Method and device for analyzing absolute gravity of temperature to laser interference

Abstract

The invention discloses a method and a device for analyzing absolute gravity of temperature to laser interference. The analysis method comprises the following steps: determining an initial environment temperature as a measurement reference condition, and recording a laser wavelength corresponding to the initial environment temperature; gradually regulating and controlling the environment temperature to a set target temperature, and monitoring and recording the laser wavelength which is changed due to the environment temperature in real time; calculating a changed absolute gravity value according to the changed laser wavelength; and analyzing the quantitative relation between the environment temperature and the absolute gravity measurement value change through the at least two groups of laser wavelengths and the corresponding laser interference absolute gravity values. According to the technical scheme, by accurately controlling and monitoring the environment temperature change, analyzing the influence of the environment temperature change on the laser wavelength and deeply discussing the influence mechanism of the temperature change on the gravity measurement result, the precision and reliability of gravity measurement can be effectively improved, and the requirement of high-precision gravity monitoring is met.

Description

Technical Field

[0001] The present invention relates to the technical field of precision measurement, and particularly to an analysis method and device for the influence of temperature on laser interferometry absolute gravity. Background Art

[0002] The change of the gravity field is a basic physical quantity reflecting the spatio-temporal changes of the density of substances in the Earth's interior (such as the core, mantle, and crust), oceans, and atmosphere, as well as the geodynamic characteristics under various environments. High-precision gravity data are widely used in the fields of studying geodynamic processes, seismic activities, mineral resource exploration, environmental science, and the coupling effects of gravity with the ocean and atmosphere. In space science, accurate gravity field distribution information is crucial for the precise measurement of different artificial satellite orbits; in the field of national defense and military, the strike accuracy of long-range missiles and the navigation of inertial devices also rely on an accurate understanding of the changes in the Earth's gravity field. China is implementing space exploration programs such as "High-precision Space Earth Observation" and "Space Natural Disaster Monitoring Infrastructure", among which gravity monitoring is an important part. In addition, the precise absolute measurement of the surface gravity value helps to redefine basic physical quantities such as mass, and obtain more accurate values of the gravitational constant, Planck constant, and Boltzmann constant.

[0003] The measurement of gravity values is mainly carried out in two ways: relative gravimeters and absolute gravimeters. Relative gravimeters include superconducting gravimeters (SG) and models such as CG-5, CG-6, Bellres, and Lacoste. Absolute gravity measurement is based on two principles: laser interferometry and atom interferometry. The former precisely measures the trajectory of a falling object moving freely in the Earth's gravity field, and the latter uses an atomic cloud cooled by a magneto-optical trap for similar measurements.

[0004] In related technologies, absolute gravimeters measure based on the principle of laser interferometry, which is affected by the stability of the laser source, the stability of the rubidium atomic clock, etc., and is also affected by factors such as ocean tides and the atmosphere, making it difficult to guarantee the credibility, accuracy, and precision of the gravity measurement results, thus affecting the measurement results. Therefore, it is of great significance to improve the accuracy of gravity measurement. Summary of the Invention

[0005] The present invention provides an analysis method and device for the influence of temperature on laser interferometry absolute gravity to solve the problem of poor accuracy and reliability of gravity measurement.

[0006] According to the first aspect of the present invention, there is provided an analysis method for the influence of temperature on laser interferometry absolute gravity, which method is applied to an absolute gravimeter and includes:

[0007] Determine the initial ambient temperature as the measurement reference condition, and record the laser wavelength corresponding to the initial ambient temperature;

[0008] Gradually adjust the ambient temperature to the set target temperature, and monitor and record in real time the laser wavelength changed due to the ambient temperature;

[0009] Calculate the changed absolute gravity value according to the changed laser wavelength;

[0010] Analyze the quantitative relationship between the ambient temperature and the change of the absolute gravity measurement value through at least two sets of the laser wavelength and the corresponding absolute gravity value measured by laser interferometry, so as to improve the measurement accuracy of the absolute gravity measured by laser interferometry.

