Study Of High Precision Displacement Sensor Based On Position Sensitive Detector(PSD)

In view of the practical use of Laser Displacement Transducer in industrial production, non-contact real-time measurement and accurate positioning, In this thesis, high Precision Displacement Sensor Based on Position Sensitive Detector(PSD) is researched。The operating principle of PSD was introduced briefly. Configuration parameters of laser triangulation sensor were analyzed. The PSD detection circuit with a variety of magnifications was designed to achieve the ability of self-adapting. The principle of transforming current to voltage is analyzed, and it is pointed out that the error factors mainly consist in the bias curent and offset voltage of the operational amplifier. Finally, the various factors of influencing sensor measurement accuracy and elimination methods were analyzed and discussed.