CN201828277U - Reflective optical fiber sensor device - Google Patents
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- CN201828277U CN201828277U CN2010205380625U CN201020538062U CN201828277U CN 201828277 U CN201828277 U CN 201828277U CN 2010205380625 U CN2010205380625 U CN 2010205380625U CN 201020538062 U CN201020538062 U CN 201020538062U CN 201828277 U CN201828277 U CN 201828277U
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Abstract
The utility model discloses a reflective optical fiber sensor device, which comprises a light source, a light detector and a sensor probe, wherein the sensor probe receives incident light emitted by the light source, and after the incident light is processed, the obtained reflected light is sent to the light detector. The reflective optical fiber sensor device can overcome the defects that the reflective optical sensor device in the prior art has larger volume, can not be used in an environment with electromagnetic interference, has a shorter service life and poor corrosion resistance and the like so as to realize the advantages of small volume, wide application range, long service life and good corrosion resistance.
Description
Technical field
The utility model relates to sensor, particularly, relates to a kind of reflection-type optical fibre sensor device.
Background technology
Along with the develop rapidly of science and technology and improving constantly of people's living standard, people must be by means of sense organ in order to obtain information from the external world; And depend merely on people's self sense organ, their function is just much of that far from research spontaneous phenomenon and rule and activity in production; For adapting to this situation, sensor arises at the historic moment.
Extraneous signal, physical condition (as light, heat, humidity) or chemical composition (as smog) can be surveyed, be experienced to a kind of physical unit of sensor or biologic-organ, and convert thereof into the device of the output signal of of the same race or other kind of character according to certain rules; Can be applied in fire-fighting, machinery and every field such as building, its inner structure is that change size of current such as the quantity, size, area by coil reaches the effect of wanting.
At present, sensor is penetrated into already such as the extremely general field of commercial production, space development, hydrospace detection, environmental protection, resource exploration, medical diagnosis, bioengineering even historical relic's protection or the like.Can not rant out, from boundless and indistinct space, to the vast oceans, so that various complex engineering system, almost each modernized project all be unable to do without various sensors.
By the principle of work classification, sensor can be divided into: what (1) physical sensors was used is physical influence, such as piezoelectric effect, and magneto-striction phenomenon, effects such as ionization, polarization, thermoelectricity, photoelectricity, magnetoelectricity, the subtle change of measured signal amount all will convert electric signal to; (2) chemical sensor comprises that those are causal sensor with phenomenons such as chemisorption, electrochemical reactions, and the subtle change of measured signal amount also will convert electric signal to; (3) some sensor can not be divided into the physics class, can not be divided into chemical classes.Most of sensors are the basis running with the physical principle; The chemical sensor technical matters is more, integrity problem for example, and the possibility of large-scale production, price problems etc. have solved this class difficult problem, and the application of chemical sensor will have tremendous growth.
Classification by use, sensor can be divided into: the quick and force-sensing sensor of pressure, position transducer, level sensor, energy consumption sensor, speed pickup, acceleration transducer, ray radiation sensors heat sensitive sensor etc.In addition, sensor can also be by form, technology, the row classification of output signal.
The static characteristics of sensor is meant the input signal to static state, has mutual relationship between the output quantity of sensor and the input quantity.Because at this moment input quantity and output quantity are all irrelevant with the time, so relation between them, the static characteristics that is sensor can be with an algebraic equation that does not contain time variable, or makes horizontal ordinate with input quantity, the output quantity corresponding with it is made ordinate and the family curve that draws is described; The major parameter that characterizes Sensor's Static characteristic has: the linearity, sensitivity, sluggishness, repeatability, drift etc.
Sensor dynamic characteristic is meant sensor when input changes, the characteristic of its output.In real work, the dynamic perfromance of sensor is used it always the response of some standard input signal is represented.This is because sensor is tried to achieve with experimental technique easily to the response of standard input signal, and it has often known that to having certain relation between the response of standard input signal and its response to arbitrary input the former just can infer the latter.The most common standard input signal has two kinds of step signal and sinusoidal signals, so the dynamic perfromance of sensor step response also commonly used and frequency response are represented.
