CN110530497A - Interference-type optical fiber vibrating sensing demodulating system and method based on optical-electronic oscillator - Google Patents
Interference-type optical fiber vibrating sensing demodulating system and method based on optical-electronic oscillator Download PDFInfo
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- CN110530497A CN110530497A CN201910724576.5A CN201910724576A CN110530497A CN 110530497 A CN110530497 A CN 110530497A CN 201910724576 A CN201910724576 A CN 201910724576A CN 110530497 A CN110530497 A CN 110530497A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35322—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using interferometer with one loop with several directions of circulation of the light, e.g. Sagnac interferometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35325—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using interferometer with two arms in reflection, e.g. Mickelson interferometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35329—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using interferometer with two arms in transmission, e.g. Mach-Zender interferometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
Abstract
The present invention provides a kind of interference-type optical fiber vibrating sensing demodulating system and method based on optical-electronic oscillator.System specifically includes that light source, electrooptic modulator, interference-type vibrating sensing unit, Polarization Controller, the polarizer, photodetector, microwave amplifier, power splitter and frequency monitoring unit.The present invention generates the orthogonal different frequency component carrier and single order single-side belt of phase correlated polarizations by using electro-optical modulation device, then it is isolated out using polarization characteristic, transmit it respectively along two interfere arms in interference-type vibrating sensing unit, to which the phase difference containing vibration signal to be measured to be converted to the variation of the optical-electronic oscillator microwave oscillation frequency with high q-factor, therefore vibration signal to be measured can be demodulated by the frequency variation that monitoring optical-electronic oscillator exports microwave signal.The frequency variation is directly proportional to vibration signal to be measured, and proportionality coefficient is decided by optical carrier frequency, therefore can realize high sensitivity, precision are high and response is fast vibration detection and demodulation.
Description
Technical field
The present invention relates to the technical fields such as optical fiber optics, Fibre Optical Sensor, fibre optic hydrophone and microwave photon more particularly to one
Interference-type optical fiber vibrating sensing demodulating system and method for the kind based on optical-electronic oscillator.
Background technique
Vibration problem be in Modern Physics and scientific and technical various fields in want project, vibrating sensing is widely used in
In the status monitoring of hydrophone, seismic monitoring, oil well, security protection and architectural engineering and infrastructure etc..It is compared to traditional
Electromagnetism class vibrating sensor, optical fibre vibration sensor have electromagnetism interference, corrosion-resistant, small in size, easy multiplexing and easily networking etc.
Feature, concern and research by related scholar.According to by the difference of modulation physical parameter, optical fibre vibration sensor can be at present
It is divided into intensity modulation type optical fibre vibration sensor, phase modulation-type optical fibre vibration sensor and wavelength modulation type optical fiber vibration sensing
Device.It is wherein mature using interferometer as the phase modulation-type optical fibre vibration sensor Technical comparing of sensing unit, using also relatively wider
It is general.
By using interference structure, signal phase caused by extraneous vibration changes the change that can be converted into Output optical power
Change, therefore detects that the variation of interferometer Output optical power can detect extraneous vibration signal.But the output light of interferometer
Power and vibration signal to be measured are at sine relation, and which greatly limits the dynamic ranges of vibrating sensor.At present frequently with phase
Carrier wave (PGC) technology is generated to improve the performance of optical fibre vibration sensor, but this needs additional microwave signal source and used
Demodulating algorithm limits the performance of system to a certain extent.
Optical-electronic oscillator provides new thinking to simplify the demodulating system of interference-type optical fiber sensing unit, is containing light
The hybrid resonant chamber on road and circuit can connect well Fibre Optical Sensor unit and electrical domain demodulating system.And photoelectricity shakes
Swinging the phase that device generates signal in the frequency and optical path of microwave signal has direct relationship, therefore phase modulation-type optical fiber is passed
Sensor can greatly simplify the demodulation mode of system while improving sensor-based system performance in conjunction with optical-electronic oscillator.
Summary of the invention
The interference-type optical fiber vibrating sensing demodulating system that the embodiment provides a kind of based on optical-electronic oscillator and
Method, to solve the problems in above-mentioned background technique.
