Acoustic camera

Abstract

According to the acoustic camera, the main body part and the extension part are arranged on the host, the front surface of the main body part is provided with the plurality of receiving holes, the microphone corresponding to the receiving holes is arranged in the main body, the extension part is provided with the first lens and the second lens, one of the first lens and the second lens is a fisheye lens, and the other is a common lens. When the space range of a concerned imaging area is small or the position of a sound source is intended to be visually displayed in a basically distortionless real scene picture, a common lens can be adopted for acoustic photographing; when the area of interest is a hemispherical complete sound field in front of the array, the fisheye lens can be used for acoustic photographing, so that the defect of narrow viewing angle range is overcome.

Description

Technical Field

[0001] The utility model belongs to the field of sound source visualization, and particularly relates to an acoustic camera. Background Art

[0002] Acoustic camera is an imaging device that characterizes the location of sound sources and is widely used in the field of sound source visualization. In complex spatial environments, it is difficult to quickly discover and locate sound sources such as abnormal sounds and noises by artificial or even single perception methods. Acoustic cameras calculate and determine the location of sound sources based on the sound signals received by the microphone array and the propagation characteristics of sound waves, and intuitively display the location of sound sources in the camera image with color depth, thus realizing the visualization of complex sound sources. This is of great significance for fault diagnosis, noise control, and abnormal warning in industrial production environments.

[0003] In the related art, the viewing angle of the lens is relatively narrow. When the sound source is outside the viewing angle, the sound source cannot be visualized; or when the three-dimensional space to be scanned is large, it is difficult to cover all areas with one acoustic photography. It is necessary to aim at different areas for acoustic photography multiple times and stitch them together, which is complicated to operate and inconvenient to use. Utility Model Content

[0004] The utility model discloses an acoustic camera, which can expand the visualization range of a single sound source.

[0005] In order to achieve the above technical effects, the utility model discloses an acoustic camera, comprising:

[0006] A host, the host comprising a main body and an extension portion, the extension portion being connected to the main body; the main body comprising a front surface, the front surface being provided with a plurality of receiving holes, and a microphone being provided inside the main body corresponding to the receiving holes;

[0007] The extension portion is provided with a first lens and a second lens, the first lens and the second lens are arranged at an interval, and the orientations of the first lens and the second lens are the same as the normal direction of the front surface; one of the first lens and the second lens is a fisheye lens, and the other is a normal lens.

[0008] As an optional implementation, it further includes a control panel, the first lens and the second lens are electrically connected to the control panel respectively, and the control panel is used to select the first lens or the second lens to take a real scene picture.

[0009] As an optional embodiment, the extension portion includes a first sub-portion and a second sub-portion, the first sub-portion and the second sub-portion are arranged at an interval relative to the main body, and one of the first lens and the second lens is arranged in the first sub-portion, and the other is arranged in the second sub-portion.

[0010] As an optional embodiment, the extension portion also includes a third sub-portion, which is respectively connected to the first sub-portion and the second sub-portion, and a third lens is provided on the third sub-portion. The orientation of the third lens is the same as that of the first lens, and the third lens is electrically connected to the control panel; the third lens is an infrared lens, and an infrared lamp is also provided on the third sub-portion corresponding to the third lens.

[0011] As an optional embodiment, the main body includes a bottom surface, the bottom surface is connected to the front surface, the bottom surface is provided with a storage groove, and a handle is movably provided in the storage groove, and the handle is used to be unfolded from the storage groove for hand-holding.

[0012] As an optional embodiment, it also includes a tripod, and a connecting portion is provided at the end of the tripod; a connecting hole is provided on the bottom surface corresponding to the connecting portion, and the connecting hole is spaced apart from the storage slot, and the connecting portion is used to cooperate with the connecting hole so that the tripod supports the main unit.

[0013] As an optional implementation, the tripod includes at least one telescopic joint.

[0014] As an optional embodiment, the main body also includes a back side, which is arranged opposite to the front side, and a display screen is provided on the back side, and the microphone, the first lens and the second lens are electrically connected to the display screen respectively.

