Displacement measuring device and displacement measuring method

Abstract

The present invention discloses a displacement measuring device and a displacement measuring method. The displacement measuring device includes: a linear magnetic induction array, comprising a plurality of magnetic induction sensors arranged in a row along a straight line; a magnetic control switch array, arranged side by side with the linear magnetic induction array and comprising a plurality of magnetic control switches arranged in a row along a straight line; a magnet, capable of moving in a straight line relative to the linear magnetic induction array and the magnetic control switch array; a position range determination unit, determining the position range of the magnet in the straight line according to the switching states of the plurality of magnetic control switches; a signal acquisition unit, acquiring magnetic field strength signals detected by the magnetic induction sensors within the position range; and a position calculation unit, calculating the position of the magnet in the straight line according to the acquired magnetic field strength signals. Therefore, the present invention eliminates the need to acquire, process, and calculate data from all magnetic induction sensors, thereby reducing the power consumption of the displacement measuring device and improving data update frequency and detection efficiency.

Description

Technical Field

[0001] The invention relates to a displacement measuring device and a displacement measuring method. Background Art

[0002] In the prior art, a linear magnetoresistive displacement measurement system typically includes a linear magnetoresistive sensor array and a magnet. The magnet is movable relative to the linear magnetoresistive sensor array along a straight line, with multiple magnetoresistive sensors in the linear magnetoresistive sensor array arranged in a row along the straight line.

[0003] To ensure measurement accuracy, the spacing between two adjacent magnetoresistive sensors is usually relatively small, for example, 15mm. If the magnet's linear travel is large, for example, 990mm, 66 magnetoresistive sensors are required. Therefore, it is necessary to collect the detection signals of 66 magnetoresistive sensors, process the collected detection signals of 66 magnetoresistive sensors, and calculate the position of the magnet based on the collected detection signals of 66 magnetoresistive sensors. This results in high power consumption of the entire linear magnetoresistive displacement measurement system, low output update frequency of measurement results, and very low measurement efficiency, which cannot meet the requirements of high-speed measurement. Summary of the Invention

[0004] The purpose of the present invention is to solve at least one aspect of the above-mentioned problems and defects in the prior art.

[0005] According to one aspect of the present invention, there is provided a displacement measuring device, comprising: a linear magnetic induction array, comprising a plurality of magnetic induction sensors arranged in a row along a straight line; a magnetic control switch array, arranged side by side with the linear magnetic induction array and comprising a plurality of magnetic control switches arranged in a row along the straight line; a magnet capable of moving along the straight line relative to the linear magnetic induction array and the magnetic control switch array; a position range determining unit, adapted to determine a position range of the magnet in the straight line direction based on the switching states of the plurality of magnetic control switches; a signal acquisition unit, adapted to acquire magnetic field strength signals detected by the magnetic induction sensors located within the position range; and a position calculation unit, adapted to calculate the position of the magnet in the straight line direction based on the acquired magnetic field strength signals.

[0006] According to an exemplary embodiment of the present invention, when the magnetic field strength at the magnetic control switch rises above a predetermined value, the magnetic control switch is switched from a closed state to an open state; and when the magnetic field strength at the magnetic control switch drops below the predetermined value, the magnetic control switch is switched from the open state to the closed state.

[0007] According to another exemplary embodiment of the present invention, when the magnetic field strength at the magnetic control switch rises above a predetermined value, the magnetic control switch is switched from an open state to a closed state; and when the magnetic field strength at the magnetic control switch drops below the predetermined value, the magnetic control switch is switched from the closed state to the open state.

[0008] According to another exemplary embodiment of the present invention, when the magnet is in different position ranges, the combined switch states formed by the switching states of the multiple magnetic control switches are different, so that the position range of the magnet can be determined according to the switching states of the multiple magnetic control switches.

[0009] According to another exemplary embodiment of the present invention, the position of each magnetically controlled switch in the linear direction is preset and known; and the position of each magnetic induction sensor in the linear direction is preset and known.

