Method and apparatus for sensing or determining one or more properties or the identity of a sample
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United States of America Patent
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Dec 5, 1989
Grant Date -
N/A
app pub date -
Jan 16, 1987
filing date -
Jan 17, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In the method and apparatus, optimum correlation between measured and known values of transmittance or reflectance determines the property or identity of a sample. Three or more discrete radiation components can be selected which are transmitted or reflected by relatively different amounts due to interference, absorption or scatter, thereby enabling fewer radiation components to be used to provide an accurate result. The known values can be derived by analogue or digital techniques, the digital technique employing a model or models taking account of absorption, interference and/or scatter. Techniques are disclosed for reducing computing time by range ajustment, identification of a zero correlation value in a differential function of the model or models and computation of correlation coefficients for two or more groups of radiation components.
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