CN115900772A - Method and system for improving random walk coefficient of integrated optical gyroscope - Google Patents
Method and system for improving random walk coefficient of integrated optical gyroscope Download PDFInfo
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Abstract
The invention relates to the technical field of optical gyroscopes, in particular to a method and a system for improving the random walk coefficient of an integrated optical gyroscope, which comprises the following steps: the light wave emitted by the broadband light source is divided into two light waves by the coupler, one light wave is transmitted to the modulator for phase modulation, and the other light wave is transmitted to the second detector to obtain the output power of the broadband light source or the wavelength of the broadband light source; after the interference light passes through the first detector, the interference light is transmitted to the digital processing module, and the digital processing module calculates Sagnac phase shift in the test time period
Noise value of
By changing the output power or wavelength of the broadband light source, the total random walk coefficient of the optical gyroscope is kept at a minimum value. The method provided by the invention andthe system solves the problem that the random walk performance of the integrated optical gyroscope is deteriorated due to different noise influences, and improves the random walk coefficient of the integrated optical gyroscope.
Description
Technical Field
The invention relates to the technical field of optical gyroscopes, in particular to a method and a system for improving random walk coefficients of an integrated optical gyroscope.
Background
Inertial navigation is an autonomous navigation technology based on an inertial sensitive device, and is widely applied to the fields of aerospace, ship navigation, unmanned driving and the like. The gyroscope is an inertia sensitive device for detecting the rotation angular velocity of an object relative to an inertia reference system, is a core component in an inertial navigation system, and the performance of the gyroscope determines the positioning capability of the inertial navigation system to a great extent. The current microminiaturized gyroscope comprises two important directions: the Micro-Electro-mechanical System (MEMS) gyroscope is based on the classical mechanics, and the Micro-optical gyroscope is based on the optical Sagnac effect. According to the prediction of the development trend of the US DARPA to the long-term inertial devices in 2008, the market of the medium-low precision gyroscope 20 years later is mainly occupied by the MEMS gyroscope and the micro-optical gyroscope. However, the MEMS gyroscope has a short lifetime and weak vibration resistance due to the existence of the vibrating component, which limits its application in some fields. The micro-optical gyroscope has the advantages of taking account of the all-solid-state structure of the optical gyroscope and the micro-nano light structure of the MEMS gyroscope, and can be applied to the fields of strong vibration and strong impact.
The random walk coefficient is an important parameter for measuring the static index of the optical gyroscope, and the white noise level of the optical gyroscope is evaluated to determine the minimum detectable measurement of the optical gyroscope.
For an interferometric integrated optical gyroscope, the random walk coefficient refers to a gyroscope output error generated by white noise and accumulated over time, which is mainly affected by detector thermal noise, shot noise, and relative intensity noise of the light source, and can be expressed as formula (1):
in the formula:
for a total random walk coefficient, is selected>
For photoelectric detectionA random walk coefficient based on thermal noise detected>
For random walk coefficients caused by shot noise>
Random walk coefficients caused by light source intensity noise; />
Is the boltzmann constant, and is, device for selecting or keeping>
Is a thermodynamic temperature, <' > is>
For switching off the resistance of the detector>
For the intensity of the photocurrent noise output on the photodetector, <' >>
Is light source spectrum width>
Is the bandwidth of the photodetector>
Is the electronic charge.
According to the optical Sagnac (Sagnac) effect, the loop length and the diameter of a sensitive loop directly influence the precision of a gyroscope, and the Sagnac phase shift detected by the optical gyroscope
And a sensitive speed>
Can be expressed by the following formula (2):
wherein, the first and the second end of the pipe are connected with each other,
the wavelength of a broadband light source, c the speed of light in vacuum, L the length of a sensitive ring and D the diameter of the sensitive ring.