[0011] In one embodiment, the gradually adjusting the ambient temperature to the set target temperature and monitoring and recording in real time the laser wavelength changed due to the ambient temperature includes:

[0012] Use an iodine-stabilized laser as the frequency reference light source, and perform heterodyne measurement on the beam of the helium-neon laser to be measured and the beam of the reference laser;

[0013] Continuously record the heterodyne signal in real time to obtain the real-time information of the changed laser wavelength.

[0014] In one embodiment, the calculating the changed absolute gravity value according to the changed laser wavelength includes:

[0015] Calculate the change of the interference measurement displacement caused by the change of the laser wavelength;

[0016] Use the calculated change of the interference measurement displacement to analyze the change of the corresponding absolute gravity measurement value.

[0017] In one embodiment, the using the calculated change of the interference measurement displacement to analyze the change of the corresponding absolute gravity measurement value includes:

[0018] The formula for calculating the change of the corresponding absolute gravity measurement value by using the calculated change of the interference measurement displacement is as follows:

[0019]

[0020] where, dg is the change amount of the absolute gravity, t is the falling body motion time, dλ is the change amount of the laser wavelength, and N is a constant.

[0021] In one embodiment, the monitoring and recording in real time the laser wavelength changed due to the ambient temperature includes:

[0022] Use a high-precision temperature control device to gradually and precisely adjust the ambient temperature;

[0023] Strictly control the rate of temperature change and maintain stability at each target temperature;

[0024] Perform multiple repeated measurements at each temperature state to reduce measurement errors.

[0025] In one embodiment, the analyzing the change in the corresponding absolute gravity measurement value by using the change in the interferometric displacement calculation includes:

[0026] Use high-precision optical elements to adjust the beams of the iodine-stabilized laser and the helium-neon laser to achieve precise coincidence;

[0027] Adopt a high-sensitivity avalanche photodiode for optoelectronic signal conversion;

[0028] Use a spectrum analyzer to measure the frequency difference in real time and record the data.

[0029] According to a second aspect of the present invention, there is provided an analysis device for the influence of temperature on laser interferometric absolute gravity, which is applied to an absolute gravimeter and includes:

[0030] A recording module for determining the initial ambient temperature as a measurement reference condition and recording the laser wavelength corresponding to the initial ambient temperature;

[0031] A monitoring module for gradually adjusting the ambient temperature to a set target temperature, and monitoring and recording in real time the laser wavelength changed due to the ambient temperature;

[0032] A calculation module for calculating the changed absolute gravity value according to the changed laser wavelength;

[0033] An analysis module for analyzing the quantitative relationship between the ambient temperature and the change in the absolute gravity measurement value through at least two sets of the laser wavelength and the corresponding laser interferometric absolute gravity value, so as to improve the measurement accuracy of the laser interferometric absolute gravity.

[0034] According to a third aspect of the present invention, there is provided an electronic device, which includes: a communication interface, a processor, and a memory;

[0035] In one embodiment, the recording module, the monitoring module, the calculation module, and the analysis module are controlled to execute any one of the above methods for analyzing the influence of temperature on laser interferometric absolute gravity.

[0036] Wherein, the memory is used to store program instructions, and when the program instructions are executed by the processor communicatively connected to the memory through the communication interface, any one of the above methods for analyzing the influence of temperature on laser interferometric absolute gravity is implemented.

[0037] According to a fourth aspect of the present invention, there is provided a computer-readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a computer (e.g., a processor in the computer), any of the above temperature analysis methods for laser interferometric absolute gravity is implemented.

[0038] In summary, the present invention provides a method and apparatus for analyzing the influence of temperature on laser interferometric absolute gravity. The method includes: determining an initial ambient temperature as a measurement reference condition and recording the laser wavelength corresponding to the initial ambient temperature; gradually adjusting the ambient temperature to a set target temperature, and real-time monitoring and recording the laser wavelength changed due to the ambient temperature; calculating the changed absolute gravity value according to the changed laser wavelength; analyzing the quantitative relationship between the ambient temperature and the change in the absolute gravity measurement value through at least two sets of the laser wavelengths and the corresponding laser interferometric absolute gravity values, so as to improve the measurement accuracy of laser interferometric absolute gravity.

