Patent ID: 7570349
Filing Date: 2009-08-04
Classification: G01J,G01N

Abstract:
1. A method of sensing a target gas, comprising: generating two light beams at a first frequency and a second frequency from a single source at a first location, wherein the difference between the first and second frequencies is the Raman frequency of the target gas; generating, from the two light beams, a first light beam having the first frequency, a second light beam having the second frequency, and a third light beam having a third frequency that is the difference between the first and second frequencies; directing the first, second, and third light beams toward the target gas; directing light from the third light beam, after interacting with the target gas, to a receiver for absorption spectroscopy processing; and directing a fourth light beam from the target gas to a receiver for coherent anti-Stokes Raman processing, wherein the fourth light beam has a frequency of twice the first frequency minus the second frequency.