In realizing process of the present utility model, the inventor finds sensor of the prior art, exist at least volume environment, serviceable life big, that can not be used to have electromagnetic interference (EMI) short with defectives such as corrosion resistance is relatively poor.
Summary of the invention
The purpose of this utility model is, at the problems referred to above, proposes a kind of reflection-type optical fibre sensor device, with realize that volume is little, applied widely, the advantage of long service life and good corrosion resistance.
For achieving the above object, the technical solution adopted in the utility model is: a kind of reflection-type optical fibre sensor device, comprise light source, photo-detector and sensor probe, and wherein: described sensor probe receives the incident light that light source sends, after treatment, the reflected light that obtains is sent to photo-detector.
Further, in the inside of described sensor probe, be packaged with at least one single-mode fiber and the root multimode fiber that be arranged in parallel; Wherein: described single-mode fiber is connected with light source, and multimode optical fiber is connected with photo-detector.
Further, when described multimode optical fiber is two or two when above, the number of described photo-detector and the radical of multimode optical fiber are complementary, and every root multimode fiber is connected with corresponding photo-detector.
Further, when described multimode optical fiber is two or two when above, also comprise fiber coupler; Described two or two above multimode optical fibers by the fiber coupler coupling after, be connected with photo-detector.
Further, described light source comprises LED and laser instrument.
Further, described laser instrument comprises that model is the Distributed Feedback Laser of 1550nm.
The reflection-type optical fibre sensor device of each embodiment of the utility model, owing to comprise light source, photo-detector and sensor probe, wherein: sensor probe receives the incident light that light source sends, and after treatment, the reflected light that obtains is sent to photo-detector; Owing to adopt sensor probe, can imbed in the various objects under test, the structure of object under test there is not influence, be not subjected to various electromagnetic interference (EMI) on every side, under the situation of strong electromagnetic, still can work, so use occasion to be many, serviceable life is long; Thereby can overcome volume in prior art environment, serviceable life big, that can not be used to have electromagnetic interference (EMI) short with the relatively poor defective of decay resistance, with realize that volume is little, applied widely, the advantage of long service life and good corrosion resistance.
Other features and advantages of the utility model will be set forth in the following description, and, partly from instructions, become apparent, perhaps understand by implementing the utility model.The purpose of this utility model and other advantages can realize and obtain by specifically noted structure in the instructions of being write, claims and accompanying drawing.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Accompanying drawing is used to provide further understanding of the present utility model, and constitutes the part of instructions, is used from explanation the utility model with embodiment one of the present utility model, does not constitute restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation one according to the utility model reflection-type optical fibre sensor device;
Fig. 2 is the structural representation two according to the utility model reflection-type optical fibre sensor device;
Fig. 3 is the theoretical model synoptic diagram according to the utility model reflection-type optical fibre sensor device;
Fig. 4 is the reflective power computation process synoptic diagram according to multimode optical fiber in the utility model reflection-type optical fibre sensor device;
Fig. 5 is the distance and powertrace synoptic diagram according to the utility model reflection-type optical fibre sensor device;
Fig. 6 is the structural representation according to the sensor that is used to measure fatigue, material surface roughness and corrosion in the utility model reflection-type optical fibre sensor device;
Fig. 7 is the structural representation according to pressure transducer in the utility model reflection-type optical fibre sensor device;
Fig. 8 is distance and powertrace synoptic diagram according to the sensor that is used to measure corrosion in the utility model reflection-type optical fibre sensor device;
Fig. 9 is light intensity and distance Curve synoptic diagram according to the sensor that is used to measure the stainless steel metal surfaceness in the utility model reflection-type optical fibre sensor device;
Figure 10 is the distance and powertrace synoptic diagram according to reflecting body and fiber end face in the utility model reflection-type optical fibre sensor device;
Figure 11 is the structural representation according to sensor probe xsect in the utility model reflection-type optical fibre sensor device;
Figure 12 is the light channel structure synoptic diagram that is connected with photo-detector by fiber coupler according to many root multimode fibers in the utility model reflection-type optical fibre sensor device;
Figure 13 is the light channel structure synoptic diagram that connects with corresponding photo-detector respectively according to many root multimode fibers in the utility model reflection-type optical fibre sensor device.
