CN101839748A - Reflecting type digital code type all-optical fiber liquid level sensing device - Google Patents
Reflecting type digital code type all-optical fiber liquid level sensing device Download PDFInfo
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- CN101839748A CN101839748A CN200910201701A CN200910201701A CN101839748A CN 101839748 A CN101839748 A CN 101839748A CN 200910201701 A CN200910201701 A CN 200910201701A CN 200910201701 A CN200910201701 A CN 200910201701A CN 101839748 A CN101839748 A CN 101839748A
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Abstract
The invention discloses a reflecting type digital code type all-optical fiber liquid level sensing device, wherein a floater and a reflecting type digital coded scale are arranged in a shell, a positioning rod is fixedly arranged on the floater, the positioning rod is inserted into a groove guide rail arranged on the reflecting type digital coded scale and slides in the groove guide rail, and an optical fiber array probe formed by common ends of a group of Y-shaped optical fiber beam splitters is connected to the inside of the shell; the optical fibers of the optical fiber array probe are fixed on the floater at equal space and in rows, and code reflector groups corresponding to the optical fiber positions of the optical fiber array probe are arranged at different height positions of the reflecting type digital coded scale; and a light source is input to the optical fiber beam input ports of the Y-shaped optical fiber beam splitters and emitted into the reflecting type digital coded scale through the optical fiber array probe, and the reflected light of the reflecting type digital coded scale is reflected back to the optical fiber array probe to form a binary coded liquid level signal.
Description
Technical field
The present invention relates to the digital fiber liquid level gauge of measuring liquid level in the observation and control technology field, more particularly, the present invention relates to a kind of digital encoding all-optical fiber liquid level and measure sensing device, be used for the liquid level of various substantially transparent liquid is implemented stable, measurement reliably under the slosh situation based on the optical fiber light reflection principle.
Background technology
Since 20th century the mid-1970s, because the sourceless characteristic of Fibre Optical Sensor has no effect anti-electromagnetic interference (EMI) to measurand, have high temperature resistant, high pressure resistant, anticorrosive, can be under rugged surroundings such as poisonous, nuclear radiation operate as normal, the Optical Fiber Transmission bandwidth, dynamic range is big, the hard-core characteristics of Fibre Optical Sensor profile, and be widely used.
Existing most of fibre optic liquid level sensor is to obtain continually varying liquid level numerical value by the intensity variation that the variation of measuring along with liquid level produces.The measuring method that this fibre optic liquid level sensor adopts is: the continuous pressure change of measuring liquid level is converted into liquid level change then, its measurement result is subject to liquid density variation influence, environmental stress variable effect, and the influence of sensor long term drift, be difficult to realize stable, reliable high-acruracy survey, and be difficult to accurate work under the current intelligence, can not under the slosh situation, implement stable, reliable high-acruracy survey to the liquid level of various substantially transparent liquid.Press in this area a kind of can be at the level gauging sensing device that still can implement reliable and stable work under slosh and various complex environment change.
Summary of the invention
The purpose of this invention is to provide a kind of reflecting type digital code type all-optical fiber liquid level sensing device, this device can solve following technical matters: liquid level changes employing numerical coding mode to be transmitted, the output of no current measuring-signal, and can resist various environmental interference, restarting after the power failure does not need again school zero, even when liquid fluctuating, still can keep liquid level change is carried out automatic reliable transmission.
Technical matters to be solved by this invention is achieved through the following technical solutions:
A kind of reflecting type digital code type all-optical fiber liquid level sensing device, in a housing, be provided with float, reflective numerical coding chi, be installed with a positioning rod on the described float, described backstay is inserted in the groove guide rail that is provided with on the described reflective numerical coding chi and slides in the groove guide rail, and the fiber array probe of being made up of the common port of one group of Y shape fiber optic splitter is linked in the housing; The optical fiber of described fiber array probe equidistantly in a row is fixed on the described float, and the differing heights position of described reflective numerical coding chi is provided with the fiber position corresponding codes reflector group with described fiber array probe;
One light source is imported the fibre bundle input port of described Y shape fiber optic splitter, incide described reflective numerical coding chi through described fiber array probe, thereby the described fiber array probe of the reflected light reflected back of described reflective numerical coding chi forms a binary coding liquid level signal.
The mechanism of production of binary coding liquid level signal is: because the differing heights position of reflective numerical coding chi is provided with the fiber position corresponding codes reflector group with the fiber array probe, thereby the fiber array different fiber of the popping one's head in different light signals that reflector group reflects that can obtain encoding form a binary coding liquid level signal like this.
Further, described sensing device also is provided with a light receiving unit that is connected with the receiving end optical fiber of described Y shape fiber optic splitter, described light receiving unit converts described binary coding liquid level signal to corresponding liquid level coding, sends a microcomputer signal processing unit to and obtains the liquid level digital signal.
