CN107845951A - Laser frequency power bistable system and method for magnetic resonance gyroscope instrument - Google Patents
Laser frequency power bistable system and method for magnetic resonance gyroscope instrument Download PDFInfo
- Publication number
- CN107845951A CN107845951A CN201711158150.5A CN201711158150A CN107845951A CN 107845951 A CN107845951 A CN 107845951A CN 201711158150 A CN201711158150 A CN 201711158150A CN 107845951 A CN107845951 A CN 107845951A
- Authority
- CN
- China
- Prior art keywords
- laser
- signal
- frequency
- power
- deviation direction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000004065 semiconductor Substances 0.000 claims abstract description 58
- 238000001914 filtration Methods 0.000 claims abstract description 45
- 230000006641 stabilisation Effects 0.000 claims abstract description 38
- 238000011105 stabilization Methods 0.000 claims abstract description 38
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 27
- 230000003287 optical effect Effects 0.000 claims abstract description 20
- 238000005481 NMR spectroscopy Methods 0.000 claims description 26
- 238000009499 grossing Methods 0.000 claims description 22
- 238000010521 absorption reaction Methods 0.000 claims description 16
- 238000005070 sampling Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 8
- 150000001340 alkali metals Chemical class 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 7
- 230000010287 polarization Effects 0.000 claims description 7
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 229910052783 alkali metal Inorganic materials 0.000 claims description 5
- 238000011896 sensitive detection Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000004069 differentiation Effects 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 3
- 238000005057 refrigeration Methods 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 abstract description 3
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/06808—Stabilisation of laser output parameters by monitoring the electrical laser parameters, e.g. voltage or current
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
- Gyroscopes (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of laser frequency power bistable system and method for magnetic resonance gyroscope instrument, wherein, the laser frequency power bistable system, including：Laser optical system, laser frequency stabilization rate system and laser power stabilizing system；Laser optical system, for based on semiconductor laser device, exporting transmitted light and the first current signal；Laser frequency stabilization rate system, for being detected to transmitted light, transmitted light is converted into the first filtering signal；According to the phase difference between sinusoidal reference signal and the first filtering signal, laser frequency stabilization rate is realized；Laser power stabilizing system, for being detected to the first current signal, first current signal is converted into the second filtering signal；According to second filtering signal, laser power offset direction is obtained；Based on laser power offset direction, laser power stabilizing is realized.The Dual Stabilization of laser power and frequency is realized by the present invention.
Description
Technical Field
The invention belongs to the technical field of nuclear magnetic resonance gyroscope lasers, and particularly relates to a laser frequency power bistable system and a laser frequency power bistable method.
Background
The micro nuclear magnetic resonance gyroscope has the characteristics of small volume, low power consumption, large dynamic range and the like, and has become a research focus and a hot spot of a novel inertia device. The performance of a nuclear magnetic resonance gyroscope is affected by the macroscopic magnetic moment of the nuclear spins and is directly related to the density of the alkali metal atoms being polarized. The frequency and power stability of the laser directly affect the density of the polarized alkali metal atoms, if the frequency or power fluctuation of the laser is large, the alkali metal polarization rate is caused to generate large fluctuation, and the final measurement precision is further affected; that is, the fluctuation of laser frequency and power directly affects the change of macroscopic nuclear spin magnetic moment, and finally affects the performance of the gyroscope.
In order to reduce the system volume, the nmr gyroscope usually employs a DBR (Distributed bragg reflector) semiconductor laser with a small volume. Because the length of the resonant cavity cannot be directly adjusted, the laser frequency and power can be controlled only by adjusting the temperature and current of the laser.
At present, a commonly adopted nuclear magnetic resonance gyroscope adopts a linear absorption frequency stabilization technology, and laser frequency can be locked on an absorption peak by adjusting laser driving current, however, when laser temperature changes, laser power can drift, and the precision of the nuclear magnetic resonance gyroscope is influenced.
Disclosure of Invention
The technical problem of the invention is solved: the defects of the prior art are overcome, and a laser frequency power bistable system and a laser frequency power bistable method for a nuclear magnetic resonance gyroscope are provided, so that double stabilization of laser power and frequency is realized.
