CN113074886B - Detection method based on fiber bragg grating watertight door sealing state - Google Patents
Detection method based on fiber bragg grating watertight door sealing state Download PDFInfo
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- CN113074886B CN113074886B CN202110461696.8A CN202110461696A CN113074886B CN 113074886 B CN113074886 B CN 113074886B CN 202110461696 A CN202110461696 A CN 202110461696A CN 113074886 B CN113074886 B CN 113074886B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/36—Investigating fluid-tightness of structures by using fluid or vacuum by detecting change in dimensions of the structure being tested
- G01M3/363—Investigating fluid-tightness of structures by using fluid or vacuum by detecting change in dimensions of the structure being tested the structure being removably mounted in a test cell
Abstract
The invention discloses a detection method based on the sealing state of a watertight door with fiber bragg gratings, which is characterized in that a plurality of fiber bragg grating strain gauges for detection are arranged on the watertight door, the plurality of fiber bragg grating strain gauges for detection are fixedly arranged on the bottom surface of a sealing groove of the watertight door, temperature compensation fiber bragg grating strain gauges are fixedly arranged on a door plate of the watertight door to eliminate temperature influence, the wavelength difference value of the fiber bragg gratings when the watertight door is closed and opened is monitored in real time, a strain difference value curve of the watertight door is obtained, and the sealing state of the watertight door can be accurately judged by a threshold judgment method and a fiber bragg grating strain difference value curve database. The detection method based on the optical fiber sensing technology is adopted, so that the detection precision and stability are greatly improved, the accuracy of the detection of the sealing state of the watertight door is improved by adopting a multi-point installation method of a plurality of fiber grating strain gauges, and when the watertight door is in an abnormal sealing state, the reason of abnormal sealing can be judged, the abnormal sealing position can be accurately positioned, and the reliability of the detection method is improved.
Description
Technical Field
The invention belongs to the technical field of watertight door sealing state detection in the field of ships, and particularly relates to a detection method based on a watertight door sealing state of a fiber bragg grating.
Background
The watertight door is an important structure for ensuring safe running of the ship, and is of great importance for ensuring the watertightness of the cabin and further ensuring the safety of the cabin and even the ship. Therefore, the sealing detection of the watertight door of the ship is particularly important.
The sealing detection system is an important ship signal device, and can detect the sealing information of the watertight door by using a sensor and obtain the sealing state of the watertight door after the watertight door is closed. Most of the existing watertight door sealing detection systems adopt an ultrasonic detection method, and the basic principle is that an ultrasonic transmitter is placed on one side of a watertight door, a receiving device is placed on the other side of the watertight door, and after the watertight door is closed and locked, the receiving device is used for receiving and monitoring ultrasonic signals which may be transmitted from the transmitter. The ultrasonic transmitter transmits an ultrasonic signal, and if the receiving device does not have any sound wave signal which can be intercepted and received, the watertight door is in a sealed state. Otherwise, the water door is in an unsealed state, and the inspector can judge the size of the leakage hole according to the strength of the ultrasonic signal transmitted from the position of the leakage hole. The ultrasonic detection system is simple to operate, and an inspector or an operator can know the leakage point of the watertight door or the leakage point which is about to form. However, the ultrasonic sealing detection system has poor anti-interference capability, complex detection signal analysis and processing, and poor corrosion resistance and chemical stability in the ship industry with high humidity and complex cabin conditions, and only a portable ultrasonic leak detector is available in the market at present, which can only perform sealing detection on a watertight door within a specified time, and cannot achieve the purpose of monitoring the directness and the real-time performance of the watertight door. Therefore, detection misjudgment or misjudgment is easily caused, and the operation safety of the ship is threatened.
The fiber grating sensing technology has the characteristics of electric insulation, electromagnetic interference resistance, corrosion resistance, strong stability, small volume, light weight and the like, and is widely applied to various complex environments with electromagnetic interference. In order to solve the problem of the existing watertight door detection system in application, the fiber bragg grating sensing technology is introduced into the watertight door sealing detection application in the ship industry. The watertight door sealing state detection method developed based on the fiber bragg grating does not need to consider electromagnetic equipment in a cabin, can monitor the watertight door sealing state directly and in real time, can avoid the problems in the ultrasonic detection system, and enables the application scene of the detection method to be wider.