From the foregoing equation (1), it can be seen that the total random walk coefficient of the interferometric integrated optical gyroscope includes three different sources, each of which contributes differently to the random walk coefficient of the gyroscope. At present, the improvement of random walk performance of an interference type integrated optical gyroscope faces three difficulties:
1. the effective area of the sensitive ring is limited due to integration, so that the precision of the gyroscope is limited in terms of the Sangnac principle, and the random walk performance of the gyroscope is limited;
2. the optical gyroscope optical system scheme cannot effectively inhibit three different noise sources in the formula (1) due to integration;
3. influence brought by a noise source cannot be effectively filtered in the digital resolving process of the optical gyroscope.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a system for improving the random walk coefficient of an integrated optical gyroscope.
The invention is realized by the following technical scheme:
a method for improving the random walk coefficient of an integrated optical gyroscope comprises the following steps:
s1: the light wave emitted by the broadband light source is divided into two light waves by the coupler, one modulated light wave is transmitted to the modulator and is transmitted in two opposite directions in the sensitive ring after being phase modulated by the modulator, then the two modulated light waves reach the modulator and are modulated by the phase to form interference light and then return to the coupler, the other detected light wave is transmitted to the second detector, the output current is amplified by the second operational amplifier, the signal is transmitted to the digital processing module after being subjected to mode conversion by the second AD converter, and the digital processing module acquires, resolves and doubles the signal to obtain the output power of the broadband light source or the wavelength of the broadband light source;
s2: interference light returning to the coupler is subjected to photoelectric conversion through the first detector to output current, the output current is amplified through the first operational amplifier, mode conversion is carried out through the first AD converter to transmit signals to the digital processing module, and the digital processing module acquires and resolves the signals to obtain Sagnac phase shift
On the other hand, the digital output is directly carried out by the serial port sending module, meanwhile, the digital-to-analog conversion is carried out by the DA module, the digital-to-analog conversion enters the post-stage operational amplifier and then is input into the modulator, and the modulator generates a feedback phase shift on/in the light path system>
Counteracting Sagnac phase shift caused by external input angular velocity sensitive by the sensing ring>
Enabling the gyroscope to work in a zero phase in a closed loop mode;
s3: step S2, the digital processing module calculates Sagnac phase shift in a test time period
Is greater than or equal to>
And will >>
And optical gyro base precision value>
Comparing if->
The broadband light source maintains the original state and if->
Then the process jumps to step S4, if->
Skipping to step S5;
s4: the digital processing module controls the light source driving current control module to increase the output light power of the broadband light source or controls the light source temperature current control module to increase the internal temperature of the broadband light source, and then the Sagnac phase shift in the next testing period is recalculated
Is greater than or equal to>
Will>
And &>
Making a comparison if->
The digital processing module controls the light source driving current control module to continuously increase the output light power of the broadband light source or controls the light source temperature current control module to continuously increase the internal temperature of the broadband light source until the internal temperature is greater or less than the preset temperature>
Setting the output light power of the broadband light source as a noise value after the adjustment process is finished>
The optical power or the output wavelength of the broadband light source is a noise value->
Wavelength of when, if>
The digital processing module controls the light source driving current control module to reduce the output light power of the broadband light source or controls the light source temperature current control module to reduce the internal temperature of the broadband light source, and the internal temperature is calculated againNoise value &>
And will->
And &>
Comparing, if +>
If so, the adjustment process is ended, and the output light power of the broadband light source is set to be the noise value->
The optical power or the output wavelength of the broadband light source is a noise value->
If in conjunction with a wavelength of>
The control module for repeatedly controlling the light source driving current increases the output light power of the broadband light source or controls the light source temperature and current to continuously increase the internal temperature of the broadband light source and calculates the noise value->
Compare when->
And &>
If->
If so, the adjustment process is ended, and the output light power of the broadband light source is set to be the noise value->
The optical power or the output wavelength of the broadband light source is the noise value->
In a wavelength of, in which->
Representing the number of test periods;
s5: the digital processing module controls the light source driving current control module to reduce the output light power of the broadband light source or controls the light source temperature current control module to reduce the internal temperature of the broadband light source, and then the Sagnac phase shift in the next time period is recalculated
Is greater than or equal to>
Will >>
And &>
Making a comparison if >>
The digital processing module controls the light source driving current control module to reduce the output light power of the broadband light source or controls the light source temperature current control module to continuously reduce the internal temperature of the broadband light source until the internal temperature is greater or less than the preset temperature>
Setting the output light power of the broadband light source as the noise value->
The optical power or the output wavelength of the broadband light source is a noise value->
Wavelength of when, if>
The digital processing module controls the light source driving current control module to increase the output light power of the broadband light source or controls the light source temperature current control module to improve the interior of the broadband light sourceTemperature, recalculated noise value->
And will->
And/or>
Comparing if->
If so, the adjustment process is ended, and the output light power of the broadband light source is set to be the noise value->
The optical power or the output wavelength of the broadband light source is the noise value->
If in conjunction with a wavelength of>
Repeatedly increasing the optical power of the broadband light source or increasing the internal temperature of the broadband light source, and calculating the noise value->
And compare it at this time>
And/or>
If +>
If so, the adjustment process is ended, and the output light power of the broadband light source is set to be the noise value->
The optical power or the output wavelength of the broadband light source is a noise value->
The wavelength of light.
