Temperature sensor and method
First Claim
Patent Images
1. A temperature sensor for a layered structure, comprising:
- a pyrometer; and
an absorptance detector coupled to said pyrometer, said detector determining emissivity of a layered structure based on layer thickness measurements;
wherein said absorptance detector provides an emissivity correction for said layered structure to said pyrometer.
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Abstract
A direct, noncontact temperature sensor includes an ellipsometer (104-106) to determine absorptance for layered structures and a pyrometer (102) to determine emissive power and combines the two measurements to determine temperature.
63 Citations
15 Claims
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1. A temperature sensor for a layered structure, comprising:
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a pyrometer; and an absorptance detector coupled to said pyrometer, said detector determining emissivity of a layered structure based on layer thickness measurements; wherein said absorptance detector provides an emissivity correction for said layered structure to said pyrometer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A temperature sensor, comprising:
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a pyrometer with a passband filter centered at wavelength λ
0 ;an ellipsometer with detection bands centered at wavelengths λ
1, λ
2, . . . λ
N, with N≧
2; anda controller with inputs coupled to outputs of said pyrometer and said ellipsometer and outputting a temperature, said controller programmable to compute absorptance based on layer thickness measurement outputs of said ellipsometer and apply the absorptance as a correction to the output of said pyrometer. - View Dependent Claims (10, 11, 12, 13)
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14. A method of temperature sensing of a non-metal layered structure, comprising the steps off:
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determining the absorptance of a non-metal layered structure by ellipsometry based on layer thickness measurements with said non-metal layered structure including at a surface at least one layer of known materials; determining an emissive power at said surface of said non-metal layered structure by pyrometry; and computing the temperature from said emissive power and said absorptance. - View Dependent Claims (15)
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Specification