CN201166261Y - Optical fiber probe for detecting transparent liquid cutoff - Google Patents
Optical fiber probe for detecting transparent liquid cutoff Download PDFInfo
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- CN201166261Y CN201166261Y CNU2008200555170U CN200820055517U CN201166261Y CN 201166261 Y CN201166261 Y CN 201166261Y CN U2008200555170 U CNU2008200555170 U CN U2008200555170U CN 200820055517 U CN200820055517 U CN 200820055517U CN 201166261 Y CN201166261 Y CN 201166261Y
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- optical fiber
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Abstract
An optical fiber probe for detecting the liquid setting off comprises a pair of optical fibers, a transparent connecting pipe with a hose jack and an optical fiber locating base which is used to fix the optical fiber ends and the transparent connecting pipe. The optical fiber probe integrates the optical fiber ends, the transparent connecting pipe and the optical fiber locating base, wherein the middle portion of the transparent connecting pipe is arranged on the center of the optical fiber locating base, and the two ends are connected with a pipeline which is used to convey detected liquid, the optical fiber ends which are mutually separated are arranged on one side of the transparent connecting pipe in the optical fiber locating base, wherein the axial lines of the optical fiber ends are intersected into an acute angle, and the other ends of the optical fibers are connected with optical fiber jacks of an optical fiber amplifier. The optical fiber probe has simple structure and small overall volume, which can be used on the detection of the liquid cut-off in medical apparatuses and the like, and also can be used on the detection of liquid level of transparent liquid in a transparent hose.
Description
Affiliated technical field
The utility model relates to a kind of photoelectric detection system of tracer liquid cutout, especially can detect the fiber optic probe of transparency liquid cutout non-contactly.
Background technique
At present, the detecting method of known liquid cutout typically uses the low profile photovoltaic sensor or the correlation optical fiber of incorporated amplifier, directly immerses it in liquid or places the outside of transparent container or transparent pipeline, changes according to the light transmittance of liquid and discerns.For diameter bigger opaque containers or ducted liquid, also can adopt the outside method that ultrasonic wave sensor is installed to detect it and whether stop.
In bioengineering and medical industry, in the operation as blood processing and cell separation, a large amount of disposable transparent flexible pipes that use are carried transparency liquid, need in the course of conveying online detection is carried out in the interruption or the termination of transparency liquid in the flexible pipe, to realize cleaning the automatic control of detached job.Chinese patent CN93209391.4 has introduced a kind of photoelectric sensor of measuring transparent liquid level in transparent container or the transparent pipeline, it is made up of a light-beam generator and a light beam Receiver, light beam is injected container in the mode that tilts, utilize the different refracting characteristics of light in different medium, reach the purpose of measuring liquid level.We once attempted directly to use commercially available low profile photovoltaic sensor or fiber optic probe with reference to this method, adopted directly outside mode of installing to detect.When correlation detected, because the external diameter of transparent hose is generally less, the light path of passing through fluid to be measured in the flexible pipe was shorter, made that the transmission contrast ratio of transparent hose of fluid to be measured and cutout is less; And the transmission light that reflection is passed through fluid to be measured when detecting is made that by the hose inner wall secondary reflection its reflected light contrast ratio with the transparent hose inwall of cutout is less; Be subject to surrounding environment light in the detection and disturb, be difficult to the detection that the interruption or the termination of high transparency liquid are determined; Because transparent hose very easily is out of shape, be difficult to convenient installing and locating accurately, light path should not be calibrated, and can not ensure reliable and stable detecting; The detection device volume is huge, installs and uses inconvenience.
Summary of the invention
In order to overcome the deficiency of existing detecting method, the fiber optic probe that the utility model provides a kind of novel detection transparency liquid to stop, this fiber optic probe is with optic fibre end, transparent connecting tube and fiber orientation seat integrate, only need transparent connecting tube is simply inserted the pipeline of carrying fluid to be measured, the other end of optical fiber links to each other with the fiber optic hub of Fiber Optic Amplifier, can be according to the refraction index changing of light in different medium, the method of utilizing reflection to detect, accurately be full of the transparency liquid or the slight change of air in the identification flexible pipe, reach the interruption of detection transparency liquid or the purpose of termination.
The technological scheme that its technical problem that solves the utility model adopts is: this fiber optic probe has the transparent connecting tube of flexible pipe socket by two optical fiber, two ends and the fiber orientation seat of fixed fiber termination and transparent connecting tube constitutes; The middle part of transparent connecting tube is fixed on the central authorities of fiber orientation seat, and the fiber orientation seat closely contacts with the tube wall of transparent connecting tube; The axes intersect of two optic fibre ends is an acute angle, is encapsulated in a side of transparent connecting tube in the fiber orientation seat, and is isolated mutually by opaque fiber orientation seat.
