Wireless sensor data acquisition system for electromagnetic shielding scene

Abstract

The invention discloses a wireless sensor data acquisition system for an electromagnetic shielding scene. The wireless sensor data acquisition system comprises an industrial personal computer, a wireless instruction transceiving unit, a wireless signal relay unit and a data acquisition unit. An instruction link and a data link are established in a ZigBee mode and a Wi-Fi mode respectively, operation of the data link of the system is controlled by the instruction link, and therefore system nodes have high data transmission bandwidth under the condition that low power consumption is kept; a system instruction link is constructed by connecting two stages of ZigBee star networks in series through hardware, stable communication of acquisition nodes in an object which is relatively closed and has an electromagnetic shielding effect can be realized, and the application scene of a wireless sensor network is widened. The control operation of the whole system is completed through matched upper computer software, and the software mainly provides the state of each unit of the current system for an operator and provides automatic processing operation, so that the operation is simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless sensors, and in particular, to a wireless sensor data acquisition system for electromagnetic shielding scenarios. Background Art

[0002] As a new information acquisition and transmission technology, the Wireless Sensor Network (WSN) has shown great potential in the fields of environmental monitoring, smart agriculture, smart home, industrial automation, etc. It usually consists of a large number of nodes arranged in the target area, forming a multi-hop self-organizing network with common short-range wireless communication technologies, such as ZigBee, Lora, NB-IoT, Bluetooth, Wi-Fi, etc. Each node usually has one or more different types of sensors, and collaboratively collects various data in the target area and sends it to the information processing center.

[0003] Under the conventional application scenarios of the above wireless sensor network, the nodes in the network need to be placed in an environment with good signal and weak surrounding electromagnetic interference to ensure the stability of communication between each acquisition node and the information processing center. At the same time, the conventional wireless sensor network nodes and the information processing center generally use wireless communication technologies to form a network, and the general wireless method cannot balance power consumption and bandwidth. Considering the power consumption requirements of the nodes, currently, for wireless sensor network nodes, their data transmission bandwidth is generally small, and the node data acquisition operation is generally realized by a sleep timer inside the microprocessor to achieve periodic and continuous wake-up, acquisition, and upload, that is, the data transmission between the node and the information processing center has the characteristics of periodicity, persistence, and small data volume.

[0004] Therefore, in specific application scenarios, such as placing the nodes in a relatively narrow and enclosed environment with electromagnetic shielding from the outside world, and at the same time, the nodes need to perform controllable burst high-speed acquisition and upload operations on target data, the current conventional wireless sensor network cannot solve the problems of stable communication between the nodes and the control center, and the compatibility of the low-power working mode of the nodes and the high data transmission rate. Summary of the Invention

[0005] Based on the technical problems existing in the background art, the present invention proposes a wireless sensor data acquisition system for electromagnetic shielding scenarios.

[0006] A wireless sensor data acquisition system for electromagnetic shielding scenarios proposed by the present invention includes: an industrial control computer, a wireless instruction transceiver unit, a wireless signal relay unit, and a data acquisition unit; the industrial control computer is installed with supporting upper computer control software and is connected to the wireless instruction transceiver unit through a USB serial port; the wireless instruction transceiver unit, the wireless signal relay unit, and the data acquisition unit are connected to each other in series through a two-layer ZigBee star network hardware; the wireless instruction transceiver unit consists of a power supply module one and a communication module one, and has the function of completing the execution, forwarding, and feedback of specific instructions of the industrial control computer; the wireless signal relay unit consists of a power supply module two, a communication module two, a GPS timing module, a data receiving module, and a data processing and saving module, and has the function of completing the connection of the two-level wireless star instruction network, relaying the transmission of industrial control computer instructions, and receiving and saving the acquired data; the data acquisition unit consists of a power supply module three, a sensor module, a signal conditioning module, a clock module, a communication module three, a data acquisition module, a data saving module, and a data uploading module, and has the function of completing the acquisition, saving, and uploading of strain data in three directions at the measurement position.

[0007] Preferably, the instruction communication links in the wireless instruction transceiver unit, the wireless signal relay unit, and the data acquisition unit are built in the form of a ZigBee star network topology, and the data communication links are built in the Wi-Fi mode.

