Application Cases

Experiment Title: Overall Design of FPGA-Based SPGD Adaptive Optics Control Platform

Testing Purpose:Based on the analysis of the optimized adaptive optics system platform, and in combination with the principles of the SPGD (Stochastic Parallel Gradient Descent) algorithm and the actual project requirements, a scheme design for the SPGD adaptive optics control platform has been carried out. The modular composition and functional block diagram of the entire system have been determined, and a feasibility analysis of the designed scheme has been conducted.

Testing Equipment:High Voltage Amplifier, Functional Sensor, SPGD Controller, Wavefront Corrector, etc.

Experiment Process:

Figure 1: Adaptive Optics System Experimental Platform

Figure 1 illustrates the setup of the adaptive optics experimental platform based on this design. As visible from the figure, as the core of the adaptive optics system and the bridge connecting the system performance evaluation function sensor and the high voltage amplifier, the SPGD controller should include the following functional modules: performance metric acquisition module, SPGD algorithm module, and digital-to-analog conversion module.

Data acquisition serves as the data hub between the SPGD controller and the system performance evaluation function sensor. Depending on the type of system performance evaluation function sensor, the performance metric acquisition module varies. This design is based on two types of system performance evaluation function sensors: photomultiplier tube and CCD camera. Therefore, the performance metric acquisition module is correspondingly divided into two parts: analog signal acquisition module and image information acquisition module. For the analog signal acquisition module, since the analog signal output by the photomultiplier tube has a low voltage and contains noise, this module essentially performs filtering, amplification, and analog-to-digital conversion of the analog signal. The SPGD algorithm module primarily implements the SPGD algorithm and controls the interfaces of various modules. The digital-to-analog conversion module serves as the interface between the SPGD controller and the high voltage amplifier, converting the digital correction voltage values calculated by the SPGD algorithm module into analog voltage and delivering them to the high voltage amplifier. Additionally, to enhance the robustness of the control platform, several auxiliary modules have been added, including: fiber optic module, USB module, 100-Mbps Ethernet port module, serial communication module, and user IO module.

Experimental Results:

Based on the analysis of the optimized adaptive optics system platform, and in combination with the principles of the SPGD algorithm and the actual project requirements, a scheme design for the SPGD adaptive optics control platform has been carried out. The functional module composition of the entire system has been determined, and the design ideas and methods for each module have been provided.

High Voltage Amplifier Recommendation: ATA-7030

Figure: Specifications of the ATA-7030 High Voltage Amplifier

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