Photoacoustic Raman spectroscopy

Optics: measuring and testing – By dispersed light spectroscopy – With raman type light scattering

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G01J 344

Patent

active

042695090

ABSTRACT:
A method and apparatus for spectroscopic material analysis are provided. Two coherent beams of monochromatic radiation are directed through a sample of material. A tuning mechanism adjusts the frequency difference between the radiation beams to equal substantially the vibrational frequency of a preselected constituent of the material. Molecular energy of a preselected constituent of the material is increased, thereby producing a detectable signal in the form of a pressure wave. The signal is received by a detecting mechanism which indicates the magnitude thereof.

REFERENCES:
patent: 2212211 (1940-08-01), Pfund
patent: 3820901 (1974-06-01), Krevzer
patent: 3995960 (1976-12-01), Fletcher et al.
patent: 4084100 (1978-04-01), Begley et al.
patent: 4197009 (1980-04-01), Berry et al.

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