A double-T composite high dynamic range atomic interferometry gravity measurement method and device

Abstract

The present invention discloses a double-T composite high-dynamic range atomic interferometry gravity measurement method and device, comprising: S1. Atom cooling: preparing a cold atomic cluster using a magneto-optical trap unit; S2. Atom initial state preparation: preparing an atomic ensemble in a single-component dual-momentum domain using an atomic velocity and state selection unit; S3. Double-T composite interference: after atoms enter an interference cavity, two groups of narrow-band Raman pulse sequences are used to respectively manipulate the atoms in two velocity domains to form a double-T composite interferometer; S4. Four-channel decoupling detection: using a combination of velocity-selective Raman pulses and energy-state-selective fluorescence resonance pulses to form a composite detection sequence, and using a photodetector to realize decoupling measurement of the atomic states of four output channels; S5. Raman light frequency or phase scanning: scanning the frequency or phase of the two groups of Raman light pulses of the double-T interferometer to form interference fringes; S6. Four-channel signal joint analysis: performing a joint analysis on the output signals of the four channels to calculate the gravitational acceleration value.

Description

Technical Field

[0001] The present invention relates to the technical field of gravity acceleration measurement, and in particular to a double-T composite high dynamic range atomic interferometry gravity measurement method and device. Background Art

[0002] An atom interferometer gravimeter is a device that uses the wave properties of atoms to measure gravitational acceleration. It has broad application prospects in a wide range of fields, including earthquake and sea level monitoring, precise determination of the geoid, vertical crustal deformation, national defense construction, industrial applications, resource extraction, and archaeology. The new generation of quantum absolute gravimeters, based on the principle of atomic interferometry, is the next generation of high-precision absolute gravimeters. Their measurement performance currently approaches or even surpasses that of the most advanced commercial FG5X laser interferometer absolute gravimeter, and has initially achieved demonstration applications in field gravity field mapping, underground pipeline detection, and volcanic eruption prediction. For atom interferometer gravimeters to be applied in large-scale field applications, high dynamic range and high sensitivity are two key challenges that must be addressed.

[0003] To improve the dynamic range of atomic interferometer gravimeters, researchers around the world have conducted extensive research. The main technical solutions include:

[0004] (1) The Bidel research group proposed and implemented a small T interferometer technique, which increases the dynamic range of the atomic gravimeter by reducing the Raman pulse interval T from 200 ms to 1.5-20 ms. However, since the measurement sensitivity is proportional to the square of T, this scheme sacrifices the measurement sensitivity.

[0005] (2) The Bidel group subsequently proposed and implemented a classical-quantum hybrid technology, which uses a high-resolution classical mechanical or force-balance accelerometer to preliminarily determine the range of gravitational acceleration, and then uses an atomic interferometer gravimeter to provide high-precision gravity measurement results to achieve shipborne and airborne atomic interferometry absolute gravity measurement. However, the use of classical accelerometers not only increases system cost but also has problems such as placement deviation, measurement bias, and limited response frequency, which can lead to measurement errors.

[0006] (3) The Bonnin research group proposed and implemented a two-component atomic double-T interferometry technique, which is similar to a dual-wavelength laser interferometry scheme and can simultaneously manipulate 87 Rb and 85 Rb two atoms, through the realization of T 87 = 20 ms and T 85 =47 ms double-T hybrid interferometer, or realize T 87 =T 85=47 ms dual-component orthogonal phase fully linear atom interferometer. This solution requires two sets of cooling, back-pumping, Raman, detection and blow-off light systems with a frequency difference of the order of GHz. Although it can improve the dynamic range and sensitivity, it has high hardware complexity, high cost and difficulty in adjustment.

[0007] (4) Yankelev's research group proposed and implemented the single-component atomic double-T shear interferometry technique, which simultaneously achieved The double-T transverse shear spatial interferometer increases the dynamic range by generating a joint period similar to the moiré fringe by two close scale factors. However, this solution requires a high-precision Raman light reflector piezoelectric deflection system, a high-resolution CCD imaging system, high-speed image transmission equipment, and a relatively complex image processing algorithm. The hardware is highly complex, costly, and difficult to adjust, and the software processes a large amount of data and is highly complex.

