CN206930335U - A kind of optical fiber level sensing device for increasing Dare interference based on Mach - Google Patents
A kind of optical fiber level sensing device for increasing Dare interference based on Mach Download PDFInfo
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- CN206930335U CN206930335U CN201720911350.2U CN201720911350U CN206930335U CN 206930335 U CN206930335 U CN 206930335U CN 201720911350 U CN201720911350 U CN 201720911350U CN 206930335 U CN206930335 U CN 206930335U
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Abstract
A kind of optical fiber level sensing device for increasing Dare interference based on Mach is the utility model is related to, the device includes laser, the first coupler, first collimator, the second collimater, sensitive structure, the second coupler, photodetector and host computer demodulating system；The output of the laser is connected with the input of first coupler；The output end of first coupler is divided into two-way, the input that second coupler is connected after the first collimator and second collimater is connected all the way, form feeler arm, the sensitive structure is used to fix the first collimator and second collimater and experience SEA LEVEL VARIATION, another way connects another input of second coupler, forms reference arm；The output end of second coupler is sequentially connected photodetector and the host computer demodulating system, and the structure for reaching second coupler through feeler arm and reference arm respectively from first coupler forms Mach increasing Dare interference.The utility model effectively improves the measurement accuracy and measurement range of water level.
Description
Technical field
The utility model belongs to the technical field of Fibre Optical Sensor, more particularly to a kind of light based on Mach-increasing Dare interference
Fine level sensing device.
Background technology
In some complex environments, the monitoring in real time to water level is essential.Such as groundwater resources complicated difficult is surveyed, and
Surface subsidence caused by the pollution of underground water and groundwater mining is slow change type, once accumulation is to a certain extent, will be caused not
Reversible destruction；Seabed situation is complicated, when tsunami occurs, to the people on periphery huge economic asset can be brought to lose, very
To life-threatening safety, therefore effective monitoring SEA LEVEL VARIATION is extremely important in real time.In order to improve measurement accuracy and realize non-connect
Absolute measurement is touched, using optical interference techniques, in order to simplify light channel structure and improve stability of layout, combines Fibre Optical Sensor skill
A kind of art, it is proposed that fiber optic interferometric level sensor.
Level sensor has many different types, in disclosed Patent No. CN205049204U Chinese patent,
A kind of pressure resistance type water-level gauge is proposed, the water-level gauge uses current mode piezoresistance sensor, passes through the effect of constant current source current, output
The voltage signal of change, then send to data acquisition device, the water-level gauge and lack after amplification, analog-to-digital conversion, signal transacting
Point is circuit structure complexity, serious by electromagnetic interference influence；In disclosed Patent No. CN205898251U Chinese patent,
A kind of ultrasonic water level gauge is proposed, the water-level gauge includes transmitter module, receiving module etc., and the original received is launched using ultrasonic wave
Manage to measure liquid level, but the transmitting reception of ultrasonic wave is higher to environmental requirement, may not apply under complicated severe water environment；
In disclosed Patent No. CN204461547U Chinese patent, it is proposed that a kind of fiber optic interferometric level sensor, utilize light
Fine sensing technology, Michelson interference structure is constructed, level measuring is realized by phase demodulating, but the structure is by Optical Fiber Winding
On silica cartridge, when SEA LEVEL VARIATION, optical fiber is stretched, and when optical fiber reaches limit of stretch, rubber cylinder can also carry out bullet
Property change, therefore the change of accurate response water level is unable to when fiber-draw amount is larger.
In summary, how to solve the problems, such as that level sensor measurement accuracy is low present in prior art, scope is small, still
Lack effective solution.
Utility model content
The utility model in order to solve the above problems, overcome level sensor measurement accuracy present in prior art it is low,
The problem of scope is small, the purpose of this utility model are to provide a kind of optical fiber level sensing device based on Mach-increasing Dare interference.
