Acceleration detection method and device, electronic equipment and storage medium

Abstract

The invention relates to an acceleration detection method and device, electronic equipment and a storage medium, and belongs to the technical field of optical fiber sensing, and the method comprises the steps: determining the detection sensitivity of a plurality of grating sensor pairs in an optical fiber accelerometer disposed on a to-be-detected object; a detection optical fiber in the optical fiber accelerometer comprises a sensing optical fiber section, at least three grating sensors are arranged on the sensing optical fiber section, and the at least three grating sensors form a plurality of grating sensor pairs; when a vibration signal reflected by the sensing optical fiber section is received, target detection sensitivity is determined; and determining the acceleration of the to-be-detected object according to the target detection sensitivity and the optical signal phase demodulation result of the target grating sensor pair corresponding to the target detection sensitivity. According to the invention, on the premise of not changing core structure parameters of the optical fiber accelerometer, dynamic selection of the detection sensitivity is realized, so that the acceleration detection range is expanded.

Description

Technical Field

[0001] This invention relates to the field of fiber optic sensing technology, and in particular to an acceleration detection method, device, electronic device, and storage medium. Background Technology

[0002] Fiber optic sensing technology, as a modern sensing method, has played an irreplaceable role in key fields such as aerospace, equipment fault diagnosis, underwater acoustic detection, oil and gas exploration, and seismic monitoring due to its unique performance advantages. Among them, fiber optic accelerometers, as an important branch of this technology, exhibit superior electromagnetic interference resistance and excellent environmental adaptability compared to traditional electromechanical accelerometers, enabling stable operation under harsh conditions such as strong electromagnetic fields, high pressure, high temperature, corrosion, and radiation. Furthermore, thanks to the inherent low transmission loss and high bandwidth characteristics of optical fibers, the sensing information acquired by fiber optic accelerometers can be transmitted stably over long distances with low distortion, providing an ideal solution for the construction of large-scale distributed monitoring networks.

[0003] Among various types of fiber optic accelerometers, interferometric fiber optic accelerometers (IFOAs) are favored due to their large dynamic range, high sensitivity, and stable and reliable output characteristics. IFOAs typically measure physical quantities by detecting the phase change of the interferometric optical signal caused by external acceleration. In particular, phase-sensitive optical time-domain reflectometers (IFOAs) are used... φ The fiber optic accelerometer configured with an OTDR (Optical Time-to-Density Detector) can achieve dense sensing and localization of vibration signals using a single optical fiber, demonstrating an absolute advantage in application scenarios that require large-area coverage or long-distance linear deployment.

[0004] To demodulate the phase response signal, sensing systems typically require reflection points at both ends of the optical fiber, such as utilizing the Rayleigh scattering effect or incorporating devices like Faraday rotators. Unlike these methods, low-reflection grating arrays embedded within the optical fiber eliminate the need for additional discrete optical components, offering significant advantages such as structural stability, low manufacturing cost, and compact size. This characteristic makes low-reflection grating technology particularly suitable for constructing high-capacity, high-density fiber optic accelerometer sensor arrays, thereby meeting the demands of future IoT sensing networks for massive numbers of sensor nodes.

[0005] Accelerometer dynamic range is one of the core performance indicators for fiber optic accelerometers. For phase-sensitive fiber optic accelerometers, the dynamic range is closely related to the capability of the phase dewinding algorithm, the noise floor of the demodulation system, and the sensitivity of the sensor itself.

[0006] While existing research has attempted to improve the detection performance of fiber optic accelerometers by adjusting their sensitivity through modifications to mechanical structural parameters (such as mass block mass and elastic element stiffness), these methods have inherent drawbacks. Such adjustments inevitably alter the sensor's stiffness and resonant frequency, thus affecting its frequency response characteristics. For specific applications, fiber optic accelerometers need to operate within a predetermined frequency response range; frequency drift is an undesirable negative effect, and maintaining its stability is crucial for ensuring the accuracy and reliability of measurement results. Furthermore, these adjustments involving the fiber optic accelerometer's structure not only affect its detection stability and long-term reliability but also make flexible and reversible adjustments difficult to implement after actual deployment, limiting the accelerometer's adaptability and application flexibility.

