CN106092079A - The frequency-stabilizing method of fibre optic gyroscope communication band LASER Light Source and frequency regulator - Google Patents
The frequency-stabilizing method of fibre optic gyroscope communication band LASER Light Source and frequency regulator Download PDFInfo
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- G01—MEASURING; TESTING
- 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 of fibre optic gyroscope communication band LASER Light Source and frequency regulator, this frequency-stabilizing method carries out light splitting to LASER Light Source, and more weak light is carried out phase-modulation and frequency multiplication, frequency doubled light is made to produce spectral signal with atomic interaction, obtain frequency stabilization signal after process and feed back to LASER Light Source, it is achieved frequency stabilization.Device includes LASER Light Source, fiber optic splitter, fibre optic phase modulator, frequency-doubling crystal, reflective integrated atomic spectrum device and frequency stabilization circuit.Fiber optic splitter is to LASER Light Source light splitting, fibre optic phase modulator and frequency-doubling crystal carry out phase-modulation and frequency multiplication to more weak light splitting, reflective integrated atomic spectrum device realizes frequency doubled light and atomic interaction, obtaining sub-Doppler's saturation-absorption spectrum signal of telecommunication, frequency stabilization circuit produces frequency stabilization error signal to spectrum Electric signal processing.The present invention solve the short-term jitter of fibre optic gyroscope LASER Light Source frequency and long time drifting problem, improve bias instaility and the constant multiplier stability of fibre optic gyroscope.
Description
Technical field
The present invention relates to field of inertia measurement, in particular to one for fibre optic gyroscope communication band laser light
The frequency-stabilizing method in source and frequency regulator.
Background technology
Fibre optic gyroscope is the solid-state of the Sagnac effect measurement object utilizing optical fiber loop rotation in inertial space
Inertia device, realizes rotational angle or the measurement of angular velocity by measuring moving interference fringes, and the inertia being important is led
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, by producing the shake unrelated with rotational angular velocity or drift, causes the defeated of fibre optic gyroscope
Go out signal and produce error.Typically stabilized lasers light is carried out by temperature and current control circuit in current fibre optic gyroscope design
The frequency in source, but during LASER Light Source frequency long, drift still cannot overcome.
Atomic spectrum is that the important method of stabilized lasers light source frequency, low cost, and technology are highly developed, it is possible to achieve
1MHz live width in short-term with laser frequency stabilization time long, solve the frequency jitter of LASER Light Source and drifting problem, in accurate measurement
There is extremely wide application in field.But, due to fibre optic gyroscope generally use be communication band (infrared band) swash
Radiant, and the spectrum of the neutral atom such as rubidium, potassium is respectively positioned near infrared band, it is difficult that this allows for atomic spectrum frequency stable technology
To be applied in fibre optic gyroscope.
All the time, the frequency stable sex chromosome mosaicism of fibre optic gyroscope LASER Light Source cannot effectively be solved, and seriously hinders
Hinder the raising of the main performance index such as fibre optic gyroscope bias instaility and constant multiplier stability, have impact on high-precision optical fiber
The development of gyroscope.
Summary of the invention
The technology of the present invention solves problem: overcome the deficiencies in the prior art, it is provided that a kind of for fibre optic gyroscope communication
The frequency-stabilizing method of wave band of laser light source and frequency regulator, solve fibre optic gyroscope LASER Light Source frequency long time drifting problem, carry
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, comprise the steps:
Step 1: LASER Light Source emergent light carries out light splitting and obtains light splitting p and light splitting s, the power of described light splitting p is weaker than point
Light s, light splitting s enter fibre optic gyroscope；
Step 2: light splitting p is carried out phase-modulation and frequency multiplication, obtains the frequency doubled light of atomic spectrum jump frequency；
Step 3: make frequency doubled light produce spectral signal with atomic interaction；
Step 4: spectral signal is carried out process and obtains frequency stabilization signal, feeds back in the electric current control of LASER Light Source, it is achieved
The closed loop frequency of communication band LASER Light Source is stable.
There is frequency multiplication relation in the centre wavelength of described LASER Light Source and the transition wavelength of atomic spectrum.