In conjunction with the accompanying drawings, Reference numeral is as follows among the utility model embodiment:
The 1-light source; The 11-DFB laser instrument; The 2-sensor probe; The 3-photo-detector; 31-first photo-detector; 32-second photo-detector; The 41-single-mode fiber; 42-is dual mode optical fiber more than first; 43-is dual mode optical fiber more than second; The 5-reflecting body; The 6-fiber coupler; 7-connects support.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the utility model, and be not used in qualification the utility model.
According to the utility model embodiment, provide a kind of reflection-type optical fibre sensor device.As Fig. 1-shown in Figure 13, present embodiment comprises light source 1, photo-detector 3 and sensor probe 2, and wherein: sensor probe 2 receives the incident light that light sources 1 send, and after treatment, the reflected light that obtains is sent to photo-detector 3.
Further, in the above-described embodiments,, be packaged with the single-mode fiber (as single-mode fiber 41) and at least one root multimode fiber that be arranged in parallel in the inside of sensor probe 2; Wherein: single-mode fiber 41 is as input optical fibre, be connected with light source 1, and multimode optical fiber is as output optical fibre, be connected with photo-detector 3.Here, because fibre diameter is thinner, so probe volume is very little, can imbed in the various objects under test, and the structure of this object is not had influence; Adopt optical fiber, be not subjected to various electromagnetic interference (EMI) on every side, under the situation of strong electromagnetic, still can work, so use occasion is many; And the serviceable life of optical fiber is long, can reach more than 30 years.
For example,, the single-mode fiber 41 and first multimode optical fiber 42 that be arranged in parallel be can be packaged with, the single-mode fiber 41, first multimode optical fiber 42 and second multimode optical fiber 43 that be arranged in parallel also can be packaged with in the inside of sensor probe 2.
Here, when multimode optical fiber is two or two when above, the number of photo-detector 3 can be complementary with the radical of multimode optical fiber, and every root multimode fiber is connected with corresponding photo-detector 3; For example, first multimode optical fiber 42 is connected with first photo-detector 31, and second multimode optical fiber 43 is connected with second photo-detector 32.
In addition, after multimode optical fiber is two or two when above, can also comprises that 6, two of fiber couplers or two above multimode optical fibers are by fiber coupler 5 couplings, be connected with photo-detector 3 again; For example, first multimode optical fiber 42 and second multimode optical fiber 43 are connected with photo-detector 3 after being coupled by fiber coupler 6 again.
In the above-described embodiments, light source 1 can be LED, also can be laser instrument; Usually select the laser instrument of single longitudinal mode for use, going up the most frequently used model such as communication is the distributed feedback laser (being Distributed Feedback Laser 11) of 1550nm.Here, the tail optical fiber of Distributed Feedback Laser 11 and single-mode fiber 41 link together by the optical fiber splicer welding; One end of first multimode optical fiber 42 and the tail optical fiber of photo-detector 3 link together by welding.If select LED to make light source, because its tail optical fiber is a multimode optical fiber, then incident optical also must be selected multimode optical fiber for use, so that its coupling; Since laser instrument the curve of spectrum, performance number size, and aspect such as power stability all be better than LED, therefore in most cases select laser instrument, and do not select LED to make light source as light source.
Particularly, as depicted in figs. 1 and 2, sensor probe 2 can be made up of the optical fiber of two parallel placements, and an optical fiber is single-mode fiber 41, and another root optical fiber is first multimode optical fiber 42.Here, single-mode fiber 41 core diameters are 10um, and cladding diameter is 125um; It is the optical fiber of 50um or 62.5um that first multimode optical fiber 42 is selected common core diameter usually, and its cladding diameter is 125um; Receive the light signal that reflects in order to increase, optical fiber also can be selected the bigger multimode optical fiber of core diameter, is the multimode optical fiber of 100um such as core diameter, even bigger also passable; Light signal is propagated in fiber core fully.