[0010] According to another exemplary embodiment of the present invention, the number of magnetically controlled switches in the magnetically controlled switch array is less than or equal to the number of magnetic induction sensors in the linear magnetic induction array.

[0011] According to another exemplary embodiment of the present invention, the distance between two adjacent magnetic switches in the magnetic switch array is greater than or equal to the distance between two adjacent magnetic induction sensors in the linear magnetic induction array.

[0012] According to another exemplary embodiment of the present invention, a distance between two adjacent magnetic switches in the magnetic switch array is an integer multiple of a distance between two adjacent magnetic induction sensors in the linear magnetic induction array.

[0013] According to another exemplary embodiment of the present invention, each magnetically controlled switch in the magnetically controlled switch array is aligned with a corresponding magnetic induction sensor in the linear magnetic induction array.

[0014] According to another exemplary embodiment of the present invention, the displacement measuring device further includes a circuit board, and the linear magnetic induction array and the magnetic control switch array are arranged on the circuit board; the position range determination unit, the signal acquisition unit and the position calculation unit are respectively electrically connected to the multiple magnetic induction sensors and the multiple magnetic control switches via the circuit board.

[0015] According to another exemplary embodiment of the present invention, the spacing between two adjacent magnetic switches in the magnetic switch array is not less than half the wavelength of the magnetic field strength signal curve detected by the magnetic induction sensor and is less than the wavelength of the magnetic field strength signal curve detected by the magnetic induction sensor.

[0016] According to another exemplary embodiment of the present invention, the distance between two adjacent magnetic induction sensors in the linear magnetic induction array is less than half the wavelength of a magnetic field intensity signal curve detected by the magnetic induction sensor.

[0017] According to another exemplary embodiment of the present invention, a ratio of a distance between two adjacent magnetic induction sensors in the linear magnetic induction array to a wavelength of a magnetic field intensity signal curve detected by the magnetic induction sensor is within a range of 0.01 to 0.4.

[0018] According to another exemplary embodiment of the present invention, the magnetic induction sensor is a magnetoresistive sensor or a Hall sensor.

[0019] According to another aspect of the present invention, there is provided a displacement measurement method, comprising the following steps:

[0020] S100: providing the aforementioned displacement measuring device;

[0021] S200: moving the magnet along a straight line;

[0022] S300: determining a position range of the magnet in the straight line direction according to the switching states of a plurality of magnetically controlled switches;

[0023] S400: collecting magnetic field strength signals detected by the magnetic induction sensor within the position range;

[0024] S500: Calculating the position of the magnet in the straight line direction according to the collected magnetic field strength signal.

[0025] In the aforementioned exemplary embodiments of the present invention, the magnetic switch array first determines the position range of the magnet. Then, only the detection signals of the magnetic induction sensors within the determined position range are collected, and the position of the magnet is calculated based on the collected detection signals. Therefore, the present invention eliminates the need to collect, process, and calculate the detection signals of all magnetic induction sensors. This significantly reduces the power consumption of the displacement measurement device and greatly improves the data update frequency and detection efficiency of the displacement measurement device.

[0026] Other objects and advantages of the present invention will become apparent from the following description of the present invention with reference to the accompanying drawings, which will help to provide a comprehensive understanding of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram showing a displacement measuring device according to an exemplary embodiment of the present invention;

[0028] Figure 2 show Figure 1A plan view of the displacement measuring device shown, wherein the magnet is located at the magnetic switch B3;

[0029] Figure 3 show Figure 1 A plan view of the displacement measuring device is shown, in which the spacing between adjacent magnetic induction sensors and the spacing between adjacent magnetically controlled switches are indicated;

[0030] Figure 4 show Figure 1 A plan view of the displacement measuring device shown, wherein the magnet is located at the magnetic switch B1;

[0031] Figure 5 show Figure 1 The magnetic field strength signal curve detected by the magnetic induction sensor of the displacement measuring device shown;

[0032] Figure 6 A schematic diagram shows a displacement measuring device according to another exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be further described in detail below through examples and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as limiting the present invention.