[0007] Therefore, there is an urgent need in this field for a new technology that can flexibly adjust the sensitivity while keeping the sensor's resonant frequency and core structural parameters basically unchanged, so as to break through the existing optimization bottleneck of dynamic range and broaden the application scenarios of fiber optic accelerometers. Summary of the Invention

[0008] In view of this, it is necessary to provide an acceleration detection method, device, electronic device and storage medium to solve the problem that existing acceleration detection methods cannot achieve flexible sensitivity adjustment while ensuring detection stability.

[0009] To address the aforementioned problems, in a first aspect, the present invention provides an acceleration detection method, comprising: Multiple grating sensor pairs in a fiber optic accelerometer set on the object to be detected are identified, and the detection sensitivity of each grating sensor pair is determined according to the fiber length between each grating sensor pair; wherein, the detection fiber in the fiber optic accelerometer includes a sensing fiber segment, and at least three grating sensors are set on the sensing fiber segment, and the at least three grating sensors constitute the multiple grating sensor pairs; When the vibration signal reflected back from the sensing fiber segment is received, the target detection sensitivity is determined; The acceleration of the object to be detected is determined based on the target detection sensitivity and the optical signal phase demodulation result of the target grating sensor pair corresponding to the target detection sensitivity.

[0010] In one possible implementation, determining the target detection sensitivity includes: The target detection sensitivity is determined based on the intensity of the vibration signal.

[0011] In one possible implementation, determining the target detection sensitivity includes: According to the order of detection sensitivity from large to small, the optical signal phases of the grating sensor pairs corresponding to the detection sensitivity are demodulated sequentially until the demodulated optical signal phase is the unwinding phase. The detection sensitivity corresponding to the unwinding phase is determined as the target detection sensitivity.

[0012] In one possible implementation, the optical signal phase demodulation result includes a phase difference; determining the acceleration of the object to be detected based on the target detection sensitivity and the optical signal phase demodulation result of the target grating sensor pair corresponding to the target detection sensitivity includes: The acceleration of the object to be detected is obtained by comparing the phase difference with the target detection sensitivity.

[0013] In one possible implementation, the detection fiber further includes a transmission fiber segment, which is alternately connected to the sensing fiber segment, wherein the fiber length between any pair of grating sensors is greater than the length of the transmission fiber segment.

[0014] In one possible implementation, the detection fiber further includes a transmission fiber segment, which is alternately connected to the sensing fiber segment. The minimum fiber length between each pair of grating sensors is less than the length of the transmission fiber segment, and the pulse width of the emitted optical signal in the detection fiber is determined based on the minimum value.

[0015] In one possible implementation, the reflectivity of the grating sensor is less than or equal to -50 dB.

[0016] Secondly, the present invention also provides an acceleration detection device, comprising: A detection sensitivity determination module is used to determine multiple grating sensor pairs in a fiber optic accelerometer set on the object to be detected, and to determine the detection sensitivity of the grating sensor pair based on the fiber length between each grating sensor pair; wherein, the detection fiber in the fiber optic accelerometer includes a sensing fiber segment, and at least three grating sensors are set on the sensing fiber segment, and the at least three grating sensors constitute the multiple grating sensor pairs. The detection module is used to determine the target detection sensitivity when it receives the vibration signal reflected back from the sensing fiber segment; An acceleration determination module is used to determine the acceleration of the object to be detected based on the target detection sensitivity and the optical signal phase demodulation result of the target grating sensor pair corresponding to the target detection sensitivity.

[0017] Thirdly, the present invention also provides an electronic device, including a memory and a processor, wherein the memory is used to store a program; the processor is coupled to the memory and is used to execute the program stored in the memory to implement the steps in the acceleration detection method described in any of the above claims.

[0018] Fourthly, the present invention also provides a computer-readable storage medium for storing a computer-readable program, wherein the program or instructions, when executed by a processor, can implement the steps in any of the above-described acceleration detection methods.

