A method and device for testing bolt stability based on the Internet of Things

Abstract

The present invention relates to the field of measurement technology, and discloses a method and device for testing the stability of bolts based on the Internet of Things, effectively solving the problem that the prior art lacks an effective method for measuring the stability of bolts. The measurement method provided by the present invention specifically includes: obtaining the bolt signal detected by the coil based on the detector and the detector and transmitting it to the processing module to obtain the resonance frequency of the bolt signal, calculating the stability of the bolt based on the resonance frequency of the bolt signal, and outputting the stability of the bolt to the server to achieve effective and accurate measurement of the stability of the bolt.

Description

Technical Field

[0001] The present invention relates to the field of measurement technology, and specifically to a method and device for testing the stability of bolts based on the Internet of Things. Background Art

[0002] Bolts are widely used in various structures in fields such as construction and machinery. The installation state of bolts, especially the stability after installation, is directly related to the use safety of these building and mechanical structures.

[0003] In some special field buildings, affected by vibrations, strong winds, sunlight, and ground settlement, the already installed bolts will gradually loosen. Over time, the degree of loosening increases continuously, resulting in the building being unable to ensure structural stability and ultimately causing safety accidents. Since the field is desolate and uninhabited, it is difficult for personnel to arrive. In addition, the bolts of buildings often do not have reserved personnel inspection channels. This series of problems makes the maintenance and detection of the connection state of bolts very difficult. The existing method is still to manually mark the positions of bolts and visually inspect them manually. Due to the uneven levels of workers and the lack of a quantification method, the judgment of whether a bolt is loose will be affected by subjective experience. This kind of influence will cause loose bolts not to be detected and bolts that are not loose to be misjudged as loose. On some machinery that works for a long time, bolts will gradually loosen due to vibrations and continuously changing stress conditions. Since the machinery needs to work continuously, it makes it very difficult to detect and repair the stability of bolts.

[0004] For such problems, other indirect measurement methods can also be used, such as measuring the structural deformation of buildings, the settlement degree of buildings, the sudden change of stress in mechanical structures, and detecting the rotation of nuts by encoders. However, all these detection and measurement methods have various defects. For example, structural abnormalities cannot be detected in time, and it is impossible to recover once an abnormality is found. If the loosening angle is relatively small, it is very difficult to detect. The installation conditions of sensors are relatively high, etc. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the present invention provides a method and device for testing the stability of bolts based on the Internet of Things.

[0007] (2) Technical Solutions

[0008] To solve the above problems, the present invention provides a method for testing the stability of bolts based on the Internet of Things. The method specifically includes:

[0009] Based on a detector and a detector, the bolt signal detected by the coil is transmitted to the processing module to obtain the resonance frequency of the bolt signal;

[0010] The stability of the bolt is calculated based on the resonance frequency of the bolt signal;

[0011] The stability of the bolt is output to the server.

[0012] The present invention also provides a device for testing the stability of a bolt based on the Internet of Things. The device includes an acquisition module, a calculation module, and an output module;

[0013] The acquisition module is used to transmit the bolt signal detected by the coil obtained based on the detector and the detector under test to the processing module to obtain the resonance frequency of the bolt signal;

[0014] The calculation module is used to calculate the stability of the bolt based on the resonance frequency of the bolt signal;

[0015] The output module is used to output the stability of the bolt to the server.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the present invention provides a method and a device for testing the stability of a bolt based on the Internet of Things, having the following beneficial effects:

[0018] 1. The measurement method and device provided by the present invention use a detector and a detector under test to detect the bolt signal of the bolt under test and calculate the resonance frequency of the bolt signal, so as to obtain the stability of the bolt under test. According to the stability of the bolt under test, the bolt signal is output to the server, thus providing a convenient and simple way to obtain the stability of the bolt under test, so as to perform corresponding processing on the bolt under test, and avoiding the problem that the existing measurement method cannot accurately measure the bolt under test.

[0019] 2. The measurement method and device provided by the present invention boost and reduce the noise of the detected bolt signal during detection, so as to reduce the influence of other interferences in the building on the bolt signal, ensure the accuracy of the bolt signal, and further ensure the accuracy of the present measurement method and device.

