CN204854887U - Optic fibre point type level sensor - Google Patents
Optic fibre point type level sensor Download PDFInfo
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- CN204854887U CN204854887U CN201520510484.4U CN201520510484U CN204854887U CN 204854887 U CN204854887 U CN 204854887U CN 201520510484 U CN201520510484 U CN 201520510484U CN 204854887 U CN204854887 U CN 204854887U
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- optical fiber
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Abstract
The utility model discloses an optic fibre point type level sensor belongs to photoelectric sensor for to the warning of the upper and lower limit of liquid level, instruction etc. Utilize the fiber optic probe to the sensitiveness of light intensity, the liquid level height is measured to light through fiber optic probe scattering circumstances difference in air and liquid. The utility model discloses comprise optical fiber bundle and processing circuit, wherein the optical fiber bundle includes that launching fiber restraints and receives the optical fiber bundle, and the wedge terminal surface of optical fiber bundle constitutes the probe end face, and the wedge terminal surface helps improving the sensitivity that detects the liquid level and preventing the liquid drop adhesion, processing circuit installs the other end of restrainting and receive the optical fiber bundle in launching fiber, constitutes circuit and the integrated structure of probe. The sensor carries out data communication through communication mode such as RS485, CAN or industrial ethernet with the host computer. The utility model discloses the size is little, light in weight, and the integration, the installation and maintenance of being convenient for, the appearance space is light and handy, and sensitivity is high, and signal processing is simple, does not have movable annex, and the reliability is high.
Description
Technical field
The utility model belongs to photoelectric sensor technical field, is specifically related to a kind of optical fiber point type liquid level sensor, for reporting to the police to liquid level bound, instruction etc.
Background technology
Along with the progress of science and technology of aviation, liquid level condition in accurate understanding state of flight lower fuel tank, has great significance for raising airborne combat ability and security performance in real time.Sensor at present for level gauging has many deficiencies: static pressure type liquid level sensor is subject to fluid density impact, there is the problem that degree of accuracy is low; Sensor must be fixed in liquid cell by capacitance level transducer when mounted, needs again to demarcate and periodic maintenance zero point test after installation, the accuracy that guarantee is measured, and its measurement life-span is short, and repeatability is low; If float or the contaminated float movement that can limit of float-type gearing produce fault, during measurement, float can fluctuate up and down along with the instability of liquid level, is not suitable for pressure vessel and strongly corrosion liquid measurement; The identical point of this type of contact measuring method measures Sensitive Apparatus need contact fluid to be measured, and measuring element can be worn and easy adhering liquid, particularly bar type structure device, safeguards, and cannot meet industry spot Based Intelligent Control demand because installing space is large, difficult.Although ultrasonic liquid level sensor is convenient to installation and maintenance, response is fast, can be used for the toxic and strong liquid measure of adhesiveness; But precision is little and error large, rectification building-out is complicated, and measurement blind area is large, data are unstable.
In recent years, fibre optic liquid level sensor is rapidly developed with the advantage of himself.Researchist proposes the optical fiber point type liquid level sensor based on prism total internal reflection, utilizes the liquid of different refractivity on the impact of prism total internal reflection, judges whether prism end face contacts with liquid level by measuring reflective light intensity.This sensor can only monitor a liquid level, and is integrated with high requirement to prism and optical fiber.
Utility model content
The purpose of this utility model is to provide a kind of optical fiber point type liquid level sensor, can measure single or multiple liquid level.This sensor utilizes fibre-optical probe to the susceptibility of light intensity, measures liquid level by light scattering situation in air with liquid of fibre-optical probe is different.
To achieve these goals, the utility model provides a kind of optical fiber point type liquid level sensor, comprise fibre bundle and signal processing circuit, wherein fibre bundle comprises launching fiber bundle and receives fibre bundle, described launching fiber bundle also becomes to concentrate fibre bundle with reception optical fiber bundle end portion, concentrate the wedge shape end face of fibre bundle to form detection end face, signal processing circuit is installed on launching fiber bundle and receives the other end of fibre bundle, and described sensor carries out data communication by bus and host computer.