[0039] The technical solution of the present application analyzes the influence of accurately controlling and monitoring the ambient temperature change on the laser wavelength, and deeply explores the influence mechanism of temperature change on the gravity measurement result. It helps to identify and quantify the specific influencing factors of the ambient temperature on the gravity measurement accuracy, and provides a scientific basis for optimizing the gravity measurement technology. By establishing a quantitative relationship model between the ambient temperature and the gravity measurement value, the accuracy and reliability of gravity measurement can be effectively improved, meeting the requirements of high-precision gravity monitoring.

[0040] Other features and advantages of the present invention will be described in the following specification, and part of them will become obvious from the specification or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the written specification and the drawings.

[0041] The technical solution of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0042] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0043] Figure 1 It is a flowchart of a method for analyzing the influence of temperature on laser interferometric absolute gravity provided for an embodiment of the present invention;

[0044] Figure 2Schematic diagram of gravity changes caused by temperature decrease and increase provided by an embodiment of the present invention;

[0045] Figure 3 Another schematic diagram of gravity changes caused by temperature decrease and increase provided by an embodiment of the present invention;

[0046] Figure 4 Structural diagram of an analysis device for temperature on laser interference absolute gravity provided by an embodiment of the present invention;

[0047] Figure 5 Structural diagram of an electronic device provided by an embodiment of the present invention. Detailed implementation manners

[0048] The features and exemplary embodiments of various aspects of the present application will be described in detail below. For the purpose of making the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than limiting the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0049] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the process, method, article or device including the said elements.

[0050] As Figure 1 shown, the present invention provides an analysis method for temperature on laser interference absolute gravity. The analysis method for temperature on laser interference absolute gravity is applied to an absolute gravimeter and includes:

[0051] In step S11, determine the initial ambient temperature as the measurement reference condition and record the laser wavelength corresponding to the initial ambient temperature;

[0052] In step S12, the environmental temperature is gradually adjusted to the set target temperature, and the laser wavelength that changes due to the environmental temperature is monitored and recorded in real time;

[0053] In step S13, the absolute gravity value that changes is calculated according to the changed laser wavelength;

[0054] In step S14, through at least two sets of the laser wavelength and the corresponding absolute gravity value measured by laser interferometry, the quantitative relationship between the environmental temperature and the change in the absolute gravity measurement value is analyzed to improve the measurement accuracy of the absolute gravity measured by laser interferometry.

[0055] In one embodiment, the measurement accuracy of the absolute gravity measured by laser interferometry is improved by quantitatively analyzing the change in the laser wavelength caused by the temperature change. To ensure the reliability and accuracy of the experimental data, the experiment should be carried out in an environment with the smallest temperature change and little air flow. The ideal laboratory environment should be equipped with a temperature control system to avoid interference from external environmental factors on the experimental results. At the same time, the vibration and electromagnetic interference of the environment should also be avoided as much as possible to ensure the measurement accuracy of the laser wavelength. The initial environmental temperature needs to be measured using a high-precision temperature sensor (such as a platinum resistance temperature sensor or a thermocouple). At the initial environmental temperature, the wavelength of the laser is accurately measured using a high-precision spectrometer (such as a Fourier transform infrared spectrometer). This recorded wavelength serves as a reference, and subsequent experimental data will be compared with it. The measurement of the laser wavelength needs to ensure high resolution and high stability because the slightest change in the laser wavelength directly affects the interference measurement result.

[0056] To achieve precise temperature regulation, in this embodiment, a high-precision temperature control device such as a precision temperature control box or a constant temperature chamber is used. The temperature control system should be able to accurately control the temperature fluctuation within the set temperature range. The selection of the temperature control device should consider the adjustment accuracy, response time, and environmental stability of the device. The change in the environmental temperature should be carried out gradually to ensure that the steady-state conditions of each temperature change can be accurately recorded. During the temperature adjustment process, after reaching each set temperature, it should be kept stable for a period of time to ensure that all physical parameters within the system (such as the temperature of the laser, the temperature of the detector, etc.) stabilize and eliminate the influence of possible instantaneous changes. At each set temperature, a spectrometer is used to monitor and record the change in the laser wavelength in real time. By continuously monitoring the wavelength change data, quantitative data on the change in the laser wavelength caused by the temperature can be obtained. These data will provide a basis for the subsequent calculation of the gravity change. During the experiment, each temperature point and the corresponding wavelength data should be accurately recorded, and a data management software is used for storage and analysis. The data management software can help researchers quickly organize the experimental data, perform error analysis, and provide the necessary support for subsequent calculations and model establishment.

