Saddle-shaped non-magnetic electric heating film design and test method for atom sensor

Abstract

A method for designing and testing a saddle-shaped non-magnetic electric heating film for an atomic sensor is used for reducing magnetic field interference introduced in the heating process, and is characterized by comprising the following steps: step 1, establishing a saddle-shaped electric heating film coil magnetic field model, and determining an internal space magnetic field expression of the saddle-shaped electric heating film; step 2, determining a to-be-designed parameter and a parameter value range; step 3, constructing an objective function f; and 4, solving the optimal value of the target function f by adopting a particle swarm algorithm, and optimizing the value of f to be minimum, so as to obtain the to-be-designed parameter value of the saddle-shaped non-magnetic electric heating film, thereby completing the design and manufacturing of the saddle-shaped non-magnetic electric heating film. And step 5, carrying out residual magnetism test on the manufactured saddle-shaped non-magnetic electric heating film.

Description

Technical Field

[0001] The present invention relates to a design and test method of a saddle-shaped non-magnetic electric heating film for an atomic sensor, which can be applied to an atomic spin inertia measurement device, especially suitable for a cylindrical oven and a spherical atomic gas cell, and can meet the non-magnetic heating of the atomic gas cell, belonging to the technical field of atomic sensors. Background Art

[0002] With the development and progress of technology, atomic spin inertia measurement devices are widely used in high-precision fields such as navigation and geophysical sensing due to their excellent stability and accuracy. Currently, the research on this device mainly focuses on how to further improve its stability. The stability of the atomic spin inertia measurement system is affected by various physical factors, including temperature, magnetic field, and light field, etc.

[0003] Among them, the atomic gas cell, as its core sensitive component, needs to work in a high-temperature and non-magnetic environment. However, heating it to a high temperature will inevitably introduce magnetic field interference. Therefore, how to reduce the magnetic field interference introduced by heating is of great significance for improving the stability of this device. The present invention proposes a design and test method of a saddle-shaped non-magnetic electric heating film for an atomic sensor to reduce the magnetic field interference introduced during the heating process. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide a design and test method of a saddle-shaped non-magnetic electric heating film for an atomic sensor to reduce the magnetic field interference introduced during the heating process.

[0005] The technical solution of the present invention is as follows:

[0006] A design and test method of a saddle-shaped non-magnetic electric heating film for an atomic sensor, characterized by including the following steps:

[0007] Step 1, establish a magnetic field model of the saddle-shaped electric heating film coil, and determine the magnetic field expression in the internal space of the saddle-shaped electric heating film;

[0008] Step 2, determine the parameters to be designed and the value range of the parameters;

[0009] Step 3, construct the objective function f;

[0010] Step 4, use the particle swarm optimization algorithm to solve the optimal value of the objective function f, optimize the value of f to the minimum, that is, obtain the value of the parameters to be designed for the saddle-shaped non-magnetic electric heating film, thereby completing the design and manufacture of the saddle-shaped non-magnetic electric heating film;

[0011] Step 5, conduct a remanence test on the manufactured saddle-shaped non-magnetic electric heating film.

[0012] Step 1 includes: Selecting the center point of the saddle structure as the coordinate origin O to establish an xyz space rectangular coordinate system, and obtaining the following expression based on the Biot-Savart law:

[0013]

[0014] where B is the magnetic field value at a certain point in space, μ0 is the magnetic permeability of vacuum, I is the current magnitude, dl is the coil element vector, r is the vector from the coil element to the target point, and r is the distance from the coil element to the target point.

[0015] Step 2 includes:

[0016] a i = h i / R,

[0017]

[0018] a min ≤ a i ≤ a max (i = 1, 2,..., N),

[0019]

[0020] |n i | = 1 (i = 1, 2,..., N),

[0021]

[0022] where a i is the height-radius ratio of the saddle structure of the i-th turn of the coil, i is the coil turn number sequence number, i is a positive integer, h i is the height of the i-th turn of the saddle coil structure, R is the radius of the saddle structure, is the minimum processable spacing between adjacent coils, N is a positive integer, i.e., the number of coil turns, a max is the maximum coil size, a min is the minimum coil size, is the saddle structure expansion angle of the i-th turn of the saddle coil, is the minimum processable expansion angle spacing between adjacent coils, is the maximum coil expansion angle, is the minimum coil expansion angle, n i is the current direction.