Disclosure of Invention
The invention aims to solve the problems that the existing watertight door sealing detection system has poor anti-jamming capability, poor corrosion resistance and chemical stability and cannot achieve the monitoring purposes of the directness and the real-time performance of the watertight door; the problem that detection misjudgment or misjudgment is easily caused and the operation safety of the ship is threatened.
The invention provides the following technical scheme: a detection method based on the sealing state of a watertight door of a fiber bragg grating is characterized in that a plurality of fiber bragg grating strain gauges are arranged on the watertight door, and each fiber bragg grating strain gauge comprises a fiber bragg grating strain gauge for detection and a temperature compensation fiber bragg grating strain gauge; the bottom surface of a sealing groove of the watertight door is provided with a plurality of fiber bragg grating strain gauges for detection, a door plate of the watertight door is provided with a plurality of temperature compensation fiber bragg grating strain gauges, a body of each temperature compensation fiber bragg grating strain gauge is not pressed and is in the same temperature field with the corresponding fiber bragg grating strain gauge for detection, the body of each fiber bragg grating strain gauge for detection is pressed and deformed to send a signal when the watertight door is closed, and the temperature compensation fiber bragg grating strain gauges eliminate temperature influence; the plurality of fiber bragg grating strain gauges are connected with a demodulation instrument through a transmission optical cable, the wavelength of the fiber bragg grating in the fiber bragg grating strain gauges is detected in real time through the demodulation instrument and computer demodulation software, and the sealing state of the watertight door is judged.
Furthermore, at least one of the fiber bragg grating strain gauges for detection is positioned right below the wedge-shaped locking point of the watertight door.
Furthermore, the fiber grating strain gauge is formed by solidifying an elastic substrate and a fiber grating, the fiber grating is pre-stretched before solidification, and the elastic substrate is of a stainless steel arch structure.
Further, before the fiber bragg grating strain gauge is fixedly installed, polishing is carried out on an area, in contact with the strain gauge, of the watertight door; a through hole communicated with the sealing groove is drilled outside the door plate of the watertight door and is used for transmitting an optical cable; the vault of the elastic substrate on the fiber grating strain gauge for detection faces upwards, one end of the elastic substrate is connected with the bottom surface of the sealing groove, and the other end of the elastic substrate is in a free state.
Furthermore, a plurality of fiber grating strain gauges adopt a wavelength division multiplexing networking mode, the fiber grating strain gauges are connected in series and welded to one channel of the demodulation instrument, the transmission optical cable penetrates through a through hole of a door plate of the watertight door to enter the sealing groove and is welded with the fiber grating at one end, the tail fiber coil of the fiber grating at the other end is coiled in the sealing groove, and the optical fibers among the fiber grating strain gauges for detection are fixed by glue.
Further, the specific steps of judging the opening and closing state of the watertight door through the wavelength of the fiber bragg grating are as follows: detecting the wavelengths of a plurality of fiber bragg gratings in real time, and when the watertight door is in an open state, obtaining a door opening strain curve by judging the difference value between the wavelength of the fiber bragg grating for detection and the wavelength of the temperature compensation fiber bragg grating; when the watertight door is closed, obtaining a door closing strain curve by judging the difference value between the wavelength of the fiber bragg grating for detection and the wavelength of the temperature compensation fiber bragg grating, and calculating the difference value between the door closing strain curve and the door opening strain curve to obtain a watertight door strain difference value curve; judging the opening and closing state of the watertight door by using a fiber bragg grating strain gauge for detection which is arranged right below a wedge-shaped locking point of the door panel through a threshold value method, wherein the threshold value is represented by th1, and according to real-time detection data, if the real-time strain value obtained by the fiber bragg grating strain gauge for detection right below the locking point is less than th1, the watertight door is in an opening state; if the real-time strain value is greater than th1, the watertight door is in a closed state.
Further, the method for judging whether the watertight door is abnormal when closed comprises the following steps: establishing a database, and judging various abnormal states of the watertight door by adopting a database establishing method for a fiber bragg grating strain gauge for detection which is arranged right below a non-wedge-shaped locking point of a sealing groove, wherein the database is a strain difference curve database of the fiber bragg grating strain gauge for detection right below the non-wedge-shaped locking point of the sealing groove when the watertight door body or sealing rubber is in a normal state; if the real-time strain difference curve is not matched with the strain difference curve corresponding to the database, judging that the watertight door is in an abnormal state, and triggering an alarm signal, wherein the matching means that the curve change rule and the curve amplitude of the strain difference curve are matched.
