CN107101805B - Hollow polarization-maintaining photonic crystal fiber Verdet constant measuring apparatus and method - Google Patents
Hollow polarization-maintaining photonic crystal fiber Verdet constant measuring apparatus and method Download PDFInfo
- Publication number
- CN107101805B CN107101805B CN201710263584.5A CN201710263584A CN107101805B CN 107101805 B CN107101805 B CN 107101805B CN 201710263584 A CN201710263584 A CN 201710263584A CN 107101805 B CN107101805 B CN 107101805B
- Authority
- CN
- China
- Prior art keywords
- photonic crystal
- coupling
- waveguide
- polarization
- fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The invention discloses a kind of hollow polarization-maintaining photonic crystal fiber Verdet constant measuring apparatus and method, device includes light source, Y waveguide, testing fiber (hollow polarization-maintaining photonic crystal fiber), detector, electromagnet, DC power supply, field-effect tube, signal generator, lock-in amplifier, one-dimensional automatically controlled displacement platform.Method includes several steps, rapid one, welding testing fiber；Step 2: applying modulation magnetic field；Step 3: keeping testing fiber precision mobile；Step 4: calculating Verdet constant according to demodulation value；Apparatus of the present invention are simple, and measurement sensitivity is high；Universality of the invention is good, can theoretically extend to the measurement of any polarization maintaining optical fibre Verdet constant.
Description
Technical field
The invention belongs to fiber optic applications technical fields, and in particular to a kind of based on the hollow polarization-maintaining photon for coupling time wave interference
The measuring device and method of crystal optical fibre Verdet constant (Verdet constant).
Background technique
Optical fibre gyro is as a kind of extremely rapid novel inertia angular-rate sensor is developed, with its distinctive technology and property
Energy advantage, as structure of whole solid state, high reliablity, service life are long；Starting speed is fast, and the response time is short；Measurement range is big, dynamic range
It is wide；Shock resistance, vibration, it is resistant to chemical etching；It is small in size, light weight and cost is low；It is suitble to mass production etc., is widely used for
Each field.General optical fibre gyro form is to realize SAGNAC interferometer using a set of optical path in the world, by respectively according to suitable
Interference between hour hands (CW), the two beams main wave train that (CCW) is propagated counterclockwise resolves SAGNAC phase shift caused by carrier rotation.
Although this interferometer structure is simple, with the continuous extension of optical fibre gyro application field, volume, weight and precision it
Between contradiction become increasingly conspicuous, with existing technology, under the premise of maintaining certain size and volume, further increase optical fibre gyro
Precision be difficult.
However the birefringent height of hollow polarization-maintaining photonic crystal fiber, the precision of optical fibre gyro can be improved.Polarization-maintaining photonic crystal
Usually it is asymmetrically formed that geometry is birefringent by the structure of homogenous material, about 2 quantity lower than traditional fiber to the sensibility of temperature
Grade, can be improved the temperature performance of gyro.Hollow polarization-maintaining photonic crystal fiber bending loss is low, it is easy to accomplish gyro miniaturization.
Traditional fiber is easily revealed when bending radius is smaller, limits the miniaturization of optical fibre gyro.And polarization-maintaining photonic crystal bend
Loss ratio traditional fiber is much smaller, facilitates fiber optic loop miniaturization.Thus using hollow polarization-maintaining photonic crystal fiber for optical fiber
The promotion of gyro performance is extremely important.
Hollow polarization-maintaining photonic crystal fiber possesses preferable polarization-maintaining ability, to the interference that extraneous environmental change generates have compared with
Good inhibition, such as temperature, magnetic field.Therefore it has a very wide range of applications in optical-fibre communications and sensory field.Although hollow is protected
The magnetic susceptibility of polarisation photonic crystal fiber is very weak, but when it is applied to optical fibre gyro, magnetic field, which is still one, to neglect
Depending on influence factor.Magnetic field can make optical fibre gyro generate additional biasing, so there is still a need for accurate measurement hollow polarization-maintaining light
The Verdet constant of photonic crystal fiber, so as to guide the magnetic susceptibility of control optical fiber.The original substantially of optical fiber V erdet constant measurement
Reason is Faraday magnetooptical effect.The rotation angle of magneto-optic effectIt is directly proportional to applied field strengths B, it is worn in the medium with light
The distance L crossed is directly proportional while related with δ, and relationship isWherein VeffIt is equivalent Verdet
Constant, and V is the Verdet constant for the optical fiber of being measured.
