The hardware system for position measure of the micro-wall-climbing also had been discussed and designed in the thesis, including the structure, the working theory and parameters of two-dimensional PSD, the signal processing circuit of PSD, the LED circular lighting system, A/D conversion circuit board, the optical lens and PC and so on.
A newly developed method of inclination measurement and a kind of two-dimensional photoelectric tiltmeter are introduced in this paper. It works by a liquid pendulum, a laser beam and a two-dimensional PSD makes up of the reading system. It has high stability both in time and temperature.
The training system of simulation shooting suitable for the Chinese national shooting team is developed. A two-dimensional PSD (Position Sensitive Detector) receiving four infrared rays from the target is adopted to locate the position of the line of sight, thus two shooting targets used in the former systems are cut to a single target, which is very helpful for the micromation of the equipment.
The relationship between the output current and position of the modified tetra-lateral 2D PSD with orthogonal electrodes and the bordered 2D PSD with a low resistance square border on the sensitive surface are calculated, and the non-linearity distribution of two kinds PSD is also discussed. A 8mmx8mm pincushion 2D PSD is well designed for fabrication based on the Gear theorem.
It also introduces a method of calibrating the non linearity of the 2 D PSD rapidly. The system can realize the convey of the 4 analogy channel DMA with the acquisition card of 16 channels.
Based on the uniform configuration model for a distribution RC transmission-line approximation, the analytic solutions of photo potential distribution on 1D Position Sensitive Detector (PSD) and 2D PSD surfaces are discussed and corresponding simulations are also performed.
While 2D PSD photo potential gradually decreases from the incident position of light to four electrodes and impacts on each other in two vertical directions. For given parameters, the error between the detected position and true incident position is up to 60%.