To achieve the goals above, this invention takes following technical solutions:
The present invention provides a kind of interference-type optical fiber vibrating sensing demodulating system and method based on optical-electronic oscillator, it is special
Sign is that the device includes: light source, electrooptic modulator, interference-type vibrating sensing unit, Polarization Controller, the polarizer, photoelectricity spy
Survey device, microwave amplifier, power splitter and frequency monitoring unit；Wherein:
For generating light carrier, output end is connected the light source with the electrooptic modulator light input end；
The electrooptic modulator is for generating the orthogonal carrier wave f of phase correlated polarizations0With single order single-side belt f1, radio frequency is defeated
Entering end is the microwave signal that optical-electronic oscillator generates, and light output end is connected with the interference-type optical fiber vibrating sensing unit；
The interference-type optical fiber vibrating sensing unit is used for extraneous vibration signal detection, including Mach-Zehnder interference type passes
Feel unit, Michelson interference type sensing unit and Sagnac interference-type sensing unit, the signal point of two interfere arm transmission
It Wei not carrier wave f0With single order single-side belt f1, carrier wave f0With single order single-side belt f1It is separated using polarization characteristic；
The Polarization Controller input terminal is connected with interference-type optical fiber vibrating sensing unit output end, output end with described
Inclined device is connected, for adjusting carrier wave f0With single order single-side belt f1Polarization state, interfere it at the polarizer；
The photodetector is used to be converted to the signal after the interference electric signal, and the electric signal passes through the band
After bandpass filter and the microwave amplifier, two parts are divided by the power splitter；
One of output end of the power splitter is connected with the radio-frequency head of the electrooptic modulator, forms optical-electronic oscillator
Loop, another output is connected with the frequency monitoring unit；
The microwave frequency monitoring unit is used to measure the frequency variation of optical-electronic oscillator microwave oscillation signal, extraneous to be measured
F caused by vibration signal0And f1Between phase difference will lead to optical-electronic oscillator generate microwave signal frequency change, because
This can get vibration signal to be measured by the output signal of frequency monitoring unit.
As can be seen from the technical scheme provided by the above-mentioned embodiment of the present invention, the embodiment of the invention provides one kind to be based on
The interference-type optical fiber vibrating sensing demodulating system and method for optical-electronic oscillator, by making two arms of interferometer transmit different frequencies
Rate component f0And f1, the frequency variation that caused phase difference is converted to the high q-factor microwave signal of optical-electronic oscillator generation will be vibrated,
And the linear scale factor of the frequency variation and phase difference variable quantity is decided by optical signal frequency.Measurement method benefit of the invention
It can be microwave signal by vibration signal linear transfor to be measured while improving measurement accuracy with the optical-electronic oscillator of high q-factor
Frequency variation increases the dynamic range of measurement to simplify demodulating system.
The additional aspect of the present invention and advantage will be set forth in part in the description, these will become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill of field, without any creative labor, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of interference-type optical fiber vibrating sensing demodulating system based on optical-electronic oscillator provided in an embodiment of the present invention
Structural schematic diagram one；
Fig. 2 is two kinds provided in an embodiment of the present invention and generates the orthogonal load of phase correlated polarizations using commercial electrooptic modulator
Wave and single order single-side belt method schematic diagram；
Fig. 3 is the schematic diagram of signal transmission in three kinds of interference-type optical fibers vibrating sensing unit provided in an embodiment of the present invention；
Fig. 4 is a kind of interference-type optical fiber vibrating sensing demodulating system based on optical-electronic oscillator provided in an embodiment of the present invention
Structural schematic diagram two；
Wherein, 1- light source, 2- electrooptic modulator, 3- interference-type vibrating sensing unit, 4- Polarization Controller, the 5- polarizer,
6- photodetector, 7- bandpass filter, 8- microwave amplifier, 9- power splitter, 10- frequency monitoring unit.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singular " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that being arranged used in specification of the invention
Diction " comprising " refer to that there are the feature, integer, step, operation, element and/or component, but it is not excluded that in the presence of or addition
Other one or more features, integer, step, operation, element, component and/or their group.It should be understood that when we claim member
Part is " connected " or when " coupled " to another element, it can be directly connected or coupled to other elements, or there may also be
Intermediary element.In addition, " connection " used herein or " coupling " may include being wirelessly connected or coupling.Wording used herein
"and/or" includes one or more associated any cells for listing item and all combinations.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific term) there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, which should be understood that, to be had and the meaning in the context of the prior art
The consistent meaning of justice, and unless defined as here, it will not be explained in an idealized or overly formal meaning.
In order to facilitate understanding of embodiments of the present invention, it is done by taking several specific embodiments as an example below in conjunction with attached drawing further
Explanation, and each embodiment does not constitute the restriction to the embodiment of the present invention.