The Verdet constant measurement scheme of optical fiber is divided into monochromatic light road measurement method mainly for traditional single mode optical fiber at present
With double-optical path method.In the mensuration of monochromatic light road, the light that light source issues first passes through a polarizer, subsequently into magnetic field
Coupling point finally enters detector via analyzer, at 45 ° between peak response analyzer and the polarizer to guarantee, passes through
The light intensity after adding magnetic field is detected to calculate Verdet constant.Double-optical path scheme is on the basis of monochromatic light drive test amount by analyzing
Device is changed to polarization beam apparatus (PBS), and the polarised light transmitted in magnet-optical medium can be divided into direction of vibration and is mutually perpendicular to by PBS, is passed
Broadcast direction two-beam in a certain angle.This two-beam is received by two detectors respectively, then " difference is removed to two paths of signals progress
With " processing, Verdet constant is calculated by processing result.If considering the influence of linear birefrigence, Faraday magnetooptical effect expression
Formula should be expressed as For coefficient caused by linear birefrigence, for traditional single-mode optics
Fibre is low birefringent fiber, and linear birefrigence can be ignored, and δ influences very little,About 1, therefore its is equivalent
Verdet constant is larger, it is easy to test, its Verdet constant can be measured by above method.And for hollow polarization-maintaining photon
Crystal optical fibre, linear birefrigence are affected, and δ is affected,General very little cannot be ignored, therefore equivalent
Verdet constant very little is difficult to be measured with above method.It is therefore proposed that new measuring device and method becomes to measure sky
The key of core polarization-maintaining photonic crystal fiber magnetic susceptibility.
Summary of the invention
The purpose of the present invention is to solve the above problems, propose a kind of based on the hollow polarization-maintaining photon for coupling time wave interference
The measuring device and method of crystal optical fibre Verdet constant.
A kind of measurement dress based on the hollow polarization-maintaining photonic crystal fiber Verdet constant for coupling time wave interference of the invention
It sets, including light source, Y waveguide, testing fiber (hollow polarization-maintaining photonic crystal fiber), detector, electromagnet, DC power supply, field effect
Ying Guan, signal generator, lock-in amplifier, one-dimensional automatically controlled displacement platform.
A kind of measurement side based on the hollow polarization-maintaining photonic crystal fiber Verdet constant for coupling time wave interference of the invention
Method, specifically includes the following steps:
Step 1: with certain to shaft angle degree welding testing fiber；
Welding is distinguished on two Y waveguide tail optical fibers to shaft angle degree with certain in the both ends of testing fiber.
Step 2: applying modulation magnetic field；
Apply the modulation magnetic field of certain frequency in the position close to fusion point.
Step 3: keeping testing fiber precision mobile；
Testing fiber is fixed on one-dimensional automatically controlled displacement platform, displacement platform dragging optical fiber is made to do equidistant micro-displacement,
And the demodulation value of lock-in amplifier is recorded in real time.
Step 4: calculating Verdet constant according to demodulation value；
According to the demodulation value of lock-in amplifier the peak-to-peak value near fusing point is found, by the anti-testing fiber that pushes away of peak-to-peak value
Verdet constant.
The present invention has the advantages that
(1) apparatus of the present invention are simple, and measurement sensitivity is high；
(2) universality of the invention is good, can theoretically extend to the measurement of any polarization maintaining optical fibre Verdet constant.
Detailed description of the invention
Fig. 1 is a kind of measuring device schematic diagram of hollow polarization-maintaining photonic crystal fiber Verdet constant of the present invention；
Fig. 2 is magnetic direction schematic diagram；
Fig. 3 (a) (b) is the measurement result figure of hollow polarization-maintaining photonic crystal fiber；
In figure:
1- light source 2-Y waveguide A 3- Coupling point A
4- fusion point B 5- hollow polarization-maintaining photonic crystal fiber 6- electromagnet
7- fusion point C 8- Coupling point D 9-Y waveguide B
The one-dimensional automatically controlled displacement of 10- detector 11- signal generator 12-
13- lock-in amplifier
Specific embodiment
Below in conjunction with drawings and examples, the present invention is described in further detail.
