Full-diameter bisection rock core nondestructive acoustic detection method and device based on laser ultrasound

Abstract

The invention belongs to the field of petrophysics and geophysical exploration, and relates to a full-diameter bisection rock core nondestructive acoustic detection method and device based on laser ultrasound, electronic equipment and a computer readable storage medium. Comprising the following steps that 1, pulse laser is irradiated to a laser ultrasonic excitation point through a lens, an ultrasonic signal is excited, and the ultrasonic signal is transmitted to an ultrasonic receiving point; 2, receiving an ultrasonic signal of the ultrasonic receiving point position through an ultrasonic probe, and outputting an electric signal; 3, electric signals of different laser ultrasonic excitation point positions are collected and output to a processing module; and step 4, amplifying and filtering the electric signals of different laser ultrasonic excitation point positions to improve the signal-to-noise ratio, analyzing the signals after the signal-to-noise ratio is improved, and finally obtaining full-diameter bisection core information. According to the invention, core surface positioning ultrasonic excitation is realized by using laser, the problem of poor coupling of a core cambered surface and an ultrasonic probe is solved, and the detection efficiency and accuracy are improved.

Description

Technical Field

[0001] The present invention belongs to the field of rock physics and geophysical exploration, and in particular, relates to a laser ultrasonic-based full-diameter cross-section core nondestructive acoustic detection method and device, electronic equipment and computer-readable storage medium. Background Art

[0002] Laser ultrasonic testing is an advanced non-destructive material testing technology that combines laser and ultrasonic technology to measure the physical properties, defects and structural characteristics of materials. The basic principle of laser ultrasonic testing is to excite ultrasonic waves through laser pulses. The laser beam is focused on the surface or inside of the material. When the laser pulse is absorbed or reflected, instantaneous temperature and pressure changes will occur, which will cause the generation and propagation of ultrasonic waves. Receivers are then used to detect these ultrasonic waves, and information about the material is obtained by analyzing the characteristics of the ultrasonic waves.

[0003] The core library divides the cores into 2 / 3 and 1 / 3 for different types of analysis and research. The split ratio depends on the needs of specific experiments or research, so as to make more effective use of limited core sample resources.

[0004] In the process of implementing the present invention, the inventors found that there are at least the following problems in the prior art:

[0005] Cores are an important tool in geological exploration for obtaining information about underground rocks. The acoustic properties of cores are crucial for studying the physical properties of underground rocks. Traditional core acoustic testing technology requires the preparation of standard rock samples on full-diameter cores, which can damage the original cores. In addition, if ultrasonic testing is performed directly on split cores, due to the special geometry of full-diameter split cores, the acoustic probe is not well coupled with the end face of the core, resulting in poor quality of the acoustic probe excitation signal. Therefore, conventional core acoustic testing methods can only perform a limited number of standard rock sample preparation tests, which limits the detection efficiency and cannot meet the needs of large-scale, high-efficiency core acoustic testing.

[0006] Therefore, developing a non-destructive and efficient core acoustic detection technology has great practical application value. This technology can improve the efficiency of core acoustic testing while avoiding damage to the core, making geological exploration more accurate and sustainable. This innovative acoustic detection method is expected to play a key role in geological exploration and resource development. Summary of the invention

[0007] The purpose of the present invention is to provide a full-diameter cross-section core non-destructive acoustic testing method based on laser ultrasound, which solves the problem of performing indoor core acoustic testing in rock physics acoustic testing when the core cannot be destroyed or rock samples cannot be prepared.

[0008] In order to achieve the above object, the present invention provides a full-diameter cross-section core non-destructive acoustic detection method based on laser ultrasound, comprising the following steps:

[0009] Step 1: irradiate a pulsed laser to a laser ultrasonic excitation point through a lens to excite an ultrasonic signal, which is then transmitted to an ultrasonic receiving point;

[0010] Step 2, receiving the ultrasonic signal from the ultrasonic receiving point through the ultrasonic probe and outputting an electrical signal;

[0011] Step 3, collecting electrical signals from different laser ultrasonic excitation points and outputting them to a processing module;

[0012] Step 4, amplifying and filtering the electrical signals at different laser ultrasonic excitation points to improve the signal-to-noise ratio, analyzing the signals after the improved signal-to-noise ratio, and finally obtaining the full-diameter cross-section core information.

