Absolute and Differential Temperature Monitors Developed for Apollo Space Experiments

Investigation of the key parameters of temperature sensors suggests either platinum wire resistance sensors or thermistors. Thermistors have higher sensitivity and generally adequate stability, but have been scorned due to their nonlinear characteristics. A simple monitor is developed to linearize these nonlinear characteristics. A FORTRAN IV computer program is shown which optimizes all circuit values. The general technique should be applicable to other instrumentation problems.