The working principle of this technological scheme is: flexible pipe is inserted at the two ends of transparent connecting tube, and the other end of optical fiber links to each other with the fiber optic hub of Fiber Optic Amplifier; When being full of transparency liquid in the flexible pipe, the emission light that sends by the light source of Fiber Optic Amplifier, be transferred to the emitting optical fiber head through emitting optical fiber, pass transparent connecting tube tube wall, enter the fluid to be measured in the pipe, and pass fluid to be measured, pass the opposite side tube wall once more, the transmission light quilt absorbs with the fiber orientation seat that tube wall closely contacts, and is subjected to the light optical fibre head can not receive emission light, the receiver no signal output of Fiber Optic Amplifier; When transparency liquid in the transparent connecting tube interrupts or stop, be full of air in the flexible pipe, the emission light that sends by the light source of Fiber Optic Amplifier, be transferred to the emitting optical fiber head through emitting optical fiber, enter transparent connecting tube tube wall, because the refractive index of pipe wall material is greater than the refractive index of inner air tube, emission light is in the reflection of formation at the interface of the inwall and the air of connecting tube, reflected light is turned back and is passed the connecting tube tube wall, receive by the contiguous light optical fibre head that is subjected to, receive light and stand the receiver of light Optical Fiber Transmission, output cutout signal to Fiber Optic Amplifier.
In above-mentioned fiber optic probe, the termination of two optical fiber is encapsulated on the plane of axis normal of fiber orientation seat center and transparent connecting tube, and the intersection point of two optical fiber beam center lines is positioned on the cambered surface of transparent connecting tube inwall or pipe.The angle of two light beams is by factors such as the distance decision to transparent connecting tube outer wall of the angle of flare of optical fiber beam, pipe thickness, optic fibre end.Because the beam spread angle of general optical fiber is approximately 40～60 °, so the optical fiber angle can reach effect preferably at 20～90 ° in the utility model.She Ji beam path makes emitting optical fiber not vertical with the cambered surface of transparent connecting tube outer wall like this, and the reflected light that shines outer wall surface does not directly enter and is subjected to light optical fiber, is subjected to light optical fiber mainly to accept reflected light from inner wall surface.
In order to have improved accuracy in detection, the reflective light intensity of transparent connecting tube inner wall surface weakens the secondary reflection light intensity that forms in transparent connecting tube outer wall surface when being full of transparency liquid when needing to increase cutout as far as possible.When the structural design of probe, manage the cross section of transparent connecting tube is become oblateness or ellipse by simple circle, make the transmitted light path that enters fluid to be measured not have a symmetry properties, then be effective method the most.Actual measurement shows: when the length diameter ratio after the cross section of transparent connecting tube becomes oblateness was 0.8～0.5, the secondary reflection light intensity can reduce about 20～50% in the transparent connecting tube of same circumference.Because this light path has effectively increased the contrast ratio of reflective light intensity and secondary reflection light intensity, has improved accuracy in detection, adopts the lower Fiber Optic Amplifier of commercially available resolution just can receive quite good detecting effectiveness like this.
In order to improve this fiber optic probe opposing surrounding environment light interference capability, on the fiber orientation seat, set up darkening ring, form incorporate shading setting sleeve.The cross section of shading setting sleeve endoporus is identical with the cross section of transparent connecting tube.She Ji sonde configuration makes the transparent connecting tube that detects on the light path axis closely contact with the shading setting sleeve like this, and the environment lighting that shines transparent connecting tube outer surface is difficult for directly injecting being subjected to the light optical fibre head.Can effectively weaken the interference of environment lighting like this, be subjected to the light optical fibre head mainly to accept the reflected light of transparent connecting tube inner wall surface.Actual test shows: for ensureing proper functioning under the condition of the non-direct projection of daylight, suitable darkening ring length is 1.5～4.0 times of transparent hose diameter.
In this fiber optic probe, optic fibre end is encapsulated in a side of transparent connecting tube in the fiber orientation seat, has guaranteed that the relative position of optic fibre end and transparent connecting tube is constant.Be easy-to-operat, the two ends of transparent connecting tube can have straight tube flexible pipe socket or corrugated flexible pipe socket, can install and change flexible pipe easily.Above-mentioned measure has guaranteed the Location accuracy of optical fibre head, helps improving measurement accuracy, and is required that accurate light path is installed when making original flexible pipe fixedly again, and becoming fixing following of light path needs simple flexible pipe plug-in mounting.
