Effective range of electron temperature measured by infrared Nd:glass laser scattering apparatus

This article briefly describes the principle of Thomson scattering to measure the electron temperature, and gives the way of calculating electron temperature, which adapted to the Nd:glass laser scattering apparatus. Then based on the principle of probability it analyzes the effect range of electron temperature that was measured by infrared laser scattering apparatus on HT7 superconducting tokamak, and the effective range of electron temperature is １００eV～5keV．