In order to solve the technical problem, the invention discloses a laser frequency power bistable system for a nuclear magnetic resonance gyroscope, which comprises: the system comprises a laser optical path system, a laser frequency stabilizing system and a laser power stabilizing system; wherein, the laser optical path system includes: a semiconductor laser device; the laser frequency stabilization system comprises: a constant current source;
a laser optical path system for outputting a transmission light and a first current signal based on the semiconductor laser device;
the laser frequency stabilization system is used for detecting the transmitted light and converting the transmitted light into a first filtering signal; obtaining a laser frequency deviation direction according to the phase difference between the sine wave reference signal and the first filtering signal; reversely adjusting the driving current generated by the constant current source according to the deviation direction of the laser frequency, and stabilizing the frequency of the semiconductor laser device at the central frequency of an absorption peak;
the laser power stabilizing system is used for detecting a first current signal and converting the first current signal into a second filtering signal; obtaining a laser power deviation direction according to the second filtering signal; reversely adjusting the temperature of the semiconductor laser device according to the deviation direction of the laser power, and further reversely adjusting the driving current generated by the constant current source to realize the power stabilization of the laser;
and the constant current source is used for generating driving current and adjusting the light-emitting intensity of the semiconductor laser device.
In the laser frequency power bistable system for a nuclear magnetic resonance gyroscope, the laser optical path system further includes: the device comprises a TEC temperature controller, a lens, a 1/4 glass slide and an atom gas chamber; wherein,
the TEC temperature controller is used for controlling the temperature of the semiconductor laser device;
the semiconductor laser device is used for outputting linearly polarized laser meeting set power and set frequency under the temperature control of the TEC temperature controller; converting the linear polarization laser into a first current signal and outputting the first current signal;
the lens is used for collimating the linearly polarized laser output by the semiconductor laser device;
1/4 glass slide for converting the collimated linear polarization laser into circular polarization light;
an atomic gas chamber for reacting the alkali metal in the atomic gas chamber under the action of the circularly polarized light87Rb is polarized to output polarized transmitted light.
In the laser frequency power bistable system for a nuclear magnetic resonance gyroscope, the semiconductor laser device includes: the TEC semiconductor refrigerator, the laser, the NTC thermistor and the backlight diode;
the TEC semiconductor refrigerator is used for heating or refrigerating the laser under the temperature control of the TEC temperature controller;
the laser is used for outputting linearly polarized laser meeting set power and set frequency under the heating or refrigeration of the TEC semiconductor refrigerator;
the NTC thermistor is used for detecting and feeding back the temperature of the laser;
and the backlight diode is used for converting the linearly polarized laser output by the laser into a first current signal.
In the laser frequency power bistable system for a nuclear magnetic resonance gyroscope described above,
setting power, comprising: 10 mW;
setting a frequency, comprising: at a frequency of87Rb first line within allowable error; wherein the allowable error is: 0.5 nm;
the resistance of the NTC thermistor comprises: 10k omega.
In the laser frequency power bistable system for a nuclear magnetic resonance gyroscope, the laser frequency stabilization system further includes: the device comprises a photoelectric detector, a first I-V amplifying circuit, a first ADC (analog to digital converter) acquisition circuit, a first smoothing filter, a first PID (proportion integration differentiation) controller and a signal generator;
the photoelectric detector is used for detecting the transmitted light output by the laser optical path system and converting the transmitted light into a second current signal;
the first I-V amplifying circuit is used for amplifying the second current signal and converting the amplified second current signal into a voltage signal;
the first ADC acquisition circuit is used for periodically sampling the voltage signal output by the first I-V amplification circuit to obtain a digital signal;
the first smoothing filter is used for carrying out low-pass filtering processing on the digital signal output by the first ADC acquisition circuit to obtain a first filtered signal;
a signal generator for generating and outputting a sine wave reference signal;
the first PID controller is used for detecting the phase difference between the sine wave reference signal and the first filtering signal by adopting a phase-sensitive detection algorithm to obtain the laser frequency deviation direction; and reversely adjusting the driving current generated by the constant current source according to the deviation direction of the laser frequency, and stabilizing the frequency of the semiconductor laser device at the central frequency of the absorption peak.
In the laser frequency power bistable system for a nuclear magnetic resonance gyroscope, the laser power stabilizing system includes: the second I-V amplifying circuit, the second ADC acquisition circuit, the second smoothing filter and the second PID controller;
the second I-V amplifying circuit is used for detecting the first current signal output by the laser optical path system, amplifying the first current signal and converting the amplified first current signal into a voltage signal;
the second ADC acquisition circuit is used for periodically sampling the voltage signal output by the second I-V amplification circuit to obtain a digital signal;
the second smoothing filter is used for carrying out low-pass filtering processing on the digital signal output by the second ADC acquisition circuit to obtain a second filtered signal;
the second PID controller is used for obtaining the laser power deviation direction according to the second filtering signal; and reversely adjusting the temperature of the semiconductor laser device according to the deviation direction of the laser power, and further reversely adjusting the driving current generated by the constant current source to realize the power stabilization of the laser.
