Measurement of scattering laser energy density distribution in optical extinctive chambers based on CCD imaging method

The CCD imaging method is usually used in the far-field laser energy density distribution measurement, and the method is simple, reliable. The scattering laser energy density distribution in optical extinctive chambers is one of the most important factors affecting the performance of hardware-in-the-loop simulation system for laser guided weapon because of the weak signal, therefore, how to accurately measure the scattering laser energy density distribution is the key factor to the performance of the laser guided weapon evaluation. In this paper, the method of CCD imaging for scattering laser energy density distribution measurement in optical extinctive chambers was shown. Firstly, the principles and setup of measurement based on CCD imaging method were studied, and the model of scattering laser energy density measurement was simplified under special conditions. And then, the calibration process between the region division and the FOV (field of view) of CCD was described simply, the relationship between the gray value and laser energy density was found. Finally, the scattering laser energy density distribution in optical extinctive chambers was deduced by the measurement of the CCD’s gray value, and measurement errors were also analyzed.