Portable acoustic imager

Abstract

The utility model discloses a portable acoustic imager, which relates to the technical field of imagers and comprises a shell. A displayer and a square microphone array disc are installed on the two sides of the shell respectively, a plurality of microphone probes are arranged on the microphone array disc, a visible light imaging module surrounded by the microphone probes is arranged in the center of the microphone array disc, and thermal imaging modules not surrounded by the microphone probes are arranged at the corners of the microphone array disc. A mainboard and a power supply module for supplying power to the mainboard are arranged in the shell; the mainboard is connected with the microphone probe, the visible light imaging module and the thermal imaging module through the signal adapter plate; according to the utility model, under complicated field working conditions such as similar gas path system abnormal points, equipment abnormal hot spots, poor cable contact, circuit overload, power supply faults and the like, the acoustic-thermal imaging integrated design can cover the two fields of gas leakage and thermal imaging detection, and early prediction and rapid diagnosis and maintenance can be effectively carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of imagers, in particular to a portable acoustic imager. Background Art

[0002] Acoustic imagers are advanced detection equipment that can present sound in a visual way. Its working principle is to collect and analyze sound signals in the target area through an array of multiple highly sensitive microphones. Then, the sound data is processed by processing components, and the location, intensity and other information of the sound source are converted into intuitive images and displayed on the screen; acoustic imagers play an important role in many fields. Traditional imagers transmit the collected signals to the PC for calculation, which has the disadvantages of complex operation and inconvenient portability; many portable imager products have single functions. Utility Model Content

[0003] The utility model aims to provide a small portable acoustic imager integrating acoustic, optical and thermal imaging.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A portable acoustic imager comprises a shell; the outer ring side of the shell is provided with a rubber bag; a display and a square microphone array disk are respectively installed on both sides of the shell, a plurality of microphone probes are arranged on the microphone array disk, a visible light imaging module surrounded by the microphone probes is provided in the center of the microphone array disk, a thermal imaging module not surrounded by the microphone probes is provided at the corner of the microphone array disk, a main board and a power supply module for supplying power to the main board are provided in the shell; the main board is connected to the microphone probes, the visible light imaging module and the thermal imaging module through a signal adapter board.

[0006] Furthermore, a distance measuring sensor surrounded by microphone probes is provided at the center of the microphone array disk.

[0007] Furthermore, the power module includes a rechargeable lithium battery pack.

[0008] Furthermore, the display includes a touch-controlled display screen.

[0009] Furthermore, the mainboard receives signals from the microphone probe, the visible light imaging module and the thermal imaging module respectively, and the mainboard output signal is displayed through a display.

[0010] Furthermore, 128 microphone probes are arranged on the microphone array disk.

[0011] Furthermore, the microphone probes on the microphone array disk include a first probe group, a second probe group and a third probe group arranged from the inside to the outside, the first probe group includes a plurality of circumferentially evenly distributed microphone probes, the second probe group includes a plurality of circumferentially evenly distributed microphone probe groups, each group includes three microphone probes distributed in a triangular shape; the third probe group includes a plurality of circumferentially evenly distributed microphone probe groups, each group includes a plurality of arc-shaped microphone probes, and the distances between each microphone probe in each group and the center of the microphone array disk are different.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] When faced with complex on-site working conditions such as abnormal points in the gas system, abnormal hot spots in the equipment, poor cable contact, circuit overload, power failure, etc., the integrated acoustic and thermal imaging design of the utility model can cover the two major areas of gas leakage and thermal imaging detection, and effectively perform early prediction, rapid diagnosis and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of module connection of the utility model.

[0015] Figure 2 It is a side view schematic diagram of the utility model from a first viewing angle.

[0016] Figure 3 It is a side view schematic diagram of the utility model from a second viewing angle.

[0017] Figure 4 It is a schematic diagram of the internal structure of the utility model.

[0018] Figure 5 This is a schematic diagram of the electrical cabinet imaging of the utility model.

[0019] Figure 6 It is a schematic diagram of the surface discharge position of the utility model.

[0020] Figure 7 This is a schematic diagram of the corona discharge position of the utility model.

[0021] Figure 8 The figure is a schematic diagram of the working principle of the phase shift-sum algorithm of the utility model.

