CN202126259U - Two-dimensional inclination angle sensor based on PCF (Photonic Crystal Fiber)-LPG (liquid propane gas) - Google Patents
Two-dimensional inclination angle sensor based on PCF (Photonic Crystal Fiber)-LPG (liquid propane gas) Download PDFInfo
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- CN202126259U CN202126259U CN2011201368807U CN201120136880U CN202126259U CN 202126259 U CN202126259 U CN 202126259U CN 2011201368807 U CN2011201368807 U CN 2011201368807U CN 201120136880 U CN201120136880 U CN 201120136880U CN 202126259 U CN202126259 U CN 202126259U
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Abstract
The utility model relates to a two-dimensional inclination angle sensor based on PCF (Photonic Crystal Fiber)-LPG (liquid propane gas). A pair of PCF-LPG is made on a same PCF. Serially connected PCF-LPGs are obliquely inserted into an organic glass tube and are respectively crossed with the axis of the organic glass tube, the two cross points are coincided and are the center point of a grating; included angles between two PCF-LPGs and the axis are both theta (theta is less than 90 degrees) and the two PCF-LPGs are vertical to two planes where the axis is located. Glue is used for sealing small holes penetrating through the PCF-LPG in the wall of the organic tube, and simultaneously the glue is used for fixing the PCF-LPG, so that the PCF-LPG is in natural straightened state. One end of the organic glass tube is sealed, and cane sugar solution is injected from the other end, so that one half of the PCF-LPG is immersed in the cane sugar solution, while the rest part of the PCF-LPG is exposed in the air. One end of the PCF-LPG pair is in optical connection with a broadband light source, and the other end of the PCF-LPG pair is in optical connection with a spectrum analyzer. The organic glass tube, the cane sugar solution and the PCF-LPG pair form the two-dimensional inclination angle sensor. The two-dimensional inclination angle sensor has the advantages of being simple in structure and high in sensitivity, and can effectively eliminated the interference of temperature on the sensor.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, relates to a kind of based on photonic crystal fiber long-period gratings (long-period grating written in a photonic crystal fiber, two-dimensional tilting angle sensor PCF-LPG).
Background technology
In recent years; Incline measurement has become a part indispensable in the productive life; As be applied to safety and Health such as power engineering, civil construction project, petrochemical industry monitoring fields, along with the progress of science and technology, people to the incline measurement technology require increasingly high.Have the sensitivity advantage of higher though measure the sensor at angle of inclination based on capacitance variations, be subject to electromagnetic interference (EMI), precision is not high, and complex structure can not distributed measurement and remote monitoring, so its scope of application receives very big restriction.
Fiber grating is a kind of passive fiber device in optical fiber communication, Fibre Optical Sensor and optical information processing field extensive application prospect.Sensor based on fiber grating has anti-electromagnetic interference (EMI), collection sensing and is transmitted in advantages such as one, simple structure, can realize high-precision measurement.In recent years; Someone has proposed the gradient sensor based on bragg grating; As utilize the method for suspension weight that the power that angle changes generation is directly acted on several fiber gratings, through measuring the wavelength shift of different fiber grating, the angle and direction that can obtain tilting.But this sensor construction is complicated, and volume is bigger, and measurement range is less, unsuitable applying.(long-period fiber grating LPG) is a kind of transmission-type optical fibre device to LPFG.Compare with the ordinary optic fibre grating, the resonance wavelength of LPG and the amplitude variation of environment to external world are very responsive.(photonic crystal fiber is a kind of novel optical fiber with many superior optical characteristics PCF), like temperature-insensitive property to photonic crystal fiber.The LPG that utilization has the photonic crystal fiber making of temperature-insensitive characteristic has the characteristic of liquid level change sensitivity and the advantage of good temperature stability; We have designed the one dimension slant angle sensor (application number: 201020695730.5) based on PCF-LPG based on this characteristic; Yet; Detect owing to can only realize one dimension, range of application is restricted.The utility model utilizes two PCF-LPG to realize the two-dimensional tilting angle sensings, and is simple in structure, highly sensitive, temperature stability is good.
Summary of the invention
The utility model purpose is exactly in order to overcome the baroque problem of ordinary optic fibre grating slope angular transducer in the prior art, and a kind of PCF-LPG two-dimensional tilting angle sensor different, simple in structure fully with ordinary optic fibre grating measuring mechanism is provided.
The utility model is the technical scheme that the technical solution problem is taked:
Two-dimensional tilting angle sensor based on PCF-LPG comprises wideband light source, a pair of PCF-LPG, sucrose solution, plexi-glass tubular, spectroanalysis instrument.
