first plate; a second plate spaced from said first plate and disposed near the object; a second temperature-sensitive sensor disposed on said second plate for producing a second sensor signal representing a temperature of said second plate; and a control unit receiving the first and second sensor signals and processing the first and second sensor signals in combination with one another to determine the object temperature, wherein said second plate is positioned with respect to said first plate such that if a stable state ratio (To /Tv) between an ambient temperature (To) of the sensor unit and a temperature (Tv) of the object has a numerator and a denominator that differ from one another, an associated ratio (Tp1 /Tp2) between a temperature (Tp1) of the first plate and a temperature (Tp2) of the second plate also has a numerator and a denominator that differ from one another. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A sensor unit for contactless determination of an object temperature of at least part of an object, comprising:
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a first plate disposed near the object; a first temperature-sensitive sensor disposed on said first plate for producing a first sensor signal representing a temperature of said first plate; a second plate spaced from said first plate and disposed near the object; and a second temperature-sensitive sensor disposed on said second plate for producing a second sensor signal representing a temperature of said second plate, wherein said second plate is positioned with respect to said first plate such that if a stable state ratio (To /Tv) between an ambient temperature (To) of the sensor unit and a temperature (Tv) of the object has a numerator and a denominator that differ from one another, an associated ratio (Tp1 /Tp2) between a temperature (Tp1) of the first plate and a temperature (Tp2) of the second plate also has a numerator and a denominator that differ from one another. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A method for the contactless determination of an object temperature of at least a part of an object, comprising the steps of:
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disposing a first plate near the object; producing a first sensor signal representing a temperature of the first plate; disposing a second plate spaced from the first plate and near the object; producing a second sensor signal representing a temperature of said second plate; and processing the first and second sensor signals in combination with one another to determine the object temperature, wherein the second plate is positioned with respect to the first plate such that if a stable state ratio (T0 /Tv) between an ambient temperature (To) of the sensor unit and a temperature (Tv) of the object has a numerator and a denominator that differ from one another, an associated ratio (Tp1 /Tp2) between a temperature (Tp1) of the first plate and a temperature (Tp2) of the second plate also has a numerator and a denominator that differ from one another. - View Dependent Claims (42, 43, 44, 45, 46, 47)
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Specification