Optimally, one test period in step S3 is 100 seconds.
Further, in the process of increasing the output light power of the broadband light source or increasing the internal temperature of the light source in the steps S4 and S5, if the output light power of the broadband light source or the internal temperature of the light source reaches a preset maximum value, the adjustment process is ended, and the maximum light power is used as the output light power of the gyroscope broadband light source or the wavelength at the highest internal temperature of the light source is used as the wavelength of the gyroscope broadband light source; in the process of reducing the output light power of the broadband light source or reducing the internal temperature of the light source in the steps S4 and S5, if the output light power of the broadband light source or the internal temperature of the light source reaches a preset minimum value, the adjustment process is ended, and the minimum light power is used as the output light power of the broadband light source or the wavelength at the lowest internal temperature of the light source is used as the wavelength of the gyroscope broadband light source.
Further, the first detector is a photoelectric detector, the second detector adopts a power detector when the output power of the broadband light source needs to be detected, and the second detector adopts a wavelength detector when the wavelength of the broadband light source needs to be detected.
A system for improving the random walk coefficient of an integrated optical gyroscope is used for executing the method for improving the random walk coefficient of the integrated optical gyroscope and comprises a broadband light source, a coupler, a modulator, a sensitive ring, a digital processing module, a first detector, a second detector, a light source driving current control module and a light source temperature current control module, wherein the output end of the broadband light source is coupled with the input end of the coupler, the first output end of the coupler is coupled with the input end of the modulator, the second output end of the coupler is coupled with the input end of the second detector, the two tail fibers of the modulator are respectively coupled with the two tail fibers of the sensitive ring, the input end of the first detector is coupled with the detection end of the coupler, the output end of the second detector is coupled with the input end of the digital processing module sequentially through a second operational amplifier and a second AD converter, the output end of the first detector is coupled with the input end of the digital processing module sequentially through the first operational amplifier and the first AD converter, the feedback end of the digital processing module is coupled with the input end of the DA converter, the output end of the post operational amplifier is coupled with the input end of the digital processing module, the output end of the post operational amplifier is coupled with the light source driving current control module, the output end of the light source driving current control module is connected with the input end of the broadband light source, and the temperature control module, and the broadband light source driving current control module are connected with the input end of the broadband light source.
Further, the broadband light source is provided with a thermistor, a light emitting diode and a peltier which are sequentially pasted, the light emitting diode is connected with the light source driving current control module, and the peltier and the thermistor are respectively connected with the light source temperature current control module.
The invention has the beneficial effects that:
the method and the system for improving the random walk coefficient of the integrated optical gyroscope provided by the invention adopt two-path detector detection technology to adjust the output power of a broadband light source or the wavelength of the broadband light source, so that the total random walk coefficient of the optical gyroscope is kept at the minimum value, the problem of the degradation of the random walk performance of the gyroscope caused by the influence of different noises of the interference type integrated optical gyroscope is solved, and the random walk coefficient of the integrated optical gyroscope is improved.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Figure 2 is a schematic diagram of a broadband light source configuration of the present invention.
