Laser-induced acoustic imaging mechanism and underwater detection equipment

Abstract

The utility model relates to a laser-induced acoustic imaging mechanism and underwater detection equipment, and the laser-induced acoustic imaging mechanism comprises a laser emission assembly, a focus lens array, a collection assembly and a control assembly. After laser beams are generated by using the laser emission assembly, the laser beams are converted into acoustic laser beams according to switch structures of the focus lens array, a sound field is generated, echo signals are collected through the collection assembly, the echo signals are further analyzed through the control assembly, detection information of the underwater environment is obtained, and the underwater environment is judged. The acoustic wave propagation speed in water is relatively high, the propagation range is wider, and the underwater environment influence is small, so that the underwater environment can be accurately detected, and the underwater environment can be comprehensively detected.

Description

Technical Field

[0001] The present application relates to the technical field of underwater detection equipment, and in particular to a laser acoustic imaging mechanism and underwater detection equipment. Background Art

[0002] With the development and progress of science and technology, more and more technical means have emerged in the fields of marine science, underwater archaeology, and seabed resource detection, and more and more corresponding equipment has been developed. Underwater detection technology has broad application prospects.

[0003] At present, underwater optical detection technology uses the method of directly emitting light beams to illuminate the target. Since water is a scattering medium, when using light beams for detection, the light propagates in the water and is affected by absorption and scattering. The effect of collecting the reflected light beam is greatly disturbed, resulting in a limited detection distance of the light beam, which in turn leads to a small collection range and cannot meet the requirements of large-scale comprehensive detection of underwater environments.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0005] The purpose of this application is to overcome the deficiencies of the above-mentioned prior art and to provide a laser-induced acoustic imaging mechanism and underwater detection equipment, which emit a combined laser beam in a certain coded form underwater to generate a sound field, detect the underwater environment, meet the needs of long-distance detection, and realize large-scale and comprehensive detection of the underwater environment.

[0006] According to one aspect of the present application, a laser acoustic imaging mechanism is provided, comprising: a laser emitting component, a focusing mirror array, a collection component and a control component, wherein the laser emitting component comprises an emitting source for emitting a laser beam; the focusing mirror array comprises a plurality of focusing mirrors arranged in an array and facing the emitting source, each of the focusing mirrors being provided with a switch structure, the laser beam passing through the focusing mirror array to form an acoustic laser beam; the collection component is used to collect an echo signal generated after the acoustic laser beam is emitted; the emitting source, each of the switch structures and the collection component are all electrically connected to the control component.

[0007] According to some embodiments of the present application, the distances between adjacent focusing mirrors are equal.

[0008] According to some embodiments of the present application, a plurality of different sets of two-dimensional image information are preset in the control component to control the plurality of focusing mirrors to form a modulated light field having a corresponding two-dimensional image.

[0009] According to some embodiments of the present application, the power density of the laser beam is greater than the light breakdown power density of the water body.

[0010] According to some embodiments of the present application, the wavelength λ of the laser beam ranges from 266 nanometers to 10.8 micrometers.

[0011] According to some embodiments of the present application, the pulse width of the laser beam is between 1 femtosecond and 1 millisecond.

[0012] According to some embodiments of the present application, the control component controls the switching structure to perform switching at a frequency that is a switching frequency, and the switching frequency is synchronized with a repetition frequency of the laser beam.

[0013] According to some embodiments of the present application, the laser acoustic imaging mechanism also includes a direction adjustment component, which includes a fixedly connected reflector and a movable seat, the movable seat is electrically connected to the control component, and the reflector is located in the light emitting direction of the focusing mirror array.

[0014] According to some embodiments of the present application, the collection component includes an electrically connected collector and an acoustic sensor, and the acoustic sensor is electrically connected to the control component.

[0015] According to one aspect of the present application, an underwater detection device is provided, wherein the detection device includes the laser acoustic imaging mechanism as described above.

