Non-contact techniques for measuring temperature or radiation-heated objects
Patent 5154512 Issued on October 13, 1992. Estimated Expiration Date: 
April 10, 2010. 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.
April 10, 2010. 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 References 2709367 3288625 3586851 3686940 Unitary lasser/IR seeker Semiconductor body heater Optical pyrometer and technique for temperature measurement Apparatus for measuring components of liquid samples Reflector for dental, medical or the like lighting device Imaging system for hostile environment optical probe InventorsApplicationNo. 507605 filed on 04/10/1990US Classes:374/9, EMISSIVITY DETERMINATION250/227.14, Condition responsive light guide (e.g., light guide is physically affected by parameter sensed which results in light conveyed to the photocell)374/32, Total radiant energy or power measurement374/126, Having emissivity compensating or specified radiating surface374/129, Comparison with radiation reference standard374/131, With radiation conducting element392/416With chamberExaminersPrimary: Yasich, Daniel M.Attorney, Agent or FirmForeign Patent References
International ClassesG01J 005/10G01N 025/20 H05B 003/62 AbstractA non-contact pyrometric technique is provided for measuring the temperature and/or emissivity of an object that is being heated by electromagnetic radiation within the optical range. The measurement is made at short wavelengths for the best results. The measurement may be made at wavelengths within those of the heating optical radiation, and the resulting potential error from detecting heating radiation reflected from the object is avoided by one of two specific techniques. A first technique utilizes a mirror positioned between the heating lamps and the object, the mirror reflecting a narrow wavelength band of radiation in which the optical pyrometer detector operates. The second technique is to independently measure the a.c. ripple of the heating lamp radiation and subtract the background optical noise from the detected object signal in order to determine temperature and emissivity of the object. Both of these techniques can be combined, if desired.Other References
Field of SearchWith radiation conducting elementOptical system structure (e.g., lens) EMISSIVITY DETERMINATION Having emissivity compensating or specified radiating surface Having significant signal handling circuitry (e.g., linearizing, emissivity compensation) Sensor or mounting temperature control Including heat energy reflecting or directing means Comprising variable resistance means Infrared responsive Locating infrared emissive objects Plural color responsive TESTING OF APPARATUS HAVING SIGNIFICANT INFRARED OR ULTRAVIOLET PROPERTY Multilayer filter or multilayer reflector SURGICAL OR DENTAL SPOTLIGHT With chamber | |
