Data compression system for a photometer

Details Data compression system for a photometer Data compression system for a photometer

1981-08-27

1985-02-12

Rosenberger, R. A.

Optics: measuring and testing

For light transmission or absorption

By comparison

356123, 250205, G01N 2122

Patent

active

044987811

ABSTRACT:
A data compression system includes a logarithmic ratioing network configured from only two chopper stabilized operational amplifiers connected to a dual slope analog-to-digital converter having a signal integrate time t.sub.int. The system is characterized in that the chopping frequency of the chopper stabilized operational amplifiers is equal to the inverse of an integer number N times the signal integrate time of the converter. For the analog-to-digital converter to average to zero the noise output due to chopping, the chopper stabilized operational amplifiers are driven together at the chopping frequency.

REFERENCES:
patent: 3173983 (1965-03-01), Engle
patent: 3970393 (1976-07-01), Krygeris et al.
patent: 4080075 (1978-03-01), Berg
Analog Devices, Inc., "Analog-Digital Conversion Handbook", D. H. Sheingold, Editor, Jun. 1972, pp. II-48 to II-52.

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