Spectrophotometers

Details Spectrophotometers Spectrophotometers

1984-09-14

1986-10-07

Roskoski, Bernard

Communications: electrical

Audible indication

Percussion-type sound producer

356319, 356325, H03M 100, G01J 306

Patent

active

046162100

ABSTRACT:
In a spectrophotometer having an optical beam chopped into dark and light segments, a computer controlled system is described for determining background signal due to stray light, photomultiplier dark current, offsets of photometric amplifiers and other components, and the like and for subtracting this background signal from the overall signal so as to leave only the desired light measurement. The same computer system also sets the signal level automatically for highest resolution. Furthermore, the same computer acts as an analog to digital converter by successive approximation to supply the photometric signal to the microprocessor unit. Since the same components are involved in all these functions both analog and digital offsets of the components are automatically cancelled.

REFERENCES:
patent: 4158505 (1979-06-01), Mathisen et al.
patent: 4180327 (1979-12-01), Maeda et al.
patent: 4238830 (1980-12-01), Unvala
patent: 4279510 (1981-07-01), Brown
patent: 4310243 (1982-01-01), Brown et al.

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