[0016] The present application provides a laser-induced acoustic imaging mechanism and underwater detection equipment, wherein the laser-induced acoustic imaging mechanism comprises: a laser emitting component, a focusing mirror array, a collection component and a control component, wherein the laser emitting component comprises an emitting source for emitting a laser beam; the focusing mirror array comprises a plurality of focusing mirrors arranged in an array combination and facing the emitting source, each focusing mirror is provided with a switch structure, and the laser beam passes through the focusing mirror array to form an acoustic laser beam; the collection component is used to collect the echo signal generated after the acoustic laser beam is emitted; the emitting source, each switch structure and the collection component are all electrically connected to the control component. After the laser beam is generated by the laser emitting component, the laser beam is converted into an acoustic laser beam according to each switch structure of the focusing mirror array, that is, a combined laser beam in a certain coded form is emitted underwater, and a sound field is generated, and then the echo signal is collected by the collection component, and the echo signal is further analyzed by the control component to obtain the detection information of the underwater environment and judge the underwater environment; the propagation speed of sound waves in water is relatively fast, the propagation range is wider, and it is less affected by the underwater environment, so that accurate detection of the underwater environment can be achieved, and large-scale and comprehensive detection of the underwater environment can be achieved.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic structural diagram of a laser acoustic imaging mechanism provided in an embodiment of the present application is shown;

[0020] Figure 2 Shows Figure 1 Schematic diagram of the architecture of the laser acoustic imaging mechanism.

[0021] The above drawings contain the following reference numerals:

[0022] 10. Laser emission component; 11. Emission source; 20. Focusing mirror array; 21. Focusing mirror; 30. Collection component; 31. Collector; 32. Acoustic sensor; 40. Control component; 50. Direction adjustment component; 51. Reflector; 52. Movable seat. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0024] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0025] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0026] like Figure 1 and Figure 2 As shown, in the first aspect, the technical solution of the embodiment of the present application provides a laser acoustic imaging mechanism, including: a laser emitting component 10, a focusing mirror array 20, a collection component 30 and a control component 40, the laser emitting component 10 includes a transmitting source 11 for emitting a laser beam; the focusing mirror array 20 includes a plurality of focusing mirrors 21 arranged in an array combination facing the transmitting source 11, each focusing mirror 21 is provided with a switch structure, and the laser beam passes through the focusing mirror array 20 to form an acoustic laser beam; the collection component 30 is used to collect the echo signal generated after the acoustic laser beam is emitted; the transmitting source 11, each switch structure and the collection component 30 are electrically connected to the control component 40.

[0027] After the laser beam is generated by the laser emitting component 10, the laser beam is converted into an acoustic laser beam according to the switch structures of the focusing mirror array 20, that is, a combined laser beam in a certain coded form is emitted underwater to generate a sound field, and then the echo signal is collected by the collection component 30, and the echo signal is further analyzed by the control component 40 to obtain the detection information of the underwater environment and judge the underwater environment; the propagation speed of sound waves in water is relatively fast, the propagation range is wider, and it is less affected by the underwater environment, so that accurate detection of the underwater environment can be achieved, and large-scale comprehensive detection of the underwater environment can be achieved.

[0028] It should be noted that the technical solution of the embodiment of the present application, which generates sound waves or sound fields by directing an acoustic laser beam toward the water body, has the advantages of cross-medium detection, strong detection maneuverability, and high positioning accuracy, and is more suitable for marine science, underwater archaeology, and seabed resource detection.

[0029] Furthermore, in the technical solution of this embodiment, a plurality of emission sources 11 are provided in the laser emission assembly 10 for emitting combined laser beams of different frequencies, different wavelengths and different spectral widths, which is helpful for emitting a laser beam that is more suitable for the target object.

[0030] like Figure 1 As shown, in the technical solution of this embodiment, the distances between adjacent focusing mirrors 21 are equal. The focusing mirror array 20 formed by such an arrangement has a regularity, can satisfy the two-dimensional information change, and makes the shape of the acoustic laser beam easier to control. Further, a plurality of focusing mirrors 21 are combined to form a laser beam modulated light field of an inherent shape. Along the direction perpendicular to the laser beam intake, the specific shape of the cross section of the focusing mirror array 20 can be square, circular, or polygonal. In a preferred embodiment, the specific shape of the cross section of the focusing mirror array 20 can be square, and the plurality of focusing mirrors 21 inside it are arranged in an 8×8 array.