[0008] In response to the above technical problems, the present invention proposes a technical method with lower technical difficulty and cost, stronger practicality and wider application range, which can effectively improve the dynamic range and sensitivity of the atomic interferometer gravimeter at the same time. Summary of the Invention

[0009] In response to the technical problems in the prior art, the purpose of the present invention is to provide a double-T composite high-dynamic range atomic interferometry gravity measurement method and device, which can effectively improve the dynamic range and sensitivity at the same time, and promote the large-scale practical application of atomic interferometry gravimeters in the field.

[0010] To achieve the above object, the present invention provides a double-T composite high dynamic range atomic interferometry gravity measurement method, the method comprising the following steps:

[0011] Step S1. Atom cooling: using a magneto-optical trap unit and polarization gradient cooling trapping technology to prepare alkali metal cold atomic clusters with a temperature of ≤10μK, and then allowing the atoms to perform free fall in a vacuum chamber;

[0012] Step S2. Atomic initial state preparation: using an atomic velocity and state selection unit to prepare an atomic ensemble in a single-component dual-momentum domain through a set of narrow-band Raman π pulses;

[0013] Step S3. Double T composite interference: When the atoms enter the interference cavity, Two groups The narrowband Raman pulse sequence manipulates atoms in two velocity domains respectively, causing them to coherently split, reflect, and combine to form a double-T composite interferometer. Composite moiré fringes are formed by differential scale factors, increasing the dynamic range to that of a single-T interferometer. times;

[0014] Step S4. Four-channel decoupling detection: using a composite detection sequence formed by combining velocity-selective Raman pulses with energy-state-selective fluorescence resonance pulses, and using a photodetector to achieve decoupling measurement of the atomic states of the four output channels;

[0015] Step S5. Raman light frequency or phase scanning: scanning the frequency or phase of the two groups of Raman light pulses of the double-T interferometer to form interference fringes;

[0016] Step S6. Joint analysis of four-channel signals: Jointly analyze the output signals of the four channels to calculate the value of gravity acceleration.

[0017] Furthermore, in step S2, the atomic velocity and state selection unit uses a set of narrowband dual-domain atomic velocity selection Raman π pulses, combined with microwave π pulses and blow-off light pulses, to achieve initial state preparation and obtain a single-component magnetically insensitive dual-momentum state atomic ensemble.

[0018] Furthermore, in step S3, the two groups of narrowband Raman pulse sequences refer to the action timings respectively The FWHM bandwidth of the Raman π pulse is Range, interval time , Accurate to .

[0019] Furthermore, in step S4, the four-channel decoupling detection obtains four interference fringes by detecting the atomic populations of four momentum states in one falling process using a photodetector by reasonably switching the speed-selective Raman light pulse and the detection light pulse resonating with the F=2 energy state.

[0020] Furthermore, in step S5, when scanning the frequency or phase of the two groups of Raman light pulses of the double-T interferometer, the relative frequency of the Raman light should be matched with the momentum of the dual-domain atoms, and in order to form orthogonal detection, the effective phase on the final two π / 2 combined pulses should be and The difference is π / 2.

[0021] Furthermore, in step S6, the four-channel signal joint analysis includes single fringe analysis, joint fringe common mode noise suppression analysis, and double-T composite moiré fringe dynamic range enhancement analysis.

[0022] In another aspect, the present invention provides a double-T composite high dynamic range atomic interferometry gravity measurement device for implementing the above double-T composite high dynamic range atomic interferometry gravity measurement method, comprising:

[0023] A. Vacuum cavity: provides better than 10 for cold atom interference -7 Pa high vacuum environment;

[0024] B. Laser system: provides a variety of lasers for cold atom interferometry, including cooling light, pump light, Raman light, probe light and / or blow-off light;

[0025] C. Control and Signal Analysis System: This system provides electronic modules, timing control, and signal analysis software and hardware for cold atom interferometry. It sequentially controls the intensity, frequency, and phase of lasers, magnetic fields, and microwaves with nanosecond precision, collects and analyzes signals measured by photodetectors, and implements the six steps of the aforementioned dual-T composite high-dynamic range atomic interferometry gravity measurement method, outputting the local absolute gravity value.

[0026] Furthermore, the control and signal analysis system generates narrowband dual-domain atomic velocity selective pulses and interval time by controlling the laser system. Two groups Raman pulse sequence and multi-channel velocity-energy state composite detection sequence realize the accurate preparation of single-component specific fine energy state and dual-momentum state atoms, double-T parallel interference of single-component dual-momentum domain atomic ensemble, and four-channel output atomic energy state decoupling detection.