[0015] As an optional implementation, the back side is also provided with an indicator light and a speaker, and the indicator light and the speaker are electrically connected to the control panel respectively.

[0016] As an optional implementation, the plurality of receiving holes are arranged at intervals on the front surface in the form of an Archimedean spiral.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The acoustic camera of the present application is provided with a main body and an extension part on a host, wherein a plurality of receiving holes are provided on the front of the main body, microphones are provided inside the main body corresponding to the receiving holes, and a first lens and a second lens are provided on the extension part, wherein one of the first lens and the second lens is a fisheye lens and the other is an ordinary lens. When the spatial range of the imaging area of ​​interest is small or the intention is to intuitively display the location of the sound source in a real-life picture with basically no distortion, an ordinary lens can be used for acoustic photography; when the area of ​​interest is a complete hemispherical sound field in front of the array, a fisheye lens can be used for acoustic photography, thereby solving the defect of a narrow viewing angle range. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram of a host from one perspective provided in an embodiment of the present application;

[0021] Figure 2 for Figure 1 A schematic diagram of another perspective of the host;

[0022] Figure 3 for Figure 1 A schematic diagram of the mainframe viewed from above;

[0023] Figure 4 for Figure 3 Schematic diagram of the host when the middle handle is unfolded;

[0024] Figure 5 A schematic diagram of a tripod;

[0025] Figure 6 for Figure 3 Schematic diagram of the acoustic camera after being mounted on a tripod.

[0026] Description of reference numerals:

[0027] Host, 1; main body, 11; front, 111; receiving hole, 111a; bottom, 112; storage slot, 112a; handle, 112b; connection hole, 112c; back, 113; display screen, 113a; indicator light, 113b; speaker, 113c; data interface, 113d; extension, 12; first lens, 121; second lens, 122; third lens, 123; infrared light, 123a; first sub-unit, 12a; second sub-unit, 12b; third sub-unit, 12c;

[0028] Tripod, 2; connecting part, 21; telescopic joint, 22. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the present utility model, the terms "upper", "lower", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the present utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or positional relationship, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For ordinary technicians in this field, the specific meanings of these terms in the present utility model can be understood according to the specific circumstances. In addition, the terms "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0031] Acoustic camera is an imaging device that characterizes the location of sound sources and is widely used in the field of sound source visualization. Sound source visualization requires determining the three-dimensional space range contained in the real-life picture taken by the optical camera, as well as the three-dimensional space range corresponding to the scanning plane of interest in the acoustic algorithm, and mapping the acoustic image from three dimensions to two dimensions according to the imaging law of the optical camera lens, and then merging it with the real-life picture. In existing acoustic cameras, the optical camera lens used is generally an ordinary lens, and its working mode is based on the common pinhole imaging model. Under this model, the length and width of the picture taken by the optical camera are similar to the length and width of the corresponding three-dimensional space area. When the focal length of the fixed-focus lens remains unchanged and the imaging size remains unchanged, its horizontal and vertical viewing angles are both fixed values. Therefore, the three-dimensional space range corresponding to the picture can be determined according to the picture size. The determined three-dimensional space range is used as the imaging range in the acoustic algorithm, so that the range of the optical and acoustic corresponding spaces can be matched, thereby realizing the fusion of the real-life picture and the acoustic image, and achieving the purpose of sound source visualization. In complex spatial environments, it is difficult to quickly discover and locate sound sources such as abnormal sounds and noises by manual or even single perception methods. The acoustic camera calculates the location of the sound source based on the sound signal received by the microphone array and the propagation characteristics of the sound wave, and intuitively displays the location of the sound source in the image taken by the camera with color depth, realizing the visual positioning of complex sound sources, which is of great significance for fault diagnosis, noise control, abnormal warning, etc. in industrial production environments.