In the figure: 1. the LED light source comprises a broadband light source, 2 a coupler, 3 a second detector, 4 a modulator, 5 a sensitive ring, 6 a rear-stage operational amplifier, 7 a DA converter, 8 a serial port sending module, 9 a digital processing module, 10 a second AD converter, 11 a second operational amplifier, 12 a first AD converter, 13 a first operational amplifier, 14 a light source temperature current control module, 15 a light source driving current control module, 16 a first detector, 17 a light emitting diode, 18 Peltier and 19 a thermistor.
Detailed Description
A method for improving the random walk coefficient of an integrated optical gyroscope comprises the following steps:
s1: the light wave emitted by the broadband light source is divided into two light waves by the coupler, one modulated light wave is transmitted to the modulator and is transmitted in two opposite directions in the sensitive ring after being phase modulated by the modulator, then the two modulated light waves reach the modulator and are modulated by the phase to form interference light and then return to the coupler, the other detected light wave is transmitted to the second detector, the output current is amplified by the second operational amplifier, the signal is transmitted to the digital processing module after being subjected to mode conversion by the second AD converter, and the digital processing module acquires, resolves and doubles the signal to obtain the output power of the broadband light source or the wavelength of the broadband light source;
s2: interference light returning to the coupler carries out photoelectric conversion through the first detector to output current, the output current is amplified through the first operational amplifier, mode conversion is carried out through the first AD converter to transmit signals to the digital processing module, and the digital processing module acquires and calculates the signals to obtain Sagnac phase shift
On the other hand, the digital output is directly carried out by the serial port sending module, meanwhile, the digital-to-analog conversion is carried out by the DA module, the digital-to-analog conversion enters the post-stage operational amplifier and then is input into the modulator, and the modulator generates a feedback phase shift on/in the light path system>
Counteracting the Sagnac phase shift caused by the external input angular velocity to which the sense loop is sensitive>
Enabling the gyroscope to work in a zero phase in a closed loop mode; />
S3: step S2, the digital processing module calculates Sagnac phase shift in a test time period
Is greater than or equal to>
And will->
And optical gyro base accuracyValue->
Comparing if->
The broadband light source maintains the original state and if->
Then the process jumps to step S4, if->
Skipping to step S5;
the digital processing module calculates the Sagnac phase shift within a test period
Is greater than or equal to>
Then, the calculation is performed according to equation (3):
in the formula: i Sagnac phase shift obtained for a test period
Number of value(s) in combination>
Phase shifting Sagnac>
Is based on the mean value of (4)>
The number of test periods is indicated.
S4: the digital processing module controls the light source driving current control module to increase the output light power of the broadband light source or controls the light source temperature current control module to increase the internal temperature of the broadband light source, and then the Sagnac phase shift in the next test period is recalculated
Is greater than or equal to>
Will >>
And/or>
Making a comparison if >>
The digital processing module controls the light source driving current control module to continuously increase the output light power of the broadband light source or controls the light source temperature current control module to continuously increase the internal temperature of the broadband light source until the internal temperature is greater or less than the preset temperature>
Setting the output light power of the broadband light source as a noise value after the adjustment process is finished>
The optical power or the output wavelength of the broadband light source is a noise value->
Wavelength of time, if>
The digital processing module controls the light source driving current control module to reduce the output light power of the broadband light source or controls the light source temperature current control module to reduce the internal temperature of the broadband light source, and calculates the noise value->
And will->
And/or>
In comparison, if
If so, the adjustment process is ended, and the output light power of the broadband light source is set to be the noise value->
The optical power or the output wavelength of the broadband light source is the noise value->
If is greater than or equal to>
The current control module repeatedly controls the light source driving current to increase the output light power of the broadband light source or controls the light source temperature to continuously increase the internal temperature of the broadband light source, and calculates the noise value ≥>
And compare it at this time>
And/or>
If->
If so, the adjustment process is ended, and the output light power of the broadband light source is set to be the noise value->
The optical power or the output wavelength of the broadband light source is the noise value->
A wavelength of time, wherein->
Representing the number of test periods;