[0019] The beneficial effects of this invention are: This invention adds grating sensors to the sensing fiber segment of a fiber optic accelerometer to form multiple grating sensor pairs. Different grating sensor pairs have different detection sensitivities, and different detection sensitivities can detect vibration signals of varying intensities. Therefore, when using the fiber optic accelerometer for acceleration detection, an appropriate detection sensitivity can be selected as the target detection sensitivity based on the vibration signal reflected back from the sensing fiber segment. Based on the target detection sensitivity and the phase demodulation result of the optical signal from the corresponding target grating sensor pair, the acceleration of the object to be detected can be determined. This invention allows for dynamic sensitivity selection, enabling more flexible detection of vibration signals over a wider range. Furthermore, the changes to the fiber optic accelerometer structure do not affect its resonant frequency, ensuring the frequency detection range of the fiber optic accelerometer and thus guaranteeing the stability and reliability of the acceleration detection results based on the fiber optic accelerometer. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic flowchart of an embodiment of the acceleration detection method provided by the present invention; Figure 2 A structural diagram of the detection fiber in an optical fiber accelerometer provided by the present invention; Figure 3 For the present invention Figure 1 A flowchart illustrating an embodiment of S103; Figure 4 This is a schematic diagram of the structure of an embodiment of the acceleration detection device provided by the present invention; Figure 5 A schematic diagram of an embodiment of the electronic device provided by the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] In the description of the embodiments of this invention, unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," etc., used in the embodiments of this invention are used to distinguish similar objects, and are not used to describe a specific order or sequence, nor to indicate or imply their relative importance or implicitly specify the number of indicated technical features. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, and the number of objects is not limited; for example, a first object can be one or more.

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] Reference Figure 1 The diagram illustrates a flowchart of an embodiment of the acceleration detection method provided by the present invention, the method comprising: S101, determine multiple grating sensor pairs in the fiber optic accelerometer set on the object to be detected, and determine the detection sensitivity of the grating sensor pair according to the fiber length between each grating sensor pair; wherein, the detection fiber in the fiber optic accelerometer includes a sensing fiber segment, and at least three grating sensors are set on the sensing fiber segment, and the at least three grating sensors form multiple grating sensor pairs.

[0026] The detection sensitivity of a grating sensor pair can be calculated using the theoretical formula for sensitivity calculation combined with the fiber length between the grating sensor pairs. A shorter fiber length between the grating sensor pairs results in lower detection sensitivity, allowing the detection of stronger vibration signals; conversely, a longer fiber length results in higher detection sensitivity, allowing the detection of weaker vibration signals.

[0027] Reference Figure 2This diagram illustrates the structure of the detection fiber in a fiber optic accelerometer provided by the present invention. The detection fiber includes a low-reflection grating (10), a transmission fiber segment (20) of length L1, a sensing fiber segment (30) of length L2, and an additional low-reflection grating (40) dividing the sensing fiber segment (30) into sensing fiber segment 1 (50) of length L3 and sensing fiber segment 2 (60) of length L4. The sensing fiber segment (30) includes three grating sensors, which can form three sets of grating sensor pairs. The sensitivity of the fiber optic accelerometer can be expressed as: (1) In the formula, Δ φ , a These are the phase change and acceleration amplitude, respectively. n , L The refractive index and length of the corresponding sensing fiber segment, λ Let Δ be the wavelength of the incident light. L Δ n These represent the changes in fiber length and refractive index caused by the disturbance signal, respectively. The change in refractive index in the medium caused by the photoelastic effect is: (2) In the formula, P 11 and P 12 It is the photoelastic coefficient of the optical fiber. ν This represents the Poisson's ratio of the optical fiber. The lengths of the transmission fiber segment and the sensing fiber segment are denoted as _____. L 1 and L 2. The relationship between the sensitivity of a fiber optic accelerometer and axial strain can be written as: (3) This sensitivity is the sensitivity of the sensing fiber segment (30). The lengths of sensing fiber segment 1 (50) and sensing fiber segment 2 (60) are respectively denoted as... L 3 and L 4. Therefore, the sensitivity obtained by demodulating sensing fiber segment 1 (50) and sensing fiber segment 2 (60) can be expressed as: (4) S102, when the vibration signal reflected back from the sensing fiber segment is received, the target detection sensitivity is determined.

[0028] The target detection sensitivity can be determined based on the intensity of the vibration signal or the demodulation effect of the vibration signal.

[0029] S103, based on the target detection sensitivity and the optical signal phase demodulation result of the target grating sensor pair corresponding to the target detection sensitivity, determine the acceleration of the object to be detected.

[0030] The sensing fiber segment is typically mounted on a vibration pickup structure. Under acceleration, the vibration pickup device causes the sensing fiber segment to deform, resulting in a change in the phase difference between the gratings at both ends of the sensing fiber segment. By comparing this phase difference with the target detection sensitivity, the acceleration of the object to be detected can be obtained. The calculation formula is as follows: (5) In the formula, a For acceleration, S To detect sensitivity, This represents the phase difference.

[0031] The acceleration detection method provided in this embodiment can be applied to an acceleration detection system, which can be a software system running on a terminal device. The terminal device can be a tablet computer, in-vehicle device, augmented reality (AR) / virtual reality (VR) device, laptop computer, ultra-mobile personal computer (UMPC), netbook, personal digital assistant (PDA), mobile phone, etc. This embodiment does not impose any restrictions on the specific type of terminal device.

[0032] In summary, the present invention has the following beneficial effects: 1. In this embodiment, only a grating sensor is added to the original sensing fiber segment without changing the length or structural parameters of the original sensing fiber segment. Therefore, it will not affect the original sensitivity of the sensing fiber segment. Furthermore, it will not affect the size of the fiber optic accelerometer, which is beneficial for miniaturization and weight reduction, thus lowering costs and manufacturing difficulty.

[0033] 2. Only the location of the additional grating needs to be determined in the initial design phase of the fiber optic accelerometer, i.e., the segmentation method of the sensing fiber needs to be determined. Therefore, during actual detection, sensitivity adjustment does not require additional operations on the fiber optic accelerometer. Only the appropriate grating sensor pair needs to be selected during demodulation, making the operation simple and convenient.

[0034] 3. When demodulating vibration signals, the detection sensitivity can be dynamically selected to improve the detection range and detection effect. Specifically, phase wrapping is prone to occur when dealing with large-amplitude vibration signals, which limits the effective detection of strong vibrations. This embodiment can achieve flexible adjustment of sensitivity, enhancing the ability to capture large-amplitude signals by reducing sensitivity.

[0035] 4. Since the overall length of the sensing fiber segment in the fiber optic accelerometer remains unchanged, the resonant frequency of the fiber optic accelerometer will not be affected, thus ensuring the frequency detection range of the fiber optic accelerometer, and consequently ensuring the frequency response characteristics, detection stability, and reliability of the fiber optic accelerometer.

[0036] In some embodiments of the present invention, the dynamic range that the fiber optic accelerometer can detect can be determined based on the detection sensitivity of multiple grating sensor pairs, and the dynamic range is expressed as: (6) In the formula, a max , a min These are the maximum and minimum accelerations that the fiber optic accelerometer can measure, respectively. φ max , φ min These are the maximum and minimum measurable phases, respectively. S This refers to the sensitivity of the fiber optic accelerometer. The dynamic range of the fiber optic accelerometer can be described as: (7) In the formula, S max , S min These are the maximum and minimum sensitivities of the fiber optic accelerometer, respectively. S max This refers to the sensitivity of the entire sensing fiber segment. S min This represents the minimum sensitivity corresponding to the segmentation of the sensing fiber. In this embodiment, the dynamic range is improved by adjusting the sensitivity of the fiber optic accelerometer. The magnitude of the improvement is mainly related to the division of the sensing fiber length, as expressed as: (8) In some embodiments of the present invention, multiple grating sensor pairs can be obtained by combining at least three grating sensors in pairs on a sensing fiber segment. If the sensing fiber segment is divided into... x Segments, then coexist x With +1 grating sensor, demodulation can be achieved by any one of the grating sensor pairs. x ( xWith +1) / 2 demodulation methods, the accelerometer can be considered to exhibit an equal number of sensitivities, allowing for a large adjustment range in sensitivity. If the required vibration amplitude is extremely large, a pair of closely spaced grating sensors can be reserved, significantly reducing the fiber optic accelerometer's sensitivity and thus expanding its ability to detect large-amplitude signals. The number of additional grating sensors can be adjusted according to actual needs; an increased number of grating sensors means more selectable sensitivity levels. Furthermore, the segmentation of the sensing fiber segment does not affect the overall sensitivity of the fiber optic accelerometer, ensuring accurate detection of weak signals.

[0037] In some embodiments of the present invention, the step of determining the target detection sensitivity may include: The target detection sensitivity is determined based on the intensity of the vibration signal.

[0038] Specifically, the range of vibration signal intensity that each grating sensor can detect can be predefined, that is, a mapping relationship between the grating sensor and the vibration signal intensity range can be established, and then the target detection sensitivity can be determined according to this mapping relationship during actual use.

[0039] In some embodiments of the present invention, such as Figure 3 As shown, the steps for determining target detection sensitivity may include: S301, in descending order of detection sensitivity, demodulate the optical signal phase of the grating sensor pair corresponding to the detection sensitivity until the demodulated optical signal phase is the unwinding phase.

[0040] S302, determine the detection sensitivity corresponding to the unwinding phase as the target detection sensitivity.

[0041] For details, please refer to... Figure 2 First, the grating sensors at both ends of the sensing fiber segment (30) can be demodulated. If the signal cannot be demodulated normally and the phase is tangled, the detection sensitivity can be reduced to the relatively higher one between L3 and L4. If the tangling phenomenon still occurs, the detection sensitivity can be further reduced to the lowest one between L3 and L4. If the sensing fiber segment (30) is divided into more than just the L3 and L4 ends, there are more options for reducing the sensitivity.

[0042] This embodiment reduces the detection sensitivity from high to low. Firstly, it reduces the sensitivity to meet the detection requirements. Secondly, under the premise of normal demodulation, a higher detection sensitivity can result in more accurate detection results.

[0043] In some embodiments of the present invention, the detection optical fiber further includes a transmission optical fiber segment, which is alternately connected with the sensing optical fiber segment, and the optical fiber length between any pair of grating sensor pairs is greater than the length of the transmission optical fiber segment.

[0044] The length of the sensing fiber segment is usually greater than that of the transmission fiber segment. A common standard for this is to ensure that the fiber length between any pair of grating sensors is not less than the transmission fiber segment. This ensures that the requirement for the pulse width of the transmitted optical signal is not increased. Since the position of each grating needs to be correctly acquired, the pulse width is crucial.

[0045] In special cases, such as when a lower detection sensitivity is required, the above classification criteria may not be followed, but the pulse width needs to be adjusted accordingly. The pulse width is determined based on the minimum fiber length between each pair of grating sensors, so as to ensure that the position of each grating sensor is accurately identified.

[0046] The specific division of the sensing fiber segment can be selected according to the specific circumstances.

[0047] In some embodiments of the present invention, the grating sensor may be a low-reflection grating, that is, a grating with a reflectivity of less than or equal to -50 dB.

[0048] In some embodiments of the present invention, the grating accelerometer can be a disk type, which further includes an elastic diaphragm, and the detection fiber is wound to form a multi-turn fiber loop, the fiber loop being disposed on the elastic diaphragm. The detection sensitivity of the sensing fiber segment is also related to its position on the detection fiber. Specifically, the length change per unit length of the sensing fiber segment wound on the outer side of the elastic diaphragm is smaller than that of the inner region. For sensing fiber segment 1 (50) and sensing fiber segment 2 (60) in sensing fiber segment (30), if sensing fiber segment 2 (60) is located on the outer side of the elastic diaphragm, the improvement in the dynamic range of the fiber optic accelerometer can be expressed as: (9) Considering that the change in unit length of the outer sensing fiber segment is smaller than that of the inner region, it can be understood that the improvement in dynamic range is not less than L2 / L4.

[0049] For a fiber optic disk accelerometer, the overall stiffness of the structure is mainly composed of the additional stiffness introduced by the elastic diaphragm and the sensing fiber segment, expressed as: (10) In the formula, K d , K f These represent the stiffness of the elastic diaphragm and the sensing fiber segment, respectively. As a thin-plate structure, the bending stiffness of the elastic diaphragm can be expressed as: (11) In the formula, E d and v d These represent Young's modulus and Poisson's ratio of the diaphragm material, respectively. h d The thickness of the elastic diaphragm.

[0050] In this invention, the sensitivity adjustment of the fiber optic accelerometer only involves the selection of the grating sensor pair during demodulation. This means the actual length of the sensing fiber segment remains constant, implying that the stiffness level of the structure does not change. The resonant frequency of the fiber optic accelerometer is mainly related to the stiffness level and inertial mass, expressed as: (12) In the formula, K , m These represent the system's stiffness level and inertial mass, respectively. Therefore, it can be seen that the sensitivity switching operation of this invention does not change the resonant frequency of the fiber optic accelerometer, thus ensuring the frequency detection range of the fiber optic accelerometer. In previously reported solutions, sensor sensitivity adjustment is often achieved by changing the system's stiffness level or inertial mass, which may involve changing the length of the sensing fiber. Sensors are designed for specific detection environments, meaning we need to ensure that the sensor can detect vibration signals within a certain frequency range. However, in previously reported sensitivity adjustment schemes, the sensor's resonant frequency is affected, potentially leading to an insufficient frequency detection range. This invention ensures that the frequency detection range of the fiber optic accelerometer remains unaffected. Furthermore, since the sensitivity switching process only involves selecting the position of the grating sensor and does not require structural adjustments to the sensor itself, it ensures the stability of the fiber optic accelerometer's operation and the reliability of the vibration monitoring process, offering significant advantages.

[0051] Reference Figure 4 The diagram shows a structural schematic of an embodiment of the acceleration detection device provided by the present invention. The device 400 includes: The detection sensitivity determination module 401 is used to determine multiple grating sensor pairs in the fiber optic accelerometer set on the object to be detected, and to determine the detection sensitivity of the grating sensor pair according to the fiber length between each grating sensor pair; wherein, the detection fiber in the fiber optic accelerometer includes a sensing fiber segment, and at least three grating sensors are set on the sensing fiber segment, and at least three grating sensors form multiple grating sensor pairs. The detection module 402 is used to determine the target detection sensitivity when it receives the vibration signal reflected back from the sensing fiber segment; The acceleration determination module 403 is used to determine the acceleration of the object to be detected based on the target detection sensitivity and the phase demodulation result of the optical signal of the target grating sensor pair corresponding to the target detection sensitivity.

[0052] It should be noted that the implementation principles or processes of the above modules can be referred to the aforementioned implementation examples of the acceleration detection method, and will not be elaborated here.

[0053] Reference Figure 5 The present invention illustrates an electronic device 500. The electronic device 500 includes a processor 501, a memory 502, and a display 503. Figure 5 Only some components of the electronic device 500 are shown, but it should be understood that it is not required to implement all the components shown, and more or fewer components may be implemented instead.

[0054] In some embodiments, processor 501 may be a central processing unit (CPU), microprocessor, or other data processing chip, used to run program code stored in memory 502 or process data, such as the acceleration detection method of the present invention.

[0055] In some embodiments, processor 501 may be a single server or a group of servers. The server group may be centralized or distributed. In some embodiments, processor 501 may be local or remote. In some embodiments, processor 501 may be implemented on a cloud platform. In one embodiment, the cloud platform may include a private cloud, public cloud, hybrid cloud, community cloud, distributed cloud, internal cloud, multi-cloud, etc., or any combination thereof.

[0056] In some embodiments, memory 502 may be an internal storage unit of electronic device 500, such as a hard disk or memory of electronic device 500. In other embodiments, memory 502 may also be an external storage device of electronic device 500, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. equipped on electronic device 500.

[0057] Furthermore, the memory 502 may include both internal storage units of the electronic device 500 and external storage devices. The memory 502 is used to store application software and various types of data installed on the electronic device 500.

[0058] In some embodiments, display 503 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. Display 503 is used to display information from electronic device 500 and to display a visual user interface. Components 501-503 of electronic device 500 communicate with each other via a system bus.

[0059] In one embodiment, when processor 501 executes the acceleration detection program in memory 502, the following steps can be implemented: Multiple grating sensor pairs are identified in the fiber optic accelerometer set on the object to be detected, and the detection sensitivity of the grating sensor pair is determined according to the fiber length between each grating sensor pair; wherein, the detection fiber in the fiber optic accelerometer includes a sensing fiber segment, and at least three grating sensors are set on the sensing fiber segment, and at least three grating sensors form multiple grating sensor pairs. When the vibration signal reflected back from the sensing fiber segment is received, the target detection sensitivity is determined; The acceleration of the object to be detected is determined based on the target detection sensitivity and the phase demodulation result of the optical signal of the target grating sensor pair corresponding to the target detection sensitivity.

[0060] It should be understood that when the processor 501 executes the acceleration detection program in the memory 502, in addition to the functions mentioned above, it can also perform other functions, as detailed in the description of the corresponding method embodiments above.

[0061] Furthermore, this embodiment of the invention does not specifically limit the type of electronic device 500 mentioned. Electronic device 500 can be a mobile phone, tablet computer, personal digital assistant (PDA), wearable device, laptop computer, or other portable electronic device. Exemplary embodiments of portable electronic devices include, but are not limited to, portable electronic devices running iOS, Android, Microsoft, or other operating systems. The aforementioned portable electronic device can also be other portable electronic devices, such as a laptop computer with a touch-sensitive surface (e.g., a touch panel). It should also be understood that in some other embodiments of the invention, electronic device 500 may not be a portable electronic device, but rather a desktop computer with a touch-sensitive surface (e.g., a touch panel).

[0062] In one embodiment, the present invention also provides a computer-readable storage medium storing a computer program that, when executed by the processor, implements the steps of any of the acceleration detection methods described above.

[0063] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0064] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An acceleration detection method, characterized in that, include: Multiple grating sensor pairs in a fiber optic accelerometer set on the object to be detected are identified, and the detection sensitivity of each grating sensor pair is determined according to the fiber length between each grating sensor pair; wherein, the detection fiber in the fiber optic accelerometer includes a sensing fiber segment, and at least three grating sensors are set on the sensing fiber segment, and the at least three grating sensors constitute the multiple grating sensor pairs; When the vibration signal reflected back from the sensing fiber segment is received, the target detection sensitivity is determined; The acceleration of the object to be detected is determined based on the target detection sensitivity and the optical signal phase demodulation result of the target grating sensor pair corresponding to the target detection sensitivity.

2. The acceleration detection method according to claim 1, characterized in that, Determining the target detection sensitivity includes: The target detection sensitivity is determined based on the intensity of the vibration signal.

3. The acceleration detection method according to claim 1, characterized in that, Determining the target detection sensitivity includes: According to the order of detection sensitivity from large to small, the optical signal phases of the grating sensor pairs corresponding to the detection sensitivity are demodulated sequentially until the demodulated optical signal phase is the unwinding phase. The detection sensitivity corresponding to the unwinding phase is determined as the target detection sensitivity.

4. The acceleration detection method according to claim 1, characterized in that, The optical signal phase demodulation result includes a phase difference; determining the acceleration of the object to be detected based on the target detection sensitivity and the optical signal phase demodulation result of the target grating sensor pair corresponding to the target detection sensitivity includes: The acceleration of the object to be detected is obtained by comparing the phase difference with the target detection sensitivity.

5. The acceleration detection method according to claim 1, characterized in that, The detection optical fiber also includes a transmission optical fiber segment, which is alternately connected to the sensing optical fiber segment, and the optical fiber length between any pair of grating sensors is greater than the length of the transmission optical fiber segment.

6. The acceleration detection method according to claim 1, characterized in that, The detection optical fiber also includes a transmission optical fiber segment, which is alternately connected to the sensing optical fiber segment. The minimum optical fiber length between each pair of grating sensors is less than the length of the transmission optical fiber segment, and the pulse width of the emitted optical signal in the detection optical fiber is determined according to the minimum value.

7. The acceleration detection method according to claim 1, characterized in that, The reflectivity of the grating sensor is less than or equal to -50 dB.

8. An acceleration detection device, characterized in that, include: A detection sensitivity determination module is used to determine multiple grating sensor pairs in a fiber optic accelerometer set on the object to be detected, and to determine the detection sensitivity of the grating sensor pair based on the fiber length between each grating sensor pair; wherein, the detection fiber in the fiber optic accelerometer includes a sensing fiber segment, and at least three grating sensors are set on the sensing fiber segment, and the at least three grating sensors constitute the multiple grating sensor pairs. The detection module is used to determine the target detection sensitivity when it receives the vibration signal reflected back from the sensing fiber segment; An acceleration determination module is used to determine the acceleration of the object to be detected based on the target detection sensitivity and the optical signal phase demodulation result of the target grating sensor pair corresponding to the target detection sensitivity.

9. An electronic device, characterized in that, Including memory and processor, among which, The memory is used to store programs; The processor, coupled to the memory, is used to execute the program stored in the memory to implement the steps in the acceleration detection method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, Used to store computer-readable programs or instructions, which, when executed by a processor, can implement the steps of an acceleration detection method according to any one of claims 1 to 7.

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