In an embodiment of the present utility model, described signal processing circuit comprises luminescent device, photoelectric switching circuit, amplifying circuit and data collection and analysis circuit, wherein the other end of launching fiber bundle is connected with described luminescent device, the other end receiving fibre bundle is connected with photoelectric switching circuit, luminescent device is for launching infrared light, described photoelectric switching circuit is used for receiving optical signals and light signal is converted to electric signal, described amplifying circuit is used for amplification signal, described data collection and analysis circuit is used for electric signal to be converted into digital quantity by analog quantity, and then analytic signal obtains liquid level information.
In an embodiment of the present utility model, described launching fiber bundle and reception fibre bundle are one one receipts, two receipts, multicast or a MIMO (Multiple-Input Multiple-Out-put) pattern at the end face distribution form of concentrated fibre bundle.
In an embodiment of the present utility model, described launching fiber bundle and reception fibre bundle are parallel distribution, concentric circles distribution or stochastic distribution at the end face distribution form of concentrated fibre bundle.
In an embodiment of the present utility model, the wedge angle of described probe end face wedge structure can be processed into 15 degree or 30 degree or 60 degree, and this wedge angle can change in the angular interval of 10 degree to 90 degree.
In an embodiment of the present utility model, described probe end face forms multi-end surface by multiple wedge shape end face and pops one's head in, and can detect multiple liquid level on a sensor simultaneously.
In an embodiment of the present utility model, the light signal of described reception fibre bundle can carry out signal differential detection by direct mimic channel after photoelectric switching circuit, or carries out signal differential detection after being converted to digital signal by simulating signal.
In an embodiment of the present utility model, described sensor adopts RS485, CAN or Industrial Ethernet communication mode, carries out data communication with host computer.
The utility model optical fiber point type liquid level sensor size is little, lightweight, and structure is simple, is convenient to install, and highly sensitive, signal transacting is simple, and without movable annex, reliability is high; Be applicable to measure the warning of liquid level upper and lower limit, instruction etc.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the utility model optical fiber point type liquid level sensor;
Fig. 2 is the structural representation of optical fiber point type liquid level sensor in the utility model one embodiment;
Fig. 3 is the end face structure vertical view of the utility model embodiment, and launching fiber bundle receives the parallel distribution of pattern with reception fibre bundle at the end face one two of concentrated fibre bundle;
Fig. 4 is the enforcement state that launching fiber bundle and reception fibre bundle distribute at the end face concentric circles of concentrated fibre bundle;
Fig. 5 is launching fiber bundle and receives fibre bundle in the random equally distributed enforcement state of the end face of concentrated fibre bundle;
Fig. 6 is another embodiment of the present utility model, forms Double End and pops one's head in, can measure 2 liquid levels simultaneously by two wedge shape end faces.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.In addition, if below in described each embodiment of the utility model involved technical characteristic do not form conflict each other and just can mutually combine.
In FIG, launching fiber bundle 3 and two-way receive fibre bundle 6, and (receiving fibre bundle can be 1 road or multichannel, for 2 tunnels in the present embodiment) the end also concentrated fibre bundle of one-tenth, its end face forms probe end face 4, the contour structures of its end face is arbitrarily angled wedge structure, and wedge shape end face contributes to raising and detects the sensitivity of liquid level and prevent drop from adhering to.The other end of launching fiber bundle 3 is connected with luminescent device 8, and the other end receiving fibre bundle 6 is connected with phototriode 7, and luminescent device 8 is for launching infrared light, and phototriode 7 is for receiving optical signals.
