Ultrasonic field detection device and ultrasonic emission detection system

Abstract

The utility model provides an ultrasonic field detection device and an ultrasonic emission detection system.The detection device comprises a container used for containing a sound conducting medium, an ultrasonic field detection unit, a rotating mechanism and a processing unit, and a mounting position is arranged at the bottom of the container; each ultrasonic field detection unit comprises a light emitting unit and a camera shooting unit which are oppositely arranged on the two sides of the container along the optical axis, the optical axis is orthogonal to the axis of the ultrasonic field generated by the ultrasonic generation unit, and at least one ultrasonic field detection unit can rotate to a plurality of different stations around the axis of the ultrasonic field under the action of the rotating mechanism; the light emitting unit is used for emitting detection light at multiple different stations, the camera shooting unit is used for correspondingly collecting image information of the detection light deflected by the ultrasonic field at the different stations, and the processing unit generates a three-dimensional image of the ultrasonic field based on the image information collected at the multiple different stations. Therefore, the ultrasonic field emitted by the ultrasonic transmitter can be nondestructively detected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ultrasonic, in particular, to an ultrasonic field detection device and an ultrasonic emission detection system. BACKGROUND

[0002] In the research and development process of ultrasonic diagnosis and treatment equipment, the measurement of ultrasonic field is a very important link. The ultrasonic field visualization technology can directly display the distribution of the sound field, and can measure the wavelength, sound speed, sound pressure and other parameters of the sound field. The hydrophone technology is mainly used in the sound field visualization technology.

[0003] The working principle of the hydrophone is to convert the sound pressure signal on the surface of the sensor into an electric signal, and then convert the electric signal into a digital signal through an analog-to-digital converter. The high-frequency ultrasonic wave is greatly attenuated in the sparse medium such as air. In the measurement process, the ultrasonic emission unit can be immersed in the sound-conducting medium, and the hydrophone is arranged at a distance from the ultrasonic emission unit, so as to measure the propagation of the ultrasonic wave in the sound-conducting medium.

[0004] Since the hydrophone needs to be placed in the sound field, its structure will affect the sound field and may cause reflection of the ultrasonic wave, which will affect the accuracy of the measurement. And adjusting the position of the hydrophone for three-dimensional modeling further leads to complex equipment and serious distortion of three-dimensional modeling. CONTENT OF THE INVENTION

[0005] In order to at least partially solve the problems existing in the prior art, one aspect of the present application provides an ultrasonic field detection device, comprising: a container for containing a sound-conducting medium, the bottom of the container is provided with a mounting position for mounting an ultrasonic emission unit; at least one group of ultrasonic field detection units, each group of ultrasonic field detection units comprising a light-emitting unit and a camera unit oppositely arranged on both sides of the container along an optical axis, the optical axis being orthogonal to the axis of the ultrasonic field generated by the ultrasonic emission unit; a rotating mechanism, the at least one group of ultrasonic field detection units being rotatable to a plurality of different stations around the axis of the ultrasonic field under the action of the rotating mechanism, the light-emitting unit being used for emitting detection light at the plurality of different stations, and the camera unit being used for correspondingly collecting image information of the detection light deflected by the ultrasonic field at the different stations; and a processing unit, the processing unit generating a three-dimensional image of the ultrasonic field based on the image information collected at the plurality of different stations.

[0006] Exemplarily, at least the inner surface of the top wall of the container is provided with a sound absorption assembly.

[0007] Exemplarily, the container comprises a bottle body with a top opening and a first cover body detachably connected to the opening, wherein: the sound absorption assembly is arranged on the lower surface of the first cover body.

[0008] Exemplarily, the container further comprises a second cover body detachably connected to the opening, and a bottom of the second cover body is provided with a hydrophone.

[0009] Exemplarily, the sound absorption assembly is detachably connected to the first cover body, and the detection device further comprises a hydrophone detachably connected to the first cover body.

[0010] Exemplarily, the ultrasonic field detection unit is 2n-1 groups, where n is a positive integer greater than 1, in a clockwise direction, the light emitting units and the camera units of adjacent groups of the ultrasonic field detection units are arranged alternately, and the included angle between the optical axes of any adjacent groups of the ultrasonic field detection units is a predetermined value, the plurality of different stations include a first station and a second station, the second station is obtained by rotating the first station by a predetermined angle, the 2n-1 groups of ultrasonic field detection units collect first image information of detection light deflected via an ultrasonic field at the first station; the 2n-1 groups of ultrasonic field detection units collect second image information of detection light deflected via an ultrasonic field at the second station, and the image information includes the first image information and the second image information.

[0011] Exemplarily, the ultrasonic emitting unit is configured such that the emission time of each ultrasonic pulse is separated from the collection time of the ultrasonic field detection unit by the same length of time; or

[0012] The ultrasonic field detection unit is configured such that the emission time of each ultrasonic pulse is separated from the collection time of the ultrasonic field detection unit by the same length of time.

[0013] Exemplarily, the 2n-1 groups of ultrasonic field detection units are configured to simultaneously collect image information of the ultrasonic field at each station.

[0014] Exemplarily, the container is in the shape of a regular m-sided prism, m = 4n-2, and in the first station and the second station, the optical axes of the 2n-1 groups of ultrasonic field detection units are perpendicular to the side faces of the regular m-sided prism, respectively.