[0022] Fig. 9 This is a schematic diagram of image superposition of the utility model.

[0023] Fig.10 It is a schematic diagram of the sound source intensity conversion process of the utility model.

[0024] In the figure: 1. Shell; 2. Rubber package; 3. Main board; 4. Display screen; 5. Power module; 6. Signal adapter board; 7. Microphone probe; 8. Visible light imaging module; 9. Thermal imaging module; 10. Distance measuring sensor; 11. Microphone array disk; 71. First probe group; 72. Second probe group; 73. Third probe group. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] The present invention is further described in detail below in conjunction with the embodiments.

[0029] Specific embodiments of the portable acoustic imager provided by the utility model:

[0030] See also Figure 1-10 The portable acoustic imager mainly includes a housing 1, a mainboard 3, a display screen 4, a power module 5, a microphone array disk 11, a visible light imaging module 8, a thermal imaging module 9, etc. The functional module diagram is shown in FIG. Figure 1The microphone array disk 11 is mounted with a visible light imaging module 8 and a thermal imaging module 9, and the housing 1 is provided with a plug-in base plate, a hard disk, a core board, the above-mentioned main board 3 and the above-mentioned power module 5; a liquid crystal touch display assembly is arranged on the front side of the housing 1, and a microphone array disk 11 is mounted on the rear side, and the liquid crystal touch display assembly includes a display screen 4 and a touch control module connected to the display screen 4, so that the display screen 4 can be touched; the power module 5 includes a rechargeable lithium battery pack.

[0031] The visible light imaging module 8, the microphone array disk 11 and the thermal imaging module 9 all have built-in sensors, which scan and receive the photoacoustic and thermal signals respectively, and transmit the collected signals to the main board 3; the main board 3 mainly performs calculations such as editing and outputting the waveforms of the photoacoustic and thermal signals, controlling signal acquisition, array measurement technology, and algorithm superposition of the photoacoustic and thermal images, so as to present and save the detection results, and the output results are presented through the display screen 4.

[0032] 128 MEMS digital microphone probes 7 are arranged in an array on the microphone array disk 11; the visible light imaging module 8 is located at the center of the microphone array disk 11, and the thermal imaging module 9 is located at the edge of the microphone array disk 11. In this embodiment, the visible light imaging module 8 includes a white light camera installed in the center of the microphone array disk 11, and the thermal imaging module 9 includes a thermal infrared camera installed at a corner of the microphone array disk 11. A distance sensor 10 adjacent to the visible light imaging module 8 is also installed in the middle of the microphone array disk 11. The distance sensor 10 detects the distance between the detected surface and the imager to facilitate confirmation of the specific location of the detected area. This embodiment can be used for leak detection in compressed air, gas and vacuum systems, electrical partial discharge detection in electrical cabinets, substations, etc., and temperature anomaly detection.

[0033] The working principle of acoustic imaging is: the signals collected by each array element are weighted and summed to form a beam, and the beam is guided by searching for the possible location of the sound source, and the weight is modified to maximize the output signal power of the microphone array. At each wavelength of interest, the processing of the array signal gives the energy level at each given spatial scanning grid point or at the arrival of each signal. According to the spatial phase difference generated by the array signal, the spatial position of the sound source is determined to form an acoustic cloud map; all the previous calculations and summations are performed through the mainboard 3, and the mainboard 3 GPU is used to realize the spatial rapid scanning of acoustic imaging, and the mainboard 3 CPU is used to complete tasks such as FFT calculation and program serial control, giving full play to the hardware computing power, and fundamentally and effectively improving the spatial resolution accuracy of acoustic imaging. At the same time, the real-time image or video taken by the white light camera on the microphone array disk 11 is superimposed in a transparent manner to form an intuitive and visual state on the display screen 4.

[0034] If the signal waveform has periodic characteristics, and the pulse front is relatively steep and has obvious phase regularity and other characteristics, the signal may be a partial discharge signal. The working principle of partial discharge (PRPD spectrum): the signal collected by the sensor is distributed within a power frequency cycle, the horizontal axis is a power frequency cycle, and the vertical axis is the voltage value. The effective voltage value of the discharge signal within a power frequency cycle is put into this two-dimensional coordinate system in the form of a point, and the points collected in all power frequency cycles are superimposed to form an accumulation diagram. Surface discharge and corona discharge are as follows Figure 6 and Figure 7 shown.

