An improved calibration method for a nondestructive testing system based on infrared thermopile sensors

摘要

This paper presents an improved calibration method for a nondestructive testing system based on infrared thermopile sensors. The method uses reference source radiation to get the calibration parameters. A new two-point with multi-step calibration algorithm serving as the calibration of infrared thermopile sensors was proposed after researching the two-point calibration algorithm used for the calibration of infrared detector array pixels. The experiment verified that this method has advantages of simple operation, is easy to implement and has good calibration effect when compared with the commonly used two-point calibration algorithms.