A pipeline leak detection device and a pipeline leak detection method

Abstract

This invention belongs to the field of pipeline detection technology, specifically relating to a pipeline leak detection device and method. The pipeline leak detection device includes: a reference power supply module, a first-stage amplifier circuit module, and a second-stage amplifier circuit module; wherein the reference power supply module, the first-stage amplifier circuit module, and the second-stage amplifier circuit module are connected sequentially; the reference power supply module outputs a reference voltage to the first-stage amplifier circuit module; the first-stage amplifier circuit module receives the reference voltage signal and a piezoelectric signal to select and amplify the characteristic frequency band of the piezoelectric signal; and the second-stage amplifier circuit module amplifies the characteristic frequency band a second time. This invention, by using a reference power supply module in conjunction with a first-stage amplifier circuit module to select and amplify the characteristic frequency band of the piezoelectric signal, can detect leak signals over long distances, while simultaneously overcoming environmental noise interference and improving detection accuracy.

Description

Technical Field

[0001] This invention belongs to the field of pipeline detection technology, specifically relating to a pipeline leak detection device and a pipeline leak detection method. Background Technology

[0002] The existing technology for monitoring pipeline leaks involves pre-installing detection sensors on the pipeline. When a leak occurs, the leakage vibration signal is transmitted along the pipeline and can be detected by the nearby detection sensors.

[0003] However, the pipe vibration caused by leakage is a tiny signal. A common method for obtaining such a small signal is to amplify the piezoelectric signal acquired by the piezoelectric sensor before analysis and processing. However, the vibration signal of plastic pipes attenuates relatively quickly during transmission. Using the above signal processing method, the leakage signal will soon be drowned out by the environmental noise, severely limiting the distance at which the piezoelectric sensor can detect the leakage.

[0004] Therefore, there is an urgent need to develop a new pipeline leak detection device and method to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a pipeline leak detection device and a pipeline leak detection method.

[0006] To address the aforementioned technical problems, this invention provides a pipeline leak detection device, comprising: a reference power supply module, a first-stage amplifier circuit module, and a second-stage amplifier circuit module; wherein the reference power supply module, the first-stage amplifier circuit module, and the second-stage amplifier circuit module are connected in sequence; the reference power supply module outputs a reference voltage to the first-stage amplifier circuit module; the first-stage amplifier circuit module receives the reference voltage signal and a piezoelectric signal to select and amplify the characteristic frequency band of the piezoelectric signal; and the second-stage amplifier circuit module amplifies the characteristic frequency band a second time.

[0007] Specifically, the reference power supply module includes: a first voltage divider resistor, a second voltage divider resistor, and a first voltage follower; the power supply terminal divides the voltage signal through the first voltage divider resistor and the second voltage divider resistor and sends it to the first voltage follower, so that the first voltage follower outputs a reference voltage to the first stage amplifier circuit module.

[0008] Specifically, the first-stage amplifier circuit module includes: a third adjustable resistor, a second capacitor, a fourth adjustable resistor, a third capacitor, and a first amplifier; the third adjustable resistor is connected in series with the second capacitor and is connected to the piezoelectric signal input terminal; the fourth adjustable resistor is connected in parallel with the third capacitor, one end of the fourth adjustable resistor and the third capacitor being connected to the negative input terminal of the second capacitor and the first amplifier, and the other end of the fourth adjustable resistor and the third capacitor being connected to the output terminal of the first amplifier; the positive input terminal of the first amplifier is connected to the output terminal of the first voltage follower; the third adjustable resistor, the second capacitor, the fourth adjustable resistor, and the third capacitor perform closed-loop adjustment of the first amplifier so that the first amplifier selects and amplifies the characteristic frequency range of the piezoelectric signal.

[0009] Specifically, the piezoelectric signal input terminal is a piezoelectric ceramic.

[0010] Specifically, the capacitance value of the second capacitor is equal to the capacitance value of the third capacitor, and the resistance value of the third adjustable resistor is equal to the resistance value of the fourth adjustable resistor.

[0011] Specifically, the resistance values ​​of the third and fourth adjustable resistors are adjusted synchronously to select the corresponding characteristic frequency range.

[0012] Specifically, the characteristic frequency is 1 / (2 π *The resistance value of the third adjustable resistor*The capacitance value of the second capacitor) or 1 / (2 π *The resistance value of the fourth adjustable resistor* *The capacitance value of the third capacitor*.

[0013] Specifically, the secondary amplifier circuit module includes: a non-inverting closed-loop amplifier circuit; a second amplifier is provided in the non-inverting closed-loop amplifier circuit, and the positive input terminal of the second amplifier is connected to the output terminal of the first amplifier; the second amplifier amplifies the characteristic frequency band twice before outputting it.

[0014] On the other hand, the present invention provides a pipeline leakage detection method, which includes: sampling a piezoelectric signal and obtaining a reference voltage; selecting a characteristic frequency band of the piezoelectric signal and amplifying it.

[0015] Specifically, the pipeline leak detection method is suitable for use with the pipeline leak detection device described above.

[0016] The beneficial effects of this invention are that by using a reference power supply module in conjunction with a first-stage amplifier circuit module to select and amplify the characteristic frequency range of the piezoelectric signal, it is possible to detect leakage signals over long distances, while simultaneously overcoming environmental noise interference and improving detection accuracy.

[0017] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a circuit diagram of the pipeline leak detection device of the present invention;

[0021] Figure 2 This is a flowchart of the pipeline leak detection method of the present invention.

[0022] In the picture:

[0023] 1. Reference power supply module; 2. First-stage amplifier circuit module; 3. Second-stage amplifier circuit module;

[0024] R1, first voltage divider resistor; R2, second voltage divider resistor; U1A, first voltage follower; R3, third adjustable resistor; C2, second capacitor; R4, fourth adjustable resistor; C3, third capacitor; U1B, first amplifier; U2A, second amplifier; P1, piezoelectric signal input terminal. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1, in this example, as Figure 1As shown, this embodiment provides a pipeline leak detection device, which includes: a reference power supply module 1, a first-stage amplifier circuit module 2, and a second-stage amplifier circuit module 3; wherein the reference power supply module 1, the first-stage amplifier circuit module 2, and the second-stage amplifier circuit module 3 are connected in sequence; the reference power supply module 1 outputs a reference voltage to the first-stage amplifier circuit module 2; the first-stage amplifier circuit module 2 receives the reference voltage signal and the piezoelectric signal to select the characteristic frequency band of the piezoelectric signal and amplify it; and the second-stage amplifier circuit module 3 amplifies the characteristic frequency band a second time.

[0027] In this embodiment, the reference power supply module 1, together with the first-stage amplifier circuit module 2, selects and amplifies the characteristic frequency range of the piezoelectric signal, which can detect leakage signals at a longer distance, while overcoming environmental noise interference and improving detection accuracy.

[0028] In order to output a reference voltage, the reference power supply module 1 includes: a first voltage divider resistor R1, a second voltage divider resistor R2, and a first voltage follower U1A; the power supply terminal divides the voltage signal through the first voltage divider resistor R1 and the second voltage divider resistor R2 and sends it to the first voltage follower U1A, so that the first voltage follower U1A outputs a reference voltage to the first stage amplifier circuit module 2.

[0029] Specifically, the first voltage divider resistor R1 and the second voltage divider resistor R2 are used to distribute the power supply VCC, and after passing through the first voltage follower U1A, output the reference voltage J1, which serves as the input of the first-stage amplifier circuit module 2.

[0030] To achieve frequency selection and amplification, the first-stage amplifier circuit module 2 includes: a third adjustable resistor R3, a second capacitor C2, a fourth adjustable resistor R4, a third capacitor C3, and a first amplifier U1B; the third adjustable resistor R3 is connected in series with the second capacitor C2, and the third adjustable resistor R3 is connected to the piezoelectric signal input terminal P1; the fourth adjustable resistor R4 is connected in parallel with the third capacitor C3, one end of the fourth adjustable resistor R4 and the third capacitor C3 being connected to the negative input terminal of the second capacitor C2 and the first amplifier U1B, and the other end of the fourth adjustable resistor R4 and the third capacitor C3 being connected to the output terminal of the first amplifier U1B; the positive input terminal of the first amplifier U1B is connected to the output terminal of the first voltage follower U1A; the third adjustable resistor R3, the second capacitor C2, the fourth adjustable resistor R4, and the third capacitor C3 provide closed-loop adjustment for the first amplifier U1B, so that the first amplifier U1B selects and amplifies the characteristic frequency range of the piezoelectric signal.

[0031] As an optional method for acquiring piezoelectric signals, the piezoelectric signal input terminal P1 is a piezoelectric ceramic.

[0032] To ensure the maximum gain of the first amplifier U1B, the capacitance value of the second capacitor C2 is equal to that of the third capacitor C3, and the resistance value of the third adjustable resistor R3 is equal to that of the fourth adjustable resistor R4.

[0033] Specifically, the piezoelectric signal is input to the first amplifier U1B and output from terminal J2. The frequency f of the piezoelectric signal output by the first amplifier U1B is within 1 / (2πf). π *R3*C2)=1 / (2 π When *R4*C3), the gain is at its maximum at this frequency, thus ensuring the amplification gain and stability of the first amplifier U1B.

[0034] In this embodiment, the resistance values ​​of the third adjustable resistor R3 and the fourth adjustable resistor R4 are adjusted synchronously to select the corresponding characteristic frequency range.

[0035] In this embodiment, low-frequency signals attenuate more slowly than high-frequency signals in the pipe, but they are drowned out by ambient noise. Amplifying the low-frequency band of the picked-up piezoelectric signal can reveal the characteristics of the leakage signal. Based on the frequency characteristics of the leakage signal in the plastic pipe, the circuit selects the capacitance value of the second capacitor C2 to be equal to that of the third capacitor C3. By synchronously adjusting the resistance values ​​of the third adjustable resistor R3 and the fourth adjustable resistor R4, the corresponding amplification frequency band is obtained, enabling the detection of leakage signals at a relatively long distance.

[0036] In this embodiment, the characteristic frequency is 1 / (2 π *The resistance value of the third adjustable resistor*The capacitance value of the second capacitor) or 1 / (2 π *The resistance value of the fourth adjustable resistor* *The capacitance value of the third capacitor*.

[0037] Specifically, by adjusting the initial resistance value of the third adjustable resistor R3 to its final resistance value, or the initial resistance value of the fourth adjustable resistor R4 to its final resistance value, the corresponding characteristic frequency range can be obtained.

[0038] In this embodiment, the secondary amplifier circuit module 3 includes: a non-inverting closed-loop amplifier circuit; a second amplifier U2A is provided in the non-inverting closed-loop amplifier circuit, and the positive input terminal of the second amplifier U2A is connected to the output terminal of the first amplifier U1B; the second amplifier U2A amplifies the characteristic frequency band twice before outputting it.

[0039] Specifically, the piezoelectric signal output by the first amplifier U1B is input to the second amplifier U2A after being divided by the fifth resistor R5 and the sixth resistor R6. At the same time, the output of the second amplifier U2A is ((the resistance value of the eighth resistor R8 / the resistance value of the seventh resistor R7) + 1) * (the voltage of the piezoelectric signal after being divided by the fifth resistor R5 and the sixth resistor R6).

[0040] In this embodiment, the secondary amplifier circuit module 3 further amplifies the J2 signal and outputs P2, thereby further amplifying the signal's distinguishability and facilitating subsequent signal separation processing.

[0041] Example 2, based on Example 1, such as Figures 1 to 2 As shown, this embodiment provides a pipeline leakage detection method, which includes: sampling piezoelectric signals and obtaining a reference voltage; selecting the characteristic frequency band of the piezoelectric signal and amplifying it.

[0042] Specifically, the pipeline leak detection method is suitable for use with the pipeline leak detection device provided in Example 1.

[0043] In summary, this invention selects and amplifies the characteristic frequency range of the piezoelectric signal by using a reference power supply module in conjunction with a first-stage amplifier circuit module, enabling the detection of leakage signals over long distances while overcoming environmental noise interference and improving detection accuracy.

[0044] All the devices selected in this application (parts whose specific structures are not specified) are general standard parts or parts known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0045] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0046] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0048] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0049] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0050] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A pipeline leak detection device, characterized in that, include: Reference power supply module, first-stage amplifier circuit module, and second-stage amplifier circuit module; in The reference power supply module, the first-stage amplifier circuit module, and the second-stage amplifier circuit module are connected in sequence. The reference power supply module outputs a reference voltage to the first-stage amplifier circuit module; The first-stage amplifier circuit module receives a reference voltage signal and a piezoelectric signal to select the characteristic frequency band of the piezoelectric signal and amplify it. as well as The secondary amplifier circuit module amplifies the characteristic frequency band a second time; The reference power supply module includes: a first voltage divider resistor, a second voltage divider resistor, and a first voltage follower; The voltage signal is divided by the first voltage divider resistor and the second voltage divider resistor at the power supply terminal and sent to the first voltage follower, so that the first voltage follower outputs a reference voltage to the first stage amplifier circuit module. The first-stage amplifier circuit module includes: a third adjustable resistor, a second capacitor, a fourth adjustable resistor, a third capacitor, and a first amplifier; The third adjustable resistor is connected in series with the second capacitor, and the third adjustable resistor is connected to the piezoelectric signal input terminal; The fourth adjustable resistor is connected in parallel with the third capacitor. One end of the fourth adjustable resistor and the third capacitor connected in parallel is connected to the second capacitor and the negative input terminal of the first amplifier. The other end of the fourth adjustable resistor and the third capacitor connected in parallel is connected to the output terminal of the first amplifier. The positive input terminal of the first amplifier is connected to the output terminal of the first voltage follower; The third adjustable resistor, the second capacitor, the fourth adjustable resistor, and the third capacitor perform closed-loop adjustment on the first amplifier so that the first amplifier selects and amplifies the characteristic frequency range of the piezoelectric signal.

2. The pipeline leak detection device as described in claim 1, characterized in that, The piezoelectric signal input terminal is a piezoelectric ceramic.

3. The pipeline leak detection device as described in claim 1, characterized in that, The capacitance value of the second capacitor is equal to the capacitance value of the third capacitor, and the resistance value of the third adjustable resistor is equal to the resistance value of the fourth adjustable resistor.

4. The pipeline leak detection device as described in claim 3, characterized in that, The resistance values ​​of the third and fourth adjustable resistors are adjusted synchronously to select the corresponding characteristic frequency range.

5. The pipeline leak detection device as described in claim 4, characterized in that, The characteristic frequency is 1 / (2 π *The resistance value of the third adjustable resistor*The capacitance value of the second capacitor) or 1 / (2 π *The resistance value of the fourth adjustable resistor* *The capacitance value of the third capacitor*.

6. The pipeline leak detection device as described in claim 1, characterized in that, The secondary amplifier circuit module includes: a non-inverting closed-loop amplifier circuit; The non-inverting closed-loop amplifier circuit includes a second amplifier, the positive input terminal of which is connected to the output terminal of the first amplifier. The second amplifier amplifies the characteristic frequency band twice before outputting the signal.

7. A pipeline leak detection method using the pipeline leak detection device as described in any one of claims 1-6, characterized in that, include: Sample piezoelectric signals and obtain reference voltage; Select the characteristic frequency range of the piezoelectric signal and amplify it.

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