A Laser Gyroscope State and Life Monitoring System and Method Based on Ferroelectric Memory

Abstract

The present invention discloses a system and method for monitoring the state and life of a laser gyroscope based on ferroelectric storage. The system includes: a laser gyroscope body and a laser gyroscope control system; the laser gyroscope body includes a laser resonator cavity, a cathode, two anodes, a dither wheel, and a beam combining prism, and the laser gyroscope control system includes a microcontroller and a laser gyroscope high-voltage circuit, a frequency stabilization circuit, a dither control circuit, an AC output small-signal processing circuit, a ferroelectric memory, a button battery, and a communication interface connected to the microcontroller. The ferroelectric memory is used to record the state data during the operation of the laser gyroscope, and monitor and estimate the life of the laser gyroscope based on the state data. The communication interface is used for data communication and interaction between the laser gyroscope control system and the upper computer during equipment inspection. The present invention can collect and record the on-site application data of the laser gyroscope, and monitor the state and life of the laser gyroscope based on the on-site application data, and has the advantages of simple system structure and easy operation, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of laser gyroscope control, and more specifically, to a laser gyroscope state and life monitoring system and method based on ferroelectric storage. Background Art

[0002] Laser gyroscopes have the advantages of small volume, high precision, good stability, etc., and are one of the most widely used inertial components at present. Before leaving the factory, laser gyroscopes need to undergo strict aging screening, multi-condition testing, and parameter adjustment and optimization based on these test data to ensure that each delivered laser gyroscope can be in the optimal performance and have high reliability. However, in the actual complex environment and application scenarios, the preset parameters of the laser gyroscope may not be optimal and the performance may not be the best; after the laser gyroscope body is inflated and encapsulated, although the light test is qualified, as time goes by after leaving the factory, there may be a slow air leakage phenomenon in the microcrystalline glass body and each encapsulation part, and the light intensity of the laser gyroscope may gradually decrease over time. If these actual application data can be obtained, recorded, stored, and read, it will be very beneficial for predicting the life of the laser gyroscope and mastering the change law of the performance of the laser gyroscope during the application process. For these reasons, it is necessary to collect and record the on-site application data of the laser gyroscope, analyze these data, and based on this, read, adjust, optimize, and update the parameters of the laser gyroscope during the regular maintenance and inspection process of the equipment object; according to the change of some performance data of the laser gyroscope, estimate the service life of the laser gyroscope in order to carry out scrapping or replacement.

[0003] In addition, it is also very necessary to record and store the operation data of the laser gyroscope for fault diagnosis and traceability. Therefore, it is necessary to design a laser gyroscope state and life monitoring system and method based on ferroelectric storage. Summary of the Invention

[0004] The purpose of the present invention is to provide a laser gyroscope state and life monitoring system and method based on ferroelectric storage to overcome the defects existing in the prior art.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A laser gyroscope state and life monitoring system based on ferroelectric storage includes a laser gyroscope body and a laser gyroscope control system;

[0007] The laser gyroscope body includes a laser resonator, a cathode, two anodes, a dither wheel, and a beam-combining prism. The laser resonator is composed of a microcrystalline glass cavity, two plane mirrors, and two spherical mirrors. Two counter-propagating lasers are generated in the laser resonator. Piezoelectric ceramics for stabilizing the cavity length of the laser resonator are installed on the two spherical mirrors. The laser resonator is also equipped with a cathode and two anodes. The microcrystalline glass cavity is supported on the dither wheel. Piezoelectric ceramics are mounted on the spokes of the dither wheel. The deformation of the piezoelectric ceramics drives the dither wheel to drive the cavity to vibrate back and forth to generate positive and negative alternating dither frequency offsets. The beam-combining prism is installed on one of the plane mirrors;

[0008] The laser gyroscope control system includes a microcontroller and a laser gyroscope high-voltage circuit, a frequency stabilization circuit, a dither control circuit, an AC output small-signal processing circuit, a ferroelectric memory, a button battery, and a communication interface connected to the microcontroller. The laser gyroscope high-voltage circuit is respectively connected to a cathode and two anodes. The frequency stabilization circuit is connected to a DC phototube on one plane mirror and the piezoelectric ceramics on the two spherical mirrors. The dither control circuit is connected to the dither wheel. The AC output small-signal processing circuit is connected to an AC phototube on the beam-combining prism. The ferroelectric memory is used to record the state data during the operation of the laser gyroscope, and monitor and estimate the life of the laser gyroscope according to the state data. The communication interface is used for data communication and interaction between the laser gyroscope control system and the upper computer during equipment inspection.

