Passive remote temperature sensor system
Patent 4246784 Issued on January 27, 1981. Estimated Expiration Date: 
June 1, 1999. 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.
June 1, 1999. 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.InventorApplicationNo. 06/044743 filed on 06/01/1979US Classes:374/117, By a vibratory effect (e.g., resonant frequency, acoustical)374/137, Temperature distribution or profile600/549, Temperature detection600/586Detecting sound generated within bodyExaminersPrimary: Woodiel, Donald O.Attorney, Agent or FirmInternational ClassesG01K 11/00 (20060101)G01K 11/22 (20060101) AbstractPassive non-invasive temperature measurement of the interior of a body is accomplished by using the acoustic thermal noise spectra of the body. One or more acoustic transducers are coupled with the surface of the body to intercept the acoustical noise signal from within the interior of the body along well defined paths to generate a corresponding electrical signal. The noise power spectrum of the electrical signal is analyzed by means of a power spectrum analyzer to develop an output representing the temperature-depth distribution along said paths. The output of the power spectrum analyzer may be displayed and/or recorded or subjected to further signal processing.Other References
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