The frequency regulator of described frequency-stabilizing method, including LASER Light Source, fiber optic splitter, frequency-doubling crystal, reflective integrated former
Sub-spectral device and frequency stabilization circuit, LASER Light Source, fiber optic splitter, frequency-doubling crystal and atomic spectrum unit pass sequentially through optical fiber
Connecting, reflective integrated atomic spectrum device, frequency stabilization circuit, LASER Light Source pass sequentially through wire harness and connect；
Described fiber optic splitter obtains light splitting p and light splitting s for LASER Light Source is carried out light splitting；Frequency-doubling crystal is for dividing
Light p carries out frequency multiplication；Reflective integrated atomic spectrum device realizes frequency doubled light and interacts with atom vapor, obtains sub-Doppler and satisfies
With absorption spectrum signal, and it is translated into the signal of telecommunication and exports to frequency stabilization circuit；Frequency stabilization circuit utilizes Lock-in method to reception
The signal of telecommunication process, obtain frequency stabilization signal, feed back to LASER Light Source electric current control on, it is achieved communication band LASER Light Source
Closed loop frequency stable.
Also include that fibre optic phase modulator, described fibre optic phase modulator are connected to fiber optic splitter and frequency multiplication by optical fiber
Between crystal, for light splitting p is carried out phase-modulation, obtaining frequency band, described frequency band is by after frequency-doubling crystal frequency multiplication
Frequency corresponding with atomic spectrum jump frequency.
Described reflective integrated atomic spectrum device include optical fiber interface, spectroscope, atomic air chamber, partially reflecting mirror,
One photodetector, the second photodetector and magnetic shield wrapper；Described second photodetector, partially reflecting mirror, former
Edema of the legs during pregnancy room, spectroscope and the first photodetector are arranged in magnetic shield wrapper successively, and the second photodetector, reflection
Mirror, atomic air chamber, spectroscope and the first photodetector are centrally located at same optical axis, and magnetic shield wrapper is used for sealing all
Light path；Described optical fiber interface is positioned at spectroscopical side, and is fixed on magnetic shield wrapper, optical fiber interface and spectroscopical in
The heart is positioned at same optical axis；
Described frequency doubled light incides on spectroscope through optical fiber interface, and the frequency doubled light of about 1/2 power is reflected into former by spectroscope
Edema of the legs during pregnancy room, interacts with atom vapor as pump light, is partially reflected mirror edge from the pump light of described atomic air chamber transmission
Original optical path reflects, and the light of reflection is received and be converted into signal of telecommunication output as detection light by the first photodetector, partially reflective
The transmission light of mirror is received and is converted into signal of telecommunication output as reference light by the second photodetector.
The splitting ratio of described fiber optic splitter is 1:99 1:9.
Described frequency stabilization circuit receives the first photodetector and the signal of telecommunication of the second photodetector output, to two received
The individual signal of telecommunication is made difference and is obtained subtraction signal, utilizes Lock-in method to process this subtraction signal, obtains frequency stabilization signal.
The present invention compared with prior art has the advantages that
(1) the inventive method and device are achieved fibre optic gyroscope infrared communication wave band of laser light source by frequency doubling technology
Near-infrared atomic spectrum frequency stable, solve the short-term jitter of LASER Light Source frequency and long time drifting problem, improve light
The bias instaility of fiber gyroscope and constant multiplier stability, promote the development of high-precision optical fiber gyro instrument.
(2) present invention realize the device optic fibre light path independent of fibre optic gyroscope, farthest inhibit optical fiber top
The increase of spiral shell instrument noise source, greatly reduces the impact on fibre optic gyroscope optic fibre light path stability of the newly-increased frequency stabilization light path.
(3) the inventive method 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 can not be directly by frequency multiplication to atomic spectrum transition frequency after frequency-doubling crystal at the emergent light of LASER Light Source
In the case of rate, using fibre optic phase modulator that light splitting p is carried out phase-modulation, it is right to obtain by producing after frequency-doubling crystal frequency multiplication
Answer the frequency band of atomic spectrum jump frequency, it is ensured that the method and device are to the effectiveness of stabilized lasers light source frequency and can
By property.
