Boots – shoes – and leggings
Patent
1981-03-06
1984-06-05
Chin, Gary
Boots, shoes, and leggings
364551, 356323, 356325, G01J 342
Patent
active
044532253
ABSTRACT:
The accuracy of the ratio between two time-varying quantities represented by electrical signals, such as the sample transmission (or absorption) signal and the reference signal in a double-beam, ratio-recording, infrared spectrophotometer, is impaired if the electrical signals are subject to inconstant phase shifts. The present invention counteracts the effect of phase shift variations, whatever their origin, by alternately reversing the order in which an elemental component of one quantity is made to occur with respect to an elemental component of the other quantity so that the said effect reverses in sign when the order is reversed and substantially cancels out when the respective elemental portions are combined to form the numerator and the denominator of the ratio. The invention is particularly described with reference to a spectrophotometer of the type referred to.
REFERENCES:
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patent: 4306295 (1981-12-01), Caroc
Chin Gary
Grimes E. T.
Hays R. A.
Masselle F. L.
Perkin-Elmer Limited
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