Single-mode fiber 41 is consistent with the tail optical fiber type of Distributed Feedback Laser 11, and in the time of can making two fused fiber splices, splice loss, splice attenuation drops to minimum, and the light that light source is sent shines on the reflecting body as much as possible; The fibre core of multimode optical fiber is thicker, can receive the more light signal that reflects from reflecting body.
The single-mode fiber 41 and first multimode optical fiber 42 are selected appropriate length, handle two fiber end faces well end face by the fiber cut cutter or with optic fiber polishing machine, it is parallel that to put into a length be 30mm, diameter is in the stainless steel sleeve pipe of 3mm, then to stainless steel sleeve pipe injection ring epoxy resins, after waiting for resin solidification, can be with the optical fiber fixed position, and play the effect of sealing; If necessary, sensor probe 2 can grind with the optical fiber pouncing paper.According to actual needs, the probe size of Fibre Optical Sensor can change, and its length can be longer, also can shorten; It is littler that diameter can be done, and minimum can arrive 250um, only holds two optical fiber and put together side by side.
Photo-detector 3 can be a PIN p n junction photodiode, and it is at the 1550nm place, and responsiveness is greater than 0.8A/W.In the above-described embodiments, testee can be used as reflecting body 5; The tail optical fiber of photo-detector 3 and multimode optical fiber welding, the laser from reflecting body 5 reflects through the transmission of first multimode optical fiber 42, is received by photo-detector 3.
For example, the light that sends from light source 1, by being coupled into single-mode fiber 41, shine then on the reflecting body 5, produce scatterings on reflecting body 5 surface, have part light to be reflected to enter an end of first multimode optical fiber, 42, the first multimode optical fibers 42 to connect photo-detector 3, reflection enters the light of first multimode optical fiber 42, will be coupled into photo-detector 3; By the luminous power size that photo-detector 3 receives, can learn that the reflection coefficient on reflecting body 5 surfaces changes, perhaps reflecting body 5 is to the variation of corresponding optical fiber end face distance.
But in some occasion, during such as stress or temperature test, reflecting body 5 must be packaged together with sensor probe 2, constitutes a sensing head, as the part of reflection-type optical fibre sensor, is an integral body.Single-mode fiber 41 is as input optical fibre, and first multimode optical fiber 42 is as output optical fibre; The light that light source 1 sends is coupled into single-mode fiber 41, is mapped on the reflecting body 5, produces reflection, and the light of reflection is coupled into first multimode optical fiber 42, is received by photo-detector 3.
Here, as the reflecting body 5 of reflected light signal, be detected object sometimes; Sometimes need to be packaged together, constitute a sensing head, as the indispensable part of sensor, during as stress or temperature test with sensor probe 2.As seen, testee is reflecting body 5 not necessarily, and for example: when test stress and temperature, reflecting body 5 is packaged together with sensor probe 2, constitutes sensing head, test be the pressure size that ambient temperature or testee bear; Measure fatigue of materials, the material surface roughness, during corrosion, testee separates with sensor probe 2 as reflecting body 5.
If the surface reflectance of reflecting body 5 does not change, and the distance of fiber end face and reflecting body 5 changes, the luminous power that photo-detector 3 receives also will change, and according to the luminous power size that receives, can infer the distance of reflecting body 5 and fiber end face; If keep the distance of fiber end face and reflecting body 5 constant, the reflection coefficient on reflecting body 5 surfaces according to the luminous power size that photo-detector 3 receives, can be learnt the variation of the surface reflectance of reflecting body 5 owing to the influence of environment changes.
Because the fibre core of optical fiber is thinner, light weight, volume is little, be not subjected to electromagnetic interference (EMI), corrosion-resistant, the life-span is long, therefore the reflection-type optical fibre sensor device of the foregoing description also can be imbedded in the various objects under test, be used for material stress, fatigue, the monitoring of aspects such as material surface roughness, corrosion and temperature.
The different purposes of the foregoing description reflection-type optical fibre sensor device can be distinguished according to testee; For example: when measuring stress and temperature, sensor probe 2 must be packaged together with reflecting body 5; Measure fatigue of materials, when material surface roughness and corrosion, testee separates with sensor probe 2 as reflecting body 5.