A pair of PCF-LPG is made on same PCF.The PCF-LPG oblique cutting of series connection is gone into plexi-glass tubular, and respectively with the axes intersect of plexi-glass tubular, two intersection points overlap and intersection point is the mid point of grating; The angle of two PCF-LPG and axis all is θ (θ＜90 °), and orthogonal with two planes at axis place.With the aperture that passes PCF-LPG on the glue sealing organic glass tube wall, use glue fixing PCF-LPG simultaneously, so that PCF-LPG is in the stretching state of nature.One end of sealing plexi-glass tubular injects sucrose solution from the other end, 1/2nd PCF-LPG is immersed in the sucrose solution and remainder PCF-LPG is exposed in the air.The end that PCF-LPG is right is connected with wideband light source light, and the other end that PCF-LPG is right is connected with spectroanalysis instrument light.Plexi-glass tubular, sucrose solution, PCF-LPG are to constituting two-dimensional tilting angle sensor.The beneficial effect that the utility model had is:
1, the PCF-LPG of sensing unit is very responsive to liquid level change; When tilting to cause that different variations takes place two PCF-LPG grid region length that immerse in the sucrose solution because of device; Different drift values takes place in the resonance wavelength of PCF-LPG, can demodulate pitch angle change amount through monitoring two PCF-LPG wavelength shifts.
2, PCF-LPG is a kind of temperature-insensitive device, can effectively eliminate the interference of temperature to sensor.
3, the PCF-LPG of sensing unit is in the stretching state of nature, and plexi-glass tubular is a hard structure, when device tilts, can not change the stretching naturally state of PCF-LPG, to eliminate crooked interference to measuring.
4, because the sensor mechanism of the utility model does not need fiber grating suspension weight and suspension fiber grating, simple in structure so the whole sensor size is less, only constitute by plexi-glass tubular, PCF-LPG, sucrose solution.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
As shown in Figure 1, based on the two-dimensional tilting angle sensor of PCF-LPG, comprise wideband light source 1, PCF-LPG2, PCF-LPG3, sucrose solution 4, plexi-glass tubular 5, spectroanalysis instrument 6.PCF-LPG2 and PCF-LPG3 oblique cutting are gone into plexi-glass tubular, and respectively with the axes intersect of plexi-glass tubular 5, two intersection points overlap and intersection point is the mid point of grating; The angle of PCF-LPG2 and PCF-LPG3 and axis all is θ (θ＜90 °), and orthogonal with two planes at axis place.With the aperture that passes PCF-LPG2 and PCF-LPG3 on glue sealing plexi-glass tubular 5 tube walls, use glue fixing PCF-LPG2 and PCF-LPG3 simultaneously, so that PCF-LPG2 and PCF-LPG3 are in the stretching state of nature.One end of sealing plexi-glass tubular 5 injects sucrose solution 4 from the other end, 1/2nd PCF-LPG2 and PCF-LPG3 is immersed in the sucrose solution 4 and the PCF-LPG2 and the PCF-LPG3 of remainder are exposed in the air.PCF-LPG2 and PCF-LPG3 are that the PCF-LPG that on same PCF, processes is right.The end that PCF-LPG is right is connected with wideband light source 1 light, and the other end that PCF-LPG is right is connected with spectroanalysis instrument 6 light.Plexi-glass tubular 5, sucrose solution 4, PCF-LPG2 and PCF-LPG3 are to constituting two-dimensional tilting angle sensor.
The working method of this embodiment is: when this device angle of inclination is θ; The angle of PCF-LPG2 and PCF-LPG3 and surface level changes; Angle change amount is respectively φ 1 and φ 2; And then the PCF-LPG grid region length in the immersion sucrose solution changes, and causes the drift of PCF-LPG resonance wavelength, and drift value is respectively Δ λ 1 and Δ λ 2.Through the wavelength shift Δ λ 1 and Δ λ 2 that measures PCF-LPG, the counter change amount of releasing length in the PCF-LPG immersion sucrose solution, and then the included angle 1 and φ 2 of release PCF-LPG and surface level, the tilt angle theta of device can be tried to achieve.The sensitivity of this device is about the 0.25nm/ degree, if the resolution of spectroanalysis instrument is 0.01nm, the resolution of this sensor can reach 0.04 degree.This device can realize that the key factor of angle of bank measurement is:
1.PCF-LPG2 with PCF-LPG3 respectively with the axes intersect of plexi-glass tubular, two intersection points overlap and intersection point is the mid point of grating, the angle of two PCF-LPG and axis all is θ (θ＜90 °), and two planes that belong to axis are orthogonal.The grid region length change amount that immerses sucrose solution when this structure causes changing at the angle of inclination is inequality, and then causes the wavelength shift of two gratings inequality, thereby can demodulate two-dimensional tilting angle.
