CN210803959U - Device and system for realizing air imaging by utilizing photoacoustic effect - Google Patents
Device and system for realizing air imaging by utilizing photoacoustic effect Download PDFInfo
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Abstract
The utility model discloses a device for realizing air imaging by utilizing the photoacoustic effect, which comprises a first laser, a first deflection mirror and a first projector; the first laser and the first deflection mirror are positioned on the same straight line; the first deflection mirror is used for changing the transmission direction of light beams emitted by the first laser, the first deflection mirror deflects at a high speed to enable light to be transmitted to form a three-dimensional surface, an air screen is formed due to the photoacoustic effect of water vapor in the air, and the first projector projects light to the air screen to realize image display; a system for realizing air imaging by using a photoacoustic effect; the method avoids the complex and fussy steps of the traditional air imaging method, can realize high-resolution imaging, and can image in the air more quickly and simply.
Description
Technical Field
The utility model relates to a device and system for utilize light and sound effect to realize air imaging belongs to air imaging technical field.
Background
The photoacoustic effect is a phenomenon in which an acoustic signal is generated when a substance is irradiated with light whose intensity is periodically modulated. When a certain medium is irradiated by light, the temperature inside the medium is changed due to the absorption of the medium to the light, so that the structure and the volume of certain areas in the medium are changed; when a pulsed light source or a modulated light source is used, the temperature of the medium rises and falls to cause the volume of the medium to expand and contract, thereby radiating sound waves outward. This phenomenon is called photoacoustic effect (photoacoustic effect).
Air imaging is accomplished primarily through an air display screen. The air display screen mainly comprises two types: one with medium aerial imaging display screen and two without medium aerial imaging display screens.
The medium aerial imaging display screen is formed by hardware, and the medium aerial imaging display screen has two fatal defects and poor imaging quality; moisture in the mist is unpleasant;
the medium-free aerial imaging display screen mainly comprises two types: 1) AIR screens, the basic principle is to push a two-dimensional image into another three-dimensional space through a piece of glass with a negative refractive index; 2) magic Screen; one plane is transferred into another three-dimensional space.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome not enough among the prior art, provide a utilize the device and the system that the photoacoustic effect realized the air formation of image.
A device for realizing air imaging by utilizing a photoacoustic effect comprises a first laser, a first deflection mirror and a first projector; the first laser and the first deflection mirror are positioned on the same straight line;
the first deflection mirror is used for changing the transmission direction of light beams emitted by the first laser, the first deflection mirror deflects at a high speed to enable light to be transmitted to form a three-dimensional surface, an air screen is formed through a photoacoustic effect and water vapor in air, and the first projector projects light to the air screen to achieve image display.
Preferably, the laser further comprises at least one first wavefront modulator, the first wavefront modulator being arranged below the first laser, the first wavefront modulator being arranged to generate a first wavefront signal; the light beam emitted by the first laser is modulated.
Preferably, the optical fiber laser further comprises a first reflecting mirror, the first reflecting mirror is arranged at the opposite side of the first deflecting mirror, and the first reflecting mirror reflects the light rays reflected by the first deflecting mirror to generate a wider light beam range and light beam intensity.
Preferably, the first projector is a three-color laser, the three-color laser and the two wavefront modulators act together to realize spatial modulation in the three-dimensional z direction, that is, the first laser and the second laser are coupled to the same light path through the first wavefront modulator and the second wavefront modulator, respectively, and the three-color laser is coupled to the same light path through the first beam splitter and the second beam splitter, the first deflecting mirror realizes polarization of the coupled light path, the three-color laser loads video signals, and the video signals correspond to spatial scanning positions of the first deflecting mirror one to one.
Preferably, the laser wavelength of the first laser operates in the water vapour absorption band.
Preferably, the first deflection mirror is at least one of a current deflection mirror, a deflection mirror made by MEMS technology, or a high-speed optical deflector based on a super-surface structure, and the first deflection mirror realizes at least one-dimensional space high-speed deflection.
Preferably, an air humidifier is further included for providing air humidity to the device.
A system for imaging air using the photoacoustic effect, the system comprising the apparatus of any one of the preceding claims.
Preferably, the system comprises a plurality of sets, the plurality of sets being co-imaged.
Preferably, sets of ultrasound waves generated by the system are coherently superimposed in space.
Compared with the prior art, the utility model discloses the beneficial effect who reaches: the utility model provides a be applied to the air imaging field with the optoacoustic effect, can show arbitrary image in space optional position, both can be used for planar display, can use true three-dimensional display field again. Meanwhile, the device avoids complex and fussy steps of the traditional air imaging method, can realize high-resolution imaging, can image in the air more quickly and simply, and provides a new idea for the further development of true three-dimensional display in the future.
