CN118129939A - Fluorescent optical fiber temperature measurement light path coupling and photoelectric demodulation module - Google Patents
Fluorescent optical fiber temperature measurement light path coupling and photoelectric demodulation module Download PDFInfo
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- G—PHYSICS
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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Abstract
本发明提供一种荧光光纤测温光路耦合及光电解调模块，涉及温度测量技术领域。该模块包括光路耦合结构组件、两个光纤接头、两个耦合透镜、激励光源、光电探测器和光电解调电路板；激励光源位于第一个耦合透镜焦点处；光电探测器位于第二个耦合透镜焦点处；两个耦合透镜、激励光源以及光电探测器分别设置在光路耦合结构组件的四个通孔内；两个光纤接头分别与设置耦合透镜的两个通孔连接；激励光源和光电探测器均与光电解调电路板电连接；第一个光纤接头、第一个耦合透镜和激励光源同轴直线依次对应设置，组成光源耦合光路；第二个光纤接头、第二个耦合透镜和光电探测器同轴直线依次对应设置，组成荧光耦合光路。
The present invention provides a fluorescent optical fiber temperature measurement optical path coupling and photoelectric demodulation module, which relates to the field of temperature measurement technology. The module includes an optical path coupling structure component, two optical fiber joints, two coupling lenses, an excitation light source, a photodetector and a photoelectric demodulation circuit board; the excitation light source is located at the focus of the first coupling lens; the photodetector is located at the focus of the second coupling lens; the two coupling lenses, the excitation light source and the photodetector are respectively arranged in four through holes of the optical path coupling structure component; the two optical fiber joints are respectively connected to the two through holes where the coupling lenses are arranged; the excitation light source and the photodetector are both electrically connected to the photoelectric demodulation circuit board; the first optical fiber joint, the first coupling lens and the excitation light source are coaxially arranged in line in sequence to form a light source coupling optical path; the second optical fiber joint, the second coupling lens and the photodetector are coaxially arranged in line in sequence to form a fluorescent coupling optical path.
Description
技术领域Technical Field
本发明涉及温度测量技术领域，尤其涉及一种荧光光纤测温光路耦合及光电解调模块。The invention relates to the technical field of temperature measurement, and in particular to a fluorescent optical fiber temperature measurement optical path coupling and photoelectric demodulation module.
背景技术Background technique
荧光光纤测温传感器是一种利用荧光余晖衰减寿命原理，实现温度测量的新型温度传感器，已在诸多领域获得应用。光路耦合及光电解调模块是该类型温度传感器研究设计、生产制造的关键之一，直接影响着该类型温度传感器的关键性能指标、加工工艺难度和产品制造成本。Fluorescent fiber temperature sensor is a new type of temperature sensor that uses the principle of fluorescence afterglow decay life to achieve temperature measurement. It has been applied in many fields. Optical path coupling and photoelectric demodulation module is one of the keys to the research, design, production and manufacturing of this type of temperature sensor, which directly affects the key performance indicators, processing difficulty and product manufacturing cost of this type of temperature sensor.
光路耦合及光电解调模块主要实现激励光源与光纤传感探头的光路耦合，荧光与光电探测器的光路耦合，电信号驱动及解调等功能。现有技术和产品，在光纤接头侧采用激励光和荧光复用光路；在模块内，采用半透半反滤波片，形成分光光路，耦合效率低；结构较复杂，加工工艺繁琐，制造成本高，易出现故障，一致性难以控制。The optical path coupling and photoelectric demodulation module mainly realizes the optical path coupling between the excitation light source and the optical fiber sensor probe, the optical path coupling between the fluorescence and the photoelectric detector, the electric signal driving and demodulation, etc. The existing technology and products use the excitation light and fluorescence multiplexing optical path on the optical fiber connector side; in the module, a semi-transparent and semi-reflective filter is used to form a split light path, and the coupling efficiency is low; the structure is complex, the processing technology is cumbersome, the manufacturing cost is high, it is easy to fail, and the consistency is difficult to control.
