Photoacoustic Raman spectroscopy

Details Photoacoustic Raman spectroscopy Photoacoustic Raman spectroscopy

1978-05-26

1980-04-08

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With raman type light scattering

G01J 344

Patent

active

041970098

ABSTRACT:
A method and apparatus for spectroscopic material anaylsis are provided. Two coherent beams 15, 17 of monochromatic radiation are directed through a sample of material. A tuning mechanism 14 adjusts the frequency difference between the radiation beams 15, 17 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 22 in the form of a pressure wave. The signal is received by a detecting mechanism 24 which indicates the magnitude thereof.

REFERENCES:
patent: 3973134 (1976-08-01), Begley et al.
patent: 4044257 (1977-08-01), Kreuzer
patent: 4051372 (1977-09-01), Aine
patent: 4068125 (1978-01-01), Bell
patent: 4077719 (1978-03-01), Barrett

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