CN209459808U - Optical fibre grating acceleration sensor for the measurement of stem slamming load - Google Patents
Optical fibre grating acceleration sensor for the measurement of stem slamming load Download PDFInfo
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- CN209459808U CN209459808U CN201920214085.1U CN201920214085U CN209459808U CN 209459808 U CN209459808 U CN 209459808U CN 201920214085 U CN201920214085 U CN 201920214085U CN 209459808 U CN209459808 U CN 209459808U
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Abstract
The utility model relates to a kind of optical fibre grating acceleration sensors for the measurement of stem slamming load, are mainly made of sensor outer housing, sensor outer housing lid, acceleration transducer Sensitive Apparatus, hinge arrangement etc..Two grating regions of prestretching fiber grating are respectively adhered between mass block and the top and bottom of pedestal using epobond epoxyn, by watertight flanged joint to transmission cable, the stem slamming load amount of Ship Structure is shown in the form of the wavelength change of fiber grating at (FBG) demodulator end.The utility model improves the watertightness and stability of system, can be used in severe use environment using aluminium alloy structure shell and casing cover is integrally formed.The sensor can dynamically measure stem slamming load amount, eliminate the influence of temperature on fiber grating, ensure that reliability and durability that sensor is applied in marine field.
Description
Technical field
The utility model belongs to Fiber Grating Sensors Technology field, is related to the survey of marine ship structure stem slamming load
Amount.More specifically a kind of optical fibre grating acceleration sensor for the measurement of stem slamming load.
Background technique
In high speed operation under disliking condition, ship can be moved substantially ship, and hull bottom can expose the surface, when it is back into water,
Fierce impact can be generated with wave slamming phenomenon occurs in regions such as stem bottom, stern and flares.Instantaneous, the bottom in slamming
Portion is followed hard on by huge impact force, the vertical acceleration meeting sudden change of hull and high-frequency vibration occurs.Strong slamming
It can cause a series of serious consequences, more ship damage reports prove that this fluid impact load of slamming is to lead to ship both at home and abroad
Under body Water Plane the main reason for partial structurtes failure, shipbreaking.Therefore in the Ship Design of high speed, slamming load conduct
Main Load, should be using intensity of the check Ship Structure under load effect as one of Ship Design safety standard.
Optical fibre grating acceleration sensor for the measurement of stem slamming load is that acceleration is arranged in Ship Structure to pass
Sensor realizes the automatic monitoring of Ship Structure stem slamming load amount, true and reliable data is provided for policymaker on ship, to protect
It demonstrate,proves hull and scientific basis is provided safely, improve security performance.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the utility model is to provide a kind of light for the measurement of stem slamming load
Fine grating acceleration transducer design, is had using the optical fibre grating acceleration sensor that the stem slamming load of this design measures
There are preferable frequency response and higher sensitivity, realizes the real-time monitoring of Ship Structure stem slamming load amount.
The utility model to achieve the goals above, adopts the following technical scheme that:
A kind of optical fibre grating acceleration sensor for the measurement of stem slamming load, it is characterised in that the sensor
System includes: sensor outer housing 3, sensor outer housing lid 7, acceleration transducer Sensitive Apparatus, hinge arrangement.
Wherein sensor outer housing 3 be by aluminium alloy by cutting, polishing, oxidation and etc. be process, without splicing
The side of the process of welding, sensor outer housing 3 is equipped with watertight flange 2.Sensor outer housing lid 7 is surrounded by sealed groove, and
The nested installation sealing strip in sealed groove, is equipped with threaded fixation hole 6 in sensor outer housing lid 7, by fixed screw and passes
Sensor shell 3 is sealed.
Acceleration transducer Sensitive Apparatus is by the pre- of two wavelength different the first grating 4 and the second grating 8 of connecting
The optical fiber 1 and temperature-compensating grating 10 for stretching 2mm are constituted.Two grating regions of fiber grating use epobond epoxyn point
It is not pasted between mass block 5 and the top and bottom of pedestal 9, transmission cable is connected to by watertight flange 2.
The hinge arrangement is differential symmetry hinge arrangement, it is made of a monolith beryllium-bronze, by linear incision and
Processing, is an overall model.Including pedestal 9, pedestal fixation hole 11, flexible hinge 12, mass block 5.Mass block 5 passes through
Flexible hinge 12 is connect with pedestal 9, and pedestal 9 is directly connected to sensor outer housing 3.
A kind of feature of optical fibre grating acceleration sensor for the measurement of stem slamming load described in the utility model
It is:
(1) optical fibre grating acceleration sensor for the measurement of stem slamming load is to be fixed on ship by sensor outer housing 3
On oceangoing ship, to measure the stem slamming load amount of hull.
