Generation or coherent rotational anti-stokes spectra

Details Generation or coherent rotational anti-stokes spectra Generation or coherent rotational anti-stokes spectra

G - Physics

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G01N 21/01 (2006.01) G01J 3/10 (2006.01) G01J 3/28 (2006.01) G01J 3/44 (2006.01) H01S 3/082 (2006.01) H01S 3/1055 (2006.01) H01S 3/108 (2006.01) H01S 3/30 (2006.01)

Patent

CA 1053026

INVENTION: GENERATION OF COHERENT ROTATIONAL ANTI-STOKES SPECTRA INVENTORS: RICHARD F. BEGLEY JOSEPH J. BARRETT ABSTRACT OF THE DISCLOSURE A method and apparatus for spectroscopic gas analysis are provided. Two coherent beams of monochromatic radiation are directed through gaseous material. A tuning mechanism adjusts the frequency difference between the radiation beams to equal subs- tantially the rotational frequency of a preselected constituent of the gaseous material. Radiation scattered by the gaseous material is received by a filtering mechanism adapted to transmit selectively an anti-Stokes signal generated coherently during scattering. The signal is received by a detecting mechanism which indicates the intensity thereof.

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