[0031] In the technical solution of this embodiment (not shown in the figure), a plurality of different sets of two-dimensional image information are preset in the control component 40 to control the plurality of focusing mirrors 21 to form a modulated light field with a corresponding two-dimensional image. The preset plurality of different sets of two-dimensional image information can control the plurality of focusing mirrors 21 to combine, and form the required acoustic laser beam after modulating the laser beam. The two-dimensional image information can be a random two-dimensional 1 or 0 distribution pattern. These generated two-dimensional patterns are generated based on the simulated random generation of the control component 40 to ensure the uniqueness of each pattern.

[0032] The control component 40 controls the switch structure in the focusing mirror 21 to open or close according to the 1 or 0 information in these patterns, thereby realizing the control of the modulated light field. In this way, the distribution and intensity of the laser light field can be accurately controlled, providing strong support for the subsequent sound wave generation and imaging. The number, units and distribution of the focusing mirrors 21 in the focusing mirror array 20 need to match the two-dimensional 0 or 1 distribution pattern to ensure that the laser beam can be accurately focused and generate the expected sound wave signal after modulation.

[0033] In the technical solution of this embodiment (not shown in the figure), the power density of the laser beam is greater than the light breakdown power density of the water body. After the acoustic laser beam is shot at the water body, each point in it will be focused in the water, and the laser power density is greater than the light breakdown power density of the water body, so sound waves will be generated at the focus point. These sound waves propagate in the water, forming a modulated sound field, carrying rich information about the target object. Thereby achieving the purpose of laser acoustics, generating sound waves underwater for detection.

[0034] In the technical solution of the present embodiment (not shown in the figure), the wavelength λ of the laser beam ranges from 266 nanometers to 10.8 microns. The laser beam is a laser of a specific band, and its wavelength range covers from blue light to far infrared band. The specific wavelength can be set to the range of 266 nanometers to 10.8 microns according to the actual application requirements. Such wavelength selection makes it easier to obtain high-power lasers to ensure that the power density of the laser is greater than the light breakdown power density of the water body, so as to generate sufficient acoustic wave signals in the water. The wavelength of the laser can be flexibly adjusted according to actual needs to meet the needs of different application scenarios. Preferably, when performing underwater operations, laser beams other than 450mn to 550nm wavelengths, in which water absorbs less light, can be selected.

[0035] In the technical solution of this embodiment (not shown in the figure), the pulse width of the laser beam is between 1 femtosecond and 1 millisecond. Such a setting can achieve high-precision light field modulation.

[0036] In the technical solution of this embodiment (not shown in the figure), the control component 40 controls the switching structure to switch at a switching frequency, and the switching frequency is synchronized with the repetition frequency of the laser beam. Such a setting ensures the synchronization of laser emission and switch control, accurately controls the repetition frequency of the laser, and the output acoustic laser beam can be more accurate and stable.

[0037] Specifically, the switching frequency can utilize the signal synchronization device built into the control component 40 to accurately control the repetition frequency of the laser so that it is completely consistent with the switching frequency of the switch structure.

[0038] like Figure 1 As shown, in the technical solution of this embodiment, the laser acoustic imaging mechanism also includes a direction adjustment component 50, which includes a fixedly connected reflector 51 and a movable seat 52, the movable seat 52 is electrically connected to the control component 40, and the reflector 51 is located in the light emitting direction of the focusing lens array 20. The direction adjustment component 50 is used to emit laser beams in different directions of the water body, thereby meeting the requirements of comprehensive detection. The movable seat 52 can specifically be a rotatable round table with a lifting function, and the reflective surface of the reflector 51 is set at an angle to the direction of the acoustic laser beam. When the movable seat 52 drives the reflector 51 to move, the angle between the reflective surface and the direction of the acoustic laser beam changes, thereby realizing the emission of the acoustic laser beam.

[0039] The function of the reflector 51 is to direct the modulated acoustic laser beam in a specific direction so that it can accurately illuminate the target object in the water. By precisely controlling the angle and position of the reflector 51, it can be ensured that the light field covers the target area and generates sufficient acoustic wave signals.