[0015] Exemplarily, the rotating mechanism comprises at least one group of guide rail assemblies, and at least one group of ultrasonic field detection units is correspondingly arranged on the at least one group of guide rail assemblies, each of the at least one group of guide rail assemblies comprises a first sub-guide rail and a second sub-guide rail, the light emitting unit of the corresponding group of ultrasonic field detection units is movably arranged on the first sub-guide rail, and the camera unit is movably arranged on the second sub-guide rail, and the first sub-guide rail and the second sub-guide rail are parallel to the optical axis of the corresponding group of ultrasonic field detection units.

[0016] Exemplarily, for each of the at least one group of ultrasonic field detection units: the light emitting unit comprises a light source, a beam expander, and a collimator arranged on the first sub-guide rail, and the positions of the light source, the beam expander, and the collimator along the first guide rail are adjustable.

[0017] Exemplarily, for each of the at least one group of ultrasonic field detection units: the camera unit comprises a focusing mirror and a camera arranged on the second sub-rail, and positions of the focusing mirror and the camera along the second sub-rail are adjustable.

[0018] Exemplarily, the detection device further comprises a calibration assembly having a physical scale, the calibration assembly is removably arranged in the container, the camera unit is further used to shoot calibration image information of the container with the calibration assembly and the acoustic medium, and the processing unit is further used to calibrate a relationship between the physical scale and a number of pixels in the calibration image information to measure a wavelength of the ultrasonic field.

[0019] Exemplarily, the container is in a cylindrical shape.

[0020] Another aspect of the present application provides an ultrasonic emission detection system, comprising: the above-mentioned detection device, the container being filled with the acoustic medium; and an ultrasonic emission unit, the ultrasonic emission unit being arranged on a mounting position of a bottom of the container and being placed towards a top of the container.

[0021] Therefore, by the above technical solution, the ultrasonic field emitted by the ultrasonic emitter can be detected non-destructively, so that disturbance caused by the hydrophone and other invasive detection methods can be avoided, and the detection result is more accurate. By rotating the ultrasonic field detection unit for detection, an accurate ultrasonic field image can be generated at a lower cost. The lower part of the container can be fixed, and the mounting position of the ultrasonic emission unit is arranged at the lower part of the container, so that the oscillation of the ultrasonic emission unit can be avoided from being amplified by the container. At the same time, the gravity center of the ultrasonic emission unit is lowered to make the whole device more stable.

[0022] A series of simplified forms are introduced in the utility model content, which will be further described in detail in the specific embodiment part. The utility model content part does not mean trying to limit the key features and necessary technical features of the claimed technical solution, and even less means trying to determine the protection scope of the claimed technical solution.

[0023] The advantages and features of the present application will be described in detail below in combination with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. The drawings provided in the specification and the contents of the specification form a part of the detailed description and serve to explain the present application together with the detailed description. The drawings do not limit the present application. In the drawings, the same reference numerals generally indicate the same components or steps.

[0025] Figure 1 A schematic view of a detection device according to one embodiment of the present application is shown;

[0026] Figure 2 A schematic view of the detection device according to Figure 1 A schematic view of the detection device according to

[0027] Figure 3 A schematic view of the detection device according to

[0028] In the above drawings, the following reference signs apply:

[0029] 10, ultrasonic field detection unit; 11, light emitting unit; 12, camera unit; 101, guide rail assembly; 102, rotating mechanism; 103, container; 104, sound absorbing assembly; 105, light source; 106, beam expander; 107, collimator; 108, focusing mirror; 109, camera. DETAILED DESCRIPTION

[0030] In the following description, numerous specific details are provided in order to provide a thorough understanding of the present application. One of ordinary skill in the art will readily recognize, however, that the application can be practiced without these specific details. In other instances, well-known methods, procedures and components have not been described in detail as not to unnecessarily obscure aspects of the application.

[0031] With reference to Figure 1 and Figure 2 , the present application provides a detection device for ultrasonic field. The detection device can include a container 103 for containing a sound conducting medium, and the bottom of the container 103 is provided with a mounting position for mounting an ultrasonic emitting unit. The container 103 can be made of transparent materials such as glass, acrylic, etc., which can be used to hold transparent sound conducting medium such as water, oil, ultrasonic coupling agent, etc. Ultrasonic waves can propagate in the sound conducting medium, and the sound conducting medium has uniform refractive index and no air bubbles in normal state. The ultrasonic emitting unit at least includes an ultrasonic transducer, and in some embodiments, the ultrasonic transducer and a driving unit are arranged together. The ultrasonic emitting unit can be mounted to the mounting position, and the direction of ultrasonic emission is towards the upper part of the container 103.

[0032] The detection device can further include at least one set of ultrasonic field detection units 10. Each set of ultrasonic field detection units 10 includes a light emitting unit 11 and a camera unit 12 arranged oppositely on both sides of the container 103 along an optical axis, which is orthogonal to the axis of the ultrasonic field generated by the ultrasonic generating unit. Under the action of ultrasonic waves, the refractive index distribution of the acoustic medium is uneven, and the deflection angle of the parallel light beam after passing through the liquid medium is different at different positions, forming the convergence and divergence of the light beam. The light is brighter at the convergence, and the light is dimmer at the divergence, thereby carrying the distribution information of the ultrasonic field. The light emitting unit 11 includes but is not limited to sodium lamps, xenon lamps, lasers, and other optical components, and can emit parallel light beams. The camera unit 12 can include, for example, a complementary metal oxide semiconductor (CMOS) sensor, a charge-coupled device (CCD) sensor, and other sensors that can take high-speed photos, for recording the picture after the light deflection.

