CN217932165U - Flexible micro-nano optical fiber coupler and micro-strain sensing application system - Google Patents
Flexible micro-nano optical fiber coupler and micro-strain sensing application system Download PDFInfo
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- CN217932165U CN217932165U CN202221977813.2U CN202221977813U CN217932165U CN 217932165 U CN217932165 U CN 217932165U CN 202221977813 U CN202221977813 U CN 202221977813U CN 217932165 U CN217932165 U CN 217932165U
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Abstract
The utility model discloses an optical fiber coupler and microstrain sensing application system are received to flexibility, wherein optical fiber coupler is received to flexibility, include: the middle part of the first quartz optical fiber is subjected to fused tapering to form a first tapered region; the middle part of the second quartz optical fiber is fused and tapered to form a second taper region; the coupling region is an optical fiber which is connected with the first taper region and the second taper region; and the packaging unit is a flexible transparent organic elastomer film and is used for packaging part of the first quartz optical fiber, the first conical region, the coupling region, the second conical region and part of the second quartz optical fiber. The utility model discloses the monitoring of meeting an emergency is carried out to spectral effect based on the beam split ratio, has fine anti external disturbance ability, but the change of monitoring cycle and loss has both guaranteed sensitivity and has enlarged sensing range simultaneously. The utility model discloses but wide application in optical fiber sensor technical field.
Description
Technical Field
The utility model relates to an optical fiber sensor technical field especially relates to a flexible optical fiber coupler and microstrain sensing application system of receiving a little.
Background
The flexible device has excellent folding and wearable performances and has important application in the fields of physiological monitoring, soft robots, bioelectricity, flexible displays, intelligent clothing and the like. The flexible strain sensor can measure environmental strain and mechanical deformation in the bending motion process in real time in situ, and becomes flexible equipment essential to the fields of human health monitoring and the like. To track the extremely weak strain signals in cardiovascular disease, blood flow, skin tissue healing and acoustic vibrations, it has become imperative to improve the sensitivity and detection limit of flexible strain sensors. These advanced sensors will more easily capture the details of changes in human physiological indicators and provide more effective data support for drug development, clinical diagnosis and disease treatment.
The electronic flexible sensor achieves excellent performance in the aspect of identifying extremely weak strain sensing signals by measuring changes of capacitance, resistance, piezoelectricity and triboelectricity. However, problems of parasitic effects, insufficient insulation, and electromagnetic interference have limited practical applications of electronic sensors to some extent.
The optical sensor, especially the optical fiber sensor, has the obvious advantages of high sensitivity, high precision, fast response speed, inherent electrical safety, strong anti-electromagnetic interference capability and the like, and provides a promising substitute for the electronic sensor. Most of optical fiber sensors monitor the change of strain by monitoring the change of power, wherein the sensor for monitoring strain is realized by using the principle of loss, and the sensitivity is mainly bending loss caused by structural distortion caused by external stress or increased loss caused by doping light-absorbing substances in the optical fiber. Such sensors have limited sensitivity and compactness compared to conventional electronic sensors.Another sensor based on interference effect measures strain by using an interference method in a traditional quartz optical fiber, and the sensitivity detection limit of the sensor is in a sub-p epsilon level (10) –11 %) which provides great potential for improving the sensitivity and detection limit of the optical fiber strain sensor. However, the unpackaged sensor is easily polluted by the external environment, the service life of the sensor is influenced, the sensor is easily interfered by external micro vibration during sensing, the detection result is inaccurate, the sensitivity is too high, and the detection range is limited.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model aims at providing a flexible optical fiber coupler and microstrain sensing application system are received a little.
