Abstract: In order to realize fast and high-precision calibration of detector array, the control system of
high-precision two-dimensional calibration platform for detector array is studied, and a closed-loop
displacement control system using a single chip computer to control stepping motor and encoder is
designed in this work. Firstly, the calibration principle of the platform and the design of hardware and
software control system are introduced, then the control PID algorithm is studied. Finally, a calibration
system is built to test the designed control system comprehensively. The experimental results show that
the control system has good control ability. The positioning accuracy of the platform can reach
−11~12 μm within the effective itinerary of 600 mm × 600 mm. The variation coefficient of ten single
 point test data is 0.13%, and the average measurement error in continuous mode is 1.65%, indicating that
the designed platform meets the calibration requirements of detector array and provides an effective
means for the calibration of detector array.

Key words: control engineering, detector array calibration, two-dimensional platform, closed-loop control system, stepping motor, PID algorithm