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.