The utility model adopts the technical proposal that:
a flexible micro-nano optical fiber coupler comprises:
the middle part of the first quartz optical fiber is subjected to fused tapering to form a first tapered region;
the middle part of the second quartz optical fiber is fused and tapered to form a second taper region;
the coupling region is an optical fiber which is connected with the first taper region and the second taper region;
the packaging unit is a flexible transparent organic elastomer film and is used for packaging part of the first quartz optical fiber, the first conical area, the coupling area, the second conical area and part of the second quartz optical fiber;
the first end of the first quartz optical fiber is used as the input end of the flexible micro-nano optical fiber coupler; and two ends of the second quartz optical fiber are used as output ends of the flexible micro-nano optical fiber coupler.
Further, the diameter of the optical fiber on the coupling area is 0.5-25 μm, and the length is 0.1-20mm.
Further, the thickness of the packaging unit is 20-1000 μm.
The utility model discloses another technical scheme who adopts is:
a micro-strain sensing application system comprising:
the flexible micro-nano optical fiber coupler is described above;
the narrow-band light source is connected with the input end of the flexible micro-nano optical fiber coupler;
the input ends of the two photoelectric detectors are correspondingly connected with the two output ends of the flexible micro-nano optical fiber coupler;
the output ends of the two photoelectric detectors are connected to the multi-channel data acquisition card;
and the upper computer is connected with the multi-channel data acquisition card and is used for demodulating the received signals.
Further, the micro strain sensing application system comprises a single-point detection system and an array detection system;
the single-point detection system corresponds to one flexible micro-nano optical fiber coupler and uses 2 photoelectric detectors; the array detection system corresponds to a plurality of flexible micro-nano optical fiber couplers, and the different points are positioned and monitored by combining an optical switch time division multiplexing technology and a photoelectric detector.
The beneficial effects of the utility model are that: the utility model discloses the monitoring that the beam split effect carries out meeting an emergency based on the beam split ratio has fine anti external disturbance ability, can monitor the change of cycle and loss simultaneously, has both guaranteed sensitivity and has enlarged sensing range again.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a microstrain sensing application system according to an embodiment of the present invention;
FIG. 2 is a graph showing the relationship between strain and change in coupling ratio of the flexible micro-nano fiber coupler according to the embodiment of the present invention;
fig. 3 is a schematic diagram of the micro-vibration of the micro-nano fiber coupler driven by the sound generated by the sound vibration in the embodiment of the present invention;
FIG. 4 is a graph showing the wrist pulse test chart according to the embodiment of the present invention;
FIG. 5 is a graph of the throat sound test and the frequency response in an embodiment of the present invention;
reference numbers of fig. 1: 1. a narrow band light source; 2. a silica optical fiber; 3. a conical zone; 4. a coupling region; 5. a photodetector; 6. a multi-channel data acquisition card; 7. an upper computer; 8. and (7) packaging the unit.
Detailed Description
This section will describe in detail the embodiments of the present invention, the preferred embodiments of which are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can visually and vividly understand each technical feature and the whole technical solution of the present invention, but it cannot be understood as a limitation to the scope of the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of meanings are one or more, a plurality of meanings are two or more, and the terms greater than, smaller than, exceeding, etc. are understood as excluding the number, and the terms greater than, lower than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the terms in the present invention by combining the specific contents of the technical solution.
As shown in fig. 1, the embodiment provides a flexible micro-nano fiber coupler, and a preparation method of the flexible micro-nano fiber coupler includes preparation and packaging of the micro-nano fiber coupler. As an alternative embodiment, the micro-nano fiber coupler can be prepared by the following steps: firstly, two silica fibers with coating layers removed are wiped and fixed on a tapering platform by dust-free paper and are manufactured by melting tapering, the micro-nano fiber coupler consists of a coupling area 4, a tapering area 3 and a silica fiber 2, the silica fiber 2 is connected with the tapering area 3, and the thinnest part between the tapering areas 3 at two ends is the coupling area 4. And (3) packaging: the flexible transparent organic elastomer film is prepared by heating a precursor of the flexible transparent organic elastomer film.