[0013] Optionally, step 1 also includes building a full-diameter cross-section core laser ultrasonic detection device.

[0014] Optionally, the construction method comprises the following steps:

[0015] (1) Fix the full-diameter cross-section core position and configure the pulse laser and ultrasonic probe;

[0016] (2) Scale lines consistent with the core length are affixed to the core arc surface and cross-section surface to clarify the relative positions of the laser ultrasonic excitation point and the ultrasonic receiving point.

[0017] Optionally, the laser ultrasonic excitation point is located on the camber surface of the full-diameter cross-section core, and the ultrasonic receiving point is located on the opposite side of the camber surface of the full-diameter cross-section core.

[0018] Optionally, in step 2, the ultrasonic signal is a mechanical vibration signal.

[0019] Optionally, step 3 also includes superimposing multi-channel acoustic waveform data to improve the quality of ultrasonic signals at different laser ultrasonic excitation points of the full-diameter cross-sectioned core.

[0020] The second aspect of the present invention provides a full-diameter cross-section core nondestructive acoustic detection device based on laser ultrasound, comprising:

[0021] Pulse laser, used to generate pulse laser;

[0022] A lens is used for irradiating the pulse laser to the laser ultrasonic excitation point on the arc surface of the full-diameter cross-section core to excite an ultrasonic signal, and the ultrasonic signal is transmitted to the ultrasonic receiving point;

[0023] An ultrasonic probe is used to receive ultrasonic signals from ultrasonic receiving points and output electrical signals;

[0024] A signal acquisition module, used for acquiring the electrical signal output by the ultrasonic probe and transmitting the electrical signal to a processing module;

[0025] A processing module is used to amplify and filter the electrical signal to improve the signal-to-noise ratio, analyze the electrical signal after the signal-to-noise ratio is improved, and finally obtain the full-diameter cross-section core information;

[0026] The synchronization signal generating module is used to generate a synchronization signal, and the synchronization signal acts on the pulse laser and the data acquisition module to excite the ultrasonic signal.

[0027] Optionally, the ultrasonic probe is a piezoelectric sensor or a receiving crystal.

[0028] A third aspect of the present invention provides an electronic device, the electronic device comprising:

[0029] A memory storing executable instructions;

[0030] A processor runs the executable instructions in the memory to implement the laser ultrasonic-based full-diameter cross-section core nondestructive acoustic testing method.

[0031] A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the laser-ultrasonic-based full-diameter cross-section core nondestructive acoustic detection method.

[0032] The laser ultrasound-based full-diameter cross-section core nondestructive acoustic testing method of the present invention is based on the special geometric characteristics of the full-diameter cross-section core, uses a pulsed laser to generate ultrasonic waves on the core surface, and uses an acoustic testing technology received by an acoustic probe on the core cross-section surface. It does not require special preparation of rock samples, and uses laser to achieve core surface positioning ultrasonic excitation, which solves the problem of poor coupling between the core arc surface and the ultrasonic probe in traditional testing methods and improves detection efficiency and accuracy.

[0033] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0035] Figure 1A schematic flow chart of a laser ultrasonic full-diameter cross-section core nondestructive acoustic testing method according to an embodiment of the present invention is shown.

[0036] Figure 2 A schematic diagram of a laser ultrasonic full-diameter cross-section core testing device according to an embodiment of the present invention is shown.

[0037] Figure 3 An actual full-diameter cross-section core image according to an embodiment of the present invention is shown.

[0038] Figure 4 A waveform diagram of laser ultrasonic detection of a full-diameter cross-section core recorded according to an embodiment of the present invention is shown.

[0039] Figure 5 A graph showing the calibration fitting results of the laser ultrasonic first arrival fitting of an aluminum sample according to an embodiment of the present invention is shown.

[0040] Figure 6 A full-diameter cross-section core laser ultrasonic waveform superposition and velocity result diagram according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0041] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0042] In order to achieve the above object, the present invention provides a full-diameter cross-section core non-destructive acoustic detection method based on laser ultrasound, comprising the following steps:

[0043] Step 1: irradiate a pulsed laser to a laser ultrasonic excitation point through a lens to excite an ultrasonic signal, which is then transmitted to an ultrasonic receiving point;

[0044] Step 2, receiving the ultrasonic signal from the ultrasonic receiving point through the ultrasonic probe and outputting an electrical signal;

[0045] Step 3, collecting electrical signals from different laser ultrasonic excitation points and outputting them to a processing module;

[0046] Step 4, amplifying and filtering the electrical signals at different laser ultrasonic excitation points to improve the signal-to-noise ratio, analyzing the signals after the improved signal-to-noise ratio, and finally obtaining the full-diameter cross-section core information.