[0009] Further, the two plane mirrors and the two spherical mirrors are oppositely arranged at the four corners of the laser resonator.

[0010] Further, the two anodes are respectively arranged on the laser resonator between the two plane mirrors and the two spherical mirrors, and one cathode is installed on the laser resonator between the two spherical mirrors.

[0011] The present invention also provides a method for a laser gyroscope state and life monitoring system based on ferroelectric storage as described above, including the following steps:

[0012] S1. The laser gyroscope is powered on and turned on, and the laser gyroscope control system is started;

[0013] S2. Start the record subroutine of the laser gyroscope operating state. This subroutine reads the address of the current data recording area of the ferroelectric memory, adds the address offset, and assigns it to the address pointer. The record subroutine will jump to the new address to start the data recording operation;

[0014] S3. The recording subroutine records the power-on time, reads out the factory preset data in the ferroelectric memory, performs an error operation on the current operating state data of the laser gyroscope and the factory data. When the error is less than the set threshold, it indicates that the laser gyroscope starts to work normally. Record the time interval between this moment and the power-on moment as the startup time of this laser gyroscope operation, set the normal data recording parameter n = 1, the abnormal data recording parameter m = 1, and record the current data into the data recording area and the mean value recording area of the starting data group, and write their valid flag words respectively;

[0015] S4. When the next sampling time is reached, read the current data and compare it with the factory data. If the error is less than the set threshold, assign n = n + 1. When n is odd, i = 1, corresponding to the data recording area of the first data group; when n is even, i = 2, corresponding to the data recording area of the second data group. First, clear the valid flag words of the data recording area and the mean value recording area of the i-th data group, then write the current data to the data recording area of the i-th data group, and then write its data recording area valid flag word to indicate that the data in the data recording area of the i-th data group is valid. Subtract the mean value of the mean value recording area of the i-th data group from the current data, divide by n and then sum with this mean value to obtain the current mean value. Write the current mean value to the mean value recording area of the i-th data group, overwrite the original mean value record, and write its mean value recording area valid flag word to indicate that the data in this mean value recording area is valid;

[0016] S5. If the error between the read current data and the factory data is not less than the set threshold, assign m = m + 1. If m <= 3, record the abnormal data into the abnormal data recording area in sequence and write the valid flag word; if m > 3, directly report an error and no longer record abnormal data;

[0017] S6. During patrol inspection or record query, perform a read operation on the recorded data in the laser gyroscope. This read operation first reads the model and factory basic parameters of the laser gyroscope, and then reads the data in the recording area, including normal working data or abnormal working data. When the read valid flag word is correct, this piece of data is complete and valid; when the read valid flag word is incorrect, it indicates that this piece of data record is incomplete and determines that this data is invalid;

[0018] S7. After the operating state data of the laser gyroscope is read into the upper computer, the upper computer estimates the life of the laser gyroscope based on the light intensity and jitter drive voltage in the operating state data.

[0019] Further, the startup of the laser gyroscope control system in step S1 includes: the high-voltage circuit of the laser gyroscope outputs an ultra-high voltage to ignite and light the laser gyroscope; the frequency stabilization circuit outputs a frequency stabilization voltage to adjust the cavity length of the laser gyroscope so that the laser gyroscope operates in a suitable operating mode; the dither control circuit outputs a dither drive signal to drive the dither wheel to make the dither wheel vibrate back and forth, realizing the dither frequency biasing of the laser gyroscope.

[0020] Further, the state data of the laser gyroscope in step S2 includes the power-on time, startup time, normal working data record, and abnormal data record. The data record includes zero-bias mean, dither frequency, sum frequency, frequency stabilization, DC optical intensity, dither drive, dither feedback, noise, and temperature.

[0021] Further, in step S4, if a system power failure or a fault anomaly occurs and the valid flag word of the data record or the mean record fails to complete a correct write operation, the data in the data record area or the mean record area is considered invalid.

[0022] Compared with the prior art, the advantages of the present invention are as follows: The present invention can collect and record the on-site application data of the laser gyroscope, and monitor the state and life of the laser gyroscope based on the on-site application data, with the advantages of simple system structure and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 It is a schematic diagram of the state and life monitoring system of the laser gyroscope based on ferroelectric storage according to the embodiment of the present invention.

[0025] Figure 2 It is a program block diagram of writing records in the laser gyroscope state data recording method provided by the embodiment of the present invention.