如发明专利申请CN105509926B《光路耦合装置及荧光温度传感光学系统》提供一种光路耦合装置及荧光温度传感光学系统，包括光纤接头、荧光激励光源、荧光探测器和滤波片，荧光激励光源与荧光探测器设置在同一块电路板的同一表面上；荧光探测器与滤波片相对设置，滤波片与光纤接头的光路上设置有耦合透镜；滤波片与耦合透镜均位于荧光激励光源与光纤接头之间的光路上。光路耦合装置还包括盒体，盒体设置有光学镜槽，滤波片位于光学镜槽内部。盒体还设置有通孔，光纤接头与耦合透镜位于通孔内。For example, the invention patent application CN105509926B "Optical Path Coupling Device and Fluorescence Temperature Sensing Optical System" provides an optical path coupling device and a fluorescence temperature sensing optical system, including an optical fiber connector, a fluorescence excitation light source, a fluorescence detector and a filter. The fluorescence excitation light source and the fluorescence detector are arranged on the same surface of the same circuit board; the fluorescence detector and the filter are arranged opposite to each other, and a coupling lens is arranged on the optical path between the filter and the optical fiber connector; the filter and the coupling lens are both located on the optical path between the fluorescence excitation light source and the optical fiber connector. The optical path coupling device also includes a box body, which is provided with an optical mirror groove, and the filter is located inside the optical mirror groove. The box body is also provided with a through hole, and the optical fiber connector and the coupling lens are located in the through hole.
如发明专利申请CN 109632130B《一种集成化的荧光测温光路模块装置》提供了一种集成化的荧光测温光路模块装置，包括：电路板，设置有信号处理电路，在电路板上安装有贴片式的光电二极管，所述光电二极管和信号处理电路电气连接；光纤探头；分光器，其左侧与电路板连接，右侧与光纤探头连接，在分光器底部安装有发光光源，并在分光器上设置有二相色镜和位于二相色镜右侧的聚焦透镜，所述二相色镜位于发光光源上方，所述电路板、二相色镜、聚焦透镜、光纤探头排列在一条线上。For example, invention patent application CN 109632130B "An integrated fluorescence temperature measurement optical path module device" provides an integrated fluorescence temperature measurement optical path module device, including: a circuit board, which is provided with a signal processing circuit, and a surface-mounted photodiode is installed on the circuit board, and the photodiode and the signal processing circuit are electrically connected; an optical fiber probe; a spectrometer, the left side of which is connected to the circuit board, and the right side is connected to the optical fiber probe, a light source is installed at the bottom of the spectrometer, and a dichroic mirror and a focusing lens located on the right side of the dichroic mirror are provided on the spectrometer, and the dichroic mirror is located above the light source, and the circuit board, the dichroic mirror, the focusing lens, and the optical fiber probe are arranged in a line.
如发明专利申请CN 110057465A《用于荧光光纤温控系统的光学模块及光电解调模块》提供了一种用于荧光光纤温控系统的光学模块及光电解调模块，其中光学模块包括安装座以及设在安装座内的发光二极管、透镜、光纤接头、第一滤波片、第二滤波片；安装座的前表面开有贯通于后表面的三层台阶通孔，分别为直径依次减少的第一通孔、第二通孔及第三通孔；光纤接头的一端安装在第一通孔内，透镜的一端安装在第二通孔内，发光二极管安装在第三通孔内；安装座上表面开有贯通于下表面，且相连通的第一条形孔、第二条形孔、第四通孔；第一滤波片安装在第一条形孔内，第二滤波片安装在第二条形孔内；第四通孔用于安装PD；第二滤波片位于第一滤波片和PD之间。For example, invention patent application CN 110057465A "Optical module and photoelectric demodulation module for fluorescent fiber temperature control system" provides an optical module and photoelectric demodulation module for fluorescent fiber temperature control system, wherein the optical module includes a mounting seat and a light-emitting diode, a lens, a fiber connector, a first filter, and a second filter arranged in the mounting seat; the front surface of the mounting seat is provided with three-layer stepped through holes penetrating the rear surface, which are a first through hole, a second through hole, and a third through hole with successively decreasing diameters; one end of the fiber connector is installed in the first through hole, one end of the lens is installed in the second through hole, and the light-emitting diode is installed in the third through hole; the upper surface of the mounting seat is provided with a first strip hole, a second strip hole, and a fourth through hole penetrating the lower surface and connected to each other; the first filter is installed in the first strip hole, and the second filter is installed in the second strip hole; the fourth through hole is used to install PD; the second filter is located between the first filter and the PD.