[0047] The present invention mainly uses an acoustic detection technology that excites ultrasonic waves on the surface of a full-diameter cross-section core using a pulse laser, uses an acoustic probe to receive acoustic vibration information on the cross-section surface of the core, and records the acoustic wave signals of the full-diameter cross-section core.

[0048] In the present invention, after the core surface is irradiated by the laser beam, instantaneous temperature and pressure changes will occur, thereby exciting ultrasonic waves to propagate in the core, and the ultrasonic probe receives the mechanical vibration generated by the ultrasonic waves and converts them into electrical signals.

[0049] In the present invention, the propagation time of the sound wave can be calculated from the processed signal, and then the sound velocity information of the rock can be obtained. The multi-channel acoustic waveform data can be superimposed to improve the acoustic signal quality of different points of the full-diameter cross-section core, and the longitudinal and transverse wave velocity information of the rock can be determined by combining the first arrival information of the acoustic probe and the thickness information of different points of the full-diameter cross-section core, and the amplitude, spectrum and other characteristics of the ultrasonic signal can also be analyzed.

[0050] Optionally, step 1 also includes building a full-diameter cross-section core laser ultrasonic detection device.

[0051] Optionally, the construction method comprises the following steps:

[0052] (1) Fix the full-diameter cross-section core position and configure the pulse laser and ultrasonic probe;

[0053] (2) Scale lines consistent with the core length are affixed to the core arc surface and cross-section surface to clarify the relative positions of the laser ultrasonic excitation point and the ultrasonic receiving point.

[0054] Optionally, the laser ultrasonic excitation point is located on the camber surface of the full-diameter cross-section core, and the ultrasonic receiving point is located on the opposite side of the camber surface of the full-diameter cross-section core.

[0055] Optionally, in step 2, the ultrasonic signal is a mechanical vibration signal.

[0056] Optionally, step 3 also includes superimposing multi-channel acoustic waveform data to improve the quality of ultrasonic signals at different laser ultrasonic excitation points of the full-diameter cross-sectioned core.

[0057] The second aspect of the present invention provides a full-diameter cross-section core nondestructive acoustic detection device based on laser ultrasound, comprising:

[0058] Pulse laser, used to generate pulse laser;

[0059] A lens is used for irradiating the pulse laser to the laser ultrasonic excitation point on the arc surface of the full-diameter cross-section core to excite an ultrasonic signal, and the ultrasonic signal is transmitted to the ultrasonic receiving point;

[0060] An ultrasonic probe, used to receive ultrasonic signals from ultrasonic receiving points and output electrical signals;

[0061] A signal acquisition module, used for acquiring the electrical signal output by the ultrasonic probe and transmitting the electrical signal to a processing module;

[0062] A processing module is used to amplify and filter the electrical signal to improve the signal-to-noise ratio, analyze the electrical signal after the signal-to-noise ratio is improved, and finally obtain the full-diameter cross-section core information;

[0063] The synchronization signal generating module is used to generate a synchronization signal, and the synchronization signal acts on the pulse laser and the data acquisition module to excite the ultrasonic signal.

[0064] Optionally, the ultrasonic probe is a piezoelectric sensor or a receiving crystal.

[0065] A third aspect of the present invention provides an electronic device, the electronic device comprising:

[0066] A memory storing executable instructions;

[0067] A processor runs the executable instructions in the memory to implement the laser ultrasonic-based full-diameter cross-section core nondestructive acoustic testing method.

[0068] A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the laser-ultrasonic-based full-diameter cross-section core nondestructive acoustic detection method.