[0023] Step 3 includes:

[0024]

[0025] where M is the number of points selected on each of the x, y, and z coordinate axes in the internal space of the saddle structure, i is the sequence number of the M selected points, and M is a positive integer. The magnetic field value at the i-th selected point on the x-axis, The magnetic field value at the i-th selected point on the y-axis, The magnetic field value at the i-th selected point on the z-axis, B (0,0,0) The magnetic field value at the coordinate origin.

[0026] In step 4, it includes: using the particle swarm optimization algorithm to optimize through multiple iterations, optimizing the value of the objective function to the minimum, and the optimal result output is the optimal parameter value to be designed for the saddle-shaped magnetic-free electrothermal film.

[0027] In step 5, it includes: producing and processing according to the optimal parameters magnified by 10 times, placing the test saddle-shaped magnetic-free electrothermal film in a magnetic shielding barrel, moving the probe of the fluxgate magnetometer through a high-precision displacement stage, and testing the uniformity of the internal magnetic field distribution.

[0028] In step 5, it includes: processing the saddle-shaped magnetic-free electrothermal film according to the optimal parameters and placing it in a magnetic shielding barrel, placing the fluxgate magnetometer inside the saddle-shaped magnetic-free electrothermal film, applying different magnitudes of current to the saddle-shaped magnetic-free electrothermal film using a constant current source to test its coil constant. The higher the magnetic field uniformity and the smaller the coil constant, the better the designed performance indicators of the saddle-shaped magnetic-free electrothermal film.

[0029] The advantages of the present invention compared with the prior art are as follows:

[0030] (1) The present invention optimizes the design of the saddle-shaped magnetic-free electrothermal film through the group optimization algorithm, minimizes the interference of the magnetic field generated by the electrothermal film to the atomic gas chamber to the greatest extent, and improves the stability and accuracy of the atomic spin inertia measurement device;

[0031] (2) The present invention provides a reliable and efficient electrothermal film design scheme for high-precision instruments such as atomic sensors, can effectively reduce the magnetic field interference introduced by the electrothermal film, and has broad engineering application prospects.

[0032] (3) The present invention gives a test method for the saddle-shaped electrothermal film, which can comprehensively evaluate the quality of the design performance. Brief Description of the Drawings

[0033] Figure 1 It is a schematic flow chart of implementing a design and test method for a saddle-shaped magnetic-free electrothermal film for an atomic sensor of the present invention. Figure 1 It includes step 1, setting constraint conditions; step 2, determining the parameters to be designed and the parameter value range; step 3, constructing an objective function; step 4, optimizing the objective function using the particle swarm algorithm; step 5, updating the optimized parameters; step 6, judging whether the maximum number of iterations is reached. If not, return to step 4. If so, enter step 7; step 7, selecting appropriate parameters to complete the design of the saddle-shaped magnetic-free electrothermal film.

[0034] Figure 2 It is a schematic diagram of the magnetic field modeling structure of the saddle-shaped electric heating film coil involved in a saddle-shaped non-magnetic electric heating film design and test method for an atomic sensor according to the present invention. Figure 2 In it, h1 is the height of the first turn of the saddle-shaped coil structure, h N is the height of the Nth turn of the saddle-shaped structure, N is a positive integer, i.e., the number of coil turns, R is the radius of the saddle-shaped structure, represents the included angle of the saddle-shaped structure, O is the coordinate origin, and xyz are the three axes of the rectangular coordinate system (i.e., the x-axis, y-axis, and z-axis).

[0035] Figure 3 It is a schematic diagram of obtaining points for constructing the objective function involved in a saddle-shaped non-magnetic electric heating film design and test method for an atomic sensor according to the present invention. Figure 3 On both sides of the origin of each axis, 3 points are taken respectively. Detailed implementation manners

[0036] Next, the present invention will be described in conjunction with the accompanying drawings ( Figures 1 - 3 ) and embodiments.

[0037] Figure 1 It is a schematic flow diagram of implementing a saddle-shaped non-magnetic electric heating film design and test method for an atomic sensor according to the present invention. Figure 2 It is a schematic diagram of the magnetic field modeling structure of the saddle-shaped electric heating film coil involved in a saddle-shaped non-magnetic electric heating film design and test method for an atomic sensor according to the present invention. Figure 3 It is a schematic diagram of obtaining points for constructing the objective function involved in a saddle-shaped non-magnetic electric heating film design and test method for an atomic sensor according to the present invention. Referring to Figures 1 to 3 as shown, a saddle-shaped non-magnetic electric heating film design and test method for an atomic sensor includes the following steps: Step 1, establish a magnetic field model of the saddle-shaped electric heating film coil, and determine the magnetic field expression in the internal space of the saddle-shaped electric heating film; Step 2, determine the parameters to be designed and the value ranges of the parameters; Step 3, construct the objective function f; Step 4, use the particle swarm optimization algorithm to solve the optimal value of the objective function f, and optimize the value of f to the minimum, that is, obtain the values of the parameters to be designed for the saddle-shaped non-magnetic electric heating film, so as to complete the design and manufacture of the saddle-shaped non-magnetic electric heating film; Step 5, perform a residual magnetic test on the manufactured saddle-shaped non-magnetic electric heating film.