[0027] Furthermore, the signal analysis system calculates the gravitational acceleration value by performing a joint analysis on the four-channel output atomic interference signals measured by the photodetector, including single fringe analysis, joint fringe suppression common mode noise analysis and double T composite moiré fringe dynamic range enhancement analysis.

[0028] This invention addresses the bottleneck issues of limited dynamic range and sensitivity that hinder the large-scale field application of existing atomic gravimeters. It proposes a double-T composite high-dynamic range atomic interferometry gravity measurement method and device. Compared with the existing technology, the main features and innovations of this invention are as follows:

[0029] (1) The present invention adopts the single-component dual-momentum domain atomic double-T interferometry technology combined with the four-channel interference signal joint analysis technology to generate ( The double-T composite interference fringes are used, the moiré principle is used to increase the dynamic range of the atomic gravimeter, and the multi-channel interference signal joint analysis is used to suppress common mode noise and improve the measurement sensitivity of the gravimeter, thereby achieving the simultaneous improvement of practical indicators such as the dynamic range and measurement sensitivity of the atomic gravity measurement method and device.

[0030] (2) The present invention uses single-component atoms to prepare dual-momentum domain sub-atomic clusters to form a double-T interferometer, which improves the utilization efficiency of the cold atomic ensemble as a matter-wave source, thereby avoiding the need for an additional set of cooling, back-pumping, Raman, detection and blow-off light systems in the existing two-component atomic double-T interferometer. The technical difficulty and cost are lower and the practicality is stronger.

[0031] (3) The present invention uses a photodetector to realize the decoupling detection of the double-T composite four-channel output atomic interference signal, thereby avoiding the additional high-precision piezoelectric deflection system, CCD imaging system and image processing algorithm requirements of the single-component double-T shearing interferometer. The technical difficulty and cost are lower, the practicality is stronger, and the scope of application is wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Flowchart of the double-T composite high dynamic range atomic interferometry gravity measurement method according to the present invention;

[0033] Figure 2 Schematic diagram of the atomic state evolution process of the double-T composite high dynamic range atomic interferometry gravity measurement method according to the present invention;

[0034] Figure 3 Schematic diagram of the structure of the double-T composite high dynamic range atomic interferometry gravity measurement device according to the present invention;

[0035] Figure 4 The double-T compound interferometer according to the present invention utilizes Schematic diagram of the moiré pattern that increases the dynamic range of the atomic interferometer gravimeter by 7 times;

[0036] Figure 5 This is a schematic diagram showing the principle of using a double-T composite interferometer according to the present invention to jointly analyze four-channel interference signals to improve the measurement sensitivity of an atomic interferometer gravimeter. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0038] like Figure 1 As shown, the double-T composite high dynamic range atomic interferometry gravity measurement method of this embodiment includes six basic steps: atomic cooling, atomic initial state preparation, double-T composite interferometry, four-channel decoupling detection, Raman optical frequency or phase scanning, and four-channel signal joint analysis to output gravity values.

[0039] The double-T composite high dynamic range atomic interferometry gravity measurement device of this embodiment is as follows Figure 2 As shown, it includes A. vacuum chamber, B. laser system and C. control and signal analysis system. Figure 2 The device shown, after Figure 1 Following the method flow shown, the cold atom ensemble will undergo Figure 3 The atomic double-T interference process shown in the figure obtains Figure 4The moiré pattern shown in Figure 2 increases the dynamic range of the atomic interferometer gravimeter by 7 times. In addition, through the joint analysis of the four-channel interference signal, as shown in Figure 2, the dynamic range of the atomic interferometer gravimeter is increased by 7 times. Figure 5 As shown, the measurement sensitivity of the atomic interferometer gravimeter can also be improved at the same time.

[0040] Specifically, the double-T composite high dynamic range atomic interferometry gravity measurement method of this embodiment includes:

[0041] Step S1. Atom cooling: using a magneto-optical trap unit to prepare alkali metal cold atomic clusters with a temperature of ≤10 μK through magneto-optical trapping and polarization gradient cooling trapping technology, and then allowing the atoms to perform free fall in a vacuum chamber.

