High energy laser target screen made of thermoelectric cooling chips

To measure far field intensity distribution of high energy laser by thermal image method, we studied a laser screen made of thermoelectric cooling chips(TECC). We first built heating model of target surface by laser irradiation based on heat conduction equation, then found out the relationship between the temperature of target surface and the laser intensity. We proved the feasibility of using the TECC made of alumina ceramic as target screen and studied the improvement of measurement with cooling function. We developed a 200 mm×200 mm screen with cooling power of 4 800 W, which was combination of 16 chips with size of 50 mm×50 mm and cooling power of 300 W. And there are 8 objects for infrared image calibration around the screen.