[0026] Figure 3 It is a program block diagram of reading records in the laser gyroscope state data recording method provided by the embodiment of the present invention.

[0027] Figure 4 It is a schematic diagram of light intensity and life determination in the laser gyroscope life monitoring method provided by the embodiment of the present invention.

[0028] Figure 5 It is a schematic diagram of dither drive and life determination in the laser gyroscope life monitoring method provided by the embodiment of the present invention. Detailed implementation mode

[0029] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making the protection scope of the present invention more clearly defined.

[0030] Refer to Figure 1 As shown, this embodiment discloses a laser gyroscope state and life monitoring system based on ferroelectric storage, including a laser gyroscope body and a laser gyroscope control system.

[0031] In this embodiment, the laser gyroscope body includes a laser resonator 110, a cathode 102, two anodes 103, a dither wheel 107 and a beam combining prism 108. The laser resonator 110 is composed of a microcrystalline glass cavity 101, two plane mirrors 104 and two spherical mirrors 105. Two beams of laser running in opposite directions are generated in the laser resonator 110. Piezoelectric ceramics 106 for stabilizing the cavity length of the laser resonator 110 are installed on the two spherical mirrors 105. A cathode 102 and two anodes 103 are also installed in the laser resonator 110. The double-anode structure is used to eliminate the Langmuir zero drift. The microcrystalline glass cavity 101 is supported on the dither wheel 107. Piezoelectric ceramics are attached to the spokes of the dither wheel 107. The dither wheel 107 is driven by the deformation of the piezoelectric ceramics to drive the cavity 101 to vibrate back and forth to generate positive and negative alternating dither offsets. The beam combining prism 108 is installed on one of the plane mirrors 104.

[0032] In this embodiment, the laser gyroscope control system includes a microcontroller 201, a laser gyroscope high-voltage circuit 202, a frequency stabilization circuit 203, a dither control circuit 204, an AC output small-signal processing circuit 205, a ferroelectric memory 206, a button battery 207, and a communication interface 209 connected to the microcontroller 201. The laser gyroscope high-voltage circuit 202 is respectively connected to a cathode 102 and two anodes 103. The frequency stabilization circuit 203 is connected to a DC phototube on a plane mirror 104 and two piezoelectric ceramics 106. The dither control circuit 204 is connected to a dither wheel 107. The AC output small-signal processing circuit 205 is connected to an AC phototube on a beam-combining prism 108. The ferroelectric memory 206 is used to record the state data during the operation of the laser gyroscope, and monitor and estimate the lifespan of the laser gyroscope according to the state data. The communication interface 209 is used for data communication and interaction between the laser gyroscope control system and the upper computer during equipment inspection. The button battery 207 powers the microcontroller 201 to maintain the operation of the real-time clock unit RTC 208 of the microcontroller 201. The ferroelectric memory 206 is connected and communicates with the microcontroller MCU 201, and is used to record the state data during the operation of the laser gyroscope. The communication interface 209 is used for data communication and interaction between the laser gyroscope control system and the upper computer during equipment inspection.

[0033] Specifically, the two plane mirrors 104 and the two spherical mirrors 105 are oppositely arranged at the four corners of the laser resonator 110.

[0034] Specifically, the two anodes 103 are respectively arranged on the laser resonator 110 between the two plane mirrors 104 and the two spherical mirrors 105, and one cathode 102 is installed on the laser resonator 110 between the two spherical mirrors 105.

[0035] As Figure 2 shown, the present invention also provides a method for a laser gyroscope state and lifespan monitoring system based on ferroelectric storage as described above, including the following steps:

[0036] Step S1: The laser gyroscope is powered on and starts up, and the laser gyroscope control system is started, that is, the control program in the microcontroller 201 will start each module circuit to work. For example, the laser gyroscope high-voltage circuit 202 will output a high voltage to light up the laser gyroscope; the frequency stabilization circuit 203 will output a frequency-stabilized voltage to adjust the cavity length of the laser gyroscope resonator 110 so that the laser gyroscope operates in a suitable working mode; the dither control circuit 204 will output a driving signal to make the dither wheel 107 perform reciprocating dithering to generate positive and negative alternating dither frequency offsets.

[0037] Step S2: Start the recording subroutine for the operating state of the laser gyroscope. This subroutine reads the address of the current data recording area of the ferroelectric memory, adds the address offset, and assigns the result to the address pointer. The recording subroutine will jump to the new address to start the data recording operation. Among them, the state data recorded by the laser gyroscope state recording subroutine includes the power-on time, startup time, normal working data recording, and abnormal data recording. The data recording includes zero-bias mean, dither frequency, sum frequency, frequency stabilization, DC optical intensity, dither drive, dither feedback, noise, and temperature.

