Abstract—In this paper we are interested in modeling, simulation, and measurement of laser beam spot position determination circuit (LSPDC) with a quadrant detector (QD). The photodiode is modeled using its differential equations then implemented using ORCAD –Pspise. Starting with the output of the detector, the circuit modeling and simulation for the preamplifier, post amplifier, ADC and microcontroller card were performed. PCB card implementation was performed and integrated with the QD and the necessary optical system components. The implementation of the full LSPDC with the detector is performed. General system for testing the spot LSPDC was performed with a laser source simulating the incident radiation and a mechanical system to enable adjusting different angles. Good agreement has been achieved between the measured data and the adjusted angles with a small error attributed to the error in the adjusted
Index Terms—Photodiode modeling, quad detector, spot position measurements.
Mohamed Fathy Heweage and Xiao Wen is with the School of Instrumentation Science and Optoelectronic Engineering, Beihang University, 37Xueyuan Road, Beijing 100191, China (e-mail: mohamed_heweage@buaa.edu.cn, xiaow@buaa.edu.cn).
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Cite: Mohamed Fathy Heweage, Xiao Wen, and Ahmed Eldamarawy, "Developing Laser Spot Position Determination Circuit Modeling and Measurements with a Quad Detector," International Journal of Modeling and Optimization vol. 6, no. 6, pp. 310-316, 2016.