Drawings
Fig. 1 is a system light path diagram of embodiment 1 of the present invention;
fig. 2 is a system light path diagram of embodiment 2 of the present invention;
fig. 3 is a system light path diagram of embodiment 3 of the present invention;
fig. 4 is a system light path diagram of embodiment 4 of the present invention;
fig. 5 is a system light path diagram of embodiment 5 of the present invention;
fig. 6 is a system optical path diagram of embodiment 6 of the present invention;
fig. 7 is a system optical path diagram according to embodiment 7 of the present invention;
fig. 8 is a system optical path diagram of embodiment 8 of the present invention;
fig. 9 is a system optical path diagram according to embodiment 9 of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1:
as shown in fig. 1-9, an apparatus for realizing air imaging by using photoacoustic effect is disclosed, which comprises a first laser 1, a first deflection mirror 2, a first projector 3; the first laser 1 and the first deflection mirror 2 are positioned on the same straight line;
the first deflection mirror 2 is used for changing the propagation direction of light beams emitted by the first laser 1, the first deflection mirror 2 deflects at a high speed to enable the light beams to propagate to form a three-dimensional surface, an air screen is formed through a photoacoustic effect and water vapor in the air, and the first projector 3 projects the light beams to the air screen to realize image display.
The device further comprises at least one first wavefront modulator 4, the first wavefront modulator 4 being arranged below the first laser 1, the first wavefront modulator 4 modulating the light beam emitted by the first laser 1.
The device further comprises a first reflecting mirror 10, the first reflecting mirror 10 is arranged on the opposite side of the first deflection mirror 2, and the first reflecting mirror 10 reflects the light rays reflected by the first deflection mirror 2 to generate a wider light beam range and light beam intensity.
The laser wavelength of the first laser 1 operates in the water vapour absorption band.
The first deflection mirror 2 is at least one of a current deflection mirror, a deflection mirror made by MEMS technology, or a high-speed optical deflector based on a super surface structure, and the first deflection mirror 2 realizes at least one-dimensional space high-speed deflection.
The device also includes an air humidifier for providing air humidity to the device.
A system for imaging air using photoacoustic effects, the system comprising the apparatus of any of the preceding.
The system comprises a plurality of sets of systems which are used for imaging together, and the superposed space realizes space imaging with larger scale; ultrasonic waves generated by a plurality of sets of systems are coherently superposed in space, and the enhancement of the ultrasonic waves at fixed positions is realized.
Specifically, as shown in fig. 1, an apparatus for implementing air imaging by using photoacoustic effect disclosed in the embodiments of the present invention includes the following:
1, laying equipment: according to fig. 1, a first laser 1, a first deflection mirror 2 and a first projector 3 are sequentially arranged, so that the first laser 1 and the first deflection mirror 2 are on the same straight line; meanwhile, a first projector 3 is arranged on the other side of the space; the first deflection mirror 2 is a current deflection mirror, or a deflection mirror made by MEMS technology, or a high-speed optical deflector based on a super surface structure; the deflection mirror can deflect in one spatial dimension, namely, high-speed deflection in one dimension (x direction), and can also deflect in two or even more spatial dimensions, namely, high-speed deflection in two dimensions (x and y directions). Thereby causing air disturbance in a two-dimensional space or a three-dimensional space, and enhancing the display effect of the air screen.
2, a light beam emitted by the first laser 1 passes through the first deflection mirror 2 and is reflected by the first deflection mirror 2 to change the propagation direction, meanwhile, the first deflection mirror 2 deflects the light beam in the horizontal direction and also deflects the light beam in the vertical direction, and the light beam is reflected to a three-dimensional space area with a side less than 360 degrees by the rapidly deflected first deflection mirror 2, so that the three-dimensional space area is filled with the laser beam; the laser wavelength of the first laser 1 is operated in the water vapor absorption band, for example, around 1300nm to 2000nm, and the operation mode may be continuous wave or pulse wave.
3, in the three-dimensional space region, the water vapor in the air has high absorptivity for the laser light with a specific wavelength due to the acousto-optic effect, so that air disturbance can be caused, the diffuse reflection of the air in the region can be enhanced, and when a projector is used for projecting the laser light into the region, the region can be used as an air screen, namely, the region can be used for displaying images.
Example 2:
as shown in fig. 2, an apparatus for implementing air imaging by using photoacoustic effect disclosed in the embodiment of the present invention includes the following components:
1, laying equipment: according to fig. 2, a first laser 1, a first acousto-optic modulator 4, a first deflecting mirror 2, a first reflecting mirror 10 and a first projector 3 are sequentially arranged, so that the first laser 1, the first acousto-optic modulator 4 and the first deflecting mirror 2 are on the same straight line; while the first mirror 10 is arranged on one side of the first deflection mirror and the first projector 3 is arranged on the other side of the space.