[0038] Step S3: The recording subroutine will record the power-on time, read out the factory data preset in the ferroelectric memory, perform an error operation on the current operating data of the laser gyroscope and the factory data. When the error is less than the set threshold, it means that the laser gyroscope starts to work normally. Record the time interval between this moment and the power-on moment as the startup time of this laser gyroscope work. Set the normal data recording parameter n = 1 and the abnormal data recording parameter m = 1, and record the current data into the data recording area and the mean value recording area of the starting data group, and write their data valid flag words respectively.

[0039] Step S4: When the next sampling time is reached, read the current data and compare it with the factory data. If the error is less than the set threshold, assign n = n + 1. When n is odd, i = 1, corresponding to the data recording area of the first data group; when n is even, i = 2, corresponding to the data recording area of the second data group. First, clear the valid flag words of the data recording area and the mean value recording area of the i-th data group, then write the current data to the data recording area of the i-th data group, and then write the valid flag word of its data recording area to indicate that the data in this data recording area is valid. Subtract the mean value of the mean value recording area of the i-th data group from the current data, divide by n, and then sum with this mean value to obtain the current mean value. Write the current mean value to the mean value recording area of the i-th data group, overwrite the original mean value record, and write the valid flag word of its mean value recording area to indicate that the data in this mean value recording area is valid.

[0040] If there is a system power failure, fault abnormality, etc., when the data recording or mean value recording valid flag word has not completed the correct write operation, it is considered that the data in this data recording area or mean value recording area is invalid.

[0041] Step S5: If the comparison error between the currently read data and the factory data is not less than the set threshold, assign m = m + 1. If m <= 3, record the abnormal data into the abnormal data recording area in sequence and write the valid flag word; if m > 3, directly report an error and no longer record abnormal data.

[0042] Step S6: During inspection or record query, perform a read operation on the recorded data in the laser gyroscope. This read operation first reads the model and basic factory parameters of the laser gyroscope, and then reads the data in the record area, including normal working data or abnormal working data. When the read valid flag word is correct, this piece of data is complete and valid; when the read valid flag word is incorrect, it indicates that this piece of data record is incomplete, and this data is determined to be invalid.

[0043] Step S7: After the operating state data of the laser gyroscope is read into the host computer (such as Figure 4 and Figure 5 ), the host computer estimates the life of the laser gyroscope based on the light intensity and jitter drive voltage in the operating state data. For example, when the light intensity voltage decays to 30% of the original (as shown in Figure 4 ), or when the change amount of the jitter drive voltage is greater than 1 time of the jitter drive voltage (as shown in Figure 5 ), it can be determined that the laser gyroscope has reached its service life and a new laser gyroscope needs to be replaced.

[0044] The present invention can collect and record the on-site application data of the laser gyro, and monitor the state and life of the laser gyro based on the on-site application data, having the advantages of simple system structure and easy operation.

[0045] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, the patent owner can make various deformations or modifications within the scope of the appended claims. As long as it does not exceed the protection scope described by the claims of the present invention, it should be within the protection scope of the present invention.