[0040] Specifically, after the acoustic laser beam passes through the reflector 51, a single beam of the acoustic laser beam will focus in the water to generate acoustic waves, and the acoustic waves generated by multiple beams will combine to form a modulated acoustic field. Due to the focusing effect of the acoustic laser beam, each acoustic laser beam will form a focal point in the water, and these focal points will generate acoustic waves through nonlinear optical effects. These acoustic waves propagate in the water and carry information about the target object. By adjusting the modulation method and parameters of the light field, the characteristics and propagation range of the acoustic wave signal can be controlled.

[0041] It should be noted that the sonic laser beam interacts with matter. When the sonic laser beam is irradiated on the surface of a material, its photons interact with the molecules of the material, causing the molecules to vibrate, thereby generating sound waves or sound fields. The mechanism of generating sound waves or sound fields is that the laser energy is absorbed by the material and converted into heat energy, causing the local temperature of the material to rise, resulting in thermoelastic expansion, which will further generate sound waves or sound fields. Therefore, these focal points generate sound waves through nonlinear optical effects.

[0042] like Figure 1 As shown, in the technical solution of this embodiment, the collection component 30 includes an electrically connected collector 31 and an acoustic sensor 32, and the acoustic sensor 32 is electrically connected to the control component 40. The collector 31 is specifically an acoustic signal collector, which is used to collect the echo signal returned by the target and transmit it to the acoustic sensor 32.

[0043] Specifically, the acoustic signal collector is a device specially designed to capture underwater acoustic wave signals, which has high sensitivity and wide-band response characteristics. Once the acoustic signal returned by the target is collected, the collector will quickly transmit it to the acoustic sensor 32 for further processing.

[0044] The acoustic signal collector is responsible for collecting the acoustic signal returned by the target object and transmitting it to the acoustic sensor for processing. The acoustic sensor 32 can convert the acoustic wave signal into an electrical signal and transmit it to the control component 40 for subsequent data analysis and processing. Through this step, a one-dimensional intensity signal about the target object can be obtained to provide data support for subsequent image reconstruction.

[0045] In the technical solution of this embodiment (not shown in the figure), after receiving the electrical signal transmitted by the acoustic sensor 32, the control component 40 starts to process the series of one-dimensional intensity signals, synchronously matches these signals with a series of preset two-dimensional 0 or 1 distribution 8×8 array patterns, and reconstructs the image of the target object through a complex correlation calculation algorithm. Through this step, clear imaging of underwater long-distance targets can be achieved, providing strong technical support for practical applications.

[0046] The technical solution of this embodiment uses the principle of underwater laser-induced sound, and specifically achieves long-distance clear imaging of underwater targets through a series of steps such as laser emission, light field modulation, sound wave generation, signal acquisition and image reconstruction. This technology not only overcomes the limitations of traditional underwater imaging technology, but also has broad application prospects.

[0047] It should be noted that after the sonic laser beam enters the water body, it will generate sound waves. Through the interaction between the sound waves and underwater objects, the underwater environment can be detected. The specific principle is: the sonic laser beam interacts with the molecules in the water. When the sonic laser beam irradiates the surface of the material, the photons interact with the molecules of the material, causing the molecules to vibrate, thereby generating sound waves or sound fields. The mechanism of generating sound waves or sound fields is that the laser energy is absorbed by the material and converted into heat energy, which causes the local temperature of the material to rise, resulting in thermoelastic expansion, and further generating sound waves or sound fields.

[0048] Compared with traditional underwater detection technology, laser acoustic technology has higher maneuverability and flexibility. It does not require complex sonar equipment. It only needs to project the laser beam onto the water surface, and through the reflection and refraction of the water surface, sound waves can be generated. This makes laser acoustic technology have greater advantages in underwater detection, especially in complex and changeable underwater environments. In addition, laser acoustic technology has high positioning accuracy. Since the propagation speed of sound waves in water is relatively fast and is less affected by the underwater environment, the sound waves generated by the laser can achieve accurate positioning of underwater objects. This feature gives laser acoustic technology unique advantages in the fields of seabed resource detection and underwater archaeology. For example, in the detection of seabed resources, laser acoustic technology can accurately locate mineral resources, biological resources, etc. on the seabed, providing strong support for the development and utilization of marine resources.