发明内容Summary of the invention
本发明要解决的技术问题是针对上述现有技术的不足，提供一种荧光光纤测温光路耦合及光电解调模块，实现激励光源与光纤传感探头的光路耦合，荧光与光电探测器的光路耦合，电信号驱动及解调等功能。The technical problem to be solved by the present invention is to provide a fluorescent fiber optic temperature measurement optical path coupling and photoelectric demodulation module in view of the deficiencies of the above-mentioned prior art, so as to realize the optical path coupling between the excitation light source and the optical fiber sensor probe, the optical path coupling between the fluorescence and the photoelectric detector, the electrical signal driving and demodulation and other functions.
为解决上述技术问题，本发明所采取的技术方案是：一种荧光光纤测温光路耦合及光电解调模块，包括光路耦合结构组件、第一光纤接头、第二光纤接头、第一耦合透镜、第二耦合透镜、激励光源、光电探测器和光电解调电路板；所述激励光源位于第一耦合透镜焦点处；所述光电探测器位于第二耦合透镜焦点处；所述光路耦合结构组件设有四个通孔，第一耦合透镜、第二耦合透镜、激励光源以及光电探测器分别设置在四个通孔内；第一光纤接头和第二光纤接头分别与设置第一耦合透镜和第二耦合透镜的两个通孔连接；所述激励光源和光电探测器均与光电解调电路板电连接；所述第一光纤接头、第一耦合透镜和激励光源同轴直线依次对应设置，组成光源耦合光路；所述第二光纤接头、第二耦合透镜和光电探测器同轴直线依次对应设置，组成荧光耦合光路；所述光源耦合光路与荧光耦合光路独立设置；In order to solve the above technical problems, the technical solution adopted by the present invention is: a fluorescent fiber temperature measurement optical path coupling and photoelectric demodulation module, including an optical path coupling structure component, a first optical fiber connector, a second optical fiber connector, a first coupling lens, a second coupling lens, an excitation light source, a photodetector and a photoelectric demodulation circuit board; the excitation light source is located at the focus of the first coupling lens; the photodetector is located at the focus of the second coupling lens; the optical path coupling structure component is provided with four through holes, and the first coupling lens, the second coupling lens, the excitation light source and the photodetector are respectively arranged in the four through holes; the first optical fiber connector and the second optical fiber connector are respectively connected to the two through holes in which the first coupling lens and the second coupling lens are arranged; the excitation light source and the photodetector are both electrically connected to the photoelectric demodulation circuit board; the first optical fiber connector, the first coupling lens and the excitation light source are coaxially arranged in line and correspond to each other in sequence to form a light source coupling optical path; the second optical fiber connector, the second coupling lens and the photodetector are coaxially arranged in line and correspond to each other in sequence to form a fluorescence coupling optical path; the light source coupling optical path and the fluorescence coupling optical path are independently arranged;
优选地，所述第一光纤接头和第二光纤接头采用ST型或FC型光纤接头。Preferably, the first optical fiber connector and the second optical fiber connector are ST type or FC type optical fiber connectors.
优选地，所述光源耦合光路与荧光耦合光路沿水平方向或竖直方向平行设置。Preferably, the light source coupling optical path and the fluorescence coupling optical path are arranged in parallel along a horizontal direction or a vertical direction.
优选地，所述光路耦合结构组件设有四个通孔，分别为第一通孔、第二通孔、第三通孔、第四通孔；第一通孔和第三通孔同轴连通；第二通孔和第四通孔同轴连通；第一通孔和第二通孔平行设置，第三通孔和第四通孔平行设置；第一耦合透镜设置在第一通孔内，第一光纤接头与第一通孔连接；第二耦合透镜设置在第二通孔内，第二光纤接头与第二通孔连接；激励光源设置在第三通孔内，第三通孔孔径与激励光源外径相同；光电探测器设置在第四通孔内，第四通孔孔径与光电探测器外径相同。Preferably, the optical path coupling structure component is provided with four through holes, namely the first through hole, the second through hole, the third through hole, and the fourth through hole; the first through hole and the third through hole are coaxially connected; the second through hole and the fourth through hole are coaxially connected; the first through hole and the second through hole are arranged in parallel, and the third through hole and the fourth through hole are arranged in parallel; the first coupling lens is arranged in the first through hole, and the first optical fiber connector is connected to the first through hole; the second coupling lens is arranged in the second through hole, and the second optical fiber connector is connected to the second through hole; the excitation light source is arranged in the third through hole, and the aperture of the third through hole is the same as the outer diameter of the excitation light source; the photodetector is arranged in the fourth through hole, and the aperture of the fourth through hole is the same as the outer diameter of the photodetector.
