CN203965028U - Ultra-sensitivity nautical receiving set based on surface plasma body resonant vibration - Google Patents
Ultra-sensitivity nautical receiving set based on surface plasma body resonant vibration Download PDFInfo
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Abstract
基于表面等离子体共振的超灵敏度水听器,其特征包括激光光源,光隔离器,偏振控制器,2×1耦合器,单模传输光纤,侧边抛磨单模光纤,空气间隙,镀有金膜的类“喇叭”SPR传感器,全反射膜,光电探测器,数据采集卡(DAC)和PC机;所述空气间隙由侧边抛磨单模光纤和镀有金膜的类“喇叭”SPR传感器组成;所述侧边抛磨光纤、空气间隙和镀有金膜的类“喇叭”SPR传感器组成光纤振动传感头;外界环境振动作用于类“喇叭”SPR传感器的金膜,使之发生振动,空气间隙发现变化,使SPR谱的发生变化,通过检测特定波长处的强度,可以实现振动测量。本实用新型提出一种具有实用、低成本、超灵敏度、强度检测的基于表面等离子体共振的超灵敏度水听器。
Super-sensitivity hydrophone based on surface plasmon resonance, characterized by laser light source, optical isolator, polarization controller, 2×1 coupler, single-mode transmission fiber, side-polished single-mode fiber, air gap, plated Gold film-like "horn" SPR sensor, total reflection film, photodetector, data acquisition card (DAC) and PC; The SPR sensor is composed of; the side-polished optical fiber, the air gap and the "horn" SPR sensor coated with gold film form an optical fiber vibration sensor head; the vibration of the external environment acts on the gold film of the "horn" SPR sensor to make it Vibration occurs, the air gap is found to change, and the SPR spectrum changes. Vibration measurement can be realized by detecting the intensity at a specific wavelength. The utility model proposes a super-sensitivity hydrophone based on surface plasma resonance with practicality, low cost, super-sensitivity and intensity detection.
Description
技术领域 technical field
本实用新型属于光纤传感技术领域,特别涉及基于表面等离子体共振的超灵敏度水听器。 The utility model belongs to the technical field of optical fiber sensing, in particular to a super-sensitivity hydrophone based on surface plasma resonance. the
背景技术 Background technique
表面等离子体共振(Surface Plasmon Resonance,简称SPR)是指当光源发出的P型偏振复色光经过薄膜金属与介质的交界面时,若满足入射角大于全反射临界角,在表面上形成了电子浓度的梯度分布,形成等离子体振荡,形成表面等离子体波,由于表面倏逝波场与金属复折射率的存在,使满足谐振波长的光部分被吸收,其余波长的光被反射的现象。1968年,德国物理学家Otto和Kretschmann各自采用(AttenuatedTotal Reflection,简称ATR)的方法在实验中实现了光频波段的表面等离子体的激发。1993年,Jorgenson等人在实验上实现了基于SPR的光纤化工传感器,相比于棱镜SPR传感器,它具有体积小、响应快、成本低、可以实现在线实时监测等优势,有着更大的研究前景和经济价值。 Surface Plasmon Resonance (SPR) means that when the P-type polarized polychromatic light emitted by the light source passes through the interface between the thin film metal and the medium, if the incident angle is greater than the critical angle of total reflection, an electron concentration is formed on the surface. Due to the existence of the surface evanescent wave field and the complex refractive index of the metal, the light that satisfies the resonance wavelength is partially absorbed, and the light of the remaining wavelengths is reflected. In 1968, German physicists Otto and Kretschmann respectively used the (Attenuated Total Reflection, ATR) method to realize the excitation of surface plasmons in the optical frequency band in experiments. In 1993, Jorgenson et al. realized the SPR-based optical fiber chemical sensor experimentally. Compared with the prism SPR sensor, it has the advantages of small size, fast response, low cost, and online real-time monitoring. It has greater research prospects. and economic value. the
