an improved infrared sensor is provided which is of the type which scans across a spatial region and detects infrared energy radiating from a celestial body and in which an input electronic signal is produced in response to the detected infrared energy , wherein the improvement comprises : amplifier circuit means for providing an amplified output signal in response to the input electronic signal ; threshold detection circuit means for detecting when the output electronic signal reaches a prescribed threshold level substantially below a saturation level of said amplifier circuit means said threshold detection circuit means comprising a thresholding circuit for providing a turn - on signal when the output signal reaches the prescribed threshold level ; and feedback circuit means for providing a feedback signal for limiting the input electronic signal provided to said amplifier circuit means , said feedback circuit means comprising a feedback amplifier circuit responsive to the turn - on signal , such that the feedback signal is provided when the output signal substantially reaches the prescribed threshold level ; wherein a feedback loop comprising said threshold detection circuit means and said feedback circuit means is characterized by a feedback ratio selected to substantially dampen unwanted oscillations in said feedback loop .