[0008] Preferably, the instruction communication adopts a two-layer star network series connection mode. The first layer of the network consists of the wireless instruction sending unit connected to the industrial control computer and each wireless signal relay unit, and the second layer of the network consists of each wireless signal relay unit and the specific data acquisition unit; the two layers of the network are connected through the wireless signal relay unit, enabling the industrial control computer to achieve stable communication with the data acquisition unit inside the relatively enclosed item with electromagnetic shielding effect.

[0009] Preferably, the wireless instruction transceiver unit, the wireless signal relay unit, and the data acquisition unit can all receive instructions from the industrial control computer, and can all judge, execute, and continue the transmission operation of the instructions according to the hierarchical information contained in the instructions.

[0010] Preferably, after receiving the data acquisition instruction, the data acquisition unit sets the acquisition parameters according to the instruction, and acquires the strain data in three directions at a specific position of the item to be measured; the strain data is obtained through a strain gauge circuit, and after being amplified twice, it is converted into a digital quantity by a high-precision analog-to-digital conversion module. After the converted digital quantity data is read by the control chip, it is temporarily stored in an external cache chip, and is saved to an external flash chip after the acquisition is completed, and finally the acquired data is uploaded after receiving the upload instruction.

[0011] Preferably, after receiving the data saving instruction, the wireless signal relay unit activates the TCP server of the data link, receives the collected data from the data collection unit, and saves the collected data in the form of a TXT file to the SD card memory of the wireless signal relay unit through the file system.

[0012] The beneficial effects of the present invention are as follows:

[0013] (1) The wireless sensor data acquisition system for electromagnetic shielding scenarios of the present invention can achieve stable communication between the upper computer and the acquisition nodes in a relatively narrow and enclosed environment with electromagnetic shielding from the outside through the series connection of two-layer wireless transmission network hardware, broadening the application scenarios of the wireless sensor network. Moreover, compared with a single network, the series connection of two-layer networks can accommodate more nodes for networking.

[0014] (2) The wireless sensor data acquisition system for electromagnetic shielding scenarios of the present invention can effectively combine the advantages of different short-range wireless communication protocols by using different transmission methods for different links, increasing the system transmission bandwidth while reducing the system power consumption, and significantly improving the upload efficiency of the collected data in this embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 : Schematic structural diagram of the instruction link and data link of the present invention;

[0016] Figure 2 : Schematic structural diagram of the wireless instruction transceiver unit of the present invention;

[0017] Figure 3 : Schematic structural diagram of the wireless signal relay unit of the present invention;

[0018] Figure 4 : Schematic structural diagram of the data collection unit of the present invention;

[0019] Figure 5 : Working flowchart of the upper computer control software of the present invention;

[0020] Figure 6 : Working flowcharts of the wireless instruction transceiver unit, wireless signal relay unit, and data collection unit of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Embodiment 1:

[0023] Refer to Figure 1-6, a wireless sensor data acquisition system for electromagnetic shielding scenarios of the present invention includes: an industrial computer, a wireless instruction transceiver unit, a wireless signal relay unit, and a data acquisition unit. The wireless sensor data acquisition system of the present invention uses ZigBee and Wi-Fi to build the system instruction and data links, achieving a large data transmission bandwidth while maintaining a low system power consumption; using a two-layer wireless transmission network in a hardware series connection method to achieve stable communication between the information center and all acquisition units; using a wireless transmission method with low power consumption and small transmission bandwidth to build the instruction transmission link, and using another wireless transmission method with a larger bandwidth to build the data transmission link.

[0024] The industrial computer is installed with supporting upper computer control software, which has the functions of displaying the working status of each unit of the system and simplifying the system operation, and is connected to the wireless instruction transceiver unit through a USB serial port. The industrial computer sends control instructions to all nodes in the system and receives information feedback, and at the same time displays the working status of the entire system for the operator. The main function of the upper computer control software is to display the working status of each part of the current system to the operator and assist the staff to perform specific function operations.

[0025] The wireless instruction transceiver unit, the wireless signal relay unit, and the data acquisition unit are interconnected through a two-layer ZigBee star network in a hardware series connection method.

[0026] The wireless instruction transceiver unit, the wireless signal relay unit, and the data acquisition unit can all receive instructions from the industrial computer, and can all judge, execute, and continue to transmit the instructions according to the hierarchical information contained in the instructions.

