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Optical fiber sensor with optical power feed

具有光馈电功能的光纤传感器

基本信息

批准号：
08044255
负责人：
TOGAWA Tatsuo
金额：
$ 2.82万
依托单位：
Institute for Medical and Dental Engineering, Tokyo Medical and Dental University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

Optical fiber sensor is promising to use in biomedical application. Has many advantages, i.e., it is small, free from electro-magnetic interference, safe for electric hazard and cheep. The aim of this study was to develop and evaluate optical fiber sensor and actuators.1) Heart and respiratory rates minitor by photo plethysmographyA simultaneous monitoring system for heart and respiratory rates has been developed by combined photo-plethysmography (PPG) and signal acquisition of wavelet transform. PPG signal which includes both heart and respiratory synchronous components was measured at a finger with a fiber-optic reflectance-mode PPG set-up. Different level of wavelet function was achieved to distinguish heart and respiratory signals from the PPG signal. The accuracy of the new instrument is comparable with existing methods for heart and respiratory rate monitoring.2) Tissue motion artifact in laser Doppler blood flow signalThe tissue matrix is continuously in motion under the influen … More ce of forces generated by the circulatory and respiratory systems. The hypothesis raised in this paper is whether the motion of tissue matrix grenerates an error signal in laser Doppler recordings that is misinterpreted as solely a blood flow signal. Measurements of skin motion in the forearm have been performed at 3 sites and the corresponding spectra have been compared with blood flow spectra recorded with the laser Doppler method. The two types of spectra overlap each other indicating that motion induced signals can be interpreted as a blood flow signal. The blood flow contribution from tissue motion varies strongly with the particular site under study.3) Reflection spectroscopy for the assessment of UV induced erythemaReflection spectroscopy was applied to broad spectrum light was transmitted to the tissue under syudy via optical fiber. A part of scattered light was received another set of potical fibers. The diffuse reflection spectrum was calculated and changes in the spectrum following erythema was described. From the preliminary study, the slop of the spectrum in the rane 580-600 nm can be classified the normal and erythematous skin surface. The results in 15 subjects showed a linear increase in the slope in the range between 580-600 nm.4) Optical power-feedWe have developed an optical power feed system using high-power laser and solar cell. The power of laser light illuminated solar cell via optical fiber. We could obtained enough power to operate very low-powered circuit less than 10 mW.We need further investigation for improving the energy efficiency. Less

光纤传感器在生物医学领域具有广阔的应用前景。具有许多优点，即，它体积小，不受电磁干扰，防触电，便宜。本研究的目的是开发和评价光纤传感器和驱动器。1）光电容积描记法心率和呼吸率监测将光电容积描记法（PPG）与小波变换信号采集相结合，研制了心率和呼吸率同步监测系统。PPG信号，其中包括心脏和呼吸的同步组件被测量在手指与光纤反射模式PPG设置。采用不同层次的小波函数从PPG信号中区分心脏和呼吸信号。2）激光多普勒血流信号中的组织运动伪影组织基质在激光多普勒血流信号的影响下持续运动，组织基质在激光多普勒血流信号的作用下持续运动。 ...更多信息由循环和呼吸系统产生的力。本文提出的假设是，组织基质的运动是否会在激光多普勒记录中产生一个错误信号，该信号被误解为仅仅是血流信号。在前臂的皮肤运动的测量已在3个网站和相应的光谱进行了比较与血流频谱记录与激光多普勒方法。这两种类型的频谱彼此重叠，表明运动引起的信号可以被解释为血流信号。组织运动对血流的贡献随研究的特定部位而变化很大。3）用于评估UV诱导的组织损伤的反射光谱法将反射光谱法应用于宽光谱光通过光纤传输到研究的组织。一部分散射光被另一组光学纤维接收。计算漫反射光谱并描述红斑后光谱的变化。初步研究表明，在580-600 nm范围内的光谱斜率可将正常皮肤表面与病变皮肤表面区分开来。15个受试者的实验结果表明，在580-600 nm范围内，斜率呈线性增加。4）光学馈电我们开发了一种使用高功率激光器和太阳能电池的光学馈电系统。激光的功率通过光纤照射到太阳能电池上。我们可以获得足够的功率来运行小于10 mW的低功耗电路，但需要进一步的研究来提高能量效率。少