This fiber optic probe in light weight can directly be suspended in the hose line, and such fiber orientation seat can be the circular or oblate profile identical with the cross section of transparent connecting tube, need not reserve mounting hole; Fixing optical fiber probe can be reserved mounting hole on the fiber orientation seat for convenience; The fiber orientation seat also can be to have semicircular rectangle, reserves mounting hole at the arbitrary plane of rectangle; The fiber orientation seat also can have base, reserves mounting hole on the arbitrary plane of base.
Fiber orientation seat, darkening ring and the base of this fiber optic probe can select for use opaque engineering plastics, engineering ceramics, aluminum alloy or other metallic material to make, transparent connecting tube can be selected transparent PE, engineering plastics, polycarbonate (PC) for use, hard glass or other transparent materials are made, and optical fiber can be selected plastic optical fiber, glass optical fiber or the quartz glass optical fiber of band sheath for use.According to different applications, the optic fibre end that encapsulates or be fixed in the fiber orientation seat also can have annexes such as optical fiber protecting cover, protection camera lens, amasthenic lens, filter or eyeshade.
In general work temperature variation little (≤70 ℃), do not have and impact and require the flexible occasion of optical fiber, selecting the plastic optical fiber of band plastic sheath, the fiber orientation seat of opaque engineering plastics, the transparent connecting tube of PE for use then is the price performance optimal scheme.
The beneficial effects of the utility model are, effectively reduced the secondary reflection light intensity, weakened the interference of environment lighting, accuracy in detection and reliability have been ensured, and simple in structure, easy to use, cooperate the various Fiber Optic Amplifiers of choosing suitable light source, can effectively discern the interruption or the termination of different colours or colourless transparent liquid, be specially adapted to the less occasion of transparent hose external diameter.This fiber optic probe is simple in structure, and machine volume is little, can be applicable to multiple occasions such as Medical Instruments.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further described.
Fig. 1 is structural representation of the present utility model (cross section).
Fig. 2 is structural representation of the present utility model (longitudinal section).
Fig. 3 is the light path principle figure of the utility model when liquid is full of.
Fig. 4 is the light path principle figure of the utility model when liquid interrupts.
Fig. 5 is fiber optic probe first embodiment's a cross section tectonic maps.
Fig. 6 is fiber optic probe first embodiment's a longitudinal section tectonic maps.
Fig. 7 is fiber optic probe first embodiment's a elevation.
Fig. 8 is fiber optic probe second embodiment's a cross section tectonic maps.
Fig. 9 is fiber optic probe second embodiment's a profile.
Figure 10 is fiber optic probe the 3rd embodiment's a elevation.
Figure 11 is fiber optic probe the 3rd embodiment's a plan view.
1. Fiber Optic Amplifiers among the figure, 2. emitting optical fiber, 3. fiber orientation seat, 4. emitting optical fiber head, 5. fluid to be measured, 6. transparent connecting tube, 7. be subjected to the light optical fibre head, 8. be subjected to light optical fiber, 9. straight tube flexible pipe socket, 10. emission light, 11. receive light, 12. darkening rings, 13. mounting hole, 14. install screw, 15. optic fibre end annexes, 16. base, 17. corrugated flexible pipe sockets.
Embodiment
Structural representation of the present utility model is seen Fig. 1 and Fig. 2.This fiber optic probe is made of emitting optical fiber (2), the fiber orientation seat (3) that is subjected to light optical fiber (8), two ends to have the transparent connecting tube (6) of flexible pipe socket (9) and fixed fiber termination (4) (7) and transparent connecting tube (6); The middle part of transparent connecting tube (6) is fixed on the central authorities of fiber orientation seat (3), and fiber orientation seat (3) closely contacts with the tube wall of transparent connecting tube (6); The axes intersect of two optic fibre ends (4) (7) is arranged in a side of transparent connecting tube (6) for angle a, and is isolated mutually by opaque fiber orientation seat, is encapsulated on the plane of fiber orientation seat (3) center and transparent connecting tube (6) axis normal.