Further, the method for judging the reason of the abnormal watertight door comprises the following steps: if the change rules of all the fiber bragg grating strain difference curves are consistent with the database, but the strain difference curves have different amplitudes, and the amplitude difference among all the strain difference curves is within an expected interval, judging that the abnormal state of the watertight door is caused by the deformation of the watertight door body; if the change rule of a certain fiber bragg grating strain difference curve is not in accordance with the database and the amplitude of the strain difference curve exceeds an expected interval, judging that the abnormal state of the watertight door is caused by the fact that foreign matters exist between the rubber and the sealing groove or between the rubber and the door frame at the point.
Furthermore, a cover plate is covered outside the temperature compensation fiber grating strain gauge.
Compared with the prior art, the invention has the advantages that:
according to the detection method based on the sealing state of the fiber bragg grating watertight door, the fiber bragg grating strain gauge for detection is fixedly installed in the sealing groove of the watertight door, and the temperature compensation fiber bragg grating strain gauge is fixedly installed on the door plate of the watertight door, so that the structure is simple, and the installation is convenient. The fiber bragg grating is used as the sensor, so that the detection precision is greatly improved, the fiber bragg grating is free from electromagnetic interference and corrosion-resistant, and the fiber bragg grating can work stably for a long time in a complicated and severe environment of the ship industry. The sealing state of the watertight door can be accurately judged by a threshold judgment method and a fiber bragg grating strain difference value curve database when the watertight door is normally sealed, and the multi-point-position installation method of a plurality of fiber bragg grating strain gauges is adopted at other positions of the sealing groove, so that when the watertight door is in an abnormal sealing state, the abnormal sealing reason can be judged, the abnormal sealing position can be accurately positioned, the quick overhaul of the watertight door by an maintainer is facilitated, and the accuracy and the reliability of the detection device are improved.
Drawings
FIG. 1 is a schematic view of the installation of a fiber grating strain gauge according to the present invention.
FIG. 2 is a schematic structural diagram of a fiber grating strain gauge according to the present invention.
FIG. 3 is a diagram of a strain difference curve of the fiber grating according to the present invention.
In the figure: 1-fiber grating strain gauge for detection; 2-temperature compensation fiber grating strain gauge; 3-watertight door plate; 4-watertight door seal groove; 5-an elastic substrate; 6-fiber grating; 7-watertight door frame; 8-sealing rubber; 9-door panel wedge locking points; 10-a cover plate; 11-transmission cable through hole.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings. The drawings are only for the purpose of understanding the technical content of the invention and are not intended to represent the actual scale and the actual shape of the product, wherein like reference numerals indicate parts that are structurally or functionally the same but which are structurally similar.
In this context, "parallel," "perpendicular," and the like are not strictly mathematical and/or geometric limitations, but may also encompass tolerances as would be understood by one skilled in the art and which would allow for the manufacture or use of the product. In addition, "perpendicular" includes not only mutually perpendicular in which two objects are directly connected in space but also mutually perpendicular in which two objects are not connected in space.
As shown in fig. 1, 2, 3; the invention designs a detection method based on the sealing state of a watertight door of a fiber bragg grating, wherein the detection method is characterized in that a plurality of fiber bragg grating strain gauges are arranged on the watertight door, and each fiber bragg grating strain gauge comprises a fiber bragg grating strain gauge for detection and a temperature compensation fiber bragg grating strain gauge; the bottom surface of the sealing groove of the watertight door is provided with a plurality of fiber bragg grating strain gauges for detection, one or a plurality of temperature compensation fiber bragg grating strain gauges are arranged on a door plate of the watertight door, and a temperature compensation fiber bragg grating strain gauge body is not pressed and is in the same temperature field with the fiber bragg grating strain gauge for detection. When an operator closes the watertight door, the fiber bragg grating strain gauge for detection deforms, and the temperature compensation fiber bragg grating strain gauge is used for eliminating the temperature influence, so that the fiber bragg grating strain gauge senses the sealing state of the watertight door. The plurality of fiber bragg grating strain gauges are connected with the demodulation instrument through the transmission optical cable, the wavelengths of the plurality of fiber bragg gratings are detected in real time through the demodulation instrument and computer demodulation software, and the sealing state of the watertight door is judged.
