Acoustic emission waveform acquisition and processing device

Abstract

The utility model belongs to the technical field of acoustic emission waveform acquisition and processing, and particularly relates to an acoustic emission waveform acquisition and processing device which comprises an acquisition module, the acquisition module comprises a signal conditioning unit, an analog-to-digital converter and a communication interface which are connected in sequence, and the signal conditioning unit comprises a signal acquisition device and an acoustic emission filter which are connected with each other. The acoustic emission filter comprises a continuous time filter, and four cascaded second-order filters are arranged in the continuous time filter; therefore, the continuous time filter can directly achieve filtering of ultrasonic signals, the size is reduced, the circuit design is simplified, the PCB layout and wiring complexity is reduced, and meanwhile higher filtering precision and lower noise are achieved. And the signal collector is matched to collect ultrasonic signals, the analog-to-digital converter converts the ultrasonic signals into digital signals, and the digital signals are output through the communication interface, so that acoustic emission waveform collection and processing with lower cost and higher efficiency are realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to acoustic emission waveform collection and processing technical field, specifically relates to a kind of acoustic emission waveform collection processing device. BACKGROUND

[0002] In acoustic emission signal collection, acoustic emission waveform collection processing device needs to complete the collection of ultrasonic signal, filtering, analog-digital conversion and the output of digital signal, finally realizes digital signal processing, data storage and external data interaction.

[0003] In the prior art, the traditional acoustic emission waveform collection processing device realizes the filtering of ultrasonic signal by a multi-channel ultrasonic signal filter, which is generally implemented by using operational amplifiers, high-precision resistors and capacitors and other discrete components on a circuit board, or a single-chip filter with a clock. In order to realize the filtering of ultrasonic signals with a frequency of 30KHz-200KHz and obtain a narrower transition band and a flatter passband, more amplifiers, resistors, capacitors and clock chips are often required, which not only occupies a large volume and limits the layout and wiring on the limited circuit board space, but also requires higher precision of resistors, capacitors and other components, resulting in higher cost and less flexible configuration of the device. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the defects of the acoustic emission waveform collection processing filter in the prior art, which requires more discrete components on the circuit board, resulting in a large volume and high cost, so as to provide an acoustic emission waveform collection processing device.

[0005] An acoustic emission waveform collection processing device includes a collection module.

[0006] The collection module includes a signal conditioning unit, an analog-to-digital converter and a communication interface connected in sequence, the signal conditioning unit includes a signal collector and an acoustic emission filter connected to each other, the acoustic emission filter includes a continuous-time filter, the continuous-time filter has four cascaded second-order filters built-in, the signal collector is used to collect ultrasonic signals to form analog signals, the continuous-time filter is used to obtain analog signals to form filtered signals, the analog-to-digital converter is used to obtain filtered signals to form digital signals, and the communication interface is used to output the digital signals.

[0007] Further, the communication interface is a PCIE interface.

[0008] Further, the model of the continuous-time filter is LTC1562.

[0009] Further, the acoustic emission filter further comprises an external resistance and an external capacitance, the external capacitance and the external resistance are connected with the continuous-time filter respectively, so as to set the center frequency and the quality factor of the continuous-time filter.

[0010] Further, in the four cascaded second-order filters built-in the continuous-time filter, the input type of the second-order filter of the first stage is a resistance input type.

[0011] Further, in the four cascaded second-order filters built-in the continuous-time filter, the input type of the second-order filters of the second stage, the third stage and the fourth stage is a resistance and parallel capacitance input type.

[0012] Further, the continuous-time filter is an active filter.

[0013] Beneficial effects: the acoustic emission waveform acquisition processing device provided by the utility model has the advantages of low cost, high efficiency, high filtering precision and low noise. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0015] Figure 1 The overall structure of the present application is shown in the schematic diagram;

[0016] Figure 2 The partial circuit principle diagram of the continuous-time filter connected in the present application is shown in the schematic diagram;

[0017] Figure 3 The partial circuit principle diagram of the continuous-time filter connected in the present application is shown in the schematic diagram;

[0018] Explanation of reference signs: U1, continuous-time filter; U1A, first second-order filter; U1B, second second-order filter; U1C, third second-order filter; U1D, fourth second-order filter; GND A, analog ground;

[0019] R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; R10, tenth resistor; R11, eleventh resistor; R12, twelfth resistor; R13, thirteenth resistor; R14, fourteenth resistor; R15, fifteenth resistor; R16, sixteenth resistor; R17, seventeenth resistor; R18, eighteenth resistor; R19, nineteenth resistor; R20, twentieth resistor;

[0020] C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor; C5, fifth capacitor; C6, sixth capacitor. DETAILED DESCRIPTION

[0021] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without using some or all of these specific details, and that the present application is not limited to the specific embodiments disclosed below.

