The energy measurement of high energy laser is converts incident laser energy into heat energy, calculates energy
utilizing absorber temperature rise, thus the energy value can be gained. Temperature measurement of high-energy laser
energy meter and energy loss compensation during the course of the measurement were studied here. Firstly,
temperature-resistance characteristics of resistance wire was analyzed, which was winded on exterior surface of the
absorbing cavity of high-energy laser energy meter and used in temperature measurement. Least square method was used
to process experiment data and a compensation model was established to calibrate the relationship of temperature vs.
resistance. Experiment proved that, error between resistance wire and Pt100 is less than 0.01Ω and temperature error is
less than 0.02°C. This greatly improves accuracy of the high energy meter measurement result. Secondly, aimed to the
compensation of laser energy loss caused by absorbing cavity's heat exchange, the heat energy loss of absorbing cavity,
resulted from thermal radiation, heat convection and heat conduction was analyzed based on heat transfer theory. Its
mathematics model was established. Least square method was used to fit a curve of experiment data in order to
compensate energy loss. Repetitiveness of measurement is 0.7%, which is highly improved.