Embodiment one
The interference-type optical fiber vibrating sensing demodulating system and side that the embodiment of the invention provides a kind of based on optical-electronic oscillator
Vibration signal to be measured is mapped in the frequency variation of microwave signal caused by optical-electronic oscillator, improves oscillating pickup system by method
The measurement accuracy of system increases dynamic range, simplifies demodulation mode.
A kind of structure of the interference-type optical fiber vibrating sensing demodulating system of optical-electronic oscillator provided in an embodiment of the present invention is shown
Be intended to one as shown in Figure 1, the device include: light source 1, electrooptic modulator 2, interference-type vibrating sensing unit 3, Polarization Controller 4,
The polarizer 5, photodetector 6, bandpass filter 7, microwave amplifier 8, power splitter 9 and frequency monitoring unit 10.
The light source 1 is connected with 2 light input port of electrooptic modulator, and the interference-type vibrating sensing unit 3 inputs
End is connected with 2 optical output port of electrooptic modulator, and output end is connected with 4 input terminal of Polarization Controller；The polarization
The output of controller 4 is connected with the polarizer 5 input；The output of the polarizer 5 is connected with 6 light of photodetector input；
6 electricity output of photodetector is connected with the bandpass filter 7 input；7 output end of bandpass filter with it is described micro-
8 input terminal of twt amplifier is connected；9 input terminal of power splitter is connected with 8 output port of microwave amplifier, two output ends
It is connected respectively with 2 prevention at radio-frequency port of electrooptic modulator and the frequency monitoring unit 10.
The particular content of each component of the device is as follows:
(1) light source
Light source is commercial narrow linewidth laser, and for generating light carrier, the microwave signal that optical-electronic oscillator generates passes through electricity
Light modulator modulates are on the light carrier, then along optic path.
(2) electrooptic modulator
Electrooptic modulator is for generating the orthogonal carrier wave of phase correlated polarizations and single order single-side belt, in addition to commercial phase tune
Outside type processed, intensity modulation type and polarization-modulating type modulator, it is also necessary to generate required modulation using some additional devices
Signal.
Fig. 2 show two kinds and adds additional device to generate the orthogonal carrier wave and single order of phase correlated polarizations using commercial modulator
The schematic diagram of single-side belt.Wherein Fig. 2-is 1. the carrier wave orthogonal using commercial MZ Mach-Zehnder generation phase correlated polarizations
With the schematic diagram of single order single-side belt.The MZ Mach-Zehnder 12 is polarization relationship type modulator, i.e. polarization state and main shaft is flat
Capable light carrier can be modulated, and the light carrier of polarization state vertical major incidence will not be modulated substantially.If mach zhender tune
The main shaft of device 12 processed is y-axis, and direction normal thereto is x-axis.The inclined of the light carrier that light source 1 exports is adjusted using Polarization Control 11
Polarization state keeps it incident (a point) at 45 ° with 12 main shaft of modulator, adjusts bias voltage, modulator is made to work in minimum operating point,
Ignore higher order signal, is then on the direction of vertical major carrier wave (b point) containing only there are two single order sideband on modulator main shaft.Again
One of sideband is filtered out using an optical band pass filter 13, the orthogonal carrier wave f of phase correlated polarizations can be obtained0And single order
Single-side belt f1(c point).
Fig. 2-2. show the carrier wave and single order list that polarized orthogonal is generated using commercial double parallel MZ Mach-Zehnder
The schematic diagram of sideband.Double parallel mach zhender electrooptic modulator 17 by two sub- MZ Mach-Zehnder MZM1, MZM2 simultaneously
Join.First Polarization Controller 14 controls the polarization state that light source 1 exports light carrier, makes itself and double parallel mach zhender
The main shaft of modulator (a point) at 45 ° is incident, at this point, being located at the optical signal on double parallel mach zhender electrooptic modulator main shaft
It is modulated, and is not modulated substantially with the optical signal in main shaft vertical direction.Equally set the main shaft of modulator 17 as y-axis, therewith
Vertical direction is x-axis.The oscillating microwave signal that optical-electronic oscillator generates is divided into two parts through power splitter 16, and a portion adds
It is downloaded to the radio-frequency head of MZM1, another part is loaded into the radio-frequency head of MZM2 after phase-shifter 15 carries out 90 ° of phase shifts.Adjust load
Bias voltage V on to electrooptic modulator 17bias1And Vbias2, make modulation system carrier suppressed modulation, then ignoring high-order side
In the case where band, there was only positive and negative single order sideband, only carrier component f in x-axis in y-axis0.In these cases, MZM1 exports (b
Point) the phase of positive and negative single order sideband be all 0, and the phase of the positive and negative single order sideband of MZM2 output (c point) be -90 ° respectively,
90°.And then adjust bias voltage Vbias3, make 90 ° of phase change of b point signal, then in the positive and negative single order sideband of d point output
Phase is all 90 °.For the signal of c point and d point when e point couples, the cancellation due to 180 ° of negative one rank sideband difference finally generates phase
The orthogonal carrier wave f of position correlated polarizations0With positive single order sideband f1Two frequency components.