s5: the digital processing module controls the light source driving current control module to reduce the output light power of the broadband light source or controls the light source temperature current control module to reduce the internal temperature of the broadband light source, and then the Sagnac phase shift in the next time period is recalculated
Is greater than or equal to>
Will >>
And/or>
Making a comparison if->
The digital processing module controls the light source driving current control module to reduce the output light power of the broadband light source or controls the light source temperature current control module to continuously reduce the internal temperature of the broadband light source until the internal temperature is greater or less than the preset temperature>
Setting the output light power of the broadband light source as the noise value->
The optical power or the output wavelength of the broadband light source is a noise value->
Wavelength of time, if>
The digital processing module controls the light source driving current control module to increase the output light power of the broadband light source or controls the light source temperature current control module to increase the internal temperature of the broadband light source, and calculates the noise value->
And will->
And/or>
Comparing if->
If so, the adjustment process is ended, and the output light power of the broadband light source is set to be the noise value->
The optical power or the output wavelength of the broadband light source is a noise value->
If is greater than or equal to>
Repeatedly increasing the optical power of the broadband light source or increasing the internal temperature of the broadband light source, and calculating the noise value->
Compare when->
And &>
If->
If so, the adjustment process is ended, and the output light power of the broadband light source is set to be the noise value->
The optical power or the output wavelength of the broadband light source is a noise value->
The wavelength of light. Noise value->
The optical power at the time, i.e. the second detector is at the fifth->
The output power, the noise value->
Wavelength of time i.e. the second detector is at the fourth->
The wavelength of the broadband light source detected during the test period.
The interferometric integrated optical gyroscope adopts a 'four-state' square wave for modulation and demodulation, the frequency of a modulation signal is the eigen frequency of the sensing ring, and an output signal on a first detector of the integrated optical gyroscope can be expressed as a formula (4):
in the formula:
is sensitive Sagnac phase, < >>
To bias the phase, is>
For the light intensity detected by the first detector>
Is the initial value of the light intensity emitted by the broadband light source.
When the integrated optical gyroscope is used for testing the random walk coefficient, the integrated optical gyroscope can be in a static state, and then the integrated optical gyroscope is in the static state
Thus, the output signal on the first detector can be expressed as equation (5):
substituting formula (5) into formula (1) yields formula (6):
order to
，/>
，/>
，/>
Then, formula (6) can be represented by formula (7):
in the formula:
is a set argument, has no actual physical meaning, is>
、/>
、/>
The coefficient is a set independent variable coefficient, and has no actual physical meaning; equation (7) shows that the random walk coefficient of the interferometric optical gyroscope can be regarded as being based on->
Is a univariate quadratic function of the argument, and can be known from the curve of the univariate quadratic function when->
Greater than 0, in the blood pressure or in the blood pressure vessel>
Has a minimum value>
I.e. formula (8):
it follows that by optimizing the bandwidth of the photodetector
Based on the light intensity>
The spectrum shape of the light source can improve the random walk performance of the integrated optical gyroscope so as to make the integrated optical gyroscope be on or off>
Reaches a minimum value>
。
Because the wavelength in the spectrum shape of the light source has a linear relation with the temperature of the light source, the spectrum shape of the light source can be optimized by adjusting the temperature of the broadband light source, and therefore the random walk performance of the integrated optical gyroscope is improved.
Therefore, the first detector is responsible for collecting the output current of the system, the light intensity state of the optical path of the gyro system is judged through the output current of the first detector, the digital processing module carries out calculation to obtain the Sagnac interference phase state caused by the external input angular velocity sensitive to the gyro optical path system, and the corresponding module is controlled to change the output power or the temperature of the broadband light source, namely, the output current of the system is controlled
The spectrum shape of the broadband light source can ensure that the total random walk coefficient of the optical gyroscope reaches the minimum value, the total random walk coefficient is detected by the second detector, the output power or the wavelength of the broadband light source at the moment is calculated by the digital processing module, and the output power or the wavelength of the broadband light source is stabilized at the value, so that the total random walk coefficient of the optical gyroscope is kept at the minimum value, and the problem of interference is solvedThe problem that the random walk performance of the gyro is deteriorated due to different noise influences of the interference-type integrated optical gyro is solved, and the random walk coefficient of the integrated optical gyro is improved.