[0027] The instruction communication link in the wireless instruction transceiver unit, the wireless signal relay unit, and the data acquisition unit is built in the form of a ZigBee star network topology, and the data communication link is built in the Wi-Fi mode.

[0028] The instruction communication adopts a two-layer star network series connection method. The first layer network consists of the wireless instruction sending unit connected to the industrial computer and each wireless signal relay unit. The second layer network consists of each wireless signal relay unit and specific data acquisition units; the two layers of networks are connected through the wireless signal relay unit, enabling the industrial computer to communicate stably with the data acquisition units inside relatively enclosed items with electromagnetic shielding effects.

[0029] The two-layer star network is connected in series through hardware, specifically referring to: using two star networks built based on ZigBee. The wireless instruction transceiver unit serves as the center of the first layer network and forms a star network with all wireless signal relay units. Each wireless signal relay unit serves as the center of the second-level network respectively and forms a second-level star network with a certain number of data acquisition units respectively.

[0030] Two different transmission links, specifically: a ZigBee method with low power consumption and small data bandwidth is used to build an instruction transmission network, and a Wi-Fi method with relatively high power consumption and large data bandwidth is used to build a data transmission link. Since the operation of the data transmission link of this system is controlled by corresponding instruction operations and is in a non-powered state under idle conditions, the entire system meets the requirements of power consumption and data throughput rate.

[0031] The wireless instruction transceiver unit, as the hub for communication between the rest of the system and the host computer software, consists of Power Module 1 and Communication Module 1 (including a serial communication module and a wireless communication module), and has the functions of specific execution, forwarding, and feedback of industrial control computers. It receives instructions from the host computer software through the serial port, transmits them to the specified nodes within the system wirelessly, receives the return information, and feeds it back to the host computer software. The wireless instruction transceiver unit is usually directly connected to the industrial control computer installed with the host computer software and can be directly powered by the industrial control computer.

[0032] The wireless signal relay unit consists of Power Module 2, Communication Module 2 (including two wireless communication modules), a GPS timing module, a data receiving module, and a data processing and storage module, and has the functions of connecting two-level wireless star instruction networks, relaying the transmission of industrial control computer instructions, and receiving and storing the collected data.

[0033] The wireless signal relay unit is responsible for receiving the wireless instructions transmitted by the wireless instruction transceiver unit, passing them to another wireless microcontroller inside the unit through a wired serial port, and then transmitting the instructions wirelessly to the data acquisition unit again. At the same time, the wireless relay unit is also responsible for receiving the collected data from the data acquisition unit through a wireless communication method with high communication bandwidth and storing it in the memory inside the unit. Specifically, after receiving the data storage instruction, the wireless signal relay unit activates the TCP server of the data link, receives the collected data from the data acquisition unit, and saves the collected data in the SD card memory of the wireless signal relay unit in the TXT file format through the file system.

[0034] Among the two wireless communication modules in Communication Module 2, one serves as a networking node of the first-level ZigBee star network, and the other serves as the central node of the second-level ZigBee star network. They are connected through the serial port. Power Module 2 is responsible for powering each part of the unit. The wireless signal relay unit can be powered by a fixed power supply or a lithium battery according to specific application scenarios; the GPS timing module is responsible for providing a reference clock for the second-level star network; the data receiving module serves as the TCP server of Wi-Fi and receives the collected data from the data acquisition unit; the data acquisition and storage module processes the collected original data and stores it in the SD card inside the unit.

[0035] The data acquisition unit is composed of a power supply module III, a sensor module, a signal conditioning module, a clock module, a communication module III, a data acquisition module, a data storage module, and a data transmission module, and has the functions of collecting, storing, and uploading three-channel strain data.

[0036] The power supply module III is responsible for supplying power to each part of the data acquisition unit. A lithium battery is used as the power supply to improve the portability of the device. The clock module is used to provide a sampling clock to the data acquisition module. The communication module III is a wireless communication module, which is used to receive specific instructions transmitted by the host computer and upload the execution feedback of the instructions. The data acquisition module is used to amplify the data detected by the sensor and convert it through analog-to-digital conversion. In this embodiment, the strain data of a specific item within a certain time window is collected. The data storage module reads and stores the collected data within a specified time. The data transmission module, as a TCP client of Wi-Fi, sends the collected sensor data to the wireless signal relay unit.

