退火质子交换LiNbO3光波导的工艺研究

介绍了质子交换 Li Nb O3 光波导的制作工艺及光学特性测试 ,制作单模光波导的工艺条件及退火工艺。     

光纤磁场传感器的磁场探头设计

光纤磁场传感器的探头是光纤磁场传感器中最关键的部分，它直接影响到传感器的测量精度。根据光纤传感器的测量要求和磁敏元件(磁光晶体：BiGd：YIG-Y3-x-yBixGdyFe3O12)的工作原理及特点，必须在光纤磁场传感器探头中产生线偏振光，同时为了在磁敏元件加入传感器探头后不至于增加固有损耗，故在探头两端使用了两个光纤准直器。介绍了在探头设计中，各部分的工作原理和结构特点。     

用于光纤陀螺系统的GaAs集成光学波导器件研究

光纤陀螺是一种完全静止型的传感器，为了进一步缩小它的体积，提高它的性能，将其光学处理部件集成光学化是必不可少的。ＧａＡｓ材料具有优良的温度特性，抗辐射特性，以及优良的材料生长特性和微细加工特性，特别适合于要求高的光纤陀螺用的集成光学器件的研制。     

康耐视第三代Checker视觉传感器

康耐视公司Checker视觉传感器系列产品家族将新增Checker 3G.Checker 3G安装简便,将集成元件检测、照明系统、I／O以及工作变更都在一个坚固的IP67外罩中实现,能对生产线上所有的产品或元件进行简单可靠的验证。     

基于内壁芯光纤的调制器件

提出一种基于中空内壁悬挂芯光纤构造而成的光纤集成调制器.该光纤具有孔道结构,纤芯悬挂于孔道内壁.合成了含有超顺磁性Fe3O4纳米颗粒的磁流体,通过将空心光纤与多模光纤熔融连接,将磁流体封装在空心光纤内部,作为悬挂纤芯的包层.磁流体通过倏逝场对光产生吸收作用,由外磁场控制吸收强度,实现对纤芯的光调制.波长为632.8 nm的光经过拉锥耦合点耦合进入、传出调制元件.实验结果表明,在不同磁场强度下,仅仅2.0×10-3 μL的磁流体就可以对系统光衰减产生明显影响.当磁场强度为38 914 A/m时,饱和调制深度为43％;系统的响应时间低于120ms.该系统还可用于光开关,光纤滤波器和磁传感器等.     

光学免疫传感器技术与应用

较为系统地介绍了光学免疫传感器技术及应用，给出了光学免疫传感器的传感器原理和分类方法，与传统的免疫传感器对照，介绍了光学免疫传感器的特点和优势所在。着重介绍了几种重要和常用的光学免疫传感器，夹层光纤传感器，位移光纤传感器，表面等离子体共振传感器、光栅生物传感器，法布里-波罗脱生物传感器，直接感应光纤生物传感器等，给出了它们的传感器结构和检测机理，以及它们在实际中的大量应用实例。最后介绍了光学免疫传感器的发展趋势。     

时间分辨荧光光纤生物传感器的研制及应用

首次研制了一种完全利用光纤实现光耦合及传输的时间分辨荧光光纤生物传感器.该传感器以镧系离子(铕离子)作为被检测物质的荧光标记物,根据铕离子的荧光特性,利用时间分辨检测技术进行生物医学检测.光学部分采用光纤耦合器和石英光纤作生物样品激发光的传导光学元件,生物样品受激发产生的荧光也同样由光纤耦合器及光纤收集和传导,实现了该传感器的紧凑性和小型化,提高了检测灵敏度.经性能测试,该仪器不稳定性小于2.3%,重复测量的互相关高达99.9%.测铕离子标准液的检测限为7.3×10^-10g/L,达到国外有关文献报道的水平.     