(5) present invention realize device uses reflective integrated atomic spectrum device, this atomic spectrum device uses anti-
Penetrating formula light path replaces the beam splitting of conventional atom spectrum to close beam optical path, has significantly simplified optical element, has decreased noise source, has reduced
The spatial volume of atomic spectrum, significantly improves stability and the integration of atomic spectrum frequency stable.
Accompanying drawing explanation
Fig. 1 is that the present invention realizes device schematic diagram；
Fig. 2 is the reflective integrated atomic spectrum device schematic diagram of the present invention.
Detailed description of the invention
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings:
The present invention, from atomic spectrum frequency stable technology, proposes one for fibre optic gyroscope communication band laser light
The frequency-stabilizing method in source and realize device, by frequency doubling technology achieve fibre optic gyroscope infrared communication wave band of laser light source near
Infrared atomic spectrum frequency stable.
The frequency-stabilizing method of fibre optic gyroscope communication band LASER Light Source, comprises the steps:
Step 1: LASER Light Source 1 carrying out light splitting and obtains light splitting p and light splitting s, the power of described light splitting p is weaker than light splitting s, point
Light s enters fibre optic gyroscope.
Step 2: light splitting p is carried out phase-modulation and frequency multiplication, obtains the frequency doubled light of atomic spectrum jump frequency.
Step 3: make frequency doubled light produce spectral signal with atomic interaction.
Step 4: utilize frequency stabilization electronic technology that spectral signal is carried out process and obtain frequency stabilization signal, feed back to LASER Light Source 1
Electric current control on, it is achieved the closed loop frequency of communication band LASER Light Source 1 is stable.
There is frequency multiplication relation in the centre wavelength of LASER Light Source 1 and the transition wavelength of atomic spectrum, the atom of step 3 uses
Rubidium atom or potassium atom realize, if the atom of i.e. step 3 uses rubidium atom, then LASER Light Source 1 centre wavelength is
1560nm, step 2 obtains the frequency doubled light that wavelength is 780nm after carrying out frequency multiplication.If it is former that the atom of step 3 uses potassium
Son, then LASER Light Source 1 centre wavelength is 1534nm, and step 2 obtains the frequency doubled light that wavelength is 767nm after carrying out frequency multiplication.
Above-mentioned frequency-stabilizing method realize device, including LASER Light Source 1, fiber optic splitter 2, fibre optic phase modulator 3, frequency multiplication
Crystal 4, reflective integrated atomic 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 atomic spectrum device 5 pass sequentially through optical fiber connection, reflective integrated atomic spectrum device
5, frequency stabilization circuit 6, LASER Light Source 1 pass sequentially through wire harness and connect.The splitting ratio of fiber optic splitter 2 is 1:99-1:9, for swashing
Radiant 1 carries out light splitting, obtains light splitting p and light splitting s.Fibre optic phase modulator 3, for light splitting p is carried out phase-modulation, produces
Frequency band, the frequency correspondence atomic spectrum jump frequency after this frequency band frequency multiplication.Frequency-doubling crystal 4 for light splitting p or its
Sideband carries out frequency multiplication.Frequency doubled light interacts with atom vapor in reflective integrated atomic spectrum device 5, produces sub-Doppler
Saturation-absorption spectrum optical signal, and converted optical signal into the signal of telecommunication by reflective integrated atomic spectrum device 5 and export to frequency stabilization
Circuit 6.
Reflective integrated atomic spectrum device 5 uses the reflection of sub-Doppler's saturation-absorption spectrum of band optical fiber interface integrated
Device realizes.The 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 the 54, first photodetector the 55, second photodetector 56 and magnetic shield encapsulation
Device 57.Spectroscope 52, atomic air chamber 53, partially reflecting mirror the 54, first photodetection the 55, second photodetector 56 are positioned at magnetic cup
Cover in wrapper 57, seal whole light path by magnetic shield wrapper 57；Optical fiber interface 51 is fixed on magnetic shield wrapper 57.
