Research on non-uniformity correction based on blackbody calibration

Abstract

The non-uniformity of digital response of the infrared temperature measurement system which based on infrared focal plane array (IRFPA) seriously affects the temperature accuracy and image quality. In this paper, three non-uniformity correction (NUC) methods are performed to eliminate the non-uniformity, namely, the one-point correction (OPC), two-point correction (TPC) and multi-point correction (MPC) algorithms. A high precision blackbody radiation source is used for calibration experiments. This paper also verifies that the difference in calibrated ambient temperature will affect the correction effect and the correction temperature. The NUC results are evaluated by two aspects of subjective and objective evaluation. The experimental results show that the TPC correction effect is similar to MPC and is superior to OPC method. The non-uniformity degree can be reduced 12.35% compared to the original non-uniformity.