CN211205592U - Fiber bragg grating sensor for monitoring pressure of hull structure under action of wave load - Google Patents
Fiber bragg grating sensor for monitoring pressure of hull structure under action of wave load Download PDFInfo
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- CN211205592U CN211205592U CN202020197582.8U CN202020197582U CN211205592U CN 211205592 U CN211205592 U CN 211205592U CN 202020197582 U CN202020197582 U CN 202020197582U CN 211205592 U CN211205592 U CN 211205592U
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Abstract
The utility model relates to a fiber grating sensor for monitoring hull structure pressure under wave load effect, it mainly by sensor housing, the sealed lid of sensor, pressure conversion structure, the inside sensitization structure of sensor is constituteed. The flexible hinge of the internal sensitization structure is connected with the sensor shell through a fixing screw, and the fiber bragg grating is adhered between the fiber bragg grating adhering points of the two groups of beryllium bronze flexible hinge structures through epoxy resin glue. The fiber grating inside the sensor is connected with the transmission optical cable of the ship body through the watertight flange on the sealing cover of the sensor, and the wavelength change of the fiber grating is transmitted to the demodulator. The utility model discloses utilize aluminum alloy structure shell and sealed lid, guaranteed durability and the reliability that the fiber grating sensor that is used for hull structure pressure monitoring under the wave load effect was used in the marine field.
Description
Technical Field
The utility model belongs to the technical field of the fiber grating sensor, especially, relate to a fiber grating sensor that is used for hull structure pressure monitoring under wave load effect.
Background
The ship is used in the sea with severe environment for a long time and can be affected by different external environments, such as abnormal temperature change, ship body impact pressure, wave impact load, strong wind and huge wave impact and the like. These not only affect the normal navigation of the hull, but also are more likely to seriously damage the hull structure and the facilities on the ship. The pressure of the hull structure under the action of the wave load is one of important parameters monitored by a hull system, and if the pressure change of the hull structure can be monitored in time, the structural safety of the hull is certainly enhanced, and the overall reliability is improved.
The optical fiber grating is used as an important component of the optical fiber sensor, has the advantages of explosion prevention, corrosion resistance, electromagnetic interference resistance, electric insulation, electroless transmission and the like of the common optical fiber sensing technology, and has the characteristics of high use reliability, long service life, no influence of factors such as light source fluctuation, optical fiber bending loss, connection loss, detector aging and the like on the wavelength in the light beam transmission process, and a plurality of gratings with different wavelengths can be connected to one optical fiber in series, so that the monitoring sensitivity of the sensor is improved, long-term safety monitoring can be realized, and the optical fiber sensor is suitable for being used in severe environments such as marine ships.
Because of more uncertain factors in the marine environment, sensor equipment and other devices installed on a ship body must have higher working stability and real-time performance of monitoring data, and the traditional civil and commercial devices cannot meet the requirements. The utility model overcomes prior art is not enough, realizes being used for hull structure pressure monitoring under the wave load effect, and the data that will monitor provide the hull staff to make corresponding adjustment, avoid producing the harmful effects to the hull structure.
Disclosure of Invention
An object of the utility model is to overcome prior art's weak point, provide a fiber grating sensor who is used for hull structure pressure monitoring under the wave load effect in being applicable to marine environment to realize hull structure pressure dynamic monitoring under adverse circumstances.
The utility model discloses a realize above-mentioned purpose, adopt following technical scheme:
the utility model provides a fiber grating sensor that is used for hull structure pressure monitoring under wave load effect which characterized in that it mainly includes: the sensor comprises a sensor shell 4, a sensor sealing cover 9, a pressure conversion structure and a sensor internal sensitization structure;
the sensor shell 4 is a cylindrical shell which is formed by cutting, polishing and oxidizing aluminum alloy.
The sensor seal cover 9 all around be equipped with sealed recess 10 and sealed lid fixed orifices 7, inlay the sealed sealing strip that silica gel made and overlap in sealed recess 10, sensor seal cover 9 carries out fixed seal through fixed screw and sensor housing 4. The sensor sealing cover 9 is provided with a watertight flange mounting hole 12.