自第二次世界大战之后以来,水声技术在军事需求的强势推动下得到了长足的发展,声场是收集、传递和处理海洋深层信息的重要方式,光纤水听器是一种建立在光纤、光电子技术基础上的水下声信号振动传感器,主要用于海洋声学环境中的声传播、噪声、混响、海底声学特性、目标声学特性等的监测。光纤水听器主要分为强度型、偏振型和相位干涉型,其中干涉型为目前研究的热点。干涉型光纤水听器是利用声波对单模光纤线圈中光的相位进行调制,使得传感光纤线圈发生弹性效应和应变效应,光纤线圈产生振动作为传感单元。目前报道中有采用圆柱体中空自由溢水式结构,传感臂光纤缠绕在外层弹性体上,参考臂光纤缠绕在内层弹性体上作为声波振动探头,这种结构灵敏度主要取决于弹性体的灵敏度,灵敏度低且结构复杂;有人利用简易支架结合长周期光纤光栅作为水听器的振动传感器,这种设计机械结构相对简化,但长周期光纤光栅易受交叉温度、折射率、应变等交叉参数的影响,因此需要复杂的信号解系统;中船重工715研究所联合浙江大学报道了采用金属弹片作为增敏结构的光纤光栅振动传感器作为水听器的探头,Michelson干涉仪进行解调,该结构相比前面报道灵敏度有所增加,但成本增加。这些作为光纤水听器的振动传感器要不结构复杂,要不解调设备昂贵,要不就需要复杂的数据处理过程,而且整体上每一种结构的灵敏度不高,这些振动传感器的缺点严重阻碍光纤水听器的发展和应用。 Since the Second World War, hydroacoustic technology has been greatly developed under the strong impetus of military needs. The sound field is an important way to collect, transmit and process deep ocean information. The underwater acoustic signal vibration sensor based on optoelectronic technology is mainly used for the monitoring of sound propagation, noise, reverberation, submarine acoustic characteristics, target acoustic characteristics, etc. in the marine acoustic environment. Optical fiber hydrophones are mainly divided into intensity type, polarization type and phase interference type, among which the interference type is the focus of current research. Interferometric fiber optic hydrophones use sound waves to modulate the phase of light in a single-mode fiber optic coil, causing elastic and strain effects to occur in the sensing fiber optic coil, and the fiber optic coil vibrates as a sensing unit. In current reports, there is a cylindrical hollow free overflow structure, the optical fiber of the sensing arm is wound on the outer elastic body, and the optical fiber of the reference arm is wound on the inner elastic body as an acoustic vibration probe. The sensitivity of this structure mainly depends on the sensitivity of the elastic body , low sensitivity and complex structure; some people use a simple bracket combined with a long-period fiber grating as a vibration sensor for a hydrophone. Therefore, a complex signal solution system is required; the 715 Research Institute of CSIC and Zhejiang University have reported that a fiber grating vibration sensor using metal shrapnel as a sensitization structure is used as a probe of a hydrophone, and a Michelson interferometer is used for demodulation. Sensitivity has increased compared to previously reported, but cost has increased. These vibration sensors used as optical fiber hydrophones are either complicated in structure, expensive in demodulation equipment, or require complex data processing, and the sensitivity of each structure is not high as a whole. The shortcomings of these vibration sensors seriously hinder Development and application of fiber optic hydrophone. the
针对上述光纤水听器中振动传感头结构复杂、测量成本高、数据处理复杂、灵敏度低等问题,本实用新型提出一种基于表面等离子体共振的超灵敏度水听器。本实用新型中以类“喇叭”结构底部镀金膜作为声波接收头,与侧边抛磨单模光纤构成的光纤SPR振动传感头,随着声波振动,金膜与光纤间的间隙发生变化,从而使得SPR谐振波长发生变化。 因此,本实用新型提出的基于表面等离子体共振的超灵敏度水听器能够实现微小振动的超灵敏度传感,结构简单,成本低,具有很强的实用价值。 Aiming at the problems of complex structure, high measurement cost, complex data processing, and low sensitivity of the vibration sensing head in the above optical fiber hydrophone, the utility model proposes a super-sensitivity hydrophone based on surface plasmon resonance. In the utility model, the gold-plated film at the bottom of the "horn" structure is used as the sound wave receiving head, and the optical fiber SPR vibration sensing head composed of side polished single-mode optical fiber, with the sound wave vibration, the gap between the gold film and the optical fiber changes. As a result, the SPR resonance wavelength changes. Therefore, the super-sensitivity hydrophone based on surface plasmon resonance proposed by the utility model can realize super-sensitivity sensing of tiny vibrations, has a simple structure, low cost, and has strong practical value. the