(3) interference-type vibrating sensing unit
Interference-type vibrating sensing unit refers mainly to optical fiber interference type sensing unit, for the detection of extraneous vibration signal, packet
Include Mach-Zehnder interference type, Michelson interference type and Sagnac interference-type.Fig. 3 show three kinds of interference-type optical fiber vibrations and passes
Feel the schematic diagram of signal transmission in unit.In order to make two arms of interferometer (for Sagnac interference-type, two interfere arm point
Do not refer to clockwise transmission optical path and counterclockwise transmission optical path) the different carrier wave f of difference transmission frequency0With single order single-side belt f1, need
F is realized using polarization beam apparatus 18 and polarization beam combiner 190And f1Separation with merge.Simultaneously for reflection interferometer, such as step
Ke Erxun interference-type and Sagnac interference-type need to guide the transmission of optical signal using optical circulator 20.
(4) Polarization Controller
Polarization Controller is for adjusting carrier wave f0With single order single-side belt f1Polarization state, keep it at 45 ° with the main shaft of the polarizer
Angle, using commercial devices.
(5) polarizer
The polarizer is for making carrier wave f0With single order single-side belt f1Interfered, using commercial devices.
(6) photodetector
Photodetector is used to the optical signal after interference being changed into electric signal.
(7) bandpass filter
The mode that bandpass filter is used to that optical-electronic oscillator to be selected to vibrate, makes optical-electronic oscillator single-mode oscillation.
(8) microwave amplifier
The electric signal that microwave amplifier is used to export the bandpass filter amplifies.
(9) power splitter
The power splitter is used to the electric signal that the microwave amplifier amplifies being divided into two parts；Wherein, a part adds
It is downloaded to the radio-frequency head of the optical modulator, forms the loop of optical-electronic oscillator；Output of the another part as microwave signal.
(10) frequency monitoring unit
Frequency monitoring unit is used to monitor the frequency variation that optical-electronic oscillator generates microwave signal, can therefrom obtain to be measured
Vibration signal.
Embodiment two
The interference-type optical fiber vibrating sensing demodulating system based on optical-electronic oscillator that this embodiment offers a kind of, it is specific real
Existing structure is as shown in figure 4, the measuring device includes: light source 1, electrooptic modulator 2, interference-type vibrating sensing unit 3, Polarization Control
Device 4, the polarizer 5, photodetector 6, bandpass filter 7, microwave amplifier 8, power splitter 9 and frequency monitoring unit 10.
With the system of the embodiment of the present invention carry out interference-type optical fiber vibrating sensing demodulation concrete principle and embodiment with
Description in previous embodiment one is similar, and details are not described herein again.The embodiment of the present invention and embodiment one the difference is that: In
In the embodiment of the present invention, the optical signal of the light source output first passes through the interference-type vibrating sensing unit, then by the electricity
Optical modulator is modulated, and is changed into electric signal, the electricity by the photodetector after being interfered at the polarizer
Signal is divided into two parts after the bandpass filter and the microwave amplifier are filtered and amplify, by the power splitter,
A portion is loaded into the radio-frequency head of the electrooptic modulator, forms the loop of optical-electronic oscillator, and another part electric signal is made
For the output of microwave signal, vibration signal demodulation is carried out by the frequency monitoring unit.It should be noted that at this time by described dry
The signal for relating to the output of type vibrating sensing unit is the orthogonal light carrier of phase correlated polarizations, enters the Electro-optical Modulation adjusting it
When polarization state when device, need to keep the light carrier of one of polarization state parallel with the main shaft of the electrooptic modulator.
Compared with prior art, the invention has the benefit that
(1) for the present invention using optical-electronic oscillator as resonant cavity, the oscillating microwave signal phase noise of generation is lower, stablizes
Property it is preferable, the resolution ratio and precision of vibrating sensing can be improved, while not needing external microwave source, reduce system complexity and
Cost.