优选地，所述第一耦合透镜为双凸透镜或平凸透镜，当第一耦合透镜为平凸透镜时，激励光源位于凸透镜凸面侧，第一光纤接头位于凸透镜平面侧；Preferably, the first coupling lens is a biconvex lens or a plano-convex lens. When the first coupling lens is a plano-convex lens, the excitation light source is located on the convex surface side of the convex lens, and the first optical fiber connector is located on the plane side of the convex lens.
所述第二耦合透镜为双凸透镜或平凸透镜，当第二耦合透镜为平凸透镜时，光电探测器位于凸透镜凸面侧，第二光纤接头位于凸透镜平面侧。The second coupling lens is a double convex lens or a plano-convex lens. When the second coupling lens is a plano-convex lens, the photodetector is located on the convex surface side of the convex lens, and the second optical fiber connector is located on the plane side of the convex lens.
优选地，所述第一光纤接头和第一耦合透镜间以及第二光纤接头和第二耦合透镜间均设置有柔性胶圈。Preferably, a flexible rubber ring is provided between the first optical fiber connector and the first coupling lens, and between the second optical fiber connector and the second coupling lens.
优选地，所述光电解调电路板上设有激励光源驱动电路、光电探测器采集电路、运算处理单元和电气接口；所述激励光源、光电探测器、激励光源驱动电路、光电探测器采集电路、运算处理单元、电气接口在光电解调电路板同侧；Preferably, the photoelectric demodulation circuit board is provided with an excitation light source driving circuit, a photoelectric detector acquisition circuit, an operation processing unit and an electrical interface; the excitation light source, the photoelectric detector, the excitation light source driving circuit, the photoelectric detector acquisition circuit, the operation processing unit and the electrical interface are on the same side of the photoelectric demodulation circuit board;
所述激励光源驱动电路包括可控恒流驱动电路和驱动周期控制电路；The excitation light source driving circuit includes a controllable constant current driving circuit and a driving cycle control circuit;
所述光电探测器采集电路包括电流电压转换电路和运算放大电路；The photoelectric detector acquisition circuit includes a current-voltage conversion circuit and an operational amplifier circuit;
所述运算处理单元采用单片机，运算处理单元与激励光源驱动电路、光电探测器采集电路分别连接；The arithmetic processing unit adopts a single chip microcomputer, and the arithmetic processing unit is connected to the excitation light source driving circuit and the photoelectric detector acquisition circuit respectively;
所述运算处理单元通过数模转换器，设定输出电压，控制可控恒流驱动电路电流，控制激励光源光强；The arithmetic processing unit sets the output voltage through a digital-to-analog converter, controls the current of the controllable constant current driving circuit, and controls the light intensity of the excitation light source;
所述运算处理单元通过产生光源驱动信号，控制激励光源驱动周期和占空比。The operation processing unit controls the driving period and duty cycle of the excitation light source by generating a light source driving signal.
优选地，所述光路耦合结构组件下表面设有定位安装孔，后表面设有凹槽和电路板固定孔；所述光电解调电路板设置在光路耦合结构组件后表面凹槽内，通过螺丝与电路板固定孔连接。Preferably, the optical path coupling structure component has a positioning and mounting hole on its lower surface, and a groove and a circuit board fixing hole on its rear surface; the photoelectric demodulation circuit board is arranged in the groove on the rear surface of the optical path coupling structure component, and is connected to the circuit board fixing hole by screws.
优选地，所述光电解调电路板的电气接口包括供电接口和通讯接口，采用UART或I2C方式通讯，采用直流5V或者3.3V电源供电。Preferably, the electrical interface of the photoelectric demodulation circuit board includes a power supply interface and a communication interface, uses UART or I2C communication, and is powered by a DC 5V or 3.3V power supply.