[0032] Acoustic cameras are mainly composed of microphone arrays and optical cameras. In microphone arrays, the number and arrangement of microphones greatly affect the accuracy of sound source localization. Common microphone arrangements include linear arrangement, circular arrangement, and spiral array. Reasonable arrangement and more microphones can provide more spatial information, thereby improving the accuracy of sound source localization. The optical camera in the acoustic camera collects real-life images through a lens, and most optical cameras use ordinary lenses that follow the principle of pinhole imaging. The viewing angle is usually only a few dozen degrees, which makes it difficult to cover the scanning area of ​​interest in the array.

[0033] Based on this, the present application provides an acoustic camera, which is achieved by arranging a main body and an extension part on a host, wherein a plurality of receiving holes are arranged on the front of the main body, a microphone is arranged inside the main body corresponding to the receiving holes, and a first lens and a second lens are arranged on the extension part, wherein one of the first lens and the second lens is a fisheye lens and the other is an ordinary lens. When the spatial range of the imaging area of ​​interest is small or the intention is to intuitively display the location of the sound source in a real-life picture with basically no distortion, an ordinary lens can be used for acoustic photography; when the area of ​​interest is a complete hemispherical sound field in front of the array, a fisheye lens can be used for acoustic photography, thereby solving the defect of a narrow viewing angle range.

[0034] The technical solution of the present application will be further described below in conjunction with embodiments and drawings.

[0035] See also Figures 1 to 3 The acoustic camera provided in this embodiment includes a host 1, wherein the host 1 includes a main body 11 and an extension 12, and the extension 12 is connected to the main body 11; the main body 11 includes a front 111, and the front 111 is provided with a plurality of receiving holes 111a, and a microphone is provided inside the main body 11 corresponding to the receiving holes 111a. The extension 12 is provided with a first lens 121 and a second lens 122, and the first lens 121 and the second lens 122 are arranged at intervals, and the orientations of the first lens 121 and the second lens 122 are the same as the normal direction of the front 111; one of the first lens 121 and the second lens 122 is a fisheye lens, and the other is an ordinary lens. The angle of view of the fisheye lens is larger than that of the ordinary lens, and a real-life picture of a larger imaging area can be obtained at the same time, but there will be more serious distortion than the ordinary lens. At the same time, two different types of lenses, the first lens 121 and the second lens 122, are provided, and the user can select or use them in combination as needed to obtain the desired effect. For example, the fisheye lens in the first lens 121 and the second lens 122 is used to quickly realize the preliminary positioning of the sound source, and then the ordinary lens is used to realize the precise positioning of the sound source.

[0036] Optionally, when the first lens 121 or the second lens 122 is a fisheye lens, the viewing angle is 180 degrees.

[0037] Optionally, when the first lens 121 or the second lens 122 is a normal lens, the viewing angle is 30 degrees.

[0038] Optionally, the extension portion 12 includes a first sub-portion 12a and a second sub-portion 12b, the first sub-portion 12a and the second sub-portion 12b are arranged at intervals relative to the main body portion 11, and one of the first lens 121 and the second lens 122 is arranged in the first sub-portion 12a, and the other is arranged in the second sub-portion 12b. In this way, the first lens 121 and the second lens 122 are relatively far apart, and the mutual influence between the first lens 121 and the second lens 122 is small, which helps to obtain a more accurate sound source visualization result. Such a design also increases the internal space of the host 1, reduces the difficulty of arranging the components inside the host 1, and is also conducive to the heat dissipation of the components inside the host 1.

[0039] Optionally, the extension portion 12 also includes a third sub-portion 12c, which is respectively connected to the first sub-portion 12a and the second sub-portion 12b. The third sub-portion 12c is provided with a third lens 123, the orientation of the third lens 123 is the same as that of the first lens 121, and the third lens 123 is electrically connected to the control panel. The third lens 123 is an infrared lens, and an infrared lamp 123a is also provided on the third sub-portion 12c corresponding to the third lens 123. The third lens 123 is mainly used in low-light environments such as nighttime. When in such an environment, it automatically switches to the third lens 123 or the operator manually switches to the third lens 123, and the infrared lamp 123a automatically turns on to emit infrared light. The third lens 123 can receive the infrared light reflected back in the space and form an image, thereby realizing the shooting of real-life pictures in a low-light environment. It can be seen that the provision of the third lens 123 and the infrared lamp 123a helps to broaden the use scenarios of the acoustic camera of this embodiment.

