CN105136336B - A kind of optical fiber air ring cavity temperature sensor based on femto-second laser - Google Patents
A kind of optical fiber air ring cavity temperature sensor based on femto-second laser Download PDFInfo
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- CN105136336B CN105136336B CN201510217598.4A CN201510217598A CN105136336B CN 105136336 B CN105136336 B CN 105136336B CN 201510217598 A CN201510217598 A CN 201510217598A CN 105136336 B CN105136336 B CN 105136336B
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- optical fiber
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Abstract
The present invention provides a kind of optical fiber air ring cavity temperature sensor based on femto-second laser, it is characterised in that：It is made of incident optical (1), air ring cavity configuration (2), the output optical fiber (3)；The both ends of air ring cavity configuration (2) are connected with incident optical (1) and the output optical fiber (3) respectively；Incident optical (1) collectively forms all -fiber Mach-Zehnder interferometer with air ring cavity configuration (2) with the output optical fiber (3)；High sensitivity of the present invention, structure is small, can be applied in various pyrometric Practical Projects.
Description
Technical field
The present invention provides the optical fiber air ring cavity temperature sensors based on femto-second laser, belong to optical fiber sensing technology neck
Domain.
Background technology
Mach-Zehnder interferometer is widely used in sensory field, it is made with two-beam interference principle.It passes
The Mach-Zehnder interferometer of system needs the identical single mode optical fiber of two root long degree, other than the physical quantity for needing to measure it is easy by
Such as influence of other physical quantitys of humidity.It can be seen that traditional Mach-Zehnder interferometer makes difficulty.Then, all -fiber horse
Conspicuous Zehnder interferometer is suggested.Current all -fiber Mach-Zehnder interferometer is mainly based upon FBG, LPFG, PCF, and optical fiber is drawn
Vertebra, the structures such as optical fiber dislocation connection are constituted, although sensitivity is very high, the temperature sensing of these Mach-Zehnder interferometers composition
Device size is big, is not easy to reuse.More than solving the problems, such as, a kind of novel all -fiber Mach-Zehnder interferometer is carried
Go out, the making of this temperature sensor has used femto-second laser, femto-second laser to be used for accurate micro-nano technology, it with object
, it can be achieved that ultrahigh resolution, superhigh precision, to reach the processing and manufacturing of nanoscale when matter interacts.This all -fiber
Mach-Zehnder interferometer have many advantages, such as that high sensitivity, structure are small.
Air ring cavity configuration in optical fiber air ring cavity temperature sensor based on femto-second laser makes original only in fibre
The light transmitted in core is transmitted and is interfered in the form of core mode and air ring cavity mold respectively.When the use sensor pair
When ambient temperature measures, changing temperature every time can all make interference fringe drift about.This is because air ring cavity mold
It is different to the responsiveness of temperature change with core mode, it changes so as to cause original optical path difference.With changing for optical path difference
Become, interference fringe will change.After temperature passes through a series of variation, you can be observed therewith on spectrometer
Corresponding a series of interference fringe.In certain feature locations of interference fringe, such as interference peaks or interference paddy, it can be seen that
The wavelength that extreme value is located at drifts about, and the drift value by monitoring interference spectrum may be implemented temperature and measure.
Invention content
The purpose of the present invention is to provide a kind of optical fiber air ring cavity temperature sensor based on femto-second laser.The device
It can will wait for that the variable quantity of testing temperature is converted into the wavelength shift of detectable signal.With high sensitivity, structure is small, is easy to weight
The advantages that using again.
The invention is realized by the following technical scheme：
A kind of optical fiber air ring cavity temperature sensor based on femto-second laser, by incident optical (1), air ring cavity configuration
(2), the output optical fiber (3) forms；The both ends of air ring cavity configuration (2) are connected with incident optical (1) and the output optical fiber (3) respectively
It connects；Incident optical (1) and air ring cavity configuration (2) collectively form all -fiber Mach-Zehnder interferometer with the output optical fiber (3).
A kind of optical fiber air ring cavity temperature sensor based on femto-second laser, it is characterised in that：Incident optical
(1), G.652 single mode optical fiber can be used in the output optical fiber (3), and incident optical (1) and the output optical fiber (5) length are 20~40cm.
