A signal conditioner for an impact stress wave system

Abstract

The present invention discloses a signal conditioner for an impact stress wave system, which includes a power supply module, a constant current source module, a signal amplification module, and a filtering module; the power supply module converts the input voltage into the voltage required by the system to supply power to the constant current source module, the signal amplification module, and the filtering module; the constant current source module is connected to the accessed acceleration sensor, provides a constant current to the acceleration sensor, and transmits the measured voltage value to the signal amplification module; the signal amplification module is connected to the constant current source module and the filtering module, amplifies the voltage signal measured by the constant current source module, and transmits the amplified signal to the filtering module; the filtering module is connected to the signal amplification module, removes the bottom current from the amplified signal to convert it into a signal voltage, and transmits the signal voltage to the data acquisition card. The present invention realizes the reduction of system noise while being powered by a power supply with strong noise, and improves the measurement accuracy and robustness of the system.

Description

Technical Field

[0001] The present invention belongs to the technical field of non-destructive testing, and more particularly relates to a signal conditioner for an impact stress wave system. Background Art

[0002] Concrete structures, with characteristics such as high strength and large stiffness, are widely used in various buildings and structures. However, due to various factors such as construction and personnel, various quality defect problems of concrete frequently occur, which in turn lead to insufficient concrete strength and even affect the safety performance of buildings, thus threatening the safety of people's lives and property. Therefore, the detection of concrete defects is an important way for concrete quality assessment and safety diagnosis, and is of great significance for maintaining social and economic stability.

[0003] The traditional core drilling method causes local damage to structural concrete and is not suitable for use when the concrete strength grade is low. Concrete non-destructive testing technology detects defect information in concrete without damaging or affecting the concrete, and is the main technology for on-site engineering testing in recent years. The impact stress wave method has advantages such as simple operation and high accuracy and has been widely used in concrete non-destructive testing.

[0004] In the impact stress wave detection system, the signal conditioner is directly connected to the external measurement sensor, and the electronic noise in the signal conditioner directly affects the detection accuracy and precision of the system. Therefore, reducing electronic noise is an important way to improve the measurement accuracy of the system. A main source of electronic noise is the power supply voltage ripple. Currently, the common practice is to increase the capacitance to eliminate the power supply voltage ripple. However, the implementation of a large-capacity capacitor in circuit design will occupy most of the circuit area, and the parameter fluctuations of large capacitors will increase the instability of the system. Another approach is to use a battery with a smaller voltage ripple, but the battery will not only increase the system volume but also make the system application flexibility lower and limit the system working duration.

[0005] Therefore, how to provide a signal conditioner for an impact stress wave system is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a signal conditioner for an impact stress wave system, which realizes reducing the system noise while being powered by a power supply with strong noise, and improves the measurement accuracy and robustness of the system.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A signal conditioner for an impact stress wave system, comprising: a power supply module, a constant current source module, a signal amplification module, and a filtering module; wherein,

[0009] The power supply module is used to convert the input voltage into the voltage required by the system and supply power to the constant current source module, the signal amplification module, and the filtering module;

[0010] The constant current source module is connected to the accessed acceleration sensor, used to provide a constant current to the acceleration sensor, and transmit the measured voltage value to the signal amplification module;

[0011] The signal amplification module is connected between the constant current source module and the filtering module, amplifies the voltage signal measured by the constant current source module, and transmits the amplified signal to the filtering module;

[0012] The filtering module is connected to the signal amplification module, removes the base current from the amplified signal to convert it into a signal voltage, and transmits the signal voltage to the data acquisition card.

[0013] Preferably, the power supply module includes: a boost circuit, a noise reduction circuit, and a voltage stabilization circuit; wherein,

[0014] The boost circuit is connected to an external power supply interface and is used to increase the input low voltage value;

[0015] The noise reduction circuit is connected to the boost circuit and is used to eliminate voltage ripples, reduce system noise, and improve the accuracy of system measurement;

[0016] The voltage stabilization circuit is connected to the noise reduction circuit and is used to stabilize the voltage at a fixed value.

