基于FPGA高速信号采集的多角度动态光散射法纳米粒径测量

doi:10.3969/j.issn.1000-1158.2021.04.06

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Abstract According to the principle of measuring nano-particle size by dynamic light scattering device, an apparatus of nano-particle size measurement system based on field programmable gate array(FPGA)is developed.Scattering light signalsare transferring in to level signal through photomultiplier tubes(PMT),and an FPGA is developed to realize high-speed pulse collection and autocorrelation function calculation.Double pulse counting is used to achieve high-precision and controllable continuous signal counting.DDR3 is used to achieve asynchronous storage, and then connected with PC ends by using USB communication interaction functions.The home-designed FPGA card can both calculate autocorrelation function inside as well as achieve mass original data storage.200nm polystyrene particles is measured and the effects of different sampling time and delay time parameters on the particle size measurement results are analyzed.Experimental results show that the self-developed FPGA acquisition board measurement repeatability is 1.2%, can achieve accurate signal acquisition and has excellent stability and repeatability.

Key words： metrology nanometer particle size dynamic light scattering FPGA double pulse counter method auto-correlation function

Received: 07 January 2020 Published: 20 April 2021

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TB921

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	Articles by authors
	ZHANG Ze-rui
	HUANG Lu
	GAO Si-tian
	CAI Jin-hui
	SUN Miao
	CUI Zhen

Cite this article:

ZHANG Ze-rui,HUANG Lu,GAO Si-tian, et al. Nano-particle Size Measurement by Multi-angle Dynamic Light Scattering Based on FPGA High-speed Signal Acquisition[J]. Acta Metrologica Sinica, 2021, 42(4): 438-444.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2021.04.06 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2021/V42/I4/438

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