Laser diode (LD) and avalanche photodiode (APD) are crucial components for laser range finding. Their performances are influenced by temperature

which limits the measuring resolution of laser range finder. So the temperature control system is necessary. As LD and APD are low power components

Self-heating effect of Pt resistance influences the resolution of temperature control system. The main error sources using Platinum resistor in temperature measuring were analyzed in detail

a new set of circuit based on pulse current drive was proposed. The models of pulse current drive circuits and its equivalent heat loop of self-heating are set up. The relationship of pulse width and heat quantity accumulation is given. The experiments showed that the measuring error from the self-heating effect decreased sharply by controlling the pulse width properly. The Platinum resistor nonlinear is compensated which employed the high-order orthogonal polynomial method. The high precision of compensation is proved by comparison tests of the temperature measuring module and the absolute standard Platinum resistance thermometer. The maximum error absolute value is less than 0.0006o at different temperature in 0o~15o . The stability of temperature is better than ±0.005o in the controlled temperature range and meets the need of accuracy in range finder system.