Thermal measuring and testing – Temperature measurement – Nonelectrical – nonmagnetic – or nonmechanical temperature...
Reexamination Certificate
2006-02-21
2006-02-21
Gutierrez, Diego (Department: 2859)
Thermal measuring and testing
Temperature measurement
Nonelectrical, nonmagnetic, or nonmechanical temperature...
C374S127000, C374S130000, C356S491000, C356S453000
Reexamination Certificate
active
07001068
ABSTRACT:
Remote sensing of the temperature of a greybody or blackbody radiator is effected by passing its radiation (24) through a modulated infrared filter spectrometer. The infrared filter comprises, in sequence, a band pass filter (20), a first polariser (21) which polarises the radiation, an electro-optical element (22) which splits the polarised radiation into two orthogonally polarised components, and a second polariser (23). A lens (28) images the radiation leaving the second polariser onto a detector (27). The electrical signal from the detector (27) is input to a numerical analyser. The electro-optical element (22), typically comprising a birefringent crystal assembly (25) and a birefringent trim plate (26), is configured so that the net optical delay of the orthogonally polarised components passed through it is such that the recombined components are at or near a peak or trough in their interferogram. A sinusoidally varying voltage is applied to the electro-optical element to modulate the net delay of the components passed through the electro-optical element. The numerical analyser is programmed to compute the harmonic amplitude ratio (the ratio of signal amplitudes at the fundamental and second harmonic of the frequency of the modulating voltage) of the signal that it receives from the detector (27). The harmonic amplitude ratio is a function of the temperature of the radiator, which can be estimated by reference to a calibration look-up table.
REFERENCES:
patent: 4905169 (1990-02-01), Buican et al.
patent: 4970385 (1990-11-01), Tatsuno et al.
patent: 5053617 (1991-10-01), Kakizaki et al.
patent: 5245408 (1993-09-01), Cohen
patent: 5841536 (1998-11-01), Dimmick
patent: 6111416 (2000-08-01), Zhang et al.
patent: 6519040 (2003-02-01), Amos
patent: WO 99/04229 (1999-01-01), None
P. C. Dufour et al., “Fourier-transform radiation thermometry: Measurements and uncertainties,” Applied Optics 37(25):5923-5931, Sep. 1998.
J. Howard et al., “Optical coherence techniques for plasma spectroscopy (invited),” Review of Scientific Instruments 72(1):888-897, Jan. 2001.
J. Howard, “Electro-optically modulated polarizing Fourier-transform spectrometer for plasma spectroscopy applications,” Applied Optics 41(1):197-208, Jan. 2002.
Greenlee Winner and Sullivan P.C.
Gutierrez Diego
Jagan Mirellys
The Australian National University
LandOfFree
Method and apparatus for the estimation of the temperature... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for the estimation of the temperature..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for the estimation of the temperature... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3670221