[0057] After obtaining multiple sets of temperature and corresponding wavelength and gravity value data, statistical analysis and fitting are carried out to establish a quantitative relationship between environmental temperature and gravity change. Through the fitting model, the functional form of the influence of temperature change on gravity measurement can be obtained. Through multiple sets of experimental data, regression analysis methods (such as the least squares method) can be used to establish the relationship between temperature and gravity change. Regression analysis can help researchers accurately quantify the influence of environmental temperature on gravity measurement and provide guidance for equipment calibration and error correction. After establishing the model, additional experimental data is needed for verification to ensure the accuracy of the model. The verification process includes substituting the experimental data into the model for prediction and comparing it with the actual measurement results. By optimizing the model, the measurement accuracy can be improved and the error caused by environmental temperature change can be reduced.

[0058] The laser is the core component of an absolute gravimeter based on the laser interference principle, and the stability of its frequency directly affects the measurement accuracy of the absolute gravimeter. Although lasers usually use materials with low thermal expansion coefficients (such as helium-neon lasers) to manufacture resonator spacers to ensure frequency stability, fluctuations in environmental temperature or the heating effect during the operation of the laser tube will still cause the cavity material to expand and contract due to temperature changes, thereby causing drift and instability of the laser frequency.

[0059] In this embodiment, the change in wavelength stability caused by temperature change can be calculated by the following formula:

[0060]

[0061] Where α is the linear expansion coefficient of the resonator spacer material, ΔT is the temperature change, λ is the wavelength of the iodine-stabilized laser, and dλ is the change in wavelength. Invar is generally used as the resonator spacer material, and its linear expansion coefficient is as follows:

[0062] α = 9×10 -7 / ℃(2)

[0063] When the temperature rises by 0.7℃, the change in wavelength can be calculated using formula 1 to be approximately 1×10 -7 nm. Next, the gravity change caused by the change in wavelength will be derived.

[0064] The gravitational acceleration g expressed by time t and displacement s is:

[0065]

[0066] Taking the derivative of the above formula with respect to s, the gravity change caused by displacement can be obtained:

[0067]

[0068] The displacement is generally an integer multiple of half the wavelength, that is:

[0069]

[0070] Derive the displacement change caused by the wavelength change by taking the derivative of the above formula with respect to the wavelength:

[0071]

[0072] Substitute Equation 6 into Equation 4 to obtain the gravity change formula caused by the wavelength change:

[0073]

[0074] The falling time is about 0.33 s, g is the average gravitational acceleration on the earth's surface. According to Equation 5, the displacement is about 0.53361 m. When the laser wavelength takes the standard wavelength, N can be calculated to be 1.6859×10 6 . The gravity change caused by the wavelength change can be obtained from Equation 7. When the temperature rises by 0.7 °C, the gravity change is 0.2 μGal. When the temperature rises by 10 °C, the influence on gravity measurement is 2.8 μGal.

[0075] In the laboratory, an iodine-stabilized laser is used as the standard light source. The standard laser wavelength is 632.991212592 nm, which is the highest reference device in this frequency field at present. Another helium-neon laser is used as the comparison measurement laser light source. The differential frequency comparison measurement method is often used between two similar devices. After the frequencies of the two lasers are stabilized, the output laser beams are adjusted to coincide in the optical path by using total reflection mirrors and semi-transparent semi-reflection mirrors, and then enter the avalanche photodiode. After photoelectric conversion and broadband amplification, they enter the spectrum analyzer for observation. The iodine-stabilized laser can be stabilized on 7 iodine absorption components. Beat the f component. After the frequency is stabilized and the peak value of the spectral signal reaches -3 dB, the measurement is carried out. Generally, the measurement is continuously carried out for 30 minutes, and the average value of the output wavelength during this period is used as the final result. When the environmental temperature fluctuates, the laser used in the absolute gravimeter will cause the drift of the laser frequency and the change of the wavelength. The drift of the length reference of the absolute gravimeter will affect the absolute gravity measurement value. During the measurement, keep other environmental parameters basically unchanged, control the environmental temperature, the temperature drops from 22 °C to 20 °C, and then increases from 20 °C to 30 °C. Measure a set of wavelength values every hour, and the heating process lasts for 13 hours.