(2) by the present invention in that two interfere arms in interference-type optical fiber vibrating sensing unit transmit different frequency component
Carrier wave and single order single-side belt, so that phase difference caused by vibration to be measured to be mapped to the frequency of microwave signal produced by optical-electronic oscillator
In rate variation, the linear scale factor of the frequency variation and phase difference is decided by the frequency of optical signal (generally in THz magnitude),
Increase measurement sensitivity；Vibration signal to be measured can be demodulated by monitoring the variation of its frequency simultaneously, simplifies demodulation mode.
In conclusion the embodiment of the present invention is by providing a kind of interference-type optical fiber vibrating sensing solution based on electrical oscillator
Adjusting system and method are generated the carrier wave and single order single-side belt of polarized orthogonal using electrooptic modulator, are separated using polarization characteristic
Afterwards, it transmits it along two arms of interference-type sensing unit, after being interfered at the polarizer, is turned by photodetector
Become electric signal；Electric signal is transferred to power splitter, a part of electricity of power splitter output by bandpass filter and microwave amplifier
Signal loading forms the loop of optical-electronic oscillator, another part electric signal is as microwave signal to the radio-frequency head of optical modulator
Output, can demodulate vibration signal to be measured by the output of frequency monitoring unit.
Those of ordinary skill in the art will appreciate that: attached drawing is the schematic diagram of one embodiment, module in attached drawing or
Process is not necessarily implemented necessary to the present invention.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for device or
For system embodiment, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to method
The part of embodiment illustrates.Apparatus and system embodiment described above is only schematical, wherein the conduct
The unit of separate part description may or may not be physically separated, component shown as a unit can be or
Person may not be physical unit, it can and it is in one place, or may be distributed over multiple network units.It can root
According to actual need that some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.Ordinary skill
Personnel can understand and implement without creative efforts.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims
Subject to.
Claims (6)
1. a kind of interference-type optical fiber vibrating sensing demodulating system and method based on optical-electronic oscillator, which is characterized in that the system
It include: light source, electrooptic modulator, interference-type vibrating sensing unit, Polarization Controller, the polarizer, photodetector, microwave amplification
Device, power splitter and frequency monitoring unit；Wherein the light source is connected with the electrooptic modulator light input port；The interference-type
Vibrating sensing unit input terminal is connected with the electrooptic modulator optical output port, output end and the Polarization Controller input terminal
It is connected；The Polarization Controller output is connected with polarizer input；The polarizer output and the photodetector light
Input is connected；The photodetector electricity output is connected with bandpass filter input；The bandpass filter output end with
The microwave amplifier input terminal is connected；The power splitter input terminal is connected with the microwave amplifier output port, and two defeated
Outlet is connected with the electrooptic modulator prevention at radio-frequency port and the frequency monitoring unit respectively.
2. the interference-type optical fiber vibrating sensing demodulating system according to claim 1 based on optical-electronic oscillator, feature exist
In the electrooptic modulator is for generating the orthogonal carrier wave f of phase correlated polarizations0With single order single-side belt f1, including but not limited to by force
Spend modulation type modulator, phase modulation-type modulator, polarization-modulating type modulator and other auxiliary elements.
3. the interference-type optical fiber vibrating sensing demodulating system according to claim 1 based on optical-electronic oscillator, feature exist
In the interference-type vibrating sensing unit includes Mach-Zehnder interference type sensing unit, Michelson interference type sensing unit
Signal with Sagnac interference-type sensing unit, the transmission of two of them interfere arm is respectively carrier wave f0With single order single-side belt f1, by inclined
Vibration point/bundling device is realized separation and is merged；For Michelson interference type sensing unit and Sagnac interference-type sensing unit, benefit
With the transmission of optical circulator guidance optical signal.
4. the interference-type optical fiber vibrating sensing demodulating system according to claim 1 based on optical-electronic oscillator, feature exist
In Polarization Controller is used to adjust the carrier wave f of polarized orthogonal0With single order single-side belt f1Polarization state, make itself and the polarizer
Main shaft angle at 45 °, two interfere arm signals interfere at the polarizer.
5. a kind of interference-type vibrating sensing demodulation method based on optical-electronic oscillator is applied to described in any one of claim 1-4
Device, which is characterized in that by two signal carrier f in the interference-type vibrating sensing unit0With single order single-side belt f1In
After being interfered at the polarizer, electric signal is changed by the photodetector；The electric signal is filtered by the band logical
The power splitter is transferred to after wave device and the microwave amplifier, a part of electric signal of the power splitter output is loaded into described
The radio-frequency head of optical modulator forms the loop of optical-electronic oscillator；Another part electric signal of the power splitter output is as microwave
The output of signal measures its frequency by frequency monitoring unit；The phase difference as caused by extraneous vibration can be converted into photoelectricity
The variation of oscillator for generating microwave signal frequency, therefore vibration signal to be measured can be demodulated according to the result that frequency discriminator exports.