优选地，所述光路耦合结构组件采用航空铝合金材质，组件表面及各通孔均经黑色氧化处理。Preferably, the optical path coupling structure component is made of aviation aluminum alloy, and the component surface and each through hole are black oxidized.
采用上述技术方案所产生的有益效果在于：本发明提供的一种荧光光纤测温光路耦合及光电解调模块，结构简单，所含零部件少，无需半透半反滤光片，无额外安装调试开孔，简化了安装调试操作流程，安装和维护方便；独立的耦合路径，提高了激励光源和光纤传感探头之间的耦合效率，提高了光纤传感探头和光电探测器之间的耦合效率，避免了光信号之间的干扰，可以提高荧光光纤测温传感器光信号质量，提高荧光光纤测温传感器的一致性。The beneficial effects of adopting the above technical scheme are: a fluorescent fiber optic temperature measurement optical path coupling and photoelectric demodulation module provided by the present invention has a simple structure, contains fewer parts, does not require a semi-transparent and semi-reflective filter, and has no additional installation and debugging openings, which simplifies the installation and debugging operation process and is convenient for installation and maintenance; the independent coupling path improves the coupling efficiency between the excitation light source and the optical fiber sensing probe, improves the coupling efficiency between the optical fiber sensing probe and the photodetector, avoids interference between optical signals, can improve the optical signal quality of the fluorescent fiber optic temperature sensor, and improves the consistency of the fluorescent fiber optic temperature sensor.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1为本发明实施例提供的一种荧光光纤测温光路耦合及光电解调模块的结构示意图；FIG1 is a schematic structural diagram of a fluorescent optical fiber temperature measurement optical path coupling and photoelectric demodulation module provided by an embodiment of the present invention;
图2为本发明实施例提供的荧光光纤测温光路耦合及光电解调模块的剖视图；FIG2 is a cross-sectional view of a fluorescent optical fiber temperature measurement optical path coupling and photoelectric demodulation module provided in an embodiment of the present invention;
图3为本发明实施例提供的荧光光纤测温光路耦合及光电解调模块的底视图；FIG3 is a bottom view of a fluorescent optical fiber temperature measurement optical path coupling and photoelectric demodulation module provided in an embodiment of the present invention;
图4为本发明实施例提供的光路耦合结构组件的剖视图；FIG4 is a cross-sectional view of an optical path coupling structural component provided by an embodiment of the present invention;
图5为本发明实施例提供的光路耦合结构组件的后视图；FIG5 is a rear view of an optical path coupling structure assembly provided by an embodiment of the present invention;
图6为本发明实施例提供的光电解调电路板的结构框图；FIG6 is a block diagram of a photoelectric demodulation circuit board provided in an embodiment of the present invention;
图中：1、光路耦合结构组件；101、第一通孔、102、第二通孔、103、第三通孔、104、第四通孔、105、定位安装孔、106、电路板固定孔、107、凹槽；2、第一光纤接头；3、第二光纤接头；4、第一耦合透镜；5、第二耦合透镜；6、激励光源；7、光电探测器；8、光电解调电路板。In the figure: 1. optical path coupling structure component; 101. first through hole; 102. second through hole; 103. third through hole; 104. fourth through hole; 105. positioning and mounting hole; 106. circuit board fixing hole; 107. groove; 2. first optical fiber connector; 3. second optical fiber connector; 4. first coupling lens; 5. second coupling lens; 6. excitation light source; 7. photodetector; 8. photoelectric demodulation circuit board.
