CN205138602U - Optic fibre liquid level measurement device of light path is received to two bills - Google Patents
Optic fibre liquid level measurement device of light path is received to two bills Download PDFInfo
- Publication number
- CN205138602U CN205138602U CN201520933693.XU CN201520933693U CN205138602U CN 205138602 U CN205138602 U CN 205138602U CN 201520933693 U CN201520933693 U CN 201520933693U CN 205138602 U CN205138602 U CN 205138602U
- Authority
- CN
- China
- Prior art keywords
- light path
- optical fiber
- optical
- liquid level
- optic fibre
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The utility model relates to a water conservancy hydrology detection technique, concretely relates to optic fibre liquid level measurement device of light path is received to two bills more, including a pipe body, 12 optical divider and signal processor, signal processor includes CPU and all rather than signal connection's outer light path laser instrument, interior light path laser instrument and optical detector, there is the mounting panel that has logical unthreaded hole the body upper end, there is the float in the body, there is the alignment jig on the mounting panel, be fixed with outgoing optical collimator and receipt optical collimator on the alignment jig, outgoing optical collimator passes through optic fibre and is connected with outer light path laser instrument, receipt optical collimator passes through optic fibre and is connected with 12 optical divider's an output, its another output passes through optic fibre and is connected with interior light path laser instrument, 12 optical divider's input passes through optic fibre and is connected with optical detector, outer light path emitting optical fiber is equal with the length of interior light path optic fibre with the length sum that optic fibre was received to outer light path. The beneficial effects of the utility model are that, eliminate the measuring error that the thermo -optic effect produced, improve measurement accuracy.
Description
Technical field
The utility model relates to water conservancy hydrology detection technique, and more specifically relate to the optical fiber liquid level measurement mechanism that a kind of pair of bill receives light path, be applicable to waterworks, swimming pool, in vessel cabin, water level etc. need the fields such as liquid level information.
Background technology
Tradition hydropower station water level measure, be often made up of ball float and polycore cable, exist cable be easily struck by lightning and damage, thunder and lightning along cable transmission to Control of Power Plant room, major safety risks such as main control equipment burn.For above-mentioned situation my invention a kind of optical fiber liquid level measurement mechanism (patent No.: CN203672456U).This apparatus function essential safety, thoroughly anti-lightning strikely perfect can solve above-mentioned liquid level gauge defect.Find that the thermo-optic effect of optical fiber can affect the measuring accuracy of this device in actual applications, cause measuring error.
Utility model content
In view of this, the invention provides the liquid level emasuring device that a kind of pair of bill receives light path, receive by adopting two bill and form inside and outside light path, the optical path difference utilizing inside and outside light path to be produced by the optical fiber of equal length is identical eliminates the measuring error caused by thermo-optic effect.
The technical scheme that the utility model solves the problems of the technologies described above is as follows: a kind of pair of bill receives the optical fiber liquid level measurement mechanism of light path, it is characterized in that, comprise the body vertically arranged, 1*2 optical branching device and signal processor, the outer light path laser instrument that described signal processor comprises CPU and is all connected with its signal, interior light path laser instrument, photodetector, the lower end of described body is provided with liquid-inlet, described body upper end is provided with the installing plate with light hole, float is provided with in described body, described installing plate is provided with adjusting bracket, described adjusting bracket be fixedly connected with emergent light collimating apparatus and receive optical collimator, described emergent light collimating apparatus is connected with described outer light path laser signal by outer light path outgoing optical fiber, described reception optical collimator receives optical fiber by outer light path and is connected with an output end signal of described 1*2 optical branching device, another output terminal of described 1*2 optical branching device is connected with interior light path laser signal by interior light path optical fiber, the input end of described 1*2 optical branching device is connected with described photodetector by optical fiber, the length sum that described outer light path outgoing optical fiber and outer light path receive optical fiber is equal with the length of described interior light path optical fiber.
On the basis of technique scheme, the utility model can also do following further technological improvement.
Further, described photodetector is avalanche photodide (APD).
Further, described liquid-inlet place is provided with filter screen.