[0038] In the said Step 1, it includes: selecting the center point of the saddle-shaped structure as the coordinate origin O to establish a three-dimensional rectangular coordinate system xyz, and obtaining the following expression based on the Biot-Savart law:

[0039]

[0040] Among them, B is the magnetic field value at a certain point in space, μ0 is the magnetic permeability of vacuum, I is the current magnitude, dl is the coil element vector, r is the vector from the coil element to the target point, and r is the distance from the coil element to the target point.

[0041] The step 2 includes:

[0042] a i = h i / R,

[0043] a i+1 -a i ≥ as min (i = 1, 2,..., N - 1),

[0044] a min ≤ a i ≤ a max (i = 1, 2,..., N),

[0045]

[0046] |n i | = 1(i = 1, 2,..., N),

[0047]

[0048] Among them, a i is the height - radius ratio of the saddle - shaped structure of the i - th turn of the coil, i is the coil turn number sequence number, i is a positive integer, h i is the height of the saddle - shaped coil structure of the i - th turn, R is the radius of the saddle - shaped structure, is the minimum processable spacing between adjacent coils, N is a positive integer, i.e., the number of coil turns, a max is the maximum coil size, a min is the minimum coil size, is the included angle of the saddle - shaped structure of the i - th turn of the saddle - shaped coil, is the minimum processable included - angle spacing between adjacent coils, is the maximum coil included angle, is the minimum coil included angle, n i is the current direction.

[0049] The step 3 includes:

[0050]

[0051] Among them, M is the number of points selected on each of the x, y, and z coordinate axes in the internal space of the saddle - shaped structure. M is a positive integer (for example Figure 3 in which M = 6, excluding the origin), i is the sequence number of the M selected points, represents the magnetic field value at the i - th selected point on the x - axis, It represents the magnetic field value of the i-th selected point on the y-axis. It represents the magnetic field value of the i-th selected point on the z-axis, B (0,0,0) It represents the magnetic field value at the coordinate origin.

[0052] In step 4, it includes: using the particle swarm optimization algorithm to optimize through multiple iterations, optimizing the value of the objective function to the minimum, and the output optimal result is the optimal parameter value to be designed for the saddle-shaped magnetic-free electrothermal film. In step 5, it includes: producing and processing according to the optimal parameters magnified by 10 times, placing the test saddle-shaped magnetic-free electrothermal film in a magnetic shielding barrel, moving the probe of the fluxgate magnetometer through a high-precision displacement stage, and testing the uniformity of the internal magnetic field distribution. In step 5, it includes: processing the saddle-shaped magnetic-free electrothermal film according to the optimal parameters and placing it in a magnetic shielding barrel, placing the fluxgate magnetometer inside the saddle-shaped magnetic-free electrothermal film, applying different magnitudes of current to the saddle-shaped magnetic-free electrothermal film using a constant current source to test its coil constant. The higher the magnetic field uniformity and the smaller the coil constant, the better the designed performance index of the saddle-shaped magnetic-free electrothermal film.

[0053] A design and testing method for a saddle-shaped magnetic-free electrothermal film for an atomic sensor disclosed by the present invention. This method takes the electrothermal film in the gas chamber of the atomic spin inertia measurement device as the research object. Aiming at the problem that magnetic field interference is easily introduced during the gas chamber heating process, by establishing a magnetic field model of the saddle-shaped electrothermal film and combining the particle swarm optimization method, a design method for the saddle-shaped magnetic-free electrothermal film is established, reducing the magnetic field interference introduced during the heating process and being applicable to the field of magnetic-free heating of the gas chamber of the atomic sensor.