2, the light beam emitted by the first laser 1 is modulated by the first acousto-optic modulator 4, the modulated light passes through the first deflection mirror 2 and is reflected by the first deflection mirror 2, the propagation direction is changed, the first deflection mirror 2 deflects the light in the horizontal direction and deflects the light in the vertical direction, so that the light is reflected into a three-dimensional space on one side of the first deflection mirror, then the light is incident on the first reflection mirror 10, and the light is reflected by the first reflection mirror 10 to generate a larger range of the light beam range and the light beam intensity in the three-dimensional space opposite to the previous direction.
3, in the three-dimensional space region between the quick deflection mirror and the reflecting mirror, water vapor in the air has higher absorptivity for laser with a specific wavelength, and because the light beam is modulated, ultrasonic waves can be generated in the region due to the photoacoustic effect, so that air disturbance can be caused, the diffuse reflection of the air in the region can be enhanced, and when a projector is used for projecting to the region, the region can be used as an air screen, namely, the region can be used for displaying images.
Example 3:
as shown in fig. 3, an apparatus for implementing air imaging by using photoacoustic effect disclosed in the embodiment of the present invention includes the following components:
1, laying equipment: according to fig. 3, a first laser 1, a second laser 6, a first acousto-optic modulator 4, a second acousto-optic modulator 7, a first laser 5, a first beam splitter 8, a second beam splitter 9, and a first deflection mirror 2 are arranged in sequence. Wherein the first laser 1, the first acousto-optic modulator 4 and the first beam splitter 8 are on the same straight line, the second laser 6, the second acousto-optic modulator 7 and the second beam splitter 9 are on the same straight line, and the first RGB laser 5, the first beam splitter 8, the second beam splitter 9 and the first deflection mirror 2 are on the same straight line;
2, the light beam emitted from the first laser 1 reaches the first beam splitter 8 through the first acousto-optic modulator 4 and is reflected onto the second beam splitter 9, then reaches the first deflecting mirror 2 through the second beam splitter 9 and is reflected by the first deflecting mirror 2, the propagation direction is changed, the light beam emitted from the second laser 6 reaches the second beam splitter 9 through the second acousto-optic modulator 7 and is reflected onto the first deflecting mirror 2 and is reflected by the first deflecting mirror 2, the propagation direction is changed, the light beam emitted from the first RGB laser 5 reaches the first beam splitter 8 and is transmitted onto the second beam splitter 9, then reaches the first deflecting mirror 2 through the second beam splitter 9 and is reflected by the first deflecting mirror 2, the first deflecting mirror 2 deflects the light beam in both the horizontal direction and the vertical direction, the light beam is reflected into the three-dimensional space on one side thereof, and causes air disturbance due to the photoacoustic effect, forming an air screen.
3, in the area between the fast deflecting mirror and the reflecting mirror, the water vapor in the air has high absorptivity for the laser with a specific wavelength, and since the light beam is modulated, ultrasonic waves are generated in the area due to the photoacoustic effect, and the frequencies of the ultrasonic waves generated by the two light beams emitted from different acousto-optic modulators are different due to different modulation frequencies, so that a point with a maximum value generated due to different frequencies appears at a certain point in a certain direction in the area, the air disturbance of the point is strongest in the direction, the air diffuse reflection effect of the point can be considered as the strongest point in the direction, and the position where the point appears is controlled by an algorithm, so that the clearest image which is required to be displayed in the area of the air screen formed by the disturbance of the ultrasonic waves is displayed in the direction. And controlling the first RGB laser 5 which can be controlled by programming according to the above, so that when the first RGB laser 5 is used for projecting to the region, each maximum point in each direction in the space is exactly the point where the pixel point which is wanted to project, the color display of any position in the three-dimensional space can be realized by synchronizing the image signal loaded by the first RGB laser 5 and the strongest air disturbance position in the three-dimensional space, and when the color display of the pixel points at all the positions in the three-dimensional space is finished, the three-dimensional display of the three-dimensional space can be realized.
Example 4:
as shown in fig. 4, an apparatus for implementing air imaging by using photoacoustic effect disclosed in the embodiments of the present invention includes the following:
1, laying equipment: according to fig. 4, a first laser 1, a second laser 6, a first acousto-optic modulator 4, a second acousto-optic modulator 7, a first projector 3, a first deflecting mirror 2, and a second deflecting mirror 11 are arranged in this order. The first laser 1, the first acousto-optic modulator 4 and the first deflection mirror 2 are on a straight line, the second laser 6, the second acousto-optic modulator 7 and the second deflection mirror 11 are on a straight line, a system 1 formed by the first laser 1, the first acousto-optic modulator 4 and the first deflection mirror 2 and a system 2 formed by the second laser 6, the second acousto-optic modulator 7 and the second deflection mirror 11 are on the same horizontal plane in space, and the first projector 3 is arranged at any position on the horizontal plane.