Its principle of work is: when the non-contact sonde end face 4 of the liquid 1 in testee 2, luminescent device 8 utilizing emitted light goes out to inject in air along launching fiber bundle 3, probe end face 4, because light hardly scattering occurs in atmosphere, substantially can not enter and receive optical fiber 6, phototriode 7 detects propagates the utilizing emitted light of returning less than any through receiving optical fiber 6, and the differential signal obtained through differential amplification is almost nil.When liquid level 1 contact sonde end face 4 in testee 2, luminescent device 8 utilizing emitted light along launching fiber bundle 3, probe end face 4, to scatter to through liquid 1 major part and probe end face 4 enters two bundles receive on optical fiber 6, major part light is received optical fiber 6 and receives, in signal deteching circuit, two-way is received the light signal that fibre bundle 6 obtains and is converted to electric signal by phototriode 7, and being converted to voltage signal difference through prime amplifier and involves two stage differential amplifiers, the differential signal receiving optical fiber 6 will much larger than zero through amplifying the amplitude obtained.Therefore, wedge shape probe end face 4 place have no liquid 1 and probe end face 4 contact liq position different time, probe end face 4 receives the signal of different light intensity, and sensor output signal value has obvious difference.Just can judge whether liquid level 1 contacts the wedge shape probe end face 4 of Fibre Optical Sensor accordingly, thus judge the state of liquid level 1, two position alarm function can be realized.
If receiving fibre bundle is 1 bundle, when the non-contact sonde end face 4 of liquid 1, the light that phototriode 7 detects is zero substantially, and light signal is converted into electric signal, and electric signal is less; When liquid 1 contact sonde end face 4, the light that phototriode 7 detects, light signal is converted into electric signal, electric signal do not need difference directly through amplify after amplitude will much larger than zero, the difference according to output signal value judges liquid level.
If receiving fibre bundle is 2 bundles or multi beam, then two-way is received the light signal that fibre bundle 6 obtains and is converted to electric signal by phototriode 7, and is converted to voltage signal difference through prime amplifier and involves two stage differential amplifiers.
In an embodiment of the present utility model, launching fiber bundle and reception optical fiber bundle end portion merge to be formed conducts fibre bundle, cavity and sensing probe partial design into a single integrated structure, cavity inside places circuit part, concentrate the wedge shape end face of fibre bundle to form probe end face, ring flange is used for fixing and connecting sensor and fluid to be measured container.When wedge shape end face sensing probe does not touch liquid, the wide part sent by launching fiber shines in air, substantially can not enter two bundles and receive optical fiber, in reception optical fiber, light does not turn back to detector substantially, therefore receives the differential signal of optical fiber close to zero.When sensing probe contact liq, the light that launching fiber sends receives on optical fiber at two bundles through liquid-scattering, and part light is received optical fiber and receives, and turns back to detector, and the differential signal receiving optical fiber will much larger than zero through amplifying the amplitude obtained.Therefore, when wedge shape end is with or without liquid comes into contact, end face receives the signal of different light intensity, and detector output signal value amplitude has obvious difference.Just can judge whether liquid level contacts the wedge shape end face of Fibre Optical Sensor accordingly, thus judge the state of liquid level, two position alarm function can be realized.
As shown in Figure 2, diameter be the metal protection protector of 15mm built with three beams optical fiber, be respectively a branch of launching fiber 2-3, two bundles receive optical fiber 2-6.Be a cavity 2-2 on the upside of sensor, circuit part can be placed in inside, and the cover plate 2-10 of cavity top plays protection circuit effect, and cavity side section is used for mounted connector 2-11.Spacer flanger dish 2-7 is used for fixing liquid level sensor.Sensor sounding chamber and downside probe segment integrated design, also save space like this.Consider sealing requirements, on the downside of it, be designed to seal groove structure.Outside sensor, metal protection protector 2-5 is that aluminum alloy materials is formed, and its physical strength is comparatively large, can meet shockproof requirements.Sensor probe part is a wedge shape end face structure, and 2-3 is the luminous signal of launching fiber from circuit part; Receive optical fiber 2-6 and can export two-way voltage signal, be used for detection probe end face whether contact liq.
