Raman spectrometer

Details Raman spectrometer Raman spectrometer

1994-09-26

1998-07-28

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

With raman type light scattering

359885, 372 32, G01N 2165, G02B 522

Patent

active

057868930

ABSTRACT:
An improved Raman spectrometer is provided, having, in a preferred embodiment, a light source comprising an injection-locked laser diode array, a multipass cell to multiply the intensity of the light source, a dynamic gas sample focusing system, and an atomic vapor filter to remove the Rayleigh scattered light. The laser diode arrays are tuned to match an absorption band of the atomic vapor filter. The Raman scattered light passes virtually unattenuated through the filter to be recorded by a Fourier transform spectrometer or other spectrometer. This invention permits higher sensitivity and resolution than prior art Raman spectrometers, in particular permitting identification and measurement of Raman emissions that occur at low wave numbers. The light source of this invention can also be used in conjunction with optical notch filters and photodetectors to permit detection and measurement of preselected species in a sample.

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