CN113532706A - Optical fiber sensor for detecting optical cable light path - Google Patents
Optical fiber sensor for detecting optical cable light path Download PDFInfo
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- CN113532706A CN113532706A CN202110878054.8A CN202110878054A CN113532706A CN 113532706 A CN113532706 A CN 113532706A CN 202110878054 A CN202110878054 A CN 202110878054A CN 113532706 A CN113532706 A CN 113532706A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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Abstract
The invention discloses an optical fiber sensor for detecting an optical path of an optical cable, which comprises a shell, a reflection component and an output component, wherein the shell is provided with a light source; the reflection assembly is arranged in the shell and comprises an emission port, a reflection box adjacent to the emission port and a receiving end adjacent to the reflection box; the output assembly is arranged on the shell and comprises an SMA interface and an optical fiber interface; the optical fiber sensor for detecting the optical path of the optical cable detects the pressure in the optical cable, protects the joint, prevents the optical cable from being polluted and influencing the optical path, has compact structural design and small occupied space, is suitable for a use scene in a narrow space, adopts the Fabry-Perot interference principle, reduces the difficulty of optical coupling when the optical interfaces are butted and improves the spectral sensitivity when in measurement compared with the traditional cable interface.
Description
Technical Field
The invention relates to the technical field of sensing detection, in particular to an optical fiber sensor for detecting an optical cable light path.
Background
An optical fiber sensor is a sensor that converts the state of an object to be measured into a measurable optical signal. The optical fiber sensor has the working principle that light beams incident from a light source are sent into a modulator through an optical fiber, the light beams interact with external measured parameters in the modulator, so that optical properties of the light, such as intensity, wavelength, frequency, phase, polarization state and the like, are changed to form modulated light signals, and the modulated light signals are sent into a photoelectric device through the optical fiber and then are demodulated to obtain the measured parameters. In the whole process, the light beam is guided in through the optical fiber, passes through the modulator and then is emitted, wherein the optical fiber firstly plays the role of transmitting the light beam and secondly plays the role of an optical modulator. The sensor has the characteristics of intrinsic safety, long-term stability, electromagnetic interference resistance, electric insulation, high corrosion resistance measurement precision, high response speed and capability of normally working in a wide temperature range from low temperature to high temperature. It can be used for sensing in various large-scale electromechanical, petrochemical, metallurgical, high-voltage, strong electromagnetic interference, strong corrosion, inflammable and explosive environments.
The optical cable light path is generally arranged at the bottom of the ground, pressure testing needs to be carried out on the optical cable light path after the optical cable light path is arranged, the optical cable light path is prevented from being extruded by large force to influence the line, and pressure change is converted into cavity length change of an F-P pressure sensitive cavity in the sensor by utilizing a Fabry-Perot interference principle. The F-P pressure sensitive cavity consists of two parallel planes with certain reflectivity, light beams are reflected for many times to form multi-beam interference, and the length of the F-P cavity is correspondingly changed under the action of pressure to modulate incident light. By demodulating the optical output signal containing pressure information, a pressure value can be obtained. Although the optical fiber sensor is suitable for various severe environments, the optical fiber sensor is used in an area exceeding a measurement range, and meanwhile, the protection of a welding point is also paid attention to during structural packaging, so that the bending at the welding point is avoided. Unlike electronic sensors, fiber optic pressure sensors have joints that are more susceptible to contamination, while optical cables avoid running in undersized diameters.
Therefore, the optical fiber sensor for detecting the optical path of the optical cable detects the pressure in the optical cable, protects the joint, prevents the joint from polluting and influencing the optical path, has compact structural design and small occupied space, and is suitable for use scenes in narrow spaces.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned problems of the conventional optical fiber sensor for detecting an optical path of an optical cable.
Therefore, the present invention is directed to an optical fiber sensor for detecting the optical path of an optical cable, which detects the pressure inside the optical cable and protects the splice from contamination affecting the optical path.
In order to solve the technical problems, the invention provides the following technical scheme: a fibre-optic sensor for sensing an optical path of a fibre-optic cable comprising a housing, a reflective component and an output component, wherein the housing; the reflection assembly is arranged in the shell and comprises an emission port, a reflection box adjacent to the emission port and a receiving end adjacent to the reflection box; and the output assembly is arranged on the shell and comprises an SMA interface and an optical fiber interface.