Further, described adjusting bracket is covered with containment vessel.
Further, described containment vessel is connected with described installing plate.
Further, described body is made up of water-tight corrosion-proof plastics or stainless steel.
The beneficial effects of the utility model are: use two bill to receive light path and can solve the measuring error produced by thermo-optic effect, greatly improve measuring accuracy; The distance of this measurement mechanism extended fiber greatly, also can not bad student's error even if optical fiber is very long, very with practical value.
Accompanying drawing explanation
The general frame schematic diagram of the measurement mechanism that Fig. 1 provides for the utility model;
Fig. 2 is the utility model signal processor schematic internal view.
In accompanying drawing, the list of parts representated by each label is as follows:
1, signal processor; 1-1, CPU; 1-2, outer light path laser instrument; 1-3, interior light path laser instrument; 1-4, photodetector; 2, outer light path outgoing optical fiber; 3, interior light path outgoing optical fiber; 4, containment vessel; 5, adjusting bracket; 6, emergent light collimating apparatus; 7, float; 8, filter screen; 9, body; 10, installing plate; 11, receive optical collimator; 12, outer light path receives optical fiber; 13, interior light path receives optical fiber; 14,1*2 optical branching device.
Embodiment
Be described principle of the present utility model and feature below in conjunction with accompanying drawing, example, only for explaining the utility model, is not intended to limit scope of the present utility model.
As shown in Figures 1 and 2, the utility model provides a kind of pair of bill to receive the optical fiber liquid level measurement mechanism of light path, it is characterized in that, comprise the body 9 vertically arranged, 1*2 optical branching device 14 and signal processor 1, the outer light path laser instrument 1-2 that described signal processor 1 comprises CPU1-1 and is all connected with its signal, interior light path laser instrument 1-3, photodetector 1-4, the lower end of described body 9 is provided with liquid-inlet, described body 9 upper end is provided with the installing plate 10 with light hole, float 7 is provided with in described body 9, described installing plate 10 is provided with adjusting bracket 5, described adjusting bracket 5 be fixedly connected with emergent light collimating apparatus 6 and receive optical collimator 11, described emergent light collimating apparatus 6 is connected with described outer light path laser instrument 1-2 signal by outer light path outgoing optical fiber 2, described reception optical collimator 11 receives optical fiber 12 by outer light path and is connected with an output end signal of described 1*2 optical branching device 14, another output terminal of described 1*2 optical branching device 14 is connected with interior light path laser instrument 1-3 signal by interior light path optical fiber, the input end of described 1*2 optical branching device 14 is connected with described photodetector 1-4 by optical fiber, the length sum that described outer light path outgoing optical fiber 2 and outer light path receive optical fiber 12 is equal with the length of described interior light path optical fiber.
On the basis of technique scheme, the utility model can also do following technological improvement further.
Further, described photodetector 1-4 is avalanche photodide APD.
Further, described liquid-inlet place is provided with filter screen 8.
Further, described adjusting bracket 5 is covered with containment vessel 4.
Further, described containment vessel 4 is connected with described installing plate 10.
Further, described body 9 is made up of water-tight corrosion-proof plastics or stainless steel.
