Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrophotometer
Patent
1980-03-07
1982-06-01
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrophotometer
G01J 308, G01J 342
Patent
active
043324703
ABSTRACT:
A light chopper for chopping the monochromatic light beam of a spectrophotometer system, has a rotatable shaft driven by a synchronous motor at a frequency proportional to the power line frequency. An aperture bearing disc rotates with the shaft in relation to a photocell/detector array for generating digital timing signals for use by a microcomputer to control the tasks of the spectrophotometer system in synchronism with line frequency. The microcomputer monitors line frequency for responsively programming a programmable divider for generating an index signal for proportionally sequencing the wavelength of the monochromatic beam through a predetermined spectral range.
The rotatable shaft is coupled to the synchronous motor via a mechanical pin drive and a set of attracting magnets which are spaced in face confronting relation at the point of coupling for providing compliance and damping between the coupled shaft and synchronous motor, thus minimizing phase jitter of the timing system and permitting rejection of time frequency stray circuit pickup.
REFERENCES:
patent: 4030829 (1977-06-01), Hooper
patent: 4132481 (1979-01-01), Ford et al.
patent: 4176957 (1979-12-01), Maeda et al.
Chamran Morteza M.
Ford Michael A.
Scott Larkin B.
Williams Paul B.
Giarratana S. A.
Grimes E. T.
Hays R. A.
McGraw Vincent P.
The Perkin-Elmer Corporation
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