集成光波导型电磁场传感器在长春研制成功

近日 ,中国科学院长春光机与物理所与日本东京大学合作研究的“集成光波导型电磁场传感器”在长春正式通过专家鉴定。在光电子高新技术领域中 ,以集成光学元件作为检测技术的应用研究具有广阔的前景 ,利用集成光波导技术的各种类型的传感器成为当代研究的热点 ,其发展战略目标朝着具有自诊断、适应环境变化 ,自动校正和自动补偿的多功能、智能化、集成化方向开拓。此次研制成功的集成光波导型电磁场传感器采用了集成光学技术 ,具有小型、轻便、带宽高、抗干扰、低功耗、无电源工作、工作频率范围可达数ＧＨ2、工作稳定、使用方便、可远距离…     

光学装配工艺对IM85—1型压力式光纤液位传感器系统的影响及研究

本文对IM85-1型压力式光纤液位传感器系统中光学元件装配工艺引起的误差进行了定性与定量的分析,研究制定了一套合理、精确的新装配工艺以消除各种装配误差的影响,保证传感器具有较高的灵敏度和稳定性.传感系统测量灵敏度达到0.2%.     

单模光纤耦合传感器的设计

以单模光纤耦合器的熔融区为传感元件的传感器是一种特殊和广泛应用前景的光学检测技术。本文分析了该传感器的敏感机理,依据单模光纤耦合传感器耦合输出是传感器耦合区长度和振动频率的函数关系,提出该种传感器可实现应变和振动检测。搭建了以微应变仪和等强度悬臂梁的应变和振动检测系统,设计了实验系统的每个单元,详细分析了耦合型光纤传感器的静态响应特性和温度、横向压力干扰影响,结果表明该类型传感器对应变的响应非常灵敏。通过与压电振动传感器的测试对比,得出该传感器可更好地实现低频和高频振动检测,并分析了其低频和高频的响应特性。耦合型光纤传感器耦合区材料、结构本身、制作工艺等因素将影响传感器的静、动态性能,面向实用化,需解决传感器存在的一些问题。     

Experimental studies on fiber optic sensors embedded in concrete

Embedded fiber optic sensors are quite suitable for quantitative non-destructive long-term monitoring of concrete structures. Fiber optic sensors can be embedded in different types of structures, such as, buildings, roads, bridges, dams, etc. for monitoring different physical parameters like strain, temperature, deformation, etc. Bare fiber optic sensors are not suitable for directly embedding in concrete. Hence, some form of protective mechanism needs to be provided to the fragile fiber optic sensor for reliable performance. Suitable protective encapsulation to the bare sensor should ensure that there is no relative slip at the interface of the matrix concrete and the encapsulation. Investigations carried out to develop technique of embedding fiber optic sensor in concrete and performance evaluation of the developed embedment techniques are presented.     

光纤光栅内锥式流量计的研究

光纤光栅传感技术具有光纤传感技术的所有优点,内锥式流量传感器具有量程比大,压损较小,耐高温高压,要求前后直管段长度小的特点。将光纤光栅和内锥流量传感器结合组成了新型的光纤光栅内锥式流量计,介绍了光纤光栅和内锥式流量传感器的工作原理,光纤光栅内锥式流量计的组成。实验数据和结论。     

利用光纤曲率传感器重建三维曲面结构

为了实现对弯曲结构的三维空间数据的测量与重建,建立了光纤曲率传感器的准分布式测量系统。对该系统中传感器的布置方式、空间弯曲曲率和扭转角的测量及三维结构重建方法进行了研究。首先,将光纤曲率传感器绕成环形,布置在柔性基底的两个对称表面,组成准分布式测量系统。根据线性叠加原理,同时测量出结构的弯曲和扭转变形。使用光纤曲率传感器提供的弯曲和扭转信息,采用微分几何的方法,建立由曲线切线和曲率确定的运动坐标系,在运动坐标系中根据空间结构的扭转角确定密切平面。然后,在密切平面中进行曲线的弯曲计算和运动坐标系的变换分析,并进行拟合过程的公式推导。最后,对该方法进行了试算验证,并利用准分布式测量系统对两支点间距为500 mm的简支梁进行了结构重建。结果显示,在相邻两检测点进行20点插值时,简支梁曲线的最大偏差为1.1 mm,表明设计的系统和重建方法能够较高精度地实现曲面结构的三维重建。     

光纤陀螺技术研究

介绍光纤陀螺原理，集成光器件及相关检测技术。     

Effect of elastomer characteristics on fiber optic force sensing performance in biomedical robotics applications