[0033] The detection device can include a rotating mechanism 102, and the at least one set of ultrasonic field detection units 10 is rotatable to a plurality of different stations around the axis of the ultrasonic field under the action of the rotating mechanism 102. In some embodiments, the rotating mechanism can be driven to rotate by a corresponding angle by a driving mechanism such as a motor. Specifically, the rotating mechanism 102 can be configured as a disc, and the ultrasonic field detection units 10 can be installed on the disc. Alternatively, the rotating mechanism 102 can also be configured as a plurality of beams that are separated from each other and intersect at the rotation axis. The light emitting unit 11 is used to emit detection light at a plurality of different stations, and the camera unit 12 is used to correspondingly collect image information of the detection light deflected by the ultrasonic field at different stations. Thus, one set of ultrasonic field detection units 10 can be equivalent to a plurality of ultrasonic field detection units 10 arranged at a plurality of different stations to some extent, reducing the complexity and cost of the device. The detection device further includes a processing unit that generates a three-dimensional image of the ultrasonic field based on the image information collected at a plurality of different stations. In some embodiments, the processing unit can include a computer system such as a personal computer, a server, etc., and can also include a circuit composed of a chip such as a single-chip microcomputer, a field programmable gate array (FPGA), a digital signal processing (DSP), etc., and its peripheral elements. In some embodiments, the processing unit can also include a storage medium and a program stored therein, and the task of generating a three-dimensional image of the ultrasonic field is performed by a computer connected with the storage medium.

[0034] It should be understood that the ultrasonic field forms a three-dimensional structure in the acoustic medium, and a two-dimensional image corresponding to the ultrasonic field can be obtained from different angles, and through algorithm processing, the three-dimensional image in the ultrasonic field can be inversely deduced. Among them, various existing methods for generating a three-dimensional image based on a two-dimensional image can be used to realize the generation of a three-dimensional image of the ultrasonic field, for example, through Radon inverse transformation and tomographic reconstruction algorithm for three-dimensional reconstruction of the ultrasonic field.

[0035] Exemplarily, the image generated by the ultrasonic field is acquired by using a shadow imaging technique. The shadow imaging technique is a technique for visualizing the ultrasonic field, and the principle is that light is deflected in a gradient refractive index field, and the deflected light is projected on a screen (in this application, the imaging surface of the camera unit). The deflection of light causes the light entering the screen to be shifted in position, resulting in an uneven distribution of light intensity (shadow) on the screen.

[0036] The three-dimensional image obtained by three-dimensional reconstruction of the image information can be first calculated by calculating the minimum rotation angle and the vertical distance between the two-dimensional pixel point and the three-dimensional space point. Then, based on the minimum rotation angle and the vertical distance, the deflection angle of the two-dimensional pixel point and the Z axis is calculated. Then, the specific spatial position is calculated through the conversion formula of the two-dimensional plane and the three-dimensional space. Finally, a plurality of groups of data obtained based on the above process are fused into a three-dimensional model.

[0037] In the above steps, step 1 includes solving the value of R, h that minimizes the formula by algorithm.

[0038] wherein,

[0039] wherein, J is the Jacobian matrix, the role of J(R, h) is to define the base coordinates of the two-dimensional plane point in space; R is the rotation radius, the initial value of R is T z is the deflection vector around the Z axis, that is, the deflection of the point in space and the origin of the coordinate system, R 33 is the partial derivative of Z axis to z; h is the vertical distance between the point in space and the xoy plane, that is, the height of the Z axis, the initial value of h is 0; λ is the step radius λ = 100; δ is the trust region,

[0040]

[0041] wherein, u is the u axis, equivalent to the x axis, u i is based on the u axis (or called x axis) to carry out the partial derivative of x, y, z to u, and the multiplication of the partial derivative by X, Y, Z is the corresponding increment; v is the v axis, equivalent to the y axis, v i is based on the v axis (or called x axis) to carry out the partial derivative of x, y, z to v, and the multiplication of the partial derivative by X, Y, Z is the corresponding increment; α1, α2, α3 are the first, second and third order derivatives of the height h, which are equivalent to Taylor approximation.

[0042] After that, step 2 is performed to solve the value of β that minimizes the formula:

[0043]

[0044] wherein,

[0045] where β is the angle between the point in space and the Z axis; f c is the spatial direction cosine matrix; R 11 is the partial derivative of the u axis with respect to x, R 12 is the partial derivative of the u axis with respect to y, R 13 is the partial derivative of the u axis with respect to z; R 21 is the partial derivative of the v axis with respect to x, R 22 is the partial derivative of the v axis with respect to y, R 23 is the partial derivative of the v axis with respect to z; R 31 is the partial derivative of the z axis with respect to x, R 32 is the partial derivative of the z axis with respect to y, R 33 is the partial derivative of the z axis with respect to z; the aforementioned R 11 ~ R 33 is the elementary volume in the base coordinates, and the aforementioned partial derivatives multiplied by X, Y, and Z (or h) are the corresponding increments; T x , T y , T z are the deflection vectors of rotation around the X, Y, and Z axes, respectively, that is, the deflection of the point in space from the origin of the coordinate system.