To achieve these goals, the utility model is using a kind of following technical scheme：
A kind of optical fiber level sensing device based on Mach-increasing Dare interference, the device include：
Laser (1), the first coupler (2), first collimator (3), the second collimater (4), sensitive structure (5), second
Coupler (6), photodetector (7) and host computer demodulating system (8)；
The output of the laser (1) is connected with the input of first coupler (2)；
The output end of first coupler (2) is divided into two-way, connects the first collimator (3) and described second all the way
Collimater (4) connects the input of second coupler (6) afterwards, forms feeler arm, and the sensitive structure (5) is used to fix institute
State first collimator (3) and second collimater (4) and experience SEA LEVEL VARIATION, another way connects second coupler (6)
Another input, form reference arm；
The output end of second coupler (6) is sequentially connected the photodetector (7) and host computer demodulating system
(8) structure for, reaching second coupler (6) through feeler arm and reference arm respectively from first coupler (2) forms horse
It is conspicuous-to increase Dare interference.
Further, the sensitive structure (5) includes frame frame (10), coupling (9), compact heap (11), two welding carefully
(12), the piece that is connected (13), lock-screw (14), water band (15), clamp clip (16), two transition weld tabs (17) are managed, it is described
Coupling (9) is fixed by the frame frame (10)；
The compact heap (11) compresses the water band (15), and two transition weld tabs (17) are installed on the compact heap (11)
On, two welding tubules (12) connect the first collimator (3), second collimater (4) and two transition weld tabs respectively
(17), one end of the piece that is connected (13) is fixed on the frame frame (10) by lock-screw (14), the other end and institute
It is welded together to state compact heap (11), the clamp clip (16) clamps the water band (15), realizes sealing.
Further, the coupling (9) is connected with the water band (15), and when water level changes, water passes through described outer
Joint (9) enters the water band (15).
Further, the compact heap (11) includes the first compact heap and the second compact heap, first compact heap and institute
The second compact heap is stated respectively positioned at water band both sides.
Further, the Variable between first compact heap and second compact heap, and according to the water band
(15) the water change in.
Further, two transition weld tabs (17) composition First Transition weld tabs groups, the sensitive structure also include the second mistake
Weld tabs group is crossed, the second transition weld tabs group is installed on the symmetrical side of the First Transition weld tabs group on the compact heap (11).
Further, two welding tubule (12) composition the first welding tubule groups, the sensitive structure also include the second weldering
Tubule group is connect, the second welding tubule group connects the first collimator (3), second collimater (4) and second respectively
Two transition weld tabs in transition weld tabs group.
Further, the clamp clip (16) includes the first clamp clip and the second clamp clip, first clamp clip and institute
The second clamp clip is stated respectively positioned at water band both sides, and first clamp clip and the second clamp clip are connected with frame frame (10).
Further, the laser (1) uses frequency swept laser.
Further, the distance and second collimater that first coupler (2) is arrived between the first collimator (3)
(4) it is that first coupler (2) directly arrives second coupling by optical fiber apart from sum to second coupler (6)
The distance of device (6).
The operation principle of the device is：
The coupling (9) of the sensitive structure (5) directly contacts with water, and when water level changes, water passes through institute
To state coupling (9) and enter the water band (15), water band (15) reclaimed water becomes more, increases the gap of the compact heap (11),
Distance between the first collimator (3) and second collimater (4) also increases, and causes the length of feeler arm in interference structure
Change, then cause the phase of interference signal to change.
In the utility model, using two collimator structures, when SEA LEVEL VARIATION, change two collimater spacing, no
Limited by optical fiber amount of tension, the measurement accuracy and measurement range of water level can be improved simultaneously.It effectively prevent conventional water level gauge
By Optical Fiber Winding on paravariable column body, when SEA LEVEL VARIATION, optical fiber is stretched, and when optical fiber reaches limit of stretch, rubber cylinder is also
Flexible change can be carried out, the problem of influenceing water level measurement accuracy.