As a preferable aspect of the optical fiber sensor for detecting an optical path of an optical fiber cable according to the present invention, wherein: the casing is that the cuboid is sealed, and bottom parallel arrangement has the installation piece, the installation piece is rectangular form, and has seted up the perforation in its bottom, the casing left and right sides is fixed with the cover cushion.
As a preferable aspect of the optical fiber sensor for detecting an optical path of an optical fiber cable according to the present invention, wherein: the shell back plate is also symmetrically provided with a plurality of clamping sleeves, and the clamping sleeves penetrate through the shell and are fixedly connected with the reflection box.
As a preferable aspect of the optical fiber sensor for detecting an optical path of an optical fiber cable according to the present invention, wherein: the transmitting port is fixedly arranged at one end of the inner wall of the shell, the receiving end is arranged at one end, far away from the transmitting port, of the inner wall of the shell, and the reflection box is arranged between the transmitting port and the receiving end and is aligned with the transmitting port and the receiving end.
As a preferable aspect of the optical fiber sensor for detecting an optical path of an optical fiber cable according to the present invention, wherein: the transmitting port comprises a transmitting switching block and a transmitting fixing block fixedly connected with the transmitting switching block, a connector is arranged in the center of the transmitting fixing block, a transmitting spring is adjacently arranged on the connector, and a transmitting lens is arranged at the tail end of the connector.
As a preferable aspect of the optical fiber sensor for detecting an optical path of an optical fiber cable according to the present invention, wherein: the reflection box is in a cuboid tubular shape, two ends of the reflection box are provided with inclined plane windows, the inclined plane windows are opposite to the emission port and the receiving port, Fabry-Perot resonance is arranged inside the reflection box, and a plurality of fixing frames are arranged between the outer wall of the reflection box and the inner wall of the shell.
As a preferable aspect of the optical fiber sensor for detecting an optical path of an optical fiber cable according to the present invention, wherein: the receiving terminal including receive the switching piece, set up in receive the switching piece on receive the stiff end, set up in receive receiving spring and screw rod between the stiff end, set up in receive stiff end central standard mirror, standard mirror aligns with the reflection box.
As a preferable aspect of the optical fiber sensor for detecting an optical path of an optical fiber cable according to the present invention, wherein: the SMA interface comprises an SMA insulating seat and an SMA penetrating plate joint, the SMA insulating seat is arranged on the side wall of the shell, and the SMA penetrating plate joint is arranged in the center of the SMA insulating seat.
As a preferable aspect of the optical fiber sensor for detecting an optical path of an optical fiber cable according to the present invention, wherein: the optical fiber interface is arranged on the side wall of the shell, connected with the SMA interface and the receiving end port and used for collecting output information in the reflection box.
As a preferable aspect of the optical fiber sensor for detecting an optical path of an optical fiber cable according to the present invention, wherein: the reflection box converts the pressure change inside the optical cable into the cavity length change of an F-P pressure sensitive cavity inside the sensor by utilizing a Fabry-Perot interference principle; the F-P pressure sensitive cavity consists of two parallel planes with certain reflectivity, light beams are reflected for multiple times between the two parallel planes to form multi-beam interference, and the length of the F-P cavity is correspondingly changed under the action of pressure so that incident light is modulated; by demodulating the optical output signal containing pressure information, a pressure value can be obtained.
The invention has the beneficial effects that:
the optical fiber sensor for detecting the optical path of the optical cable detects the pressure in the optical cable, protects the joint, prevents the optical cable from being polluted and influencing the optical path, has compact structural design and small occupied space, is suitable for a use scene in a narrow space, adopts the Fabry-Perot interference principle, reduces the difficulty of optical coupling when the optical interfaces are butted and improves the spectral sensitivity when in measurement compared with the traditional cable interface.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein: fig. 1 is a schematic view of the overall structure of the optical fiber sensor for detecting the optical path of the optical cable according to the present invention.
Fig. 2 is a schematic view of the overall structure of the optical fiber sensor for detecting the optical path of the optical cable according to the present invention.
Fig. 3 is a rear view showing the overall construction of the optical fiber sensor for detecting an optical path of an optical cable according to the present invention.
