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There are usually non-equilibrium transmission characteristic among the measurement channels of a photoelectric testing system with intersecting detection areas, and it will lead to a poorer measurement result provided that they are not properly calibrated and equalized. To improve the measurement accuracy of the system, this article presents an original calibration &#x0026; equalization method to effectively restrain the effect of the non-equilibrium transmission characteristics. The measurement principle of this system is described in detail. Then, main transmission characteristic of the measurement channel is analyzed, and a calibration model is established and the requirements of its calibration signal are considered. Next, the equalization principle of measurement channel is studied, and then a compensating network is developed to perform an iterated algorithm to equalize the measurement channels. Through semi-physical simulation, the results show that an experiment platform is developed to generate several parallel calibrated signals with quasi&#x2013;delta, and this can obtain the key characteristic (i.e., delay time) of the measurement channels. Furthermore, the transmission delay difference between any two measurement channels is below <inline-formula> <tex-math notation="LaTeX">$0.5~\mu \text{s}$ </tex-math></inline-formula> through iterated equalization. Consequently, the proposed calibration and equalization method can effectively decrease the systematic error of the testing system.

Calibration and Equalization for the Measurement Channels of a Photoelectric Testing System With Intersecting Detection Areas