2. for making the solution surface level, the plexi-glass tubular diameter of choosing is wanted enough greatly to eliminate the liquid level bending that surface tension of liquid brings.
3.PCF-LPG with the angle of the bus of plexi-glass tubular should be as far as possible little, when device tilted, PCF-LPG could immerse in the sucrose solution fully like this.
4. the refractive index of choosing sucrose solution is similar to the effective refractive index of PCF-LPG covering, the sensitivity that helps improving sensor.
The grid region length of PCF-LPG2 is 1.9cm in the present embodiment, and resonance wavelength is 1566nm, and resonance wave strong point attenuation amplitude is 20dB, and wherein grid cycle is 469um, and periodicity is 40.The grid region length of PCF-LPG3 is 1.9cm, and resonance wavelength is 1525nm, and resonance wave strong point attenuation amplitude is 24dB, and wherein grid cycle is 469um, and periodicity is 40.The spacing of PCF-LPG2 and PCF-LPG3 is 50cm.The diameter of plexi-glass tubular is 4cm, high 10cm.The refractive index of sucrose solution is 1.42.
Claims (2)
1. the two-dimensional tilting angle sensor based on PCF-LPG comprises wideband light source, sucrose solution, a pair of PCF-LPG, plexi-glass tubular, spectroanalysis instrument, it is characterized in that:
A pair of PCF-LPG is made on same PCF; The PCF-LPG oblique cutting of series connection is gone into plexi-glass tubular, and respectively with the axes intersect of plexi-glass tubular, two intersection points overlap and intersection point is the mid point of grating; The angle of two PCF-LPG and axis all is θ and θ＜90 °, and orthogonal with two planes at axis place; With the aperture that passes PCF-LPG on the glue sealing organic glass tube wall, use glue fixing PCF-LPG simultaneously, so that PCF-LPG is in the stretching state of nature; One end of sealing plexi-glass tubular injects sucrose solution from the other end, 1/2nd PCF-LPG is immersed in the sucrose solution and remainder PCF-LPG is exposed in the air; The end that PCF-LPG is right is connected with wideband light source light, and the other end that PCF-LPG is right is connected with spectroanalysis instrument light; Plexi-glass tubular, sucrose solution, PCF-LPG are to constituting two-dimensional tilting angle sensor.
2. the two-dimensional tilting angle sensor based on PCF-LPG according to claim 1, the refractive index that it is characterized in that sucrose solution near but less than the effective refractive index of PCF-LPG covering.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201368807U CN202126259U (en) | 2011-04-29 | 2011-04-29 | Two-dimensional inclination angle sensor based on PCF (Photonic Crystal Fiber)-LPG (liquid propane gas) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011201368807U CN202126259U (en) | 2011-04-29 | 2011-04-29 | Two-dimensional inclination angle sensor based on PCF (Photonic Crystal Fiber)-LPG (liquid propane gas) |
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| CN202126259U true CN202126259U (en) | 2012-01-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709070A (en) * | 2018-12-29 | 2019-05-03 | 天津大学 | Composite fiber grating sensor and its refractive index and temperature double parameter measuring method |
| CN110986869A (en) * | 2019-12-11 | 2020-04-10 | 燕山大学 | Space attitude sensor based on fiber bragg grating and manufacturing and measuring methods |
| CN112502515A (en) * | 2020-10-09 | 2021-03-16 | 贵州黔冠鼎盛实业有限公司 | Intelligent electric pole with automatic gradient monitoring function |
-
2011
- 2011-04-29 CN CN2011201368807U patent/CN202126259U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709070A (en) * | 2018-12-29 | 2019-05-03 | 天津大学 | Composite fiber grating sensor and its refractive index and temperature double parameter measuring method |
| CN109709070B (en) * | 2018-12-29 | 2021-07-20 | 天津大学 | Refractive index and temperature double-parameter measuring method by using composite fiber grating sensor |
| CN110986869A (en) * | 2019-12-11 | 2020-04-10 | 燕山大学 | Space attitude sensor based on fiber bragg grating and manufacturing and measuring methods |
| CN112502515A (en) * | 2020-10-09 | 2021-03-16 | 贵州黔冠鼎盛实业有限公司 | Intelligent electric pole with automatic gradient monitoring function |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120125 Termination date: 20120429 |