If Fig. 2 is the design of point type optical fiber point type liquid level sensor integral installation figure, in figure the corresponding title of each sequence number and effect as follows:
2-1, a nut 1:5 nut are that pentagon is on ring flange
2-2, cavity: mounting circuit printed board
2-3, launching fiber bundle
2-4, sealing gasket 1: sealing lid and ring flange
2-5, metal protection protector: protection launching fiber and reception optical fiber
2-6, reception fibre bundle
2-7, ring flange: fixed connector socket
2-8, sealing gasket 2: seal socket and ring flange
2-9, a nut 2:4 nut are rectangular at ring flange opening part
2-10, lid: dust-proof, waterproof etc.
2-11, connector body: connect power supply and connection
Fig. 3 is sensor probe end face optical fiber arrangement upward view.The optical fiber point type liquid level sensor probe end face of experiment is oval, and launching fiber adopts the parallel distribution of a two receipts pattern with reception optical fiber, often restraints optical fiber and is distributed on oval end face by centerline diameter trisection, and optical fiber surface polishing keeps smooth.A branch of optical fiber near tip, inner side place is launching fiber 3, is positioned at chamfer cylinder lower side.The right two-beam fibre is and receives optical fiber 6.
Launching fiber bundle 3 and to receive fibre bundle 6 at the distribution form of probe end face 4 can also be concentric circles distribution as shown in Figure 4 or being uniformly distributed at random as shown in Figure 5.Concrete distribution form to consider transducer sensitivity, combination of fiber-optic bundle size restriction etc. because usually determining.
In figure 6, probe end face 4, concentrates fibre bundle wedge shape end face to form Double End by two-way and pops one's head in, can measure 2 liquid levels simultaneously.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (8)
1. an optical fiber point type liquid level sensor, comprise fibre bundle and signal processing circuit, wherein fibre bundle comprises launching fiber bundle and receives fibre bundle, it is characterized in that, described launching fiber bundle also becomes to concentrate fibre bundle with reception optical fiber bundle end portion, concentrate the wedge shape end face of fibre bundle to form detection end face, signal processing circuit is installed on launching fiber bundle and receives the other end of fibre bundle, and described sensor carries out data communication by bus and host computer.
2. optical fiber point type liquid level sensor as claimed in claim 1, it is characterized in that, described signal processing circuit comprises luminescent device, photoelectric switching circuit, amplifying circuit and data collection and analysis circuit, wherein the other end of launching fiber bundle is connected with described luminescent device, the other end receiving fibre bundle is connected with photoelectric switching circuit, luminescent device is for launching infrared light, described photoelectric switching circuit is used for receiving optical signals and light signal is converted to electric signal, described amplifying circuit is used for amplification signal, described data collection and analysis circuit is used for electric signal to be converted into digital quantity by analog quantity, and then analytic signal obtains liquid level information.
3. optical fiber point type liquid level sensor as claimed in claim 1 or 2, is characterized in that, described launching fiber bundle and reception fibre bundle are one one receipts, two receipts, multicast or a MIMO (Multiple-Input Multiple-Out-put) pattern at the end face distribution form of concentrated fibre bundle.
4. optical fiber point type liquid level sensor as claimed in claim 1 or 2, is characterized in that, described launching fiber bundle and reception fibre bundle are parallel distribution, concentric circles distribution or stochastic distribution at the end face distribution form of concentrated fibre bundle.
5. optical fiber point type liquid level sensor as claimed in claim 1 or 2, it is characterized in that, the wedge angle of described detection end face wedge structure can be processed into 15 degree or 30 degree or 60 degree, and this wedge angle can change in the angular interval of 10 degree to 90 degree.
6. optical fiber point type liquid level sensor as claimed in claim 1 or 2, is characterized in that, described detection end face forms multi-end surface by multiple wedge shape end face and pops one's head in, and can detect multiple liquid level on a sensor simultaneously.
7. optical fiber point type liquid level sensor as claimed in claim 1 or 2, it is characterized in that, the light signal of described reception fibre bundle can carry out signal differential detection by direct mimic channel after photoelectric switching circuit, or carries out signal differential detection after being converted to digital signal by simulating signal.
