A Study on Calibration Error Correction Method for Measurement of Infrared Radiation on Ships

Abstract

Radiation calibration is one of the important factors affecting the accuracy of IR characteristics measurement. Radiation calibration is mainly completed by measuring blackbody. However, a certain type of ship mounted theodolite has a large blackbody area, long heating time, and low temperature uniformity, which leads to significant system calibration errors. This article evaluates and corrects the calibration parameters K and B values of the system by installing a portable blackbody at the bow of the ship. The results were verified by measuring portable blackbody at different temperatures, regions, sea areas, and distances. The inversion temperature error decreased from an average of 18.5℃ to 6.1℃, indicating that a certain distance calibration method significantly improves the measurement accuracy of the wave IR characteristics of the shipborne theodolite.