具体实施方式Detailed ways
下面结合附图和实施例，对本发明的具体实施方式作进一步详细描述。以下实施例用于说明本发明，但不用来限制本发明的范围。The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
本实施例中，一种荧光光纤测温光路耦合及光电解调模块，如图1-3所示，包括光路耦合结构组件1、第一光纤接头2、第二光纤接头3、第一耦合透镜4、第二耦合透镜5、激励光源6、光电探测器7和光电解调电路板8；所述激励光源6位于第一耦合透镜4焦点处；所述光电探测器7位于第二耦合透镜5焦点处；所述光路耦合结构组件设有四个通孔，第一耦合透镜4、第二耦合透镜5、激励光源6以及光电探测器7分别设置在四个通孔内；第一光纤接头2和第二光纤接头3分别与设置第一耦合透镜4和第二耦合透镜5的两个通孔连接；所述激励光源6和光电探测器7均与光电解调电路板8电连接；所述第一光纤接头2、第一耦合透镜4和激励光源6同轴直线依次对应设置，组成光源耦合光路；所述第二光纤接头3、第二耦合透镜5和光电探测器7同轴直线依次对应设置，组成荧光耦合光路；所述光源耦合光路与荧光耦合光路独立设置；In this embodiment, a fluorescent fiber temperature measurement optical path coupling and photoelectric demodulation module, as shown in Figures 1-3, includes an optical path coupling structural component 1, a first optical fiber connector 2, a second optical fiber connector 3, a first coupling lens 4, a second coupling lens 5, an excitation light source 6, a photodetector 7 and a photoelectric demodulation circuit board 8; the excitation light source 6 is located at the focus of the first coupling lens 4; the photodetector 7 is located at the focus of the second coupling lens 5; the optical path coupling structural component is provided with four through holes, and the first coupling lens 4, the second coupling lens 5, the excitation light source 6 and the photodetector 7 are respectively arranged in the four through holes; the first optical fiber connector 2 and the second optical fiber connector 3 are respectively connected to the two through holes in which the first coupling lens 4 and the second coupling lens 5 are arranged; the excitation light source 6 and the photodetector 7 are both electrically connected to the photoelectric demodulation circuit board 8; the first optical fiber connector 2, the first coupling lens 4 and the excitation light source 6 are coaxially arranged in line and correspond to each other in sequence to form a light source coupling optical path; the second optical fiber connector 3, the second coupling lens 5 and the photodetector 7 are coaxially arranged in line and correspond to each other in sequence to form a fluorescence coupling optical path; the light source coupling optical path and the fluorescence coupling optical path are independently arranged;
所述第一光纤接头2和第二光纤接头3采用ST型或FC型光纤接头。The first optical fiber connector 2 and the second optical fiber connector 3 are ST type or FC type optical fiber connectors.
所述光源耦合光路与荧光耦合光路沿水平方向或竖直方向平行设置。The light source coupling optical path and the fluorescence coupling optical path are arranged in parallel along a horizontal direction or a vertical direction.
本实施例中，所述光路耦合结构组件如图4、5所示，设有四个通孔，分别为第一通孔101、第二通孔102、第三通孔103和第四通孔104；第一通孔101和第三通孔103同轴连通；第二通孔102和第四通孔104同轴连通；第一通孔101和第二通孔102平行设置，第三通孔103和第四通孔104平行设置；第一耦合透镜4设置在第一通孔101内，第一光纤接头2与第一通孔101连接；第二耦合透镜5设置在第二通孔102内，第二光纤接头3与第二通孔102连接；激励光源6设置在第三通孔103内，第三通孔103孔径与激励光源6外径相同；光电探测器7设置在第四通孔104内，第四通孔104孔径与光电探测器7外径相同。In this embodiment, the optical path coupling structure component is shown in Figures 4 and 5, and is provided with four through holes, namely the first through hole 101, the second through hole 102, the third through hole 103 and the fourth through hole 104; the first through hole 101 and the third through hole 103 are coaxially connected; the second through hole 102 and the fourth through hole 104 are coaxially connected; the first through hole 101 and the second through hole 102 are arranged in parallel, and the third through hole 103 and the fourth through hole 104 are arranged in parallel; the first coupling lens 4 is arranged in the first through hole 101, and the first optical fiber connector 2 is connected to the first through hole 101; the second coupling lens 5 is arranged in the second through hole 102, and the second optical fiber connector 3 is connected to the second through hole 102; the excitation light source 6 is arranged in the third through hole 103, and the aperture of the third through hole 103 is the same as the outer diameter of the excitation light source 6; the photodetector 7 is arranged in the fourth through hole 104, and the aperture of the fourth through hole 104 is the same as the outer diameter of the photodetector 7.