The sealing state of the watertight door comprises an opening and closing state of the watertight door and a normal state and an abnormal state of the watertight door after the watertight door is closed. At least one of the fiber bragg grating strain gauges for detection is located right below the wedge-shaped locking point of the watertight door, and the rest of the fiber bragg grating strain gauges for detection are regularly or irregularly arranged at other positions of the sealing groove of the watertight door. The fiber bragg grating strain gauge installed right below the locking point is concentrated in stress and more obvious in deformation, and is used for detecting the opening and closing states of the watertight door. The fiber grating strain gauges arranged at other positions of the sealing groove are used for detecting abnormal sealing states caused by deformation of a watertight door body, existence of foreign matters between sealing rubber and the sealing groove or between the sealing rubber and a door frame and the like.
And after the temperature compensation fiber grating strain gauge is installed, the temperature compensation fiber grating strain gauge is packaged and protected by a cover plate to prevent the temperature compensation fiber grating strain gauge from being damaged in the operation process of the watertight door.
The fiber grating strain gauge is formed by solidifying an elastic substrate and a fiber grating. The fiber bragg grating is required to be pre-tensioned before being cured, so that the fiber bragg grating has certain pre-tensioning force, and the self-inspection of the detection device can be realized according to the pre-tensioning force, so that the fiber bragg grating strain gauge is ensured to be in a normal working state. The elastic substrate is of a stainless steel arch structure.
Before the fiber grating strain gauge is fixedly installed, the area in contact with the strain gauge on the watertight door needs to be polished, so that the fiber grating strain gauge can be in better contact, and the accuracy of a detection result is improved. Moreover, a through hole communicated with the sealing groove is drilled outside the door plate of the watertight door and is used for transmitting an optical cable; the connection of the transmission optical cable and the external demodulation equipment is facilitated. When the fiber bragg grating strain gauge is installed, the vault of the elastic substrate on the fiber bragg grating strain gauge for detection faces upwards, one end of the elastic substrate is connected with the bottom surface of the sealing groove, and the other end of the elastic substrate is in a free state; the connection mode is bonding, laser welding and the like.
All the fiber grating strain gauges in the watertight door are connected in series and welded by adopting a wavelength division multiplexing networking technology, and are connected to one channel of the demodulation instrument. And the transmission optical cable penetrates through the through hole of the watertight door panel to enter the sealing groove, is welded with the fiber bragg grating at one end, and is well arranged in the sealing groove by the tail fiber disc of the fiber bragg grating at the other end. Utilize glue to fix the optic fibre between the fiber grating foil gage for detection, prevent to make optic fibre snap in the impact of closing the door to optic fibre, increase detection device's shock resistance.
Detecting the wavelengths of the plurality of fiber bragg gratings in real time, and when the watertight door is in a completely opened state, obtaining a door opening strain curve by judging the difference value between the wavelength of the fiber bragg grating for detection and the wavelength of the temperature compensation fiber bragg grating; when the watertight door is closed, the door-closing strain curve is obtained by judging the difference value between the wavelength of the fiber grating for detection and the wavelength of the temperature compensation fiber grating. Because all the fiber gratings are in the same temperature field, the influence of the temperature on the detection is eliminated by a wavelength difference method. And calculating the difference value between the door closing strain curve and the full door opening strain curve to obtain a watertight door strain difference value curve, and judging the opening and closing state of the watertight door and the normal state and the abnormal state of the watertight door when the watertight door is closed according to a strain difference value detection algorithm.
The abnormal sealing state when the watertight door is closed mainly includes deformation of the watertight door body and existence of foreign matters between the sealing rubber and the sealing groove or between the sealing rubber and the door frame. The strain difference detection algorithm comprises a threshold judgment method and a database establishment method.
Judging the opening and closing state of the watertight door by using a fiber bragg grating strain gauge for detection which is arranged right below a wedge-shaped locking point of the door panel through a threshold value method, wherein the threshold value is represented by th1, and according to real-time detection data, if the real-time strain value obtained by the fiber bragg grating strain gauge for detection right below the locking point is less than th1, the watertight door is in an opening state; if the real-time strain value is greater than th1, the watertight door is in a closed state. Through a threshold judgment method and a strain difference detection algorithm, the accuracy and the stability of the watertight door opening and closing detection method are improved.
