Realtime sensitivity correction method and infrared imaging system

摘要

A realtime sensitivity correction method for use in an infrared imaging system, which compensates for possible sensitivity variations among a plurality of sensor elements constituting a infrared sensor device. The infrared imaging system comprises: an infrared sensor which accepts infrared rays emanating from a target object through an appropriate optical system, two reference heat sources, a sensitivity correction circuit composed of digital signal processors, RAM, and other components, a sensitivity correction sequence controller, and a video monitor. The system's scanning cycle consists of an effective scanning period and a non-effective scanning period. During a non-effective scanning period, the infrared sensor scans the high-temperature and normal-temperature reference heat sources. By averaging the detected values, high-temperature reference data and normal-temperature reference data are obtained. Sensitivity correction coefficients are then calculated from the high-temperature and normal-temperature reference data. In the subsequent effective scanning period, the infrared sensor scans the target object, and the resultant image data is corrected according to the sensitivity correction coefficients.