(2) transducer body portions such as acceleration transducer Sensitive Apparatus and hinge arrangement are by sensor outer housing lid 7, sensing
The sealing device institute seal protection that device shell 3 forms, improves the watertightness and anti-destructive of sensing system, guarantees the optical fiber
The stable work of grating acceleration transducer.
The utility model further discloses a kind of optical fibre grating acceleration sensor for the measurement of stem slamming load
Application method, it is characterised in that:
(1) sensor being sealed is fixed on to the stem position of hull, the optical fiber of sensor internal passes through watertight flange 2
It draws, is connected to the transmission cable of hull, can finally observe the stem slamming load amount of Ship Structure in real time at (FBG) demodulator end.
(2) sensor improves the watertightness and stability of system using aluminium alloy structure and sealing cover is integrally formed.Water
The use of close flange 2 can promote the corrosion resistance of sensor, and reducing short interruption, there is a situation where improve the measurement of system
Precision is convenient for later maintenance.
The utility model more detailed description is as follows:
Acceleration transducer Sensitive Apparatus is by the pre- of two wavelength different the first grating 4 and the second grating 8 of connecting
The optical fiber 1 and temperature-compensating grating 10 for stretching 2mm are constituted.Two grating regions of fiber grating use epobond epoxyn point
It is not pasted between mass block 5 and the top and bottom of pedestal 9, transmission cable is connected to by watertight flange 2.The shape of fiber grating
Becoming with the wavelength change of fiber grating is substantially linear relationship, by the backoff algorithm at (FBG) demodulator end, obtains wavelength and ship
It is to change between the acceleration value of structure in ratio, the stem slamming load amount of final Ship Structure is with the wavelength of fiber grating
The form of variation is shown at (FBG) demodulator end.
Sensor outer housing lid 7 is surrounded by sealed groove, and the nested installation sealing strip in sealed groove, in sensor
Casing cover 7 is equipped with threaded fixation hole 6, is sealed by fixed screw and sensor outer housing 3.Improve the watertightness of system
And stability.
The utility model further discloses the optical fibre grating acceleration sensor for the measurement of stem slamming load
Application of the application method in terms of for stem slamming load amount automatically monitoring.Experimental result show the sensor frequency be 0-
Sensitivity within the scope of 100 Hz is 284 pm/g.
It is disclosed by the utility model to be used for the optical fibre grating acceleration sensor and apply and show that stem slamming load measures
There is technology to have the active effect that compared to possessed
(1) the optical fibre grating acceleration sensor design measured for the stem slamming load of Ship Structure, for hull
Operating environment requirements have good watertightness, preferable frequency response, higher sensitivity.
(2) for poor working conditions such as ocean humidity, surges, the utility model utilizes aluminium alloy structure shell and shell
Lid ensure that durability that the optical fibre grating acceleration sensor of stem slamming load measurement apply in marine field and reliably
Property.
Detailed description of the invention
Fig. 1 is the optical fibre grating acceleration sensor knot that the utility model is measured for the stem slamming load of Ship Structure
Structure schematic diagram；
Fig. 2 is the optical fibre grating acceleration sensor that the utility model is measured for the stem slamming load of Ship Structure
Frequency response curve；
In figure: 1-optical fiber, 2-watertight flanges, 3-sensor outer housings, the 4-the first grating, 5-mass blocks, 6-shells
Lid fixation hole, 7-casing covers, the 8-the second grating, 9-pedestals, 10-temperature-compensating gratings, 11-pedestal fixation holes, 12-hinges
Chain.
Specific embodiment
The utility model is described below by specific embodiment.Unless stated otherwise, used in the utility model
Technological means is method known in those skilled in the art.In addition, embodiment be interpreted as it is illustrative, rather than limit
The spirit and scope of the scope of the utility model, the utility model is limited only by the claims that follow.For those skilled in the art
For member, under the premise of without departing substantially from the utility model in essence and range, to the material component and dosage in these embodiments
The various changes of progress or change also belong to the protection scope of the utility model.With reference to the accompanying drawings and detailed description to this
Utility model is further described in detail.
Embodiment 1
The optical fibre grating acceleration sensor that stem slamming load for Ship Structure measures, it is characterised in that described
Sensor includes: sensor outer housing 3, sensor outer housing lid 7, acceleration transducer Sensitive Apparatus, hinge arrangement.Wherein sensor
Shell 3 be by aluminium alloy by cutting, polishing, oxidation and etc. disposably be process, without splicing welding process, biography
The side of sensor shell 3 is equipped with watertight flange 2.Sensor outer housing lid 7 is surrounded by sealed groove, and embedding in sealed groove
Set installation sealing strip is equipped with threaded fixation hole 6 in sensor outer housing lid 7, is carried out by fixed screw with sensor outer housing 3 close
Envelope.