Fig. 4 is a schematic diagram of the overall structure of the optical fiber sensor for detecting the optical path of the optical cable according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Furthermore, the present invention is described in detail with reference to the drawings, and in the detailed description of the embodiments of the present invention, the cross-sectional view illustrating the structure of the device is not enlarged partially according to the general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Example 1
Referring to fig. 1, for a first embodiment of the present invention, there is provided a fiber optic sensor for sensing an optical path of a fiber optic cable, the sensor including a housing 100, a reflection assembly 200, and an output assembly 300, wherein the housing 100; the reflection assembly 200 is arranged in the housing 100 and comprises an emission port 201, a reflection box 202 adjacent to the emission port 201 and a receiving end 203 adjacent to the reflection box 202; and an output assembly 300, disposed on the housing 100, including an SMA interface 301 and an optical fiber interface 302.
Wherein, shell 100 bears sensor internals, provides the output and inserts the interface, connects sensor function and the cable that is surveyed, and reflection module 200 provides the light reflection and obtains the pressure value in the light input signal according to sensitive chamber change, exports numerical value to output module 300, and output module 300 passes through the interface output with the pressure value that reachs. The transmitting port 201 is connected with a tested cable to receive light information emitted from the tested cable, the reflecting box 202 provides an F-P pressure sensitive cavity, the cavity length is changed according to the emitted optical fiber information to obtain a pressure value, the receiving end 203 is arranged corresponding to the reflecting box 202 to receive light emitted from the reflecting box 202, and the SMA interface 301 and the optical fiber interface 302 output the pressure value information to external equipment.
Example 2
Referring to fig. 2 to 4, a second embodiment of the present invention is different from the first embodiment in that: the casing is that the cuboid is sealed, and bottom parallel arrangement has the installation piece, the installation piece is rectangular form, and has seted up the perforation in its bottom, the casing left and right sides is fixed with the cover cushion. The shell back plate is also symmetrically provided with a plurality of clamping sleeves, and the clamping sleeves penetrate through the shell and are fixedly connected with the reflection box.
The transmitting port is fixedly arranged at one end of the inner wall of the shell, the receiving end is arranged at one end, far away from the transmitting port, of the inner wall of the shell, and the reflection box is arranged between the transmitting port and the receiving end and is aligned with the transmitting port and the receiving end. The transmitting port comprises a transmitting switching block and a transmitting fixing block fixedly connected with the transmitting switching block, a connector is arranged in the center of the transmitting fixing block, a transmitting spring is adjacently arranged on the connector, and a transmitting lens is arranged at the tail end of the connector.
The reflection box is in a cuboid tubular shape, two ends of the reflection box are provided with inclined plane windows, the inclined plane windows are opposite to the emission port and the receiving port, Fabry-Perot resonance is arranged inside the reflection box, and a plurality of fixing frames are arranged between the outer wall of the reflection box and the inner wall of the shell. The receiving terminal including receive the switching piece, set up in receive the switching piece on receive the stiff end, set up in receive receiving spring and screw rod between the stiff end, set up in receive stiff end central standard mirror, standard mirror aligns with the reflection box.
The SMA interface comprises an SMA insulating seat and an SMA penetrating plate joint, the SMA insulating seat is arranged on the side wall of the shell, and the SMA penetrating plate joint is arranged in the center of the SMA insulating seat. The optical fiber interface is arranged on the side wall of the shell, connected with the SMA interface and the receiving end port and used for collecting output information in the reflection box.
The reflection box converts the pressure change inside the optical cable into the cavity length change of an F-P pressure sensitive cavity inside the sensor by utilizing a Fabry-Perot interference principle; the F-P pressure sensitive cavity consists of two parallel planes with certain reflectivity, light beams are reflected for multiple times between the two parallel planes to form multi-beam interference, and the length of the F-P cavity is correspondingly changed under the action of pressure so that incident light is modulated; by demodulating the optical output signal containing pressure information, a pressure value can be obtained.
Compared with the embodiment 1, further, the bottom of the housing 100 is provided with the mounting block 101, the mounting block 101 can fix the sensor on a wall surface, diversified mounting conditions are provided, the mounting block is provided with the through hole 101a, so that the interface can be conveniently fixed or expanded, the left and right sides of the housing 100 are provided with the rubber cover pads 102 for sealing the sensor, the back plate of the housing 100 is provided with the ferrule 103, the ferrule 103 and the reflection box 202 are fixedly connected and can fix the reflection box 202, the ports of the emission port 201, the reflection box 202 and the receiving end 203 are positioned on the same straight line, the emission port 201 further comprises an emission transfer block 201a, the emission transfer block 201a raises the vertical height of the emission port 210 and correspondingly accesses the reflection box 202, the emission fixed block 201b is used for fixing the connection port 201c and the emission spring 201d, the end of the connection port 201c is further provided with the emission lens 201e, the emission spring 201d fixes the connection port 201c and the emission lens 201e, and the shock absorption is carried out on the optical cable, the optical path inclination is prevented, the optical cable to be measured is connected to the connecting port 201c, the optical fiber is emitted from the connecting port 201c and enters the reflection box 202 through the transmitting lens 201e, and the cable to be measured interface is arranged in the sensor to prevent the optical cable from being polluted and influencing the measurement precision.