Fig. 3 and Fig. 4 have demonstrated the working principle of this scheme: when being full of transparency liquid in the transparent connecting tube (6), the emission light (10) that sends by the light source of Fiber Optic Amplifier (1), be transferred to emitting optical fiber head (4) through emitting optical fiber (2), pass transparent connecting tube (6) tube wall, enter the fluid to be measured (5) in the pipe, and pass fluid to be measured (5), pass the opposite side tube wall of transparent connecting tube (6) once more, the transmission light quilt absorbs with the fiber orientation seat (3) that tube wall closely contacts, received by light optical fibre head (7), the receiver no signal output of Fiber Optic Amplifier (1); When transparency liquid (5) in the transparent connecting tube (6) interrupts or stop, be full of air in the pipe, the emission light (10) that sends by the light source of Fiber Optic Amplifier (1), be transferred to emitting optical fiber head (4) through emitting optical fiber (2), enter the tube wall of transparent connecting tube (6), reflect at the inwall of connecting tube (6) and the formation at the interface of air, reflected light is turned back and is passed the tube wall of this side connecting tube (6), receive by the contiguous light optical fibre head (7) that is subjected to, receive light (11) and stand the receiver that light optical fiber (8) is transferred to Fiber Optic Amplifier (1), output cutout signal.
First embodiment:
In first embodiment shown in Fig. 5,6 and 7, this fiber optic probe by emitting optical fiber (2), be subjected to light optical fiber (8), two ends to have the oblate transparent connecting tube (6) of straight tube flexible pipe socket (9) and have darkening ring (12) and the oblate fiber orientation seat (3) of mounting hole (13) constitutes.Fiber orientation seat (3) and darkening ring (12) are made of opaque black engineering plastics ABS, and optical fiber (2) (8) is the plastic optical fiber of band black plastic sheath, and transparent connecting tube (6) adopts high clear PE pipe.The middle part of transparent connecting tube (6) is bonded in the central authorities of fiber orientation seat (3), and fiber orientation seat (3) closely contacts with the tube wall of transparent connecting tube (6); The axis of optic fibre end (4) (7) is on the plane that 50 angles are arranged in fiber orientation seat (3) center and transparent connecting tube (6) axis normal, is encapsulated in the below of transparent connecting tube (6), and is isolated mutually by opaque ABS.Fiber optic probe in the present embodiment, the length diameter ratio of its oblate transparent connecting tube (6) is 0.7, reduces about 30% in the circular transparent connecting tube of secondary reflection beam intensity ratio same circumference; The total length of darkening ring (12) is 4.0 times of transparent connecting tube (6) average diameter, can ensure proper functioning under the strong ambient light condition of periods of direct sunlight; Mounting hole (13) on fiber orientation seat (3) plane can make fiber optic probe be fixed on the horizontal stand easily, and can bear bigger external force.
Second embodiment:
In second embodiment shown in Fig. 8 and 9, semicircle rectangle optical fiber positioning seat (3) formation that this fiber optic probe has the emitting optical fiber (2) of attachment (15) by an end and is subjected to light optical fiber (8), two ends to have the circular transparent connecting tube (6) of corrugated flexible pipe socket (17) and has darkening ring (12) and screw (14) is installed.Fiber orientation seat (3) and darkening ring (12) are made of opaque black engineering plastics ABS, optical fiber (2) (8) is the plastic optical fiber of band black plastic sheath, optic fibre end annex (15) adopts makrolon material for the focusing lens of band protecting cover, transparent connecting tube (6).The middle part of transparent connecting tube (6) is bonded in the central authorities of fiber orientation seat (3), and fiber orientation seat (3) closely contacts with the tube wall of transparent connecting tube (6); The axis of optic fibre end (4) (7) is on the plane that 60 angles are arranged in fiber orientation seat (3) center and transparent connecting tube (6) axis normal, is encapsulated in the below of transparent connecting tube (6), and is isolated mutually by opaque ABS.Fiber optic probe in the present embodiment, the total length of its darkening ring (12) are 3.0 times of transparent connecting tube (6) diameter, can ensure proper functioning under the strong ambient light condition of the non-direct projection of daylight; Installation screw (14) on fiber orientation seat (3) bottom surface can make fiber optic probe be fixed on easily on vertical support frame or the vertical panel.