In the utility model, the coupling of sensitive structure directly contacts with water, and when water level changes, water passes through outer
Joint enters water band, and water band reclaimed water becomes more, increases the gap of compact heap, the distance between two collimaters also increases, and causes to do
The length for relating to feeler arm in structure changes, and then causes the phase of interference signal to change.Realize and be based on Mach-increasing
The optical fiber level measuring of Dare interference, improves water level measurement accuracy.
The beneficial effects of the utility model：
(1) a kind of optical fiber level sensing device based on Mach-increasing Dare interference of the present utility model, using two collimations
Device structure, when SEA LEVEL VARIATION, change two collimater spacing, do not limited by optical fiber amount of tension, water level can be improved simultaneously
Measurement accuracy and measurement range.The utility model effectively prevent conventional water level gauge by Optical Fiber Winding on paravariable column body, when
Optical fiber is stretched during SEA LEVEL VARIATION, but when optical fiber reaches limit of stretch, rubber cylinder can also carry out Flexible change, influences
The problem of water level measurement accuracy.
(2) a kind of optical fiber level sensing device based on the interference of Mach-increasing Dare of the present utility model, sensitive structure it is outer
Joint directly contacts with water, and when water level changes, water enters water band by coupling, and water band reclaimed water becomes more, makes compact heap
Gap increase, the distance between two collimaters also increases, causes the length of feeler arm in interference structure to change, then lead
The phase of interference signal is caused to change.The optical fiber level measuring based on Mach-increasing Dare interference is realized, improves water level survey
Accuracy of measurement.
Brief description of the drawings
Fig. 1 is a kind of structure chart of optical fiber level sensing device based on Mach-increasing Dare interference of the present utility model；
Fig. 2 is a kind of system block diagram of optical fiber level sensing device based on Mach-increasing Dare interference of the present utility model；
Fig. 3 is sensitive structure in a kind of optical fiber level sensing device based on Mach-increasing Dare interference of the present utility model
Structure chart；
Fig. 4 is sensitive structure in a kind of optical fiber level sensing device based on Mach-increasing Dare interference of the present utility model
Profile.
Wherein, 1. laser, 2. first couplers, 3. first collimators, 4. second collimaters, 5. sensitive structures, 6.
Two couplers, 7. photodetectors, 8. host computer demodulating systems, 9. couplings, 10. frame frames, 11. compact heaps, 12. welding are thin
Pipe, 13. are connected piece, 14. lock-screws, 15. water bands, 16. clamp clips, 17. transition weld tabs.
Embodiment：
It is noted that described further below is all exemplary, it is intended to provides further instruction to the application.It is unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
In the case where not conflicting, the feature in embodiment and embodiment in the application can be mutually combined.Tie below
Closing accompanying drawing, the utility model is described in further detail with embodiment.
Embodiment 1：
As background technology is introduced, the utility model is overcome present in prior art to solve the above problems
The problem of level sensor measurement accuracy is low, scope is small, the first purpose of the present utility model are to provide one kind and are based on Mach-increasing moral
The optical fiber level sensing device of your interference.
To achieve these goals, the utility model is using a kind of following technical scheme：
As shown in figure 1,
A kind of optical fiber level sensing device based on Mach-increasing Dare interference, the device include：
Laser (1), the first coupler (2), first collimator (3), the second collimater (4), sensitive structure (5), second
Coupler (6), photodetector (7), host computer demodulating system (8).
Wherein, sensitive structure (5) is used to fix two collimaters, as shown in Figure 3 and Figure 4, including coupling (9), frame frame
(10), compact heap (11), two welding tubules (12), the piece that is connected (13), lock-screw (14), water band (15), clamp clips
(16), two transition weld tabs (17).Coupling (9) is connected with other parts by frame frame (10), and compact heap (11) compresses water band
(15), two welding tubules (12) connect two collimaters and two transition weld tabs (17) respectively, and the one of the piece that is connected (13)
End is fixed by lock-screw (14), and the other end and compact heap (11) are welded together, and clamp clip (16) clamps water band (15), realizes
Sealing, transition weld tabs (17) are arranged on compact heap (11).