[0069] Example 1

[0070] This embodiment provides a Figure 1 The laser ultrasonic-based full-diameter cross-section core nondestructive acoustic testing method shown includes the following steps:

[0071] Step 1: irradiate a pulsed laser to a laser ultrasonic excitation point through a lens to excite an ultrasonic signal, which is then transmitted to an ultrasonic receiving point;

[0072] Step 2, receiving the ultrasonic signal from the ultrasonic receiving point through the ultrasonic probe and outputting an electrical signal;

[0073] Step 3, collecting electrical signals from different laser ultrasonic excitation points and outputting them to a processing module;

[0074] Step 4, amplifying and filtering the electrical signals at different laser ultrasonic excitation points to improve the signal-to-noise ratio, analyzing the signals after the improved signal-to-noise ratio, and finally obtaining the full-diameter cross-section core information.

[0075] According to an embodiment of the present invention, step 1 also includes building a full-diameter cross-section core laser ultrasonic detection device.

[0076] According to an embodiment of the present invention, the construction method comprises the following steps:

[0077] (1) Fix the full-diameter cross-section core position and configure the pulse laser and ultrasonic probe;

[0078] (2) Scale lines consistent with the core length are affixed to the core arc surface and cross-section surface to clarify the relative positions of the laser ultrasonic excitation point and the ultrasonic receiving point.

[0079] According to an embodiment of the present invention, the laser ultrasonic excitation point is located on the camber surface of the full-diameter cross-section core, and the ultrasonic receiving point is located on the opposite side of the camber surface of the full-diameter cross-section core.

[0080] According to an embodiment of the present invention, in step 2, the ultrasonic signal is a mechanical vibration signal.

[0081] According to an embodiment of the present invention, step 3 also includes superimposing multi-channel acoustic waveform data to improve the quality of ultrasonic signals at different laser ultrasonic excitation points of the full-diameter cross-sectioned core.

[0082] The method of this embodiment is a non-destructive acoustic testing method for full-diameter cross-section cores based on laser ultrasound. Based on the special geometric characteristics of full-diameter cross-section cores, a pulsed laser is used to generate ultrasonic waves on the core surface, and an acoustic testing technology is used by an acoustic probe to receive the ultrasonic waves on the core cross-section surface. There is no need to specially prepare rock samples, and laser is used to achieve ultrasonic excitation on the core surface, which solves the problem of poor coupling between the core arc surface and the ultrasonic probe in traditional testing methods and improves detection efficiency and accuracy.

[0083] Example 2

[0084] This embodiment provides a Figure 2 The laser ultrasonic-based full-diameter cross-section core nondestructive acoustic testing device shown comprises:

[0085] Pulse laser, used to generate pulse laser;

[0086] A lens is used for irradiating the pulse laser to the laser ultrasonic excitation point on the arc surface of the full-diameter cross-section core to excite an ultrasonic signal, and the ultrasonic signal is transmitted to the ultrasonic receiving point;

[0087] An ultrasonic probe is used to receive ultrasonic signals from ultrasonic receiving points and output electrical signals;

[0088] A signal acquisition module, used for acquiring the electrical signal output by the ultrasonic probe and transmitting the electrical signal to a processing module;

[0089] A processing module is used to amplify and filter the electrical signal to improve the signal-to-noise ratio, analyze the electrical signal after the signal-to-noise ratio is improved, and finally obtain the full-diameter cross-section core information;

[0090] The synchronization signal generating module is used to generate a synchronization signal, and the synchronization signal acts on the pulse laser and the data acquisition module to excite the ultrasonic signal.

[0091] In some embodiments, the ultrasound probe is a piezoelectric sensor or a receiving crystal.

[0092] In some embodiments, it also includes building a full-diameter cross-section core laser ultrasonic detection device.

[0093] In some embodiments, the method of building comprises the following steps:

[0094] (1) Fix the full-diameter cross-section core position and configure the pulse laser and ultrasonic probe;

[0095] (2) Scale lines consistent with the core length are affixed to the core arc surface and cross-section surface to clarify the relative positions of the laser ultrasonic excitation point and the ultrasonic receiving point.

[0096] In some embodiments, the laser ultrasonic excitation point is located on the curvature surface of the full-diameter cross-section core, and the ultrasonic receiving point is located on the opposite surface of the curvature surface of the full-diameter cross-section core.

[0097] In some embodiments, the ultrasonic signal is a mechanical vibration signal.

[0098] In some embodiments, the method further includes superimposing multi-channel acoustic waveform data to improve the quality of ultrasonic signals at different laser ultrasonic excitation points of the full-diameter cross-sectioned core.