The 3rd embodiment:
In the 3rd embodiment shown in Figure 10 and 11, this fiber optic probe is by emitting optical fiber (2) and be subjected to light optical fiber (8), two ends to have the oblate transparent connecting tube (6) of corrugated flexible pipe socket (17) and have darkening ring (12) and the semicircle rectangle optical fiber positioning seat (3) of mounting base (16) constitutes; Fiber orientation seat (3), darkening ring (12) and mounting base (16) are made of opaque grey engineering plastics ABS, and optical fiber (2) (8) is the plastic optical fiber of band black plastic sheath, and transparent connecting tube (6) adopts makrolon material.The middle part of transparent connecting tube (6) is bonded in the central authorities of fiber orientation seat (3), and fiber orientation seat (3) closely contacts with the tube wall of transparent connecting tube (6); The axis of optic fibre end (4) (7) is on the plane that 50 angles are arranged in fiber orientation seat (3) center and transparent connecting tube (6) axis normal, is encapsulated in the below of transparent connecting tube (6), and is isolated mutually by opaque ABS.Fiber optic probe in the present embodiment, the length diameter ratio of its oblate transparent connecting tube (6) is 0.6, reduces about 40% in the circular transparent connecting tube of secondary reflection beam intensity ratio same circumference; The total length of darkening ring (12) is 3.0 times of transparent connecting tube (6) diameter, can ensure proper functioning under the strong ambient light condition of the non-direct projection of daylight; Mounting hole (13) on the mounting base (16) can make fiber optic probe be fixed on easily on vertical support frame or the vertical panel, and can bear bigger external force.
Claims (6)
1. one kind is detected the fiber optic probe that transparency liquid stops, comprise emitting optical fiber (2), be subjected to light optical fiber (8) and structure of fiber_optic, one end of optical fiber is fixed on the outside of the transparent pipeline of carrying fluid to be measured (5), the other end of optical fiber links to each other with the fiber optic hub of Fiber Optic Amplifier (1), it is characterized in that: described fiber optic probe by emitting optical fiber (2), constituted by light optical fiber (8), transparent connecting tube (6) and fiber orientation seat (3); The intermediate portion of described transparent connecting tube (6) is arranged on the central authorities of fiber orientation seat (3), and its two ends are connected with the pipeline of carrying fluid to be measured (5); Described emitting optical fiber (2) and be subjected to the mutual isolation of light optical fiber (8) and a side that optic fibre end (4) that axes intersect is acute angle and (7) are arranged on transparent connecting tube (6) in the fiber orientation seat (3).
2. fiber optic probe according to claim 1 is characterized in that: isolation and axes intersect are the optic fibre end (4) (7) of acute angle mutually, are encapsulated on the plane of fiber orientation seat (3) center and transparent connecting tube (6) axis normal.
3. fiber optic probe according to claim 1 is characterized in that: have the transparent connecting tube (6) of circle, oblateness or plurality of stepped serrations, two ends can have straight tube flexible pipe socket (9) or corrugated flexible pipe socket (17).
4. fiber optic probe according to claim 1 is characterized in that: both sides have the fiber orientation seat (3) of cylindrical shape, oblate tubular or oval cylinder darkening ring (12).
5. fiber optic probe according to claim 1 is characterized in that: fiber orientation seat (3) has mounting hole (13) or screw (14) is installed or is had mounting base (16).
6. fiber optic probe according to claim 1 is characterized in that: can have attachment (15) on the optic fibre end (4) (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200555170U CN201166261Y (en) | 2008-02-18 | 2008-02-18 | Optical fiber probe for detecting transparent liquid cutoff |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200555170U CN201166261Y (en) | 2008-02-18 | 2008-02-18 | Optical fiber probe for detecting transparent liquid cutoff |
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| Publication Number | Publication Date |
|---|---|
| CN201166261Y true CN201166261Y (en) | 2008-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008200555170U Expired - Fee Related CN201166261Y (en) | 2008-02-18 | 2008-02-18 | Optical fiber probe for detecting transparent liquid cutoff |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579319A (en) * | 2019-10-08 | 2019-12-17 | 中北大学 | Optical fiber sensor for detecting liquid leakage based on quasi-distributed mode and detection method |
| CN113982565A (en) * | 2021-10-27 | 2022-01-28 | 中国地质科学院勘探技术研究所 | Device and method for identifying mud liquid level based on correlation optical fiber type turbidity sensor |
-
2008
- 2008-02-18 CN CNU2008200555170U patent/CN201166261Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579319A (en) * | 2019-10-08 | 2019-12-17 | 中北大学 | Optical fiber sensor for detecting liquid leakage based on quasi-distributed mode and detection method |
| CN113982565A (en) * | 2021-10-27 | 2022-01-28 | 中国地质科学院勘探技术研究所 | Device and method for identifying mud liquid level based on correlation optical fiber type turbidity sensor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Lu Jianxiang Document name: Notification to Pay the Fees |
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| DD01 | Delivery of document by public notice |
Addressee: Lu Jianxiang Document name: Notification of Termination of Patent Right |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081217 Termination date: 20110218 |