Correspondingly, the invention also discloses a laser frequency power bistable method for the nuclear magnetic resonance gyroscope, which comprises the following steps:
outputting the transmitted light and a first current signal based on the semiconductor laser device;
detecting transmitted light, and converting the transmitted light into a first filtering signal; obtaining a laser frequency deviation direction according to the phase difference between the sine wave reference signal and the first filtering signal; reversely adjusting the driving current generated by the constant current source according to the deviation direction of the laser frequency, and stabilizing the frequency of the semiconductor laser device at the central frequency of an absorption peak;
detecting a first current signal, and converting the first current signal into a second filtered signal; obtaining a laser power deviation direction according to the second filtering signal; and reversely adjusting the temperature of the semiconductor laser device according to the deviation direction of the laser power, and further reversely adjusting the driving current generated by the constant current source to realize the power stabilization of the laser.
The invention has the following advantages:
(1) on the basis of laser linear absorption frequency stabilization, the invention acquires the change of laser power by collecting the output signal of the photoelectric detector in the laser, and adjusts the temperature of the laser to realize the stabilization of the laser output power, and finally realizes the dual stabilization of the laser power and the laser frequency.
(2) In the invention, the temperature sampling frequency of the TEC temperature controller and various parameters of the PID controller are adjustable, the realization is simple, and the precision is higher.
(3) In the invention, modules such as the I-V amplifying circuit, the ADC acquisition circuit, the smoothing filter, the PID controller and the like can be multiplexed, thereby reducing the complexity of the system.
Drawings
FIG. 1 is a block diagram of a laser frequency power bi-stable system for a nuclear magnetic resonance gyroscope according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a laser frequency power bi-stable system for a nmr gyroscope according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, common embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, a block diagram of a laser frequency power bi-stable system for a nuclear magnetic resonance gyroscope according to an embodiment of the present invention is shown. In this embodiment, the laser frequency power bi-stable system for a nuclear magnetic resonance gyroscope includes: the laser comprises a laser optical path system, a laser frequency stabilizing system and a laser power stabilizing system. Wherein, the laser optical path system includes: a semiconductor laser device; the laser frequency stabilization system comprises: a constant current source; the constant current source is used for generating driving current and adjusting the light-emitting intensity of the semiconductor laser device. In this embodiment:
the laser optical path system is used for outputting the transmission light and the first current signal based on the semiconductor laser device.
The laser frequency stabilization system is used for detecting the transmitted light and converting the transmitted light into a first filtering signal; obtaining a laser frequency deviation direction according to the phase difference between the sine wave reference signal and the first filtering signal; and reversely adjusting the driving current generated by the constant current source according to the deviation direction of the laser frequency, and stabilizing the frequency of the semiconductor laser device at the central frequency of the absorption peak.
The laser power stabilizing system is used for detecting a first current signal and converting the first current signal into a second filtering signal; obtaining a laser power deviation direction according to the second filtering signal; and reversely adjusting the temperature of the semiconductor laser device according to the deviation direction of the laser power, and further reversely adjusting the driving current generated by the constant current source to realize the power stabilization of the laser.
Referring to fig. 2, a schematic circuit diagram of a laser frequency power bistable system for a nuclear magnetic resonance gyroscope according to an embodiment of the present invention is shown.
In a preferred embodiment of the present invention, with reference to fig. 1 and fig. 2, the laser optical path system further includes: TEC temperature controller, lens, 1/4 glass slide and atom gas chamber. Wherein:
and the TEC temperature controller is used for controlling the temperature of the semiconductor laser device.
The semiconductor laser device is used for outputting linearly polarized laser meeting set power and set frequency under the temperature control of the TEC temperature controller; and converting the linearly polarized laser into a first current signal and outputting the first current signal.
And the lens is used for collimating the linearly polarized laser light output by the semiconductor laser device.
And the 1/4 glass slide is used for converting the collimated linearly polarized laser into circularly polarized light.
An atomic gas chamber for reacting the alkali metal in the atomic gas chamber under the action of the circularly polarized light87Rb is polarized to output polarized transmitted light.
Further, in this embodiment, the semiconductor laser device may specifically include: TEC semiconductor cooler, laser, NTC thermistor and backlight diode. Wherein:
and the TEC semiconductor refrigerator is used for heating or refrigerating the laser under the temperature control of the TEC temperature controller.