The coupling (9) is connected with the water band (15), and when water level changes, water is entered by the coupling (9)
Enter the water band (15).
The compact heap (11) includes the first compact heap and the second compact heap, and first compact heap compresses with described second
Block is respectively positioned at water band both sides.
Variable between first compact heap and second compact heap, and according to the water in the water band (15)
Amount change.
Two transition weld tabs (17) form First Transition weld tabs group, and the sensitive structure also includes the second transition weld tabs group,
The second transition weld tabs group is installed on the symmetrical side of the First Transition weld tabs group on the compact heap (11).
Two welding tubule (12) composition the first welding tubule groups, the sensitive structure also include the second welding tubule group,
The second welding tubule group connects the first collimator (3), second collimater (4) and the second transition weld tabs group respectively
In two transition weld tabs.
The clamp clip (16) includes the first clamp clip and the second clamp clip, and first clamp clip clamps with described second
Respectively positioned at water band both sides, first clamp clip and the second clamp clip are connected piece with frame frame (10).
The coupling (9) of sensitive structure (5) is directly contacted with water, and when water level changes, water is entered by coupling (9)
Entering water band (15), water band (15) reclaimed water becomes more, increases the gap of compact heap (11), and the distance between two collimaters also increases,
Cause the length of feeler arm in interference structure to change, then cause the phase of interference signal to change.
As depicted in figs. 1 and 2, the output of laser (1) is connected with the input of the first coupler (2), the first coupler
(2) output end is divided into two-way, connects first collimator (3) all the way and the second collimater (4) is followed by the defeated of the second coupler (6)
Enter end, form feeler arm, sensitive structure (5) is used for fixing two collimaters and can experiencing SEA LEVEL VARIATION, and another way directly connects
Another input of the second coupler (6) is connect, forms reference arm, the output termination photodetector of the second coupler (6)
(7) structure for, reaching the second coupler through feeler arm and reference arm respectively from the first coupler forms Mach-increasing Dare interference,
Photodetector (7) is connected to host computer demodulating system (8).
A kind of application method of optical fiber level sensing device based on the interference of Mach-increasing Dare of the present utility model include with
Lower step：
(1) initial frequency, scanning step frequency and the working time of laser (1) are obtained, scan frequency is calculated, counts respectively
Calculate output field strength of the first coupler (2) the output two ways of optical signals by feeler arm and reference arm；
(2) output intensity and ginseng of feeler arm are calculated respectively according to the output field strength of the output field strength of feeler arm and reference arm
The output intensity of arm is examined, the interference of feeler arm and reference arm is calculated according to the output intensity of the output intensity of feeler arm and reference arm
Light intensity, thus calculate phase difference of the first coupler (2) output two ways of optical signals after feeler arm and reference arm；Will
The distance between first collimator (3) and the second collimater (4) is calculated to time diffusion in phase difference；
(3) according to the distance between first collimator (3) and the second collimater (4), with reference to the pressure formula and water level of water level
Pressure and first collimator (3) and the second collimater (4) between distance relation, finally calculate current water level value.
In the present embodiment, specific method and step is：
A kind of laser (1) in optical fiber level sensing device based on Mach-increasing Dare interference uses frequency swept laser,
The initial frequency of laser (1) is designated as f0, the scan frequency of laser (1) is designated as f, and：
F=f0+kt
Wherein k is the scanning step frequency of laser (1), and t is the frequency sweep time of laser (1).