[0034] In addition, in the following detailed description, for ease of explanation, numerous specific details are set forth to provide a comprehensive understanding of the disclosed embodiments. However, it is apparent that one or more embodiments can be practiced without these specific details. In other cases, well-known structures and devices are shown in diagrammatic form to simplify the accompanying drawings.

[0035] According to an overall technical concept of the present invention, a displacement measuring device is provided, comprising: a linear magnetic induction array, comprising a plurality of magnetic induction sensors arranged in a row along a straight line; a magnetic control switch array, arranged side by side with the linear magnetic induction array and comprising a plurality of magnetic control switches arranged in a row along the straight line; a magnet capable of moving along the straight line relative to the linear magnetic induction array and the magnetic control switch array; a position range determination unit, adapted to determine a position range of the magnet in the straight line direction based on the switching states of the plurality of magnetic control switches; a signal acquisition unit, adapted to acquire magnetic field strength signals detected by the magnetic induction sensors located within the position range; and a position calculation unit, adapted to calculate the position of the magnet in the straight line direction based on the acquired magnetic field strength signals.

[0036] Figure 1A schematic diagram showing a displacement measuring device according to an exemplary embodiment of the present invention; Figure 2 show Figure 1 A plan view of the displacement measuring device is shown, wherein the magnet 20 is located at the magnetic switch B3.

[0037] like Figure 1 and Figure 2 As shown, in the illustrated embodiment, the displacement measuring device includes: a linear magnetic induction array A, a magnetically controlled switch array B, a magnet 20, a position range determination unit (not shown), a signal acquisition unit (not shown) and a position calculation unit (not shown).

[0038] like Figure 1 and Figure 2 As shown, in the illustrated embodiment, the linear magnetic induction array A includes a plurality of magnetic induction sensors A1-A13 arranged in a row along a linear direction X. The magnetic control switch array B is arranged side by side with and adjacent to the linear magnetic induction array A. The magnetic control switch array B includes a plurality of magnetic control switches B1-B5 arranged in a row along the linear direction X. The magnet 20 is movable relative to the linear magnetic induction array A and the magnetic control switch array B along the linear direction X. In the illustrated embodiment, the magnet 20 has moved to the magnetic control switch B3.

[0039] like Figure 1 and Figure 2 As shown, in the illustrated embodiment, the position range determination unit is adapted to determine the position range of the magnet 20 in the linear direction X based on the switching states of the plurality of magnetically controlled switches B1 to B5. The signal acquisition unit is adapted to acquire magnetic field strength signals detected by the magnetic induction sensors within the position range. The position calculation unit is adapted to calculate the position of the magnet 20 in the linear direction X based on the acquired magnetic field strength signals. In an exemplary embodiment of the present invention, the position range determination unit, signal acquisition unit, and position calculation unit may be functional modules integrated into a computer or single-chip microcomputer and comprised of software and / or hardware.

[0040] The following will refer to Figure 1 and Figure 2 The principle of the displacement measurement device is described in detail. In the illustrated embodiment, when the magnet 20 is located at the magnetic control switch B3, the magnetic field strength at the magnetic control switches B2 and B4 reaches a predetermined value, causing the switch states of the magnetic control switches B2 and B4 to switch. For example, from the closed state to the open state. The magnetic field strength at the other magnetic control switches B1, B3 and B5 is less than the predetermined value, causing the magnetic control switches B1, B3 and B5 to remain in the closed state. For the sake of intuitiveness, Figure 2In the figure, open magnetic switches B2 and B4 are represented by black blocks, while closed magnetic switches B1, B3, and B5 are represented by white blocks. At this point, based on the switch states of all magnetic switches B1, B2, B3, B4, and B5 in the magnetic switch array B, it can be determined that magnet 20 is located within the position range between magnetic switches B2 and B4. Then, only the magnetic field strength signals detected by magnetic sensors A4-A10 located between magnetic switches B2 and B4 need to be collected. Finally, the position of magnet 20 in the linear direction X can be calculated based on the collected magnetic field strength signals from magnetic sensors A4-A10. Therefore, the present invention eliminates the need to collect, process, and calculate the magnetic field strength signals from all magnetic sensors A1-A13 in the linear magnetic induction array A. This significantly reduces the power consumption of the displacement measurement device and significantly improves the data update frequency and detection efficiency of the displacement measurement device.

