LITGS 2016-04-27 Go to Project Site LITGS signal obtained over a sooty ethylene flame using 1064 nm: frequency proportional to square root of temperature. Cheaper than CARS, seed free.. LITGS Simone Hochgreb Professor of Engineering My interests are in reacting flows, optical diagnostics, thermoacoustics, particle synthesis and aerosols. Related Quantitative measurement of temperature in oxygen enriched CH4/O2/N2 premixed flames using Laser Induced Thermal Grating Spectroscopy (LITGS) up to 1.0 MPa