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[2] Zhencheng CHEN, Xianliang WU, Feijun ZHAO. EEMD combined with wavelet thresholding for noise reduction of optoelectronic volumetric pulse wave signals. Optical Precision Engineering, 27, 1327-1334(2019).

[3] Jie CHEN, Haoran LIU, Weijie WANG et al. High durable, biocompatible, and flexible piezoelectric pulse sensor using single‐crystalline III‐N thin film. Advanced Functional Materials, 29, 1903162(2019).

[4] Y MIYAUCHI, S KOYAMA, H ISHIZAWA et al. Basic experiment of blood-pressure measurement which uses FBG sensors(2013).

[5] Cheng ZHANG, Yihe WANG, Changyun MIAO. Analytical processing and feature extraction of fiber grating pulse wave. Signal Processing, 31, 1145-1151(2015).

[6] Yanan ZHANG, Di FAN, Lingyong SHEN et al. Experiments on strain transfer and accuracy of FBG fine diameter shape sensors. Optical Precision Engineering, 27, 1481-1491(2019).

[7] Yan WANG, Nan QIN, Jihong LIU. Performance testing of flexible temperature and pressure sensing based on optical fiber grating. Journal of Instrumentation, 40, 209-214(2019).

[8] Yongxing GUO, Yuehui YANG, Li XIONG et al. Bending measurement response characteristics of soft materials with different Young's modulus implanted in fiber Bragg gratings. Optical Precision Processes, 28, 1634-1643(2020).

[9] Baocun FAN, Yan WANG, Chengcheng HUANG et al. Pulse wave signal feature recognition based on time domain differential period ratio. Journal of Photonics, 49, 1206003(2020).

[10] Zhong JI, Xu LIU. Research on pulse wave feature point identification based on waveform features and wavelets. Journal of Instrumentation, 37, 379-386(2016).

[11] Yue ZHANG, Zhengcheng CHEN, Yongbo LIANG et al. An optical volumetric pulse wave-based method for atrial fibrillation identification. Chinese Journal of Medical Physics, 37, 1416-1420(2020).

[12] Y YAO, L XU, Y WANG et al. Diastolic augmentation index improves augmentation index in assessing arterial stiffness(2017).

[13] Ziyang GE, Yan WANG, Nan QIN et al. Strain error analysis of FBG flexible sensor interface slip under forward pressure. Journal of Photonics, 49, 1006001(2020).

[14] Y Y SUN, Y WANG, Yangyang SUN et al. Internal strain fiberoptic measurement of strain transfer in model similar materials. Geotechnics, 39, 759-764(2018).

[15] Haiyan WU, Zhong JI, Mengze LI. Research on non-invasive continuous blood pressure monitoring model cluster based on pulse wave. Journal of Instrumentation, 41, 224-234(2020).

[16] Wenyan LIU, Lisheng XU, Zhongpeng LI et al. Aortic pressure pulse wave reconstruction based on subspace method. Journal of Northeastern University (Natural Science Edition), 40, 1240-1244+1278(2019).

[17] Gongzhe CUI, Zhaoxia ZHANG, Lingzhen YANG et al. An improved wavelet threshold denoising algorithm. Modern Electronic Arts, 42, 50-53+58(2019).

[18] Yan FENG, Yuxiao DU, Fenghua HUANG. Design and implementation of wavelet transform-based EEG noise filtering algorithm. Journal of Guangdong University of Technology, 27, 72-75(2010).

[19] Zhan ZHAN, Huibin QIN. Wavelet thresholding denoising algorithm based on a new threshold function. Computer Technology and Development, 29, 47-51(2019).

[20] Wei JU, Changhua LU, Yujun ZANG et al. Improved threshold boosting wavelet and adaptive filter for open optical path infrared spectral denoising. Spectroscopy and Spectral Analysis, 38, 1684-1690(2018).