所述第一耦合透镜4为双凸透镜或平凸透镜，当第一耦合透镜4为平凸透镜时，激励光源6位于凸透镜凸面侧，第一光纤接头2位于凸透镜平面侧。The first coupling lens 4 is a biconvex lens or a plano-convex lens. When the first coupling lens 4 is a plano-convex lens, the excitation light source 6 is located on the convex surface side of the convex lens, and the first optical fiber connector 2 is located on the plane side of the convex lens.
第二耦合透镜5为双凸透镜或平凸透镜，当第二耦合透镜5为平凸透镜时，光电探测器7位于凸透镜凸面侧，第二光纤接头3位于凸透镜平面侧。The second coupling lens 5 is a biconvex lens or a plano-convex lens. When the second coupling lens 5 is a plano-convex lens, the photodetector 7 is located on the convex surface side of the convex lens, and the second optical fiber connector 3 is located on the plane side of the convex lens.
所述第一光纤接头2和第一耦合透镜4间以及第二光纤接头3和第二耦合透镜5间均设置有柔性胶圈。Flexible rubber rings are provided between the first optical fiber connector 2 and the first coupling lens 4 and between the second optical fiber connector 3 and the second coupling lens 5 .
所述光电解调电路板8如图6所示，电路板上设有激励光源驱动电路、光电探测器采集电路、运算处理单元和电气接口；所述激励光源6、光电探测器7、激励光源驱动电路、光电探测器采集电路、运算处理单元、电气接口在光电解调电路板同侧；The photoelectric demodulation circuit board 8 is shown in FIG6 , and an excitation light source driving circuit, a photodetector acquisition circuit, an operation processing unit and an electrical interface are provided on the circuit board; the excitation light source 6, the photodetector 7, the excitation light source driving circuit, the photodetector acquisition circuit, the operation processing unit and the electrical interface are on the same side of the photoelectric demodulation circuit board;
所述激励光源驱动电路包括可控恒流驱动电路和驱动周期控制电路；The excitation light source driving circuit includes a controllable constant current driving circuit and a driving cycle control circuit;
所述光电探测器采集电路包括电流电压转换电路和运算放大电路；The photoelectric detector acquisition circuit includes a current-voltage conversion circuit and an operational amplifier circuit;
所述运算处理单元采用单片机，运算处理单元与激励光源驱动电路、光电探测器采集电路分别连接；The arithmetic processing unit adopts a single chip microcomputer, and the arithmetic processing unit is connected to the excitation light source driving circuit and the photoelectric detector acquisition circuit respectively;
所述运算处理单元通过数模转换器，设定输出电压，控制可控恒流驱动电路电流，控制激励光源光强；The arithmetic processing unit sets the output voltage through a digital-to-analog converter, controls the current of the controllable constant current driving circuit, and controls the light intensity of the excitation light source;
所述运算处理单元通过产生光源驱动信号，控制激励光源驱动周期和占空比；The operation processing unit controls the driving period and duty cycle of the excitation light source by generating a light source driving signal;
所述光路耦合结构组件1下表面设有定位安装孔105，后表面设有凹槽107和电路板固定孔106；所述光电解调电路板8设置在光路耦合结构组件1后表面凹槽107内，通过螺丝与电路板固定孔106连接。The optical path coupling structure component 1 has a positioning and mounting hole 105 on its lower surface, and a groove 107 and a circuit board fixing hole 106 on its rear surface; the photoelectric demodulation circuit board 8 is arranged in the groove 107 on the rear surface of the optical path coupling structure component 1, and is connected to the circuit board fixing hole 106 by screws.
所述光电解调电路板8的电气接口包括供电接口和通讯接口，采用UART或I2C方式通讯，采用直流5V或者3.3V电源供电。The electrical interface of the photoelectric demodulation circuit board 8 includes a power supply interface and a communication interface, which communicates in UART or I2C mode and is powered by a DC 5V or 3.3V power supply.
所述光路耦合结构组件1采用航空铝合金材质，组件表面及各通孔均经黑色氧化处理。The optical path coupling structure component 1 is made of aviation aluminum alloy, and the component surface and each through hole are black oxidized.
本实施例中，激励光源6为LED光源，中心波长420nm。In this embodiment, the excitation light source 6 is an LED light source with a central wavelength of 420 nm.
最后应说明的是：以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明权利要求所限定的范围。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope defined by the claims of the present invention.
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