[0035] The sound and light display modes are switched through the display screen 4. The center temperature and the highest and lowest temperatures of the object being measured are displayed at the same time. The principle of thermal imaging technology is based on infrared radiation from the surface of the object. Any object will emit infrared radiation, and its intensity is related to the temperature of the surface of the object. The infrared radiation captured by the sensor is converted into electrical signals, and then these electrical signals are converted into USB signals, which are processed by the system motherboard 3 to obtain images, which are intuitively visible on the display screen 4.

[0036] This embodiment uses a multi-channel microphone to collect sound pressure audio data, uses the mainboard 3CPU to implement FFT calculation of multi-channel sound pressure data, and collects optical images at the same time, and further synthesizes the sound source intensity distribution with the optical image to obtain acoustic imaging pictures and thermal imaging pictures. The following is a detailed description of the scheme:

[0037] The microphone array disk 11 is equipped with 128 high-speed MEMS digital microphone probes 7, which synchronously receive and analyze sound signals in space. Since the distances between the sound source and each microphone in the array are not equal, the sound waves received by each microphone have different delays. Through the FFT algorithm, the received data is deeply analyzed to obtain the amplitude value and position information of the array signal at each wavelength of interest. The obtained data is then converted into the time / frequency domain to generate intuitive and loud time domain images and frequency domain images. Finally, based on the position and angle information, the spatial sound field distribution state is accurately presented, and the collected sound is visualized on the display screen 4 in the form of a color contour map, effectively measuring the sound field distribution. Figure 8 shown.

[0038] Specifically, the microphone probes 7 on the microphone array disk 11 include a first probe group 71, a second probe group 72 and a third probe group 73 arranged from the inside to the outside. The first probe group 71 includes a plurality of circumferentially evenly distributed microphone probes 7. The second probe group 72 includes a plurality of circumferentially evenly distributed groups of microphone probes 7, each group includes three microphone probes 7 distributed in a triangular shape. The third probe group 73 includes a plurality of circumferentially evenly distributed groups of microphone probes 7, each group includes a plurality of arc-shaped microphone probes 7, and the distances between each microphone probe 7 in each group and the center of the microphone array disk 11 are different.

[0039] The first probe group 71 includes three circles of microphone probes 7, of which the inner circle of microphone probes 7 is relatively dense and surrounds the visible light imaging module 8 and the distance sensor 10, and the outer two circles of microphone probes 7 are relatively sparse; the number of the inner circle of microphone probes 7 is not less than the sum of the numbers of the outer two circles of microphone probes 7. One end of the microphone probe 7 group of the third probe group 73 is located inside the adjacent microphone probe 7 group.

[0040] The conventional array modes of microphone probes 7 include circular, spiral, and random. The single array mode makes its detection dynamic characteristics poor. The array mode of this embodiment can accurately present the spatial sound field distribution state, and visualize the collected sound on the display screen 4 in the form of a color contour map, effectively measuring the sound field distribution.

[0041] Perfect superposition of the sound field map and the visible light video image: Based on the above calculation results of the sound source intensity spatial distribution, the control and matching of the system motherboard 3CUP and GPU are optimized, and the sound source intensity distribution matrix S is transformed to obtain the sound source intensity distribution heat map. Use a high-definition camera to take pictures and videos of the target, and through the rotation and translation of the image, the calculated sound source surface is superimposed and fused with the optical image to obtain the heat map and actual spatial distribution of the noise source. Fig. 9 and Fig.10 shown.

[0042] When gas leaks in a compressed air system, the escaping gas will induce turbulence at the leak, causing rapid changes in sound pressure and air flow rate. These changes will be converted into sound waves and propagate around. By collecting and analyzing the leakage sound, the location and intensity of the gas leak can be determined, helping maintenance personnel to accurately and quickly repair the gas pipeline. It can also help check the integrity and quality of the gas pipeline and prevent safety hazards.

[0043] When the detected object has equipment abnormalities such as overheating, low temperature, high voltage, overload, etc., the device can switch to thermal imaging mode to quickly and accurately identify and locate it. And diagnosis can be performed without stopping the machine to ensure the normal operation of the equipment.