As shown in fig. 1, the present embodiment provides a micro-strain sensing application system including a sensing device and a signal demodulating part. The sensing device comprises a flexible micro-nano optical fiber coupler, a narrow-band light source 1, two photoelectric detectors 5 and a multi-channel data acquisition card 6; the signal demodulation section includes an upper computer 7. The flexible micro-nano optical fiber coupler comprises a coupling area 4, a cone area 3 and a quartz optical fiber 2. One input port of the flexible micro-nano optical fiber coupler is connected to the narrow-band light source 1, the other two output ports are respectively connected to the two photoelectric detectors 5, the two photoelectric detectors 5 are connected to a multi-channel data acquisition card 6, the multi-channel data acquisition card 6 is connected with an upper computer 7 through a USB communication interface, and signals are demodulated by utilizing a signal processing unit in the upper computer 7.
Further as an alternative embodiment, the microstrain sensing application system comprises a single-point detection system and an array detection system; the single-point detection system corresponds to one flexible micro-nano optical fiber coupler and uses 2 photoelectric detectors; the array detection system corresponds to a plurality of flexible micro-nano optical fiber couplers, and the different points are positioned and monitored by combining an optical switch time division multiplexing technology and a photoelectric detector.
As a further optional implementation, the upper computer performs signal demodulation in the following manner:
obtaining splitting ratios under different strain conditions by using the splitting effect of a coupling area of the flexible micro-nano optical fiber coupler, and performing normalization processing on the splitting ratios to obtain model data;
when the micro-strain sensing application system is applied, a strain detection result is output according to the model data and the obtained splitting ratio.
As a further optional implementation manner, the upper computer performs signal demodulation, and further includes:
and simultaneously detecting the change of strain and loss, wherein the change of optical power can be caused when the flexible micro-nano optical fiber coupler is stretched, the ratio of the sum of the optical power of two output ports of the flexible micro-nano optical fiber coupler to the input optical power is a loss numerical value, and the periodic site is searched according to the loss numerical value.
The micro strain sensing application system is explained in detail with reference to specific embodiments.
A flexible micro-nano optical fiber coupler with the radius of 1 micrometer and the length of 18mm in a coupling area is selected and fixed on a high-precision displacement platform, one end of the flexible micro-nano optical fiber coupler is connected with a narrow-band light source 1, the other two output ports of the flexible micro-nano optical fiber coupler are connected with two photoelectric detectors 5, the photoelectric detectors 5 are connected with a multi-channel data acquisition card 6, the multi-channel data acquisition card 6 is connected with an upper computer 7 through a USB communication interface, and a signal processing unit 7 in the upper computer 7 is used for demodulating signals to achieve the effect of monitoring strain. The flexible micro-nano optical fiber coupler is stretched through a stepping motor, as shown in fig. 2, fig. 2 is a graph of the relation between strain and coupling ratio change of a sensing unit of the stretched flexible micro-nano optical fiber coupler.
The connection mode is the same as that described above, the flexible micro-nano optical fiber coupler with the radius of the coupling area of 1 μm and the length of 18mm is placed on a high-precision displacement table and fixed, a sound box is placed near the sensing unit of the flexible micro-nano optical fiber coupler, the sound generated by the sound box vibration drives the micro-vibration of the micro-nano optical fiber coupler, so that the sound box plays a single-frequency signal from 20Hz to 20kHz, and the flexible micro-nano optical fiber coupler can detect the change of different frequencies, as shown in fig. 3.
The flexible micro-nano optical fiber coupler sensing units with the diameter of 1 micrometer and the length of 18mm are attached to different parts of a human body or integrated in a wearable device, and the specific connection method is the same as that described above. The flexible micro-nano optical fiber coupler sensing unit is attached to the wrist part, the pulse beat of the wrist is tested, and the obtained relation curve graph is shown in fig. 4. The sensor has good response to the vibration of the pulse, and can clearly measure the pulse of the wrist. Meanwhile, the flexible micro-nano optical fiber coupler sensing unit is attached to the throat, the sound drives the vocal cords to vibrate, words of S, C, U and T are spoken respectively, and the change of the splitting ratio can be clearly seen, as shown in fig. 5.