A kind of optical fiber air ring cavity temperature sensor based on femto-second laser, it is characterised in that：Air ring cavity
Optical fiber used in structure (2) is that G.652 single mode optical fiber can be used, and length is 50um~100um, air ring cavity configuration (2)
Ring cavity exradius is 4um~7um, and inner circle radius is 2um~5um.
The present invention operation principle be：When the light that wideband light source is sent out reaches air ring cavity by incident optical, due to
The core diameter of incident optical is thicker than the core diameter of this section of optical fiber of air ring cavity configuration.It is transmitted in fibre core originally in this way
Light is divided into two parts, some light enters in air ring cavity, and another part light will continue on fibre core transmission, empty when reaching
When compression ring cavity configuration terminal, the light transmitted in air ring cavity will be interfered with the light transmitted in fibre core, finally by going out
It penetrates optical fiber and reaches spectrometer.
The light wherein transmitted between fibre core and air ring cavity is interfered, briefly, between fibre core and air ring cavity
Interference can be obtained with known formula：
Wherein IcoreAnd IcavityIt is the light intensity that light is spread out of from fibre core and air ring cavity configuration respectively, λ is incident light wave
Long, L is the length of air ring cavity,It is that effective refractive index between core mode and air ring cavity mold is poor,It is
The initial phase of interference.Since L is constant, then the formula of the temperature control of this Mach-Zehnder interferometer is
WhereinWithIt is the temperature coefficient of fibre core and air dielectric refractive index respectively, it is different
At a temperature of the effective refractive index of air ring cavity remain unchanged, therefore the temperature coefficient of fiber core refractive index determines a Mach Zeng Degan
The temperature control of interferometer.
When being measured to ambient temperature using the sensor, change ambient temperature every time, due to air ring cavity mold and
Core mode is different to the responsiveness of temperature so that air ring cavity mold and the optical path difference of core mode change, to change
Phase difference between air ring cavity mold and core mode, interference fringe are drifted about, can by monitoring interference spectrum wavelength shift
To restore measured signal.
The beneficial effects of the invention are as follows：The temperature sensor be based on connect in air ring cavity configuration Mach-Zehnder interference
What instrument was made.The light transmitted in fibre core is divided into two parts, and a part of light enters air ring cavity, and another part light will continue
Transmitted along the fibre core of scaling loss, when reaching air ring cavity configuration terminal, the light that is transmitted in air ring cavity will in fibre core
The light of transmission interferes.When changing the ambient temperature of sensor, corresponding interference spectrum will drift about.The sensor uses
The Mach-Zehnder interferometer of interior company, stability is more preferable, sensitivity higher, and is not easily susceptible to the influence of extraneous variations in refractive index.
Description of the drawings
Fig. 1 is the optical fiber air ring cavity temperature sensor schematic diagram based on femto-second laser of the present invention；
Specific implementation mode
Below in conjunction with the accompanying drawings and embodiment the invention will be further described：
Referring to attached drawing 1, a kind of optical fiber air ring cavity temperature sensor based on femto-second laser, by incident optical (1), sky
Compression ring cavity configuration (2), the output optical fiber (3) composition；The both ends of air ring cavity configuration (2) respectively with incident optical (1) and emergent light
Fine (3) are connected；Incident optical (1) constitutes all -fiber Mach-Zahnder interference with air ring cavity configuration (2) and the output optical fiber (3)
Instrument.The manufacturing process of air ring cavity configuration (2) is as follows：It is punched in fiber end face with femto-second laser, laser facula is straight
Diameter is transferred to 2um or so, makes a call to a circle aperture along fibre core in covering, has intersection between each aperture.Adjust femtosecond laser simultaneously
The intensity and focus point distance of device are to control the depth of aperture.Therefore, annular air chamber is formed at fibre core and cladding interface.
After having beaten hole, since the inner surface of annular air chamber is not smooth enough, then HF is used to corrode optical fiber, keeps it smooth.It then will be empty
The end face of compression ring cavity configuration (2) is connected with incident optical (1) and the output optical fiber (3) respectively.
