公开(公告)号：AU1272699A

公开(公告)日：1999-05-17

申请号：AU1272699

申请日：1998-10-21

Applicant: ENGELHARD SENSOR TECHNOLOGIES

Inventor： STEINTHAL GREGORY ,  KOUZNETSOV ANDRIAN

IPC: G01J3/10 ,  H01K1/02

Abstract: A power circuit for use with a resistive thermal radiation source in which the power delivered to the resistive thermal radiation source will remain constant within a preselected deviation over a fixed period of time as the source resistance of the source varies between an initial source resistance and a second source resistance at the operating temperature. The power circuit is designed to maintain constant power within a preselected deviation by using the resistance of the resistive thermal radiation source to calculate a preselected resistance used in the power circuit according to the following equation: wherein DELTA P=Psi-Ps; Psi=the initial power on the resistive thermal radiation source; Ps=the power on the resistive thermal radiation source when the source resistance is equal to the second source resistance; K1=RO/Rsi; R0=the preselected resistance; Rsi=the initial source resistance; K2=Rs/Rsi; and Rs=the second source resistance.