Coherent anti-stokes Raman scattering CARS thermometry

In exemplarily flame measurements conducted at the LTT-Erlangen (Will et al., 1996), flame temperatures were determined by emission spectroscopy or coherent anti-Stokes Raman scattering (CARS) thermometry depending on the maximum soot concentration. Typical temperatures are in the range of 1800 K in the middle of the flames and up to 2100 K in the outer regions where the reactions take place. A typical measurement setup for two-dimensional LII investigations is shown in Figure 10. 

Herzberg et al. showed with the help of Coherent anti-Stokes Raman scattering (CARS) thermometry that heating at a rate of 1700 K/s causes a delay between the temperature of the gaseous phase and the tube wall of at several hundred milliseconds (Figure 6.23) [90]. However, in the first 200 to 300 ms of the atomization phase, the delay is minimal, and just beyond 300 ms a usually proportional delay is determined. 

Coherent Anti-Stokes Raman Scattering (CARS) Thermometry is a technique for temperature measurement in high temperature environments using a third-order nonlinear optical process involving a pump and a Stokes frequency laser beam that interacts with the sample and generates a coherent anti-Stokes frequency beam. 

---

See also in sourсe #XX -- [ , ]

---