[0099] The device of this embodiment is a full-diameter cross-section core non-destructive acoustic testing method based on laser ultrasound. Based on the special geometric characteristics of the full-diameter cross-section core, a pulsed laser is used to generate ultrasonic waves on the core surface, and the acoustic testing technology is received by the acoustic probe on the core cross-section surface. There is no need to specially prepare rock samples. Laser is used to achieve ultrasonic excitation on the core surface, which solves the problem of poor coupling between the core arc surface and the ultrasonic probe in traditional testing methods and improves detection efficiency and accuracy.

[0100] For other detailed descriptions and advantages of this embodiment, reference may be made to the corresponding descriptions in the aforementioned embodiments, which will not be repeated here.

[0101] Example 3

[0102] This embodiment provides an electronic device, including a memory and a processor.

[0103] A memory storing executable instructions;

[0104] The processor runs the executable instructions in the memory to implement a full-diameter cross-section core non-destructive acoustic detection method based on laser ultrasound.

[0105] The laser ultrasonic-based full-diameter cross-section core nondestructive acoustic testing method includes the following steps:

[0106] Step 1: irradiate a pulsed laser to a laser ultrasonic excitation point through a lens to excite an ultrasonic signal, which is then transmitted to an ultrasonic receiving point;

[0107] Step 2, receiving the ultrasonic signal from the ultrasonic receiving point through the ultrasonic probe and outputting an electrical signal;

[0108] Step 3, collecting electrical signals from different laser ultrasonic excitation points and outputting them to a processing module;

[0109] Step 4, amplifying and filtering the electrical signals at different laser ultrasonic excitation points to improve the signal-to-noise ratio, analyzing the signals after the improved signal-to-noise ratio, and finally obtaining the full-diameter cross-section core information.

[0110] In some embodiments, the ultrasound probe is a piezoelectric sensor or a receiving crystal.

[0111] In some embodiments, it also includes building a full-diameter cross-section core laser ultrasonic detection device.

[0112] In some embodiments, the method of building comprises the following steps:

[0113] (1) Fix the full-diameter cross-section core position and configure the pulse laser and ultrasonic probe;

[0114] (2) Scale lines consistent with the core length are affixed to the core arc surface and cross-section surface to clarify the relative positions of the laser ultrasonic excitation point and the ultrasonic receiving point.

[0115] In some embodiments, the laser ultrasonic excitation point is located on the curvature surface of the full-diameter cross-section core, and the ultrasonic receiving point is located on the opposite surface of the curvature surface of the full-diameter cross-section core.

[0116] In some embodiments, the ultrasonic signal is a mechanical vibration signal.

[0117] In some embodiments, the method further includes superimposing multi-channel acoustic waveform data to improve the quality of ultrasonic signals at different laser ultrasonic excitation points of the full-diameter cross-sectioned core.

[0118] Specifically, the memory may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, a random access memory (RAM) and / or a cache memory (cache), etc. The non-volatile memory may include, for example, a read-only memory (ROM), a hard disk, a flash memory, etc.

[0119] The processor may be a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions. In one embodiment of the present invention, the processor is used to run the computer-readable instructions stored in the memory.

[0120] The electronic device according to the present embodiment uses a laser ultrasonic full-diameter cross-section core non-destructive acoustic detection method. Based on the special geometric features of the full-diameter cross-section core, a pulsed laser is used to generate ultrasonic waves on the core surface. The acoustic testing technology is received by the acoustic probe on the cross-section surface of the core. There is no need to specially prepare rock samples. The laser is used to locate the ultrasonic excitation on the core surface, which solves the problem of poor coupling between the core arc surface and the ultrasonic probe in traditional detection methods and improves detection efficiency and accuracy.

[0121] For other detailed descriptions and advantages of this embodiment, reference may be made to the corresponding descriptions in the aforementioned embodiments, which will not be repeated here.

[0122] Example 4

[0123] This embodiment provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, a laser ultrasonic-based full-diameter cross-section core non-destructive acoustic detection method is implemented.

[0124] The laser ultrasonic-based full-diameter cross-section core nondestructive acoustic testing method includes the following steps:

[0125] Step 1: irradiate a pulsed laser to a laser ultrasonic excitation point through a lens to excite an ultrasonic signal, which is then transmitted to an ultrasonic receiving point;

[0126] Step 2, receiving the ultrasonic signal from the ultrasonic receiving point through the ultrasonic probe and outputting an electrical signal;

[0127] Step 3, collecting electrical signals from different laser ultrasonic excitation points and outputting them to a processing module;

[0128] Step 4, amplifying and filtering the electrical signals at different laser ultrasonic excitation points to improve the signal-to-noise ratio, analyzing the signals after the improved signal-to-noise ratio, and finally obtaining the full-diameter cross-section core information.

