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Coherent anti-Stokes Raman scattering (CARS)
(temperature measurement, mainly using the nitrogen present in air-fed combustion, also under technically
difficult boundary conditions)



CARS measurement for temperature determination in a ramjet combustor

Coherent anti-Stokes Raman scattering is a technique for measuring temperatures in combustion systems, with spatial and temporal resolution under technical conditions. The indicator molecules used are N2 for combustion with air and H2 in the special case of high-pressure H2/O2-combustion for rocket propulsion systems. A method developed by this workgroup (shifted vibrational CARS) permits exact temperature measurement in sooting flames; such measurements were hitherto exposed to strong interference of C2 emissions with the N2-CARS signal of a conventional CARS system, and were therefore inexact. With our mobile CARS system, temperature measurements (mean temperature values and temporal fluctuations) are performed on technical systems for customers.


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