实用新型内容 Utility model content
为了克服光纤水听器中振动传感头结构复杂、测量成本高、数据处理复杂、灵敏度低等问题,本实用新型提出了一种结构简单、超灵敏度、低成本、实用性强的基于表面等离子体共振的超灵敏度水听器。 In order to overcome the problems of complex structure, high measurement cost, complex data processing and low sensitivity of the vibration sensing head in the optical fiber hydrophone, the utility model proposes a surface plasmon-based sensor with simple structure, super sensitivity, low cost and strong practicability. Body resonance ultra-sensitivity hydrophone. the
本实用新型为解决技术问题所采取的技术方案: The technical scheme that the utility model takes for solving technical problems:
基于表面等离子体共振的超灵敏度水听器,包括:激光光源、光隔离器、偏振控制器、2×1耦合器、单模传输光纤、侧边抛磨单模光纤、镀有金膜的类“喇叭”SPR传感器、全反射膜、光电探测器、数据采集卡(DAC)以及PC机。 Super-sensitivity hydrophone based on surface plasmon resonance, including: laser light source, optical isolator, polarization controller, 2×1 coupler, single-mode transmission fiber, side-polished single-mode fiber, gold-coated class "Horn" SPR sensor, total reflection film, photodetector, data acquisition card (DAC) and PC. the
激光光源的输出端与光隔离器输入端相连,光隔离器的输出端与偏振控制器相连,2×1耦合器有两端口的一端分别于偏振控制器的输出端和光电探测器相连,数据采集卡(DAC)分别与光电探测器的输出端和PC机相连,其中光电探测器具有时间响应特性;2×1耦合器的一端口的一端与单模传输光纤的一端相连,单模传输光纤的另一端与侧边抛磨单模光纤未镀膜的一端相连,侧边抛磨单模光纤的另一端镀有全反射膜。侧边抛磨单模光纤和镀有金膜的类“喇叭”SPR传感器形成空气间隙,侧边抛磨单模光纤剩余包层的厚度在50nm~250nm之间,空气间隙的宽度在1nm~12nm之间,金膜厚度在40nm~70nm之间,表面粗糙度的均方根小于等于5nm,且镀金膜的金属薄膜具有很好的弹性、柔韧性且厚度在1mm~5mm之间,全反射膜对谐振波长的反射率大于等于90%;由侧边抛磨单模光纤、空气间隙、镀有金膜的类“喇叭”SPR传感器组成超灵敏度光纤振动传感头。光电探测器和数据采集卡(DAC)作为SPR传感器的解调器。 The output end of the laser source is connected to the input end of the optical isolator, the output end of the optical isolator is connected to the polarization controller, and one end of the 2×1 coupler with two ports is respectively connected to the output end of the polarization controller and the photodetector, and the data The acquisition card (DAC) is respectively connected with the output end of the photodetector and the PC, wherein the photodetector has time response characteristics; one end of one port of the 2×1 coupler is connected with one end of the single-mode transmission fiber, and the single-mode transmission fiber The other end of the side-polished single-mode fiber is connected to the uncoated end of the side-polished single-mode fiber, and the other end of the side-polished single-mode fiber is coated with a total reflection film. The side-polished single-mode fiber and the "horn" SPR sensor coated with gold film form an air gap, the thickness of the remaining cladding of the side-polished single-mode fiber is between 50nm and 250nm, and the width of the air gap is between 1nm and 12nm Between, the thickness of the gold film is between 40nm and 70nm, the root mean square of the surface roughness is less than or equal to 5nm, and the metal film of the gold-plated film has good elasticity and flexibility and the thickness is between 1mm and 5mm. The total reflection film The reflectivity of the resonant wavelength is greater than or equal to 90%; the ultra-sensitive fiber optic vibration sensor head is composed of a side-polished single-mode fiber, an air gap, and a gold-coated "horn" SPR sensor. A photodetector and a data acquisition card (DAC) act as a demodulator for the SPR sensor. the
本实用新型的有益效果为: The beneficial effects of the utility model are:
本实用新型利用侧边抛磨单模光纤、空气间隙、镀有金膜的类“喇叭”SPR传感器作为超灵敏度光纤振动传感头,当外界环境发生振动时,镀有金膜的类“喇叭”SPR传感器的镀金薄膜也发生振动,空气间隙的宽度随着振动发生变化,则使得SPR光谱发生变化,通过检测待定波长处的强度,可以实现超灵敏度的振动测量。 The utility model uses the side-polished single-mode optical fiber, the air gap, and the "horn" SPR sensor coated with gold film as the ultra-sensitivity optical fiber vibration sensor head. When the external environment vibrates, the "horn" plated with gold film "The gold-plated thin film of the SPR sensor also vibrates, and the width of the air gap changes with the vibration, which causes the SPR spectrum to change. By detecting the intensity at the undetermined wavelength, ultra-sensitive vibration measurement can be realized. the
本实用新型利用全反射膜作为反射镜,结构简单,实现高灵敏度的振动反射式测量。 The utility model uses a total reflection film as a reflection mirror, has a simple structure, and realizes high-sensitivity vibration reflection measurement. the
本实用新型中解调系统使用光电探测器,实现光强度的检测,避免了昂贵的光谱解调仪等波长检测设备的使用,降低了成本。 The demodulation system in the utility model uses a photoelectric detector to realize the detection of light intensity, avoids the use of wavelength detection equipment such as an expensive spectrum demodulator, and reduces the cost. the
附图说明 Description of drawings
图1为基于表面等离子体共振的超灵敏度水听器结构示意图。 Figure 1 is a schematic diagram of the structure of a super-sensitivity hydrophone based on surface plasmon resonance. the
具体实施方式 Detailed ways
下面结合附图对实用新型进一步描述。 The utility model is further described below in conjunction with accompanying drawing. the
如图1所示,基于表面等离子体共振的超灵敏度水听器,包括激光光源1,光隔离器2,偏振控制器3,2×1耦合器4,单模传输光纤5,侧边抛磨单模光纤6,空气间隙7,镀有金膜的类“喇叭”SPR传感器8,全反射膜9,光电探测器10,数据采集卡(DAC)11和PC机12。激光光源1的输出端与光隔离器2相连,光隔离器2的输出端与偏振控制器3相连,2×1耦合器4的两端口的一端分别与偏振控制器3的输出端和光电探测器10输入端相连,2×1耦合器4的一端口一端与单模传输光纤5的一端相连,单模传输光纤5的另一端与侧边抛磨单模光纤6未镀膜的一端相连,镀有金膜的类“喇叭”SPR传感器8与侧边抛磨单模光纤6构成空气间隙7,侧边抛磨单模光纤6的另一端镀有全反射膜9,数据采集卡(DAC)11分别与光电探测器10输出端和PC机12相连。P偏振光由激光光源1、光隔离器2以及偏振控制器3结构产生;由侧边抛磨单模光纤6、空气间隙7和镀有金膜的类“喇叭”SPR传感器8组成超灵敏度光纤振动传感头,侧边抛磨单模光纤6剩余包层的厚度在50nm~250nm之间,空气间隙7的宽度在1~12nm之间,镀有金膜的类“喇叭”SPR传感器8作为SPR传感区,金膜厚度在40nm~70nm之间,表面粗糙度的均方根小于等于5nm,镀有金膜的金属薄膜具有很好的弹性、柔韧性且厚度在1mm~5mm之间;全反射膜9对谐振波长的反射率大于等于90%;光电探测器10、数据采集卡11以及PC机12组成信号解调部分。 As shown in Figure 1, the super-sensitivity hydrophone based on surface plasmon resonance includes a laser light source 1, an optical isolator 2, a polarization controller 3, a 2×1 coupler 4, a single-mode transmission fiber 5, and side polishing Single-mode optical fiber 6, air gap 7, gold-plated "horn"-like SPR sensor 8, total reflection film 9, photodetector 10, data acquisition card (DAC) 11 and PC 12. The output end of the laser light source 1 is connected to the optical isolator 2, the output end of the optical isolator 2 is connected to the polarization controller 3, and one end of the two ports of the 2×1 coupler 4 is respectively connected to the output end of the polarization controller 3 and the photodetector Connect to the input end of the device 10, one port and one end of the 2×1 coupler 4 are connected to one end of the single-mode transmission fiber 5, and the other end of the single-mode transmission fiber 5 is connected to the uncoated end of the side-polished single-mode fiber 6. The "horn" SPR sensor 8 with a gold film and the side-polished single-mode fiber 6 form an air gap 7, the other end of the side-polished single-mode fiber 6 is coated with a total reflection film 9, and the data acquisition card (DAC) 11 They are respectively connected to the output end of the photodetector 10 and the PC 12 . P polarized light is generated by the structure of laser light source 1, optical isolator 2 and polarization controller 3; super-sensitive fiber is composed of side-polished single-mode fiber 6, air gap 7 and