[0041] like Figure 1 and Figure 2 As shown, in the illustrated embodiment, the initial state of the magnetic control switches B1-B5 is the closed state. When the magnetic field strength at the magnetic control switches B1-B5 rises above a predetermined value, the magnetic control switches B1-B5 are switched from the closed state to the open state; and when the magnetic field strength at the magnetic control switches B1-B5 falls below the predetermined value, the magnetic control switches B1-B5 are switched from the open state to the closed state.

[0042] However, the present invention is not limited to the illustrated embodiment. For example, in another exemplary embodiment of the present invention, the magnetic control switches B1-B5 are initially in an open state. When the magnetic field strength at the magnetic control switches B1-B5 rises above a predetermined value, the magnetic control switches B1-B5 are switched from the open state to the closed state. Furthermore, when the magnetic field strength at the magnetic control switches B1-B5 falls below the predetermined value, the magnetic control switches B1-B5 are switched from the closed state to the open state.

[0043] Figure 4 show Figure 1 A plan view of the displacement measuring device is shown, wherein the magnet 20 is located at the magnetic switch B1.

[0044] like Figure 4 As shown, in the illustrated embodiment, when the magnet 20 is located at the magnetic control switch B1, the magnetic field strength at the magnetic control switch B2 reaches a predetermined value, causing the switch state of the magnetic control switch B2 to switch. For example, it switches from a closed state to an open state. However, the magnetic field strength at the other magnetic control switches B1, B3, B4, and B5 is less than the predetermined value, causing the magnetic control switches B1, B3, B4, and B5 to remain in a closed state. For the sake of clarity, Figure 4In the figure, the open magnetic switch B2 is represented by a black block, and the closed magnetic switches B1, B3, B4, and B5 are represented by white blocks. At this point, based on the switch states of all magnetic switches B1, B2, B3, B4, and B5 in the magnetic switch array B, it can be determined that the magnet 20 is located within the position range between magnetic switches B1 and B2.

[0045] according to Figure 2 and Figure 4 In the embodiment shown, it can be seen that when the magnet 20 is in different position ranges, the combined switch states formed by the switch states of the multiple magnetic switches B1 to B5 in the magnetic switch array B are different, so that the position range of the magnet 20 can be determined according to the switch states of the multiple magnetic switches B1 to B5. For example, Figure 2 In the embodiment shown, the combined switch state composed of the switch states of the plurality of magnetically controlled switches B1 to B5 is "B1 open, B2 closed, B3 open, B4 closed, B5 open"; and Figure 4 In the illustrated embodiment, the combined switch state formed by the switch states of the plurality of magnetically controlled switches B1 to B5 is “B1 open, B2 closed, B3 open, B4 open, B5 open”.

[0046] like Figure 1-2 and Figure 4 As shown, in the illustrated embodiment, the position of each magnetic control switch B1-B5 in the linear direction X is preset and known; and the position of each magnetic induction sensor A1-A13 in the linear direction X is preset and known.

[0047] like Figure 1-2 and Figure 4 As shown, in the illustrated embodiment, the number of magnetic switches B1-B5 in the magnetic switch array B is less than or equal to the number of magnetic sensors A1-A13 in the linear magnetic induction array A. However, please note that the number of magnetic switches B1-B5 in the magnetic switch array B is primarily determined by the stroke of the magnet 20 and the size, shape, and magnetic parameters of the magnet 20 itself.

[0048] Figure 3 show Figure 1 The plan view of the displacement measuring device is shown, in which the distance D1 between adjacent magnetic induction sensors A1-A13 and the distance D2 between adjacent magnetic control switches B1-B5 are marked.

[0049] like Figure 3 As shown, in the illustrated embodiment, the distance D2 between two adjacent magnetic switches B1-B5 in the magnetic switch array B is greater than or equal to the distance D1 between two adjacent magnetic induction sensors A1-A13 in the linear magnetic induction array A.

[0050] like Figure 3 As shown in the illustrated embodiment, the spacing D2 between two adjacent magnetic switches B1-B5 in magnetic switch array B is an integer multiple of the spacing D1 between two adjacent magnetic sensors A1-A13 in linear magnetic induction array A, for example, 3 times as shown. This facilitates calculations, but the present invention is not limited to the illustrated embodiment. For example, the ratio of the spacing D2 between two adjacent magnetic switches B1-B5 to the spacing D1 between two adjacent magnetic sensors A1-A13 may not be an integer, for example, it may be 1.5, 2.5, or 3.5.

[0051] like Figures 1 to 4 As shown in the illustrated embodiment, each magnetic switch B1-B5 in the magnetic switch array B is aligned with a corresponding magnetic induction sensor A1-A13 in the linear magnetic induction array A. This facilitates calculations. However, the present invention is not limited to the illustrated embodiment. For example, the magnetic switches B1-B5 may be staggered and misaligned with the magnetic induction sensors A1-A13.

[0052] like Figures 1 to 4 As shown, in the illustrated embodiment, the displacement measuring device further includes a circuit board 10, on which the linear magnetic induction array A and the magnetic control switch array B are disposed. The position range determination unit, the signal acquisition unit, and the position calculation unit are electrically connected to the plurality of magnetic induction sensors A1-A13 and the plurality of magnetic control switches B1-B5 via the circuit board 10, respectively.

[0053] Figure 5 show Figure 1 The magnetic field strength signal curve detected by the magnetic induction sensor of the displacement measuring device shown.

[0054] like Figures 1 to 5 As shown, in the illustrated embodiment, the spacing D2 between two adjacent magnetic switches B1-B5 in the magnetic switch array B is not less than half the wavelength λ of the magnetic field strength signal curve detected by the magnetic induction sensors A1-A13 and is less than the wavelength λ of the magnetic field strength signal curve detected by the magnetic induction sensors A1-A13.

[0055] like Figures 1 to 5As shown, in the illustrated embodiment, the wavelength λ of the magnetic field strength signal curve detected by magnetic sensors A1-A13 is primarily determined by factors such as the size, shape, number, and magnetic parameters of the magnet 20 itself. Therefore, the wavelength λ of the magnetic field strength signal curve detected by magnetic sensors A1-A13 can be adjusted by varying the size, shape, number, and magnetic parameters of the magnet 20 itself. To improve detection efficiency, it is desirable to reduce the wavelength λ of the magnetic field strength signal curve detected by magnetic sensors A1-A13. This reduces the spacing D2 between adjacent magnetic switches B1-B5 in magnetic switch array B, thereby reducing the range of the magnet's position. When the range of the magnet's position is smaller, fewer magnetic sensors are required to collect data, further improving detection efficiency.

[0056] Figure 6 A schematic diagram shows a displacement measuring device according to another exemplary embodiment of the present invention.

[0057] and Figure 1-2 Compared to the embodiment shown, Figure 6 The difference of the embodiment shown is that the size of the magnet 20 is changed so that the wavelength λ of the magnetic field intensity signal curve detected by the magnetic induction sensors A1 to A13 becomes smaller. Figure 6 As shown in FIG, the spacing D2 between two adjacent magnetic switches B1 to B5 in the magnetic switch array B becomes approximately twice the spacing D1 between two adjacent magnetic sensors A1 to A13 in the linear magnetic induction array A. At this time, the number of magnetic sensors A5 to A9 that need to collect signals is only 5, and Figure 1-2 In the embodiment shown, the number of magnetic induction sensors A4 to A10 that need to collect signals is 7. Figure 1-2 Compared to the embodiment shown, Figure 6 The embodiment shown has a higher detection efficiency.