[0129] In some embodiments, the ultrasound probe is a piezoelectric sensor or a receiving crystal.

[0130] In some embodiments, it also includes building a full-diameter cross-section core laser ultrasonic detection device.

[0131] In some embodiments, the method of building comprises the following steps:

[0132] (1) Fix the full-diameter cross-section core position and configure the pulse laser and ultrasonic probe;

[0133] (2) Scale lines consistent with the core length are affixed to the core arc surface and cross-section surface to clarify the relative positions of the laser ultrasonic excitation point and the ultrasonic receiving point.

[0134] In some embodiments, the laser ultrasonic excitation point is located on the curvature surface of the full-diameter cross-section core, and the ultrasonic receiving point is located on the opposite surface of the curvature surface of the full-diameter cross-section core.

[0135] In some embodiments, the ultrasonic signal is a mechanical vibration signal.

[0136] In some embodiments, the method further includes superimposing multi-channel acoustic waveform data to improve the quality of ultrasonic signals at different laser ultrasonic excitation points of the full-diameter cross-sectioned core.

[0137] The computer-readable storage medium according to the embodiment of the present invention stores non-transitory computer-readable instructions, and when the non-transitory computer-readable instructions are executed by a processor, all or part of the steps of the above-mentioned methods of the embodiments of the present invention are executed.

[0138] The above-mentioned computer-readable storage media include, but are not limited to: optical storage media (e.g., CD-ROM and DVD), magneto-optical storage media (e.g., MO), magnetic storage media (e.g., magnetic tape or mobile hard disk), media with built-in rewritable non-volatile memory (e.g., memory card) and media with built-in ROM (e.g., ROM box).

[0139] Those skilled in the art should be able to understand that in order to solve the technical problem of how to obtain a good user experience, the present embodiment may also include well-known structures such as a communication bus and an interface, and these well-known structures should also be included in the protection scope of the present invention.

[0140] According to the computer-readable storage medium of the present embodiment, the laser ultrasound-based full-diameter cross-section core non-destructive acoustic detection method is based on the special geometric characteristics of the full-diameter cross-section core, and a pulsed laser is used to generate ultrasonic waves on the core surface. The acoustic testing technology is received by the acoustic probe on the core cross-section surface. There is no need to specially prepare rock samples. The laser is used to achieve ultrasonic excitation on the core surface, which solves the problem of poor coupling between the core arc surface and the ultrasonic probe in traditional detection methods and improves detection efficiency and accuracy.

[0141] For other detailed descriptions and advantages of this embodiment, reference may be made to the corresponding descriptions in the aforementioned embodiments, which will not be repeated here.

[0142] Example 5

[0143] In order to verify the effect of the laser ultrasonic full-diameter cross-section core nondestructive acoustic detection method of the present invention, Figure 3 The cross-section core shown in the figure is predicted, where LY-301, LY-302, and LY-303 are different lithology combination sections, sandy laminae, sandy strips, and shale, respectively. The laser is excited from the pulse laser, and the corresponding position on the arc surface of the cross-section core is obtained through the lens, etc. The position of the acoustic receiving probe is configured, and the acoustic wave signal generated on the core surface is collected and recorded through the excitation signal and the synchronization signal. After recording, the next excitation point is changed to perform ultrasonic excitation and acoustic signal reception.

[0144] By using the longitudinal wave acoustic probe to receive the same excitation point multiple times, we can get Figure 4 , horizontal rock longitudinal wave waveform data of the rock reservoir section at three points and longitudinal wave waveform data of calibration aluminum blocks of different lengths.

[0145] Figure 5 In order to use the invention to record the acoustic waveforms of aluminum samples of different lengths, the fitting and calibration result diagrams are picked up respectively, which is mainly the method for determining the first arrival in conventional sound wave velocity testing.

[0146] Figure 6 The waveform data of multiple ultrasonic tests are superimposed and the velocity result image is shown. The calculation of rock P-wave velocity is mainly based on the intercept value of the fitting of aluminum samples of different lengths, which is used as the acoustic first arrival of the laser ultrasonic system. Combined with the core thickness at different points of the sample, the P-wave velocity of the core in different layers can be calculated by dividing the propagation distance by the propagation time. It can be seen that the acoustic waveforms at different points have different signal-to-noise ratios due to the different heterogeneity of the samples, and the P-wave and S-wave velocities vary slightly, which is mainly related to the physical and lithological properties of the sedimentary section.

[0147] For other detailed descriptions of this exemplary embodiment, reference may be made to the corresponding descriptions in the aforementioned embodiments, which will not be repeated here.

[0148] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A non-destructive acoustic testing method for full-diameter cross-section cores based on laser ultrasound. It is characterized in that The steps include: Step 1: irradiate a pulsed laser to a laser ultrasonic excitation point through a lens to excite an ultrasonic signal, which is then transmitted to an ultrasonic receiving point; Step 2, receiving the ultrasonic signal from the ultrasonic receiving point through the ultrasonic probe and outputting an electrical signal; Step 3, collecting electrical signals from different laser ultrasonic excitation points and outputting them to a processing module; Step 4, amplifying and filtering the electrical signals at different laser ultrasonic excitation points to improve the signal-to-noise ratio, analyzing the signals after the improved signal-to-noise ratio, and finally obtaining the full-diameter cross-section core information.

2. The laser ultrasonic full-diameter cross-section core nondestructive acoustic testing method according to claim 1, in, Step 1 also includes setting up a full-diameter cross-section core laser ultrasonic detection device.

3. The laser ultrasonic full-diameter cross-section core nondestructive acoustic testing method according to claim 2, in, The construction method comprises the following steps: (1) Fix the full-diameter cross-section core position and configure the pulse laser and ultrasonic probe; (2) Scale lines consistent with the core length are affixed to the core arc surface and cross-section surface to clarify the relative positions of the laser ultrasonic excitation point and the ultrasonic receiving point.

4. According to the laser ultrasound-based full-diameter cross-section core non-destructive acoustic detection method of claim 3, the laser ultrasonic excitation point is located on the curved surface of the full-diameter cross-section core, and the ultrasonic receiving point is located on the opposite surface of the curved surface of the full-diameter cross-section core.

5. The laser ultrasonic full-diameter cross-section core nondestructive acoustic testing method according to claim 1, in, In step 2, the ultrasonic signal is a mechanical vibration signal.

6. The laser ultrasonic full-diameter cross-section core nondestructive acoustic testing method according to claim 1, in, Step 3 also includes superimposing multi-channel acoustic waveform data to improve the quality of ultrasonic signals at different laser ultrasonic excitation points of the full-diameter cross-section core.

7. A full-diameter cross-section core non-destructive acoustic detection device based on laser ultrasound, It is characterized in that include: Pulse laser, used to generate pulse laser; A lens is used for irradiating the pulse laser to the laser ultrasonic excitation point on the arc surface of the full-diameter cross-section core to excite an ultrasonic signal, and the ultrasonic signal is transmitted to the ultrasonic receiving point; An ultrasonic probe, used to receive ultrasonic signals from ultrasonic receiving points and output electrical signals; A signal acquisition module, used for acquiring the electrical signal output by the ultrasonic probe and transmitting the electrical signal to a processing module; A processing module is used to amplify and filter the electrical signal to improve the signal-to-noise ratio, analyze the electrical signal after the signal-to-noise ratio is improved, and finally obtain the full-diameter cross-section core information; The synchronization signal generating module is used to generate a synchronization signal, and the synchronization signal acts on the pulse laser and the data acquisition module to excite the ultrasonic signal.

8. The laser ultrasonic full-diameter cross-section core nondestructive acoustic detection device according to claim 7, in, The ultrasonic probe is a piezoelectric sensor or a receiving crystal.

9. An electronic device, It is characterized in that The electronic device comprises: A memory storing executable instructions; A processor, wherein the processor runs the executable instructions in the memory to implement the full-diameter cross-section core non-destructive acoustic testing method based on laser ultrasound according to any one of claims 1-6.

10. A computer-readable storage medium, It is characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the laser-ultrasonic full-diameter cross-section core nondestructive acoustic detection method described in any one of claims 1 to 6 is implemented.

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