gold-coated "horn" SPR sensor 8 The vibrating sensor head, the thickness of the remaining cladding of the side-polished single-mode optical fiber 6 is between 50nm and 250nm, the width of the air gap 7 is between 1 and 12nm, and the gold-coated "horn" SPR sensor 8 is used as In the SPR sensing area, the thickness of the gold film is between 40nm and 70nm, and the root mean square of the surface roughness is less than or equal to 5nm. The metal film coated with gold film has good elasticity and flexibility, and the thickness is between 1mm and 5mm; The reflectance of the total reflection film 9 to the resonant wavelength is greater than or equal to 90%; the photodetector 10, the data acquisition card 11 and the PC 12 form a signal demodulation part. the
本实用新型的工作方式为:激光光源1产生信号光,由单模传输光纤输入到光隔离器2,光隔离器2输出的光信号通过偏振控制器3控制输出变成P偏振光,P偏振光由2×1耦合器4的2_1端口输入,从1×2耦合器4的1_1端口输出的P偏振光通过单模传输光纤5传输到侧边抛磨光纤6,由于侧边抛磨光纤包层的厚度减少,纤芯和包层的一些模式以倏逝波的形式耦合到空气间隙7中传输,空气间隙7中传输的模式的光波在镀有金膜的类“喇叭”SPR传感器8的金膜界面,发生SPR效应,产生SPR效应的光波以表面等离子波的形式存在,剩余的光波继续传播,经全反射膜9全反射,再次经过空气间隙7,在镀有金膜的类“喇叭”SPR传感器8的金膜界面发生SPR效应,产生SPR效应的谐振波长的光由2×1耦合器4的2_2端口输出被带有时间响应特性的光电探测器10接收,光电探测器10将所得的光信号转变为电信号,得到的电信号经过整形、滤波、放大被数据采集卡(DAC)11采集,由数据采集卡(DAC)11采集的信号输入到PC机12经行数据显示和分析。由侧边抛磨光纤、空气间隙和镀有金膜的类“喇叭”SPR传感器组成的光纤振动传感头对空气间隙的变化非常敏感,随着空气间隙的增大,产生SPR效应的谐振波长向短波漂移,并且漂移量与空气间隙的变化量具有很好的线性度。当外界环境发生振动时,作用于光纤振动传感头的镀有金膜的类“喇 叭”SPR传感器的金属薄膜,发生振动,导致空气间隙的宽度随着振动频率的变化而变化,进而使得SPR光谱发生变化,通过检测待定波长处的强度,可以实现超灵敏度的振动测量。 The working mode of the utility model is as follows: the signal light generated by the laser light source 1 is input to the optical isolator 2 by the single-mode transmission optical fiber, and the optical signal output by the optical isolator 2 is controlled by the polarization controller 3 to become P polarized light, and the P polarized light The light is input from the 2_1 port of the 2×1 coupler 4, and the P-polarized light output from the 1_1 port of the 1×2 coupler 4 is transmitted to the side-polished fiber 6 through the single-mode transmission fiber 5, because the side-polished fiber package The thickness of the layer is reduced, and some modes of the core and cladding are coupled into the air gap 7 in the form of evanescent waves, and the light waves of the modes transmitted in the air gap 7 are transmitted by the gold-coated "horn" SPR sensor 8. Gold film interface, SPR effect occurs, and the light wave that produces SPR effect exists in the form of surface plasma wave, and the remaining light wave continues to propagate, is totally reflected by the total reflection film 9, passes through the air gap 7 again, and is coated with a gold film. The SPR effect occurs at the gold film interface of the SPR sensor 8, and the light of the resonant wavelength that produces the SPR effect is output by the 2_2 port of the 2*1 coupler 4 and received by the photodetector 10 with time response characteristics, and the photodetector 10 converts the obtained The optical signal is converted into an electrical signal, and the obtained electrical signal is collected by a data acquisition card (DAC) 11 through shaping, filtering, and amplification, and the signal collected by the data acquisition card (DAC) 11 is input to a PC 12 for data display and analysis . The fiber optic vibration sensing head composed of side-polished optical fiber, air gap and gold-coated "horn" SPR sensor is very sensitive to the change of the air gap. As the air gap increases, the resonant wavelength of the SPR effect will be generated. Drift to shortwave, and the drift amount has a good linearity with the change of the air gap. When the external environment vibrates, the metal thin film of the gold-plated "horn" SPR sensor acting on the optical fiber vibration sensing head vibrates, causing the width of the air gap to change with the vibration frequency, which in turn makes the The SPR spectrum changes, and by detecting the intensity at an undetermined wavelength, ultra-sensitive vibration measurements can be achieved. the