The principle of work of the measurement mechanism that the utility model provides is: control outer light path laser instrument 1-2 by CPU1-1 during work and produce a branch of modulated laser light wave, this light wave transfers to emergent light collimating apparatus 6 by outer light path outgoing optical fiber 2, emergent light collimating apparatus 6 is emitted to float 7 surface after being collimated by the laser wave dispersed, and receives optical collimator 11 and the laser light wave of the reflection through float 7 can be received and utilize outer light path reception optical fiber 12 that laser light wave is transferred to signal 1*2 optical branching device 14.After the laser light wave of 1*2 optical branching device is detected by photodetector APD1-4, convert electric signal to and pass to CPU1-1, CPU1-1 can calculate the optical path difference L of single operation according to the time difference
outward, L
outwardl in=h*2+l* (n+ Δ n) formula
outwardfor optical path difference; H is the distance of float 7 to emergent light collimating apparatus 6; In formula, l is outer light path fiber lengths; N is the intrinsic refractive index of optical fiber; Δ n is the refractive index produced by thermo-optic effect, and this refractive index changes along with the change of temperature.In CPU1-1 after outer light path optical path difference calculates controls, light path laser instrument 1-3 produces another bundle modulated laser light wave, this light wave is by interior light path outgoing optical fiber 3 and directly receive optical fiber 13 by interior light path (interior light path outgoing optical fiber 3 directly receives optical fiber 13 with interior light path and connects and composes interior light path optical fiber, also can directly use an optical fiber directly to connect interior light path laser instrument 1-3 and 1*2 optical branching device 14 as interior light path optical fiber) transfer to 1*2 optical branching device 14 after be converted to electric signal by APD1-4, CPU1-1 again according to the time difference calculate single run optical path difference L
in, L
inl in=l* (n+ Δ n) formula
infor optical path difference, in formula, l is interior light path fiber lengths; N is the intrinsic refractive index of optical fiber; Δ n is the refractive index produced by thermo-optic effect, and this refractive index changes along with the change of temperature.The fiber lengths of inside and outside light path is identical, and two formulas are subtracted each other and can be obtained L
outward-L
in=h*2, can find out in formula that the Δ n produced by thermo-optic effect can offset thus eliminate the measuring error that thermo-optic effect produces, i.e. the L that records of CPU1-1
outwardwith L
indirectly subtract each other the height of water level that can convert to obtain.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (6)
1. the optical fiber liquid level measurement mechanism of a two bill receipts light path, it is characterized in that, comprise the body (9) vertically arranged, 1*2 optical branching device (14) and signal processor (1), the outer light path laser instrument (1-2) that described signal processor (1) comprises CPU (1-1) and is all connected with its signal, interior light path laser instrument (1-3), photodetector (1-4), the lower end of described body (9) is provided with liquid-inlet, described body (9) upper end is provided with the installing plate (10) with light hole, float (7) is provided with in described body (9), described installing plate (10) is provided with adjusting bracket (5), described adjusting bracket (5) be fixedly connected with emergent light collimating apparatus (6) and receive optical collimator (11), described emergent light collimating apparatus (6) is connected with described outer light path laser instrument (1-2) signal by outer light path outgoing optical fiber (2), described reception optical collimator (11) receives optical fiber (12) by outer light path and is connected with an output end signal of described 1*2 optical branching device (14), another output terminal of described 1*2 optical branching device (14) is connected with interior light path laser instrument (1-3) signal by interior light path optical fiber, the input end of described 1*2 optical branching device (14) is connected with described photodetector (1-4) by optical fiber, the length sum that described outer light path outgoing optical fiber (2) and outer light path receive optical fiber (12) is equal with the length of described interior light path optical fiber.
2. a kind of pair of bill according to claim 1 receives the optical fiber liquid level measurement mechanism of light path, and it is characterized in that, described photodetector (1-4) is avalanche photodide.
3. a kind of pair of bill according to claim 1 receives the optical fiber liquid level measurement mechanism of light path, and it is characterized in that, described liquid-inlet place is provided with filter screen (8).
4. a kind of pair of bill according to claim 1 receives the optical fiber liquid level measurement mechanism of light path, and it is characterized in that, described adjusting bracket (5) is covered with containment vessel (4).
5. a kind of pair of bill according to claim 4 receives the optical fiber liquid level measurement mechanism of light path, and it is characterized in that, described containment vessel (4) is connected with described installing plate (10).