[0058] like Figures 1 to 6 As shown, in the illustrated embodiment, the spacing D1 between two adjacent magnetic induction sensors A1-A13 in the linear magnetic induction array A is less than half the wavelength λ of the magnetic field intensity signal curve detected by the magnetic induction sensors A1-A13. For example, the ratio of the spacing D1 between two adjacent magnetic induction sensors A1-A13 in the linear magnetic induction array A to the wavelength λ of the magnetic field intensity signal curve detected by the magnetic induction sensors A1-A13 can be within the range of 0.01 to 0.4. Please note that the smaller the spacing D1 between two adjacent magnetic induction sensors A1-A13 in the linear magnetic induction array A, the higher the detection accuracy, but the lower the detection efficiency. Therefore, it is necessary to reasonably set the spacing D1 between two adjacent magnetic induction sensors A1-A13 in the linear magnetic induction array A.

[0059] In an exemplary embodiment of the present invention, the magnetic induction sensors A1 to A13 are magnetoresistive sensors, but the present invention is not limited thereto, and the magnetic induction sensors A1 to A13 may also be Hall sensors or other suitable sensors.

[0060] In another exemplary embodiment of the present invention, a displacement measurement method is also disclosed, comprising the following steps:

[0061] S100: providing the aforementioned displacement measuring device;

[0062] S200: moving the magnet 20 along the linear direction X;

[0063] S300: Determine the position range of the magnet 20 in the linear direction X according to the switch states of the plurality of magnetic control switches B1 to B5;

[0064] S400: collecting magnetic field strength signals detected by magnetic induction sensors within the position range;

[0065] S500: Calculate the position of the magnet 20 in the linear direction X according to the collected magnetic field strength signal.

[0066] Those skilled in the art will understand that the embodiments described above are exemplary and can be improved by those skilled in the art. The structures described in various embodiments can be freely combined without causing any conflicts in structure or principle. These changes should fall within the scope of protection of the present invention.

[0067] Although the present invention has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplify the preferred embodiments of the present invention and should not be construed as limiting the present invention.

[0068] Although some embodiments of the general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.

[0069] It should be noted that the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. In addition, any element reference in the claims should not be construed as limiting the scope of the invention.

Claims

1. A displacement measuring device, characterized in that: include: A linear magnetic induction array (A) includes a plurality of magnetic induction sensors (A1 to A13) arranged in a row along a straight line direction (X); a magnetic control switch array (B), arranged side by side with the linear magnetic induction array (A), and comprising a plurality of magnetic control switches (B1 to B5) arranged in a row along the straight line direction (X); A magnet (20) capable of moving along the linear direction (X) relative to the linear magnetic induction array (A) and the magnetic control switch array (B); a position range determining unit adapted to determine the position range of the magnet (20) in the linear direction (X) according to the switching states of the plurality of magnetically controlled switches (B1-B5); a signal acquisition unit adapted to acquire magnetic field strength signals detected by the magnetic induction sensor within the position range; and A position calculation unit is adapted to calculate the position of the magnet (20) in the linear direction (X) based on the collected magnetic field strength signal.

2. The displacement measuring device according to claim 1, characterized in that: When the magnetic field intensity at the magnetic control switches (B1-B5) rises above a predetermined value, the magnetic control switches (B1-B5) are switched from a closed state to an open state; and When the magnetic field intensity at the magnetic control switches (B1-B5) drops below the predetermined value, the magnetic control switches (B1-B5) are switched from the open state to the closed state.