[0046] Finally, step 3 is performed, in which the values of R, h, and β calculated in steps 1 and 2 are substituted into the formula:

[0047] X = R cos(β ± iΔθ1)

[0048] Y = R sin(β ± iΔθ2)

[0049] Z = h

[0050] where Δθ1 is the angle between the point in space and the x axis, and Δθ2 is the angle between the point in space and the y axis.

[0051] The above method of generating a three-dimensional image can improve the fault tolerance rate and generate a more reliable three-dimensional image. The generated three-dimensional image can be directly displayed via a display or the like, thereby facilitating intuitive display of whether the ultrasonic waves emitted by the ultrasonic emission unit meet the requirements and timely adjustment. In some embodiments, the generated three-dimensional image can also be stored in a USB memory, a hard disk, or the like, and viewed after testing.

[0052] Thus, by the above technical solution, the ultrasonic field emitted by the ultrasonic emitter can be detected without damage, which can avoid disturbance caused by invasive detection such as a hydrophone, and the detection result is more accurate. And by rotating the ultrasonic field detection unit 10 for detection, an accurate ultrasonic field image can be generated at a lower cost. The lower part of the container 103 can be fixed, and the installation position of the ultrasonic emission unit is set at the lower part of the container 103, which can avoid the amplification of the oscillation of the ultrasonic emission unit by the container 103. At the same time, lowering the center of gravity of the ultrasonic emission unit makes the whole device more stable.

[0053] It should be noted that the ultrasonic field can include the following parameters: sound pressure and wavelength of sound wave. Specifically, the sound pressure is positively correlated with the brightness of the stripes in the image. In the following, the relationship between the sound pressure and the image brightness when the detection device measures can be measured in advance, for example, by measuring different sound pressure values by a hydrophone, and forming a functional relationship with the image brightness. Specifically, P=k x L, where P represents the sound pressure, L represents the brightness, and k is the coefficient of sound pressure and brightness. When only the image information is collected by the camera unit 12, the actual sound pressure value can be inversely deduced by the function. The wavelength of the sound wave is related to the distance between two adjacent bright stripes in the image. By determining the correlation between the physical size in the container 103 and the pixel size of the image, the wavelength of the sound wave can be deduced according to the pixel size corresponding to the distance between two adjacent bright stripes in the image.

[0054] Exemplarily, the at least top wall inner surface of the container 103 is provided with a sound absorption assembly 104. In the embodiment where the detected ultrasonic wave divergence angle is small and only reaches the top wall of the container 103, the sound absorption assembly 104 can be arranged only on the top wall of the container 103; in some embodiments for detecting the ultrasonic field in the form of divergence, the sound absorption assembly 104 can also be arranged on the area where the ultrasonic wave can reach on the inner wall of the container 103. The sound absorption assembly 104 can absorb most of the ultrasonic waves reaching it, prevent the ultrasonic waves from reflecting back to the ultrasonic emitter, and cause the ultrasonic waves on the detection light path to superimpose, resulting in changes in the shape of the detected ultrasonic field.

[0055] Exemplarily, the container 103 comprises a top-open bottle body and a first cover body detachably connected to the opening, wherein the sound absorption assembly 104 is arranged on the lower surface of the first cover body. The top-open bottle body can facilitate the addition of the sound guide medium. Arranging the sound absorption assembly 104 on the lower surface of the first cover body can ensure that the sound absorption assembly 104 reaches the appropriate position after the cover body is installed, for example, only partially immersed in the sound guide medium, or entirely immersed in the sound guide medium under the support of the first cover body. In some embodiments, the container 103 can be marked with a liquid level line, and when the sound guide medium reaches the liquid level line, installing the first cover body can ensure that the sound guide medium is at least partially immersed in the sound guide medium and does not overflow due to the sound absorption assembly 104. In this way, the process of installing the sound absorption assembly 104 can be simplified, the sound absorption assembly 104 will not fall to the bottom of the container 103, and the installed form is guaranteed.

[0056] Exemplarily, the container 103 can further comprise a second cover body detachably connected to the opening, and the bottom of the second cover body is provided with a hydrophone. In this way, the user can simply replace the first cover body provided with the sound absorption assembly 104 with the second cover body provided with the hydrophone when it is necessary to detect physical quantities such as sound pressure. The position of the hydrophone installed in the second cover body can also be calibrated, so that the hydrophone can directly reach the measurement position when the second cover body is installed in place without the need for further calibration. In some embodiments, the first cover body and the second cover body can also be provided with adjustment mechanisms such as differential heads, which can fine-tune the position of the sound absorption assembly 104 or the hydrophone without detaching the first cover body or the second cover body when the first cover body and the second cover body are installed in place.

[0057] In some embodiments, the sound absorption material can be directly inserted into the second cover body, which can reduce the cost of detection and facilitate operation.

[0058] In some embodiments, the sound absorption assembly 104 is detachably connected to the first cover body, and the detection device further comprises a hydrophone detachably connected to the first cover body. In this way, only one cover body can be used, and different measurements can be performed by simply replacing the assembly installed on the first cover body. This scheme is particularly suitable for embodiments in which the first cover body is provided with a fine-tuning structure, which can effectively reduce the cost.