Acceleration transducer Sensitive Apparatus is by the pre- of two wavelength different the first grating 4 and the second grating 8 of connecting
The optical fiber 1 and temperature-compensating grating 10 for stretching 2mm are constituted.Two grating regions of fiber grating use epobond epoxyn point
It is not pasted between mass block 5 and the top and bottom of pedestal 9, transmission cable is connected to by watertight flange 2.
The hinge arrangement is differential symmetry hinge arrangement, it is made of a monolith beryllium-bronze, by linear incision and
Processing, is an overall model.The use of differential configuration can greatly enhance the sensitivity of sensor, promote sensor measurement ship
The range of bow slamming load amount.
Embodiment 2
Application method includes:
Since there are two grating regions for acceleration transducer Sensitive Apparatus tool, when sensor is static, (FBG) demodulator can
To detect two center reflection wavelengths of grating fibers.When stem is generated vibration by wave stroke, in the sensing being sealed
It will be changed inside device with identical frequency.Since mass block 5 has big inertia, will be generated between mass block 5 and pedestal 9
Relative motion.When mass block 5 is mobile slight expansion can occur for the grating for being pasted onto mass block 5 and pedestal 9.According to optical fiber coupling
Molding is theoretical, and when fiber bragg grating is influenced by the external world, center reflection wavelength can drift about.Therefore, optic fiber grating wavelength will
Correspondingly change.Since two gratings generate opposite deformation direction, the sensitivity of the sensor increases one times.
The stem slamming load amount of Ship Structure shows in the form of the wavelength change of fiber grating at (FBG) demodulator end, optical fiber
The deformation of grating and the wavelength change of fiber grating are substantially linear relationship, by the backoff algorithm at (FBG) demodulator end, are finally obtained
Obtain the stem slamming load magnitude of wavelength and Ship Structure.
Embodiment 3
The influence that measures ship stem slamming load of temperature is eliminated using reference grating method, with not strained effect
Grating realizes temperature measurement, is fused to acceleration transducer Sensitive Apparatus, is placed in sensor.Sensor once encapsulates
It completes, fiber bragg grating center wavelength variable quantity will not be affected by temperature, caused by the impact only generated with stem by wave
It is related to strain wavelength shift, to realize the fiber-optic grating sensor of temperature self-compensation.
As a result illustrate: can be obtained after calculating the sensor frequency be sensitivity within the scope of 0-100 Hz be 284 pm/
g。
Claims (1)
1. a kind of optical fibre grating acceleration sensor for the measurement of stem slamming load, it is characterised in that it includes: sensor
Shell (3), sensor outer housing lid (7), acceleration transducer Sensitive Apparatus, hinge arrangement；
Wherein sensor outer housing (3) is to be processed and formed at one time by aluminium alloy by cutting, polishing, oxidation step, outside sensor
The side of shell is equipped with watertight flange (2), and sensor outer housing lid (7) is surrounded by sealed groove, and nested in sealed groove
Sealing strip is installed, sensor outer housing is covered with threaded fixation hole (6), close by fixed screw and sensor outer housing (3) progress
Envelope；The acceleration transducer Sensitive Apparatus is by connect two wavelength different first grating (4) and the second grating (8)
Pre-stretching 2mm optical fiber (1) and temperature-compensating grating (10) constitute, two grating regions of grating are bonded using epoxy resin
Agent is respectively adhered between mass block (5) and the top and bottom of pedestal (9), is connected to transmission cable by watertight flange (2)；
The hinge arrangement is differential symmetry hinge arrangement, it is made of a monolith beryllium-bronze, by linear incision and processing
Overall model；Including pedestal (9), pedestal fixation hole (11), flexible hinge (12), mass block (5)；Mass block (5) is logical
It crosses flexible hinge (12) to connect with pedestal (9), pedestal is directly connected to sensor outer housing (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920214085.1U CN209459808U (en) | 2019-02-20 | 2019-02-20 | Optical fibre grating acceleration sensor for the measurement of stem slamming load |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920214085.1U CN209459808U (en) | 2019-02-20 | 2019-02-20 | Optical fibre grating acceleration sensor for the measurement of stem slamming load |
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| CN209459808U true CN209459808U (en) | 2019-10-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113624990A (en) * | 2021-08-06 | 2021-11-09 | 西北大学 | Acceleration sensor based on ultrashort fiber bragg grating optical fiber |
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2019
- 2019-02-20 CN CN201920214085.1U patent/CN209459808U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113624990A (en) * | 2021-08-06 | 2021-11-09 | 西北大学 | Acceleration sensor based on ultrashort fiber bragg grating optical fiber |
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