[0054] As Figure 2 shown, where O represents the coordinate origin, x, y, z represent the three coordinate axes, jointly forming a space coordinate system, R represents the radius of the saddle-shaped structure, and h1 to hN represent the height of the saddle-shaped structure. N represents the number of coil turns. It represents the expansion angle of the saddle-shaped structure. As Figure 1 shown, according to Figure 1 the process, the specific implementation method of the present invention is as follows: Step 1, set the constraint conditions; Step 2, determine the parameters to be designed and the parameter value range; Step 3, construct the objective function; Step 4, optimize the objective function using the particle swarm algorithm; Step 5, update the optimized parameters; Step 6, judge whether the maximum number of iterations is reached. If not, return to Step 4. If so, enter Step 7; Step 7, select appropriate parameters to complete the design of the saddle-shaped magnetic-free electrothermal film.

[0055] Specifically, it includes the following content:

[0056] A saddle-shaped non-magnetic electric heating film design and testing method for atomic sensors, using a group optimization algorithm to optimize the configuration of the electric heating film for the atomic gas chamber, the core sensitive component in the atomic sensor, so that the magnetic field generated by the electric heating film has the least impact on the atomic gas chamber.

[0057] It includes the following steps:

[0058] Step 1, establish a magnetic field model of the saddle-shaped electric heating film coil and determine the magnetic field expression in the internal space of the saddle-shaped electric heating film;

[0059] Step 2, determine the parameters to be designed and their value ranges;

[0060] Step 3, construct the objective function f;

[0061] Step 4, use the particle swarm algorithm to solve the optimal value of the objective function f;

[0062] Step 5, conduct a residual magnetic test on the saddle-shaped electric heating film.

[0063] In the above-mentioned Step 1, when establishing the magnetic field model of the saddle-shaped electric heating film coil and determining the magnetic field expression in the internal space of the saddle-shaped electric heating film, the specific process is to select the center point of the saddle-shaped structure as the coordinate origin to establish a space rectangular coordinate system, and based on the Biot-Savart law, the magnetic field value B at any point in space can be expressed.

[0064]

[0065] Where μ0 is the vacuum permeability, I is the current magnitude, dl is the coil microelement vector, r is the vector from the coil microelement to the target point, and r is the distance from the coil microelement to the target point.

[0066] In the above-mentioned Step 2, when determining the parameters to be designed and their value ranges, the specific process is to determine the radius R of the saddle-shaped structure according to the actual situation, and R is a fixed value during the design process. The parameter to be optimized is the height-radius ratio a i =h i / R, the expansion angle the number of coil turns N, the current direction n i . The value ranges of the parameters are expressed as follows:

[0067] a i+1 -a i ≥as min (i=1,2,...,N-1)

[0068] a min ≤a i ≤a max (i=1,2,...,N)

[0069]

[0070] |n i | = 1 (i = 1, 2, ..., N)

[0071]

[0072] where is the minimum processable pitch, a i is the adjacent coil pitch, α max is the maximum coil size, α min is the minimum coil size, is the minimum processable pitch, is the adjacent coil angular difference, is the maximum coil angle, is the minimum coil angle.

[0073] In step 3, the objective function f is constructed. The specific process is to take the magnetic field values at M points on each of the x, y, and z axes in the internal space of the saddle structure, plus the origin of the coordinate system, and sum them up as the optimization objective. It is expressed as follows:

[0074]

[0075] where f is the objective function, represents the magnetic field value at a point on the axis, represents the magnetic field value at a point on the axis, represents the magnetic field value at a point on the axis, B (0,0,0) represents the magnetic field value at the coordinate origin.

[0076] In step 4, the particle swarm algorithm is used to solve the optimal value of the objective function f. The specific process is to use the particle swarm optimization algorithm to iterate and optimize multiple times, optimize the value of the objective function to the minimum, and the output optimal result is the value of the parameters to be designed for the saddle-shaped non-magnetic electrothermal film.

[0077] In step 5, the residual magnetism of the saddle-shaped electrothermal film is tested. The specific process is to produce and process according to the optimal parameters solved in step 4 by magnifying them by 10 times. Place the test saddle-shaped non-magnetic electrothermal film in a magnetic shielding barrel, move the probe of the fluxgate magnetometer through a high-precision displacement stage, and test the uniformity of the internal magnetic field distribution. Process the actual-sized saddle-shaped non-magnetic electrothermal according to the actual parameters and place it in a magnetic shielding barrel. Place the fluxgate magnetometer inside the saddle-shaped non-magnetic electrothermal, and apply different magnitudes of current to the saddle-shaped non-magnetic electrothermal using a constant current source to test its coil constant. The higher the magnetic field uniformity and the smaller the coil constant, the better the performance index of the designed saddle-shaped non-magnetic electrothermal.