[0020] 3. The measurement method and device provided by the present invention set a formula for the resonance frequency and stability of the bolt signal. Based on this formula, the stability of the bolt under test can be obtained quickly and accurately. Description of the drawings

[0021] Figure 1 It is a schematic diagram of the side-mounted detector provided by the present invention;

[0022] Figure 2 It is a schematic diagram of the covering detector provided by the present invention.

[0023] Figure 3 It is a schematic diagram of the single-coil detector provided by the present invention.

[0024] Figure 4 Schematic diagram of the detector with double coils provided by the present invention.

[0025] Figure 5 Schematic diagram of the gripper-type detector provided by the present invention.

[0026] Figure 6 Schematic diagram of the nut-type detector provided by the present invention.

[0027] Figure 7 Schematic diagram of the detector with magnet provided by the present invention.

[0028] Figure 8 Schematic diagram of the internal structure of the gripper-type detector provided by the present invention.

[0029] Figure 9 Schematic diagram of the structure of the circuit block diagram of the detector provided by the present invention.

[0030] Figure 10 Schematic diagram of the detector of the present invention when used in the field.

[0031] Figure 11 Schematic diagram of the thermo-welding type fixing base structure provided by the present invention.

[0032] Figure 12 Schematic diagram of the snap-type fixing base structure provided by the present invention.

[0033] Figure 13 Timing state diagram of the DAC control circuit provided by the present invention.

[0034] Figure 14 Flow chart of the measurement method provided by the present invention.

[0035] Figure 15 Flow chart of the device provided by the present invention. Detailed implementation manners

[0036] 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 the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] Please refer to Figures 1 - 14 , the present invention provides a new technical solution: a method for testing the stability of bolts based on the Internet of Things. The method specifically includes:

[0038] Step S1: Based on the detector and the detector, obtain the bolt signal detected by the coil and transmit it to the processing module to obtain the resonance frequency of the bolt signal.

[0039] Specifically, the detector and the detector are used to obtain the bolt signal of the bolt to be measured. The bolt to be subjected to stability detection is called the bolt to be measured. The detector is connected to the bolt to be measured, and the detector transmits the bolt signal output by the detector to the processing module according to the bolt signal. The processing module obtains its resonance frequency according to the bolt signal.

[0040] Specifically, the coils of the detector are divided into single coils and double coils. The single coil is a wire with insulated surface wound around the central iron column of the detector. As Figure 4 shown, one end of the wire of the single coil is connected to the signal ground, and the other end is connected to the preset acquisition port and transmission port of the acquisition and transmission module. The double coil is two wires with insulated surface wound around the central iron column of the detector. One end of each of the two coils 27 and 28 of the double coil is connected to the signal ground, and the other ends are respectively connected to the acquisition port and transmission port of the acquisition and transmission module. The connection sequence and direction of the coils do not affect the measurement. The result is as Figure 3 shown.

[0041] The detector is divided into two types: side-mounted type and covering type. The side-mounted detector is as Figure 1 shown. 5 is the coil, and the coil can be in two ways: single coil or double coil. 4 is the output module, and there are various optional configurations for the side-mounted detector, such as 485 interface, LED display, 4G module, etc. Figure 1 In , 3 is the detector main body, which includes a power supply module, a signal acquisition and signal transmission module, a boost and noise reduction module, and a processing module. 1 is the fixed base, and there are various optional schemes for the fixed base, such as clamp type, thermal welding type, and snap type. Figure 1 The base shown is a clamp type base. By adjusting the limit screw, the detector and the stable surface are stably connected. The stable surface also needs to be stably connected to the base, that is, the detector is stably connected to the base through the stable surface. Otherwise, the accuracy of the measured bolt signal cannot be guaranteed. For the thermal welding type, its structure is as Figure 11 shown. The base and the stable surface are connected by the hot melt solder shown in 21 and 22. For the snap type, as Figure 12 shown, it is connected to the stable surface through the snap shown in 23 and 24 and the friction provided by the rubber shown in 25 and 26; The covering detector is as Figure 2 shown. Among them, 12 and 13 are fixed walls, which are used to fix the detector to the stable surface by welding or screwing. Figure 2 In , 3 is the detector main body, and its structure and function are the same as those of the side-mounted type. Figure 2 In , 5 is the detection rod, and its structure and function are the same as those of the side-mounted type. Figure 2 The detection rod in and Figure 1The coils have the same function and can be considered as the same object. The output module of the covering detector is on the upper surface of the main body.

