Research of Intelligent Clothing for Body Temperature Monitoring Based on Distributed Optical Fiber Bragg Grating Sensors

Hongqiang, 李鸿强 Li; Xiaogang, 于晓刚 Yu; Changyun, 苗长云 Miao; Enbang, 李恩邦 Li; Jiangtao, 习江涛 Xi; Rui, 王瑞 Wang; Cheng, 张诚 Zhang; Meiling, 张美玲 Zhang; Liyan, 刘丽妍 Liu

doi:10.3788/aos20092901.0208

Cited by 2 publications

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“…In terms of temperature and strain characteristics, fiber Bragg grating can be made temperature, cardio-movement and blood pressure sensors by different encapsulations [4] . These fiber grating sensors can measure multi-physiological parameters at the same time.…”

Section: Introductionmentioning

confidence: 99%

Research on fiber Bragg grating heart sound sensing and wavelength demodulation method

et al. 2010

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Heart sound includes a lot of physiological and pathological information of heart and blood vessel. Heart sound detecting is an important method to gain the heart status, and has important significance to early diagnoses of cardiopathy. In order to improve sensitivity and reduce noise, a heart sound measurement method based on fiber Bragg grating was researched. By the vibration principle of plane round diaphragm, a heart sound sensor structure of fiber Bragg grating was designed and a heart sound sensing mathematical model was established. A formula of heart sound sensitivity was deduced and the theoretical sensitivity of the designed sensor is 957.11pm/KPa. Based on matched grating method, the experiment system was built, by which the excursion of reflected wavelength of the sensing grating was detected and the information of heart sound was obtained. Experiments show that the designed sensor can detect the heart sound and the reflected wavelength variety range is about 70pm. When the sampling frequency is 1 KHz, the extracted heart sound waveform by using the db4 wavelet has the same characteristics with a standard heart sound sensor.

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Section: Introductionmentioning

confidence: 99%

Research on fiber Bragg grating heart sound sensing and wavelength demodulation method

et al. 2010

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Guided-Mode-Leaky-Mode-Guided-Mode Fiber Interferometer and Its High Sensitivity Refractive Index Sensing Technology

Wang

Zhao

et al. 2016

Sensors

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A cascaded symmetrical dual-taper Mach-Zehnder interferometer structure based on guided-mode and leaky-mode interference is proposed in this paper. Firstly, the interference spectrum characteristics of interferometer has been analyzed by the Finite Difference-Beam Propagation Method (FD-BPM). When the diameter of taper waist is 20 μm–30 μm, dual-taper length is 1 mm and taper distance is 4 cm–6 cm, the spectral contrast is higher, which is suitable for sensing. Secondly, experimental research on refractive index sensitivity is carried out. A refractive index sensitivity of 62.78 nm/RIU (refractive index unit) can achieved in the RI range of 1.3333–1.3792 (0%~25% NaCl solution), when the sensor structure parameters meet the following conditions: diameter of taper waist is 24 μm, dual-taper length is 837 μm and taper distance is 5.5 cm. The spectrum contrast is 0.8 and measurement resolution is 1.6 × 10−5 RIU. The simulation analysis is highly consistent with experimental results. Research shows that the sensor has promising application in low RI fields where high-precision measurement is required due to its high sensitivity and stability.

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Research of Intelligent Clothing for Body Temperature Monitoring Based on Distributed Optical Fiber Bragg Grating Sensors

Cited by 2 publications

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Research on fiber Bragg grating heart sound sensing and wavelength demodulation method

Research on fiber Bragg grating heart sound sensing and wavelength demodulation method

Guided-Mode-Leaky-Mode-Guided-Mode Fiber Interferometer and Its High Sensitivity Refractive Index Sensing Technology

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