[0037] After receiving the data acquisition instruction, the data acquisition unit sets the acquisition parameters according to the instruction and collects the strain data in three directions at a specific position of the item to be measured. The strain data is obtained through a strain gauge circuit, amplified in two stages, and then converted into digital quantities by a high-precision analog-to-digital conversion module. The converted digital quantity data is read by the control chip, temporarily stored in an external cache chip, saved to an external flash chip after the acquisition is completed, and finally the collected data is uploaded after receiving the upload instruction.

[0038] A wireless sensor data acquisition system for an electromagnetic shielding scenario according to the present invention, a schematic structural diagram of its instruction link and data link is as Figure 1 shown.

[0039] In the industrial control computer, wireless signal transceiver unit, wireless signal relay unit, and data acquisition unit of the wireless sensor data acquisition system of the present invention, a network is formed by connecting them in series through two layers of wireless network hardware. The industrial control computer installed with the supporting host computer control software is connected to the primary coordinator in the wireless transceiver unit through a serial port. The primary coordinator is wirelessly connected to the primary terminal in the wireless signal relay unit and forms a star network; the secondary coordinator in the wireless signal is connected to the primary terminal through a serial port and is wirelessly connected to the secondary terminal in the data acquisition unit through wireless means, forming a second-level star network. At the same time, the wireless signal relay unit is also connected to the data acquisition unit through a second wireless means with a larger bandwidth to form a separate data transmission link. The two-level network can ensure that when the data acquisition unit is deployed inside a relatively enclosed measurement item where a stable wireless connection cannot be established with the wireless command transceiver unit, by placing the antenna of the secondary coordinator in the wireless signal relay unit at a specific position of the measurement item, stable communication of the secondary network can be achieved, and the command information between the networks is transmitted through the hardware serial port. At the same time, the networking of the separate data link of the system can ensure that the acquisition system has the ability to efficiently and suddenly upload the acquired data while maintaining a relatively low operating power consumption.

[0040] The two-level command link in the wireless sensor data acquisition system of the present invention selects the ZigBee technology in the 2.4G frequency band to build a wireless communication network. The relatively low power consumption and the maximum communication bandwidth of 250 Kbps of the ZigBee technology meet the requirements for small data volume and low-power command transmission in this embodiment; the data transmission link in the system selects the Wi-Fi technology in the 2.4G frequency band to build, and the strain data collected is transmitted through the TCP protocol. The larger communication bandwidth of the Wi-Fi technology improves the transmission efficiency of the system when transmitting a large amount of collected data.

[0041] Figure 2 It is a schematic structural diagram of the wireless command transceiver unit of the present invention. As Figure 2 shown, the wireless command transceiver unit includes a power supply module (i.e., power supply module one), a USB-to-serial port module (i.e., serial port communication module), and a primary command link microcontroller (i.e., wireless communication module). The power supply module can stabilize the output voltage of the industrial control computer or lithium battery and supply power to the remaining modules; the USB-to-serial port module converts the serial port signal of the primary command link microcontroller into a USB differential signal to achieve serial port communication between the wireless command transceiver unit and the industrial control computer; the primary command link microcontroller selects a chip integrated with the ZigBee protocol as the coordinator to build a star network.