[0059] Exemplarily, the ultrasonic field detection unit 10 is 2n-1 groups, where n is a positive integer greater than 1. Along the clockwise direction, the light-emitting units 11 and the camera units 12 of the adjacent groups of ultrasonic field detection units 10 are arranged alternately. As shown in FIG. 1, the ultrasonic field detection unit 10 can be 3 groups, and in an embodiment not shown, the ultrasonic field detection unit 10 can also be 5, 7, 9, etc. Figure 3

[0060] ​Since each group of ultrasonic field detection units includes the light emitting unit 11 and the camera unit 12, which are respectively arranged on both sides of the container 103, if an even number of ultrasonic field detection units are arranged, uniform intervals cannot be formed between the groups of ultrasonic field detection units. Specifically, if an even number of groups of ultrasonic field detection units, for example, four groups, are arranged, with one group of ultrasonic field detection units rotated by 90 degrees, the last group of ultrasonic field detection units will overlap the first group of ultrasonic field detection units and cannot be arranged, and only at least one group of ultrasonic field detection units can have an included angle between adjacent groups of ultrasonic field detection units that is different from the included angle between other adjacent groups of ultrasonic field detection units. As described above, in the case of three groups of ultrasonic field detection units, the next group of ultrasonic field detection units can be arranged with a rotation of 120 degrees from one group of ultrasonic field detection units as a reference. In another embodiment, in the case of five groups of ultrasonic field detection units, the next group of ultrasonic field detection units can be arranged with a rotation of 72 degrees from one group of ultrasonic field detection units as a reference, and so on. In this way, only a corresponding angle needs to be rotated, and the area swept by the optical axis of each group of ultrasonic field detection units can be 1 / (2n-1) x 360 degrees, and the area swept by the optical axis of the groups of ultrasonic field detection units can cover the entire circumference of the container 103.

[0061] With continued reference to Figure 3Since the ultrasonic field detection units have two parts symmetric about the container, the included angle between any two adjacent groups of the three groups of ultrasonic field detection units 10 is 60 degrees. When the first group of ultrasonic field detection units 10 is rotated by 60 degrees, it is in the original position of the second group of ultrasonic field detection units 10, and the direction of shooting is opposite to the direction of shooting of the second group of ultrasonic field detection units originally in this position. When it continues to rotate by 60 degrees, it is in the original position of the third group of ultrasonic field detection units 10, and the direction of shooting is the same as the direction of shooting of the third group of ultrasonic field detection units originally in this position. In one specific embodiment, the ultrasonic field detection units 10 are arranged in three groups, and the ultrasonic field detection units 10 can be rotated by 30 degrees, 60 degrees, and 90 degrees from the initial position. The three groups of ultrasonic field detection units can take a total of 12 images around the container 103. In the embodiment with only one group of ultrasonic field detection units, one group of ultrasonic field detection units takes an image every 30 degrees from the initial position until it rotates a full circle. The smaller the angle of rotation of the ultrasonic field detection units 10 each time, the more images can be taken, and the higher the accuracy of the model established. In some exemplary embodiments, the included angle between adjacent ultrasonic field detection units is an integer multiple of the angle of rotation of the ultrasonic field detection units each time. For example, the included angle between adjacent ultrasonic field detection units 10 is 60 degrees, and the ultrasonic field detection units 10 can be rotated by 10 degrees each time from the initial position for shooting until they are rotated by 120 degrees. In this way, the images taken are more evenly around the container 103, avoiding distortion of the model established. The ultrasonic detection device thus designed has a relatively centered gravity center, and only a small counterweight or no counterweight needs to be provided, and the structure is simple. The images collected are also easier to sort, facilitating subsequent processing.

[0062] For example, the included angle between the optical axes of any two adjacent groups of ultrasonic field detection units is a predetermined value. The plurality of different stations include a first station and a second station, and the second station is obtained by rotating the first station by a predetermined angle. In Figure 3 In the embodiment shown, the predetermined value is 60 degrees, and in the second station, the shooting direction of the three groups of ultrasonic field detection units is reversed. For example, the ultrasonic field detection unit in the horizontal direction, the optical path in the first station is from left to right, and in the second station, the optical path of the ultrasonic field detection unit in the horizontal direction is from right to left.

[0063] The 2n-1 groups of ultrasonic field detection units collect first image information of the detection light deflected by the ultrasonic field in the first station; and the 2n-1 groups of ultrasonic field detection units collect second image information of the detection light deflected by the ultrasonic field in the second station. The image information includes the first image information and the second image information. Thus, a total of 4n-2 groups of images can be obtained, which are equivalent to being taken at multiple angles around the container.

[0064] Exemplarily, the container 103 is in the shape of a regular m-agon prism, m = 4n - 2. In the first and second stations, the optical axes of 2n - 1 groups of the ultrasonic field detection units 10 are perpendicular to the side faces of the regular m-agon prism, respectively. When the light-emitting units 11 irradiate onto the container 103, the light can be prevented from being refracted at the corners of the container 103 as much as possible, so as to avoid the distortion of the obtained images. Exemplarily, the container 103 is in the shape of a cylinder. The cylinder can be regarded as a regular m-agon with m being infinite. The light entering the container 103 can only be refracted unexpectedly due to the unevenness of the material of the container 103, so as to cause the distortion of the images collected by the ultrasonic field detection units 10. Since the cylinder container 103 and the acoustic medium itself can form a lens, the optical elements included in the camera unit 12 can be adjusted accordingly, for example, the focusing mirror 108 mentioned below.