The pressure conversion structure mainly comprises a circular diaphragm 3 made of beryllium bronze and a force transmission column 2, wherein the circular diaphragm 3 and the force transmission column 2 are vertical. Circular diaphragm 3 top present the trapezoidal that falls, circular diaphragm 3 upper end is used for contacting the liquid that awaits measuring, lower extreme and sensor housing 4 upper end sealing connection.
The internal sensitization structure comprises an optical fiber connected with two gratings in series and a group of symmetrical beryllium bronze flexible hinge structures 1. The beryllium bronze flexible hinge structure 1 is connected with the sensor shell 4 through a fixing screw 5, and the fiber bragg grating is adhered and attached between the fiber bragg grating adhering points 6 of the two groups of beryllium bronze flexible hinge structures 1 through epoxy resin glue. The fiber grating inside the sensor is connected with the transmission optical cable of the ship body through the watertight flange 11 on the sealing cover 9 of the sensor, and the wavelength change of the fiber grating is transmitted to the demodulator.
A fiber grating sensor for ship structure pressure monitoring under wave load effect uses the influence of referring to grating method elimination temperature to ship structure pressure monitoring, ensures sensor measuring accuracy. The sensor shell 4 and the sensor sealing cover 9 are both formed by processing aluminum alloy through cutting, polishing and oxidizing steps without the process of splicing and welding.
The utility model further discloses a fiber grating sensor's application method for hull structure pressure monitoring under wave load effect, its characterized in that:
when the ship structure is subjected to the action of wave load caused by external environment change, the sensor arranged at the bow position of the ship body is directly contacted with the wave load, the wave load acts on the pressure conversion structure of the sensor, pressure difference is formed between the upper end and the lower end of the circular diaphragm 3, the circular diaphragm 3 drives the force transmission column 2 to move vertically and downwards under the action of pressure, two groups of flexible hinge structures 1 of the internal sensitization structure generate horizontal outward displacement under the action of the force transmission column 2, the fiber grating adhered between the two groups of flexible hinge structures 1 is stretched, the change of the center wavelength of the fiber grating basically presents a linear relation with the pressure change, and finally the relation between the center wavelength of the fiber grating and the pressure change of the ship body structure is obtained through a compensation algorithm.
The sensor shell 4 and the sensor sealing cover 9 are of aluminum alloy structures, so that the water tightness and stability of the system are improved. The use of watertight flange 11 can promote the anticorrosive performance of sensor, reduces the short circuit and opens the condition that takes place, improves the measurement accuracy of system, the later maintenance of being convenient for.
The utility model discloses a fiber grating sensor for hull structure pressure monitoring's under wave load effect application in the aspect of being used for hull structure pressure monitoring under adverse circumstances is further disclosed. The experimental result shows that the pressure change of the hull structure under the action of the wave load and the central wavelength change of the fiber bragg grating present a linear relation, which shows that the sensor has higher sensitivity. The simulation experiment shows that the fiber grating can reach 1712 mu under the pressure of 4.5 Mpa.
The utility model discloses more detailed description is as follows:
the internal sensitization structure comprises an optical fiber connected with two gratings in series and a group of symmetrical beryllium bronze flexible hinge structures 1. The beryllium bronze flexible hinge structure 1 is connected with the sensor shell 4 through a fixing screw 5, and the fiber bragg grating is adhered and attached between the fiber bragg grating adhering points 6 of the two groups of beryllium bronze flexible hinge structures 1 through epoxy resin glue. The fiber grating inside the sensor is connected with the transmission optical cable of the ship body through the watertight flange 11 on the sealing cover 9 of the sensor, and the wavelength change of the fiber grating is transmitted to the demodulator.
The periphery of the sensor sealing cover 9 is provided with a sealing groove 10 and a sealing cover fixing hole 7, a sealing rubber strip made of silica gel is embedded in the sealing groove 10, and the sensor sealing cover 9 is fixedly sealed with the sensor shell 4 through a fixing screw. The sensor sealing cover 9 is provided with a watertight flange mounting hole 12.