[0042] Figure 3This is a schematic structural diagram of the wireless signal relay unit of the present invention. The wireless signal relay unit includes a power management module (i.e., power module two), a primary instruction link microcontroller, and a secondary instruction link microcontroller (i.e., communication module two), a GPS timing module, a collected data processing microcontroller, a data storage module (i.e., data processing and saving module), and a data link communication microcontroller (i.e., data receiving module). The power management module is used to stabilize the output voltage of power sources such as lithium batteries and supply power to the remaining modules of the unit. The primary instruction link microcontroller selects a chip integrated with the ZigBee protocol and sets it as a terminal node to form a network with the wireless instruction transceiver unit. The secondary instruction link microcontroller selects a chip integrated with the ZigBee protocol as the coordinator of the secondary network. The two chips are connected through a serial port to transmit and receive instruction data frames bidirectionally. The GPS timing module is used to provide a collection time reference for each secondary star network. Since in this embodiment, each collection unit needs to collect the strain data of each part of the item within a time window after a specified moment on the item surface starts, each node needs to be able to refer to a common time reference. The collected data microcontroller selects an STM32 series chip and is connected to the primary instruction link microcontroller and the data link microcontroller, and is used to receive and process instructions from the industrial control computer, read the strain data from the data link microcontroller, and save it in the data storage module. The data storage module includes a cache chip and an SD card. Since in this embodiment, the strain data requires a high collection frequency and a certain collection duration, each node will save a large amount of raw data after each collection. These data ultimately need to be transmitted to the wireless signal relay unit and converted into TXT files by the control chip and written into the SD card for storage. Since the power consumption of the data transmission link in the system is relatively large, in order to minimize the operating power consumption of this part as much as possible, currently, the collected data is first received into the cache chip to maximize the throughput speed of the data transmission link. After the transmission is completed, the power supply of the transmission link control chip is turned off, and the control chip converts the original collected data in the cache and writes it into the SD card. The data link communication microcontroller selects a chip integrated with the Wi-Fi protocol. In this embodiment, this chip is connected to the control chip, and can build a Wi-Fi network through the control instructions sent by the control chip, and establish a TCP connection with the chip in the data collection node as a TCP server.

[0043] Figure 4This is a schematic diagram of the structure of the data acquisition unit of the present invention. The data acquisition unit includes a power management module (i.e., Power Module 3), a clock module, a secondary instruction link microcontroller (and Communication Module 3), a strain gauge sensor (i.e., Sensor Module), a signal conditioning module, an analog-to-digital conversion module, an acquisition data processing microcontroller (i.e., Data Acquisition Module), a data storage module (i.e., Data Saving Module), and a data link communication microcontroller (i.e., Data Upload Module). The secondary instruction link microcontroller also selects a chip integrated with the ZigBee protocol to form a secondary star network with the wireless relay unit. The strain gauge sensor is selected. Each strain rosette has three resistors and can measure strain data in three directions. The signal conditioning module includes two-stage signal amplification circuits. The first stage uses an instrumentation amplifier to provide differential amplification with high input impedance and high common-mode rejection ratio. The analog-to-digital conversion module uses a low-power, high-precision successive approximation analog-to-digital converter. The acquisition data processing microcontroller is responsible for controlling the operation of the analog-to-digital chip and reading the converted data, and storing it in the data storage module. The cache chip is used to quickly cache the converted strain data during the acquisition stage. After the acquisition is completed, the control chip saves the data in the cache in the flash memory to achieve power-off preservation, and waits for the industrial control computer to send an upload instruction before sending the acquired data to the wireless signal relay unit. The data link communication microcontroller also selects a chip integrated with the Wi-Fi protocol. This chip acts as a TCP client during operation to establish a TCP connection with the wireless signal relay unit.

[0044] Figure 5 This is the working flowchart of the upper computer control software supporting the present invention. The specific process of the upper computer software is as follows:

[0045] (1) The operator inputs specific system instructions, which include operations such as system networking unit inspection, setting data acquisition parameters, and uploading acquired data in this embodiment;

[0046] (2) Generate an instruction operation sequence according to the input specific instructions. Since the upper computer needs to control multiple system units in this embodiment, specific instructions for controlling system units at different levels and positions need to be generated according to the specific operations input by the operator;

[0047] (3) The upper computer software sequentially sends instruction frames to specific system units through the wireless instruction transceiver unit according to the generated instruction operation sequence;

[0048] (4) The upper computer receives the execution feedback information of the instruction frame, displays it on the software interface for the operator to confirm, and updates the instruction sequence according to the feedback result;

[0049] (5) After receiving the instruction feedback once, the upper computer software checks whether the instruction sequence is empty. If it is, it reports the operation execution result. If not, it repeats the content of steps (3) and (4).

[0050] Figure 6 This is the workflow diagram of each unit of the present invention. The specific workflow of each unit is as follows:

[0051] (1) Each hierarchical unit receives the instruction frame transmitted by the host computer in a wireless or wired manner.