[0017] Preferably, the boost circuit includes: a DC-DC converter U0, an input capacitor C1, an output capacitor C2, a voltage regulating resistor R1, and a voltage regulating resistor R2;

[0018] The input capacitor C1 is directly connected to the external power supply and is used to reduce the influence of AC signals in the power supply on the circuit;

[0019] The DC-DC converter U0 is connected to the input capacitor C1 and is used to amplify the input voltage;

[0020] The output capacitor C2 is connected to the output terminal of the DC-DC converter U0 and is used to reduce the influence of voltage ripples on the circuit;

[0021] The voltage regulating resistor R1 and the voltage regulating resistor R2 are connected to the output terminal of the DC-DC converter U0 and are used to adjust the output voltage value.

[0022] Preferably, the noise reduction circuit includes: a triode Q1, a resistor R3, and a capacitor C3;

[0023] The collector of the triode Q1 is connected to the output of the boost circuit and is used to amplify the smaller capacitor C3 to eliminate voltage ripples;

[0024] The resistor R3 is connected to the emitter and base of the triode Q1 and is used to maintain the emitter junction current of the triode in the amplification range;

[0025] The capacitor C3 is connected between the triode Q1 and the ground and is used to eliminate voltage ripple.

[0026] Preferably, the voltage stabilizing circuit includes: an integrated voltage regulator block U1, a voltage regulating resistor R4, and a voltage regulating resistor R5; the input end of the integrated voltage regulator block U1 is connected to the output of the noise reduction circuit, the voltage regulating terminal of the integrated voltage regulator block U1 is connected to the voltage regulating resistor R4 and the voltage regulating resistor R5; the voltage regulating resistor R4 and the voltage regulating resistor R5 are connected in series and then connected to the output terminal of the integrated voltage regulator block U1 and the ground.

[0027] Preferably, the constant current source module includes: a voltage reference, a differential amplifier U2, an operational amplifier U3, and an output regulating resistor R7; the two input ends of the differential amplifier U2 are connected to the voltage reference; the output end of the operational amplifier U3 is connected to one input end and is connected to the reference terminal of the differential amplifier U2, and the other input end is connected to the output regulating resistor R7 and then connected to the output end and the measuring terminal of the differential amplifier U2; the connection point of the operational amplifier U3 and the output regulating resistor R7 is the constant current source output terminal, and the constant current source output terminal is connected to the acceleration sensor.

[0028] Preferably, the voltage reference includes: a micro-power consumption voltage reference tube D1 and a current limiting resistor R6; the micro-power consumption voltage reference tube D1 and the current limiting resistor R6 are connected in series and then connected to the output of the power supply module.

[0029] Preferably, the signal amplification module includes: a filtering resistor R8, a filtering capacitor C4, operational amplifiers U4, U5, gain adjusting resistors R9, R10, and a gain selection switch K1; the power supplies of the operational amplifiers U4 and U5 are connected to the output terminal of the power supply module, the non-inverting input terminal of the operational amplifier U4 is connected to the non-inverting input terminal of the operational amplifier U5 through the resistor R8, the output terminal of the operational amplifier U4 is connected to the output terminal of the operational amplifier U5 through the gain adjusting resistor R9 and the gain adjusting resistor R10; the gain adjusting resistor R9 is connected between the inverting input terminal and the output terminal of the operational amplifier U4; the inverting input terminal and the output terminal of the operational amplifier U5 are connected and then connected to the gain adjusting resistor R10; the filtering capacitor C4 is connected between the non-inverting input terminal of the operational amplifier U4 and the ground; the gain selection switch K1 is connected in parallel with the gain adjusting resistor R9; the input terminal of the operational amplifier U4 is connected to the constant current source output terminal, and the output terminal of the operational amplifier U4 is the amplified signal.

[0030] Preferably, the filtering module includes a coupling capacitor C5 and a resistor R11; the coupling capacitor C5 is connected to the output terminal of the operational amplifier U4 and the resistor R11; the connection of the coupling capacitor C5 and the resistor R11 is connected to an external data acquisition card; the data acquisition card digitally converts the measurement signal and is connected to the upper computer through a USB cable.