[0040] It should be noted that the number and arrangement of the infrared lamps 123a can be: two infrared lamps 123a are symmetrically arranged on both sides of the third lens 123, or other arrangements can be adopted (for example, the infrared lamps 123a are arranged in a ring to surround the third lens 123, etc.) and a greater or lesser number of infrared lamps 123a can be set. In practice, factors such as the distance between the sound source camera and the monitoring position and the obstructions between the two, the brightness of the specific usage scenario, and the absorption capacity of suspended matter in the air to infrared rays should be considered comprehensively.

[0041] Optionally, the plurality of receiving holes 111a are arranged at intervals on the front face 111 in the form of an Archimedean spiral. The acoustic camera can select different microphone arrangements according to different requirements for spatial filtering performance, such as uniform plane arrays such as rectangular arrays and non-uniform plane arrays such as spiral arrays. Compared with the spiral array of multiple arms, the arrangement of the Archimedean spiral is a continuous surrounding arrangement, which contains more microphones per unit area and covers more azimuth angles, which is conducive to more accurate visualization of the sound source. At the same time, the structure is simple and easy to manufacture and debug.

[0042] Optionally, the acoustic camera further includes a control panel, the first lens 121 and the second lens 122 are electrically connected to the control panel respectively, and the control panel is used to select the first lens 121 or the second lens 122 to take a real scene picture. At the same time, the control panel can also integrate other control functions for the performance of the first lens 121 and the second lens 122 to improve the quality of the real scene pictures obtained by the first lens 121 and the second lens 122.

[0043] Optionally, the main body 11 further includes a back side 113, the back side 113 is arranged opposite to the front side 111, the back side 113 is provided with a display screen 113a, and the microphone, the first lens 121 and the second lens 122 are electrically connected to the display screen 113a respectively. In this way, the result of the sound source visualization can be displayed in real time on the display screen 113a, which is conducive to improving the convenience of using the sound source camera of this embodiment. In addition, the display screen 113a can be a touch screen, and the control panel is integrated with the display screen 113a, which is conducive to improving the integration of the acoustic camera and reducing the cost of the acoustic camera.

[0044] Optionally, the back 113 is further provided with an indicator light 113b and a speaker 113c, which are electrically connected to the control panel. In an industrial environment, abnormal phenomena are usually accompanied by specific acoustic events, such as fault sounds, air leakage sounds, spark sounds, etc. When the acoustic camera detects these abnormal acoustic events, an alarm can be issued through the indicator light 113b and the speaker 113c, and the location of the abnormal acoustic event can be intuitively displayed on the display screen 113a, thereby improving the convenience of using the acoustic camera.

[0045] Optionally, the back 113 may also be provided with a data interface 113d, through which the acoustic camera of this embodiment may be connected to an external device, such as a control center, a data center, etc., so that an operator may control and monitor multiple acoustic cameras at the same time, and the acoustic camera may also transmit data to the external device to achieve data backup. Exemplarily, the data interface 113d may be an interface with a physical structure, such as a USB interface, a common network interface, or an interface without a physical structure that transmits data via wireless signals, such as a Bluetooth module, a WIFI network module, etc., which is not limited in this embodiment.

[0046] See also Figures 3 to 6 Optionally, the main body 11 includes a bottom surface 112, the bottom surface 112 is connected to the front surface 111, the bottom surface 112 is provided with a storage groove 112a, and a handle 112b is movably provided in the storage groove 112a, and the handle 112b is used to be unfolded from the storage groove 112a for hand-holding. In this way, when the acoustic camera of this embodiment is temporarily used, the user can hold the handle 112b, which is conducive to improving the convenience of using the sound source camera of this embodiment.