Miniaturized and “smart” sensors are required for research in biology, physiology, and biomechanics, and they have extremely important clinical applications for diagnostics and minimally invasive surgery. Fiber optic sensors have been proven to provide advantages compared to conventional sensors and high potential for biomechanical and biomedical applications. They are small, easy to operate, minimally invasive with low risk, more accurate, and inexpensive. This paper reports the design and modeling of a fiber optic force sensor that is capable of measuring compliance for a contact force of up to 1 N. The main objective of this study is to design and model a fiber optic sensor capable of measuring the total force applied on an object. A polydimethylsiloxane (PDMS) elastomer film with a thickness of 1.2 mm is placed between an optical fiber tip and an object, and it is used for measuring the force applied on a rigid element. The compliance of the fiber optic force sensor is measured by recording the response of PDMS elastomer films under different load conditions. We use finite element modeling results as a basis for comparing experimental data. The agreement between theoretical predictions and experimental data is reasonable and within an acceptable range.     

Laser, fiber optic, and CCD array sensing systems

Lasers and fiber optics have recently been accepted in industry for sensing as well as for communications. Charge-coupled devices (CCD) and charge-injection devices (CID) are important new solid-state image sensors for fast display inputs to computers. The sensors may be coupled in a sensor fusion system by optical fibers to bring to the plant floor the advantages of intrinsic safety and immunity to radio frequency, electromagnetic, and optical noise. These new developments in sensing by lasers, fiber optics, and CCD arrays may be applied singly or in combination. For example, improved Raman spectroscopy employs a hostile environment fiber optic probe interface, an infrared laser diode to avoid fluorescence, and a CCD array detector for better sensitivity. We will examine recent developments that will help us with rapid, accurate real-time information for better monitoring and control.     

Optimization of the frequency-modulated continuous wave technique for referencing and multiplexing intensity-based fiber optic sensors

In this paper, we demonstrate the interrogation of fiber optic intensity sensors by using the combination of the frequency-modulated continuous wave concept with the spectral selective reflectivity of fiber Bragg gratings. Thus, we multiplex these kinds of sensors with this technique having simultaneously a referenced system. The basis of this dual functionality is described and results are presented for the case of interrogation of two multiplexed intensity sensors. Their evaluation permits to establish the conditions to address a sensor network of this type. Also, it is proposed a strategy to implement this sensing approach without the requirement of using optical fiber delay lines in the sensor heads.     

膜片式微型F-P腔光纤压力传感器

为满足工业和生物医学领域对微型化传感器的需求,实验研究了基于Fabry-Perot(F-P)干涉仪原理的膜片式微型光纤压力传感器的制作工艺.在单模光纤端面上直接熔接外径约175 μm的毛细石英管,在石英管的另一端制作敏感膜片,从而使光纤端面与膜片内表面之间形成F-P干涉腔.采用电弧熔接、切割、腐蚀膜片等方法制作了石英膜片式压力传感器,该传感器在0～3.1 MPa内F-P腔的腔长变化灵敏度为41.09 nm/MPa,压强测量分辨率为681 Pa,并具有很小的温度敏感系数.在30～140 ℃,温度交差敏感＜1.07 kPa/℃.为了克服石英膜片减薄困难的缺点,选用聚合物材料(PSQ)作为压力敏感膜片制作了F-P传感器.室温下在0.1～2.1 MPa,PSQ膜片的F-P腔长变化灵敏度达到1 886.85 nm/MPa,压强测量分辨率达到53 Pa,十分接近人类或其他动物的体内压强测量水平.     

Fiber optic displacement sensor with a large extendable measurement range while maintaining equally high sensitivity, linearity, and accuracy

This paper presents a fiber optic displacement sensor composed of a transmissive grating panel, a reflection mirror, and two optical fibers as a transceiver. The proposed fiber optic displacement sensor guarantees a stable reflected signal acquisition for application in real industrial fields. Through a parametric study of the grating pitch of the transmissive grating panel, the signal-to-noise ratio, linearity, resolution, accuracy error, and sensitivity of the proposed sensor were investigated. The measured bidirectional movement demonstrated a peak to peak accuracy of 10.5 μm, high linearity of 0.9996, resolution of 3.1 μm at the full bandwidth, signal-to-noise ratio of 27.7, and high sensitivity of 31.8 μm/rad during a movement of 16,004.0 μm using the transmissive grating panel, which had a grating pitch of 200 μm. Even for an extended measurement range, the proposed scheme enables the same accuracy, linearity, and sensitivity to be maintained when compared with conventional laser displacement sensors and fiber optic displacement sensors.