Wherein the second photodetector 56, partially reflecting mirror 54, atomic air chamber 53, spectroscope 52 and the first photodetector 55 are arranged successively
Cloth, and the second photodetector 56, reflecting mirror 54, atomic air chamber 53, spectroscope 52 and the centre bit of the first photodetector 55
In same optical axis, optical fiber interface 51 is positioned at the side of spectroscope 52, and optical fiber interface 51 and spectroscope 52 are centrally located at same
Optical axis.Frequency doubled light enters magnetic shield wrapper 57 by optical fiber through optical fiber interface 51, and spectroscope 52 is by the frequency doubled light of about 1/2 power
Reflect into atomic air chamber 53, interact with atom vapor as pump light, by population corresponding hyperfine of resonance absorption line
Atom pumping in structure energy level ground state is fallen so that atom vapor produces non-linear hole burning to the absorption of pump light.From atom gas
The pump light of room 53 transmission is partially reflected mirror 54 and reflects along original optical path, the hole burning spectroscopically detectable to atom vapor, is to visit
Light-metering.Detect and received by the first photodetector 55 after light returns along original optical path and atomic spectrum optical signal is converted into telecommunications
Number, the transmission light of partially reflecting mirror 54 is received as reference light by the second photodetector 56 and is converted into the signal of telecommunication.First light
The signal of telecommunication of electric explorer 55 and the second photodetector 56 is spread out of to frequency stabilization circuit 6 by wire harness, and frequency stabilization circuit 6 is to the two
The signal of telecommunication is poor, and carries out Lock-in frequency stable based on this subtraction signal.The magnetic shield encapsulation 57 whole light paths of sealing,
Optical fiber interface 51 is fixed in magnetic shield encapsulation 57.
Frequency stabilization circuit 6 uses Lock-in method.Detailed process is, the electric current of LASER Light Source 1 is controlled to execute by frequency stabilization circuit 6
Add a Sine Modulated the least, the i.e. frequency to LASER Light Source 1 and carry out small modulation, then light gained additional frequency modulated
The spectrum signal of telecommunication (the first photodetector and the subtraction signal that obtains as after the recovery of the signal of telecommunication of the second photodetector output) with just
String modulation is mixed itself, and is removed the radio-frequency component in mixed frequency signal by low-frequency wave, the filtered spectrum signal of telecommunication
The error signal needed for the frequency gradient signal of telecommunication, i.e. frequency stable will be produced at the absworption peak of corresponding hyperfine levels transition
(frequency stabilization signal).Typically stable frequency configuration will be needed in the position of frequency gradient signal of telecommunication zero passage, any frequency changes all
The electric current feeding back to LASER Light Source 1 with the change in voltage form of a big slope controls, and is drawn by the voltage of the frequency gradient signal of telecommunication
Returned zero position, will the frequency of LASER Light Source 1 retract by stable frequency location, thus realize based on near-infrared rubidium or potassium
The closed loop frequency of the infrared communication wave band of laser light source 1 of atomic spectrum is stable.
Emergent light at LASER Light Source 1 can be directly by the situation of frequency multiplication to atomic spectrum jump frequency through frequency-doubling crystal 4
Under, frequency regulator can not use fibre optic phase modulator 3.
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 as a example by, LASER Light Source 1 centre wavelength is 1560nm, and the splitting ratio of fiber optic splitter 2 is 1:99.Optical fiber phase
Position manipulator 3 uses Thorlabs LN53S-FC, for 10GHz LiNbO3Crystalline phase manipulator, FC/PC optical fiber interface.Times
Frequently crystal 4 uses PPLN (the Periodically-poled lithium niobate) crystal unit being applicable to optic fibre light path,
By the Absorption Line wavelength 780nm of 1560nm frequency multiplication to rubidium and potassium atom.Reflective integrated atomic spectrum device 5 uses band optical fiber to connect
The reflection integrating device of sub-Doppler's saturation-absorption spectrum of mouth, physical dimension is 15mm × 15mm × 20mm, this kind of atom light
The impact of frequency stabilization signal not Stimulated Light light source 1 polarization state of spectrum, the atomic air chamber used is 1000mm3Quartz glass chamber, interior
Encapsulation rubidium atom vapor, but do not add buffer gas, pressure 10-7Torr.Frequency stabilization circuit 6 uses Lock-in method to be believed by spectrum
Number it is converted into frequency stabilization error signal, feeds back on the electric current of LASER Light Source 1 controls, it is achieved frequency stable.