[0042] The detectors include two types: gripper type and nut type. As Figure 5 shown, the gripper type detector is divided into two parts: a magnet 6 and a base 7. The base 7 is fixed to the stud nut by a gripper. There is a layer of protective material outside the magnet 6 to ensure the normal magnetism of the magnet 6 for a long time. The magnet 6 is connected to the base by an adhesive. As Figure 6 shown, the nut type detector is divided into: a magnet 6 and a base 7. The base 7 is fixed on the thread of the stud. And the magnet 6 in both types of detectors is as Figure 7 shown. The magnet 6 is divided into three parts: a magnet 15, a protective shell 14, and a connection surface 16. The connection surface 16 and the base are connected by an adhesive material.

[0043] As Figure 8 shown for the gripper type detector, where 17 is the head of the stud, 18 is the fixed arm, the fixed arm 18 engages with the stud head 17, 19 is the adjusting plate used to ensure the stable fixation of the detector and the stud, 20 is the adjusting screw used to adjust the adjusting plate. The adjusting screw will expand after heating to lock the position of the adjusting plate and ensure its stability. 6 is the magnet. After the detector is adjusted to a stable position by the adjusting screw, the adjusting screw is heated to fix it.

[0044] As Figure 9 shown for the circuit block diagram of the detector main body, where the function of the power supply module is to provide power for the detector and supply power to other modules based on the control of the control module. The power supply module can be a storage battery or access an external power supply through a reserved interface. In order to prevent the influence of the power supply module on the detection-related structures, the power supply module needs to be placed at the bottom of the detector body. The control module is connected to the power supply module, and there are two connection lines between them, including a power supply line and a command line. The command line is used to transmit the control commands of the control module to the power supply module, and the power supply line is responsible for the power supply module to supply power to the control module. When not performing measurement tasks, the power supply module only supplies power to the processing module. At this time, j1 supplies power, and the standby chip in the processing module is in a low-power state. When an instruction sent by an electronic dog or other means activates the processing module, the processing module sends an instruction to the power supply module through pin j2, and the power supply module supplies power to the signal acquisition and sending module through pin n2.

[0045] Wait for the signal acquisition and sending module to start up. After the startup is completed, the signal acquisition and signal sending module sends a rising edge signal through f1 to inform the processing module that the startup is complete. The processing module uses g2 as clk and g3 to send the measurement data pair in spi mode for configuration. The configuration content is as follows: test sequence position + n* gain offset parameter. After the communication is completed, the processing module enters the sleep state.

[0046] After the signal acquisition and transmission module receives the measurement data configuration, the low-power chip in the signal acquisition and signal transmission module starts to control the DAC control circuit and the ADC control circuit to enter the working state. For the DAC control circuit, according to the starting point register address of the transmission signal sent by the low-power chip, the address control port is enabled. At this time, the DAC control circuit sends enable signals to ROM0 to ROM7 in sequence, and sends a read signal to the DAC after each enable. The timing state diagram of the DAC control circuit is shown in FIG. Figure 13 As shown, the data from Rom0 to Rom7 are read according to the preset length, and the data is spliced ​​into n*8 bytes. Under the control of the DAC control circuit, the data of the transmitted time domain signal is read and transmitted. The multiplexer controls the source of the data read by the DAC under the control of the DAC timing control circuit. The reading speed requirement of the ROM chip is reduced by using multiple ROM chips in time-sharing mode, and the power consumption is reduced by controlling the sleep of the ROM chips in turn.

[0047] For side-mounted detectors, the distance between the coil and the magnet-containing part of the device under test should be less than 15 mm and greater than 2 mm; for covered detectors, the magnet-containing part should be as far away from the fixed arm of the device under test as possible; Figure 10 As shown, the nut-type test device stud 10 is combined with the nut 8 and fixed on the stable surfaces 2 and 9, and the studs 10 and 11 form a completed bolt. After the detectors 1, 3, 4 and 5 are stably connected to the stable surface, the distance between the detection rod 5 and the magnet 6 should be less than 5mm and greater than 2mm. When the tested bolt is in the field, there is no condition to lay a communication line, so the output interface 4 on the detector is a 4G module for returning information. There is a battery inside the detector body 3 for power supply. In order to ensure that the electric energy can be used for a long time, during the non-monitoring time period, the processing module-related equipment in the tester is in a dormant state, and the external low-power timer reaches the preset time, and the processing module is awakened by the timer.

[0048] Furthermore, the bolt signal detected by the acquisition coil is transmitted to the central processing module via the boost noise reduction module, so as to obtain the resonant frequency of the bolt signal, which specifically includes the following steps:

[0049] A1, the signal acquisition and transmission module changes the magnetic field of the coil through the boost and noise reduction module;

[0050] Specifically, the signal acquisition and transmission module is connected to the control module through multiple parallel data lines. When detecting the bolt under test, the control module internally stores a signal, which is waveform data. The control module outputs the signal to the signal acquisition and transmission module, and the signal acquisition and transmission module outputs the signal to the boost and noise reduction module. After the boost and noise reduction module boosts the signal, it is sent out through the coil in the tester, causing a change in the magnetic field of the coil of the detector under test.

[0051] Specifically, the multiple parallel data lines are used to send signals to control the signal acquisition and transmission functions of the signal acquisition and transmission module. The control module is connected to the output interface through a standard uart interface, and is used to control the output interface to send a stability signal representing the bolt stability to the server.

[0052] A2. Based on the change in the magnetic field of the coil, the detector generates a back electromotive force;

[0053] Specifically, when the magnetic field of the coil of the detector under test changes, the detector under test generates vibrations, driving the bolt under test to vibrate, and the vibration of the magnet-containing body in the detector under test causes the coil of the detector to generate a back electromotive force.

[0054] A3. Based on the back electromotive force, a bolt signal is obtained, and the bolt signal is detected by the boost and noise reduction module and output to the processing module;

[0055] Specifically, after the back electromotive force is detected by the detector, a bolt signal is output. The bolt signal is boosted and noise-reduced by the boost and noise reduction module and then output to the processing module. The boosting generally amplifies the bolt signal, and the noise reduction is to filter the bolt signal to reduce the presence of noise. The signal acquisition and transmission module and the boost and noise reduction module are connected through three data paths, which are: the acquisition signal path, the transmission signal path, and the control signal path. As Figure 9 shown, the transmission signal path is also connected to the coil. The acquisition signal path (connected through d3 and e3), the transmission signal path (connected through e1 and d1), and the control signal path (d2 and e2). The signal acquisition and transmission module controls the gain and filtering parameters of the boost and noise reduction module through the control signal path. The signal acquisition and transmission module sends the signal to the boost and noise reduction module through the transmission signal path. The boost and noise reduction module will increase the signal strength through the gain circuit and send the signal to the coil. The signal acquisition and transmission module receives the signal that has been noise-reduced by the boost and noise reduction module through the acquisition signal path

[0056] Specifically, the boost noise reduction module is also connected to the coil. The connection between the boost noise reduction module and the coil is divided into two paths: a transmission path and a sampling path. One end of the transmission path is connected to the coil, and the other end is connected to the transmission interface of the boost noise reduction module. The signal sent by the transmission port is the signal that has been processed by the signal acquisition and transmission module through boost noise reduction. One end of the sampling path is connected to the other end of the coil, and the other end is connected to the sampling circuit of the boost noise reduction module. The sampling circuit is responsible for filtering and noise reduction processing of the received bolt signal.

[0057] Further, the bolt signal obtained in step A3 is preprocessed and then detected by the boost noise reduction module and output to the processing module.

[0058] Specifically, the bolt signal is divided into several groups. The frequencies in the same group are synthesized into a comb spectrum. Then, the bolt signal is converted from a frequency-domain signal to a time-domain signal. The sampling circuit is set to collect the time-domain signal at a certain sampling interval. The collected time-domain signal is pre-emphasized according to the gain characteristic of the amplifier to obtain the final time-domain signal that can be output, that is, the time-domain signal at this time is the bolt signal. That is, all the bolt signals to be sent to the processing module are preprocessed and stored in the ROM of the control module. When needed, they are directly read by the processing module.

[0059] Specifically, the basis for grouping mainly includes two aspects: power saving and IO speed. Power saving means that when the grouping is too small and multiple groups are generated, when multiple groups enter the processing module in turn, the sleep time of the processing module is reduced. Frequent switching from sleep will consume additional power. And IO speed means that when the grouping is too large, resulting in a too large group size, when the processing module receives a group with a too large size, it will take more time while other groups are waiting, reducing the efficiency of the processing module.

[0060] A4. The processing module converts the bolt signal into a frequency-domain signal and obtains the resonance frequency according to the amplitudes of different frequencies in the frequency-domain signal.

[0061] Specifically, after the processing module selects the bolt signal from the received signals, it performs algorithmic noise reduction on the bolt signal again to ensure the accuracy of the bolt signal and reduce the possibility of inaccuracy caused by interference. Then, the bolt signal is converted from the time domain to the frequency domain through FFT, and finally the resonance frequency is solved according to the amplitudes of different frequencies in the frequency-domain signal.

[0062] Specifically, through the cooperation of the signal acquisition and signal transmission module and the boost noise reduction module, the proportion of interference in the received signal in the processing module is reduced, that is, the proportion of the bolt signal in the received signal is increased. Then, the bolt signal in the time domain is converted into the frequency domain and noise is reduced through an algorithm, thereby reducing the influence of other signals except the bolt signal. There is a one-to-one correspondence between the stability and the resonance frequency. In order to reduce the processing consumption of the processing module, the corresponding relationship formula between the stability parameter and the resonance frequency is stored in the ROM. According to the obtained frequency domain data, the frequency with the largest amplitude among all frequencies is obtained, and this frequency is the resonance frequency.

[0063] Step S2: Calculate the stability of the bolt based on the resonance frequency of the bolt signal.

[0064] Specifically, the higher the resonance frequency, the stronger the stability of the bolt. Substitute the resonance frequency into the relationship formula to obtain the stability of this bolt.

[0065] Further, the obtaining the stability of the bolt based on the resonance frequency of the bolt signal is specifically as follows:

[0066]

[0067] Among them, h is the resonance frequency of the measured bolt signal, f(h) is the stability, and the stability calculation formulas for single-coil and double-coil are the same.

[0068] Step S3: Output the stability of the bolt to the server.

[0069] Specifically, the processing module obtains the stable signal of the bolt according to the stability of the bolt, and outputs the stable signal to the server through the output interface. The output interface uses a wireless transmission method to output to the server. According to the obtained stable signal of the measured bolt, an instruction to repair or replace the measured bolt is issued, thereby ensuring the safety of the building where the measured bolt is located.

[0070] The present invention also provides a device for testing the stability of bolts based on the Internet of Things, as Figure 15 shown. The device includes an acquisition module, a calculation module, and an output module;

[0071] The acquisition module is used to obtain the bolt signal detected by the coil based on the detector and the detector and transmit it to the processing module to obtain the resonance frequency of the bolt signal;

[0072] The calculation module is used to calculate the stability of the bolt based on the resonance frequency of the bolt signal;

[0073] The output module is used to output the stability of the bolt to the server.

[0074] Further, the acquisition module includes a detector, a detector under test, a signal acquisition and transmission module, a control module, a boost noise reduction module, and a power supply module.

[0075] Further, the signal acquisition and transmission module and the boost noise reduction module are connected through three data paths, which are respectively: an acquisition signal path, a transmission signal path, and a control signal path. The transmission signal path is also connected to the coil.

[0076] Further, the device includes a control module, which is connected to the power supply module. The connection lines between the two include a power supply line and an instruction line. The instruction line is used to transmit the control instruction of the control module to the power supply module, and the power supply line is responsible for the power supply module to supply power to the control module.

[0077] Further, the control module includes a storage unit for storing the bolt signal obtained by the signal acquisition and transmission module.