[0065] Exemplarily, the ultrasonic emitting unit is configured such that the emission time of each ultrasonic pulse is separated from the collection time of the ultrasonic field detection unit by the same length of time, or the ultrasonic field detection unit is configured such that the collection time is separated from the emission time of the ultrasonic pulse of the ultrasonic emitting unit by the same length of time. In other words, in the case where the collection time of the ultrasonic field detection unit is determined, the emission time of the ultrasonic pulse can be adjusted, and vice versa. Alternatively, the two are separated by a delay module, and after sending a trigger signal to the ultrasonic field detection unit, the trigger signal is sent to the ultrasonic field detection unit after a certain time delay. After receiving the trigger signal, the ultrasonic emitting unit emits an ultrasonic pulse, and then the ultrasonic field detection unit starts collecting after receiving the trigger signal. Alternatively, the trigger signals sent to the two are simultaneous, and the trigger signals are sent to the two when the ultrasonic field detection unit reaches the station each time.

[0066] Since the ultrasonic pulse is an ultrasonic wave, it will propagate in the acoustic medium from the start of emission. Therefore, the difference in collection time can cause the collected images to be different due to the propagation of the ultrasonic wave when the ultrasonic field detection unit collects the images. For example, the image collected at the first time, a certain position corresponds to the wave crest of the ultrasonic wave in the acoustic medium, and the image collected at the second time, the same position corresponds to the wave trough of the ultrasonic wave in the acoustic medium. This can cause the three-dimensional model obtained by processing the images to be distorted.

[0067] Generally, the state of the ultrasound wave at the same position in the acoustic medium is the same at the same time when the ultrasound emission unit emits the ultrasound wave each time. Specifically, for example, a wave peak is formed at the position 1 cm away from the ultrasound emission unit when the ultrasound emission unit emits an ultrasound pulse each time for 1 ms. This is related to the response delay of the ultrasound emission unit and the frequency of the ultrasound wave. However, for the same ultrasound emission unit, the above requirement should be met without changing the position of the ultrasound emission unit. Since the ultrasound field detection unit needs to be rotated to the second station to collect image information, the delay in the rotation process cannot be avoided. Therefore, it is impossible for the ultrasound emission unit to emit an ultrasound pulse each time, that is, to collect all the images required for three-dimensional modeling. In order to ensure the accuracy of the three-dimensional modeling image as much as possible, after the ultrasound emission unit emits an ultrasound pulse, the ultrasound field detection unit collects image information at the first time interval at the first station. After the ultrasound field detection unit is rotated to the second station and is in place, the ultrasound emission unit can re-emit an ultrasound pulse, and image information is collected at the same first time interval after the emission of the ultrasound pulse begins. In some embodiments, the first time interval can be 0 ms, 1 ms, 2 ms, etc. In some embodiments, the ultrasound field in the acoustic medium is stable after the ultrasound emission unit emits an ultrasound pulse for the first time interval. Thus, the obtained image can make the three-dimensional modeling more accurate.

[0068] Exemplarily, the 2n-1 groups of ultrasound field detection units are configured to simultaneously collect image information of the ultrasound field at each station. Alternatively, the trigger signal lines of the ultrasound field detection units can be connected together, and when a trigger signal for collecting image information of the ultrasound field is received, the collection can be started simultaneously. Alternatively, each ultrasound field detection unit can be provided with a wireless receiver, and when the transmitter issues a collection instruction, each ultrasound field detection unit simultaneously receives the information for starting collection and starts collecting images. Thus, it can be avoided that different ultrasound field detection units collect image information of the ultrasound field at different times, resulting in distortion of the three-dimensional modeling.

[0069] Exemplarily, the rotating mechanism 102 includes at least one group of guide rail assemblies 101, and at least one group of ultrasound field detection units 10 is correspondingly arranged on the at least one group of guide rail assemblies 101. Each of the at least one group of guide rail assemblies 101 includes a first sub-guide rail and a second sub-guide rail, and the light emitting unit 11 of the corresponding group of ultrasound field detection units 10 is movably arranged on the first sub-guide rail, and the camera unit 12 is movably arranged on the second sub-guide rail, and the first sub-guide rail and the second sub-guide rail are both parallel to the optical axis of the corresponding group of ultrasound field detection units 10.

[0070] In some embodiments, a sliding block can be arranged on the guide rail assembly, and the light emitting unit and the camera unit are arranged on the sliding block. The sliding block can slide along the guide rail assembly, so that the light emitting unit and the camera unit move along the optical axis. The sliding block can include a locking member, so as to avoid the position of the light emitting unit and the camera unit moving along the optical axis during the measurement process and the rotation process of the rotating mechanism.

[0071] Since the optical system has strict requirements on the distance between each optical element on the optical axis, taking the camera unit 12 as an example, the distance between the camera unit 12 and the container 103 can affect the imaging effect, such as poor focusing, or the image taken is zoomed or distorted. Especially for the cylindrical container 103, the parallel light emitted by the light emitting unit 11 converges through the cylindrical container 103 and the sound-conducting medium therein, and the light beam emitted from the container 103 is not parallel light. The camera unit 12 needs to maintain a proper distance to ensure the accuracy of the collected image. In an exemplary embodiment, the container 103 is fixedly arranged, and the distance between the light emitting unit 11, the camera unit 12 and the container 103 can be adjusted by the guide rail assembly 101 to ensure the accuracy of the collected image. In some embodiments, the guide rail assembly 101 is arranged above or below the container 103, so as not to contact the container 103 when following the rotation of the rotating mechanism 102. In other embodiments, the guide rail assembly 101 can be constructed as two sections spaced from each other, and the container 103 is arranged in the gap between the two sections of the guide rail assembly 101. In yet other embodiments, the guide rail assembly 101 can extend on one side of the container 103. In summary, during the rotation of the rotating mechanism 102, the fixed container 103 is not contacted, and the optical axis of the light emitting unit 11 and the camera unit 12 arranged on the guide rail assembly 101 always passes through the container 103, and the distance between the light emitting unit 11 and the container 103 and the distance between the camera unit 12 and the container 103 are always constant.

