Thermal measuring and testing – Temperature measurement – In spaced noncontact relationship to specimen
Patent
1997-01-27
2000-01-11
Gutierrez, Diego
Thermal measuring and testing
Temperature measurement
In spaced noncontact relationship to specimen
374128, 374133, 374130, G01J 508, G01J 562
Patent
active
060128402
ABSTRACT:
This invention is a fiber-based multi-color pyrometry set-up for real-time non-contact temperature and emissivity measurement. The system includes a single optical fiber to collect radiation emitted by a target, a reflective rotating chopper to split the collected radiation into two or more paths while modulating the radiation for lock-in amplification (i.e., phase-sensitive detection), at least two detectors possibly of different spectral bandwidths with or without filters to limit the wavelength regions detected and optics to direct and focus the radiation onto the sensitive areas of the detectors. A computer algorithm is used to calculate the true temperature and emissivity of a target based on blackbody calibrations. The system components are enclosed in a light-tight housing, with provision for the fiber to extend outside to collect the radiation. Radiation emitted by the target is transmitted through the fiber to the reflective chopper, which either allows the radiation to pass straight through or reflects the radiation into one or more separate paths. Each path includes a detector with or without filters and corresponding optics to direct and focus the radiation onto the active area of the detector. The signals are recovered using lock-in amplification. Calibration formulas for the signals obtained using a blackbody of known temperature are used to compute the true temperature and emissivity of the target. The temperature range of the pyrometer system is determined by the spectral characteristics of the optical components.
REFERENCES:
patent: 3261257 (1966-07-01), Pfister
patent: 3444739 (1969-05-01), Theharne
patent: 3619059 (1971-11-01), Muller et al.
patent: 3672217 (1972-06-01), Naya et al.
patent: 3715922 (1973-02-01), Menge
patent: 3759102 (1973-09-01), Murray
patent: 4301682 (1981-11-01), Everest
patent: 4326798 (1982-04-01), Kahn
patent: 4458147 (1984-07-01), Vogl et al.
patent: 4470710 (1984-09-01), Crane et al.
patent: 4575259 (1986-03-01), Bacci et al.
patent: 4619533 (1986-10-01), Lucas et al.
patent: 4679934 (1987-07-01), Ganguly et al.
patent: 4815841 (1989-03-01), Bickler et al.
patent: 4907895 (1990-03-01), Everest
patent: 5317656 (1994-05-01), Moslehi et al.
patent: 5564830 (1996-10-01), Bobel et al.
patent: 5573339 (1996-11-01), Woskow
Eyal. O. et al., Temperature Measurements Utilizing Two-Bandpass Fiber Optic Radiometry. Optic Engineering 1995, vol. 34 No. 2, pp. 470-473, Feb. 1995.
Small IV W, et al., Laser Tissue Welding Mediated With A Protein Solder. SPIE. 1996, vol 2671, pp. 256-260, May 1969.
J. Brownson, K. Gronokowski, E. Meada, "Two-Color Imaging Radiometry for Pyrotechnic Diagnostics," Thermosense IX, Proc. SPIE vol. 780 pp. 194-201 (1987).
A. S. Tenney, Radiation Ratio Thermometry, Theory and Practice of Radiation Thermometry. D. P. Dewitt and G. D. Nutter (eds.). New York: John Wiley and Sons, Inc., pp. 459-494, 1988.
X.Maldague and M. Dufour, "Dual imager and its applications to active vision robot welding, surface inspection, and two-color pyrometry," Optical Engineering vol. 20 No. 8, pp. 872-880, Aug. 1989.
Gang He and Maraek T. Wlodarczyk, "Dual-Wavelength Fiber Optic Temperature Sensor," Fiber Optic and Laser Sensors XI, Proc. SPIE vol. 2070, pp. 464-471, 1993.
Zhiquan Li, Jinglin Tang, Xiangchun Han, and Ming Zhang, "Two-Color ratio pyrometer with optical fibre for over-heating gas," Fiber Optic and Laser Sensors XI, Proc. SPIE vol. 2070, pp.508-513, 1993.
Ophir Eyal and Abraham Katzir, "Temperature measurements utilizing two-bandpass fiber optic radiometry," Optical Engineering vol. 34 No. 2, pp. 470-473, (Feb. 1995).
U. Anselmi-Tamburini et al, "A two-color spatial-scanning pyrometer for the determination of temperature profiles in combustion synthesis reactions," Rev Sci Instrum vol 66 No. 10, pp. 5006-5014, Oct. 1995.
Ward Small IV et al, "Laser tissue welding mediated with a protein solder," Laser Welding: Control, Delivery Systems, and Clinical Applications, SPIE vol. 2671, pp. 256-260, 1996.
Yair Dankner, O. Eyal, and A. Katzir, "Two-bandpass fiber-optic radiometry for monitoring the temperature of photoresist during dry processing," Appl. Phys. Letters vol. 68 No. 18, pp. 2583-2585, apr. 1996.
Celliers Peter
Small IV Ward
Fernandez Maria
Gutierrez Diego
The Regents of the University of California
Wooldridge John P.
LandOfFree
Single-fiber multi-color pyrometry does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Single-fiber multi-color pyrometry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Single-fiber multi-color pyrometry will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1457244