Optimally, one test period in step S3 is 100 seconds.
Further, in the process of increasing the output light power of the broadband light source or increasing the internal temperature of the light source in the steps S4 and S5, if the output light power of the broadband light source or the internal temperature of the light source reaches a preset maximum value, the adjustment process is ended, and the maximum light power is used as the output light power of the gyroscope broadband light source or the wavelength at the highest internal temperature of the light source is used as the wavelength of the gyroscope broadband light source; in the process of reducing the output light power of the broadband light source or reducing the internal temperature of the light source in the steps S4 and S5, if the output light power of the broadband light source or the internal temperature of the light source reaches a preset minimum value, the adjustment process is ended, the minimum light power is used as the output light power of the broadband light source, or the wavelength at the lowest internal temperature of the light source is used as the wavelength of the gyro broadband light source, so that the broadband light source can be controlled to work in the optimal state within the allowable range all the time.
The specific structural schematic diagram of the system is shown in fig. 1, and the system comprises a broadband light source 1, a coupler 2, a modulator 4, a sensitive ring 5, a digital processing module 9, a first detector 16, a second detector 3, a light source driving current control module 15 and a light source temperature current control module 14, wherein an output end of the broadband light source is coupled with an input end of the coupler, a first output end of the coupler is coupled with an input end of the modulator, a second output end of the coupler is coupled with an input end of the second detector, two tail fibers of the modulator are respectively coupled with two tail fibers of the sensitive ring, an input end of the first detector is coupled with a detection end of the coupler, an output end of the second detector is coupled with an input end of the digital processing module sequentially through a second operational amplifier 11 and a second AD converter 10, an output end of the first detector is coupled with an input end of the digital processing module sequentially through a first operational amplifier 13, a first AD converter 12, a feedback end of the digital processing module is coupled with an input end of the DA converter 7, an input end of the digital processing module is coupled with an input end of the DA converter, an output end of the light source driving current control module is coupled with an input end of the broadband light source, and a temperature current control module, and a serial port of the broadband light source control module are coupled with an output end of the broadband light source control module.
Further, the first detector is a photoelectric detector, the second detector adopts a power detector when the output power of the broadband light source needs to be detected, and the second detector adopts a wavelength detector when the wavelength of the broadband light source needs to be detected. When the digital processing module controls the light source driving current control module to change the output power of the broadband light source, the light source temperature current control module keeps the original state, and when the digital processing module controls the light source temperature current control module to change the temperature of the broadband light source, the light source driving current control module keeps the original state.
Further, the specific structural schematic diagram of the broadband light source is shown in fig. 2, and the broadband light source comprises a thermistor 19, a light emitting diode 17 and a peltier 18 which are sequentially pasted, wherein the light emitting diode is connected with a light source driving current control module, and the peltier and the thermistor are respectively connected with a light source temperature current control module. When the digital processing module needs to adjust the output power of the broadband light source after resolving, the digital processing module controls the light source to drive the current control module to change the current passing through the light emitting diode so as to adjust the output power of the broadband light source, when the digital processing module needs to adjust the wavelength of the broadband light source after resolving, the digital processing module controls the light source temperature current control module to change the current flowing into or out of the Peltier so as to adjust the temperature of the broadband light source, and then the adjustment of the wavelength of the broadband light source is realized, and the thermistor is responsible for feeding back the temperature information of the broadband light source to the light source temperature current control module, so that the accurate control of the light source temperature current control module is realized.
