光纤传感器

This article focuses on the functionality verification of a novel non-invasive fibre-optic sensor monitoring basic vital signs such as Respiratory Rate (RR), Heart Rate (HR) and Body Temperature (BT). The integration of three sensors in one unit is a unique solution patented by our research team. The integrated sensor is based on two Fiber Bragg Gratings (FBGs) encapsulated inside an inert polymer (non-reactive to human skin) called PolyDiMethylSiloxane (PDMS).

In this article we report on the validation of a novel fiber-optic sensor system suitable for simultaneous cardiac and respiration activity monitoring during Magnetic Resonance Imaging (MRI) examinations. This MRI-compatible Heart Rate (HR) and Respiration Rate (RR) measurement system is based on the Fiber-optic Bragg Grating (FBG) sensors. Using our system, we performed real measurements on 4 test subjects (2~males and 2 females) after obtaining their written informed consents.

Here we present the evaluation results of our novel noninvasive phonocardiographic-based fiber-optic sensor for fetal Heart Rate (fHR) detection using adaptive filtering and the NLMS Algorithm. The sensor uses two interferometric probes encapsulated inside a PolyDiMethylSiloxane (PDMS) polymer. Based on real data acquired from pregnant women in a suitable research laboratory environment, once they had given their written informed consents, we created a simplified dynamic signal model of the distribution of maternal and fetal heart sounds inside the maternal body.

This article describes the design and the functional verification of fiber optic system with an innovative non-invasive measuring probe for monitoring respiratory and heart rate. The measuring probe is based on Fiber Bragg Grating (FBG), and it is encapsulated in the PolyDiMethylSiloxane polymer (PDMS). PDMS offers a unique combination of suitable properties for the use in biomedical applications. The main advantages include inert to human skin and immunity to electromagnetic interference. The measuring probe is a part of contact strip which is placed on the chest of the patient.

提出了一种具有聚二甲基硅氧烷( PDMS )包复锥形色散补偿光纤( DCF )结构的高灵敏度光纤温度传感器，该结构由单模光纤( SMF ) -锥形色散补偿-单模光纤( STDS )组成，传感原理是基于DCF与SMF之间由于大芯径失配而产生的干涉。这种复合结构的干涉容易受到周围折射率( SRI )的影响，最终导致透射谱的干涉倾角发生变化。温敏PDMS复盖了锥形色散补偿区域，在实际应用中可以增加温度传感器的灵敏度，保护微结构，提高结构的可靠性。实验温度结果验证了 ，传感器在20 ° C ~ 100 ° C范围内的最大温度灵敏度为0.22 nm / ° C，在此范围内重复性良好。与原始光纤传感器和PDMS涂层光纤相比，温度灵敏度分别提高了5.2倍和2.24倍。该传感器结构紧凑、灵敏度高、加工简单，可实际应用于生化传感和工业结构健康检测领域。

本文报道了一种超紧凑型反射式SPR微尖温度探针，可实现数微米的二维空间分辨率。我们提出的铅笔形全光纤微尖是一个长度为40   μ m、梯度直径为2   μ m ~ 10   μ m的SO2圆锥柱体，开发多类型的微功能化传感器。由于超细微尖的强倏逝场，在其表面沉积纳米银( Ag )薄膜可以有效激发表面等离子体共振( SPR )。由于SPR效应的高折射率( RI )灵敏度和聚二甲基硅氧烷( PDMS )的高热光系数( TOC )，涂复PDMS微米膜的微尖SPR探针的温度灵敏度可达1.985   nm / ° C。在SPR温度计表面涂复Teflon 1600纳米膜可以有效增强其不粘性、防潮性和耐磨性。测试结果表明，探头几乎不受湿度的干扰。这种新型传感平台可以通过组装高性能传感材料和超致密的光纤结构来演示。