The method for judging whether the watertight door is closed is as follows: establishing a database, and judging various abnormal states of the watertight door by adopting a database establishing method for a fiber bragg grating strain gauge for detection which is arranged right below a non-wedge-shaped locking point of a sealing groove, wherein the database is a strain difference curve database of the fiber bragg grating strain gauge for detection which is arranged right below the non-wedge-shaped locking point of the sealing groove when a door body or sealing rubber of the watertight door is in a normal state, and judging that the door body or the sealing rubber is in the normal state if a real-time strain difference curve obtained by the fiber bragg grating strain gauge right below the non-wedge-shaped locking point of the sealing groove is matched with a strain difference curve corresponding to the database according to real-time detection data; if the real-time strain difference curve is not matched with the strain difference curve corresponding to the database, judging that the watertight door is in an abnormal sealing state, triggering an alarm signal, and informing maintenance personnel to overhaul the watertight door. The coincidence refers to coincidence of the curve change rule and the curve amplitude of the strain difference curve.
When an abnormal closed state occurs, the specific reason for the abnormality can be preliminarily judged. If the change rules of all the fiber bragg grating strain difference curves are consistent with the database, the strain difference curves have different amplitudes, and the difference of the amplitudes of all the strain difference curves is small, wherein the small difference of the amplitudes means that the difference of the amplitudes of all the strain difference curves is within an expected interval, and the expected interval is set according to the specific door body material of the watertight door and the thickness of the sealing strip. The abnormal closing state of the watertight door may be caused by the deformation of the watertight door body; if the change rule of a certain fiber grating strain difference curve is found to be inconsistent with the database, and the amplitude of the strain difference curve is suddenly increased and exceeds an expected interval, the abnormal closing state of the watertight door may be caused by the existence of foreign matters between the rubber and the sealing groove or between the rubber and the door frame at the point. By establishing a database method, the strain difference detection algorithm can accurately judge the abnormal closing state of the watertight door, preliminarily judge the specific abnormal reason and accurately position the abnormal position.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (5)
1. A detection method based on the sealing state of a fiber bragg grating watertight door is characterized by comprising the following steps: the watertight door is provided with a plurality of fiber bragg grating strain gauges, and each fiber bragg grating strain gauge comprises a fiber bragg grating strain gauge for detection and a temperature compensation fiber bragg grating strain gauge; the bottom surface of a sealing groove of the watertight door is provided with a plurality of fiber bragg grating strain gauges for detection, one or a plurality of temperature compensation fiber bragg grating strain gauges are arranged on a door plate of the watertight door, a body of each temperature compensation fiber bragg grating strain gauge is not pressed and is in the same temperature field with the corresponding fiber bragg grating strain gauge for detection, the body of each fiber bragg grating strain gauge for detection is pressed and deformed to send a signal when the watertight door is closed, and the temperature compensation fiber bragg grating strain gauges eliminate temperature influence; the plurality of fiber bragg grating strain gauges are connected with a demodulation instrument through a transmission optical cable, the wavelength of the fiber bragg grating in the fiber bragg grating strain gauges is detected in real time through the demodulation instrument and computer demodulation software, and the sealing state of the watertight door is judged;
at least one of the fiber bragg grating strain gauges for detection is positioned right below a wedge-shaped locking point of the watertight door; before the fiber bragg grating strain gauge is fixedly installed, polishing the area, in contact with the strain gauge, on the watertight door; a through hole communicated with the sealing groove is drilled outside the door plate of the watertight door and is used for transmitting an optical cable; the vault of the elastic substrate on the fiber bragg grating strain gauge for detection is upward, one end of the elastic substrate is connected with the bottom surface of the sealing groove, and the other end of the elastic substrate is in a free state;
the specific steps of judging the opening and closing states of the watertight door through the wavelength of the fiber bragg grating are as follows: detecting the wavelengths of a plurality of fiber bragg gratings in real time, and when the watertight door is in an open state, obtaining a door opening strain curve by judging the difference value between the wavelength of the fiber bragg grating for detection and the wavelength of the temperature compensation fiber bragg grating; when the watertight door is closed, obtaining a door closing strain curve by judging the difference value between the wavelength of the fiber bragg grating for detection and the wavelength of the temperature compensation fiber bragg grating, and calculating the difference value between the door closing strain curve and the door opening strain curve to obtain a watertight door strain difference value curve; judging the opening and closing state of the watertight door by using a fiber bragg grating strain gauge for detection which is arranged right below a wedge-shaped locking point of the door panel through a threshold value method, wherein the threshold value is represented by th1, and according to real-time detection data, if the real-time strain value obtained by the fiber bragg grating strain gauge for detection right below the locking point is less than th1, the watertight door is in an opening state; if the real-time strain value is greater than th1, the watertight door is in a closed state;