The present invention is a kind of hollow polarization-maintaining photonic crystal fiber Verdet constant measuring apparatus based on coupling time wave interference,
For measuring the magnetic susceptibility of optical fiber.Measuring device is as shown in Figure 1, include light source 1, Y waveguide A2, hollow polarization-maintaining photonic crystal light
Fibre 5, electromagnet 6, Y waveguide B9, detector 10, signal generator 11, one-dimensional automatically controlled displacement platform 12 and lock-in amplifier 13.
Light source 1 uses high-power ASE light source, and the light that light source issues becomes line polarisation after Y waveguide A2 and enters hollow guarantor
Polarisation photonic crystal fiber 5, Coupling point A3 is the chip of Y waveguide A2 and the Coupling point of tail optical fiber, if coupling angle is θ1, light coupling
The coupling subwave generated at point A3 is W1.The tail optical fiber of hollow polarization-maintaining photonic crystal fiber 5 and Y waveguide A2 are with certain to shaft angle degree
θ2Welding is carried out, fusion point B4 is formed, the coupling subwave of generation is W2, the light into hollow polarization-maintaining photonic crystal fiber 5 passing through
When electromagnet 6, since polarization cross coupling can occur for the effect in magnetic field, the coupling subwave of generation is Wm.Subsequent light is passing through
Cross and reach detector 10 after Y waveguide B9, the tail optical fiber of hollow polarization-maintaining photonic crystal fiber 5 and Y waveguide B9 with 90 ° to shaft angle degree into
Row welding makes Y waveguide B9 serve as the function of analyzer, forms fusion point C7, and the coupling subwave of generation is W3.Same Coupling point
D8 is the chip of Y waveguide A2 and the Coupling point of tail optical fiber, if coupling angle is θ4, the coupling subwave of generation is W4.Finally reach detection
The coupling subwave of device 10 is W1, W2, Wm, W3And W4.Signal generator 11 is modulated the magnetic field of electromagnet 6, and detector 10 is visited
The modulated signal of the signal modulated and signal generator 11 that measure all is transferred to lock-in amplifier 13.One-dimensional automatically controlled displacement platform
12 dragging hollow polarization-maintaining photonic crystal fibers 5 do accurate displacement, while the demodulation of the record variation of lock-in amplifier 13.
Based on above measuring device, the present invention provides a kind of based on the hollow polarization-maintaining photonic crystal light for coupling time wave interference
Fine Verdet constant measurement method, specifically includes the following steps:
Step 1: with certain to shaft angle degree welding testing fiber；
As shown in Figure 1, first by hollow polarization-maintaining photonic crystal fiber 5 with certain to axis angle, θ2It is fused to Y waveguide A2
On, θ2Selection should be analyzed according to following situations: light can be due to axis angle, θ at fusion point B42Generate polarization cross coupling
It closes, winner's wave is made to generate polarization state perpendicular to the coupling subwave W of main wave2, W2It is useful signal.To axis angle, θ2In a certain range
It is inside bigger, W2Intensity it is bigger, the signal that detector detects is also stronger therefore should make to axis angle, θ2It is big as far as possible.But
W2Intensity it is excessive when will lead to detector 10 saturation, thus make detector 10 fail.Therefore θ2Selection should meet will not lead
It is big as far as possible under the premise of causing detector 10 to be saturated.Hollow polarization-maintaining photonic crystal fiber 5 to shaft angle degree is fused to Y with 90 °
On waveguide B9.
Step 2: applying modulation magnetic field；
Apply modulation magnetic field in the place close to fusion point B4, magnetic direction is as shown in Figure 2.If the light intensity of light source 1 is P0,
It is α from light source 1 to the loss of the position fusion point B41, the loss of 10 positions is α from fusion point B4 to detector2。P1, P2, Pm, P3
And P4Respectively W1, W2, Wm, W3And W4The intensity of corresponding coupling subwave, the coupling subwave W that fusion point B4 is generated2It is corresponding strong
Spend P2Are as follows:
P2=(P0/α1α2)×cos2θ1×sin2θ2 (1)
Subwave W is coupled as caused by magnetic fieldmCorresponding intensity PmAre as follows:
Wherein: V is the Verdet constant of optical fiber, and B is the intensity for modulating magnetic field, and ω is the frequency for modulating magnetic field, LBFor light
Fine bat is long, and L is the length across field region optical fiber.