[0022] In the description of the present application, it should be understood that the terms "first", "second", etc. are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0023] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] Reference Figure 1As shown, the embodiment provides an acoustic emission waveform acquisition processing device, comprising an acquisition module; the acquisition module comprises a signal conditioning unit, an analog-to-digital converter and a communication interface connected in sequence, the signal conditioning unit comprises a signal collector and an acoustic emission filter connected with each other; the acoustic emission filter comprises a continuous time filter, the continuous time filter is built-in four cascaded second-order filters; the signal collector is used to acquire ultrasonic signals to form analog signals; the continuous time filter is used to acquire analog signals to form filtered signals; the analog-to-digital converter is used to acquire filtered signals to form digital signals; and the communication interface is used to output the digital signals.

[0025] The acoustic emission waveform acquisition processing device provided by the embodiment can directly realize filtering of ultrasonic signals, and can realize higher filtering precision and lower noise while reducing the volume, simplifying the circuit design and reducing the complexity of PCB layout and wiring; and the ultrasonic signals are acquired by the signal collector, converted into digital signals by the analog-to-digital converter and output through the communication interface, so that the acoustic emission waveform acquisition processing with lower cost and higher efficiency is realized.

[0026] Specifically, the communication interface is a PCIE interface. The acoustic emission waveform acquisition processing device is connected with a CPU mainboard through the PCIE interface, the CPU mainboard acquires the digital signals and completes digital signal processing, data storage and external data interaction.

[0027] As a further improvement of the embodiment, the communication interface further comprises an RS232 interface, and the CPU mainboard sends a control signal to the acoustic emission waveform acquisition processing device through the RS232 interface.

[0028] As a preferred embodiment, the model of the continuous time filter is LTC1562. In the embodiment, the continuous time filter has rail-to-rail input and output, and does not need an external clock, and provides low noise and low distortion filtering.

[0029] In the embodiment, the acoustic emission filter further comprises an external resistor and an external capacitor, the external capacitor and the external resistor are connected with the continuous time filter respectively, and are used to set the center frequency and the quality factor of the continuous time filter.

[0030] Specifically, the input type of the second-order filter of the first stage in the four cascaded second-order filters of the continuous-time filter is a resistance input type. The input type of the second-order filters of the second stage, the third stage and the fourth stage in the four cascaded second-order filters of the continuous-time filter is a resistance and capacitance parallel input type. The arrangement of the four cascaded second-order filters can effectively improve the stability of the filter and reduce the noise between stages. The four groups of cascaded modes increase the filter order while enhancing the filtering effect. The parameter values of elements such as R and C can be determined by filterlab, and finally the target filter can be designed by adjusting the parameters.

[0031] Referring to Figure 2 and Figure 3 Specifically, in the present embodiment, the four cascaded second-order filters of the continuous-time filter U1 are the first second-order filter U1A, the second second-order filter U1B, the third second-order filter U1C and the fourth second-order filter U1D. The external resistors include the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16, the seventeenth resistor R17, the eighteenth resistor R18, the nineteenth resistor R19 and the twentieth resistor R20. The external capacitors include the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4.

[0032] The first second-order filter U1A includes an INVA terminal, a V1A terminal and a V2A terminal. The second second-order filter U1B includes an INVB terminal, a V1B terminal and a V2B terminal. The third second-order filter U1C includes an INVC terminal, a V1C terminal and a V2C terminal. The fourth second-order filter U1D includes an INVD terminal, a V1D terminal and a V2D terminal.

