Modulated detector

Details Modulated detector Modulated detector

1980-07-14

1982-02-23

Kreitman, Stephen A.

Measuring and testing

Gas analysis

By vibration

422 54, G01N 2718, G01N 2716

Patent

active

043163815

ABSTRACT:
The continuous flow of sample fluid, e.g., the elution from the column of a chromatograph, is modulated with the aid of a storage volume such that the flow of sample fluid into the fluid input of a detector varies between maximum and minimum values at a given frequency, the flow of reference fluid to the fluid input of the detector is modulated out of phase, and the differences in output of the detector resulting from these modulated flows is derived by a synchronous detector or demodulator.

REFERENCES:
patent: 2255551 (1941-09-01), Willenborg
patent: 3790348 (1974-02-01), Bossart et al.
patent: 4185490 (1980-01-01), Clouser et al.
patent: 4254654 (1981-03-01), Clouser et al.

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