In summary, compared with the prior art, the embodiment has the following advantages and beneficial effects:
(1) The light power is monitored by utilizing the change of the splitting ratio, so that the high sensitivity is realized, the very low detection limit is reached, and meanwhile, the interference of the external environment is easily eliminated.
(2) Meanwhile, the change of the period and the loss is monitored, and the site splitting ratio on the period is positioned by using the loss, so that the high sensitivity is ensured, and the sensing range is expanded.
(3) The micro-nano optical fiber coupler is packaged by the flexible transparent organic elastomer, so that the stability of the micro-nano optical fiber coupler is improved, and the micro-nano optical fiber coupler is prevented from being interfered by dust, impurities and the like.
(4) The utility model discloses the change of the sensor of preparation through 10000 times repeated tensile experiments back light splitting ratio is still very stable, explains that this sensor can carry out long-term use.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (5)
1. A flexible micro-nano optical fiber coupler is characterized by comprising:
the middle part of the first quartz optical fiber is fused and tapered to form a first tapered region;
the middle part of the second quartz optical fiber is fused and tapered to form a second taper region;
the coupling region is an optical fiber which is connected with the first taper region and the second taper region;
the packaging unit is a flexible transparent organic elastomer film and is used for packaging part of the first quartz optical fiber, the first conical area, the coupling area, the second conical area and part of the second quartz optical fiber;
the first end of the first quartz optical fiber is used as the input end of the flexible micro-nano optical fiber coupler; and two ends of the second quartz optical fiber are used as output ends of the flexible micro-nano optical fiber coupler.
2. The flexible micro-nano optical fiber coupler according to claim 1, wherein the diameter of the optical fiber on the coupling region is 0.5-25 μm, and the length is 0.1-20mm.
3. The flexible micro-nano optical fiber coupler according to claim 1, wherein the thickness of the packaging unit is 20-1000 μm.
4. A micro-strain sensing application, comprising:
the flexible micro-nano fiber coupler of claim 1;
the narrow-band light source is connected with the input end of the flexible micro-nano optical fiber coupler;
the input ends of the two photoelectric detectors are correspondingly connected with the two output ends of the flexible micro-nano optical fiber coupler;
the output ends of the two photoelectric detectors are connected to the multi-channel data acquisition card;
and the upper computer is connected with the multi-channel data acquisition card and is used for demodulating the received signals.
5. The microstrain sensing application system of claim 4, wherein said microstrain sensing application system comprises a single point detection system and an array detection system;
the single-point detection system corresponds to one flexible micro-nano optical fiber coupler and uses 2 photoelectric detectors; the array detection system corresponds to a plurality of flexible micro-nano optical fiber couplers, and the different points are positioned and monitored by combining an optical switch time division multiplexing technology and a photoelectric detector.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115308842A (en) * | 2022-07-28 | 2022-11-08 | 华南理工大学 | Flexible micro-nano optical fiber coupler, micro-strain sensing application system and preparation method |
| CN117433677A (en) * | 2023-12-18 | 2024-01-23 | 之江实验室 | Method and device for detecting stress position of micro-nano optical fiber cone region based on spectral change |
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2022
- 2022-07-28 CN CN202221977813.2U patent/CN217932165U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115308842A (en) * | 2022-07-28 | 2022-11-08 | 华南理工大学 | Flexible micro-nano optical fiber coupler, micro-strain sensing application system and preparation method |
| CN115308842B (en) * | 2022-07-28 | 2024-02-13 | 华南理工大学 | Flexible micro-nano optical fiber coupler, micro-strain sensing application system and preparation method |
| CN117433677A (en) * | 2023-12-18 | 2024-01-23 | 之江实验室 | Method and device for detecting stress position of micro-nano optical fiber cone region based on spectral change |
| CN117433677B (en) * | 2023-12-18 | 2024-04-19 | 之江实验室 | Method and device for detecting stress position of micro-nano optical fiber cone region based on spectral change |
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