And the laser is used for outputting linearly polarized laser meeting the set power and the set frequency under the heating or refrigeration of the TEC semiconductor refrigerator.
In this embodiment, the laser may be heated or cooled by the TEC semiconductor cooler, and has an output power of 10mW (set power) and a frequency of 10mW87Linearly polarized laser light within the allowed error range of the Rb first line (i.e., 795nm + -0.5 nm); the linearly polarized laser is collimated by a lens and then converted into circularly polarized light by a 1/4 glass slide, and the circularly polarized light is used for polarizing alkali metals in an atomic gas chamber87Rb, residual laser (transmitted light) laser frequency stabilization systemAnd (6) collecting.
And the NTC thermistor is used for detecting and feeding back the temperature of the laser. The resistance of the NTC thermistor may be 10k Ω.
And the backlight diode is used for converting the linearly polarized laser output by the laser into a first current signal.
In a preferred embodiment of the present invention, with reference to fig. 1 and fig. 2, the laser frequency stabilization system further includes: the device comprises a photoelectric detector, a first I-V amplifying circuit, a first ADC (analog to digital converter) acquisition circuit, a first smoothing filter, a first PID (proportion integration differentiation) controller and a signal generator. Wherein:
and the photoelectric detector is used for detecting the transmitted light output by the laser optical path system and converting the transmitted light into a second current signal.
And the first I-V amplifying circuit is used for amplifying the second current signal and converting the amplified second current signal into a voltage signal.
And the first ADC acquisition circuit is used for periodically sampling the voltage signal output by the first I-V amplification circuit to obtain a digital signal.
And the first smoothing filter is used for carrying out low-pass filtering processing on the digital signal output by the first ADC acquisition circuit to obtain a first filtered signal.
And the signal generator is used for generating and outputting the sine wave reference signal.
In this embodiment, the signal generator may generate a sine wave signal based on a DDS signal generating module inside the FPGA, and modulate the constant current source to make the driving current generated by the constant current source slightly change, so that the light intensity of the laser slightly changes.
The first PID controller is used for detecting the phase difference between the sine wave reference signal and the first filtering signal by adopting a phase-sensitive detection algorithm to obtain the laser frequency deviation direction; and reversely adjusting the driving current generated by the constant current source according to the deviation direction of the laser frequency, and stabilizing the frequency of the semiconductor laser device at the central frequency of the absorption peak.
In this embodiment, after the laser frequency stabilization system receives the transmitted light, a tiny current signal is generated according to the intensity of the transmitted light, the current signal is converted into a voltage signal after being amplified, the voltage signal is periodically sampled, and smooth filtering is performed to obtain a relatively accurate light intensity signal.
When the laser is positioned at the central frequency of the absorption peak, the frequency of a light intensity signal generated by the laser frequency stabilization system is twice of the laser modulation frequency, and the phase difference between the light intensity signal generated by the laser frequency stabilization system and the laser modulation signal is zero; when the laser deviates from the central frequency of the absorption peak, the sine wave reference signal and the light intensity signal generate phase difference, at the moment, the sine wave reference signal generated by the signal generator and the light intensity signal passing through the smoothing filter are multiplied by adopting a phase-sensitive detection algorithm, integral operation is carried out, the deviation direction of the laser frequency is detected, and the driving current generated by the constant current source is reversely adjusted by the first PID controller, so that the frequency of the laser is further close to the frequency of the laser87Near the first line of Rb, i.e. near 795nm, laser stabilization is achieved. The integral operation has two functions: firstly, filtering out a double-frequency signal generated after multiplication to obtain a low-frequency phase difference signal; secondly, high-frequency noise is filtered.
In a preferred embodiment of the present invention, with reference to fig. 1 and 2, the laser power stabilizing system includes: the second I-V amplifying circuit, the second ADC acquisition circuit, the second smoothing filter and the second PID controller. Wherein:
and the second I-V amplifying circuit is used for detecting the first current signal output by the laser optical path system, amplifying the first current signal and converting the amplified first current signal into a voltage signal.
And the second ADC acquisition circuit is used for periodically sampling the voltage signal output by the second I-V amplification circuit to obtain a digital signal.
And the second smoothing filter is used for carrying out low-pass filtering processing on the digital signal output by the second ADC acquisition circuit to obtain a second filtered signal.