By selecting suitable light source 1, and the tail optical fiber of Y waveguide A2 is adjusted, the tail optical fiber and hollow polarization-maintaining photon of Y waveguide B9
The length of crystal optical fibre 5, so that only P2And PmIt interferes, and couples with other between subwave and do not interfere.
P known to then2And PmBetween the intensity that interferes be
Wherein: P2For DC quantity, therefore amplifier 13 can be phase locked and filtered.PmIt comparesIt can ignore not
Meter.For the self-coherence function of light source,For P2And PmBetween optical path difference, λ is the mean wavelength of light source, and c is
The light velocity.WhenIt is 0, and IintWhen taking close to the maximum peak-to-peak value of fusion point B4, IintIt can approximately indicate are as follows:
Step 3: keeping testing fiber precision mobile；
Due to during actual measurement, it is difficult to differentiate the relative position of fusion point B4 and magnetic field coupling point, and optical fiber is clapped
Length is very short, and a small displacement will makeChange it is bigger, to influence I in formula (3)intAs a result, therefore, it is necessary to make
Optical fiber does the periodically accurate movement of duration, to keep the relative position duration of fusion point B4 and magnetic field coupling point periodical
Change, while recording the demodulation value in moving process.
In the specific implementation process, hollow polarization-maintaining photonic crystal fiber 5 is clamped on one-dimensional automatically controlled displacement platform 12, makes one
It ties up the automatically controlled dragging of displacement platform 12 hollow polarization-maintaining photonic crystal fiber and does periodically accurate movement, while using lock-in amplifier 13
The demodulation value of synchronous recording result of interference.As a result as shown in Figure 3.Step 4: calculating Verdet constant according to demodulation value；
According to the detector for being R across resistance, then to I in formula (4)int-p-pThe voltage value of generation are as follows:
Vint-p-p=Iint-p-p×R (5)
The expression formula of Verdet counter can be then pushed away by (4) and (5) are as follows:
By taking hollow polarization-maintaining photonic crystal fiber as an example, Fig. 3 (a) is the test result of hollow polarization-maintaining photonic crystal fiber, Fig. 3
It (b) is the enlarged drawing of the rectangular area Fig. 3 (a).By measuring principle it is found that the peak-to-peak value V at first, right side peakp-p1For Y waveguide tail
Fine Vint-p-p, and the peak-to-peak value V at first, left side peakp-p2For the V of hollow polarization-maintaining photonic crystal fiberint-p-p.It substitutes into respectively each
From Vint-p-pAnd corresponding magnetic field value can find out the corresponding Verdet constant of various optical fiber.
Claims (4)
1. a kind of hollow polarization-maintaining photonic crystal fiber Verdet constant measuring apparatus, including light source, Y waveguide A, hollow polarization-maintaining photon
Crystal optical fibre, electromagnet, Y waveguide B, detector, signal generator, one-dimensional automatically controlled displacement platform and lock-in amplifier；
The light that light source issues becomes line polarisation after Y waveguide A and enters hollow polarization-maintaining photonic crystal fiber, and Coupling point A is Y waveguide
The chip of A and the Coupling point of tail optical fiber, if coupling angle is θ1, the coupling subwave that light generates at Coupling point A is W1, hollow polarization-maintaining
The tail optical fiber of photonic crystal fiber and Y waveguide A are with certain to axis angle, θ2Welding is carried out, fusion point B, the coupling time of generation are formed
Wave is W2, into hollow polarization-maintaining photonic crystal fiber light when by electromagnet, polarization cross coupling occurs, generation
Coupling subwave is Wm, light reaches detector after Y waveguide B, the tail optical fiber of hollow polarization-maintaining photonic crystal fiber and Y waveguide B with
90 ° carry out welding to shaft angle degree, form fusion point C, the coupling subwave of generation is W3, the chip of Y waveguide B and the coupling of tail optical fiber
Chalaza is Coupling point D, if coupling angle is θ4, the coupling subwave of generation is W4, the coupling subwave for finally reaching detector is W1,
W2, Wm, W3And W4, signal generator is modulated the magnetic field of electromagnet, the signal modulated and signal that detector detects
The modulated signal of generator is all transferred to lock-in amplifier, and one-dimensional automatically controlled displacement platform dragging hollow polarization-maintaining photonic crystal fiber does essence
Dense bit moves, while the demodulation of lock-in amplifier record variation.