[0031] The beneficial effects of the present invention are as follows:

[0032] The present invention eliminates the voltage ripple of the power supply through a noise reduction circuit, realizes reducing the influence of system noise on the detection result while being powered by a power supply with strong noise, and improves the accuracy and robustness of system measurement. In addition, the adopted noise reduction circuit avoids the problem of increasing the circuit area caused by increasing the capacitance, reduces the volume of the system, and the overall system has the characteristics of miniaturization; the boost circuit of the present invention adopts low-power components such as a small-sized and low-power boost DC-DC converter, a micro-power differential amplifier, and an operational amplifier, and the overall system design has the advantages of low power consumption and high power efficiency; in addition, when the voltage value of the external power supply changes, only the size of the output adjustment resistor in the boost circuit needs to be adjusted to make the output voltage of the power supply module meet the requirements of other circuits. Therefore, the present invention also has high flexibility. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0034] Figure 1 The drawings are the structural schematic diagrams of the present invention.

[0035] Among them, in the figure:

[0036] 1 - Power supply module; 2 - Constant current source module; 3 - Signal amplification module; 4 - Filtering module; 5 - Acceleration sensor; 6 - Data acquisition card; 7 - Upper computer; 8 - USB cable; 11 - Boost circuit; 12 - Noise reduction circuit; 13 - Voltage stabilization circuit; 21 - Voltage reference. Specific Embodiments

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Please refer to the attached Figure 1 , the present invention provides a signal conditioner for an impact stress wave system, comprising: a power supply module 1, a constant current source module 2, a signal amplification module 3 and a filtering module 4; wherein,

[0039] The power supply module 1 is used to convert the input voltage into the voltage required by the system and supply power to the constant current source module 2, the signal amplification module 3 and the filtering module 4;

[0040] The constant current source module 2 is connected to the connected acceleration sensor 5, used to provide a constant current to the acceleration sensor 5 and transmit the measured voltage value to the signal amplification module 3;

[0041] The signal amplification module 3 is connected between the constant current source module 2 and the filtering module 4, amplifies the voltage signal measured by the constant current source module 2 and transmits the amplified signal to the filtering module 4;

[0042] The filtering module 4 is connected to the signal amplification module 3, removes the base current from the amplified signal to convert it into a signal voltage and transmits the signal voltage to the data acquisition card 6.

[0043] In this embodiment, the power supply module 1 includes: a boost circuit 11, a noise reduction circuit 12 and a voltage stabilization circuit 13; wherein,

[0044] The boost circuit 11 is connected to an external power supply interface and is used to increase the input low voltage value;

[0045] The noise reduction circuit 12 is connected to the boost circuit 11, used to eliminate voltage ripples, reduce system noise and improve the measurement accuracy of the system;

[0046] The voltage stabilization circuit 13 is connected to the noise reduction circuit 12 and is used to stabilize the voltage at a fixed value.

[0047] In this embodiment, the boost circuit 11 includes: a DC-DC converter U0, an input capacitor C1, an output capacitor C2, a voltage regulating resistor R1 and a voltage regulating resistor R2; the input capacitor C1 is connected to an external power supply V1; the input end of the DC-DC converter U0 is connected in parallel with the input capacitor C1; the voltage regulating resistors R1 and R2 are connected in series and then connected in parallel with the output capacitor C2 and are also connected in parallel with the output end of the DC-DC converter U0; the input capacitor C1 is directly connected to the external power supply and is used to reduce the influence of AC signals in the power supply on the circuit; the DC-DC converter U0 is connected to the input capacitor C1 and is used to amplify the input voltage, and the voltage amplification multiple is related to the values of the voltage regulating resistor R1 and the voltage regulating resistor R2; the output capacitor C2 is connected to the output end of the DC-DC converter U0 and is used to reduce the influence of voltage ripples on the circuit; the voltage regulating resistors R1 and R2 are connected to the output end of the DC-DC converter U0 and are used to adjust the output voltage value.

