An Instantaneous Optical Pyrometer with Six Channels for the Shock Temperature Measurement in Materials

An instantaneous optical pyrometer to measure the spectral radiance of the materials shoched to high pressures has been developed. Thermal radiation emitted by the source is sampled at six wavelength bands from visible to near infrared spectrum, and the signal for each channel is separately transited though the optical fiber and then detected by photomultipliers and oscilloscopes with a time resolution of 20 ns. Shock temperatures ranging from 2 400 K to 9 000 K could been reliably measured with an error less than 3%. The results of some experiments on air and NaI crystals are also given.