In Fig. 3, d is the distance of fiber end face to reflecting body 5.In single-mode fiber 41, the light distribution Gaussian distributed; Angle of divergence θ is the numerical aperture of optical fiber, when laser shines reflecting body 5 from input optical fibre, forms a light cone.When a branch of directional light shines desirable minute surface, reflected light will be a branch of directional light also, be called direct reflection; If shine hackly when surface, light will to all the winds reflect, and is called diffuse reflection; For the object of majority and general metal surface, the light of generation all diffuses; The reflection of light law is all observed in direct reflection and diffuse reflection.For most body surfaces, naked eyes seem, as very smooth, but observe under magnifier, and its surface is by a lot of rough little surface compositions, so its reflected light also will be to diffuse.
The light that light source sends shines on the reflecting body through single-mode fiber, has part light to be reflected to the end face that receives optical fiber then, is coupled into multimode optical fiber.The fibre core area of multimode optical fiber is big more, and the light signal that is coupled into multimode optical fiber is many more.Therefore, use the multimode optical fiber of big core diameter, can fully receive the light signal that reflects.Because:
In formula (1), W is a beam radius, and r is a radius, and I0 is largest light intensity (can referring to Fig. 4).
In Fig. 4, R0 is the distance between single-mode fiber and the multimode optical fiber fibre core, and a2 is the multimode optical fiber fiber core radius, and r is a dash area.
Because dP=∫ d φ ∫ Irdr, then the reflected optical power P of multimode optical fiber reception:
In formula (2), d is the distance of fiber end face to reflecting body, and a is the fiber core radius of multimode optical fiber.
In Fig. 5, ordinate is the output power of sensor from multimode optical fiber, and horizontal ordinate is the distance of fiber end face to reflecting body; The curve that curve A obtains for experiment, curve B is the theoretical curve that analog computation obtains.In this simulation,, can suppose that reflector surface is smooth fully in order to obtain perfect relation curve.
In Fig. 6, the reflection-type optical fibre sensor device can be used for measuring tired, and the material surface roughness also can be used for measuring corrosion.First optical fiber (being single-mode fiber 42) receives the light that light source 1 sends; The light that second optical fiber (i.e. first multimode optical fiber 42) reception is returned from the surface reflection of reflecting body 5; Photo-detector 3 receives the light signal that reflects.According to the luminous power size that photo-detector 3 receives, can obtain the situation of fatigue, material surface roughness and the corrosion variation of object reflector 5.
When carrying out the fatigue measurement, because reflecting body 5 opposite sides bear certain pressure usually, reflecting body 5 is closely to contact with the object that gives its acting force; And the multimode optical fiber end face remains unchanged to the distance of reflecting body 5.Under long-time stressed situation, the micromechanism of reflecting body 5 will change, and therefore impels reflector surface also will produce micro-variations (such as surfaceness); Its surperficial changing condition is associated with the acting force that applies, and its fatigue period is associated.Because reflecting body 5 surfaces change, its surface reflectance also will change, and the luminous power that photo-detector receives also will change; According to the relation of above parameter, fatigue state that can monitoring object.
Measure the material surface roughness with tired measuring method unanimity, the multimode optical fiber end face remains unchanged to the distance of reflector surface, and the reflection coefficient of reflector surface since a variety of causes change, such as steel in the annealing front and back.
In Fig. 9, reflecting body is a stainless steel, and sensor probe is 0-4mm to the distance on steel surface, and stainless steel surfaces grinds through the sand paper of 4 kinds of variable grains, obtains the stainless steel surfaces of four kinds of different roughness.Monitor its surfaceness with Fibre Optical Sensor, can obtain E, H, four curves of F, D.
When the reflection-type optical fibre sensor device was used for corrosion measurement, this reflection-type optical fibre sensor device was directly to be placed in the test environment; Because corrosion generally is from object surfaces,, thereby can produce a hole on the top layer then slowly to the endosexine infiltration.Because fiber end face apart from d variation has taken place to reflecting surface, and because corrosion, variation has also taken place in the reflectivity of reflector surface, and therefore the luminous power that reflects also will change.In Fig. 9, because the aggravation of reflector surface corrosion, the degree of depth in hole and area all can strengthen, and the luminous power that photo-detector receives also will produce bigger variation; The optical power value that receives according to photo-detector, corrosion situation that can the monitoring object surface.
