绝对辐射计是对辐射功率进行绝对测量的仪器。它利用热电堆测量辐射转换为热以后引起接收器温度升高而产生的热电势,通过电功率替代法用直流电功率校准辐射功率。绝对辐射计最先用于均匀辐照场的绝对测量,现已用来测量激光小功率。绝对辐射计接收器内发生的实际热过程是: 当某功率W输入后,一部分功率W_1,使辐射计接收器的温度升高△T,若接收器的热容为ρ,则 An absolute radiometer is an instrument that makes absolute measurements of radiant power. It uses the thermopile to measure the thermoelectric power generated when the radiation is converted to heat and causes the receiver temperature to rise, and the radiated power is calibrated by the electric power instead of the law. The absolute radiometer was first used in the absolute measurement of uniform radiation field, is now used to measure the laser power. The actual thermal process occurring in an absolute radiometer receiver is that when a certain power W is input, part of the power W_1 causes the temperature of the radiometer receiver to increase by ΔT. If the heat capacity of the receiver is ρ, then