[0048] In this embodiment, the noise reduction circuit 12 includes: a triode Q1, a resistor R3, and a capacitor C3; the current limiting resistor R3 is connected to the collector and the base of the triode Q1 and is connected to the output of the boost circuit 1111; the noise reduction capacitor C3 is connected between the base of the triode Q1 and the ground; the collector of the triode Q1 is connected to the output of the boost circuit 11, and is used to amplify the relatively small capacitor C3 to eliminate voltage ripple; the resistor R3 is connected between the emitter and the base of the triode Q1 and is used to maintain the emitter junction current of the triode in the amplification range; the capacitor C3 is connected between the triode Q1 and the ground and is used to eliminate voltage ripple.

[0049] In this embodiment, the voltage stabilizing circuit 13 includes: an integrated voltage regulator U1, a voltage regulating resistor R4, and a voltage regulating resistor R5; the input end of the integrated voltage regulator U1 is connected to the output of the noise reduction circuit 12, and the voltage regulating terminal of the integrated voltage regulator U1 is connected to the voltage regulating resistor R4 and the voltage regulating resistor R5; the voltage regulating resistor R4 and the voltage regulating resistor R5 are connected in series between the output terminal of the integrated voltage regulator U1 and the ground. The integrated voltage regulator U1 is connected to the noise reduction circuit 12 and functions as an integrated three-stage voltage regulator with a variable output voltage, which is obtained by adjusting the voltage regulating resistors R4 and R5; the voltage regulating resistor R4 and the voltage regulating resistor R5 are connected to the integrated voltage regulator U1, and the output voltage value can be adjusted by adjusting the ratio of the voltage regulating resistor R4 to the voltage regulating resistor R5.

[0050] In this embodiment, the power supply module 1 has high power efficiency and can be applied to different power supply voltage values. The output voltage value of the power supply module 1 can be realized by the voltage regulating resistors R1 and R2, or by adjusting the voltage regulating resistors R4 and R5.

[0051] In this embodiment, the constant current source module 2 includes: a voltage reference 21, a differential amplifier U2, an operational amplifier U3, and an output regulating resistor R7. The voltage reference includes: a micro-power voltage reference tube D1 and a current limiting resistor R6; the micro-power voltage reference tube D1 and the current limiting resistor R6 are connected in series and then connected to the output of the power supply module 1. The two input terminals of the differential amplifier U2 are connected in parallel to the micro-power voltage reference tube D1; the output terminal of the operational amplifier U3 is connected to one input terminal and is connected to the reference terminal of the differential amplifier U2, and the other input terminal is connected to the output regulating resistor R7 and then connected to the output terminal and the measuring terminal of the differential amplifier U2; the connection point of the operational amplifier U3 and the output regulating resistor R7 is the constant current source output terminal, and the constant current source output terminal is connected to the acceleration sensor 5, and the current magnitude is denoted as I sen , and the voltage magnitude is denoted as V sen . The voltage reference 21 is connected to the output of the power supply module 1 to obtain a stable voltage value u i to the differential amplifier to obtain the desired constant current source value. The connection manner of the differential amplifier and the operational amplifier is as Figure 1As shown, it constitutes the core part of the constant current source, achieving a constant output size of the constant current source, which does not change with the change of the load impedance. The output current I of the constant current source sen is related to the magnitude of the input voltage value u i and the output adjustment resistor R7.

[0052] In this embodiment, the current value output by the constant current source module 2 is adjustable, and its magnitude is equal to the ratio of the voltage input to the differential amplifier U2 to the output adjustment resistor R7. Therefore, the magnitude of the current output by the current source can be adjusted by changing the magnitude of the output adjustment resistor R7.

[0053] In this embodiment, the signal amplification module 3 includes: a filter resistor R8, a filter capacitor C4, an operational amplifier U4, an operational amplifier U5, a gain adjustment resistor R9, a gain adjustment resistor R10, and a gain selection switch K1; the power supplies of the operational amplifier U4 and the operational amplifier U5 are connected to the output end of the power supply module 1. The non-inverting input end of the operational amplifier U4 is connected to the non-inverting input end of the operational amplifier U5 through the resistor R8. The output end of the operational amplifier U4 is connected to the output end of the operational amplifier U5 through the gain adjustment resistor R9 and the gain adjustment resistor R10; the gain adjustment resistor R9 is connected between the inverting input end and the output end of the operational amplifier U4; the inverting input end and the output end of the operational amplifier U5 are connected and then connected to the gain adjustment resistor R10; the filter capacitor C4 is connected between the non-inverting input end of the operational amplifier U4 and the ground; the gain selection switch K1 is connected in parallel with the gain adjustment resistor R9; the input end of the operational amplifier U4 is connected to the output end of the constant current source, and the output end of the operational amplifier U4 is the amplified signal. The filter resistor R8 and the filter capacitor C4 are connected to the operational amplifier U5 to form a low-pass filter circuit; the operational amplifier U4 is connected to the low-pass filter circuit composed of the filter resistor R8 and the filter capacitor C4 to form a voltage follower, which is used to provide a reference voltage for the subsequent signal amplification circuit to avoid amplifying the base current conversion voltage. The two input ends of the operational amplifier U4 are respectively connected to the output of the constant current source end and the filter resistor R8 and the filter capacitor C4 to increase the driving ability of the input signal; the operational amplifier U5 is connected to the filter resistor R8 and the filter capacitor C4, and the output end is connected to the two gain adjustment resistors R9 and R10 to form a signal amplifier to amplify the measured voltage signal. The gain coefficient is related to the gain adjustment resistor R9 and the gain adjustment resistor R10; the gain selection switch K1 is connected in parallel with the gain adjustment resistor R9, and its function is to adjust the gain coefficient of the amplification circuit to control the gain gear. The amplification factor of the signal amplifier is controlled by the gain selection switch K1. When the gain selection switch K1 is closed, the gain multiple is 1. When the switch is open, the gain is greater than 1, and the gain multiple is determined by the ratio of the two gain adjustment resistors.

[0054] In this embodiment, the filtering module 4 includes a coupling capacitor C5 and a resistor R11. The coupling capacitor C5 is connected to the output terminal of the operational amplifier U4 and the resistor R11. The connection of the coupling capacitor C5 and the resistor R11 is connected to the external data acquisition card 6. The data acquisition card 6 digitally converts the measurement signal and is connected to the host computer 7 through the USB cable 8. The coupling capacitor C5 functions to isolate the DC signal in the previous-stage circuit.

[0055] The present invention eliminates the voltage ripple of the power supply through the noise reduction circuit, realizes reducing the influence of the system noise on the detection result while being powered by a power supply with strong noise, and improves the accuracy and robustness of the system measurement. In addition, the adopted noise reduction circuit avoids the problem of increasing the circuit area caused by increasing the capacitance, reduces the volume of the system, and the overall system has the characteristic of miniaturization. The boost circuit of the present invention adopts low-power components such as a small-sized and low-power boost DC-DC converter, a micro-power differential amplifier, and an operational amplifier. The overall design of the system has the advantages of low power consumption and high power efficiency. In addition, when the voltage value of the external power supply changes, only the size of the output adjustment resistor in the boost circuit needs to be adjusted to make the output voltage of the power supply module meet the requirements of other circuits. Therefore, the present invention also has high flexibility.

[0056] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts between the various embodiments, reference can be made to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and reference can be made to the description in the method part for the relevant parts.

[0057] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A signal conditioner for an impact stress wave system, characterized in that, Including: A power supply module, a constant current source module, a signal amplification module, and a filtering module; wherein, The power supply module is used to convert the input voltage into the voltage required by the system and supply power to the constant current source module, the signal amplification module, and the filtering module; The constant current source module is connected to the connected acceleration sensor, used to provide a constant current to the acceleration sensor, and transmit the measured voltage value to the signal amplification module; The signal amplification module is connected between the constant current source module and the filtering module, amplifies the voltage signal measured by the constant current source module, and transmits the amplified signal to the filtering module; The filtering module is connected to the signal amplification module, removes the base current from the amplified signal to convert it into a signal voltage, and transmits the signal voltage to the data acquisition card; The power supply module includes: a boost circuit, a noise reduction circuit, and a voltage stabilization circuit; wherein, The boost circuit is connected to an external power supply interface; The noise reduction circuit is connected to the boost circuit and includes: a triode Q1, a resistor R3, and a capacitor C3; the collector of the triode Q1 is connected to the output of the boost circuit, used to amplify the relatively small capacitor C3 to eliminate voltage ripple; the resistor R3 is connected between the emitter and the base of the triode Q1, used to maintain the emitter junction current of the triode within the amplification range; the capacitor C3 is connected between the triode Q1 and the ground, used to eliminate voltage ripple; The voltage stabilization circuit is connected to the noise reduction circuit; The constant current source module includes: a voltage reference, a differential amplifier U2, an operational amplifier U3, and an output adjustment resistor R7; the two input terminals of the differential amplifier U2 are connected to the voltage reference; the output terminal of the operational amplifier U3 is connected to one input terminal and is also connected to the reference terminal of the differential amplifier U2, and the other input terminal is connected to the output adjustment resistor R7 and then connected to the output terminal and the measurement terminal of the differential amplifier U2; the connection point of the operational amplifier U3 and the output adjustment resistor R7 is the constant current source output terminal, and the constant current source output terminal is connected to the acceleration sensor.

2. The signal conditioner for an impact stress wave system according to claim 1, wherein The boost circuit includes: a DC-DC converter U0, an input capacitor C1, an output capacitor C2, a voltage adjustment resistor R1, and a voltage adjustment resistor R2; The input capacitor C1 is directly connected to the external power supply, used to reduce the influence of AC signals in the power supply on the circuit; The DC-DC converter U0 is connected to the input capacitor C1, used to amplify the input voltage; The output capacitor C2 is connected to the output terminal of the DC-DC converter U0, used to reduce the influence of voltage ripple on the circuit; The voltage adjustment resistor R1 and the voltage adjustment resistor R2 are connected to the output terminal of the DC-DC converter U0, used to adjust the output voltage value.

3. A signal conditioner for an impact stress wave system according to claim 1, characterized in that, The voltage stabilization circuit includes: an integrated voltage regulator U1, a voltage adjustment resistor R4, and a voltage adjustment resistor R5; the input terminal of the integrated voltage regulator U1 is connected to the output of the noise reduction circuit, the voltage adjustment terminal of the integrated voltage regulator U1 is connected to the voltage adjustment resistor R4 and the voltage adjustment resistor R5; the voltage adjustment resistor R4 and the voltage adjustment resistor R5 are connected in series between the output terminal of the integrated voltage regulator U1 and the ground.

4. A signal conditioner for an impact stress wave system according to claim 1, characterized in that, The voltage reference includes: a micro-power voltage reference diode D1 and a current-limiting resistor R6; the micro-power voltage reference diode D1 is connected in series with the current-limiting resistor R6 and then connected to the output of the power supply module.

5. A signal conditioner for an impact stress wave system according to claim 1, characterized in that, The signal amplification module includes: a filtering resistor R8, a filtering capacitor C4, operational amplifiers U4 and U5, gain adjustment resistors R9 and R10, and a gain selection switch K1; the power supplies of the operational amplifiers U4 and U5 are connected to the output terminal of the power supply module, the non-inverting input terminal of the operational amplifier U4 is connected to the non-inverting input terminal of the operational amplifier U5 through the resistor R8, the output terminal of the operational amplifier U4 is connected to the output terminal of the operational amplifier U5 through the gain adjustment resistor R9 and the gain adjustment resistor R10; the gain adjustment resistor R9 is connected between the inverting input terminal and the output terminal of the operational amplifier U4; the inverting input terminal and the output terminal of the operational amplifier U5 are connected and then connected to the gain adjustment resistor R10; the filtering capacitor C4 is connected between the non-inverting input terminal of the operational amplifier U4 and the ground; the gain selection switch K1 is connected in parallel with the gain adjustment resistor R9; the input terminal of the operational amplifier U4 is connected to the output terminal of the constant current source, and the output terminal of the operational amplifier U4 is the amplified signal.

6. The signal conditioner for an impact stress wave system according to claim 1, characterized in that, The filtering module includes: a coupling capacitor C5 and a resistor R11; the coupling capacitor C5 is connected between the output terminal of the operational amplifier U4 and the resistor R11; the connection of the coupling capacitor C5 and the resistor R11 is connected to an external data acquisition card; the data acquisition card digitally converts the measured signal and then connects to the upper computer through a USB cable.

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