Photometer Calibration: The Case for Two-Point Calibration and Multi-Point Verification

This technical note discusses the rationale for using two-point calibration and multi-point verification in the calibration of aerosol photometers. It explains the theoretical basis for the linear relationship between photometric response and aerosol mass concentration, highlights practical challenges with multi-point calibration, and advocates for two-point calibration to minimize errors. The combination of two-point calibration and multi-point verification ensures the accuracy and performance of the photometer in critical applications.