The two ends of the reflection box 202 are provided with inclined plane windows 202a, the inclined plane windows 202a receive the emitted light and emit the light, a Fabry-Perot resonant cavity is arranged in the reflection box 202, a plurality of fixing frames 202b are further arranged around the reflection box 202 to prevent the light path from being blocked or the light from being aligned due to the displacement of the reflection box 202, and the reflection box 202 converts the pressure change in the optical cable into the cavity length change of an F-P pressure sensitive cavity in the sensor by utilizing the Fabry-Perot interference principle; the F-P pressure sensitive cavity consists of two parallel planes with certain reflectivity, light beams are reflected for multiple times between the two parallel planes to form multi-beam interference, and the length of the F-P cavity is correspondingly changed under the action of pressure so that incident light is modulated; by demodulating the optical output signal containing pressure information, a pressure value can be obtained. The characteristic that the optical spectrum reflected by the MEMS optical fiber F-P sensor is sensitive to pressure is utilized, the input light source excitation/output optical spectrum analysis and pressure conversion of the MEMS optical fiber F-P sensor are completed through each functional module in the optical fiber sensing analyzer, the pressure information of each monitoring point is given in a digital mode, and the corresponding pressure information is calculated according to the parameter C
Warming and invigoratingThen actually testing the pressure sensor
TestingMinus
Warming and invigoratingIs marked as
Pressure ofAnd then the pressure conversion is carried out,
Kppressure coefficient of pressure measurement (KPa/nm); the pressure unit can be Mpa, the conversion is uniform, and the least square fitting conversion is generally carried out.
In addition, since the optical fiber is not only a sensitive element but also an excellent low-loss transmission line, it is not necessary to consider the relative position between the measuring instrument and the object to be measured, and it is particularly suitable for a case where a sensor such as an electrical system is not suitable. Can be matched with optical fiber remote measuring technology to realize remote measurement and control. The method has the advantages of good impact and overload resistance, extremely low failure rate, follow-up maintenance-free performance and long-term accurate measurement. The device has more remarkable advantages in the application occasions with inconvenient installation and operation and difficult maintenance.
The receiving end 203 is provided with a receiving transfer block 203a, the vertical height of the receiving end 203a is increased by the receiving transfer block 203a, the receiving transfer block is aligned with the inclined window 202a in the reflection box 202, the receiving fixed end 203b fixes a receiving spring 203c, a screw rod 203d and a standard mirror 203e, the screw rod 203d is fixedly connected with the receiving fixed end 203b, the receiving spring 203c is arranged between the receiving fixed ends 203b and can absorb shock and prevent shaking, the standard mirror 203e is arranged in the center of the receiving end 203 and is aligned with the inclined window 202a in the reflection box 202, and pressure value light path information is received.
The SMA insulating seat 301a in the SMA interface 301 reduces electromagnetic influence, an SMA through plate connector 301b is provided, and the SMA interface 301 and the optical fiber interface 302 can be connected with external equipment to output measured pressure value information.
The rest of the structure is the same as that of embodiment 1.
In the using process, the detected optical path is only required to be connected with the connecting port 201c, and the optical path is connected into the reflection box 202 to perform optical fiber pressure value conversion, so that the obtained data is output to external equipment through the SMA interface 301 or the optical fiber interface 302.
It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A fiber optic sensor for sensing an optical path of a fiber optic cable, comprising: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
a housing (100);
a reflection assembly (200) disposed within the housing (100) and including an emission port (201), a reflection box (202) adjacent to the emission port (201), and a receiving end (203) adjacent to the reflection box (202); and the number of the first and second groups,
the output assembly (300) is arranged on the shell (100) and comprises an SMA interface (301) and an optical fiber interface (302).
2. The fiber optic sensor for sensing an optical path of a fiber optic cable according to claim 1, wherein: the casing (100) are the cuboid sealed, and bottom parallel arrangement has installation piece (101), installation piece (101) are rectangular form, and perforation (101 a) have been seted up to its bottom, casing (100) left and right sides is fixed with and covers cushion (102).