In the present embodiment, the initial frequency f of laser (1)0For 191200GHz, the scanning step frequency of laser (1)
K is 1GHz, and the scan frequency f of laser (1) is：
F=191200GHz+1GHz × t
The distance that first coupler (2) is arrived between first collimator (3) is L1, the distance between two collimaters is the first collimation
Distance between device (3) and the second collimater (4) is Δ L, and the distance of the second collimater (4) to the second coupler (6) is L2, from
One coupler (2) is L directly to the distance of the second coupler (6) by optical fiber3, and L1+L2=L3。
First coupler (2) exports two ways of optical signals, respectively by feeler arm and reference arm, its field strength expression formula difference
For：
Wherein E1For the output field strength of feeler arm, E2For the output field strength of reference arm, E0For constant, n is refractive index, and C is light
Speed,The initial phase of optical signal is exported for the first coupler (2).
In the present embodiment, by the initial frequency f of laser (1)0For 191200GHz, the scanning Step Frequency of laser (1)
Rate k is the output field strength E that 1GHz substitutes into feeler arm1With the output field strength E of reference arm2Calculation formula：
The interference light intensity of feeler arm and reference arm is：
Wherein I1For the output intensity of feeler arm, I2For the output intensity of reference arm,For the first coupler (2) output two
Phase difference of the road optical signal after feeler arm and reference arm.
The exchange item signal of interference light intensity is：
Hilbert transform is done with the interference light intensity I of the reference arm item signal I ' that exchanges to the feeler arm of discretization, obtained
First coupler (2) exports phase difference of the two ways of optical signals after feeler arm and reference armFor：
In the present embodiment, by the initial frequency f of laser (1)0For 191200GHz, the scanning Step Frequency of laser (1)
Rate k is that 1GHz substitutes into above-mentioned formula：
First coupler (2) exports phase difference of the two ways of optical signals after feeler arm and reference armWith frequency sweep time t
Change, doing differential to frequency sweep time t can obtain：
In the present embodiment,
Therefore the distance between two collimaters is：
In the present embodiment,
Wherein,Computational methods it is as follows：
Hilbert transform is done to the I ' of discretization first, and obtains phase valueBecause phase occurs to jump side at π,
In order to obtain real phase place change, do phase unwrapping around and calculate the relation of phase and frequency sweep time, then to phase value and
The frequency sweep time does curve matching, obtains the slope of matched curve, is
The pressure formula of water level is：
P=ρ gh
Wherein ρ is the density of water, and g is acceleration of gravity, and h is current level value.
The pressure of water level and two collimater separation delta L relation are：
P=C1×ΔL
Wherein C1The constant determined for mechanical structure.
Then current level value h is：
The measurement range of water level is by the slope after phase-fittingDetermined with scanning step frequency k:
Maximum change amount is 2 π in unit interval, then Δ L maximums are In unit interval most
Small knots modification is 2 π/N, and wherein N=5000 is frequency step number, then Δ L minimum values areTherefore water level h
Measurement range be
The measurement accuracy of water levelDetermined by scanning stepping number:
The preferred embodiment of the application is the foregoing is only, is not limited to the application, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Claims (10)
1. a kind of optical fiber level sensing device based on Mach-increasing Dare interference, it is characterized in that：The device includes：
Laser, the first coupler, first collimator, the second collimater, sensitive structure, the second coupler, photodetector and
Host computer demodulating system；
The output of the laser is connected with the input of first coupler；
The output end of first coupler is divided into two-way, connects after connecting the first collimator and second collimater all the way
Connect the input of second coupler, form feeler arm, the sensitive structure is used to fixing the first collimator and described
Second collimater simultaneously experiences SEA LEVEL VARIATION, and another way connects another input of second coupler, forms reference arm；
The output end of second coupler is sequentially connected photodetector and the host computer demodulating system, from first coupling
The structure that clutch reaches second coupler through feeler arm and reference arm respectively forms Mach-increasing Dare interference.
