Optics and Precision Engineering, Volume. 28, Issue 4, 808(2020)
Inhibition effect of angle weighting in signal noise in dynamic light scattering
In dynamic light scattering technology, the influence of autocorrelation data noise on measurement results primarily depends on the particle-size inversion algorithm. In multiangle measurement, angular weighting becomes another important factor restricting the influence of noise on the measurement results.Based on the analysis of angle weighting mechanism of multiangle dynamic light scattering, the inhibition effect of the angle weighting method of light intensity average and the iterative recursive method on the measurement of noise is studied. The results demonstrate that, in the absence of noise, for the small particles of the unimodal distribution, the PSD is slightly broadened when weighted by the iterative recursive method, and for the medium and large particles, the peak value error increases slightly when the light intensity average method is adopted. With an increase in noise, the performance index of iterative recursive inversion exhibits no obvious change, while the peak value error and PSD error of the results obtained via the light intensity average method are significantly increased. The inversion peak errors of 306/974 nm standard bimodal particle system were observed to be 0.170/0.121 and 0.092/0.097, respectively. The peak positions obtained via the iterative recursive method were more accurate, and the experimental results verified the conclusions from the simulation data. The iterative recursive method recalculates the angle weight via successive inversion and comparison of the PSD of each scattering angle. The "correction" effect of angle weight updation can largely offset the PSD error caused by noise, and thus, the "de-noising" performance of resisting the impact of noise has been depicted. Therefore, in a noisy environment, the iterative recursive method should be used for multiangle weighting.
Get Citation
Copy Citation Text
WANG Ya-jing, HUANG Yu, SHEN Jin, XU Ya-nan, ZHANG Wen-wen, MAO Shuai. Inhibition effect of angle weighting in signal noise in dynamic light scattering[J]. Optics and Precision Engineering, 2020, 28(4): 808
Category:
Received: Nov. 18, 2019
Accepted: --
Published Online: Jul. 2, 2020
The Author Email: Ya-jing WANG (wangyajing0725@126.com)