[0076] A total of 12 groups of observation data were obtained during the experiment. It can be seen that the wavelength gradually decreases during cooling, while the wavelength gradually increases during heating. Table 1 shows the experimental results of the influence of temperature on the laser wavelength. The gravity changes caused by temperature decrease and increase are shown in Appendix Figure 2 and Appendix Figure 3 .

[0077] Table 1

[0078]

[0079]

[0080] When the temperature rises from 20 °C to 30 °C, the wavelength increases by 4×10 -6 nm, and the resulting impact on gravity measurement is calculated using formula 7 to be 6.2 μGal. As the temperature increases, the wavelength increases linearly, and the gravity change increases linearly. During the experiment, when the temperature rises by 10 °C, the gravity change is higher than the theoretical calculated value by (2.8 μGal).

[0081] The technical solution in this embodiment analyzes the impact of precisely controlling and monitoring environmental temperature changes on the laser wavelength, and deeply explores the impact mechanism of temperature changes on gravity measurement results. It helps to identify and quantify the specific influencing factors of environmental temperature on gravity measurement accuracy, providing a scientific basis for optimizing gravity measurement technology. By establishing a quantitative relationship model between environmental temperature and gravity measurement values, the accuracy and reliability of gravity measurement can be effectively improved to meet the requirements of high-precision gravity monitoring.

[0082] In one embodiment, Figure 4 is a block diagram of an analysis device for the effect of temperature on laser interference absolute gravity shown according to an exemplary embodiment. As Figure 4 shown, the analysis device for the effect of temperature on laser interference absolute gravity, which is applied to an absolute gravimeter, includes a recording module 41, a monitoring module 42, a calculation module 43, and an analysis module 44.

[0083] The recording module 41 is used to determine the initial environmental temperature as the measurement reference condition and record the laser wavelength corresponding to the initial environmental temperature;

[0084] The monitoring module 42 is used to gradually adjust the environmental temperature to the set target temperature, and to monitor and record in real time the laser wavelength that changes due to the environmental temperature;

[0085] The calculation module 43 is used to calculate the changed absolute gravity value according to the changed laser wavelength;

[0086] The analysis module 44 is used to analyze the quantitative relationship between the environmental temperature and the change in the absolute gravity measurement value through at least two sets of the laser wavelength and the corresponding laser interference absolute gravity value, so as to improve the measurement accuracy of laser interference absolute gravity.

[0087] The recording module 41, the monitoring module 42, the calculation module 43, and the analysis module 44 included in the block diagram of the analysis device for the effect of temperature on laser interference absolute gravity are controlled to execute the analysis method of the effect of temperature on laser interference absolute gravity described in any of the above embodiments.

[0088] As Figure 5 shown, the present invention provides an electronic device 500, which includes a communication interface, a processor 501, and a memory 502;

[0089] Among them, the memory 502 is used to store program instructions. When the program instructions are executed by the processor 501 communicatively connected to the memory 502 through the communication interface, the initial ambient temperature is determined as the measurement reference condition, and the laser wavelength corresponding to the initial ambient temperature is recorded; the ambient temperature is gradually adjusted to the set target temperature, and the laser wavelength changed due to the ambient temperature is monitored and recorded in real time; according to the changed laser wavelength, the changed absolute gravity value is calculated; through at least two groups of the laser wavelengths and the corresponding laser interference absolute gravity values, the quantitative relationship between the ambient temperature and the change of the absolute gravity measurement value is analyzed to improve the measurement accuracy of the laser interference absolute gravity.