[0047] Optionally, the acoustic camera further comprises a tripod 2, the end of the tripod 2 is provided with a connecting portion 21; the bottom surface 112 is provided with a connecting hole 112c corresponding to the connecting portion 21, the connecting hole 112c is arranged at an interval with the storage slot 112a, and the connecting portion 21 is used to cooperate with the connecting hole 112c so that the tripod 2 supports the host 1. When the acoustic camera of this embodiment is required to perform acoustic photography of a fixed position for a long time and stably, the use of the tripod 2 can improve the stability of the installation of the acoustic camera, thereby obtaining a better shooting effect. When it is necessary to frequently perform acoustic photography of different equipment, places or temporarily a certain equipment or place, the host 1 can be rotated with the help of the handle 112b to fix the host 1 in the vertical direction, and the handle 112b can be supported with both hands and aimed at the target area, so that flexible acoustic photography can be performed.

[0048] For example, the connection portion 21 and the connection hole 112c can be a thread and a threaded hole to form a threaded connection. They can also be a light hole and an optical axis with a clearance fit or a transition fit, or elastic parts such as a ball or a spring can be added on this basis to enhance the connection effect. This embodiment is not limited here.

[0049] Optionally, the tripod 2 includes at least one telescopic section 22. In this way, the tripod 2 can be telescoped within a certain range, thereby adjusting the height of the host 1, making it convenient for the sound source camera to shoot the target area.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An acoustic camera, characterized in that: include: A host, the host comprising a main body and an extension portion, the extension portion being connected to the main body; the main body comprising a front surface, the front surface being provided with a plurality of receiving holes, and a microphone being provided inside the main body corresponding to the receiving holes; The extension portion is provided with a first lens and a second lens, the first lens and the second lens are arranged at an interval, and the orientations of the first lens and the second lens are the same as the normal direction of the front surface; one of the first lens and the second lens is a fisheye lens, and the other is a normal lens.

2. An acoustic camera according to claim 1, characterized in that: It also includes a control panel, the first lens and the second lens are electrically connected to the control panel respectively, and the control panel is used to select the first lens or the second lens to take a real scene picture.

3. An acoustic camera according to claim 2, characterized in that: The extension portion includes a first sub-portion and a second sub-portion. The first sub-portion and the second sub-portion are arranged with a distance relative to the main body portion. One of the first lens and the second lens is arranged in the first sub-portion, and the other is arranged in the second sub-portion.

4. An acoustic camera according to claim 3, characterized in that: The extension part also includes a third sub-part, which is respectively connected to the first sub-part and the second sub-part, and a third lens is provided on the third sub-part. The orientation of the third lens is the same as that of the first lens, and the third lens is electrically connected to the control panel; the third lens is an infrared lens, and an infrared lamp is also provided on the third sub-part corresponding to the third lens.

5. The acoustic camera according to claim 1, characterized in that: The main body includes a bottom surface, the bottom surface is connected to the front surface, the bottom surface is provided with a storage groove, a handle is movably provided in the storage groove, and the handle is used to be unfolded from the storage groove for hand holding.

6. The acoustic camera according to claim 5, characterized in that: It also includes a tripod, and a connecting part is provided at the end of the tripod; a connecting hole is provided on the bottom surface corresponding to the connecting part, and the connecting hole is spaced apart from the storage slot. The connecting part is used to cooperate with the connecting hole so that the tripod supports the host.

7. The acoustic camera according to claim 6, characterized in that: The tripod comprises at least one telescopic joint.

8. The acoustic camera according to claim 2, characterized in that: The main body also includes a back side, which is arranged opposite to the front side, and a display screen is provided on the back side. The microphone, the first lens and the second lens are electrically connected to the display screen respectively.

9. The acoustic camera according to claim 8, characterized in that: The back side is also provided with an indicator light and a speaker, and the indicator light and the speaker are electrically connected to the control panel respectively.

10. An acoustic camera according to any one of claims 1 to 9, characterized in that: The plurality of receiving holes are arranged at intervals on the front surface in the manner of an Archimedean spiral.

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