The traditional laser temperature measurement usually adopt the direct detection method, while the direct detection
method is easily influenced by aerosol scattering and background stray light. In this paper, the DSC710 balanced detector
was first applied to the measurement of complete gas Rayleigh - Brillouin scattering spectrum (RBS). By utilizing the
difference of RBS spectrum broadening under different temperature to get the temperature information. In this article, a
simple theoretical derivation and error analysis has been made. The results show that using this method can effectively
inhibit the interference of background stray light and has high precision.
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