Further, described reflective numerical coding chi is provided with the coding reflector group by the scale-of-two design.
The present invention has following beneficial effect than prior art.
Reflecting type digital code type all-optical fiber liquid level sensing device provided by the invention, utilize fiber array special on the float to pop one's head in and sensitive coding band of reflective numerical coding chi formation, moving by float tracking liquid level drives the mobile binary coding liquid level signal that obtains of fiber array probe.Convert gained binary coding liquid level signal to corresponding liquid level coding by light receiving unit, send the microcomputer signal processing unit to and obtain the liquid level digital signal.
Its major advantage is as follows: 1. do not have electric signal output, anti-electromagnetic interference (EMI): 2. anti-bubble disturbs; 3. anti-fluctuation, tilt to disturb and the interference of acceleration: the 4. various interference that cause of variations such as resisting temperature, fluid density, specific inductive capacity and refractive index.Liquid level information adopts numerical coding, and restarting after the power failure does not need again school zero, can recover behind the power interruption recovering to measure, and long-time stability are good.This apparatus structure is simple, and volume is little in light weight, and is easy to use.The present invention can reduce number of fibers significantly under the situation that does not reduce resolution, improve the manufacturability of product.
Description of drawings
The invention will be further described now to reach embodiment in conjunction with the accompanying drawings:
Fig. 1 is the structure three-view diagram of fiber array probe of the present invention;
Fig. 2 is the coding synoptic diagram of the reflective numerical coding chi of the present invention;
Fig. 3 is an optical transmission principles synoptic diagram of the present invention;
Fig. 4 is the work synoptic diagram of Y shape fiber optic splitter of the present invention;
Fig. 5 is an one-piece construction schematic top plan view of the present invention.
Among the figure: 1. light source 2.Y shape fiber optic splitter, 3. fiber array probe,
4. reflective numerical coding chi, 5, light receiving unit, 6. microcomputer signal processing unit,
7. groove guide rail, 8. float, 9. shell
Embodiment
Be illustrated in figure 5 as one-piece construction synoptic diagram of the present invention, digital code type all-optical fiber liquid level sensing device of the present invention mainly is made up of fiber array probe 3 (its structural drawing can with reference to figure 1), reflective numerical coding chi 4 (its coding synoptic diagram can with reference to figure 2), groove guide rail 7, float 8, housing 9.The top of housing 9 is provided with a fibre bundle connector, the common port of one group of Y shape fiber optic splitter 2 is formed fiber array probe 3 and is incorporated in the housing 9, the optical fiber of fiber array probe 3 equidistantly in a row is fixed on the float 8, be installed with a backstay on the float 8, backstay is inserted in the groove guide rail 7 that is provided with on the reflective numerical coding chi 4, and float 8 is along with liquid level change moves up and down in the groove guide rail 7 of reflective numerical coding chi 4.Along with moving up and down of float 8, the fiber array probe 3 on the float 8 is followed liquid level change and is moved up and down; The differing heights position of reflective numerical coding chi 4 is provided with the fiber position corresponding codes reflector group with fiber array probe 3; The emergent light of fiber array on the float 8 probe 3 projects on the coding reflector group of reflective numerical coding chi 4 and reflects then, and the pop one's head in reflected light of 3 received code reflector group of fiber array obtains a binary coding liquid level signal.
Reflective numerical coding chi 4 is provided with the coding reflector group by the scale-of-two design.Can require to adopt different reflector group codings according to different accuracy of detection during Level Detection, receive corresponding reflector group coding reflected signal by fiber array probe 3.So just can under the situation that does not reduce resolution, reduce number of fibers significantly, improve the manufacturability of product.
Be illustrated in figure 3 as optical transmission principles synoptic diagram of the present invention, parallel rays by brightness such as light source 1 send, light is injected the incident end of one group of Y shape fiber optic splitter 2, referring to Fig. 4, the fiber array probe 3 that incident light is made up of the common port of this group Y shape fiber optic splitter 2 comes out, the pop one's head in float 8 at 3 places of fiber array is followed the tracks of liquid level change, the emergent light of fiber array probe 3 projects on the coding reflector group of reflective numerical coding chi 4 and reflects, the pop one's head in reflected light signal of 3 optical fiber received code reflector group of fiber array passes through light receiving unit 5 again, microcomputer signal processing unit 6 obtains a liquid level digital signal.
The differing heights position of reflective numerical coding chi 4 is provided with the fiber position corresponding codes reflector group with fiber array probe 3; The different fiber of fiber array probe 3 is in the dark signal that the optical fiber that does not have the reflector group position then obtains " 0 ", and other optical fiber then obtain " 1 " signal, and referring to Fig. 2, black circle expression does not have the reflector group position, and white circle expression has the reflector group position.At this moment, convert gained binary coding liquid level signal to corresponding liquid level coding, send microcomputer signal processing unit 6 to, obtain the liquid level digital signal with the light receiving unit 5 that the receiving end optical fiber of Y shape fiber optic splitter 2 connects.