[0049] Laser-induced acoustic underwater detection technology also has the ability to detect across media. In traditional underwater detection technology, it is difficult to achieve comprehensive detection of the underwater environment because of the large restrictions on the propagation of signals such as sound waves and electromagnetic waves underwater. Laser-induced acoustic technology can achieve cross-media detection of the underwater environment through the interaction between sound waves and underwater objects. This feature makes laser-induced acoustic technology have a wide range of application prospects in marine scientific research. For example, in the study of marine ecosystems, laser-induced acoustic technology can achieve comprehensive detection of marine organisms, seabed topography, etc., and provide strong support for the protection and sustainable development of marine ecosystems. In practical applications, laser-induced acoustic underwater detection technology also needs to be combined with other marine detection technologies to form a comprehensive marine detection system. For example, it can be combined with satellite remote sensing, drone reconnaissance and other technologies to achieve all-round and multi-angle detection of the marine environment. This will further improve the efficiency and accuracy of marine detection and provide stronger support for marine scientific research and the development and utilization of marine resources.

[0050] In the second aspect, the embodiment of the present application provides an underwater detection device, the detection device includes the laser acoustic imaging mechanism in the above embodiment. By using the laser acoustic imaging mechanism in the above embodiment, the underwater detection device combines the characteristics of long-distance underwater transmission of sound waves on the basis of optical correlation imaging technology to form a laser acoustic imaging mechanism, which provides a reliable device for accurate detection for underwater long-distance imaging.

[0051] It should be understood that the utility model does not limit its application to the detailed structure and arrangement of the components proposed in the utility model. The utility model can have other embodiments and can be implemented and executed in a variety of ways. The aforementioned deformation forms and modified forms fall within the scope of the utility model. It should be understood that the utility model disclosed and defined in the utility model extends to all alternative combinations of two or more individual features mentioned or evident in the text and / or the drawings. All these different combinations constitute multiple alternative aspects of the utility model. The embodiments described in the utility model illustrate the best known methods for implementing the utility model and will enable those skilled in the art to utilize the utility model.

Claims

1. A laser acoustic imaging mechanism, characterized in that: include: A laser emitting assembly, comprising an emitting source, for emitting a laser beam; A focusing mirror array, comprising a plurality of focusing mirrors arranged in an array and facing the emission source, each of the focusing mirrors being provided with a switch structure, and the laser beam passing through the focusing mirror array to form an acoustic laser beam; A collection component, used for collecting the echo signal generated after the acoustic laser beam is emitted; A control component, the emission source, each of the switch structures and the collection component are all electrically connected to the control component.

2. The laser acoustic imaging mechanism according to claim 1, characterized in that: The distances between adjacent focusing mirrors are equal.

3. The laser acoustic imaging mechanism according to claim 2, characterized in that: A plurality of groups of different two-dimensional image information are preset in the control component to control the plurality of focusing mirrors to form a modulated light field with corresponding two-dimensional images.

4. The laser acoustic imaging mechanism according to any one of claims 1 to 3, characterized in that: The power density of the laser beam is greater than the light breakdown power density of the water body.

5. The laser acoustic imaging mechanism according to claim 4, characterized in that: The wavelength λ of the laser beam ranges from 266 nanometers to 10.8 micrometers.

6. The laser acoustic imaging mechanism according to claim 5, characterized in that: The pulse width of the laser beam is between 1 femtosecond and 1 millisecond.

7. The laser acoustic imaging mechanism according to any one of claims 1 to 3, characterized in that: The control component controls the switching structure to switch at a frequency that is a switching frequency, and the switching frequency is synchronized with the repetition frequency of the laser beam.

8. The laser acoustic imaging mechanism according to any one of claims 1 to 3, characterized in that: The laser acoustic imaging mechanism also includes a direction adjustment component, which includes a fixedly connected reflector and a movable seat, the movable seat is electrically connected to the control component, and the reflector is located in the light emitting direction of the focusing mirror array.

9. The laser acoustic imaging mechanism according to any one of claims 1 to 3, characterized in that: The collection component includes a collector and an acoustic sensor which are electrically connected, and the acoustic sensor is electrically connected to the control component.

10. An underwater detection device, characterized in that: The underwater detection equipment comprises the laser acoustic imaging mechanism as claimed in any one of claims 1 to 9.

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