该装置能够实现基于表面等离子体共振的超灵敏度水听器的强度测量的关键技术有: The key technologies for this device to realize the intensity measurement of super-sensitivity hydrophones based on surface plasmon resonance are:
1、光纤振动传感头的结构。由侧边抛磨光纤、空气间隙和镀有金膜的类“喇叭”SPR传感器构成的光纤振动传感头结构是实现超灵敏度传感的基础。 1. The structure of the optical fiber vibration sensing head. The optical fiber vibration sensing head structure composed of side-polished optical fiber, air gap and gold-coated "horn" SPR sensor is the basis for realizing ultra-sensitive sensing. the
2、空气间隙的宽度。SPR的谐振波长会随着空气间隙的厚度发生漂移,当超过一定范围时,耦合到空气间隙的倏逝波无法激发金属内部的自由电荷并产生表面等离子波,因此,侧边抛磨光纤与镀有金膜的类“喇叭”SPR传感器形成的空气间隙的宽度应严格控制在1nm~12nm之间。 2. The width of the air gap. The resonant wavelength of SPR will drift with the thickness of the air gap. When it exceeds a certain range, the evanescent wave coupled to the air gap cannot excite the free charges inside the metal and generate surface plasmon waves. The width of the air gap formed by the "horn" SPR sensor with a gold film should be strictly controlled between 1nm and 12nm. the
3、侧边抛磨光纤剩余包层的厚度。随着包层厚度的减小,会使得越来越多的纤芯模耦合到空气间隙,但要是包层太薄,会导致出现模式不匹配,使得纤芯模完全泄露,损耗太大;太厚导致耦合到空气间隙的模式太少,SPR耦合效率降低,因此剩余包层的厚度应控制在50nm~250nm之间。 3. The thickness of the remaining cladding of the optical fiber is polished sideways. As the cladding thickness decreases, more and more core modes will be coupled to the air gap, but if the cladding is too thin, the mode mismatch will occur, causing the core mode to leak completely and the loss is too large; Thickness leads to too few modes coupled to the air gap, and the SPR coupling efficiency decreases, so the thickness of the remaining cladding should be controlled between 50nm and 250nm. the
4、镀有金膜的传感区金膜的厚度和粗糙度。金膜厚度会影响SPR的谐振波长谐振峰的尖锐程度和消光比,金膜表面的粗糙程度会影响表面等离子体的损失,进而影响SPR的性能,因此,金膜的厚度应严格控制40nm~70nm之间,金膜表面的粗糙度的均方根应小于等于5nm。 4. The thickness and roughness of the gold film in the sensing area coated with gold film. The thickness of the gold film will affect the sharpness of the resonant wavelength resonance peak of SPR and the extinction ratio, and the roughness of the surface of the gold film will affect the loss of surface plasmons, thereby affecting the performance of SPR. Therefore, the thickness of the gold film should be strictly controlled between 40nm and 70nm Between, the root mean square of the surface roughness of the gold film should be less than or equal to 5nm. the
5、镀金膜的金属薄膜对整个传感器的测量灵敏度影响很大,需要选择弹性和有韧性好的材料,且厚度在1mm~5mm之间。 5. The gold-plated metal film has a great influence on the measurement sensitivity of the entire sensor. It is necessary to choose a material with good elasticity and toughness, and the thickness is between 1mm and 5mm. the
6、侧边抛磨光纤的全反射膜对产生SPR效应的P偏振光反射率大于等于90%,同时该反射膜应尽量平滑;根据表面等离子体共振理论可知,只有P偏振光才能激发表面等离子体波(SPW),因此利用偏振控制器保证输入的侧边抛磨光纤的信号光为完全P偏振光;光源的稳定性也是SPR传感器误差的重要来源,应保证光源工作的稳定性。 6. The total reflection film of the side-polished optical fiber has a reflectivity greater than or equal to 90% for the P-polarized light that produces the SPR effect, and the reflective film should be as smooth as possible; according to the surface plasmon resonance theory, only P-polarized light can excite surface plasmons Bulk wave (SPW), so the polarization controller is used to ensure that the input signal light of the side-polished fiber is completely P-polarized light; the stability of the light source is also an important source of SPR sensor error, and the stability of the light source should be ensured. the
