Qian WANG, Peng-fei LÜ, Qiao-zhi HE, et al. Characteristics comparison of photoacoustic signal of glucose solution in time domain and frequency domain[J]. Optics and precision engineering, 2020, 28(11): 2421-2428.
DOI:
Qian WANG, Peng-fei LÜ, Qiao-zhi HE, et al. Characteristics comparison of photoacoustic signal of glucose solution in time domain and frequency domain[J]. Optics and precision engineering, 2020, 28(11): 2421-2428. DOI: 10.37188/OPE.20202811.2421.
Characteristics comparison of photoacoustic signal of glucose solution in time domain and frequency domain
To overcome the shortcomings of the time-domain signal
which is easily affected by environmental interference
and improve the stability of photoacoustic measurements of the liquid concentrations
this study investigated the frequency-domain characteristics of a photoacoustic signal based on the time-domain peak-to-peak characteristics of the photoacoustic signal. The power spectrum characteristics and maximum entropy spectrum characteristics of the photoacoustic signal of glucose solution were evaluated. Different methods
such as peak detection and logarithmic fitting
were used to analyze the spectral characteristics of the photoacoustic signal. The nonlinear error and repeatability error of the time-domain peak detection
power spectrum
and maximum entropy spectrum methods were compared. The experimental results show that by using the intercept to characterize the photoacoustic signal after the logarithmic fitting of the maximum entropy spectrum curve
the nonlinear error and repeatability error can be reduced by 28% and 71%
respectively
compared with the traditional time-domain peak-to-peak detection method. The frequency-domain method can be used to reduce the nonlinear and repeatability errors of glucose concentration detection significantly. Furthermore
the frequency-domain method could improve the accuracy and stability of noninvasive blood glucose concentration detection.
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references
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