Optics: measuring and testing – Inspection of flaws or impurities – Bore inspection
Patent
1975-04-10
1977-09-13
McGraw, Vincent P.
Optics: measuring and testing
Inspection of flaws or impurities
Bore inspection
250565, 356 88, 356 93, 356 94, 356 96, 356223, 356229, G01N 2122, G01J 342, G01J 142
Patent
active
040478190
ABSTRACT:
Apparatus for measuring the optical density of a sample includes a dual beam spectrophotometer producing sample and reference signals which are compared with the discharge curve of a resistive-capacitive circuit to provide start-stop signals, the time interval between the two signals being indicative of optical density. Embodied within this linearization means is a novel method of correcting for nonlinearities due to stray light. The start and stop signals are used to drive a linear ramp generator, the stop signal terminating the ramp at an analog signal level indicative of optical density.
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McGraw Vincent P.
Smith Kline Instruments, Inc.
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