[0072] In the case of arranging multiple groups of ultrasonic field detection units 10, by arranging the guide rail assembly 101 corresponding to each group of ultrasonic field detection units 10, the light emitting unit 11 and the camera unit 12 of the ultrasonic field detection unit 10 on each guide rail assembly 101 can be independently adjusted. For multiple groups of ultrasonic field detection units 10 using the same light emitting unit 11 and camera unit 12, by adjusting the positions of the light emitting unit 11 and the camera unit 12, the distance between the light emitting unit 11 and the container 103 in each group is the same, and the distance between the camera unit 12 and the container 103 is also the same, so as to ensure that the three-dimensional model established is more accurate. Of course, when there is a consistency difference between different groups of light emitting units 11 and camera units 12, the distance can also be adjusted slightly according to the actual situation.

[0073] Exemplarily, for each of the at least one group of ultrasonic field detection units 10, the light emitting unit 11 comprises a light source 105, an expander mirror 106 and a collimator mirror 107 disposed on a first sub-guide rail, and the positions of the light source 105, the expander mirror 106 and the collimator mirror 107 along the first sub-guide rail are adjustable. As described above, in some embodiments, the first sub-guide rail and the second sub-guide rail below can be spaced apart with respect to the container 103. In other embodiments, the first sub-guide rail and the second sub-guide rail can also be connected to each other. By changing the distance between the expander mirror 106, the collimator mirror 107 and the light source 105, the light emitted by the light source 105 can be adjusted to be parallel light of a suitable size. For multiple groups of ultrasonic field detection units 10, the parallel light emitted by each group of light emitting units 11 can be adjusted to have the same size by adjusting the three, thereby ensuring the accuracy of three-dimensional modeling.

[0074] Exemplarily, for each of the at least one group of ultrasonic field detection units 10, the camera unit 12 comprises a focusing mirror 108 and a camera 109 disposed on a second sub-guide rail, and the positions of the focusing mirror 108 and the camera 109 along the second sub-guide rail are adjustable. Similar to the adjustment of the light emitting unit 11, the adjustment of the focusing mirror 108 and the camera 109 can make the imaging effect optimal. In embodiments where there are multiple groups of ultrasonic field detection units 10, each camera 109 can be made to have the same zoom size and have optimal imaging effect, so as to reduce the difficulty of processing the images later.

[0075] Exemplarily, the detection device further comprises a calibration assembly having a physical scale, the calibration assembly being removably disposed in the container 103, and the camera unit 12 is further configured to capture calibration image information of the container 103 with the calibration assembly and the acoustic medium, and the processing unit is further configured to calibrate the relationship between the physical scale and the number of pixels in the calibration image information to measure the wavelength of the ultrasonic field. In a specific embodiment, the scale is imaged 1:1 on the imaging surface of the camera unit 12. If the pixels on the imaging surface have a spacing of, for example, 75 um, then the interval between two objects on the captured image can be determined to be n pixels, and the physical interval between the two objects is n x 75 um. The image on the imaging surface is usually linear with the actual physical size, so that the image and the physical size can be one-to-one corresponding according to the scaling ratio. In embodiments where the scaling ratio is different in different regions of the image, the scaling can also be corrected by software. For multiple groups of ultrasonic field detection units 10, the images captured by the camera unit 12 can have different scaling ratios. The position of the camera unit 12 can be adjusted according to the correspondence between the pixels of each image and the scale size, or the scaling can be performed on the software, to ensure that there is no distortion when three-dimensional modeling.

[0076] In some embodiments, the ultrasonic emission unit is composed of a function generator, a power amplifier, and an ultrasonic transducer. The function generator outputs a specified pulse signal, and the pulse signal is amplified by the power amplifier to excite the ultrasonic transducer to generate ultrasonic waves.

[0077] Another aspect of the present application provides an ultrasonic emission detection system, which comprises the above-mentioned detection device and an ultrasonic emission unit. The container is filled with an acoustic medium, and the ultrasonic emission unit is placed on the mounting position at the bottom of the container and faces the top of the container. In this way, the ultrasonic field emitted by the ultrasonic emission unit can be three-dimensionally modeled, and the performance of the ultrasonic emission unit can be more intuitively displayed.

[0078] In the description of the present application, it should be understood that the orientation words such as "front", "back", "up", "down", "left", "right", "transverse", "vertical", "vertical", "horizontal", and "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner" and "outer" refer to the inner and outer of the contour of each component itself.

[0079] For the convenience of description, regional relative terms such as "on", "above", "upper surface", "upper" and the like can be used herein to describe the regional positional relationship of one or more components or features shown in the drawings with other components or features. It should be understood that the regional relative terms not only include the orientation of the components described in the drawings, but also include different orientations in use or operation. For example, if the components in the drawings are inverted as a whole, the components "above" or "on" other components or features will include the case of "below" or "under" other components or features. Therefore, the exemplary term "above" can include both "above" and "below". In addition, these components or features can also be positioned at other different angles (for example, rotated by 90 degrees or other angles), and all these cases are intended to be included herein.