8. optical fiber point type liquid level sensor as claimed in claim 1 or 2, is characterized in that, described sensor adopts RS485, CAN or Industrial Ethernet communication mode, carries out data communication with host computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520510484.4U CN204854887U (en) | 2015-07-14 | 2015-07-14 | Optic fibre point type level sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520510484.4U CN204854887U (en) | 2015-07-14 | 2015-07-14 | Optic fibre point type level sensor |
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| CN204854887U true CN204854887U (en) | 2015-12-09 |
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| CN201520510484.4U Withdrawn - After Issue CN204854887U (en) | 2015-07-14 | 2015-07-14 | Optic fibre point type level sensor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104964727A (en) * | 2015-07-14 | 2015-10-07 | 华中科技大学 | Optical fiber dot mode liquid level sensor |
| CN106564601A (en) * | 2016-11-04 | 2017-04-19 | 华中科技大学 | Optical fiber type ice binding state sensor |
| CN107576369A (en) * | 2017-08-31 | 2018-01-12 | 广东华中科技大学工业技术研究院 | A kind of continuous liquid level sensor of optical fiber based on end face reflection coupling |
| CN107607174A (en) * | 2017-08-31 | 2018-01-19 | 广东华中科技大学工业技术研究院 | A kind of optical fiber point type liquid level sensor based on end face reflection coupling |
| CN107607175A (en) * | 2017-08-31 | 2018-01-19 | 广东华中科技大学工业技术研究院 | A kind of point type fibre optic liquid level sensor |
| CN107907238A (en) * | 2017-09-28 | 2018-04-13 | 天津大学 | A wide range of temperature sensor and production method based on optical fiber connector inclination angle |
| CN110345888A (en) * | 2019-08-09 | 2019-10-18 | 佛山市顺德区美的饮水机制造有限公司 | Measure method, apparatus, drinking equipment and the storage medium of the physical size of object |
-
2015
- 2015-07-14 CN CN201520510484.4U patent/CN204854887U/en not_active Withdrawn - After Issue
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104964727A (en) * | 2015-07-14 | 2015-10-07 | 华中科技大学 | Optical fiber dot mode liquid level sensor |
| CN104964727B (en) * | 2015-07-14 | 2019-07-19 | 华中科技大学 | A kind of optical fiber point type liquid level sensor |
| CN106564601A (en) * | 2016-11-04 | 2017-04-19 | 华中科技大学 | Optical fiber type ice binding state sensor |
| CN106564601B (en) * | 2016-11-04 | 2019-04-26 | 华中科技大学 | A kind of optical fiber type ice bonding state sensor |
| CN107576369A (en) * | 2017-08-31 | 2018-01-12 | 广东华中科技大学工业技术研究院 | A kind of continuous liquid level sensor of optical fiber based on end face reflection coupling |
| CN107607174A (en) * | 2017-08-31 | 2018-01-19 | 广东华中科技大学工业技术研究院 | A kind of optical fiber point type liquid level sensor based on end face reflection coupling |
| CN107607175A (en) * | 2017-08-31 | 2018-01-19 | 广东华中科技大学工业技术研究院 | A kind of point type fibre optic liquid level sensor |
| CN107576369B (en) * | 2017-08-31 | 2020-01-21 | 广东华中科技大学工业技术研究院 | Optical fiber continuous liquid level sensor based on end face reflection coupling |
| CN107907238A (en) * | 2017-09-28 | 2018-04-13 | 天津大学 | A wide range of temperature sensor and production method based on optical fiber connector inclination angle |
| CN107907238B (en) * | 2017-09-28 | 2020-01-17 | 天津大学 | Large-range temperature sensor based on optical fiber tail end inclination angle and manufacturing method |
| CN110345888A (en) * | 2019-08-09 | 2019-10-18 | 佛山市顺德区美的饮水机制造有限公司 | Measure method, apparatus, drinking equipment and the storage medium of the physical size of object |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151209 Effective date of abandoning: 20190719 |