[0044] The CPU of the mainboard 3 is mainly responsible for the analysis, calculation, recording and storage of data such as the waveform editing and output of acoustic, optical and thermal signals, the control of signal acquisition, array measurement and the superposition of acoustic, optical and thermal images. It serves as a platform for the operation of portable image processing software. A microphone array disk 11 of a 128-MEMS digital microphone probe 7, plus a high-pixel visible light imaging module 8 and a high-resolution thermal imaging module 9 installed thereon, receives acoustic, optical and thermal signals and converts them into USB signals through the signal adapter board 6 to be transmitted to the mainboard 3.

[0045] The mainboard 3 is connected to the high-brightness display screen 4 via the LVDS bus. The display screen 4 equipped with a touch module serves as a human-computer interaction interface. The detection software is operated through the touch screen to display the detection results of the sound and light superposition image and the thermal imaging screen. A rechargeable lithium battery pack is placed inside the housing 1, and the power module 5 supplies power to the mainboard 3, the microphone probe 7, the display screen 4, and each acquisition module; the power module 5 supports the operation of the host system, collects power information, and transmits the power information to the mainboard 3 through the RS232 serial port.

[0046] When faced with complex on-site conditions such as abnormal hot spots in equipment, poor cable contact, circuit overload, power failure, etc., the integrated acoustic and thermal imaging design can cover the two major areas of gas leakage and thermal imaging detection, effectively performing early prediction and rapid diagnosis and maintenance. The outer side of the shell 1 has a rubber coating 2, which is also more convenient for operators to use and protects the internal structure.

[0047] This product takes into account the detection of distant targets. In order to ensure that the detected targets are clearly visible, a high-resolution thermal imaging module 9 is selected. The specific parameters are as follows: Thermal infrared camera pixel of thermal imaging module 9: 640×512; field of view: 32.9°×26.6°; focal length: 13mm; frame rate: 25fps; temperature measurement range and accuracy: -20℃~+120℃±3℃.

[0048] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A portable acoustic imager, comprising a housing (1); characterized in that: The outer ring side of the shell (1) is provided with a rubber bag (2); a display and a square microphone array disk (11) are respectively installed on both sides of the shell (1); a plurality of microphone probes (7) are arranged on the microphone array disk (11); a visible light imaging module (8) surrounded by the microphone probes (7) is provided at the center of the microphone array disk (11); a thermal imaging module (9) not surrounded by the microphone probes (7) is provided at the corner of the microphone array disk (11); a main board (3) and a power supply module (5) for supplying power to the main board (3) are provided in the shell (1); the main board (3) is connected to the microphone probes (7), the visible light imaging module (8) and the thermal imaging module (9) via a signal adapter board (6).

2. The portable acoustic imager according to claim 1, characterized in that: A distance measuring sensor (10) surrounded by a microphone probe (7) is provided at the center of the microphone array disk (11).

3. The portable acoustic imager according to claim 1, characterized in that: The power module (5) comprises a rechargeable lithium battery pack.

4. The portable acoustic imager according to claim 1, characterized in that: The display comprises a touch-controllable display screen (4).

5. The portable acoustic imager according to claim 1, characterized in that: The main board (3) receives signals from the microphone probe (7), the visible light imaging module (8) and the thermal imaging module (9) respectively, and the main board (3) outputs signals which are displayed on a display.

6. The portable acoustic imager according to claim 1, characterized in that: 128 microphone probes (7) are arranged on the microphone array disk (11).

7. The portable acoustic imager according to claim 1 or 6, characterized in that: The microphone probes (7) on the microphone array disk (11) include a first probe group (71), a second probe group (72), and a third probe group (73) arranged from the inside to the outside, the first probe group (71) includes a plurality of microphone probes (7) evenly distributed around the circumference, the second probe group (72) includes a plurality of groups of microphone probes (7) evenly distributed around the circumference, each group including three microphone probes (7) distributed in a triangular shape; the third probe group (73) includes a plurality of groups of microphone probes (7) evenly distributed around the circumference, each group including a plurality of microphone probes (7) distributed in an arc shape, and the distances between the microphone probes (7) in each group and the center of the microphone array disk (11) are different.

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