Reflecting type digital code type all-optical fiber liquid level sensing device provided by the invention utilizes fiber array special on float probe 3 and reflective numerical coding chi 4 to constitute a sensitive coding band, follows the tracks of liquid level by float and moves and drive fiber array probe 3 and move and obtain the binary coding liquid level signal.By light receiving unit 5 gained liquid level light coded signal is formed corresponding liquid level coded electrical signal, be transferred to microcomputer signal processing unit 6 and obtain numerical coding liquid level digital signal.
Those skilled in the art will recognize that, above-mentioned embodiment is exemplary, be in order better to make those skilled in the art can understand this patent, can not be interpreted as it is the restriction that this patent is comprised scope, so long as according to spirit that this patent discloses done anyly be equal to change or modify, all fall into the scope that this patent comprises.
Claims (5)
1. a reflecting type digital code type all-optical fiber liquid level sensing device is provided with float, reflective numerical coding chi in a housing, it is characterized in that:
Be installed with a positioning rod on the described float, described backstay is inserted in the groove guide rail that is provided with on the described reflective numerical coding chi and slides in the groove guide rail, and the fiber array probe of being made up of the common port of one group of Y shape fiber optic splitter is linked in the housing; The optical fiber of described fiber array probe equidistantly in a row is fixed on the described float, and the differing heights position of described reflective numerical coding chi is provided with the fiber position corresponding codes reflector group with described fiber array probe;
One light source is imported the fibre bundle input port of described Y shape fiber optic splitter, incide described reflective numerical coding chi through described fiber array probe, thereby the described fiber array probe of the reflected light reflected back of described reflective numerical coding chi forms a binary coding liquid level signal.
2. reflecting type digital code type all-optical fiber liquid level sensing device according to claim 1, it is characterized in that: described sensing device also is provided with a light receiving unit that is connected with the receiving end optical fiber of described Y shape fiber optic splitter, described light receiving unit converts described binary coding liquid level signal to corresponding liquid level coding, sends a microcomputer signal processing unit to and obtains the liquid level digital signal.
3. reflecting type digital code type all-optical fiber liquid level sensing device according to claim 1 is characterized in that: described reflective numerical coding chi is provided with the coding reflector group by the scale-of-two design.
4. reflecting type digital code type all-optical fiber liquid level sensing device according to claim 1 is characterized in that: the different fiber of described fiber array probe obtains different light signals according to the fiber position difference and forms a binary coding liquid level signal.
5. reflecting type digital code type all-optical fiber liquid level sensing device according to claim 4 is characterized in that: the different fiber of described fiber array probe, be in the dark signal that the optical fiber that does not have the reflector group position obtains " 0 ", and other optical fiber obtain " 1 " signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910201701A CN101839748A (en) | 2009-10-22 | 2009-10-22 | Reflecting type digital code type all-optical fiber liquid level sensing device |
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| CN200910201701A CN101839748A (en) | 2009-10-22 | 2009-10-22 | Reflecting type digital code type all-optical fiber liquid level sensing device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105549125A (en) * | 2015-12-28 | 2016-05-04 | 海南电力技术研究院 | Rainfall measurement apparatus, system and method |
| CN105784074A (en) * | 2016-04-29 | 2016-07-20 | 四川金码科技有限公司 | High-accuracy array type liquid level measurement device |
| CN110243439A (en) * | 2019-07-09 | 2019-09-17 | 南京工程学院 | A kind of urban underground water drainage pipe road distributed water level monitoring system |
| CN113932884A (en) * | 2021-10-14 | 2022-01-14 | 大连理工大学 | Liquid level measurement system based on optical fiber array liquid level sensor, preparation method and use method |
-
2009
- 2009-10-22 CN CN200910201701A patent/CN101839748A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105549125A (en) * | 2015-12-28 | 2016-05-04 | 海南电力技术研究院 | Rainfall measurement apparatus, system and method |
| CN105549125B (en) * | 2015-12-28 | 2018-03-16 | 海南电力技术研究院 | Rainfall measuring device, system and method |
| CN105784074A (en) * | 2016-04-29 | 2016-07-20 | 四川金码科技有限公司 | High-accuracy array type liquid level measurement device |
| CN110243439A (en) * | 2019-07-09 | 2019-09-17 | 南京工程学院 | A kind of urban underground water drainage pipe road distributed water level monitoring system |
| CN110243439B (en) * | 2019-07-09 | 2021-07-20 | 南京工程学院 | Urban underground drainage pipeline distributed water level monitoring system |
| CN113932884A (en) * | 2021-10-14 | 2022-01-14 | 大连理工大学 | Liquid level measurement system based on optical fiber array liquid level sensor, preparation method and use method |
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Application publication date: 20100922 |