In the present embodiment, LASER Light Source 1 frequency is ω, after fiber optic splitter 2, in the ratio light splitting of 1:99, relatively
Weak light splitting p is the 1% of LASER Light Source 1 general power, and for frequency stable, stronger light splitting s is LASER Light Source 1 general power
99%, for fibre optic gyroscope.After light splitting s passes through fibre optic phase modulator 3, produce three frequency contents ω and ω ± Δ ω,
These three frequency content is in communication band.Three frequency contents are by after frequency-doubling crystal 4, and frequency-doubling crystal 4 selects and self
One frequency content (such as ω+Δ ω) of phase matched, by the jump frequency of its frequency multiplication to rubidium atom, other two frequency content
Still in communication band.In the present embodiment the light of ω+Δ ω frequency content is carried out frequency multiplication, from the frequency of frequency-doubling crystal 4 outgoing
Rate is the frequency doubled light of 2 ω+2 Δ ω, interacts with atom vapor, produce after entering reflective integrated atomic spectrum device 5
Sub-Doppler's saturation-absorption spectrum signal.Other two frequency content is owing to still in communication band, will not send out with atom vapor
Raw interaction, does not interferes spectral signal.Spectral signal is received by a photoelectric detector, and is converted into the signal of telecommunication, and
It is transferred to frequency stabilization circuit 6 by wire harness.Frequency stabilization circuit 6 uses Lock-in method, and the electric current of LASER Light Source 1 is controlled applying one
The least individual Sine Modulated, the i.e. frequency to LASER Light Source 1 carry out small modulation, then spectrum electricity gained additional frequency modulated
Signal and Sine Modulated are mixed itself, and are removed the radio-frequency component in mixed frequency signal by low-frequency wave, filtered light
The spectrum signal of telecommunication will produce the mistake needed for the frequency gradient signal of telecommunication, i.e. frequency stable at the absworption peak of corresponding hyperfine levels transition
Difference signal.Error signal feeds back in the electric current control of LASER Light Source 1, and final realization communication band based on Rubidium atomic spectrum swashs
The frequency stable of radiant 1.
If it is true that the atomic spectrum that reflective integrated atomic spectrum device 5 uses other structures is (as inclined in sub-Doppler
Vibrational spectrum or sub-Doppler's DAVLL spectrum), then frequency stabilization circuit 6 can also directly use the methods such as PID to realize frequency stable.
The above, only one detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, and appoints
How those familiar with the art is in the technical scope that the invention discloses, the change that can readily occur in or replacement, all
Should contain within protection scope of the present invention.
The content not being described in detail in description of the invention belongs to the known technology of professional and technical personnel in the field.
Claims (7)
1. the frequency-stabilizing method of fibre optic gyroscope communication band LASER Light Source, it is characterised in that comprise the steps:
Step 1: LASER Light Source (1) emergent light carrying out light splitting and obtains light splitting p and light splitting s, the power of described light splitting p is weaker than light splitting
S, light splitting s enter fibre optic gyroscope；
Step 2: light splitting p is carried out phase-modulation and frequency multiplication, obtains the frequency doubled light of atomic spectrum jump frequency；
Step 3: make frequency doubled light produce spectral signal with atomic interaction；
Step 4: spectral signal is carried out process and obtains frequency stabilization signal, feeds back in the electric current control of LASER Light Source (1), it is achieved logical
The closed loop frequency of news wave band of laser light source (1) is stable.
Frequency-stabilizing method the most according to claim 1, it is characterised in that: the centre wavelength of described LASER Light Source (1) and atom
There is frequency multiplication relation in the transition wavelength of spectrum.
