Optical fiber sensor with optical power feed

光纤传感器在生物医学领域具有广阔的应用前景。具有体积小、不受电磁干扰、电气安全、价格低廉等优点。本研究的目的是研制和评价光纤传感器和执行器。1)利用光体积描记技术实现心率和呼吸频率的同时监测。利用光体积图(PPG)和小波变换的信号采集相结合的方法，研制了一种同时监测心率和呼吸频率的系统。PPG信号包括心脏和呼吸同步成分，用光纤反射模式PPG装置在手指上测量。利用不同层次的小波函数对PPG信号中的心脏和呼吸信号进行区分。新仪器的精度可与现有的心脏和呼吸频率监测方法相媲美2)激光多普勒血流信号中的组织运动伪影组织基质在…的影响下连续运动循环系统和呼吸系统产生更多的力量。本文提出的假设是，在激光多普勒记录中，组织基质的运动是否会产生错误信号，该信号被误解为单纯的血流信号。对前臂3个部位的皮肤运动进行了测量，并与激光多普勒法记录的血流频谱进行了比较。这两种类型的频谱相互重叠，表明运动诱发信号可以解释为血流信号。组织运动对血流的贡献因研究部位的不同而有很大不同。3)反射光谱用于评估紫外线诱导的红斑反射光谱被应用于通过光纤将广谱光传输到粘连下的组织。一部分散射光被接收到另一组光纤维。计算漫反射光谱，描述红斑后漫反射光谱的变化。通过初步研究，在580-600 nm范围内的光谱斜率可以分为正常皮肤表面和红斑皮肤表面。15名受试者的测试结果表明，斜率在580-600 nm范围内呈线性增长。4)光功率馈电我们研制了一种采用高功率激光和太阳能电池的光功率馈电系统。激光的功率通过光纤照射太阳能电池。我们可以获得足够的功率来运行低于10兆瓦的极低功耗电路。我们需要进一步的研究来提高能量效率。较少

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