[0042] In this embodiment, the alkali metal atoms are 87 Rb atoms are taken as an example, in other embodiments, 87 Rb, 85 Rb, 133 Cs, etc. The above-mentioned method of making atoms perform free fall in the vacuum chamber is exemplified by free fall. In other embodiments, it can also be vertically thrown upward. In each measurement cycle, a three-dimensional magneto-optical trap and polarization gradient cooling technology are used, and the return pump light is turned off with a delay of 1ms compared to the cooling light to obtain a temperature of about 5μK and a number of about 10 8 The quantum state is of 87 Rb cold atom ensemble, the center of the three-dimensional magneto-optical trap is set to Z=0, and the moment when the cold atom ensemble starts free falling is set to t=0.

[0043] Step S2. Atomic initial state preparation: an atomic ensemble in a single-component dual-momentum domain is prepared using an atomic velocity and state selection unit through a set of narrow-band Raman π pulses.

[0044] In this embodiment, the atomic velocity and state selection unit uses a group of narrowband Raman π pulses to select the magnon energy state and momentum state, combined with microwaves, F=2 state detection light, and F=1 state blow-off light to achieve relatively pure and efficient initial state preparation, ensuring There is no atomic population in the Zeeman state and the momentum state beyond the momentum domain, and an atomic ensemble in a single-component double-momentum domain is prepared. The energy state distribution of the atomic ensemble is , abbreviated as and ,in is the reduced Planck constant, and k is the Raman laser wave vector.

[0045] Step S3. Double T compound interferometry: When the atoms enter the interferometer cavity, Two groups The narrowband Raman pulse sequence manipulates atoms in two velocity domains respectively, causing them to coherently split, reflect, and combine to form a double-T composite interferometer. Composite moiré fringes are formed by differential scale factors, increasing the dynamic range to that of a single-T interferometer. times;

[0046] In this embodiment, Figure 2 As shown, the timings of the two groups of narrowband Raman pulse sequences are , where the FWHM bandwidth of the Raman π pulse is , the FWHM bandwidth of other embodiments of Raman π pulses can be Range, interval time , accurate to In other embodiments, τ can be in the range of 0 to 1. Two sets of narrowband Raman pulse sequences respectively manipulate atoms in two velocity domains, causing them to coherently split, reflect, and combine to form two interference loops, thereby forming a double-T compound interferometer. The moiré principle is used to increase the dynamic range of the atomic interferometer gravimeter by 7 times the original range. Figure 4 As shown, other embodiments can increase the dynamic range to that of a single T interferometer. times.

[0047] Step S4. Four-channel decoupling detection: using a composite detection sequence formed by combining velocity-selective Raman pulses with energy-state-selective fluorescence resonance pulses, and using a photodetector to achieve decoupling measurement of the atomic states of the four output channels;

[0048] In this embodiment, Figure 2 As shown in FIG, the composite detection sequence is composed of a velocity-selective Raman pulse and a detection light pulse resonating with the F=2 energy state. By setting the relative frequency of the Raman pulse and switching the two light pulses appropriately, the quantum state populations of the atoms in the four output channels of the double-T composite interferometer can be detected separately, that is, 、 、 、 , these four channels output the quantum state S of the atomic ensemble i (i=1,2,3,4) are:

[0049] . (1)

[0050] Step S5. Raman light frequency or phase scanning: scanning the frequency or phase of the two groups of Raman light pulses of the double-T interferometer to form interference fringes;

[0051] In this embodiment, when scanning the frequency or phase of the two groups of Raman light pulses in the double-T interferometer, the relative frequency of the Raman light should be matched with the momentum of the dual-domain atoms, and in order to form orthogonal detection, the effective phase of the final two π / 2 combined pulses should be and The theoretical expression of the interference fringes obtained by scanning the Raman laser frequency with a phase difference of π / 2 is:

[0052] , (2)

[0053] Among them, A i and C i (i=1, 2, 3, 4) are the mean and contrast of the four interference fringes respectively, is the effective wave vector of the reverse-transmitting Raman laser, and There are two sets of double T interferometers The frequency chirp rate of the Raman laser pulse train, and is the effective phase of two pairs of π / 2 combined Raman laser pulses in the double-T interferometer. and The phase difference of π / 2 forms orthogonal detection.

[0054] Step S6. Joint analysis of four-channel signals: Jointly analyze the output signals of the four channels to calculate the value of gravity acceleration.