3. The optical fiber sensor for detecting an optical path of an optical fiber cable according to claim 1 or 2, wherein: a plurality of clamping sleeves (103) are symmetrically arranged on the back plate of the shell (100), and the clamping sleeves (103) penetrate through the shell (100) and are fixedly connected with the reflection box (202).
4. A fiber optic sensor for sensing an optical path of a fiber optic cable according to claim 3, wherein: the transmitting port (201) is fixedly arranged at one end of the inner wall of the shell (100), the receiving end (203) is arranged at one end, far away from the transmitting port (201), of the inner wall of the shell (100), and the reflection box (202) is arranged between the transmitting port (201) and the receiving end (203) and is aligned with the transmitting port (201) and the receiving end (203).
5. The fiber optic sensor for sensing an optical path of a fiber optic cable of claim 4, wherein: the transmitting port (201) comprises a transmitting switching block (201 a) and a transmitting fixing block (201 b) fixedly connected with the transmitting switching block (201 a), a connecting port (201 c) is arranged in the center of the transmitting fixing block (201 b), a transmitting spring (201 d) is adjacently arranged on the connecting port (201 c), and a transmitting lens (201 e) is arranged at the tail end of the connecting port.
6. The fiber optic sensor for sensing an optical path of a fiber optic cable according to claim 5, wherein: the reflection box (202) is in a cuboid tubular shape, two ends of the reflection box are provided with inclined plane windows (202 a), the inclined plane windows (202 a) are aligned with the emission port (201) and the receiving end (203), a Fabry-Perot resonant cavity is arranged inside the reflection box (202), and a plurality of fixing frames (202 b) are arranged between the outer wall of the reflection box (202) and the inner wall of the shell (100).
7. A fibre-optic sensor for detecting the optical path of a fibre-optic cable according to any one of claims 1, 2, 4, 5, 6, wherein: the receiving end (203) including receive switching piece (203 a), set up in receive stiff end (203 b) on receiving switching piece (203 a), set up in receive spring (203 c) and screw rod (203 d) between stiff end (203 b), set up in receive stiff end central standard mirror (203 e), standard mirror (203 e) aligns with reflection box (202).
8. The fiber optic sensor for sensing an optical path of a fiber optic cable of claim 7, wherein: the SMA interface (301) comprises an SMA insulating seat (301 a) and an SMA penetrating plate joint (301 b), the SMA insulating seat (301 a) is arranged on the side wall of the shell (100), and the SMA penetrating plate joint (301 b) is arranged in the center of the SMA insulating seat (301 a).
9. The fiber optic sensor for sensing an optical path of a fiber optic cable of claim 8, wherein: the optical fiber interface (302) is arranged on the side wall of the shell (100), and the optical fiber interface (302) is connected with ports of the SMA interface (301) and the receiving end (203) to collect output information in the reflection box (202).
10. The fiber optic sensor for sensing an optical path of a fiber optic cable of claim 6, wherein: the reflection box (202) converts the pressure change inside the optical cable into the cavity length change of an F-P pressure sensitive cavity inside the sensor by utilizing a Fabry-Perot interference principle; the F-P pressure sensitive cavity consists of two parallel planes with certain reflectivity, light beams are reflected for multiple times between the two parallel planes to form multi-beam interference, and the length of the F-P cavity is correspondingly changed under the action of pressure so that incident light is modulated; by demodulating the optical output signal containing pressure information, a pressure value can be obtained.
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| CN202110878054.8A CN113532706A (en) | 2021-08-02 | 2021-08-02 | Optical fiber sensor for detecting optical cable light path |
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| CN202110878054.8A CN113532706A (en) | 2021-08-02 | 2021-08-02 | Optical fiber sensor for detecting optical cable light path |
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| CN101034028A (en) * | 2007-02-09 | 2007-09-12 | 南京师范大学 | Fabry-Perotw fiber-optic pressure sensor and manufacture method therefor |
| CN103994851A (en) * | 2014-05-15 | 2014-08-20 | 香港理工大学深圳研究院 | Resonant type Fabry-Perot optical fiber sensor, manufacturing method and air pressure detecting method |
| CN104215368A (en) * | 2014-09-15 | 2014-12-17 | 江苏昂德光电科技有限公司 | F-P cavity optical fiber pressure sensing device and demodulation method thereof |
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| CN211013323U (en) * | 2020-01-03 | 2020-07-14 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Optical fiber type rock stress sensor |
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