2. a kind of optical fiber level sensing device based on Mach-increasing Dare interference as claimed in claim 1, it is characterized in that：Institute
Stating sensitive structure includes frame frame, coupling, compact heap, welds tubule, the piece that is connected, lock-screw, water band, clamp clip and mistake
Weld tabs is crossed, the coupling is fixed by the frame frame；
The compact heap compresses the water band, and two transition weld tabs are installed on the compact heap, and two welding tubules connect respectively
The first collimator, second collimater and two transition weld tabs are connect, one end of the piece that is connected passes through locking screw
Nail is fixed, and the other end and the compact heap are welded together, and the clamp clip clamps the water band, realizes sealing.
3. a kind of optical fiber level sensing device based on Mach-increasing Dare interference as claimed in claim 2, it is characterized in that：Institute
Coupling and the water band connection are stated, when water level changes, water enters the water band by the coupling.
4. a kind of optical fiber level sensing device based on Mach-increasing Dare interference as claimed in claim 2, it is characterized in that：Institute
Stating compact heap includes the first compact heap and the second compact heap, and first compact heap is with second compact heap respectively positioned at described
Water band both sides.
5. a kind of optical fiber level sensing device based on Mach-increasing Dare interference as claimed in claim 4, it is characterized in that：Institute
The Variable between the first compact heap and second compact heap is stated, and is changed according to the water in the water band.
6. a kind of optical fiber level sensing device based on Mach-increasing Dare interference as claimed in claim 2, it is characterized in that：Two
Individual transition weld tabs forms First Transition weld tabs group, and the sensitive structure also includes the second transition weld tabs group, the second transition weldering
Piece group is installed on the symmetrical side of the First Transition weld tabs group on the compact heap.
7. a kind of optical fiber level sensing device based on Mach-increasing Dare interference as claimed in claim 6, it is characterized in that：Two
Individual welding tubule composition the first welding tubule group, the sensitive structure also include the second welding tubule group, and second welding is thin
Pipe group connects two transition weld tabs in the first collimator, second collimater and the second transition weld tabs group respectively.
8. a kind of optical fiber level sensing device based on Mach-increasing Dare interference as claimed in claim 2, it is characterized in that：Institute
Stating clamp clip includes the first clamp clip and the second clamp clip, and first clamp clip is with second clamp clip respectively positioned at described
Water band both sides, first clamp clip and the second clamp clip are connected with frame frame.
9. a kind of optical fiber level sensing device based on Mach-increasing Dare interference as claimed in claim 1, it is characterized in that：Institute
State laser and use frequency swept laser.
10. a kind of optical fiber level sensing device based on Mach-increasing Dare interference as claimed in claim 1, it is characterized in that：Institute
State distance of first coupler to the distance between the first collimator and second collimater to second coupler it
With the distance for directly arriving second coupler by optical fiber for first coupler.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402054A (en) * | 2017-07-25 | 2017-11-28 | 吉林大学 | A kind of optical fiber level sensing device and method for increasing Dare interference based on Mach |
| CN109211356A (en) * | 2018-11-09 | 2019-01-15 | 珠海任驰光电科技有限公司 | A kind of fiber optic interferometric water level sensor and method for sensing based on frequency shift technique |
-
2017
- 2017-07-25 CN CN201720911350.2U patent/CN206930335U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402054A (en) * | 2017-07-25 | 2017-11-28 | 吉林大学 | A kind of optical fiber level sensing device and method for increasing Dare interference based on Mach |
| CN107402054B (en) * | 2017-07-25 | 2023-08-15 | 吉林大学 | Optical fiber water level sensing device and method based on Mach-Zehnder interference |
| CN109211356A (en) * | 2018-11-09 | 2019-01-15 | 珠海任驰光电科技有限公司 | A kind of fiber optic interferometric water level sensor and method for sensing based on frequency shift technique |
| CN109211356B (en) * | 2018-11-09 | 2023-10-10 | 珠海任驰光电科技有限公司 | Optical fiber interference water level sensor and sensing method based on frequency shift technology |
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