In Fig. 7, the reflection-type optical fibre sensor device is a pressure transducer, and during gaging pressure, the sensor reflecting body also closely contacts with the target that gives its acting force; Connect support 7 and play a part to connect reflecting body 5 and sensor probe 2, constitute a device that is similar to piston; Reflecting body 5 can be selected soft reflectance coating for use, closely contacts with the object that gives its acting force.When carrying out pressure sensing when measuring, if sensor probe is fixed, after reflecting body is subjected to extraneous acting force, will produce displacement, will change to the end face distance of mirror based fiber optica, thereby the luminous power of detector reception is changed.According to luminous power, shift length and apply relation between the acting force three can obtain the size of the acting force that reflecting body bears.
Unlike traditional fiber-optic pressure sensor instrument, acting force is on optical fiber; The reflection-type optical fibre sensor device is according to the variable in distance of fiber end face to a reflecting body, and causes receiving the variation of optical fiber luminous power, comes gaging pressure; And optical fiber itself does not bear pressure, can well protect optical fiber like this, improves the reliability and the serviceable life of sensor.
In Fig. 7, if reflecting body 5 is replaced by thermally sensitive metal material, just can be used for monitor temperature, as temperature sensor; Select the big metal of thermal expansivity, its phenomenon of expanding with heat and contract with cold is apparent in view.When temperature variation, metal is owing to expand or shrinkage, and metallic reflection face will change to the distance of fiber end face, and the luminous power that photo-detector receives also will change.According to the original depth of chaff, fiber end face is to the variable in distance value of metallic reflection face, and the optical power value that photo-detector receives and the thermal expansivity K of metal material can obtain temperature value by calculating.
In Figure 10, reflecting body is 2.5mm to the maximum to the distance of fiber end face; Clearly, locate at preceding half section (0-0.5mm), along with the increase of fiber end face to the distance of reflecting body, the output power of Fibre Optical Sensor slowly increases, when the 0.5mm place, and the luminous power maximum that photo-detector is surveyed; (0.5mm-2.5mm) locates in the second half section, and along with the increase of fiber end face to the distance of reflecting body, the output power of Fibre Optical Sensor slowly reduces, when distance 2.5mm, and the output power minimum of sensor, the luminous power minimum of photo-detector detection at that time.Know that by Figure 10 we have two operation windows to select, i.e. two wave bands of 0～0.5mm and 0.5mm～2.5mm.Obviously,, set up corresponding relation, by signal Processing, can be used for monitoring pressure, environment temperature, object corrosion etc. if we get wherein linear relationship wave band (can referring to arrow indication zone among Figure 10) preferably.
Because the probe of Fibre Optical Sensor is very thin, length is the shortest even can reach several millimeters, and therefore diameter can, can be embedded in the object to be measured, and this object is had no effect easily less than 1mm.And because optical fiber is very thin, one or more pairs of optical fiber can be packaged together, and make a plurality of sensor probes, by the reflection of a plurality of differences, come the performance change of monitoring objective.By statistical calculating, come target of prediction contingent variation in the future.
In order fully to receive the light signal that reflects from reflecting body, can encapsulate many parallel multimode optical fibers (referring to Figure 11) around single-mode fiber in the stainless-steel pipe of sensor probe, the catoptrical multimode optical fiber of reception is increased to more than two or two.In the sensor probe of Figure 11, A, B, C are multimode optical fiber, and D is a single-mode fiber, and the multimode optical fiber uniform ring is around single-mode fiber, and dash area is the fibre core of optical fiber.
Multimode optical fiber is connected with photo-detector by fiber coupler, and light channel structure can be referring to Figure 12; Perhaps every root multimode fiber is connected with photo-detector separately, and light channel structure can be referring to Figure 13.In Figure 12, the reflection-type optical fibre sensor device can improve the luminous power that enters photo-detector, and sensor can be operated in more under the rugged environment, prolongs the serviceable life of sensor; In Figure 13, the reflection-type optical fibre sensor device can increase area and detection sampled point that sensor is surveyed, can improve the precision of measuring like this; Use above two kinds of structured optical fiber sensors, big meaning is also arranged for the reliability aspect that improves sensor measurement.
