CN106092079B - The frequency-stabilizing method and frequency regulator of fibre optic gyroscope communication band laser light source - Google Patents
The frequency-stabilizing method and frequency regulator of fibre optic gyroscope communication band laser light source Download PDFInfo
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- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
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Abstract
The frequency-stabilizing method and frequency regulator of fibre optic gyroscope communication band laser light source, the frequency-stabilizing method is divided laser light source, and phase-modulation and frequency multiplication are carried out to weaker light, frequency doubled light and atomic interaction is set to generate spectral signal, frequency stabilization signal is obtained after processing and feeds back to laser light source, realizes frequency stabilization.Device includes laser light source, fiber optic splitter, fibre optic phase modulator, frequency-doubling crystal, reflective integrated atom spectrum device and frequency stabilization circuit.Fiber optic splitter is divided laser light source, fibre optic phase modulator and frequency-doubling crystal carry out phase-modulation and frequency multiplication to weaker light splitting, reflective integrated atom spectrum device realizes frequency doubled light and atomic interaction, sub- Doppler's saturation-absorption spectrum electric signal is obtained, frequency stabilization circuit generates frequency stabilization error signal to spectrum Electric signal processing.The present invention solve fibre optic gyroscope laser light source frequency short-term jitter and it is long when drifting problem, improve the bias instaility and constant multiplier stability of fibre optic gyroscope.
Description
Technical field
The present invention relates to field of inertia measurement, are used for fibre optic gyroscope communication band laser light in particular to one kind
The frequency-stabilizing method and frequency regulator in source.
Background technique
Fibre optic gyroscope is the solid-state of the rotation using the Sagnac effect measurement object of optical fiber loop in inertial space
Inertia device realizes the measurement to rotational angle or angular speed by the measurement to moving interference fringes, is important inertia and leads
Boat equipment.
In fibre optic gyroscope, the movement of interference fringe is directly proportional to rotational angular velocity, but when the frequency of laser light source is sent out
When raw shake or drift, interference fringe will generate the shake or drift unrelated with rotational angular velocity, lead to the defeated of fibre optic gyroscope
Signal generates error out.Generally by temperature and current control circuit come stabilized lasers light in current fibre optic gyroscope design
The frequency in source, but laser light source frequency it is long when drift still can not overcome.
Atom spectrum is the important method of stabilized lasers light source frequency, at low cost, and technology is highly developed, may be implemented
1MHz line width in short-term with it is long when laser frequency stabilization, frequency jitter and the drifting problem of laser light source are solved, in accurate measurement
There is extremely wide application in field.However, since fibre optic gyroscope generally uses swashing for communication band (infrared band)
Radiant, and the spectrum of the neutral atoms such as rubidium, potassium is respectively positioned near infrared band, it is difficult that this allows for atom spectrum frequency stabilization technology
To be applied in fibre optic gyroscope.
All the time, the frequency stability problem of fibre optic gyroscope laser light source is unable to get effective solution, serious to hinder
The raising for having hindered the main performance index such as fibre optic gyroscope bias instaility and constant multiplier stability, affects high-precision optical fiber
The development of gyroscope.
Summary of the invention
Technology of the invention solves the problems, such as: overcoming the deficiencies of the prior art and provide a kind of for fibre optic gyroscope communication
The frequency-stabilizing method and frequency regulator of wave band of laser light source, solve fibre optic gyroscope laser light source frequency it is long when drifting problem, mention
The raising of the main performance index such as high fibre optic gyroscope bias instaility and constant multiplier stability promotes high-precision optical fiber gyro
The development of instrument.
The technical scheme is that the frequency-stabilizing method of fibre optic gyroscope communication band laser light source, includes the following steps:
Step 1: being divided to obtain light splitting p and light splitting s to laser light source emergent light, the power of the light splitting p is weaker than point
Light s, light splitting s enter fibre optic gyroscope；
Step 2: phase-modulation and frequency multiplication being carried out to light splitting p, obtain the frequency doubled light of atom spectrum jump frequency；
Step 3: frequency doubled light and atomic interaction being made to generate spectral signal；
Step 4: spectral signal being handled to obtain frequency stabilization signal, is fed back onto the current control of laser light source, is realized
The closed loop frequency of communication band laser light source is stablized.