2. a kind of hollow polarization-maintaining photonic crystal fiber Verdet constant measuring apparatus according to claim 1, the light
Source uses high-power ASE light source.
3. a kind of hollow polarization-maintaining photonic crystal fiber Verdet constant measurement method, specifically includes the following steps:
Step 1: welding testing fiber；
First by hollow polarization-maintaining photonic crystal fiber to axis angle, θ2It is fused on Y waveguide A, hollow polarization-maintaining photonic crystal fiber
With 90 ° be fused on Y waveguide B to shaft angle degree；
Step 2: applying modulation magnetic field；
Apply modulation magnetic field at fusion point B, if the light intensity of light source is P0, it is α from light source to the loss of fusion point B location1, from
The loss of fusion point B to detector position is α2, P1, P2, Pm, P3And P4Respectively W1, W2, Wm, W3And W4Corresponding coupling subwave
Intensity, fusion point B generate coupling subwave W2Corresponding intensity P2Are as follows:
P2=(P0/α1α2)×cos2θ1×sin2θ2 (1)
Subwave W is coupled as caused by magnetic fieldmCorresponding intensity PmAre as follows:
Wherein: V is the Verdet constant of optical fiber, and B is the intensity for modulating magnetic field, and ω is the frequency for modulating magnetic field, LBFor the bat of optical fiber
Long, L is the length across field region optical fiber；
By selecting light source, the tail optical fiber of Y waveguide A, the tail optical fiber of Y waveguide B and the length of hollow polarization-maintaining photonic crystal fiber are adjusted, is made
Must there was only P2And PmIt interferes, and couples with other between subwave and do not interfere；
Then P2And PmBetween the intensity that interferes be
Wherein: P2For DC quantity, it is phase locked amplifier and filters, PmIt ignores,For the self-coherence function of light source,For P2And PmBetween optical path difference, λ is the mean wavelength of light source, and c is the light velocity；WhenIt is 0, and IintIt takes close to welding
When the maximum peak-to-peak value of point B, IintIt indicates are as follows:
Step 3: keeping testing fiber precision mobile；
Optical fiber does the periodically accurate movement of duration, keeps the relative position duration of fusion point B and magnetic field coupling point periodical
Change, record moving process in demodulation value；
Step 4: calculating Verdet constant according to demodulation value；
According to the detector for being R across resistance, then to I in formula (4)int-p-pThe voltage value of generation are as follows:
Vint-p-p=Iint-p-p×R (5)
Then by (4) and (5) the anti-expression formula for pushing away Verdet are as follows:
4. a kind of hollow polarization-maintaining photonic crystal fiber Verdet constant measurement method according to claim 3, the step
In rapid one, θ2It is chosen at the maximum value met under the premise of not will lead to detector saturation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710263584.5A CN107101805B (en) | 2017-04-21 | 2017-04-21 | Hollow polarization-maintaining photonic crystal fiber Verdet constant measuring apparatus and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710263584.5A CN107101805B (en) | 2017-04-21 | 2017-04-21 | Hollow polarization-maintaining photonic crystal fiber Verdet constant measuring apparatus and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107101805A CN107101805A (en) | 2017-08-29 |
| CN107101805B true CN107101805B (en) | 2019-03-12 |
Family
ID=59657605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710263584.5A Active CN107101805B (en) | 2017-04-21 | 2017-04-21 | Hollow polarization-maintaining photonic crystal fiber Verdet constant measuring apparatus and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107101805B (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0853765B1 (en) * | 1995-10-04 | 2000-05-17 | Minnesota Mining And Manufacturing Company | Verdet constant temperature-compensated current sensor |