[0078] The content not described in detail in the specification of the present invention belongs to the prior art well-known to those skilled in the art. It is hereby specified that the above description helps those skilled in the art to understand the present invention, but does not limit the protection scope of the present invention. Any implementation that is an equivalent replacement, modification, improvement, and / or simplification of the above description without departing from the substantial content of the present invention falls within the protection scope of the present invention.

Claims

1. A design and testing method for a saddle-shaped non-magnetic electric heating film for an atomic sensor, characterized in that: The following steps are involved: Step 1, establish a saddle-shaped electric heating film coil magnetic field model, and determine the magnetic field expression of the internal space of the saddle-shaped electric heating film; Step 2, determine the parameters to be designed and the parameter value range; Step 3, construct the objective function f; Step 4, using a particle swarm algorithm to solve the optimal value of the objective function f, and optimizing the value of f to the minimum, that is, obtaining the values ​​of the design parameters of the saddle-type non-magnetic electric heating film, thereby completing the design and manufacture of the saddle-type non-magnetic electric heating film; Step 5, performing a residual magnetism test on the manufactured saddle-shaped non-magnetic electric heating film.

2. The design and testing method of the saddle-shaped non-magnetic electric heating film for atomic sensors according to claim 1, characterized in that: The step 1 includes: selecting the center point of the saddle structure as the coordinate origin O to establish an xyz space rectangular coordinate system, and obtaining the following expression based on the Biot-Savart law: Where B is the magnetic field value at a point in space, μ0 is the vacuum magnetic permeability, I is the current, dl is the coil element vector, r is the vector pointing from the coil element to the target point, and r is the distance from the coil element to the target point.

3. The design and testing method of the saddle-shaped non-magnetic electric heating film for atomic sensors according to claim 1, characterized in that: The step 2 includes: a i =h i / R, a min ≤a i ≤a max (i=1,2,...,N), |n i |=1 (i=1,2,...,N), where a i is the height-to-radius ratio of the saddle-shaped structure of the i-th coil turn, i is the number of coil turns, i is a positive integer, h i is the height of the saddle coil structure of the i-th turn, R is the radius of the saddle structure, is the minimum machinable spacing between adjacent coils, N is a positive integer, i.e. the number of coil turns, a max is the maximum coil size, a min is the minimum coil size, is the saddle structure angle of the saddle coil of the i-th turn, is the minimum machinable angular spacing between adjacent coils, is the maximum coil spread angle, is the minimum coil spread angle, n i is the direction of current.

4. The design and testing method of the saddle-shaped non-magnetic electric heating film for atomic sensors according to claim 1, characterized in that: The step 3 includes: Where M is the number of points selected on the three coordinate axes x, y, and z in the internal space of the saddle structure, i is the sequence number of the M selected points, and M is a positive integer. represents the magnetic field value of the i-th selected point on the x-axis, represents the magnetic field value of the i-th selected point on the y-axis, represents the magnetic field value of the i-th selected point on the z-axis, B (0,0,0) Indicates the magnetic field value at the origin of the coordinate system.

5. The design and testing method of the saddle-shaped non-magnetic electric heating film for atomic sensors according to claim 1, characterized in that: The step 4 includes: using a particle swarm optimization algorithm to perform multiple iterations to optimize the value of the objective function to a minimum, and the output optimal result is the optimal parameter value of the saddle-type non-magnetic electric heating film to be designed.

6. The design and testing method of the saddle-shaped non-magnetic electric heating film for atomic sensors according to claim 1, characterized in that: The step 5 includes: amplifying the production and processing by 10 times according to the optimal parameters, placing the saddle-shaped non-magnetic electric heating film for testing in a magnetic shielding barrel, moving the fluxgate magnetometer probe through a high-precision translation stage, and testing the uniformity of the internal magnetic field distribution.

7. The design and testing method of the saddle-shaped non-magnetic electric heating film for atomic sensors according to claim 1, characterized in that: The step 5 includes: processing a saddle-shaped non-magnetic electric heating film according to optimal parameters and placing it in a magnetic shielding barrel, placing a fluxgate magnetometer inside the saddle-shaped non-magnetic electric heating film, and using a constant current source to apply currents of different magnitudes to the saddle-shaped non-magnetic electric heating film to test its coil constant. The higher the magnetic field uniformity and the smaller the coil constant, the better the performance index of the designed saddle-shaped non-magnetic electric heating.

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