The second PID controller is used for obtaining the laser power deviation direction according to the second filtering signal; and reversely adjusting the temperature of the semiconductor laser device according to the deviation direction of the laser power, and further reversely adjusting the driving current generated by the constant current source to realize the power stabilization of the laser.
In this embodiment, after receiving the laser, the backlight diode generates a tiny current signal according to the intensity of the laser, the laser power stabilizing system amplifies the current signal and converts the amplified current signal into a voltage signal, and the voltage signal is subjected to periodic sampling and smooth filtering at 100kHz to obtain a relatively accurate power signal.
Because the laser current needs to be adjusted continuously to realize laser frequency stabilization, the power of the laser deviates. The second PID controller processes the power signal passing through the second smoothing filter to generate a temperature control current, fine-tunes the temperature of the laser, and then reversely adjusts the current generated by the constant current source to realize the power stabilization of the laser.
In a preferred embodiment of the present invention, the I-V amplifier circuit, the ADC acquisition circuit, the smoothing filter, and the PID controller may be multiplexed. The conversion precision of the ADC acquisition circuit can be 16 bits, and the sampling frequency can be 100 kHz. The length of the smoothing filter may be 256, that is, the smoothing filter may perform smoothing filtering of 256 length on the sampled data:n is 0,1,2 …, N is 256; the smoothing filter has two roles: firstly, the filter is a low-pass filter used for filtering high-frequency noise interference, and secondly, the quantization error brought by A/D conversion is reduced. The PID controller may perform digital PID processing of 10kHz on the data passed through the smoothing filter; wherein, the digital PID algorithm can dynamically adjust the heating signal according to the difference value between the set temperature and the actual temperature. Laser deviceThe DBR semiconductor laser may be selected, and the specific parameters of the laser may be as follows: the laser modulation frequency is 10-20 kHz, and the current regulation range of the laser is 50-100 mA. The adjusting frequency of the TEC temperature controller can be 100 Hz.
Based on the above embodiment, the present invention also discloses a laser frequency power bistable method for a nuclear magnetic resonance gyroscope, which includes: outputting the transmitted light and a first current signal based on the semiconductor laser device; detecting transmitted light, and converting the transmitted light into a first filtering signal; obtaining a laser frequency deviation direction according to the phase difference between the sine wave reference signal and the first filtering signal; reversely adjusting the driving current generated by the constant current source according to the deviation direction of the laser frequency, and stabilizing the frequency of the semiconductor laser device at the central frequency of an absorption peak; detecting a first current signal, and converting the first current signal into a second filtered signal; obtaining a laser power deviation direction according to the second filtering signal; and reversely adjusting the temperature of the semiconductor laser device according to the deviation direction of the laser power, and further reversely adjusting the driving current generated by the constant current source to realize the power stabilization of the laser.
In this embodiment, the specific implementation flow of laser frequency and power bistable state may be as follows:
and step S11, heating the atomic gas chamber to 100 ℃, and starting the laser.
Step S12, setting the initial temperature of the laser, generating temperature control current through the TEC temperature controller, driving the TEC semiconductor refrigerator in the laser, controlling the temperature of the laser, and making the frequency of the laser generated by the laser at the frequency87Near the first line of Rb, i.e. near 795 nm.
And step S13, after the temperature of the laser is stabilized, the signal generator is used for carrying out sine wave modulation with the frequency of 10kHz and the amplitude of 5mA on the driving current generated by the constant current source to obtain a sine wave reference signal.
And step S14, the laser frequency stabilizing system generates a tiny current signal according to the intensity of the laser passing through the atomic gas chamber, amplifies the current signal and converts the amplified current signal into a voltage signal, and periodically samples and smoothly filters the voltage signal to obtain a relatively accurate light intensity signal.
Step S15, the first PID controller detects the phase difference between the sine wave reference signal and the light intensity signal (the first filtering signal) output by the laser frequency stabilization system by adopting a phase sensitive detection algorithm to obtain the laser frequency deviation direction; and reversely adjusting the driving current generated by the constant current source according to the deviation direction of the laser frequency, and stabilizing the frequency of the semiconductor laser device at the central frequency of the absorption peak.
Step S16, after receiving the laser, the backlight diode generates a tiny current signal according to the intensity of the laser, the laser power stabilizing system amplifies the current signal and converts the amplified current signal into a voltage signal, and the voltage signal is subjected to periodic sampling and smooth filtering of 100kHz to obtain a more accurate power signal.
