Continuous particulate-measuring apparatus using an optoacoustic

Details Continuous particulate-measuring apparatus using an optoacoustic Continuous particulate-measuring apparatus using an optoacoustic

1983-06-28

1986-06-10

Rosenberger, R. A.

Optics: measuring and testing

For light transmission or absorption

By comparison

73 24, G01N 2161

Patent

active

045940045

ABSTRACT:
An apparatus for continuously measuring the concentration of particulates in a sample gas by using an optoacoustic effect. Identical laser rays are directed along two optical paths, and a chopper and an optoacoustic cell are position in the recited order in each of the optical paths. Sample gas containing particulates is introduced into one optoacoustic cell and sample gas from which the particulates have been removed is introduced into the other optoacoustic cell. The respective choppers are driven for producing a chopping action on the respective laser rays at a frequency corresponding to the resonant frequency of the corresponding optoacoustic cells, and the outputs from the cells can be compared for providing an indication of the concentration of the particulates in the sample gas.

REFERENCES:
patent: 3948345 (1976-04-01), Rosencwaig
patent: 4277179 (1981-07-01), Bruce

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