Low-frequency vibration acquisition equipment

Abstract

The utility model discloses a low frequency vibration acquisition device, comprising a housing, and an Ethernet transceiver, a POE power supply, a processor, a low frequency vibration sensor, an analog signal power supply and a signal conditioning filter circuit which are arranged in the housing, the housing is provided with a waterproof interface, the POE power supply is respectively connected with the analog signal power supply, the processor and the waterproof interface, the analog signal power supply is further connected with the low-frequency vibration sensor and the signal conditioning and filtering circuit, the processor is further connected with the signal filtering and conditioning circuit and the Ethernet transceiver, and the Ethernet transceiver is further connected with the waterproof interface. The low-frequency vibration acquisition equipment optimizes low-frequency signal scenes, is small in structure and convenient to deploy, adopts single-network-cable POE power supply and data communication, adopts a totally-closed waterproof aluminum shell, can resist severe working environments, and is beneficial to long-term, stable and continuous monitoring of large-scale structures.

Description

Technical Field

[0001] This utility model relates to the field of low-frequency vibration acquisition technology, and in particular to a low-frequency vibration acquisition device. Background Technology

[0002] With the development of modern technology, the design and construction of large-scale infrastructure faces increasing challenges, including stringent requirements for long-term stability, reliability, and resistance to natural disasters. These scenarios necessitate continuous monitoring of large structures to assess their condition and provide early warnings of potential risks. Therefore, the design, deployment, detection, and computation of sensors have become a focal point of discussion.

[0003] The vibration frequencies that need to be detected in large structures are very low, even below a few tenths of a Hz, and existing technologies are not good at acquiring low-frequency signals.

[0004] In addition, the equipment is not ideal for harsh environments such as outdoor open spaces and industrial sites, as it lacks stability and ease of deployment. Utility Model Content

[0005] The main purpose of this invention is to propose a low-frequency vibration acquisition device for low-frequency signal scenarios, aiming to achieve long-term and stable continuous monitoring of large structures.

[0006] To achieve the above objectives, this utility model provides a low-frequency vibration acquisition device, comprising: a housing, an Ethernet transceiver, a PoE power supply, a processor, a low-frequency vibration sensor, an analog signal power supply, and a signal conditioning and filtering circuit disposed within the housing, wherein the housing is provided with a waterproof interface, wherein the PoE power supply is connected to the analog signal power supply, the processor, and the waterproof interface respectively, the analog signal power supply is also connected to the low-frequency vibration sensor and the signal conditioning and filtering circuit, the processor is also connected to the signal filtering and conditioning circuit and the Ethernet transceiver, and the Ethernet transceiver is also connected to the waterproof interface.

[0007] A further technical solution of this utility model is that the signal filtering and conditioning circuit includes two stages. The first stage is a second-order Butterworth filter circuit, which is used to improve the input impedance of the signal source. The second stage is a fully differential amplifier and anti-aliasing filter circuit, which is used to drive the back-end ADC and prevent signal aliasing.

[0008] A further technical solution of this utility model is that the second-order Butterworth filter circuit includes amplifier U1, amplifier U2, amplifier U3, amplifier U4, resistor R3, resistor R4, resistor R9, resistor R10, capacitor C2, capacitor C5, capacitor C8 and capacitor C11.

[0009] Pin 3 of amplifier U1 is connected to one end of resistor R3 and pin 2 of amplifier U1. The other end of resistor R3 is connected to one end of resistor R4 and one end of capacitor C2. One end of resistor R4 is connected to pin 1 of amplifier U2 and one end of capacitor C5. The other end of capacitor C5 is grounded. The other end of capacitor C2 is connected to pin 3 of amplifier U2, pin 2 of amplifier U2, and the fully differential amplifier and anti-aliasing filter circuit.

[0010] Pin 3 of amplifier U3 is connected to one end of resistor R9 and pin 2 of amplifier U3. The other end of resistor R9 is connected to one end of resistor R10 and one end of capacitor C8. One end of resistor R10 is connected to pin 1 of amplifier U4 and one end of capacitor C11. The other end of capacitor C11 is grounded. The other end of capacitor C8 is connected to pin 3 of amplifier U4, pin 2 of amplifier U4, and the fully differential amplifier and anti-aliasing filter circuit.

[0011] A further technical solution of this utility model is that the fully differential amplifier and anti-aliasing filter circuit includes resistors R5, R1, R6, capacitor C1, R7, R8, R12, C12, C9, amplifier U5, capacitor C6, capacitor C7, and capacitor C10.

[0012] One end of resistor R5 is connected to pin 3 of amplifier U2, and the other end is connected to pin 1 of amplifier U5, one end of capacitor C1, and one end of resistor R1. The other end of capacitor C1 is connected to one end of resistor R6, pin 2 of amplifier U5, the other end of resistor R1, the other end of resistor R6, one end of capacitor C7, one end of capacitor C6, and the other end of capacitor C6 is grounded.

[0013] One end of resistor R7 is connected to pin 3 of amplifier U4, and the other end is connected to pin 3 of amplifier U5, one end of capacitor C12, and one end of resistor R12. The other end of capacitor C12 is connected to one end of resistor R8 and pin 6 of amplifier U5. The other end of resistor R8 is connected to the other end of resistor R12, the other end of capacitor C7, and one end of capacitor C10. The other end of capacitor C10 is grounded.

[0014] One end of the capacitor C9 is connected to pin 4 of the amplifier U5, and the other end is connected to pin 6 of the amplifier U5.

[0015] A further technical solution of this utility model is that the analog signal power supply includes two stages. The first stage is a precision voltage reference source circuit, which is used to output the voltage reference required by the sensor. The second stage is a low-pass filter circuit composed of zero-drift precision operational amplifiers, and the output is through a transistor to improve the driving capability.

[0016] A further technical solution of this utility model is that the precision voltage reference source circuit includes a voltage reference source element, capacitor C1, capacitor C2 and capacitor C5;

[0017] Pin 1 of the voltage reference source element is connected to one end of capacitor C1 and one end of capacitor C2. The other ends of capacitor C1 and capacitor C2 are grounded. Pin 3 of the voltage reference source element is connected to one end of capacitor C5 and grounded. Pin 2 of the voltage reference source element is connected to the other end of capacitor C5 and the low-pass filter circuit composed of the zero-drift precision operational amplifier.

[0018] A further technical solution of this utility model is that the low-pass filter circuit composed of the zero-drift precision operational amplifier includes amplifier U6, capacitor C3, capacitor C4, capacitor C6, capacitor C7, resistor R1, resistor R2, resistor R3 and MOSFET Q.

[0019] Pin 1 of amplifier U6 is connected to pin 2 of the voltage reference source element. Pin 2 of amplifier U6 is connected to one end of capacitor C3 and one end of capacitor C4. The other ends of capacitor C3 and capacitor C4 are grounded. Pin 3 of amplifier U6 is connected to one end of resistor R1 and one end of capacitor C6. The other end of capacitor C6 is connected to pin 5 of amplifier U6 and one end of resistor R2. Pin 4 of amplifier U6 is grounded. The other end of resistor R1 is connected to the base (B) of MOSFET Q. The other end of resistor R2 is connected to one end of resistor R3, the emitter (E) of MOSFET Q, and one end of capacitor C7. The other end of resistor R3 is connected to the other end of capacitor C7 and grounded.

[0020] A further technical solution of this utility model is that the outer shell includes an upper cover and a lower cover, a level is provided on the upper cover, an opening is made on the surface of the upper cover, and a waterproof interface is provided at the opening.

[0021] A further technical solution of this utility model is that a waterproof silicone ring is embedded at the connection between the upper cover and the lower cover.

[0022] A further technical solution of this utility model is that the waterproof interface is an RJ45 waterproof interface.

[0023] This utility model of low-frequency vibration acquisition device is optimized for low-frequency signal scenarios. It has a compact structure, is easy to deploy, uses a single-network cable for PoE power supply and data communication, and has a fully enclosed waterproof aluminum shell, which can withstand harsh working environments and is conducive to long-term stable continuous monitoring of large structures. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is an exploded structural diagram of a preferred embodiment of the low-frequency vibration acquisition device of this utility model;

[0026] Figure 2 This is a structural block diagram of a preferred embodiment of the low-frequency vibration acquisition device of this utility model;

[0027] Figure 3 This is a schematic diagram of the circuit structure of a signal conditioning and filtering circuit;

[0028] Figure 4 This is a schematic diagram of the circuit structure of an analog signal power supply.

[0029] Explanation of icon numbers:

[0030] 1. Housing; 2. Ethernet transceiver; 3. PoE power supply; 4. Processor; 5. Low-frequency vibration sensor; 6. Analog signal power supply; 7. Signal conditioning and filtering circuit; 8. Waterproof interface; 9. Top cover; 10. Bottom cover; 11. Waterproof silicone ring.

[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0034] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0035] This utility model proposes a low-frequency vibration acquisition device, such as... Figures 1 to 4 As shown, a preferred embodiment of the low-frequency vibration acquisition device of this utility model includes a housing 1, an Ethernet transceiver 2, a PoE power supply 3, a processor 4, a low-frequency vibration sensor 5, an analog signal power supply 6, and a signal conditioning and filtering circuit 7 disposed within the housing 1. The housing 1 is provided with a waterproof interface 8. The PoE power supply 3 is connected to the analog signal power supply 6, the processor 4, and the waterproof interface 8. The analog signal power supply 6 is also connected to the low-frequency vibration sensor 5 and the signal conditioning and filtering circuit 7. The processor 4 is also connected to the signal filtering and conditioning circuit and the Ethernet transceiver 2. The Ethernet transceiver 2 is also connected to the waterproof interface 8.

[0036] In this embodiment, the outer shell 1 comprises an upper cover 9 and a lower cover 10, which are integrally formed by CNC milling from a single piece of aluminum and have a conductive anodized surface. A waterproof silicone ring 11 is embedded at the joint between the upper cover 9 and the lower cover 10 to achieve waterproofing.

[0037] In this embodiment, considering that the low-frequency vibration sensor 5 measures the vibration signal in the vertical direction, a level is embedded in the top of the cover 9 to assist construction personnel in horizontal installation in order to obtain accurate data.

[0038] The surface of the top cover 9 has openings for installing the waterproof interface 8. The waterproof interface 8 adopts an RJ45 waterproof interface 8, which achieves overall waterproof sealing, good electromagnetic shielding characteristics, and good thermal conductivity, thereby ensuring the stable and reliable operation of the equipment in various extreme environments.

[0039] This invention uses an RJ45 waterproof interface 8 to seal the Ethernet transceiver and POE power supply 3, thereby reducing the number of external interfaces and lowering the risk of seal failure. It can achieve a communication rate of 100Mbps over long distances and ensures the flexibility of equipment deployment.

[0040] In this embodiment, the low-frequency vibration sensor 5 has a frequency response range of 0-550Hz to the vibration signal. Therefore, a signal filtering and conditioning circuit is needed to filter out interference and noise outside the frequency band. The signal filtering and conditioning circuit includes two stages. The first stage is a second-order Butterworth filter circuit, which is used to increase the input impedance of the signal source. The cutoff frequency is 6kHz, and the band-stop frequency is 340kHz (-70dB). The second stage is a fully differential amplifier and anti-aliasing filter circuit, which is used to drive the back-end ADC and prevent signal aliasing.

[0041] Specifically, the second-order Butterworth filter circuit includes amplifiers U1, U2, U3, and U4, resistors R3, R4, R9, and R10, and capacitors C2, C5, C8, and C11.

[0042] Pin 3 of amplifier U1 is connected to one end of resistor R3 and pin 2 of amplifier U1. The other end of resistor R3 is connected to one end of resistor R4 and one end of capacitor C2. One end of resistor R4 is connected to pin 1 of amplifier U2 and one end of capacitor C5. The other end of capacitor C5 is grounded. The other end of capacitor C2 is connected to pin 3 of amplifier U2, pin 2 of amplifier U2, and the fully differential amplifier and anti-aliasing filter circuit.

[0043] Pin 3 of amplifier U3 is connected to one end of resistor R9 and pin 2 of amplifier U3. The other end of resistor R9 is connected to one end of resistor R10 and one end of capacitor C8. One end of resistor R10 is connected to pin 1 of amplifier U4 and one end of capacitor C11. The other end of capacitor C11 is grounded. The other end of capacitor C8 is connected to pin 3 of amplifier U4, pin 2 of amplifier U4, and the fully differential amplifier and anti-aliasing filter circuit.

[0044] In this embodiment, the fully differential amplifier and anti-aliasing filter circuit includes resistors R5, R1, R6, capacitor C1, R7, R8, R12, C12, C9, amplifier U5, capacitor C6, capacitor C7, and capacitor C10.

[0045] One end of resistor R5 is connected to pin 3 of amplifier U2, and the other end is connected to pin 1 of amplifier U5, one end of capacitor C1, and one end of resistor R1. The other end of capacitor C1 is connected to one end of resistor R6 and pin 2 of amplifier U5. The other end of resistor R1 is connected to the other end of resistor R6, one end of capacitor C7, one end of capacitor C6, and the other end of capacitor C6 is grounded.

[0046] One end of resistor R7 is connected to pin 3 of amplifier U4, and the other end is connected to pin 3 of amplifier U5, one end of capacitor C12, and one end of resistor R12. The other end of capacitor C12 is connected to one end of resistor R8 and pin 6 of amplifier U5. The other end of resistor R8 is connected to the other end of resistor R12, the other end of capacitor C7, and one end of capacitor C10. The other end of capacitor C10 is grounded.

[0047] One end of capacitor C9 is connected to pin 4 of amplifier U5, and the other end is connected to pin 6 of amplifier U5.

[0048] In this embodiment, the analog signal power supply 6 includes two stages. The first stage is a precision voltage reference source circuit, which is used to output the voltage reference required by the sensor. The second stage is a low-pass filter circuit composed of zero-drift precision operational amplifiers, and the output is through a transistor to improve the driving capability, thereby providing the sensor with a low-noise, stable and accurate voltage reference and power supply capability.

[0049] Specifically, the precision voltage reference source circuit includes a voltage reference source element, capacitor C1, capacitor C2, and capacitor C5.

[0050] Pin 1 of the voltage reference source element is connected to one end of capacitor C1 and one end of capacitor C2. The other ends of capacitor C1 and capacitor C2 are grounded. Pin 3 of the voltage reference source element is connected to one end of capacitor C5 and grounded. Pin 2 of the voltage reference source element is connected to the other end of capacitor C5. The low-pass filter circuit is composed of zero-drift precision operational amplifier.

[0051] The low-pass filter circuit composed of zero-drift precision operational amplifiers includes amplifier U6, capacitors C3, C4, C6, and C7, resistors R1, R2, and R3, and MOSFET Q.

[0052] Pin 1 of amplifier U6 is connected to pin 2 of the voltage reference source element. Pin 2 of amplifier U6 is connected to one end of capacitor C3 and one end of capacitor C4. The other ends of capacitor C3 and capacitor C4 are grounded. Pin 3 of amplifier U6 is connected to one end of resistor R1 and one end of capacitor C6. The other end of capacitor C6 is connected to pin 5 of amplifier U6 and one end of resistor R2. Pin 4 of amplifier U6 is grounded. The other end of resistor R1 is connected to the base (B) of MOSFET Q. The other end of resistor R2 is connected to one end of resistor R3, the emitter (E) of MOSFET Q, and one end of capacitor C7. The other end of resistor R3 is connected to the other end of capacitor C7 and grounded.

[0053] This utility model of low-frequency vibration acquisition device is optimized for low-frequency signal scenarios. It has a compact structure, is easy to deploy, uses a single-network cable for PoE power supply and data communication, and has a fully enclosed waterproof aluminum shell, which can withstand harsh working environments and is conducive to long-term stable continuous monitoring of large structures.

[0054] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A low-frequency vibration acquisition device, characterized in that, include: The housing includes an Ethernet transceiver, a PoE power supply, a processor, a low-frequency vibration sensor, an analog signal power supply, and a signal conditioning and filtering circuit. The housing has a waterproof interface. The PoE power supply is connected to the analog signal power supply, the processor, and the waterproof interface. The analog signal power supply is also connected to the low-frequency vibration sensor and the signal conditioning and filtering circuit. The processor is also connected to the signal conditioning and filtering circuit and the Ethernet transceiver. The Ethernet transceiver is also connected to the waterproof interface.

2. The low-frequency vibration acquisition device according to claim 1, characterized in that, The signal filtering and conditioning circuit includes two stages. The first stage is a second-order Butterworth filter circuit, which is used to increase the input impedance of the signal source. The second stage is a fully differential amplifier and anti-aliasing filter circuit, which is used to drive the back-end ADC and prevent signal aliasing.

3. The low-frequency vibration acquisition device according to claim 2, characterized in that, The second-order Butterworth filter circuit includes amplifiers U1, U2, U3, and U4, resistors R3, R4, R9, and R10, and capacitors C2, C5, C8, and C11. Pin 3 of amplifier U1 is connected to one end of resistor R3 and pin 2 of amplifier U1. The other end of resistor R3 is connected to one end of resistor R4 and one end of capacitor C2. One end of resistor R4 is connected to pin 1 of amplifier U2 and one end of capacitor C5. The other end of capacitor C5 is grounded. The other end of capacitor C2 is connected to pin 3 of amplifier U2, pin 2 of amplifier U2, and the fully differential amplifier and anti-aliasing filter circuit. Pin 3 of amplifier U3 is connected to one end of resistor R9 and pin 2 of amplifier U3. The other end of resistor R9 is connected to one end of resistor R10 and one end of capacitor C8. One end of resistor R10 is connected to pin 1 of amplifier U4 and one end of capacitor C11. The other end of capacitor C11 is grounded. The other end of capacitor C8 is connected to pin 3 of amplifier U4, pin 2 of amplifier U4, and the fully differential amplifier and anti-aliasing filter circuit.

4. The low-frequency vibration acquisition device according to claim 3, characterized in that, The fully differential amplifier and anti-aliasing filter circuit includes resistors R5, R1, R6, capacitor C1, R7, R8, R12, C12, C9, amplifier U5, capacitor C6, capacitor C7, and capacitor C10. One end of resistor R5 is connected to pin 3 of amplifier U2, and the other end is connected to pin 1 of amplifier U5, one end of capacitor C1, and one end of resistor R1. The other end of capacitor C1 is connected to one end of resistor R6, pin 2 of amplifier U5, the other end of resistor R1, the other end of resistor R6, one end of capacitor C7, one end of capacitor C6, and the other end of capacitor C6 is grounded. One end of resistor R7 is connected to pin 3 of amplifier U4, and the other end is connected to pin 3 of amplifier U5, one end of capacitor C12, and one end of resistor R12. The other end of capacitor C12 is connected to one end of resistor R8 and pin 6 of amplifier U5. The other end of resistor R8 is connected to the other end of resistor R12, the other end of capacitor C7, and one end of capacitor C10. The other end of capacitor C10 is grounded. One end of the capacitor C9 is connected to pin 4 of the amplifier U5, and the other end is connected to pin 6 of the amplifier U5.

5. The low-frequency vibration acquisition device according to claim 4, characterized in that, The analog signal power supply consists of two stages. The first stage is a precision voltage reference source circuit, which is used to output the voltage reference required by the sensor. The second stage is a low-pass filter circuit composed of zero-drift precision operational amplifiers, and the output is through a transistor to improve the driving capability.

6. The low-frequency vibration acquisition device according to claim 5, characterized in that, The precision voltage reference source circuit includes a voltage reference source element, capacitor C1, capacitor C2, and capacitor C5; Pin 1 of the voltage reference source element is connected to one end of capacitor C1 and one end of capacitor C2. The other ends of capacitor C1 and capacitor C2 are grounded. Pin 3 of the voltage reference source element is connected to one end of capacitor C5 and grounded. Pin 2 of the voltage reference source element is connected to the other end of capacitor C5 and the low-pass filter circuit composed of the zero-drift precision operational amplifier.

7. The low-frequency vibration acquisition device according to claim 6, characterized in that, The low-pass filter circuit composed of the zero-drift precision operational amplifier includes amplifier U6, capacitors C3, C4, C6, and C7, resistors R1, R2, and R3, and MOSFET Q. Pin 1 of amplifier U6 is connected to pin 2 of the voltage reference source element. Pin 2 of amplifier U6 is connected to one end of capacitor C3 and one end of capacitor C4. The other ends of capacitor C3 and capacitor C4 are grounded. Pin 3 of amplifier U6 is connected to one end of resistor R1 and one end of capacitor C6. The other end of capacitor C6 is connected to pin 5 of amplifier U6 and one end of resistor R2. Pin 4 of amplifier U6 is grounded. The other end of resistor R1 is connected to the base (B) of MOSFET Q. The other end of resistor R2 is connected to one end of resistor R3, the emitter (E) of MOSFET Q, and one end of capacitor C7. The other end of resistor R3 is connected to the other end of capacitor C7 and grounded.

8. The low-frequency vibration acquisition device according to claim 1, characterized in that, The outer casing includes an upper cover and a lower cover. A level is provided on the upper cover, and an opening is provided on the surface of the upper cover. The waterproof interface is provided at the opening.

9. The low-frequency vibration acquisition device according to claim 8, characterized in that, A waterproof silicone ring is embedded at the connection between the upper cover and the lower cover.

10. The low-frequency vibration acquisition device according to claim 1, characterized in that, The waterproof interface is an RJ45 waterproof interface.

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