3. the frequency regulator of frequency-stabilizing method as claimed in claim 2, it is characterised in that: include LASER Light Source (1), fiber optic splitter
(2), frequency-doubling crystal (4), reflective integrated atomic spectrum device (5) and frequency stabilization circuit (6), LASER Light Source (1), fiber optic splitter
(2), frequency-doubling crystal (4) and atomic spectrum unit (5) pass sequentially through optical fiber and connect, reflective integrated atomic spectrum device (5),
Frequency stabilization circuit (6), LASER Light Source (1) pass sequentially through wire harness and connect；
Described fiber optic splitter (2) obtains light splitting p and light splitting s for LASER Light Source (1) is carried out light splitting；Frequency-doubling crystal (4) is used
In light splitting p is carried out frequency multiplication；Reflective integrated atomic spectrum device (5) realizes frequency doubled light and interacts with atom vapor, obtains
Sub-Doppler's saturation-absorption spectrum signal, and be translated into the signal of telecommunication and export to frequency stabilization circuit (6)；Frequency stabilization circuit (6) utilizes
The signal of telecommunication received is processed by Lock-in method, obtains frequency stabilization signal, feeds back in the electric current control of LASER Light Source (1),
The closed loop frequency realizing communication band LASER Light Source (1) is stable.
Frequency regulator the most according to claim 3, it is characterised in that: also include fibre optic phase modulator (3), described optical fiber
Phase-modulator (3) is connected between fiber optic splitter (2) and frequency-doubling crystal (4) by optical fiber, for light splitting p is carried out phase place
Modulation, obtains frequency band, and described frequency band is by the frequency after frequency-doubling crystal (4) frequency multiplication and atomic spectrum jump frequency pair
Should.
Frequency regulator the most according to claim 3, it is characterised in that: described reflective integrated atomic spectrum device (5) is wrapped
Include optical fiber interface (51), spectroscope (52), atomic air chamber (53), partially reflecting mirror (54), the first photodetector (55), second
Photodetector (56) and magnetic shield wrapper (57)；Described second photodetector (56), partially reflecting mirror (54), atom
Air chamber (53), spectroscope (52) and the first photodetector (55) are arranged in magnetic shield wrapper (57) successively, and the second light
Electric explorer (56), reflecting mirror (54), atomic air chamber (53), spectroscope (52) and the first photodetector (55) are centrally located at
Same optical axis, magnetic shield wrapper (57) is used for sealing whole light path；Described optical fiber interface (51) is positioned at the one of spectroscope (52)
Side, and be fixed on magnetic shield wrapper (57), optical fiber interface (51) and spectroscope (52) are centrally located at same optical axis；
Described frequency doubled light incides on spectroscope (52) through optical fiber interface (51), and spectroscope (52) is by the frequency doubled light of about 1/2 power
Reflect into atomic air chamber (53), interact with atom vapor as pump light, from the pumping of described atomic air chamber (53) transmission
Light is partially reflected mirror (54) and reflects along original optical path, and the light of reflection is received by the first photodetector (55) as detecting light and turns
Turning to signal of telecommunication output, the transmission light of partially reflecting mirror (54) is received as reference light by the second photodetector (56) and converts
Export for the signal of telecommunication.
Frequency regulator the most according to claim 3, it is characterised in that: the splitting ratio of described fiber optic splitter (2) is 1:
99 1:9.
Frequency regulator the most according to claim 3, it is characterised in that: described frequency stabilization circuit (6) receives the first photodetection
Two signals of telecommunication received are made difference and are obtained subtraction signal by the signal of telecommunication that device (55) and the second photodetector (56) export, profit
By Lock-in method, this subtraction signal is processed, obtain 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 |
| CN109270029A (en) * | 2018-09-29 | 2019-01-25 | 山西大学 | It is a kind of for detecting the general NICE-OHMS system of sub- Doppler's spectrum |
| CN109270029B (en) * | 2018-09-29 | 2020-12-25 | 山西大学 | Universal NICE-OHMS system for detecting sub-Doppler spectrum |
| CN112113583A (en) * | 2020-09-29 | 2020-12-22 | 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 |
| CN112615247A (en) * | 2020-12-16 | 2021-04-06 | 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 |
| CN112945414A (en) * | 2021-01-19 | 2021-06-11 | 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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| CN106092079B (en) | 2019-07-12 |
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