[0080] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, component, assembly and / or combination thereof.

[0081] It should be noted that the terms "first", "second", and the like used in the description and the claims of the present application as well as the above-described figures are used to distinguish similar objects and are not necessarily intended to describe a particular sequential or chronological order. It is to be understood that data so used can be interchanged, where appropriate, so that the embodiments of the present application described herein can be carried out in other than the order shown or described herein.

[0082] The present application has been described by the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and illustration, and are not intended to limit the present application to the scope of the described embodiments. Furthermore, those skilled in the art can understand that the present application is not limited to the above-mentioned embodiments, and more various modifications and modifications can be made according to the teachings of the present application, which all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalent scope.

Claims

1. An apparatus for detecting an ultrasonic field, characterized by comprising: The detection device comprises: a container for accommodating a sound-guiding medium, a bottom of the container being provided with a mounting position for mounting an ultrasonic emission unit; at least one set of ultrasonic field detection units, each set of the ultrasonic field detection units comprising a light-emitting unit and a camera unit oppositely arranged on two sides of the container along an optical axis, the optical axis being orthogonal to an axis of an ultrasonic field generated by the ultrasonic emission unit; a rotating mechanism, the at least one set of ultrasonic field detection units being rotatable to a plurality of different stations around the axis of the ultrasonic field under the action of the rotating mechanism, the light-emitting unit being configured to emit detection light at the plurality of different stations, and the camera unit being configured to correspondingly collect image information of the detection light deflected by the ultrasonic field at different stations; and a processing unit configured to generate a three-dimensional image of the ultrasonic field based on the image information collected at the plurality of different stations.

2. The detection device of claim 1, wherein: at least an inner surface of a top wall of the container is provided with a sound absorption assembly. The container comprises a bottle body with a top opening and a first cover body detachably connected to the opening, and wherein:

3. The detection device of claim 2, wherein, the sound absorption assembly is arranged on a lower surface of the first cover body.

4. The detection device of claim 3, wherein: the container further comprises a second cover body detachably connected to the opening, a bottom of the second cover body being provided with a hydrophone; or the sound absorption assembly is detachably connected to the first cover body, and the detection device further comprises a hydrophone detachably connected to the first cover body.

5. The detection device of claim 1, wherein: the ultrasonic field detection units are 2n-1 sets, where n is a positive integer greater than 1, in a clockwise direction, the light-emitting units and the camera units of adjacent sets of the ultrasonic field detection units are alternately arranged, and the included angle between the optical axes of any adjacent sets of the ultrasonic field detection units is a predetermined value, the plurality of different stations comprises a first station and a second station, the second station being obtained by rotating the first station by the predetermined angle, 2n-1 sets of the ultrasonic field detection units collect first image information of the detection light deflected by the ultrasonic field at the first station, and 2n-1 sets of the ultrasonic field detection units collect second image information of the detection light deflected by the ultrasonic field at the second station, the image information comprising the first image information and the second image information.

6. The detection device of claim 5, wherein: the ultrasonic emission unit is configured such that each emission time of an ultrasonic pulse is separated from each collection time of the ultrasonic field detection units by the same time length; or the ultrasonic field detection units are configured such that each collection time is separated from each emission time of an ultrasonic pulse of the ultrasonic emission unit by the same time length. 2n-1 sets of the ultrasonic field detection units are configured to simultaneously collect image information of the ultrasonic field at each of the stations.

7. The detection device of claim 5, wherein, the container is in the shape of a regular m-sided prism, m = 4n-2, 8. The detection device of claim 5, wherein, in the first station and the second station, the optical axes of 2n-1 sets of the ultrasonic field detection units are respectively perpendicular to the side faces of the regular m-sided prism. ​ 9. The detection device of claim 1, wherein, The rotating mechanism comprises at least one set of guide rail assemblies, and the at least one set of ultrasonic field detection units are correspondingly arranged on the at least one set of guide rail assemblies, Each of the at least one set of guide rail assemblies comprises a first sub-guide rail and a second sub-guide rail, the light emitting unit of the corresponding set of ultrasonic field detection units is movably arranged on the first sub-guide rail, and the camera unit is movably arranged on the second sub-guide rail, and the first sub-guide rail and the second sub-guide rail are both parallel to the optical axis of the corresponding set of ultrasonic field detection units.

10. The detection device of claim 9, wherein, For each of the at least one set of ultrasonic field detection units: The light emitting unit comprises a light source, a beam expander and a collimator arranged on the first sub-guide rail, and the positions of the light source, the beam expander and the collimator along the first sub-guide rail are adjustable; and / or The camera unit comprises a focusing lens and a camera arranged on the second sub-guide rail, and the positions of the focusing lens and the camera along the second sub-guide rail are adjustable.

11. The detection device of claim 1, wherein, Further comprising a calibration assembly having a physical scale, the calibration assembly is removably arranged in the container, and the camera unit is further used to capture calibration image information of the container with the calibration assembly and the acoustic medium, and the processing unit is further used to measure the wavelength of the ultrasonic field based on the calibration image information.

12. The detection device of claim 1, wherein, The container is in the shape of a cylinder.

13. An ultrasonic emission detection system characterized by, It comprises: The detection device according to any one of claims 1-12, the container is filled with an acoustic medium; and An ultrasonic emitting unit is arranged on the mounting position at the bottom of the container and faces the top of the container.

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