There are frequency multiplication relationships for the transition wavelength of the central wavelength of the laser light source and atom spectrum.
The frequency regulator of the frequency-stabilizing method, including laser light source, fiber optic splitter, frequency-doubling crystal, reflective integrated original
Sub-light spectral apparatus and frequency stabilization circuit, laser light source, fiber optic splitter, frequency-doubling crystal and atom spectrum unit pass sequentially through optical fiber
Connection, reflective integrated atom spectrum device, frequency stabilization circuit, laser light source pass sequentially through harness connection；
The fiber optic splitter is used to be divided to obtain light splitting p and light splitting s to laser light source；Frequency-doubling crystal be used for point
Light p carries out frequency multiplication；Reflective integrated atom spectrum device realizes that frequency doubled light and atom vapor interact, and it is full to obtain sub- Doppler
With absorption spectrum signal, and it is translated into electric signal and exports to frequency stabilization circuit；Frequency stabilization circuit is using Lock-in method to reception
Electric signal handled, obtain frequency stabilization signal, in feedback to the current control of laser light source, realize communication band laser light source
Closed loop frequency stablize.
It further include fibre optic phase modulator, the fibre optic phase modulator is connected to fiber optic splitter and frequency multiplication by optical fiber
Between crystal, for carrying out phase-modulation to light splitting p, frequency band is obtained, after the frequency band passes through frequency-doubling crystal frequency multiplication
Frequency it is corresponding with atom spectrum jump frequency.
The reflective integrated atom spectrum device includes optical fiber interface, spectroscope, atomic air chamber, partially reflecting mirror,
One photodetector, the second photodetector and magnetic screen wrapper；Second photodetector, partially reflecting mirror, original
Sub- gas chamber, spectroscope and the first photodetector are successively arranged in magnetic screen wrapper, and the second photodetector, reflection
Mirror, atomic air chamber, spectroscope and the first photodetector center be located at same optical axis, magnetic screen wrapper is for sealing whole
Optical path；The optical fiber interface is located at spectroscopical side, and is fixed on magnetic screen wrapper, optical fiber interface and it is spectroscopical in
The heart is located at same optical axis；
The frequency doubled light is incident on spectroscope through optical fiber interface, and spectroscope reflects the frequency doubled light of about 1/2 power into original
Sub- gas chamber interacts as pump light and atom vapor, and the pump light transmitted from the atomic air chamber is partially reflected mirror edge
The light of original optical path reflection, reflection is received by the first photodetector as detection light and is converted into electric signal output, and part is reflected
The transmitted light of mirror is received by the second photodetector as reference light and is converted into electric signal output.
The splitting ratio of the fiber optic splitter is 1:99-1:9.
The frequency stabilization circuit receives the electric signal of the first photodetector and the output of the second photodetector, to received two
A electric signal obtains subtraction signal as difference, is handled using Lock-in method the subtraction signal, obtains frequency stabilization signal.
Compared with prior art, the present invention has the following advantages:
(1) the method for the present invention and device are realized by frequency doubling technology to fibre optic gyroscope infrared communication wave band of laser light source
Near-infrared atom spectrum frequency stabilization, solve laser light source frequency short-term jitter and it is long when drifting problem, improve light
The bias instaility and constant multiplier stability of fiber gyroscope, promote the development of high precision fiber optic gyroscope.
(2) realization device of the invention inhibits optical fiber top independently of the optic fibre light path of fibre optic gyroscope to the greatest extent
The increase of spiral shell instrument noise source greatly reduces influence of the newly-increased frequency stabilization optical path to fibre optic gyroscope optic fibre light path stability.
(3) the method for the present invention and device do not change the laser wavelength of fibre optic gyroscope, enhance the present invention and existing fiber
The compatibility of gyroscope technology.
