Aeroballistics range photopyrometry

The development of photopyrometry systems employing state-of-the-art image intensifiers has extended the lower limit for inflight nosetip surface temperature measurements on track-guided models in the hyperballistic range (G) to 1,250 K. Two recently developed types of photopyrometers are used to span the 1,250 K to 4,000 K temperature measurement range during reentry materials evaluation testing. Measurement uncertainty associated solely with the photopyrometry systems is + or - 130 K or better for measurement of any temperature within this measurement range.