The utility model discloses mainly solved fiber grating sensor hull structure pressure monitoring under wave load effect in marine environment, the key sensitivity of having investigated fiber grating sensor, main difficult point lies in fiber grating sensor realization hull structure pressure monitoring's stability and water proofness.
The utility model discloses a fiber grating sensor and application for hull structure pressure monitoring under wave load effect compare positive effect that has with prior art and lie in:
(1) the fiber bragg grating sensor for monitoring the pressure of the hull structure under the action of the wave load aims at the requirements of the working environment of the hull, monitors the pressure of the hull structure under the action of the wave load in the marine environment, and has good water tightness and a large monitoring range.
(2) To abominable operating condition such as ocean humidity, surge, the utility model discloses utilize aluminum alloy structure shell and sealed lid, guaranteed durability and the reliability that the fiber grating sensor that is used for hull structure pressure monitoring under the wave load effect was used in the ocean field.
(3) The sensitivity of the sensor can be enhanced by using the symmetrical beryllium bronze flexible hinge structure, and the pressure monitoring range of the sensor is widened.
Drawings
FIG. 1 is a schematic structural diagram of a fiber grating sensor for monitoring pressure of a hull structure under the action of wave load;
FIG. 2 is a schematic structural view of a sealing cover of the sensor;
in the figure: the sensor comprises a flexible hinge structure 1, a force transmission column 2, a circular diaphragm 3, a sensor shell 4, a fixing screw 5, a fiber grating sticking point 6, a sealing cover fixing hole 7, a watertight flange 8, a sensor sealing cover 9, a sealing groove 10, a watertight flange 11 and a watertight flange mounting hole 12.
Detailed Description
The invention is described below by means of specific embodiments. Unless otherwise specified, the technical means used in the present invention are well known to those skilled in the art. Additionally, the embodiments should be considered illustrative, and not restrictive, of the scope of the invention, which is defined solely by the claims. It will be apparent to those skilled in the art that various changes and modifications can be made in these embodiments without departing from the spirit and scope of the invention. The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1
A fiber grating sensor for monitoring hull structure pressure under the action of wave load, it mainly includes its characterized in that: the sensor comprises a sensor shell 4, a sensor sealing cover 9, a pressure conversion structure and a sensor internal sensitization structure;
the sensor shell 4 is a cylindrical shell which is formed by cutting, polishing and oxidizing aluminum alloy.
The sensor seal cover 9 all around be equipped with sealed recess 10 and sealed lid fixed orifices 7, inlay the sealed sealing strip that silica gel made and overlap in sealed recess 10, sensor seal cover 9 carries out fixed seal through fixed screw and sensor housing 4. The sensor sealing cover 9 is provided with a watertight flange mounting hole 12.
The pressure conversion structure mainly comprises a circular diaphragm 3 made of beryllium bronze and a force transmission column 2, wherein the circular diaphragm 3 and the force transmission column 2 are vertical. Circular diaphragm 3 top present the trapezoidal that falls, circular diaphragm 3 upper end is used for contacting the liquid that awaits measuring, lower extreme and sensor housing 4 upper end sealing connection.
The internal sensitization structure comprises an optical fiber connected with two gratings in series and a group of symmetrical beryllium bronze flexible hinge structures 1. The beryllium bronze flexible hinge structure is connected with the sensor shell 4 through a fixing screw 5, and the fiber bragg grating is adhered and attached between the fiber bragg grating adhering points 6 of the two groups of beryllium bronze flexible hinge structures 1 through epoxy resin glue. The fiber grating inside the sensor is connected with the transmission optical cable of the ship body through the watertight flange 11 on the sealing cover 9 of the sensor, and the wavelength change of the fiber grating is transmitted to the demodulator.