the method for judging whether the watertight door is closed is as follows: establishing a database, and judging various abnormal states of the watertight door by adopting a database establishing method for a fiber bragg grating strain gauge for detection which is arranged right below a non-wedge-shaped locking point of a sealing groove, wherein the database is a strain difference curve database of the fiber bragg grating strain gauge for detection which is arranged right below the non-wedge-shaped locking point of the sealing groove when a door body or sealing rubber of the watertight door is in a normal state, and judging that the door body or the sealing rubber is in the normal state if a real-time strain difference curve obtained by the fiber bragg grating strain gauge right below the non-wedge-shaped locking point of the sealing groove is matched with a strain difference curve corresponding to the database according to real-time detection data; if the real-time strain difference curve is not matched with the strain difference curve corresponding to the database, judging that the watertight door is in an abnormal state, and triggering an alarm signal, wherein the matching means that the curve change rule and the curve amplitude of the strain difference curve are matched;
the method for judging the reason of the abnormal watertight door comprises the following steps: if the change rules of all the fiber bragg grating strain difference value curves are in accordance with the database, but the strain difference value curves have different amplitudes, and the amplitude difference among all the strain difference value curves is in an expected interval, judging that the abnormal state of the watertight door is caused by the deformation of the watertight door body; if the change rule of one fiber bragg grating strain difference curve is not in accordance with the database and the amplitude of the strain difference curve exceeds an expected range, judging that the abnormal state of the watertight door is caused by the fact that foreign matters exist between the rubber and the sealing groove or between the rubber and the doorframe at the point.
2. The method for detecting the sealing state of the watertight door based on the fiber bragg grating as claimed in claim 1, wherein the method comprises the following steps: the fiber grating strain gauge is formed by solidifying an elastic substrate and a fiber grating, the fiber grating is pre-stretched before solidification, and the elastic substrate is of a stainless steel arch structure.
3. The method for detecting the sealing state of the watertight door based on the fiber bragg grating as claimed in claim 1, wherein the method comprises the following steps: before the fiber bragg grating strain gauge is fixedly installed, polishing the area, in contact with the strain gauge, on the watertight door; a through hole communicated with the sealing groove is drilled outside the door plate of the watertight door and is used for transmitting an optical cable; the vault of the elastic substrate on the fiber bragg grating strain gauge for detection is upward, one end of the elastic substrate is connected with the bottom surface of the sealing groove, and the other end of the elastic substrate is in a free state.
4. The detection method based on the fiber bragg grating watertight door sealing state according to claim 3, wherein the detection method comprises the following steps: the fiber grating strain gauges are connected in series and welded to one channel of the demodulation instrument, the transmission optical cable penetrates through the through hole of the watertight door panel to enter the sealing groove and is welded with the fiber grating at one end, the tail fiber of the fiber grating at the other end is coiled in the sealing groove, and the optical fiber between the fiber grating strain gauges for detection is fixed by glue.
5. The method for detecting the sealing state of the watertight door based on the fiber bragg grating as claimed in claim 1, wherein the method comprises the following steps: and a cover plate is covered outside the temperature compensation fiber grating strain gauge.
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| US6244099B1 (en) * | 1999-02-26 | 2001-06-12 | Corning Incorporated | Draw furnace sealing assembly and method |
| CN103983384A (en) * | 2013-02-08 | 2014-08-13 | 同方威视技术股份有限公司 | Fiber bragg grating tension sensor |
| CN106209223B (en) * | 2016-07-20 | 2018-06-29 | 大连海事大学 | A kind of all optical network Miter Lock Gates health status monitoring system and its method of work |
| CN106017572B (en) * | 2016-07-20 | 2018-09-21 | 大连海事大学 | A kind of sensor arrangement method of Miter Lock Gates health status on-line monitoring |
| CN106644449A (en) * | 2017-01-04 | 2017-05-10 | 大连海事大学 | Navigation lock miter gate bottom water stop water stop condition monitoring system and monitoring method thereof |
| CN107219125A (en) * | 2017-05-27 | 2017-09-29 | 福建省永正工程质量检测有限公司 | A kind of detection device for doors and windows sealing compressive property |
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