本实用新型的一个具体实施例中,Thorlabs的光纤耦合激光光源,型号S1FC635PM输出波长635nm;光隔离器型号为IO-2D-633-VLPa,工作波长为603-663nm,隔离度在35-40dB之间,;偏振控制器型号为FPC022,工作波长为600-800nm;侧边抛磨光纤纤芯直径为9μm,剩余包层的厚度为100nm,轴向长度为20μm;金膜厚度为50nm,表面粗糙度均方根为3.7nm;空气间隙的宽度为5nm;光纤选用G.652单模光纤;全反射膜的反射率为95%;带尾纤的光电探测器FDSP660,单模光纤,工作波长为610-770nm;同步数据采集卡KPCI-1818,8通道并行采集通道,采样频率为500KS/s,采样分辨率为12位;一台多频率发生器;一个扬声器。 In a specific embodiment of the present invention, the fiber-coupled laser light source of Thorlabs, the model S1FC635PM output wavelength is 635nm; Between,; the polarization controller model is FPC022, the working wavelength is 600-800nm; the side-polished fiber core diameter is 9μm, the thickness of the remaining cladding is 100nm, and the axial length is 20μm; the thickness of the gold film is 50nm, and the surface is rough The root mean square of the degree is 3.7nm; the width of the air gap is 5nm; the optical fiber is G.652 single-mode fiber; the reflectivity of the total reflection film is 95%; the photodetector with pigtail FDSP660, single-mode fiber, the working wavelength is 610-770nm; synchronous data acquisition card KPCI-1818, 8-channel parallel acquisition channels, sampling frequency is 500KS/s, sampling resolution is 12 bits; a multi-frequency generator; a loudspeaker. the
以上所述及图中所示的仅是本实用新型的优选实施方式。本领域的普通技术人员在不脱离本实用新型的原理的前提下,还可以作出若干变型和改进,这些也应视为属于本实用新型的保护范围。 What is described above and shown in the figure is only the preferred embodiment of the present utility model. Those skilled in the art can also make some modifications and improvements without departing from the principle of the utility model, and these should also be regarded as belonging to the protection scope of the utility model. the
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN104165684A (en) * | 2014-07-15 | 2014-11-26 | 中国计量学院 | Surface plasmon resonance-based supersensitive hydrophone |
CN105277513A (en) * | 2015-11-05 | 2016-01-27 | 中国计量学院 | Surface plasmon resonance refraction index sensor based on optical fiber micro-rings |
CN106840364A (en) * | 2017-04-07 | 2017-06-13 | 光子瑞利科技(北京)有限公司 | Reaction type optical fiber air based on Rayleigh scattering listens sound system |
CN110132396A (en) * | 2019-04-29 | 2019-08-16 | 中国科学院光电技术研究所 | A high-sensitivity underwater acoustic wave detection device and method based on a telescopic system |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN104165684A (en) * | 2014-07-15 | 2014-11-26 | 中国计量学院 | Surface plasmon resonance-based supersensitive hydrophone |
CN105277513A (en) * | 2015-11-05 | 2016-01-27 | 中国计量学院 | Surface plasmon resonance refraction index sensor based on optical fiber micro-rings |
CN105277513B (en) * | 2015-11-05 | 2023-08-29 | 中国计量大学 | Surface plasma resonance refractive index sensor based on optical fiber micro-ring |
CN106840364A (en) * | 2017-04-07 | 2017-06-13 | 光子瑞利科技(北京)有限公司 | Reaction type optical fiber air based on Rayleigh scattering listens sound system |
CN110132396A (en) * | 2019-04-29 | 2019-08-16 | 中国科学院光电技术研究所 | A high-sensitivity underwater acoustic wave detection device and method based on a telescopic system |
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