(4) present invention cannot be directly multiplied to atom spectrum transition frequency in the emergent light of laser light source after frequency-doubling crystal
In the case where rate, phase-modulation is carried out to light splitting p using fibre optic phase modulator, is obtained through generation pair after frequency-doubling crystal frequency multiplication
The frequency band for answering atom spectrum jump frequency ensure that this method and device to the validity of stabilized lasers light source frequency and can
By property.
(5) reflective integrated atom spectrum device is used in realization device of the invention, which uses anti-
The beam splitting combined beam light road that formula optical path replaces conventional atom spectrum is penetrated, optical element has substantially been simplified, has reduced noise source, reduced
The spatial volume of atom spectrum significantly improves the stability and integration of atom spectrum frequency stabilization.
Detailed description of the invention
Fig. 1 is realization device schematic diagram of the present invention；
Fig. 2 is reflective integrated atom spectrum schematic device of the invention.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments:
The present invention proposes a kind of for fibre optic gyroscope communication band laser light from atom spectrum frequency stabilization technology
The frequency-stabilizing method and realization device in source are realized by frequency doubling technology to the close of fibre optic gyroscope infrared communication wave band of laser light source
Infrared atom spectrum frequency stabilization.
The frequency-stabilizing method of fibre optic gyroscope communication band laser light source, includes the following steps:
Step 1: laser light source 1 is divided to obtain light splitting p and light splitting s, the power of the light splitting p is weaker than light splitting s, point
Light s enters fibre optic gyroscope.
Step 2: phase-modulation and frequency multiplication being carried out to light splitting p, obtain the frequency doubled light of atom spectrum jump frequency.
Step 3: frequency doubled light and atomic interaction being made to generate spectral signal.
Step 4: spectral signal being handled using frequency stabilization electronic technology to obtain frequency stabilization signal, feedback arrives laser light source 1
Current control on, realize communication band laser light source 1 closed loop frequency stablize.
There are frequency multiplication relationship, the atom of step 3 is used for the central wavelength of laser light source 1 and the transition wavelength of atom spectrum
Rubidium atom or potassium atom realize that, that is, if the atom of step 3 is using rubidium atom, 1 central wavelength of laser light source is
1560nm, step 2 obtain the frequency doubled light that wavelength is 780nm after carrying out frequency multiplication.If the atom of step 3 is using potassium original
Son, then 1 central wavelength of laser light source is 1534nm, and step 2 obtains the frequency doubled light that wavelength is 767nm after carrying out frequency multiplication.
The realization device of above-mentioned frequency-stabilizing method, including laser light source 1, fiber optic splitter 2, fibre optic phase modulator 3, frequency multiplication
Crystal 4, reflective integrated atom spectrum device 5 and frequency stabilization circuit 6, laser light source 1, fiber optic splitter 2, fibre optic phase modulator
3, frequency-doubling crystal 4 and reflective integrated atom spectrum device 5 pass sequentially through optical fiber connection, reflective integrated atom spectrum device
5, frequency stabilization circuit 6, laser light source 1 pass sequentially through harness connection.The splitting ratio of fiber optic splitter 2 is 1:99-1:9, for sharp
Radiant 1 is divided, and is obtained light splitting p and is divided s.Fibre optic phase modulator 3 is used to carry out phase-modulation to light splitting p, generates
Frequency band, the frequency after the frequency band frequency multiplication correspond to atom spectrum jump frequency.Frequency-doubling crystal 4 be used for light splitting p or its
Sideband carries out frequency multiplication.Frequency doubled light interacts in reflective integrated atom spectrum device 5 with atom vapor, generates sub- Doppler
Saturation-absorption spectrum optical signal, and electric signal is converted optical signal by reflective integrated atom spectrum device 5 and is exported to frequency stabilization
Circuit 6.