[0090] The present invention provides a computer-readable storage medium, on which computer program instructions are stored. When the computer program instructions are executed by a processor, the initial ambient temperature is determined as the measurement reference condition, and the laser wavelength corresponding to the initial ambient temperature is recorded; the ambient temperature is gradually adjusted to the set target temperature, and the laser wavelength changed due to the ambient temperature is monitored and recorded in real time; according to the changed laser wavelength, the changed absolute gravity value is calculated; through at least two groups of the laser wavelengths and the corresponding laser interference absolute gravity values, the quantitative relationship between the ambient temperature and the change of the absolute gravity measurement value is analyzed to improve the measurement accuracy of the laser interference absolute gravity.

[0091] It should be understood that the specific features, operations, and details described above regarding the method of the present invention can be similarly applied to the device and system of the present invention, or vice versa. In addition, each step of the method of the present invention described above can be executed by the corresponding components or units of the device or system of the present invention.

[0092] It should be understood that each module / unit of the device of the present invention can be implemented in whole or in part by software, hardware, firmware, or a combination thereof. Each module / unit can be embedded in the processor of the computer device in the form of hardware or firmware or independent of the processor, or can be stored in the memory of the computer device in the form of software for the processor to call to execute the operations of each module / unit. Each module / unit can be implemented as an independent component or module, or two or more modules / units can be implemented as a single component or module.

[0093] In one embodiment, a computer device is provided, which includes a memory and a processor. Computer instructions executable by the processor are stored on the memory. When the computer instructions are executed by the processor, the processor is instructed to execute the steps of the method according to the embodiments of the present invention. The computer device can generally be a server, a terminal, or any other electronic device with necessary computing and / or processing capabilities. In one embodiment, the computer device may include a processor, a memory, a network interface, a communication interface, etc. connected through a system bus. The processor of the computer device can be used to provide necessary computing, processing, and / or control capabilities. The memory of the computer device may include a non-volatile storage medium and an internal memory. An operating system, a computer program, etc. may be stored in or on the non-volatile storage medium. The internal memory can provide an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface and the communication interface of the computer device can be used to connect and communicate with external devices through a network. When the computer program is executed by the processor, the steps of the method according to the present invention are executed.

[0094] The present invention can be implemented as a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method according to the embodiments of the present invention are caused to be executed. In one embodiment, the computer program is distributed among a plurality of network-coupled computer devices or processors, so that the computer program is stored, accessed, and executed in a distributed manner by one or more computer devices or processors. A single method step / operation, or two or more method steps / operations, can be executed by a single computer device or processor or by two or more computer devices or processors. One or more method steps / operations can be executed by one or more computer devices or processors, and one or more other method steps / operations can be executed by one or more other computer devices or processors. One or more computer devices or processors can execute a single method step / operation, or execute two or more method steps / operations.

[0095] Those of ordinary skill in the art can understand that the method steps of the present invention can be implemented by a computer program to direct relevant hardware such as a computer device or a processor. The computer program can be stored in a non-transitory computer-readable storage medium. When the computer program is executed, the steps of the present invention are caused to be executed. Depending on the circumstances, any reference herein to a memory, storage, database, or other medium may include non-volatile and / or volatile memory. Examples of non-volatile memory include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), flash memory, magnetic tape, floppy disk, magneto-optical data storage device, optical data storage device, hard disk, solid state disk, etc. Examples of volatile memory include random access memory (RAM), external cache memory, etc. By precisely controlling and monitoring the environmental temperature changes and analyzing their impact on the laser wavelength, the mechanism of temperature change on the gravity measurement results is explored in depth. It helps to identify and quantify the specific influencing factors of environmental temperature on the gravity measurement accuracy and provides a scientific basis for optimizing the gravity measurement technology. By establishing a quantitative relationship model between the environmental temperature and the gravity measurement value, the accuracy and reliability of the gravity measurement can be effectively improved to meet the requirements of high-precision gravity monitoring.

[0096] The technical features described above can be combined arbitrarily. Although not all possible combinations of these technical features are described, any combination of these technical features should be considered to be covered by this specification as long as such a combination does not exist in contradiction.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for analyzing the influence of temperature on laser interference absolute gravity, which is applied to an absolute gravimeter, is characterized in that, Including: Determine the initial ambient temperature as the measurement reference condition, and record the laser wavelength corresponding to the initial ambient temperature; Gradually adjust the ambient temperature to the set target temperature, and monitor and record in real time the laser wavelength that changes due to the ambient temperature; Calculate the absolute gravity value that changes according to the changed laser wavelength; Analyze the quantitative relationship between the ambient temperature and the change in the absolute gravity measurement value through at least two sets of the laser wavelength and the corresponding absolute gravity value of laser interference; Calibrate the measurement value of the absolute gravimeter based on the quantitative relationship.