[0055] In this embodiment, when the interference signals S of the four output channels are obtained, i (i=1,2,3,4), by conducting a joint analysis of S1, S2 (or S3, S4), we can get Figure 4 The double-periodic composite interference fringes shown in the figure are set , when using a conventional 3-pulse Raman interferometer, the dynamic range , when using a double T compound four-channel output atomic interferometer gravimeter and setting ,Right now The dynamic range can be increased to In other embodiments, the double-T compound interferometer utilizes By forming a composite moiré pattern with differentiated scale factors, the dynamic range can be increased to the original times. On the other hand, Figure 5 As shown in the figure, further joint fringe ellipse analysis of S1 and S3 (or S2 and S4) is performed to suppress common mode noise (right), which can achieve higher gravity measurement sensitivity than traditional single fringe analysis (left).

[0056] like Figure 3 As shown, the double-T composite high dynamic range atomic interferometry gravity measurement device according to the present invention is used to implement the double-T composite high dynamic range atomic interferometry gravity measurement method, and the device includes:

[0057] A. Vacuum cavity: provides better than 10 for cold atom interference -7 Pa high vacuum environment;

[0058] B. Laser system: provides necessary cooling light, pump light, Raman light, detection light and blow-off light for cold atom interferometry;

[0059] C. Control and Signal Analysis System: This system provides the necessary electronics, timing control, and signal analysis software and hardware for cold atom interferometry. It sequentially controls the intensity, frequency, and phase of the laser, magnetic field, and microwaves with nanosecond precision, collects and analyzes the signals measured by the photodetector, and implements the six steps of the aforementioned dual-T composite high-dynamic range atomic interferometry gravity measurement method, outputting the local absolute gravitational acceleration value.

[0060] In this embodiment, the vacuum chamber includes three parts: an atom preparation unit, an atom interference unit, and an atom detection unit, which mainly include a vacuum chamber, a vacuum pump, a magnetic field coil, a microwave horn antenna, a magnetic shield, and a mechanical fixing support assembly.

[0061] In this embodiment, the laser system mainly includes a laser, a laser frequency locking unit, a laser power stabilization unit, an acousto-optic modulator, an electro-optic modulator, a laser beam splitter, a laser polarization adjustment wave plate, a fiber coupler, a single-mode polarization-maintaining fiber, a laser beam expander, a laser reflector, an optical lens, a photodetector, and an optical fixed support assembly.

[0062] In this embodiment, the control and signal analysis system mainly includes a power supply switch, a current driver, a radio frequency and microwave source, a digital / analog signal input / output card, a computer, a timing control and analysis software, a control and signal output display screen, etc. The control system generates narrowband dual-domain atomic velocity selective pulses, interval time by controlling the laser system. Two groups A Raman pulse sequence and a multi-channel velocity-energy state composite detection sequence enable the precise preparation of single-component specific fine energy state dual-momentum state atoms, dual-T parallel interferometry of a single-component dual-momentum domain atomic ensemble, and decoupled detection of four-channel output atomic energy states. The signal analysis system performs a joint analysis of the four-channel output atomic interferometry signals measured by the photodetector, including single fringe analysis, joint fringe common-mode noise suppression analysis, and dual-T composite moiré fringe dynamic range enhancement analysis, to calculate the gravitational acceleration value and achieve simultaneous improvements in dynamic range and sensitivity.

[0063] Any process or method described in the flowchart of the present invention or in other ways herein can be understood as representing a module, segment or portion of code including one or more executable instructions for implementing specific logical functions or process steps, which can be implemented in any computer-readable medium for use by an instruction execution system, device or apparatus. The computer-readable medium can be any medium that stores, communicates, propagates or transmits a program for use by an execution system, device or apparatus, including read-only memory, magnetic disk or optical disk, etc.

[0064] Throughout this specification, reference to terms such as "embodiment" and "example" indicates that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, those skilled in the art may combine or integrate different embodiments or examples described in this specification, as well as features therein, without creating any inconsistency.