Reflective integrated atom spectrum device 5 is integrated using the reflection of sub- Doppler's saturation-absorption spectrum with optical fiber interface
Device is realized.Reflection integrating device using sub- Doppler's saturation-absorption spectrum of optical fiber interface includes optical fiber interface 51, light splitting
Mirror 52, atomic air chamber 53, partially reflecting mirror 54, the first photodetector 55, the second photodetector 56 and magnetic screen encapsulation
Device 57.Spectroscope 52, atomic air chamber 53, partially reflecting mirror 54, the first photodetection 55, the second photodetector 56 are located at magnetic cup
It covers in wrapper 57, whole optical paths is sealed by magnetic screen wrapper 57；Optical fiber interface 51 is fixed on magnetic screen wrapper 57.
Wherein the second photodetector 56, partially reflecting mirror 54, atomic air chamber 53, spectroscope 52 and the first photodetector 55 are successively arranged
Cloth, and the second photodetector 56, reflecting mirror 54, atomic air chamber 53, spectroscope 52 and the first photodetector 55 centre bit
In same optical axis, optical fiber interface 51 is located at the side of spectroscope 52, and the center of optical fiber interface 51 and spectroscope 52 is positioned at same
Optical axis.Frequency doubled light enters magnetic screen wrapper 57 through optical fiber interface 51 by optical fiber, and spectroscope 52 is by the frequency doubled light of about 1/2 power
It reflects into atomic air chamber 53, interacts as pump light and atom vapor, population is corresponding hyperfine in RESONANCE ABSORPTION line
Atom pumping in structure energy level ground state is fallen, so that atom vapor generates non-linear hole burning to the absorption of pump light.From atom gas
The pump light that room 53 transmits is partially reflected mirror 54 and reflects along original optical path, detects to the hole burning spectrum of atom vapor, is to visit
Survey light.Detection light is received by the first photodetector 55 after original optical path return and converts telecommunications for atom spectrum optical signal
Number, the transmitted light of partially reflecting mirror 54 is received by the second photodetector 56 as reference light and is converted into electric signal.First light
The electric signal of electric explorer 55 and the second photodetector 56 is spread out of by harness to frequency stabilization circuit 6, and frequency stabilization circuit 6 is to the two
It is poor that electric signal is made, and Lock-in frequency stabilization is carried out based on the subtraction signal.Magnetic screen encapsulation 57 seals whole optical paths,
Optical fiber interface 51 is fixed in magnetic screen encapsulation 57.
Frequency stabilization circuit 6 uses Lock-in method.Detailed process is that frequency stabilization circuit 6 applies the current control of laser light source 1
Add the Sine Modulated of a very little, i.e., small modulation, then the light that gained additional frequency is modulated is carried out to the frequency of laser light source 1
Spectrum electric signal (the first photodetector and the electric signal of the second photodetector output make obtained subtraction signal after difference) with just
String modulation is mixed in itself, and removes the radio-frequency component in mixed frequency signal, filtered spectrum electric signal by low-frequency wave
Frequency gradient electric signal, i.e. error signal needed for frequency stabilization will be generated at the absorption peak of corresponding hyperfine levels transition
(frequency stabilization signal).Generally by need to be stable set of frequency in the position of frequency gradient electric signal zero passage, any frequency variation is all
The current control that laser light source 1 is fed back in the form of the voltage change of one big slope draws the voltage of frequency gradient electric signal
Returned zero position, i.e., by the frequency of laser light source 1 retract by stable frequency location, be based on near-infrared rubidium or potassium to realize
The closed loop frequency of the infrared communication wave band of laser light source 1 of atom spectrum is stablized.
The case where the emergent light of laser light source 1 directly can be multiplied to atom spectrum jump frequency through frequency-doubling crystal 4
Under, fibre optic phase modulator 3 can not be used in frequency regulator.