[0033] The first resistor R1 is connected between the input terminal FILTER_IN of the cascade filter and the INVB terminal; the second resistor R2 is connected between the INVB terminal and the V1B terminal; the third resistor R3 is connected between the V2B terminal and the INVA terminal; the fourth resistor R4 is connected in parallel with the sixth resistor R6 between the INVA terminal and the V1A terminal; the fifth resistor R5 is connected in parallel with the seventh resistor R7 between the V2A terminal and the INVD terminal; the eighth resistor R8 is connected between the INVB terminal and the V2B terminal; the ninth resistor R9 is connected in parallel with the tenth resistor R10 between the INVA terminal and the V2A terminal; the eleventh resistor R11 is connected between the INVD terminal and the V1D terminal; the twelfth resistor R12 is connected in series with the thirteenth resistor R13 between the V2D terminal and the INVC terminal; the fourteenth resistor R14 is connected in parallel with the sixteenth resistor R16 between the INVC terminal and the V1C terminal; the fifteenth resistor R15 is connected in parallel with the seventeenth resistor R17 between the V2C terminal and the output terminal FILTER_OUT of the cascade filter; the eighteenth resistor R18 is connected between the INVD terminal and the V2D terminal; the nineteenth resistor R19 is connected in series with the twentieth resistor R20 between the INVC terminal and the V2C terminal; the first capacitor C1 is connected between the V1B terminal and the INVA terminal; the second capacitor C2 is connected between the V1A terminal and the INVD terminal; the third capacitor C3 is connected between the V1D terminal and the INVC terminal; the fourth capacitor C4 is connected between the V1C terminal and the output terminal FILTER_OUT of the cascade filter; the continuous-time filter U1 further comprises a V+ terminal, a V- terminal, a SHDN terminal, an AGND terminal, a VA- terminal, a VB- terminal, a VC- terminal, a VD- terminal; the V+ terminal is connected to a +5V analog DC source +5VA and is connected to an analog ground GND A through a fifth capacitor C5; the V- terminal, the VA- terminal, the VB- terminal, the VC- terminal, the VD- terminal are connected to a -5V analog DC source -5VA and are connected to the analog ground GND A through a sixth capacitor C6; the SHDN terminal and the AGND terminal are connected to the analog ground GND A.

[0034] As the preferred of the embodiment, the resistance values of the external resistances: the first resistance R1, the second resistance R2, the third resistance R3, the fourth resistance R4, the fifth resistance R5, the sixth resistance R6, the seventh resistance R7, the eighth resistance R8, the ninth resistance R9, the tenth resistance R10, the eleventh resistance R11, the twelfth resistance R12, the thirteenth resistance R13, the fourteenth resistance R14, the fifteenth resistance R15, the sixteenth resistance R16, the seventeenth resistance R17, the eighteenth resistance R18, the nineteenth resistance R19, the twentieth resistance R20 are respectively: 200K, 36K, 750K, 51K, 7.5K, 51K, 100K, 200K, 7.5K, 150K, 10K, 68K, 1M, 430K, 24K, 430K, 430K, 15K, 220K, 200K; the capacitance values of the external capacitors: the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6 are respectively: 680p, 8.2p, 100p, 12p, 100n, 100n.

[0035] In the embodiment, the continuous-time filter is an active filter.

[0036] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0037] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as the limitation of the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An acoustic emission waveform acquisition and processing device, characterized in that, The acquisition module comprises a signal conditioning unit, an analog-to-digital converter and a communication interface connected in sequence, the signal conditioning unit comprises a signal collector and an acoustic emission filter connected with each other, the acoustic emission filter comprises a continuous-time filter, the continuous-time filter is built-in with four cascaded second-order filters, the signal collector is used to acquire an ultrasonic signal to form an analog signal, the continuous-time filter is used to acquire the analog signal to form a filtered signal, the analog-to-digital converter is used to acquire the filtered signal to form a digital signal, and the communication interface is used to output the digital signal. The communication interface is a PCIE interface.

2. The acoustic emission waveform acquisition processing apparatus according to claim 1, wherein The continuous-time filter is an LTC1562.

3. The acoustic emission waveform acquisition and processing apparatus according to claim 1, wherein The acoustic emission filter further comprises an external resistor and an external capacitor, the external capacitor and the external resistor are connected with the continuous-time filter respectively, and are used to set a center frequency and a quality factor of the continuous-time filter.

4. The acoustic emission waveform acquisition and processing apparatus according to claim 1, wherein In the four cascaded second-order filters built-in in the continuous-time filter, the input type of the second-order filter of the first stage is a resistance input type.

5. The acoustic emission waveform acquisition and processing apparatus according to claim 1, wherein In the four cascaded second-order filters built-in in the continuous-time filter, the input type of the second-order filters of the second stage, the third stage and the fourth stage is a resistance-parallel-capacitance input type.

6. The acoustic emission waveform acquisition and processing apparatus according to claim 1, wherein The continuous-time filter is an active filter.

7. The acoustic emission waveform acquisition and processing apparatus according to claim 1, wherein ​

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