The working method of apparatus of the present invention is：Wideband light source, another termination spectrometer are terminated by the one of temperature sensor.When
When the light that wideband light source is sent out reaches air ring cavity configuration through incident optical, the light transmitted in fibre core originally is divided into two
Point, a part enters air ring cavity, and another part light will continue on fibre core transmission, when reaching air ring cavity configuration terminal,
The light propagated in air ring cavity will be interfered with the light transmitted in scaling loss fibre core.When the ambient temperature for changing sensor
When, corresponding interference spectrum will drift about, so as to obtain the sensitivity of the sensor.
Claims (3)
1. a kind of optical fiber air ring cavity temperature sensor based on femto-second laser, by incident optical (1), air ring cavity configuration
(2), the output optical fiber (3) forms；The both ends of air ring cavity configuration (2) are connected with incident optical (1) and the output optical fiber (3) respectively
It connects；Incident optical (1) collectively forms all -fiber Mach-Zehnder interferometer with air ring cavity configuration (2) with the output optical fiber (3)；It is special
Sign is that air ring cavity configuration (2) is to make a call to a circle aperture along fibre core in the covering of single mode optical fiber end face with femto-second laser,
There is intersection between each aperture, while adjusting the depth of the intensity and focus point distance control aperture of femto-second laser, it is ensured that is fine
Core forms annular air chamber with covering circle intersection, reuses hydrofluoric acid corrosion annular air chamber, makes its smooth surface, and will
Fibre core attenuates.
2. a kind of optical fiber air ring cavity temperature sensor based on femto-second laser according to claim 1, feature exist
In：G.652 single mode optical fiber, incident optical (1) and the output optical fiber (3) length can be used in incident optical (1), the output optical fiber (3)
For 20~40cm.
3. a kind of optical fiber air ring cavity temperature sensor based on femto-second laser according to claim 1, feature exist
In：G.652 single mode optical fiber can be used in optical fiber used in air ring cavity configuration (2), and length is 50um~100um, air ring cavity
The ring cavity exradius of structure (2) is 4um~7um, and inner circle radius is 2um~5um.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510217598.4A CN105136336B (en) | 2015-04-30 | 2015-04-30 | A kind of optical fiber air ring cavity temperature sensor based on femto-second laser |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510217598.4A CN105136336B (en) | 2015-04-30 | 2015-04-30 | A kind of optical fiber air ring cavity temperature sensor based on femto-second laser |
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| CN105136336A CN105136336A (en) | 2015-12-09 |
| CN105136336B true CN105136336B (en) | 2018-08-24 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106959172B (en) * | 2017-03-23 | 2019-09-24 | 重庆大学 | Highly sensitive compact M-Z interference temperature sensor and preparation method thereof |
| CN109297519B (en) * | 2018-11-01 | 2021-06-18 | 中国计量大学 | Temperature and strain simultaneous detection system based on cascade optical fiber and internal microcavity structure |
| CN110514233B (en) * | 2019-10-10 | 2024-04-26 | 中国计量大学 | Mach-Zehnder interferometer on cavity suspension channel type optical fiber line |
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| US7466424B2 (en) * | 2004-11-17 | 2008-12-16 | Ramot At Tel Aviv University Ltd. | Displacement sensor based on photonic crystal waveguides |
| US8548282B2 (en) * | 2011-01-21 | 2013-10-01 | The Hong Kong Polytechnic University | Fiber in-line Mach-Zehnder interferometer (MZI) device |
| CN103217124B (en) * | 2013-03-20 | 2016-04-13 | 华中科技大学 | A kind of Fibre Optical Sensor based on Mach-Zahnder interference |
| CN104215270A (en) * | 2013-05-31 | 2014-12-17 | 中自高科（苏州）光电有限公司 | All-fiber sensor machined by femtosecond laser pulse sequence and production method of all-fiber sensor |
| CN103345020B (en) * | 2013-07-10 | 2016-03-30 | 北京交通大学 | Based on the Mach-Zehnder interferometer of three core fibres |
| CN204944701U (en) * | 2015-04-30 | 2016-01-06 | 中国计量学院 | A kind of optical fiber air ring cavity temperature sensor based on femto-second laser |
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Non-Patent Citations (1)
| Title |
|---|
| Ultracompact Intrinsic Micro Air-Cavity Fiber Mach–Zehnder Interferometer;Minkyu Park 等;《IEEE Photonics Technology Letters》;20090801;第21卷(第15期);正文第1027页右栏最后一段-第1028页左栏倒数第二段 * |
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