Synchronous wavelength drive and data acquisition conversion for

Details Synchronous wavelength drive and data acquisition conversion for Synchronous wavelength drive and data acquisition conversion for

1985-02-22

1987-04-28

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrophotometer

364498, G01J 342

Patent

active

046609776

ABSTRACT:
A sequential spectrophotometer system having a light source, a scanning type monochromator, a stepper motor means for changing the monochromator wavelength over a light spectrum being scanned, a photomultiplier for measuring the intensity of light absorption or passage through a sample being tested and generating a signal corresponding thereto, data acquisition means for compiling data corresponding to said signals and means for recording such data generally as a function of light measured for each wavelength, the improvement comprising:
a method and means to effect the data acquisition conversion at or about each desired wavelength during a respective stepper motor rotor displacement period, i.e., during each corresponding period of diffraction grating vibration or oscillation following a stepper motor disposition thereof to another wavelength position angle.

REFERENCES:
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patent: 3985442 (1976-10-01), Smith et al.
patent: 4000946 (1977-01-01), Way et al.
patent: 4037960 (1977-07-01), Macemon
patent: 4293222 (1981-10-01), Caruso et al.
patent: 4305664 (1981-12-01), Akitomo
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patent: 4332470 (1982-06-01), Chamran et al.
patent: 4412744 (1983-11-01), Lee et al.
Longerich et al, Analytical Chemistry, vol. 46, No. 13, Nov. 1974, pp. 2067-2071.
Coolen et al, Analytical Chemistry, vol. 47, No. 9, Aug. 1975, pp. 1649-1655.
Aaronson et al, American Laboratory, vol. 7, No. 9, Sep. 1975, pp. 57-63.

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