| CN1808074A (en) * | 2006-02-24 | 2006-07-26 | 北京航空航天大学 | Optical fiber gyro frequency character tester based on magneto-optical Farady effect |
| CN102788595A (en) * | 2012-07-27 | 2012-11-21 | 北京航空航天大学 | Optical fiber gyroscope frequency characteristic elevating method and device based on Faraday effect |
| CN103076155B (en) * | 2012-12-31 | 2015-07-01 | 北京航空航天大学 | Optical fiber Verdet constant measurement system on basis of double optical paths |
| CN103196655B (en) * | 2013-01-14 | 2016-02-17 | 北京航空航天大学 | A kind of polarization maintaining optical fibre Verdet constant measuring apparatus and method |
| CN103292976A (en) * | 2013-05-16 | 2013-09-11 | 北京航空航天大学 | Interferometry-based optical fiber Verdet constant measuring system |
| CN103411597B (en) * | 2013-07-23 | 2016-05-18 | 北京航空航天大学 | A kind of interfere type closed-loop fiber optic gyroscope instrument based on circulation multi-turn effect |
| CN103605005B (en) * | 2013-11-13 | 2016-05-25 | 清华大学 | A kind of photoelectric integration electric-field measuring system based on two Y waveguides |
| CN104931232A (en) * | 2015-06-12 | 2015-09-23 | 上海大学 | Test device and method of Verdet constant of doped optical fiber |
| CN106546411B (en) * | 2016-10-19 | 2018-09-28 | 北京航空航天大学 | Polarization maintaining optical fibre Verdet constant measuring apparatus and method based on Mach-Zehnder and Michelson interferometers |
-
2017
- 2017-04-21 CN CN201710263584.5A patent/CN107101805B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107101805A (en) | 2017-08-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104677508B (en) | A kind of atomic spin precession detection method and device that light is detected based on circular polarization | |
| JP2769924B2 (en) | Optical fiber rotation sensor | |
| US5153676A (en) | Apparatus and method for reducing phase errors in an interferometer | |
| Peng et al. | Fiber optic current sensor based on special spun highly birefringent fiber | |
| US6798523B2 (en) | Sensor and method for detecting fiber optic faults | |
| US6122415A (en) | In-line electro-optic voltage sensor | |
| US4112367A (en) | Magnetomer using a thin magnetic film optical waveguide with a.c. modulation and automatic nulling | |
| CN109883412A (en) | A kind of double path optical fiber gyroscopes | |
| CN108036783A (en) | Non-interfering formula optical gyroscope and sensing spinning solution based on polarization detection technology | |
| CN106546411B (en) | Polarization maintaining optical fibre Verdet constant measuring apparatus and method based on Mach-Zehnder and Michelson interferometers | |
| CN111089578B (en) | Interference type optical fiber gyroscope | |
| US6801319B2 (en) | Symmetrical depolarized fiber optic gyroscope | |
| CN106525093A (en) | Fiber vector magnetic field sensor based on magnetofluid nonuniform clusters and manufacturing method | |
| CN102788595A (en) | Optical fiber gyroscope frequency characteristic elevating method and device based on Faraday effect | |
| CN102721827B (en) | Optical fiber accelerometer | |
| CN103162836A (en) | Device and method for detecting optical interference of light polarization tiny corner | |
| CN104374410A (en) | Measurement device and method for fiber loop fusion point reflection in photonic bandgap fiber gyroscope | |
| CN110174547A (en) | A kind of inverse piezoelectric type optical fibre voltage sensor | |
| CA2003945C (en) | Apparatus and method for processing fiber optic rotation sensor signals | |
| Yang | Temperature sensor based on PNR in Sagnac interferometer | |
| Zhou et al. | Temperature and vibration insensitive fiber optic vector magnetic field sensor | |
| Qi et al. | An ultra-short coil fiber optic gyroscope | |
| CN107101805B (en) | Hollow polarization-maintaining photonic crystal fiber Verdet constant measuring apparatus and method | |
| CN106796125B (en) | Interference determination sensor with differential modulated phase-detection | |
| Strandjord et al. | Resonator fiber optic gyro progress including observation of navigation grade angle random walk |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |