Strain signal acquisition circuit for pipeline strain test

Abstract

The utility model relates to the field of electronic hardware circuit design, and particularly discloses a strain signal acquisition circuit for a pipeline strain test, and the circuit comprises a power supply management module which is used for converting power supply voltage to VCC and taking the power supply voltage as a voltage source and a voltage reference of other modules; the bridge module is used for converting a resistance change signal generated by the strain gauge into a voltage signal; the signal conditioning module is used for amplifying the voltage signal output by the bridge module into a strain analog signal by using an operational amplifier; and the Bluetooth wireless transmission module is used for converting the strain analog signal into a digital signal and sending the digital signal to an upper computer so as to complete the acquisition of the pipeline strain signal. The device is compact in structure, complete in function, and suitable for a pipeline strain test environment requiring miniaturization and battery off-line power supply.

Description

Technical Field

[0001] This utility model relates to a strain signal acquisition circuit, specifically a strain signal acquisition circuit for pipeline strain testing, and belongs to the field of electronic hardware circuit design. Background Technology

[0002] Currently, strain gauge measurement is widely used in industrial applications, and wired or wireless data acquisition systems are also widely used. However, existing strain acquisition systems cannot meet the needs of limited installation space in pipeline areas and the requirement for a certain degree of offline power supply. Utility Model Content

[0003] To address the problems in the prior art, this utility model provides a strain signal acquisition circuit for pipeline strain testing.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] The strain signal acquisition circuit for pipeline strain testing includes:

[0006] The power management module is used to convert the power supply voltage to VCC and serve as a voltage source and voltage reference for other modules.

[0007] A bridge module is used to convert the resistance change signal generated by the strain gauge into a voltage signal;

[0008] The signal conditioning module is used to amplify the voltage signal output by the bridge module into a strain simulation signal using an operational amplifier;

[0009] The Bluetooth wireless transmission module converts the strain analog signal into a digital signal and sends it to the host computer to complete the acquisition of the pipeline strain signal.

[0010] Preferably, the power management module includes a terminal P2, a switch S1, capacitors C2, C5, C1, C6, and a three-terminal voltage regulator chip U1. One end of terminal P2 is connected to switch S1, and the other end of terminal P2 is grounded. Switch S1 connects capacitors C1 and C2 in parallel. One end of capacitors C1 and C2 is connected to the three-terminal voltage regulator chip U1, and the other end is grounded. One end of the three-terminal voltage regulator chip U1 is grounded, and the other end is connected to capacitors C5 and C6 in parallel, and one end of capacitors C5 and C6 is grounded.

[0011] Preferably, the bridge module includes a terminal P1, a resistor R2, a resistor R3, and a resistor R4; terminal P1 is connected to an external strain gauge, resistor R2 is connected to the external strain gauge and grounded, resistor R3 is connected to VCC and resistor R4, and resistor R4 is connected to resistor R2 and resistor R3. The positive and negative terminals of the bridge module are led out from between resistor R3 and resistor R4 and between terminal P1 and resistor R2, respectively.

[0012] Preferably, the signal conditioning module includes capacitor C3, capacitor C4, resistors R1, R5, R6, R9, R10, R11, R12, and operational amplifier chip U2. Capacitor C3 is connected to resistor R6, and one end of resistor R6 is connected to operational amplifier chip U2 and resistor R9. Capacitor C4 is connected to resistor R5, and one end of resistor R5 is connected to operational amplifier chip U2 and resistor R10. Both ends of resistor R1 are connected to operational amplifier chip U2. Resistors R11 and R12 are connected to form a voltage divider circuit, with one end of resistor R11 grounded and one end of resistor R12 connected to VCC. Resistors R9 and R10 are both connected to the output terminal of the voltage divider circuit.

[0013] Preferably, the Bluetooth wireless transmission module includes a Bluetooth chip U3 and its peripheral circuits. The peripheral circuits include an inductor L1, a capacitor C7, a capacitor C8, and an antenna. One end of the inductor L1 is connected to the Bluetooth chip U3 and the capacitor C7, and the other end is connected to the antenna and the capacitor C8. The capacitors C8 and C7 are connected in parallel, and one end of the capacitors C8 and C7 is grounded.

[0014] Preferably, capacitors C1, C3, C4, C6, C7, and C8 are all MLCC capacitors, while capacitors C2 and C5 are both electrolytic capacitors.

[0015] The beneficial effects of this utility model are:

[0016] This utility model discloses a strain signal acquisition circuit for pipeline strain testing, comprising a power management module, a bridge module, a signal conditioning module, and a Bluetooth wireless transmission module. It features a compact structure, complete functionality, and is suitable for pipeline strain testing environments requiring miniaturization and offline battery power. Attached Figure Description

[0017] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is the circuit diagram of the power management module of this utility model.

[0019] Figure 2 This is the circuit diagram of the bridge module of this utility model.

[0020] Figure 3 This is the circuit diagram of the signal conditioning module of this utility model.

[0021] Figure 4 This is the circuit diagram of the Bluetooth wireless transmission module of this utility model. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] The strain signal acquisition circuit for pipeline strain testing includes:

[0024] like Figure 1 As shown, the power management module is used to convert the power supply voltage to VCC and serve as a voltage source and voltage reference for other modules.

[0025] Optionally, the power management module includes terminal P2, switch S1, capacitors C2, C5, C1, C6, and a three-terminal voltage regulator chip U1. One end of terminal P2 is connected to switch S1, and the other end of terminal P2 is grounded. Switch S1 is connected to capacitors C1 and C2, which are connected in parallel. One end of capacitors C1 and C2 is connected to the three-terminal voltage regulator chip U1, and the other end is grounded. One end of the three-terminal voltage regulator chip U1 is grounded, and the other end is connected to capacitors C5 and C6, which are connected in parallel, and one end of capacitors C5 and C6 is grounded.

[0026] Terminal P2 is connected to an external power source. When switch S1 is closed, the power supply is connected to the circuit. The three-terminal voltage regulator chip U1 regulates the power supply voltage to VCC. The power supply voltage and VCC are decoupled and noise is reduced through capacitors C1, C2, C5, and C6.

[0027] like Figure 2 As shown, the bridge module is used to convert the resistance change signal generated by the strain gauge into a voltage signal.

[0028] Optionally, the bridge module includes terminal P1, resistor R2, resistor R3 and resistor R4; terminal P1 is connected to an external strain gauge, resistor R2 is connected to the external strain gauge and grounded, resistor R3 is connected to VCC and resistor R4, resistor R4 is connected to resistor R2 and resistor R3, and the positive and negative outputs of the bridge module are led out from between resistor R3 and resistor R4 and between terminal P1 and resistor R2, respectively.

[0029] After the two poles of the strain gauge are connected to terminal P1, the Wheatstone bridge is turned on, converting the resistance change signal of the strain gauge into a voltage signal, which is output through the signal+ and signal- signal lines.

[0030] like Figure 3 As shown, the signal conditioning module is used to amplify the voltage signal output by the bridge module into a strain analog signal using an operational amplifier.

[0031] Optionally, the signal conditioning module includes capacitor C3, capacitor C4, resistors R1, R5, R6, R9, R10, R11, R12, and operational amplifier chip U2. Capacitor C3 is connected to resistor R6, and one end of resistor R6 is connected to operational amplifier chip U2 and resistor R9 respectively. Capacitor C4 is connected to resistor R5, and one end of resistor R5 is connected to operational amplifier chip U2 and resistor R10 respectively. Both ends of resistor R1 are connected to operational amplifier chip U2. Resistors R11 and R12 are connected to form a voltage divider circuit, with one end of resistor R11 grounded and one end of resistor R12 connected to VCC. Resistors R9 and R10 are both connected to the output terminal of the voltage divider circuit.

[0032] Capacitors C3 and C4 decouple the negative and positive outputs of the bridge module. Resistors R10 and R9 both extract VCC / 2 from the voltage divider circuit. Resistors R6 and R9, and R5 and R10, respectively, pull the decoupled strain signal up to VCC / 2 to set the common-mode voltage to VCC / 2. The voltage signal is amplified by operational amplifier chip U2 and resistor R1, outputting a strain analog signal which is then transmitted to the Bluetooth wireless transmission module via the out signal line. Resistor R1 is a gain control resistor used to adjust the amplification factor of operational amplifier chip U2.

[0033] like Figure 4 As shown, the Bluetooth wireless transmission module converts the strain analog signal into a digital signal, and then converts the digital signal into Bluetooth radio electromagnetic waves to be sent to the host computer, thus completing the acquisition of the pipeline strain signal.

[0034] Optionally, the Bluetooth wireless transmission module includes a Bluetooth chip U3 and its peripheral circuits. The peripheral circuits include an inductor L1, a capacitor C7, a capacitor C8, and an antenna. One end of the inductor L1 is connected to the Bluetooth chip U3 and the capacitor C7, and the other end is connected to the antenna and the capacitor C8. The capacitors C8 and C7 are connected in parallel, and one end of the capacitors C8 and C7 is grounded.

[0035] The strain analog signal output by the signal conditioning module is converted into a digital signal by the internal ADC of the Bluetooth chip U3, and then sent as a wireless data packet using the Bluetooth 5.0 protocol. Finally, the strain analog signal is sent to the host computer through the antenna.

[0036] The capacitors C1, C3, C4, C6, C7, and C8 mentioned above are all MLCC capacitors, while capacitors C2 and C5 are both electrolytic capacitors.

[0037] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A strain signal acquisition circuit for pipeline strain testing, characterized in that, include: The power management module is used to convert the power supply voltage to VCC and serve as a voltage source and voltage reference for other modules. A bridge module is used to convert the resistance change signal generated by the strain gauge into a voltage signal; The signal conditioning module is used to amplify the voltage signal output by the bridge module into a strain simulation signal using an operational amplifier; The Bluetooth wireless transmission module converts the strain analog signal into a digital signal and sends it to the host computer to complete the acquisition of the pipeline strain signal.

2. The strain signal acquisition circuit for pipeline strain testing according to claim 1, characterized in that, The power management module includes terminal P2, switch S1, capacitor C2, capacitor C5, capacitor C1, capacitor C6 and three-terminal voltage regulator chip U1. One end of terminal P2 is connected to switch S1, and the other end of terminal P2 is grounded. Switch S1 is connected to capacitors C1 and C2, which are connected in parallel. One end of capacitors C1 and C2 is connected to a three-terminal voltage regulator chip U1, and the other end is grounded. One end of the three-terminal voltage regulator chip U1 is grounded, and the other end is connected to capacitors C5 and C6, which are connected in parallel, and one end of capacitors C5 and C6 is grounded.

3. The strain signal acquisition circuit for pipeline strain testing according to claim 1, characterized in that, The bridge module includes terminal P1, resistor R2, resistor R3 and resistor R4; Terminal P1 is connected to an external strain gauge, resistor R2 is connected to the external strain gauge and grounded, resistor R3 is connected to VCC and resistor R4, resistor R4 is connected to resistor R2 and resistor R3, and the positive and negative terminals of the bridge module are led out from between resistor R3 and resistor R4 and between terminal P1 and resistor R2, respectively.

4. The strain signal acquisition circuit for pipeline strain testing according to claim 1, characterized in that, The signal conditioning module includes capacitor C3, capacitor C4, resistors R1, R5, R6, R9, R10, R11, R12 and operational amplifier chip U2; The capacitor C3 is connected to the resistor R6. One end of the resistor R6 is connected to the operational amplifier chip U2 and the resistor R9. The capacitor C4 is connected to the resistor R5. One end of the resistor R5 is connected to the operational amplifier chip U2 and the resistor R10. Both ends of the resistor R1 are connected to the operational amplifier chip U2. The resistors R11 and R12 are connected to form a voltage divider circuit. One end of the resistor R11 is grounded, and one end of the resistor R12 is connected to VCC. The resistors R9 and R10 are both connected to the output of the voltage divider circuit.

5. The strain signal acquisition circuit for pipeline strain testing according to claim 1, characterized in that, The Bluetooth wireless transmission module includes a Bluetooth chip U3 and its peripheral circuitry. The peripheral circuit includes an inductor L1, a capacitor C7, a capacitor C8, and an antenna. One end of the inductor L1 is connected to the Bluetooth chip U3 and the capacitor C7, and the other end is connected to the antenna and the capacitor C8. The capacitors C8 and C7 are connected in parallel and one end of the capacitors C8 and C7 is grounded.

6. The strain signal acquisition circuit for pipeline strain testing according to claim 2, characterized in that, Capacitors C1, C3, C4, C6, C7, and C8 are all MLCC capacitors, while capacitors C2 and C5 are both electrolytic capacitors.

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