In summary, the method and system for improving the random walk coefficient of the integrated optical gyroscope provided by the invention adopt two-path detector detection technology to adjust the output power of the broadband light source or the wavelength of the broadband light source, so that the total random walk coefficient of the optical gyroscope is kept at the minimum value, the problem that the random walk performance of the gyroscope is deteriorated due to different noise influences of the interference type integrated optical gyroscope is solved, and the random walk coefficient of the integrated optical gyroscope is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for improving the random walk coefficient of an integrated optical gyroscope is characterized by comprising the following steps: the method comprises the following steps:
s1: the light wave emitted by the broadband light source is divided into two light waves by the coupler, one modulated light wave is transmitted to the modulator and is transmitted in two opposite directions in the sensitive ring after being phase modulated by the modulator, then the two modulated light waves reach the modulator and are modulated by the phase to form interference light and then return to the coupler, the other detected light wave is transmitted to the second detector, the output current is amplified by the second operational amplifier, the signal is transmitted to the digital processing module after being subjected to mode conversion by the second AD converter, and the digital processing module acquires, resolves and doubles the signal to obtain the output power of the broadband light source or the wavelength of the broadband light source;
s2: interference light returning to the coupler carries out photoelectric conversion through the first detector to output current, the output current is amplified through the first operational amplifier, mode conversion is carried out through the first AD converter to transmit signals to the digital processing module, and the digital processing module acquires and calculates the signals to obtain Sagnac phase shift
Then, on one hand, the serial port sending module directly outputs the digital signals, and simultaneously, the digital signals are sent to the DA module for digital-to-analog conversionAfter entering the post-stage operational amplifier, the signal is input into a modulator which generates a feedback phase shift->
Counteracting the Sagnac phase shift caused by the external input angular velocity to which the sense loop is sensitive>
Enabling the gyroscope to work in a zero phase in a closed loop mode;
s3: step S2, the digital processing module calculates Sagnac phase shift in a test time period
In a noise value->
And will >>
And the optical gyro basis precision value->
Comparing if->
The broadband light source maintains the original state and if->
Then, the process jumps to step S4, if/or>
Skipping to step S5;
s4: the digital processing module controls the light source driving current control module to increase the output light power of the broadband light source or controls the light source temperature current control module to increase the internal temperature of the broadband light source, and then the Sagnac phase shift in the next test period is recalculated
Noise value of/>
Will >>
And/or>
Making a comparison if->
The digital processing module controls the light source driving current control module to continuously increase the output light power of the broadband light source or controls the light source temperature current control module to continuously increase the internal temperature of the broadband light source until the internal temperature is greater or less than the preset temperature>
Setting the output light power of the broadband light source to be a noise value after the adjustment process is finished>
The optical power or the output wavelength of the broadband light source is the noise value->
Wavelength of time, if>
The digital processing module controls the light source driving current control module to reduce the output light power of the broadband light source or controls the light source temperature current control module to reduce the internal temperature of the broadband light source, and calculates the noise value ≥ again>
And will >>
And/or>
In comparison, the comparison result is obtained,if/or>
If so, the adjustment process is ended, and the output light power of the broadband light source is set to be the noise value->
The optical power or the output wavelength of the broadband light source is the noise value->
If is greater than or equal to>
Repeatedly controlling the light source driving current control module to increase the output light power of the broadband light source or controlling the light source temperature current control module to continuously increase the internal temperature of the broadband light source, and calculating the noise value
And compare it at this time>
And/or>
If +>
If so, the adjustment process is ended, and the output light power of the broadband light source is set to be the noise value->
The optical power or the output wavelength of the broadband light source is a noise value->
A wavelength of time, wherein->
Representing the number of test periods;
s5: the digital processing module controls the light source driving current control module to reduce the output light power of the broadband light source or controls the light source temperature current control module to reduce the internal temperature of the broadband light source, and then the Sagnac phase shift in the next time period is recalculated
In a noise value->
Will >>
And/or>
Making a comparison if->
The digital processing module controls the light source driving current control module to reduce the output light power of the broadband light source or controls the light source temperature current control module to continuously reduce the internal temperature of the broadband light source until the internal temperature is greater or less than the preset temperature>
Setting the output light power of the broadband light source to be a noise value->
The optical power or the output wavelength of the broadband light source is a noise value->
Wavelength of time, if>
The digital processing module controls the light source driving current control module to increase the output light power of the broadband light source or controls the light source temperature current control module to increase the internal temperature of the broadband light source, and calculates the noise value ≥ again>
And will >>
And &>
Comparing, if +>
If so, the adjustment process is ended, and the output light power of the broadband light source is set to be the noise value->
The optical power or the output wavelength of the broadband light source is a noise value->
If in conjunction with a wavelength of>
Repeatedly increasing the optical power of the broadband light source or increasing the internal temperature of the broadband light source, and calculating the noise value->
And compare it at this time>
And/or>
If +>
If so, the adjustment process is ended, and the output light power of the broadband light source is set to be the noise value->
The optical power or output wavelength of the broadband light source is a noise value
The wavelength of time.