Example 2
The using method comprises the following steps:
when the ship structure is subjected to the action of wave load caused by external environment change, the sensor arranged at the bow position of the ship body is directly contacted with the wave load, the wave load acts on the pressure conversion structure of the sensor, pressure difference is formed between the upper end and the lower end of the circular diaphragm 3, the circular diaphragm 3 drives the force transmission column 2 to move vertically and downwards under the action of pressure, two groups of flexible hinge structures 1 of the internal sensitization structure generate horizontal outward displacement under the action of the force transmission column 2, the fiber grating adhered between the two groups of flexible hinge structures 1 is stretched, the change of the center wavelength of the fiber grating basically presents a linear relation with the pressure change, and finally the relation between the center wavelength of the fiber grating and the pressure change of the ship body structure is obtained through a compensation algorithm.
The sensor shell 4 and the sensor sealing cover 9 are of aluminum alloy structures, so that the water tightness and stability of the system are improved. The use of watertight flange 11 can promote the anticorrosive performance of sensor, reduces the short circuit and opens the condition that takes place, improves the measurement accuracy of system, the later maintenance of being convenient for.
Example 3
The fiber grating sensor for monitoring the pressure of the hull structure under the action of the wave load and the conventional pressure sensor are applied to the same environment, and the fiber grating sensor for monitoring the pressure of the hull structure under the action of the wave load has a larger measurement range and higher measurement precision. The measurement accuracy of the fiber grating sensor for monitoring the pressure of the hull structure under the action of the wave load can reach 0.05% of the full range under the seawater pressure of 4.5Mpa, while the measurement accuracy of the traditional pressure sensor can only reach 0.5% of the full range.
Example 4
The reference grating method is used for eliminating the influence of temperature on the pressure monitoring of the ship structure, the temperature measurement is realized by using a grating which is not affected by strain, and the grating is connected in series with a sensitive structure in the sensor and is placed in the sensor. Once the sensor is packaged, the variation of the central wavelength of the fiber bragg grating is not influenced by temperature and is only related to the wavelength drift caused by the pressure variation of the hull structure under the action of the wave load, so that the fiber bragg grating sensor with the temperature self-compensation function is realized.
Claims (1)
1. The utility model provides a fiber grating sensor that is used for hull structure pressure monitoring under wave load effect which characterized in that it mainly includes: the sensor comprises a sensor shell, a sensor sealing cover, a pressure conversion structure and a sensor internal sensitization structure;
a sealing groove (10) sleeved with a sealing rubber strip and a sealing cover fixing hole (7) are formed in the periphery of the sensor sealing cover (9), the sensor sealing cover (9) is fixedly sealed with the sensor shell (4) through a fixing screw, and a watertight flange mounting hole (12) is formed in the sensor sealing cover (9);
the pressure conversion structure comprises a circular diaphragm (3) and a force transmission column (2) which are made of beryllium bronze, wherein the circular diaphragm (3) and the force transmission column (2) are vertical, an inverted trapezoid is arranged above the circular diaphragm (3), the upper end of the circular diaphragm (3) is in contact with liquid to be measured, and the lower end of the circular diaphragm is in sealing connection with the upper end of a sensor shell (4);
the internal sensitization structure comprises an optical fiber connected with two gratings in series and a group of symmetrical beryllium bronze flexible hinge structures (1); the beryllium bronze flexible hinge structure (1) is connected with the sensor shell (4) through a fixing screw (5), the fiber bragg grating is adhered between fiber bragg grating adhering points (6) of the two groups of beryllium bronze flexible hinge structures (1) through epoxy resin glue, and the fiber bragg grating inside the sensor is connected with a transmission optical cable of the ship body through a watertight flange (11) on a sensor sealing cover (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020197582.8U CN211205592U (en) | 2020-02-24 | 2020-02-24 | Fiber bragg grating sensor for monitoring pressure of hull structure under action of wave load |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020197582.8U CN211205592U (en) | 2020-02-24 | 2020-02-24 | Fiber bragg grating sensor for monitoring pressure of hull structure under action of wave load |
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| CN211205592U true CN211205592U (en) | 2020-08-07 |
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| CN202020197582.8U Active CN211205592U (en) | 2020-02-24 | 2020-02-24 | Fiber bragg grating sensor for monitoring pressure of hull structure under action of wave load |
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