Laser spectral thermometry

with the advantages of non-contact operation

high resolution

and high sensitivity

shows great potential in high-precision temperature measurement in harsh and inaccessible environments such as high temperature

high-pressure

and combustion fields

and is widely applied in aviation

aerospace

and energy sectors.This paper focuses on two core techniques in laser spectral thermometry:coherent anti-Stokes Raman scattering(CARS)and laser-induced fluorescence(LIF)techniques.It systematically reviews their basic principles

technical characteristics

latest research progress

and application challenges

and prospects future development trends

aiming to promote the in-depth development and application expansion of this technology.