[0052] (2) Each unit determines the hierarchical information carried in the received instruction. If it is the same as that of this unit, it performs corresponding operations according to the instruction information in the instruction frame. If the hierarchical information is greater than that of this unit, the instruction frame needs to be continuously transmitted downward through the above-mentioned instruction link;

[0053] (3) After each unit performs the specific operation of this unit, it needs to generate a return frame in a fixed format according to the operation result;

[0054] (4) Each unit sequentially transmits the generated return to the host computer software upward;

[0055] (5) If each unit transmits an instruction frame downward, it needs to wait for a return frame within a limited time and transmit the return through step (4). If no return frame is received within the limited time, this unit needs to generate a return frame containing relevant information and transmit it through step (4).

[0056] A wireless sensor data acquisition system for electromagnetic shielding scenarios of the present invention can achieve stable communication between the host computer and the acquisition nodes in a relatively narrow and enclosed environment with electromagnetic shielding from the outside through two-layer wireless transmission network hardware in series, broadening the application scenarios of the wireless sensor network. Moreover, compared with a single network, the two-layer network in series can accommodate more nodes for networking.

[0057] A wireless sensor data acquisition system for electromagnetic shielding scenarios of the present invention can effectively combine the advantages of different short-range wireless communication protocols by using different transmission methods for different links, increasing the system transmission bandwidth while reducing the system power consumption, and significantly improving the upload efficiency of the acquired data in this embodiment.

[0058] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A wireless sensor data acquisition system for electromagnetic shielding scenarios, characterized in that: include: An industrial computer, a wireless command transceiver unit, a wireless signal relay unit and a data acquisition unit; the industrial computer is installed with matching host computer control software and is connected to the wireless command transceiver unit through a USB serial port; the wireless command transceiver unit, the wireless signal relay unit and the data acquisition unit are connected to each other through two layers of ZigBee star network hardware series connection; The wireless command transceiver unit is composed of a power module 1 and a communication module 1, and has the functions of executing, forwarding and returning specific commands of the industrial computer; The wireless signal relay unit is composed of a power module 2, a communication module 2, a GPS timing module, a data receiving module and a data processing and storage module, and has the functions of completing the connection of the two-level wireless star command network, relaying the transmission of industrial computer commands, and receiving and storing collected data; The data acquisition unit is composed of a power module three, a sensor module, a signal conditioning module, a clock module, a communication module three, a data acquisition module, a data storage module and a data upload module, and has the functions of completing the acquisition, storage and upload of three-channel strain data.

2. A wireless sensor data acquisition system for electromagnetic shielding scenarios according to claim 1, characterized in that: The command communication links among the wireless command transceiver unit, the wireless signal relay unit and the data acquisition unit are constructed in a ZigBee star network topology, and the data communication links are constructed in a Wi-Fi manner.

3. A wireless sensor data acquisition system for electromagnetic shielding scenarios according to claim 1, characterized in that: The command communication adopts a two-layer star network series connection. The first layer of the network consists of a wireless command sending unit connected to the industrial computer and each wireless signal relay unit, and the second layer of the network consists of each wireless signal relay unit and a specific data acquisition unit. The two layers of the network are connected through the wireless signal relay unit, so that the industrial computer and the data acquisition unit inside a relatively closed object with an electromagnetic shielding effect can achieve stable communication.

4. A wireless sensor data acquisition system for electromagnetic shielding scenarios according to claim 1, characterized in that: The wireless command transceiver unit, the wireless signal relay unit and the data acquisition unit can all receive commands from the industrial computer, and can all judge, execute and continue transmission operations on the commands according to the hierarchical information contained in the commands.

5. The wireless sensor data acquisition system for electromagnetic shielding scenarios according to claim 1, characterized in that: After receiving the data collection instruction, the data collection unit sets the collection parameters according to the instruction and collects the strain data of the three directions of the specific position of the measured object; the strain data is obtained through the strain gauge circuit, and after two-stage amplification, it is converted into a digital quantity by the high-precision analog-to-digital conversion module. After the converted digital quantity data is read by the control chip, it is temporarily stored in the external cache chip, and is saved in the external flash memory chip after the collection is completed. Finally, the collected data will be uploaded after receiving the upload instruction.

6. A wireless sensor data acquisition system for electromagnetic shielding scenarios according to claim 1, characterized in that: After receiving the data saving instruction, the wireless signal relay unit starts the TCP server of the data communication link, receives the collected data from the data collection unit, and saves the collected data in the SD card memory of the wireless signal relay unit in the TXT file format through the file system.

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