G - Physics – 01 – J
Patent
G - Physics
01
J
73/55
G01J 3/18 (2006.01) G01J 3/42 (2006.01)
Patent
CA 1310508
OPTO-ELECTRONIC METHOD FOR SPECTRAL ANALYSIS ABSTRACT An opto-electronic method for rapid, accurate spectral analysis of the reflectivity or transmissivity of samples is disclosed. A concave, holographic diffraction grating is oscillated at high speed to provide a rapid scanning of monochromatic light through a spectrum of wavelengths, The grating drive system is an electrically driven mechanical oscillator which utilizes the back EMF of the oscillator motor to maintain oscillation at the desired amplitude and frequency. A passive optical shutter mounted to the grating alternatively blocks the light entering and exiting the monochrometer as the grating is oscillated. The resultant dark period is utilized in the method to provide a reference offset value and to control cooling of the detectors. A phase-locked loop circuit provides sample commands at precisely determined intervals to correctly correlate the spectral data with the output of the monochronometer. Source and exit optics are employed to optimally shape the light passing through the system. A detection head allows measurement of both light transmission or reflectance with only slight modification of the system. An optical fiber diverts light from the beam at or near the sample. This light is electronically detected and the electronic detection signal is used to adjust the gain of the sample signal so as to compensate for atmospheric bands, temporal variations, and system response. This provides a true double (dual) beam operation.
546631
Landa Isaac J.
Shideler Ronald
Borden Ladner Gervais Llp
Landa Isaac J.
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