[0078] Further, the acquisition module includes:

[0079] A change unit for changing the magnetic field of the coil by the signal acquisition and transmission module through the boost noise reduction module;

[0080] A generation unit for generating a back electromotive force by the detector based on the change of the magnetic field of the coil;

[0081] A detection unit for obtaining a bolt signal based on the back electromotive force. The bolt signal is detected by the boost noise reduction module and output to the processing module;

[0082] An obtaining unit for the processing module to convert the signal into a frequency domain signal and obtain the resonance frequency according to the amplitudes of different frequencies in the frequency domain signal.

[0083] Even further, the detection unit is specifically used for:

[0084] The bolt signal obtained in step A3 is preprocessed and then detected by the boost noise reduction module and output to the processing module.

[0085] Further, the calculation module is specifically used for:

[0086] The stability of the bolt obtained based on the resonance frequency of the bolt signal is specifically:

[0087]

[0088] Where h is the resonance frequency of the measured bolt signal, f(h) is the stability, and the stability calculation formulas for single coils and double coils are the same.

[0089] An apparatus for testing the stability of bolts based on the Internet of Things provided by an embodiment of the present application can implement each process of the embodiment of the above method for testing the stability of bolts based on the Internet of Things, and can achieve the same technical effects. To avoid repetition, details are not described herein again.

[0090] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for testing the stability of bolts based on the Internet of Things, characterized in that: The method specifically includes: Based on a detector and a detector, the bolt signal detected by the coil is transmitted to a processing module to obtain the resonance frequency of the bolt signal. Calculate the stability of the bolt based on the resonance frequency of the bolt signal; specifically, obtaining the stability of the bolt based on the resonance frequency of the bolt signal is as follows: Where h is the resonance frequency of the measured bolt signal, and f(h) is the stability. Output the stability of the bolt to the server. Among them, the step of transmitting the bolt signal detected by the coil to the processing module based on the detector and the detector to obtain the resonance frequency of the bolt signal specifically includes the following steps: A1. The signal acquisition and transmission module changes the magnetic field of the coil through a boost noise reduction module. A2. Based on the change in the magnetic field of the coil, the detector generates a back electromotive force. A3. Obtain a bolt signal based on the back electromotive force, and the bolt signal is detected by the boost noise reduction module and output to the processing module. A4. The processing module converts the signal into a frequency domain signal, and obtains the resonance frequency according to the amplitudes of different frequencies in the frequency domain signal.

2. The method for testing the stability of bolts based on the Internet of Things according to claim 1, characterized in that: The bolt signal obtained in step A3 is preprocessed and then detected by the boost noise reduction module and output to the processing module.

3. A device for testing the stability of bolts based on the Internet of Things, characterized in that: The device includes an acquisition module, a calculation module, and an output module. The acquisition module is used to transmit the bolt signal detected by the coil to the processing module based on a detector and a detector to obtain the resonance frequency of the bolt signal. The calculation module is used to calculate the stability of the bolt based on the resonance frequency of the bolt signal; specifically, obtaining the stability of the bolt based on the resonance frequency of the bolt signal is as follows: Where h is the resonance frequency of the measured bolt signal, and f(h) is the stability. The output module is used to output the stability of the bolt to the server. Among them, the step of transmitting the bolt signal detected by the coil to the processing module based on the detector and the detector to obtain the resonance frequency of the bolt signal specifically includes the following steps: A1. The signal acquisition and transmission module changes the magnetic field of the coil through a boost noise reduction module. A2. Based on the change in the magnetic field of the coil, the detector generates a back electromotive force. A3. Obtain a bolt signal based on the back electromotive force, and the bolt signal is detected by the boost noise reduction module and output to the processing module. A4. The processing module converts the signal into a frequency domain signal, and obtains the resonance frequency according to the amplitudes of different frequencies in the frequency domain signal.

4. The device for testing the stability of bolts based on the Internet of Things according to claim 3, characterized in that: The acquisition module includes a detector, a detector, a signal acquisition and transmission module, a boost noise reduction module, and a power supply module.

5. The device for testing the stability of bolts based on the Internet of Things according to claim 3, characterized in that: The signal acquisition and transmission module and the boost noise reduction module are connected through three data paths, which are: an acquisition signal path, a transmission signal path, and a control signal path. The transmission signal path is also connected to the coil.

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