Claims

1. A ferroelectric memory-based laser gyroscope state and life monitoring system, characterized in that It includes a laser gyroscope body and a laser gyroscope control system; The laser gyroscope body includes a laser resonator cavity, a cathode, two anodes, a dither wheel, and a beam combining prism. The laser resonator cavity is composed of a microcrystalline glass cavity body, two plane mirrors, and two spherical mirrors. Two beams of laser running in opposite directions are generated in the laser resonator cavity. Piezoelectric ceramics for stabilizing the cavity length of the laser resonator cavity are installed on the two spherical mirrors. The laser resonator cavity is also provided with a cathode and two anodes. The microcrystalline glass cavity body is supported on the dither wheel. Piezoelectric ceramics are mounted on the spokes of the dither wheel. The deformation of the piezoelectric ceramics drives the dither wheel to drive the cavity body to vibrate back and forth to generate positive and negative alternating dither frequency shifts. The beam combining prism is installed on one of the plane mirrors; The laser gyroscope control system includes a microcontroller and a laser gyroscope high-voltage circuit, a frequency stabilization circuit, a dither control circuit, an AC output small-signal processing circuit, a ferroelectric memory, a button battery, and a communication interface connected to the microcontroller. The laser gyroscope high-voltage circuit is respectively connected to a cathode and two anodes. The frequency stabilization circuit is connected to a DC phototube and two piezoelectric ceramics on one of the plane mirrors. The dither control circuit is connected to the dither wheel. The AC output small-signal processing circuit is connected to an AC phototube on the beam combining prism. The ferroelectric memory is used to record the state data when the laser gyroscope is working, and monitor and estimate the life of the laser gyroscope according to the state data. The communication interface is used for data communication and interaction between the laser gyroscope control system and the upper computer during equipment inspection; The method of the laser gyroscope state and life monitoring system based on ferroelectric storage includes the following steps: S1. The laser gyroscope is powered on and the laser gyroscope control system is started; S2. Start the recording subroutine of the laser gyroscope operating state. This subroutine reads the address of the current data recording area of the ferroelectric memory, adds the address offset and assigns it to the address pointer. The recording subroutine will jump to the new address to start the data recording operation; S3. The recording subroutine will record the power-on time, read out the factory data preset in the ferroelectric memory, perform an error operation on the current operating state data of the laser gyroscope and the factory data. When the error is less than the set threshold, it means that the laser gyroscope starts to work normally. Record the time interval between this moment and the power-on moment as the start time of this laser gyroscope work. Set the normal data recording parameter n = 1 and the abnormal data recording parameter m = 1, and record the current data into the data recording area and the mean value recording area of the starting data group, and write their valid flag words respectively; S4. When the next sampling time is reached, read the current data and compare it with the factory data. If the error is less than the set threshold, assign n = n + 1. When n is odd, i = 1, corresponding to the data record area of the first data group; when n is even, i = 2, corresponding to the data record area of the second data group. First, clear the valid flag words in the data record area and the mean record area of the i-th data group, then write the current data to the data record area of the i-th data group, and then write the valid flag word of its data record area to indicate that the data in the data record area of the i-th data group is valid. Subtract the mean value in the mean record area of the i-th data group from the current data, divide the result by n, and then sum it with the mean value to obtain the current mean value. Write the current mean value to the mean record area of the i-th data group, overwrite the original mean record, and write the valid flag word of its mean record area to indicate that the data in the mean record area is valid. S5. If the error between the currently read data and the factory data is not less than the set threshold, assign m = m + 1. If m <= 3, record the abnormal data in the abnormal data record area in sequence and write the valid flag word; if m > 3, directly report an error and stop recording abnormal data. S6. During inspection or record query, perform a read operation on the recorded data in the laser gyroscope. This read operation first reads the model and basic factory parameters of the laser gyroscope, and then reads the data in the record area, including normal working data or abnormal working data. When the read valid flag word is correct, this piece of data is complete and valid; when the read valid flag word is incorrect, it means that this piece of data record is incomplete and the data is determined to be invalid. S7. After the operating state data of the laser gyroscope is read into the host computer, the host computer estimates the life of the laser gyroscope based on the light intensity and jitter drive voltage in the operating state data. The startup of the laser gyro control system in step S1 includes: the high-voltage circuit of the laser gyro outputs an ultra-high voltage to ignite and light the laser gyro, the frequency stabilization circuit outputs a frequency stabilization voltage to adjust the cavity length of the laser gyro, so that the laser gyro works in a suitable working mode, and the jitter control circuit outputs a jitter drive signal to drive the jitter wheel to make the jitter wheel vibrate back and forth, realizing the jitter bias of the laser gyro.

2. The laser gyroscope state and life monitoring system based on ferroelectric storage according to claim 1, wherein The two plane mirrors and the two spherical mirrors are oppositely arranged at the four corners of the laser resonator.

3. The laser gyroscope state and life monitoring system based on ferroelectric memory according to claim 1, characterized in that The two anodes are respectively arranged on the laser resonator between the two plane mirrors and the two spherical mirrors, and one cathode is installed on the laser resonator between the two spherical mirrors.

4. The laser gyroscope state and life monitoring system based on ferroelectric storage according to claim 1, characterized in that The state data of the laser gyroscope in step S2 includes the power-on time, startup time, normal working data record, and abnormal data record. The data record includes zero-bias mean value, dither frequency, sum frequency, frequency stabilization, DC light intensity, jitter drive, jitter feedback, noise, and temperature.

5. The state and life monitoring system of a laser gyroscope based on ferroelectric storage according to claim 1, characterized in that In step S4, if there is a system power failure or a fault anomaly, and the valid flag word of the data record or the mean record is not correctly written, then the data in the data record area or the mean record area is considered invalid.

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