One specific embodiment of apparatus of the present invention is as follows:
Laser light source 1 uses distributed feedback (distributed feedback, DFB) semiconductor laser, to select
Atom be rubidium atom for, 1 central wavelength of laser light source is 1560nm, and the splitting ratio of fiber optic splitter 2 is 1:99.Optical fiber phase
Position modulator 3 uses Thorlabs LN53S-FC, is 10GHz LiNbO3Crystalline phase modulator, FC/PC optical fiber interface.Times
Frequency crystal 4 uses PPLN (the Periodically-poled lithium niobate) crystal unit for being suitable for optic fibre light path,
1560nm is multiplied to the Absorption Line wavelength 780nm of rubidium and potassium atom.Reflective integrated atom spectrum device 5 is connect using band optical fiber
The reflection integrating device of sub- Doppler's saturation-absorption spectrum of mouth, geometric dimension are 15mm × 15mm × 20mm, such atom light
The frequency stabilization signal of spectrum is not excited the influence of 1 polarization state of radiant, and used atomic air chamber is 1000mm3Quartz glass chamber, it is interior
Rubidium atom vapor is encapsulated, but buffer gas is not added, pressure 10-7Torr.Frequency stabilization circuit 6 is believed spectrum using Lock-in method
It number is converted into frequency stabilization error signal, in feedback to the current control of laser light source 1, realizes frequency stabilization.
In the present embodiment, 1 frequency of laser light source is ω, after fiber optic splitter 2, is divided in the ratio of 1:99, compared with
Weak light splitting p is the 1% of 1 general power of laser light source, is used for frequency stabilization, stronger light splitting s is 1 general power of laser light source
99%, it is used for fibre optic gyroscope.After light splitting s passes through fibre optic phase modulator 3, three frequency content ω and ω ± Δ ω are generated,
These three frequency contents are in communication band.Three frequency contents are by the way that after frequency-doubling crystal 4, frequency-doubling crystal 4 selects and itself
One frequency content (such as ω+Δ ω) of phase matched, by its frequency multiplication to the jump frequency of rubidium atom, other two frequency content
Still in communication band.Frequency multiplication is carried out to ω+Δ ω frequency content light in the present embodiment, the frequency being emitted from frequency-doubling crystal 4
Rate is the frequency doubled light of+2 Δ ω of 2 ω, is interacted after entering reflective integrated atom spectrum device 5 with atom vapor, is generated
Sub- Doppler's saturation-absorption spectrum signal.Other two frequency content with atom vapor due to that will not send out still in communication band
Raw interaction, therefore spectral signal is not interfered.Spectral signal is received by a photoelectric detector, and is converted into electric signal, and
Frequency stabilization circuit 6 is transferred to by harness.Frequency stabilization circuit 6 uses Lock-in method, applies one to the current control of laser light source 1
The Sine Modulated of a very little carries out small modulation to the frequency of laser light source 1, then the spectrum electricity that gained additional frequency is modulated
Signal is mixed with Sine Modulated itself, and removes the radio-frequency component in mixed frequency signal, filtered light by low-frequency wave
Frequency gradient electric signal, i.e. mistake needed for frequency stabilization will be generated at the absorption peak of corresponding hyperfine levels transition by composing electric signal
Difference signal.It is final to realize that the communication band based on Rubidium atomic spectrum swashs in error signal feedback to the current control of laser light source 1
The frequency stabilization of radiant 1.
In fact, if reflective integrated atom spectrum device 5 is using the atom spectrum of other structures (as sub- Doppler is inclined
Vibrational spectrum or Asia Doppler DAVLL spectrum), then frequency stabilization circuit 6 directly can also realize frequency stabilization using the methods of PID.
The above, a specific embodiment only of the invention, but scope of protection of the present invention is not limited thereto, appoints
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, all by what those familiar with the art
It is covered by the protection scope of the present invention.
The content that description in the present invention is not described in detail belongs to the well-known technique of professional and technical personnel in the field.
