TRD temperature sensor
Patent 5140609 Issued on August 18, 1992. Estimated Expiration Date: 
September 13, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 13, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethods and devices for the optical measurement of temperature with luminescent materials Method and apparatus for measurement of the fluorescence relaxation period of a fluorescent substance Fluorescent material temperature sensor Lens system for optic temperature sensor Patent #: 5036194 InventorsApplicationNo. 759476 filed on 09/13/1991US Classes:374/101, Composite temperature-related paramenter250/227.27, With coherent interferrometric light250/461.1, With ultraviolet source252/962TEMPERATURE OR THERMAL HISTORYExaminersPrimary: Hellner, MarkAttorney, Agent or FirmInternational ClassG01J 005/02AbstractA temperature sensing system has a signal means which provides a signal representative of a temperature responsive luminescence, where the luminescence has a characteristic time-rate-of-decay. A means for comparison is connected to the signal means and samples the signal during two time intervals, the first interval overlapping the second. The averages of the samples are compared to provide a difference signal representative of the difference between the two measured averages. Control means coupled to the comparison means provide an output representing the temperature as a function of the time-rate-of-decay, by adjusting the overlapping intervals so that the difference signal converges to a preselected limit.Other References
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