2. The method for improving the random walk coefficient of the integrated optical gyroscope according to claim 1, wherein the method comprises the following steps: in the process of increasing the output light power of the broadband light source or increasing the internal temperature of the light source in the steps S4 and S5, if the output light power of the broadband light source or the internal temperature of the light source reaches a preset maximum value, the adjustment process is finished, and the maximum light power is used as the output light power of the gyroscope broadband light source or the wavelength at the highest internal temperature of the light source is used as the wavelength of the gyroscope broadband light source; in the process of reducing the output light power of the broadband light source or reducing the internal temperature of the light source in the steps S4 and S5, if the output light power of the broadband light source or the internal temperature of the light source reaches a preset minimum value, the adjustment process is ended, and the minimum light power is used as the output light power of the broadband light source or the wavelength at the lowest internal temperature of the light source is used as the wavelength of the gyroscope broadband light source.
3. The method for improving the random walk coefficient of the integrated optical gyroscope according to claim 1, wherein: one test period in step S3 is 100 seconds.
4. The method for improving the random walk coefficient of the integrated optical gyroscope according to claim 1, wherein: the first detector is a photoelectric detector, the second detector adopts a power detector when the output power of the broadband light source needs to be detected, and the second detector adopts a wavelength detector when the wavelength of the broadband light source needs to be detected.
5. The method for improving the random walk coefficient of the integrated optical gyroscope according to claim 1, wherein the method comprises the following steps: the broadband light source is provided with a thermistor, a light emitting diode and a Peltier which are sequentially pasted, the light emitting diode is connected with the light source driving current control module, and the Peltier and the thermistor are respectively connected with the light source temperature current control module.
6. A system for improving the random walk coefficient of an integrated optical gyroscope, which is used for implementing the method for improving the random walk coefficient of an integrated optical gyroscope in any one of claims 1 to 5, and is characterized in that: the broadband light source temperature control device comprises a broadband light source, a coupler, a modulator, a sensitive ring, a digital processing module, a first detector, a second detector, a light source driving current control module and a light source temperature current control module, wherein the output end of the broadband light source is coupled with the input end of the coupler, the first output end of the coupler is coupled with the input end of the modulator, the second output end of the coupler is coupled with the input end of the second detector, two tail fibers of the modulator are coupled with two tail fibers of the sensitive ring respectively, the input end of the first detector is coupled with the detection end of the coupler, the output end of the second detector is coupled with the input end of the digital processing module through a second operational amplifier and a second AD converter, the output end of the first detector is coupled with the input end of the digital processing module through the first operational amplifier and the first AD converter, the feedback end of the digital processing module is coupled with the input end of the DA converter, the output end of the second AD converter is coupled with the input end of the rear operational amplifier, the output end of the rear operational amplifier is coupled with the feedback end of the modulator, the output end of the digital processing module is coupled with the input end of the serial port sending module, the digital processing module, the output end of the broadband light source driving module is coupled with the temperature control module or the broadband light source driving current control module.
7. The system for improving the random walk coefficient of the integrated optical gyroscope according to claim 6, wherein: the broadband light source comprises a thermistor, a light emitting diode and a Peltier which are sequentially pasted, the light emitting diode is connected with the light source driving current control module, and the Peltier and the thermistor are respectively connected with the light source temperature current control module.
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