[0065] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed above with reference to the preferred embodiment, it is not intended to limit the present invention. Therefore, any simple modifications, equivalent variations, and modifications to the above embodiment that do not depart from the technical solution of the present invention and are based on the technical essence of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A double-T composite high dynamic range atomic interferometry gravity measurement method, characterized in that: The method comprises the following steps: Step S1. Atom cooling: using a magneto-optical trap unit and polarization gradient cooling trapping technology to prepare alkali metal cold atomic clusters with a temperature of ≤10μK, and then allowing the atoms to perform free fall in a vacuum chamber; Step S2. Atomic initial state preparation: using an atomic velocity and state selection unit to prepare an atomic ensemble in a single-component dual-momentum domain through a set of narrow-band Raman π pulses; Step S3. Double T composite interference: When the atoms enter the interference cavity, Two groups The narrowband Raman pulse sequence manipulates atoms in two velocity domains separately. , so that it can coherently split, reflect, and combine the beams to form a double-T composite interferometer, and form composite moiré fringes through differential scale factors, which increases the dynamic range to 1 / ( ) times; the two groups of narrow-band Raman pulse sequences refer to the action timings respectively Two sets of Raman pulse sequences; Step S4. Four-channel decoupling detection: using a composite detection sequence formed by combining velocity-selective Raman pulses with energy-state-selective fluorescence resonance pulses, and using a photodetector to achieve decoupling measurement of the atomic states of the four output channels; Step S5. Raman light frequency or phase scanning: scanning the frequency or phase of the two groups of Raman light pulses of the double-T interferometer to form interference fringes; Step S6. Joint analysis of four-channel signals: Jointly analyze the output signals of the four channels to calculate the value of gravity acceleration.

2. The double-T composite high dynamic range atomic interferometry gravity measurement method according to claim 1, characterized in that: In step S2, the atomic velocity and state selection unit uses a set of narrowband dual-domain atomic velocity selection Raman π pulses, combined with microwave π pulses and blown-off light pulses, to achieve initial state preparation and obtain a single-component magnetically insensitive dual-momentum state atomic ensemble.

3. The double-T composite high dynamic range atomic interferometry gravity measurement method according to claim 1, characterized in that: In step S3, the FWHM bandwidth of the Raman π pulse is between 0.7 and 1.3 Range, interval time ,in, , Accurate to .

4. The double-T composite high dynamic range atomic interferometry gravity measurement method according to claim 1, characterized in that: In step S4, the four-channel decoupling detection detects the atomic populations of four momentum states in one falling process using a photodetector by reasonably switching the speed-selective Raman light pulse and the detection light pulse resonating with the F=2 energy state, thereby obtaining four interference fringes.

5. The double-T composite high dynamic range atomic interferometry gravity measurement method according to claim 1, characterized in that: In step S5, when scanning the frequency or phase of the two groups of Raman light pulses of the double-T interferometer, the relative frequency of the Raman light should be matched with the momentum of the dual-domain atoms, and in order to form orthogonal detection, the effective phase on the final two π / 2 combined pulses should be and The difference is π / 2.

6. The double-T composite high dynamic range atomic interferometry gravity measurement method according to claim 1, characterized in that: In step S6, the analysis includes single fringe analysis, combined fringe common mode noise suppression analysis, and double-T composite moiré fringe dynamic range enhancement analysis.

7. A double-T composite high dynamic range atomic interferometry gravity measurement device, used to implement the double-T composite high dynamic range atomic interferometry gravity measurement method according to any one of claims 1 to 6, characterized in that: include: A. Vacuum cavity: provides better than 10 for cold atom interference -7 Pa high vacuum environment; B. Laser system: provides a variety of lasers for cold atom interferometry, including cooling light, pump light, Raman light, probe light and / or blow-off light; C. Control and Signal Analysis System: Provides electronic modules, timing control, and signal analysis software and hardware for cold atom interferometry, implements the dual-T composite high-dynamic range atomic interferometry gravity measurement method, and outputs the local absolute gravity value.

8. The double-T composite high dynamic range atomic interferometry gravity measurement device according to claim 7, characterized in that: The control and signal analysis system sequentially controls the intensity, frequency and phase of the laser, magnetic field and microwave with nanosecond precision and collects and analyzes the signals measured by the photoelectric detector.

9. The double-T composite high dynamic range atomic interferometry gravity measurement device according to claim 7 or 8, characterized in that: The control and signal analysis system generates narrow-band dual-domain atomic velocity selective pulses and interval time by controlling the laser system. Two groups Raman pulse sequence, multi-channel velocity-energy state composite detection sequence, , realizing the accurate preparation of single-component specific fine energy state and dual-momentum state atoms, double-T parallel interference of single-component dual-momentum domain atomic ensemble, and four-channel output atomic energy state decoupling detection.

10. The double-T composite high dynamic range atomic interferometry gravity measurement device according to claim 8, characterized in that: The signal analysis system calculates the gravitational acceleration value by performing a joint analysis on the four-channel output atomic interference signals measured by the photoelectric detector, including single fringe analysis, joint fringe suppression common mode noise analysis and double T composite moiré fringe dynamic range enhancement analysis.

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