Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1990-12-28
1992-05-19
Turner, Samuel A.
Optics: measuring and testing
By particle light scattering
With photocell detection
356319, G01B 902
Patent
active
051142325
ABSTRACT:
There is disclosed an interference spectrophotometer which collects data while monitoring the position of a movable mirror by providing quadrature control to accurately perform coherent addition of data. The spectrophotometer includes a main interferometer, a control interferometer, a sliding controller controlling movement of the movable mirror, an A/D converter converting analog data obtained by the main interferometer into digital form, a register for holding data obtained by one scan of the movable mirror, a memory for accumulating data obtained by numerous scans of the movable mirror, an up/down counter receiving the output signals from two detectors included in the control interferometer, and a decision part. When the counter's value varies, the counter causes the A/D converter to perform its A/D conversion. Then, the decision part checks the counter's value after the A/D conversion. If this value differs from the count value obtained prior to the A/D conversion, the data held in the register is discarded.
REFERENCES:
patent: 4511986 (1985-04-01), Bellar
patent: 4799001 (1989-01-01), Burch
patent: 4847878 (1989-07-01), Badeau
Tsuji Fumio
Yoshikawa Osamu
Kurtz, II Richard E.
Shimadzu Corporation
Turner Samuel A.
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