Step S17, the second PID controller obtains the laser power deviation direction according to the power signal (second filtering signal); and reversely adjusting the temperature of the semiconductor laser device according to the deviation direction of the laser power, and further reversely adjusting the driving current generated by the constant current source to realize the power stabilization of the laser.
And step S18, repeating the steps S11-S17, and dynamically adjusting the temperature and the current of the laser to realize frequency power bistable of the laser.
In summary, on the basis of laser linear absorption frequency stabilization, the invention acquires the change of laser power by collecting the output signal of the photoelectric detector in the laser, and adjusts the temperature of the laser to realize the stabilization of the laser output power, and finally realizes the dual stabilization of the laser power and the frequency.
Secondly, in the invention, the temperature sampling frequency of the TEC temperature controller and various parameters of the PID controller are adjustable, the realization is simple, and the precision is higher.
In addition, in the invention, the modules such as the I-V amplifying circuit, the ADC acquisition circuit, the smoothing filter, the PID controller and the like can be multiplexed, thereby reducing the complexity of the system.
For the method embodiment, since it corresponds to the system embodiment, the description is relatively simple, and for the relevant points, reference may be made to the description of the system embodiment section.
The embodiments in the present description are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (7)
1. A laser frequency power bi-stable system for a nuclear magnetic resonance gyroscope, comprising: the system comprises a laser optical path system, a laser frequency stabilizing system and a laser power stabilizing system; wherein, the laser optical path system includes: a semiconductor laser device; the laser frequency stabilization system comprises: a constant current source;
a laser optical path system for outputting a transmission light and a first current signal based on the semiconductor laser device;
the laser frequency stabilization system is used for detecting the transmitted light and converting the transmitted light into a first filtering signal; obtaining a laser frequency deviation direction according to the phase difference between the sine wave reference signal and the first filtering signal; reversely adjusting the driving current generated by the constant current source according to the deviation direction of the laser frequency, and stabilizing the frequency of the semiconductor laser device at the central frequency of an absorption peak;
the laser power stabilizing system is used for detecting a first current signal and converting the first current signal into a second filtering signal; obtaining a laser power deviation direction according to the second filtering signal; reversely adjusting the temperature of the semiconductor laser device according to the deviation direction of the laser power, and further reversely adjusting the driving current generated by the constant current source to realize the power stabilization of the laser;
and the constant current source is used for generating driving current and adjusting the light-emitting intensity of the semiconductor laser device.
2. The laser frequency power bi-stable system for a nuclear magnetic resonance gyroscope of claim 1, wherein the laser optical path system further comprises: the device comprises a TEC temperature controller, a lens, a 1/4 glass slide and an atom gas chamber; wherein,
the TEC temperature controller is used for controlling the temperature of the semiconductor laser device;
the semiconductor laser device is used for outputting linearly polarized laser meeting set power and set frequency under the temperature control of the TEC temperature controller; converting the linear polarization laser into a first current signal and outputting the first current signal;
the lens is used for collimating the linearly polarized laser output by the semiconductor laser device;
1/4 glass slide for converting the collimated linear polarization laser into circular polarization light;
an atomic gas chamber for reacting the alkali metal in the atomic gas chamber under the action of the circularly polarized light87Rb is polarized to output polarized transmitted light.
3. The laser frequency power bistable system for a nuclear magnetic resonance gyroscope of claim 2, wherein said semiconductor laser device comprises: the TEC semiconductor refrigerator, the laser, the NTC thermistor and the backlight diode;
the TEC semiconductor refrigerator is used for heating or refrigerating the laser under the temperature control of the TEC temperature controller;
the laser is used for outputting linearly polarized laser meeting set power and set frequency under the heating or refrigeration of the TEC semiconductor refrigerator;
the NTC thermistor is used for detecting and feeding back the temperature of the laser;
and the backlight diode is used for converting the linearly polarized laser output by the laser into a first current signal.
4. Laser frequency power bistable system for nuclear magnetic resonance gyroscopes according to claim 3,
setting power, comprising: 10 mW;
setting a frequency, comprising: at a frequency of87Rb first line within allowable error; wherein the allowable error is: 0.5 nm;
the resistance of the NTC thermistor comprises: 10k omega.
