基于FPGA与NAND FLASH的多通道动态光散射自相关器OA

To improve the data reliability and measurement accuracy of multi-angle dynamic light scattering(MDLS),a multi-channel DLS autocorrelator based on field-programmable gate array(FPGA)and non-volatile memory(NAND FLASH)is developed.The proposed multi-channel DLS autocorrelator utilizes the FPGA to achieve a multi-channel parallel synchronous acquisition mechanism and autocorrelation calculation.A dual-level collaborative storage architecture and a four-stage data transmission architecture consisting of"acquisition-caching-storage-readback"are constructed using RAM data caching units and a NAND FLASH storage module.Experimental results obtained with four types of monodisperse and bimodal polystyrene standard particle suspensions show that the measured particle size distribution for monodisperse particles approaches the true distribution,and the inversion results for bimodal particle systems are in good agreement with the true distributions.These findings demonstrate that the developed multi-channel DLS autocorrelator can effectively enhance the reliability and accuracy of MDLS measurements,providing reliable hardware support for particle size analysis of complex particle systems.