The reflection-type optical fibre sensor device of the foregoing description, probe adopt stainless-steel tube, the optical fiber of at least two parallel placements of encapsulation in the steel pipe, and it is little to have a volume, good airproof performance, advantages such as anti-electromagnetic interference (EMI), and be easy to processing, realize easily; Can be widely used in fatigue of materials, stress, the detection of aspects such as material surface roughness, corrosion and temperature has good market outlook.
In sum, the reflection-type optical fibre sensor device of each embodiment of the utility model, owing to comprise light source, photo-detector and sensor probe, wherein: sensor probe receives the incident light that light source sends, after treatment, the reflected light that obtains is sent to photo-detector; Owing to adopt sensor probe, can imbed in the various objects under test, the structure of object under test there is not influence, be not subjected to various electromagnetic interference (EMI) on every side, under the situation of strong electromagnetic, still can work, so use occasion to be many, serviceable life is long; Thereby can overcome volume in prior art environment, serviceable life big, that can not be used to have electromagnetic interference (EMI) short with the relatively poor defective of decay resistance, with realize that volume is little, applied widely, the advantage of long service life and good corrosion resistance.
It should be noted that at last: the above only is preferred embodiment of the present utility model, be not limited to the utility model, although the utility model is had been described in detail with reference to previous embodiment, for a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (6)
1. a reflection-type optical fibre sensor device is characterized in that, comprises light source, photo-detector and sensor probe, and wherein: described sensor probe receives the incident light that light source sends, and after treatment, the reflected light that obtains is sent to photo-detector.
2. reflection-type optical fibre sensor device according to claim 1 is characterized in that, in the inside of described sensor probe, is packaged with the single-mode fiber and at least one root multimode fiber that be arranged in parallel; Wherein: described single-mode fiber is connected with light source, and multimode optical fiber is connected with photo-detector.
3. reflection-type optical fibre sensor device according to claim 2, it is characterized in that, when described multimode optical fiber is two or two when above, the number of described photo-detector and the radical of multimode optical fiber are complementary, and every root multimode fiber is connected with corresponding photo-detector.
4. reflection-type optical fibre sensor device according to claim 2 is characterized in that, when described multimode optical fiber is two or two when above, also comprises fiber coupler; Described two or two above multimode optical fibers by the fiber coupler coupling after, be connected with photo-detector.
5. according to each described reflection-type optical fibre sensor device among the claim 1-4, it is characterized in that described light source comprises LED and laser instrument.
6. reflection-type optical fibre sensor device according to claim 5 is characterized in that, described laser instrument comprises that model is the Distributed Feedback Laser of 1550nm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410850A (en) * | 2010-09-21 | 2012-04-11 | 王建伟 | Reflective optical fiber sensor device |
| CN103048002A (en) * | 2011-10-14 | 2013-04-17 | 无锡阿斯特科技有限公司 | Reflective optical fiber sensor device |
| CN103047934A (en) * | 2011-10-14 | 2013-04-17 | 无锡阿斯特科技有限公司 | Optical fiber sensing microspur measurement system |
| CN108195774A (en) * | 2018-02-27 | 2018-06-22 | 无锡迅杰光远科技有限公司 | A kind of light source for spectrum analysis emits and signal collection system |
-
2010
- 2010-09-21 CN CN2010205380625U patent/CN201828277U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410850A (en) * | 2010-09-21 | 2012-04-11 | 王建伟 | Reflective optical fiber sensor device |
| CN103048002A (en) * | 2011-10-14 | 2013-04-17 | 无锡阿斯特科技有限公司 | Reflective optical fiber sensor device |
| CN103047934A (en) * | 2011-10-14 | 2013-04-17 | 无锡阿斯特科技有限公司 | Optical fiber sensing microspur measurement system |
| CN108195774A (en) * | 2018-02-27 | 2018-06-22 | 无锡迅杰光远科技有限公司 | A kind of light source for spectrum analysis emits and signal collection system |
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