THE TRANSIENT REGIME OF A MULTIWAVELENGTH PYROMETER

The transient operation of a new multiwavelength pyrometer based on a dispersing prism and a Si photodiode array is presented. After calibra tion, transient tests were performed using a tungsten strip lamp, supp lied by a current pulse of 0.3-s duration. Measurements were carried o ut with a data acquisition system consisting of a FET multiplexer, a D VM (14 bit, 100 kHz), and a buffer memory (64 kbytes). Pyrometer signa ls are processed off-line, and temperature vs time is displayed. With the present arrangement, temperature measurements at 20 wavelengths ma y be performed with 200 mus resolution. Faster measurements are possib le with a reduced number of channels.