6. a kind of pair of bill according to any one of claim 1 to 5 receives the optical fiber liquid level measurement mechanism of light path, and described body (9) is made up of water-tight corrosion-proof plastics or stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520933693.XU CN205138602U (en) | 2015-11-20 | 2015-11-20 | Optic fibre liquid level measurement device of light path is received to two bills |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520933693.XU CN205138602U (en) | 2015-11-20 | 2015-11-20 | Optic fibre liquid level measurement device of light path is received to two bills |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205138602U true CN205138602U (en) | 2016-04-06 |
Family
ID=55624386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520933693.XU Expired - Fee Related CN205138602U (en) | 2015-11-20 | 2015-11-20 | Optic fibre liquid level measurement device of light path is received to two bills |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205138602U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106017613A (en) * | 2016-05-13 | 2016-10-12 | 江苏昂德光电科技有限公司 | Optical fiber laser liquid level sensing system |
| CN106248175A (en) * | 2016-10-09 | 2016-12-21 | 深圳市迈测科技股份有限公司 | Laser fiber fluid level measuring instrument and measuring method |
| CN106643980A (en) * | 2016-12-29 | 2017-05-10 | 重庆多邦科技股份有限公司 | Laser water level indicator |
| 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 |
| CN108593052A (en) * | 2018-03-30 | 2018-09-28 | 武汉理工大学 | A kind of laser water level monitoring early-warning system |
-
2015
- 2015-11-20 CN CN201520933693.XU patent/CN205138602U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106017613A (en) * | 2016-05-13 | 2016-10-12 | 江苏昂德光电科技有限公司 | Optical fiber laser liquid level sensing system |
| CN106248175A (en) * | 2016-10-09 | 2016-12-21 | 深圳市迈测科技股份有限公司 | Laser fiber fluid level measuring instrument and measuring method |
| WO2018064846A1 (en) * | 2016-10-09 | 2018-04-12 | 深圳市迈测科技股份有限公司 | Laser fiber liquid level measuring instrument and measurement method |
| CN106643980A (en) * | 2016-12-29 | 2017-05-10 | 重庆多邦科技股份有限公司 | Laser water level indicator |
| 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 |
| CN108593052A (en) * | 2018-03-30 | 2018-09-28 | 武汉理工大学 | A kind of laser water level monitoring early-warning system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205138602U (en) | Optic fibre liquid level measurement device of light path is received to two bills | |
| CN103856260B (en) | The artificial fault of optical cable is utilized to be accurately positioned lightguide cable link trouble point | |
| CN101718571B (en) | Tilt fiber bragg grating (TFBG) liquid level change measuring instrument | |
| CN103591971B (en) | A kind of localization method of fiber grating | |
| CN202903678U (en) | Device for detecting light transmittance of conducting glass | |
| CN209027704U (en) | Steel construction stress monitoring system based on optical fiber sensing technology | |
| CN203672456U (en) | Optical fiber liquid level measuring device | |
| CN103712564A (en) | Reflection type optical fiber displacement sensor based on Y-shaped optical fiber coupler and self-focusing lens | |
| CN105043264A (en) | Fiber optic displacement sensor based on macro-bending loss effect | |
| CN101446600A (en) | Optical fiber current sensing device used for monitoring subway stray current | |
| CN105004317A (en) | Static liquid level system based on optical ranging | |
| CN105137201B (en) | A kind of optical fiber insulator insertion loss detector | |
| CN101776571B (en) | Liquid refractive index real-time measuring device and on-line measuring method | |
| CN102980615B (en) | Optical fiber vortex shedding flowmeter | |
| CN104501908A (en) | Photoelectric sensor detecting liquid level | |
| CN107588753A (en) | A kind of anallatic static level device | |
| CN102937465B (en) | Vortex street flow-meter using fiber laser | |
| CN106523927A (en) | Pipeline leakage positioning system | |
| CN102128619B (en) | Optical plumb compensator | |
| CN108760237A (en) | Detection device is lost in a kind of loss of fibre circuit and fiber end face | |
| CN205209481U (en) | Novel quiet power surveyor's level of fiber grating | |
| CN208421062U (en) | A kind of steel oil-gas pipeline monitoring of stray current device | |
| CN203908935U (en) | Automatic calibration device for laser-type extinction smoke meter | |
| CN202648678U (en) | Optical fiber probe and compound liquid optical fiber concentration meter using same | |
| CN107478577A (en) | Multiplexing fiber-optic gas sensing system based on weak optical fiber Bragg grating and optical time domain reflectometer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160406 Termination date: 20161120 |