Claims (4)
1. the frequency regulator of fibre optic gyroscope communication band laser light source, it is characterised in that: including laser light source (1), optical fiber point
Beam device (2), frequency-doubling crystal (4), reflective integrated atom spectrum device (5) and frequency stabilization circuit (6), laser light source (1), optical fiber point
Beam device (2), frequency-doubling crystal (4) and reflective integrated atom spectrum device (5) pass sequentially through optical fiber connection, reflective integrated original
Sub-light spectral apparatus (5), frequency stabilization circuit (6), laser light source (1) pass sequentially through harness connection；
The fiber optic splitter (2) is used to be divided to obtain light splitting p and light splitting s to laser light source (1)；Frequency-doubling crystal (4) is used
In to light splitting p progress frequency multiplication；Reflective integrated atom spectrum device (5) realizes that frequency doubled light and atom vapor interact, and obtains
Sub- Doppler's saturation-absorption spectrum signal, and be translated into electric signal and export and give frequency stabilization circuit (6)；Frequency stabilization circuit (6) utilizes
Lock-in method handles received electric signal, obtains frequency stabilization signal, and feedback arrives in the current control of laser light source (1),
Realize that the closed loop frequency of communication band laser light source (1) is stablized；
The reflective integrated atom spectrum device (5) includes optical fiber interface (51), spectroscope (52), atomic air chamber (53), portion
Divide reflecting mirror (54), the first photodetector (55), the second photodetector (56) and magnetic screen wrapper (57)；Described
Two photodetectors (56), partially reflecting mirror (54), atomic air chamber (53), spectroscope (52) and the first photodetector (55) exist
It successively arranges in magnetic screen wrapper (57), and the second photodetector (56), reflecting mirror (54), atomic air chamber (53), light splitting
The center of mirror (52) and the first photodetector (55) is located at same optical axis, and magnetic screen wrapper (57) is for sealing whole light
Road；The optical fiber interface (51) is located at the side of spectroscope (52), and is fixed on magnetic screen wrapper (57), optical fiber interface
(51) and the center of spectroscope (52) is located at same optical axis；
The frequency doubled light is incident on spectroscope (52) through optical fiber interface (51), and spectroscope (52) is by the frequency doubled light of about 1/2 power
It reflects into atomic air chamber (53), interacts as pump light and atom vapor, the pumping transmitted from the atomic air chamber (53)
Light is partially reflected mirror (54) and reflects along original optical path, and the light of reflection is received and turned by the first photodetector (55) as detection light
Electric signal output is turned to, the transmitted light of partially reflecting mirror (54) is received and converted by the second photodetector (56) as reference light
For electric signal output.
2. frequency regulator according to claim 1, it is characterised in that: further include fibre optic phase modulator (3), the optical fiber
Phase-modulator (3) is connected between fiber optic splitter (2) and frequency-doubling crystal (4) by optical fiber, for carrying out phase to light splitting p
Modulation, obtains frequency band, and the frequency band passes through the frequency and atom spectrum jump frequency pair after frequency-doubling crystal (4) frequency multiplication
It answers.
3. frequency regulator according to claim 1, it is characterised in that: the splitting ratio of the fiber optic splitter (2) is 1:
99-1:9.
4. frequency regulator according to claim 1, it is characterised in that: the frequency stabilization circuit (6) receives the first photodetection
The electric signal of device (55) and the second photodetector (56) output, obtains subtraction signal as difference to received two electric signals, benefit
The subtraction signal is handled with Lock-in method, obtains frequency stabilization signal.
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| CN107546571A (en) * | 2017-07-31 | 2018-01-05 | 北京航天控制仪器研究所 | A kind of pump light frequency-stabilizing method for SERF atomic spin gyroscopes |
| CN109297581A (en) * | 2018-08-31 | 2019-02-01 | 南京大学 | It is a kind of for compensating the quadratic phase difference measurement method of frequency drift in phase sensitive optical time domain reflectometer |
| CN109270029B (en) * | 2018-09-29 | 2020-12-25 | 山西大学 | Universal NICE-OHMS system for detecting sub-Doppler spectrum |
| CN112113583B (en) * | 2020-09-29 | 2023-03-24 | 北京航天控制仪器研究所 | Closed-loop output real-time compensation system and method for nuclear magnetic resonance gyroscope |
| CN112615247B (en) * | 2020-12-16 | 2022-03-01 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Cold atom laser frequency stabilizing device |
| CN112945414B (en) * | 2021-01-19 | 2022-10-04 | 北京航空航天大学 | Atomic gas chamber temperature measurement system and method based on cross absorption peak speed selection |
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