6. the interference-type optical fiber vibrating sensing demodulation method according to claim 5 based on optical-electronic oscillator, feature exist
In the frequency monitoring unit is used to measure the frequency variation that optical-electronic oscillator generates microwave signal, including but not limited to quotient
With microwave discriminator, Microwave Spectrum Analyser and data acquisition and processing (DAP) unit etc..
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110926511A (en) * | 2019-12-06 | 2020-03-27 | 北京工业大学 | Broadband high-resolution spectral response measurement system and method |
| CN111486939A (en) * | 2020-04-24 | 2020-08-04 | 中山大学 | Ultrasonic measuring device for realizing optical path and polarization state regulation and control based on SAGNAC principle |
| CN112097812A (en) * | 2020-09-15 | 2020-12-18 | 安徽大学 | Method for expanding working bandwidth of interference type optical fiber sensing system through balanced filtering |
| CN113390441A (en) * | 2021-06-01 | 2021-09-14 | 重庆邮电大学 | Refractive index change sensing device and measuring method |
| CN116878394A (en) * | 2023-08-02 | 2023-10-13 | 哈尔滨工业大学 | Interference displacement measurement system and method for polarized light phase modulation of microprobe |
| CN116878394B (en) * | 2023-08-02 | 2024-04-19 | 哈尔滨工业大学 | Interference displacement measurement system and method for polarized light phase modulation of microprobe |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006208080A (en) * | 2005-01-26 | 2006-08-10 | Hitachi Cable Ltd | Optical fiber vibration sensor |
| CN106643522A (en) * | 2016-12-28 | 2017-05-10 | 西南交通大学 | Optical-fiber low-coherence interference displacement demodulation device and method based on photoelectric oscillator |
| CN107084713A (en) * | 2017-05-26 | 2017-08-22 | 北京交通大学 | Method for measuring angular velocity and device based on optical-electronic oscillator |
| CN108731789A (en) * | 2018-07-30 | 2018-11-02 | 中国海洋大学 | Underwater Detection device based on optical-electronic oscillator |
-
2019
- 2019-08-07 CN CN201910724576.5A patent/CN110530497A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006208080A (en) * | 2005-01-26 | 2006-08-10 | Hitachi Cable Ltd | Optical fiber vibration sensor |
| CN106643522A (en) * | 2016-12-28 | 2017-05-10 | 西南交通大学 | Optical-fiber low-coherence interference displacement demodulation device and method based on photoelectric oscillator |
| CN107084713A (en) * | 2017-05-26 | 2017-08-22 | 北京交通大学 | Method for measuring angular velocity and device based on optical-electronic oscillator |
| CN108731789A (en) * | 2018-07-30 | 2018-11-02 | 中国海洋大学 | Underwater Detection device based on optical-electronic oscillator |
Non-Patent Citations (1)
| Title |
|---|
| JING ZHANG等: "High-sensitivity measurement of angular velocity based on an optoelectronic oscillator with an intra-loop Sagnac interferometer", 《OPTICS LETTERS》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110926511A (en) * | 2019-12-06 | 2020-03-27 | 北京工业大学 | Broadband high-resolution spectral response measurement system and method |
| CN110926511B (en) * | 2019-12-06 | 2021-11-26 | 北京工业大学 | Broadband high-resolution spectral response measuring method |
| CN111486939A (en) * | 2020-04-24 | 2020-08-04 | 中山大学 | Ultrasonic measuring device for realizing optical path and polarization state regulation and control based on SAGNAC principle |
| CN112097812A (en) * | 2020-09-15 | 2020-12-18 | 安徽大学 | Method for expanding working bandwidth of interference type optical fiber sensing system through balanced filtering |
| CN113390441A (en) * | 2021-06-01 | 2021-09-14 | 重庆邮电大学 | Refractive index change sensing device and measuring method |
| CN116878394A (en) * | 2023-08-02 | 2023-10-13 | 哈尔滨工业大学 | Interference displacement measurement system and method for polarized light phase modulation of microprobe |
| CN116878394B (en) * | 2023-08-02 | 2024-04-19 | 哈尔滨工业大学 | Interference displacement measurement system and method for polarized light phase modulation of microprobe |
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