10‐Hz coherent anti‐Stokes Raman spectroscopy apparatus for turbulent combustion studies

A 10‐Hz coherent anti‐Stokes Raman spectroscopy (CARS) instrument capable of simultaneous thermometry and N2‐concentration measurements in a turbulent flame has been designed and constructed and is described in detail. The instrument employs the doubled output of a pulsed Nd:YAG laser for pumping a broadband dye laser and also for the CARS pump beam. The broadband dye laser is used to excite, during a single pulse, the entire Q Branch of N2, the CARS signal of which is recorded by a multichannel analyzer. Special problems which were encounted with the multichannel analyzer include signal retention and limited dynamic range. The former was greatly reduced by employing cleansing scans between laser firings, and the latter was circumvented by employing a multiple beamsplitter arrangement in which the CARS signal was divided into four separate intensity regions, each of which covered a specific temperature range. The 10‐Hz operation of the instrument required the use of a mass storage device such as an 800‐bi...

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