2. The method for analyzing the influence of temperature on laser interference absolute gravity according to claim 1, characterized in that, The gradually adjusting the ambient temperature to the set target temperature, monitoring and recording in real time the laser wavelength that changes due to the ambient temperature includes: Use an iodine-stabilized laser as the frequency reference light source, and perform heterodyne measurement on the beam of the helium-neon laser to be measured and the beam of the reference laser; Continuously record the heterodyne signal in real time to obtain real-time information on the changed laser wavelength.

3. The temperature analysis method for absolute gravity by laser interference according to claim 1, characterized in that, The calculating the absolute gravity value that changes according to the changed laser wavelength includes: Calculate the change in the interference measurement displacement caused by the change in the laser wavelength; Use the calculated change in the interference measurement displacement to analyze the change in the corresponding absolute gravity measurement value.

4. The method for analyzing the influence of temperature on laser interference absolute gravity according to claim 3, characterized in that, The using the calculated change in the interference measurement displacement to analyze the change in the corresponding absolute gravity measurement value includes: The formula for using the calculated change in the interference measurement displacement to analyze the change in the corresponding absolute gravity measurement value is shown as follows: Where, dg is the change amount of the absolute gravity, t is the falling body motion time, dλ is the change amount of the laser wavelength, and N is a constant.

5. The method for analyzing the influence of temperature on laser interference absolute gravity according to claim 1, wherein, The monitoring and recording in real time the laser wavelength that changes due to the ambient temperature includes: Use a high-precision temperature control device to gradually and precisely adjust the ambient temperature; Strictly control the temperature change rate and remain stable at each target temperature; Perform multiple repeated measurements at each temperature state to reduce measurement errors.

6. The method for analyzing the influence of temperature on laser interference absolute gravity according to claim 3, characterized in that, The using the calculated change in the interference measurement displacement to analyze the change in the corresponding absolute gravity measurement value includes: Use high-precision optical elements to adjust the beams of the iodine-stabilized laser and the helium-neon laser to achieve precise coincidence; Use a high-sensitivity avalanche photodiode for optoelectronic signal conversion; Use a spectrum analyzer to measure the frequency difference in real time and record the data.

7. An analysis device for the influence of temperature on laser interference absolute gravity, which is applied to an absolute gravimeter, is characterized in that, Including: A recording module, used to determine the initial ambient temperature as the measurement reference condition, and record the laser wavelength corresponding to the initial ambient temperature; A monitoring module, used to gradually adjust the ambient temperature to the set target temperature, and monitor and record in real time the laser wavelength that changes due to the ambient temperature; A calculation module, used to calculate the absolute gravity value that changes according to the changed laser wavelength; An analysis module, used to analyze the quantitative relationship between the ambient temperature and the change in the absolute gravity measurement value through at least two sets of the laser wavelength and the corresponding absolute gravity value of laser interference; A calibration module, used to calibrate the measurement value of the absolute gravimeter based on the quantitative relationship.

8. The temperature analysis device for laser interference absolute gravity according to claim 7, wherein: The recording module, the monitoring module, the calculation module, and the analysis module are controlled to execute the analysis method of the temperature on the absolute gravity of laser interference according to any one of claims 1-6.

9. An electronic device, characterized in that, Including: A communication interface, a processor, and a memory; Wherein, the memory is used for storing program instructions, and when the program instructions are executed by the processor communicatively connected to the memory through the communication interface, the electronic device implements the method for analyzing the temperature effect on laser interference absolute gravity according to any one of claims 1 to 6.

10. A computer-readable storage medium having program instructions stored thereon, characterized in that, When the program instructions are executed by a computer, the computer implements the method for analyzing the temperature effect on laser interference absolute gravity according to any one of claims 1 to 6.

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