Pyrometer with digitalized linearizing correction having programmable read only memory

Claim 1

Digitalized linearizing correction circuitry for use in a pyrometer having dual slop integration means which includes input means for receiving separately the analog signal of variable temperature measurements and a fixed reference signal, integrating means coupled to said input means, and an output at which appear sequentially a first and second ramp signals of opposite polarity, representing the reference and temperature input signals, respectively; clock pulse generating means for supplying a train of clock pulses; and pulse counting means having an input and a plurality of discrete numeric outputs; said linearizing Circuitry being connected to receive said train of clock pulses and said numeric outputs and having an output coupled to said input of said pulse counting means, said linearizing circuitry including logic gating means interconnected for response to said discrete outputs for generating a plurality of periodically repeating clock pulse suppression signals for inhibiting the passage of numerically selected ones of said clock pulses to said pulse counting means; said logic gating means including an input gating portion having logic elements and an output, a read only memory (R.O.M.), and an output suppression portion; said R.O.M. and the logic elements of said input gating portion both being connected to receive said numeric outputs from said pulse counting means, the R.O.M. employing said numeric outputs as input address lines for defining a plurality of different suppression responses for association with temperature range segments of the pyrometer, and said R.O.M. having output lines for connecting said different suppression responses to the logic elements of said input gating portion, whereby said input gating portion generates and couples to said output suppression portion discrete and selective output command signals for the generation of said suppression signals.