5. The laser frequency power bi-stable system for a nuclear magnetic resonance gyroscope of claim 1, further comprising: the device comprises a photoelectric detector, a first I-V amplifying circuit, a first ADC (analog to digital converter) acquisition circuit, a first smoothing filter, a first PID (proportion integration differentiation) controller and a signal generator;
the photoelectric detector is used for detecting the transmitted light output by the laser optical path system and converting the transmitted light into a second current signal;
the first I-V amplifying circuit is used for amplifying the second current signal and converting the amplified second current signal into a voltage signal;
the first ADC acquisition circuit is used for periodically sampling the voltage signal output by the first I-V amplification circuit to obtain a digital signal;
the first smoothing filter is used for carrying out low-pass filtering processing on the digital signal output by the first ADC acquisition circuit to obtain a first filtered signal;
a signal generator for generating and outputting a sine wave reference signal;
the first PID controller is used for detecting the phase difference between the sine wave reference signal and the first filtering signal by adopting a phase-sensitive detection algorithm to obtain the laser frequency deviation direction; and reversely adjusting the driving current generated by the constant current source according to the deviation direction of the laser frequency, and stabilizing the frequency of the semiconductor laser device at the central frequency of the absorption peak.
6. The laser frequency power bi-stable system for a nuclear magnetic resonance gyroscope of claim 1, wherein the laser power bi-stable system comprises: the second I-V amplifying circuit, the second ADC acquisition circuit, the second smoothing filter and the second PID controller;
the second I-V amplifying circuit is used for detecting the first current signal output by the laser optical path system, amplifying the first current signal and converting the amplified first current signal into a voltage signal;
the second ADC acquisition circuit is used for periodically sampling the voltage signal output by the second I-V amplification circuit to obtain a digital signal;
the second smoothing filter is used for carrying out low-pass filtering processing on the digital signal output by the second ADC acquisition circuit to obtain a second filtered signal;
the second PID controller is used for obtaining the laser power deviation direction according to the second filtering signal; and reversely adjusting the temperature of the semiconductor laser device according to the deviation direction of the laser power, and further reversely adjusting the driving current generated by the constant current source to realize the power stabilization of the laser.
7. A method of laser frequency power bistability for a nuclear magnetic resonance gyroscope, comprising:
outputting the transmitted light and a first current signal based on the semiconductor laser device;
detecting transmitted light, and converting the transmitted light into a first filtering signal; obtaining a laser frequency deviation direction according to the phase difference between the sine wave reference signal and the first filtering signal; reversely adjusting the driving current generated by the constant current source according to the deviation direction of the laser frequency, and stabilizing the frequency of the semiconductor laser device at the central frequency of an absorption peak;
detecting a first current signal, and converting the first current signal into a second filtered signal; obtaining a laser power deviation direction according to the second filtering signal; and reversely adjusting the temperature of the semiconductor laser device according to the deviation direction of the laser power, and further reversely adjusting the driving current generated by the constant current source to realize the power stabilization of the laser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711158150.5A CN107845951A (en) | 2017-11-20 | 2017-11-20 | Laser frequency power bistable system and method for magnetic resonance gyroscope instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711158150.5A CN107845951A (en) | 2017-11-20 | 2017-11-20 | Laser frequency power bistable system and method for magnetic resonance gyroscope instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107845951A true CN107845951A (en) | 2018-03-27 |
Family
ID=61679737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711158150.5A Pending CN107845951A (en) | 2017-11-20 | 2017-11-20 | Laser frequency power bistable system and method for magnetic resonance gyroscope instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107845951A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767652A (en) * | 2018-05-31 | 2018-11-06 | 北京航空航天大学 | A kind of semiconductor laser integral structure |
| CN111256675A (en) * | 2020-01-19 | 2020-06-09 | 中国人民解放军国防科技大学 | Laser frequency stabilization system for nuclear magnetic resonance gyroscope |