3. The displacement measuring device according to claim 1, wherein: When the magnetic field intensity at the magnetic control switches (B1-B5) rises above a predetermined value, the magnetic control switches (B1-B5) are switched from an open state to a closed state; and When the magnetic field intensity at the magnetic control switches (B1-B5) drops below the predetermined value, the magnetic control switches (B1-B5) are switched from the closed state to the open state.

4. The displacement measuring device according to claim 1, wherein: When the magnet (20) is in different position ranges, the combined switch states formed by the switch states of the multiple magnetic control switches (B1-B5) are different, so that the position range of the magnet (20) can be determined according to the switch states of the multiple magnetic control switches (B1-B5).

5. The displacement measuring device according to claim 1, wherein: The position of each magnetically controlled switch (B1-B5) in the linear direction (X) is preset and known; and The position of each magnetic induction sensor (A1-A13) in the linear direction (X) is preset and known.

6. The displacement measuring device according to claim 1, characterized in that: The number of magnetic switches (B1-B5) in the magnetic switch array (B) is less than or equal to the number of magnetic induction sensors (A1-A13) in the linear magnetic induction array (A).

7. The displacement measuring device according to claim 1, characterized in that: The spacing (D2) between two adjacent magnetic switches (B1-B5) in the magnetic switch array (B) is greater than or equal to the spacing (D1) between two adjacent magnetic induction sensors (A1-A13) in the linear magnetic induction array (A).

8. The displacement measuring device according to claim 1, characterized in that: The spacing (D2) between two adjacent magnetic switches (B1-B5) in the magnetic switch array (B) is an integer multiple of the spacing (D1) between two adjacent magnetic induction sensors (A1-A13) in the linear magnetic induction array (A).

9. The displacement measuring device according to claim 1, characterized in that: Each magnetic control switch (B1-B5) in the magnetic control switch array (B) is aligned with a corresponding magnetic induction sensor (A1-A13) in the linear magnetic induction array (A).

10. The displacement measuring device according to claim 1, characterized in that: The displacement measuring device further comprises a circuit board (10), and the linear magnetic induction array (A) and the magnetic control switch array (B) are arranged on the circuit board (10); The position range determination unit, the signal acquisition unit and the position calculation unit are electrically connected to the plurality of magnetic induction sensors (A1 to A13) and the plurality of magnetic control switches (B1 to B5) via the circuit board (10), respectively.

11. The displacement measuring device according to any one of claims 1 to 10, characterized in that: The spacing (D2) between two adjacent magnetic switches (B1-B5) in the magnetic switch array (B) is not less than half the wavelength (λ) of the magnetic field intensity signal curve detected by the magnetic induction sensors (A1-A13) and is less than the wavelength (λ) of the magnetic field intensity signal curve detected by the magnetic induction sensors (A1-A13).

12. The displacement measuring device according to any one of claims 1 to 10, characterized in that: The distance (D1) between two adjacent magnetic induction sensors (A1-A13) in the linear magnetic induction array (A) is less than half the wavelength (λ) of the magnetic field intensity signal curve detected by the magnetic induction sensors (A1-A13).

13. The displacement measuring device according to claim 12, characterized in that: The ratio of the distance (D1) between two adjacent magnetic induction sensors (A1-A13) in the linear magnetic induction array (A) to the wavelength (λ) of the magnetic field intensity signal curve detected by the magnetic induction sensors (A1-A13) is within the range of 0.01-0.

4.

14. The displacement measuring device according to claim 1, wherein: The magnetic induction sensors (A1-A13) are magnetoresistive sensors or Hall sensors.

15. A displacement measurement method, characterized in that: The following steps are involved: S100: Providing a displacement measuring device according to any one of claims 1 to 13; S200: moving the magnet (20) along a straight line direction (X); S300: determining the position range of the magnet (20) in the linear direction (X) according to the switching states of a plurality of magnetically controlled switches (B1-B5); S400: collecting magnetic field strength signals detected by the magnetic induction sensor within the position range; S5 00: Calculating the position of the magnet (20) in the linear direction (X) based on the collected magnetic field strength signal.

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