| CN112615251A (en) * | 2020-12-15 | 2021-04-06 | 北京航天控制仪器研究所 | Laser frequency and power dual-stabilization method and device for atomic gyroscope |
| CN114487478A (en) * | 2022-01-26 | 2022-05-13 | 西安交通大学 | MOEMS acceleration sensor system based on quadrature carrier modulation |
| CN115097711A (en) * | 2022-05-24 | 2022-09-23 | 电子科技大学 | Cesium atomic clock microwave signal power stabilizing system based on cesium atomic ratiometric resonance |
| CN115639408A (en) * | 2022-12-23 | 2023-01-24 | 中大智能科技股份有限公司 | High-precision soil conductivity self-adaptive monitoring system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160202062A1 (en) * | 2015-01-09 | 2016-07-14 | Northrop Grumman Systems Corporation | Ratiometric nuclear magnetic resonance (nmr) gyroscope system |
| CN107086433A (en) * | 2017-06-15 | 2017-08-22 | 北京航空航天大学 | A kind of integrated magnetic resonance gyroscope laser power and frequency stabilization system |
-
2017
- 2017-11-20 CN CN201711158150.5A patent/CN107845951A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160202062A1 (en) * | 2015-01-09 | 2016-07-14 | Northrop Grumman Systems Corporation | Ratiometric nuclear magnetic resonance (nmr) gyroscope system |
| CN107086433A (en) * | 2017-06-15 | 2017-08-22 | 北京航空航天大学 | A kind of integrated magnetic resonance gyroscope laser power and frequency stabilization system |
Non-Patent Citations (1)
| Title |
|---|
| 王学峰 等: "核磁共振陀螺仪泵浦光频率波动抑", 《中国惯性技术学报》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767652A (en) * | 2018-05-31 | 2018-11-06 | 北京航空航天大学 | A kind of semiconductor laser integral structure |
| CN111256675A (en) * | 2020-01-19 | 2020-06-09 | 中国人民解放军国防科技大学 | Laser frequency stabilization system for nuclear magnetic resonance gyroscope |
| CN111256675B (en) * | 2020-01-19 | 2021-02-09 | 中国人民解放军国防科技大学 | Laser frequency stabilization system for nuclear magnetic resonance gyroscope |
| CN112615251A (en) * | 2020-12-15 | 2021-04-06 | 北京航天控制仪器研究所 | Laser frequency and power dual-stabilization method and device for atomic gyroscope |
| CN114487478A (en) * | 2022-01-26 | 2022-05-13 | 西安交通大学 | MOEMS acceleration sensor system based on quadrature carrier modulation |
| CN115097711A (en) * | 2022-05-24 | 2022-09-23 | 电子科技大学 | Cesium atomic clock microwave signal power stabilizing system based on cesium atomic ratiometric resonance |
| CN115097711B (en) * | 2022-05-24 | 2023-03-07 | 电子科技大学 | Cesium atomic clock microwave signal power stabilizing system based on cesium atomic ratiometric resonance |
| CN115639408A (en) * | 2022-12-23 | 2023-01-24 | 中大智能科技股份有限公司 | High-precision soil conductivity self-adaptive monitoring system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107845951A (en) | Laser frequency power bistable system and method for magnetic resonance gyroscope instrument | |
| US10243325B2 (en) | Method for stabilizing atomic devices | |
| US10215816B2 (en) | Magnetic field measuring apparatus | |
| US7652473B2 (en) | Magnetic field measuring optically pumped magnetometer apparatus | |
| US7613216B2 (en) | Laser frequency stabilizing apparatus, method and computer program product for stabilizing laser frequency | |
| JPS62244184A (en) | Oscillating frequency and output stabilizer for semiconductor laser | |
| CN103605086B (en) | A kind of based on fiber electro-optic modulator can spread magnetic measurement system | |
| CN105762635A (en) | Wavelength control device for adjustable optical module, and method thereof | |
| CN110530355B (en) | High-bandwidth signal detection method for integrated optical waveguide gyroscope resonant frequency tracking | |
| CN102801100B (en) | Device for improving output frequency stability of laser and laser with device | |
| CN108613670B (en) | Detection laser frequency stabilization device and method for atomic spin gyro | |
| US20110075692A1 (en) | Atomic frequency acquisition device based on self-mixing interference | |
| JP2018101886A (en) | Quantum interference device, atomic oscillator, electronic equipment and mobile object | |
| CN109066283A (en) | A kind of method, apparatus and system of laser frequency locking | |
| JP2013153111A (en) | Saturated absorption line determination method, and laser frequency stabilization device | |
| CN103545709A (en) | Laser light source device used for gas concentration detection | |
| Gong et al. | A QEPAS-based central wavelength stabilized diode laser for gas sensing | |
| CN112013828A (en) | Nuclear magnetic resonance gyroscope with integrated pumping laser and atomic gas chamber | |
| CN202840235U (en) | Frequency regulator of laser and laser having the same | |
| JP3783822B2 (en) | Frequency stabilized light source | |
| RU95907U1 (en) | QUANTUM FREQUENCY STANDARD | |
| CN111628408A (en) | Frequency stabilization system of semiconductor laser | |
| CN102769250B (en) | Atom cooling and trapping light source device | |
| JPS63260225A (en) | Frequency control system for cavity resonator | |
| JPS59140B2 (en) | semiconductor laser equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180327 |
|
| RJ01 | Rejection of invention patent application after publication |