2, a light beam emitted by the first laser 1 reaches the first deflection mirror 2 through the first acousto-optic modulator 4 and is reflected by the first deflection mirror 2, and the first deflection mirror 2 deflects the light beam in the horizontal direction and also deflects the light beam in the vertical direction; the light beam emitted by the second laser 6 reaches the second deflection mirror 11 through the second acousto-optic modulator 7 and is reflected by the second deflection mirror 11, and the second deflection mirror 11 deflects the light beam in the horizontal direction and deflects the light beam in the vertical direction; the first deflection mirror 2 and the second deflection mirror 11 deflect at high speed simultaneously, and air disturbance is caused in the area between the two deflection mirrors due to the photoacoustic effect, so that a three-dimensional air screen is formed.
3, in the areas of the first fast deflecting mirror 2 and the second deflecting mirror 11, the water vapor in the air has high absorptivity for the laser with a specific wavelength, and because the light beam is modulated, ultrasonic waves are generated in the area due to the photoacoustic effect, and because the modulation frequencies of the two light beams emitted from different acousto-optic modulators are different, the frequencies of the ultrasonic waves generated by the two light beams are also different, so that a maximum point generated due to different frequencies appears at a certain point in a certain direction in the area, the air disturbance of the point is strongest in the direction, the air diffuse reflection effect of the point can be considered as the strongest point in the direction, the position where the point appears is controlled by an algorithm, and the first projector 3 which can be controlled by programming is controlled according to the point, so that when the first projector 3 is used for projecting into the area, each maximum point in each direction in space is exactly the point where the pixel point which we want to project is projected, so that the sharpest image which we want to display is displayed at the area where the sheet forms an air screen due to the disturbance of ultrasonic waves.
Example 5:
as shown in fig. 5, an apparatus for implementing air imaging by using photoacoustic effect disclosed in the embodiments of the present invention includes the following:
1, laying equipment: according to fig. 5, a first laser 1, a second laser 6, a first acousto-optic modulator 4, a second acousto-optic modulator 7, a first projector 3, a first deflecting mirror 2, and a second deflecting mirror 11 are arranged in this order. The first laser 1, the first acousto-optic modulator 4 and the first deflection mirror 2 are on a straight line, the second laser 6, the second acousto-optic modulator 7 and the second deflection mirror 11 are on a straight line, a system 1 formed by the first laser 1, the first acousto-optic modulator 4 and the first deflection mirror 2 and a system 2 formed by the second laser 6, the second acousto-optic modulator 7 and the second deflection mirror 11 are in a vertical relation in space, and the first projector 3 is arranged at any position on the vertical plane.
2, a light beam emitted by the first laser 1 reaches the first deflection mirror 2 through the first acousto-optic modulator 4 and is reflected by the first deflection mirror 2, and the first deflection mirror 2 deflects the light beam in the horizontal direction and also deflects the light beam in the vertical direction; the light beam emitted by the second laser 6 reaches the second deflection mirror 11 through the second acousto-optic modulator 7 and is reflected by the second deflection mirror 11, and the second deflection mirror 11 deflects the light beam in the horizontal direction and deflects the light beam in the vertical direction; the first deflection mirror 2 and the second deflection mirror 11 deflect at high speed simultaneously, and air disturbance is caused in the area between the two deflection mirrors due to the photoacoustic effect, so that a three-dimensional air screen is formed.
3, in the areas of the first fast deflecting mirror 2 and the second deflecting mirror 11, the water vapor in the air has high absorptivity for the laser with a specific wavelength, and because the light beam is modulated, ultrasonic waves are generated in the area due to the photoacoustic effect, and because the modulation frequencies of the two light beams emitted from different acousto-optic modulators are different, the frequencies of the ultrasonic waves generated by the two light beams are also different, so that a maximum point generated due to different frequencies appears at a certain point in a certain direction in the area, the air disturbance of the point is strongest in the direction, the air diffuse reflection effect of the point can be considered as the strongest point in the direction, the position where the point appears is controlled by an algorithm, and the first projector 3 which can be controlled by programming is controlled according to the point, so that when the first projector 3 is used for projecting into the area, each maximum point in each direction in space is exactly the point where the pixel point which we want to project is projected, so that the sharpest image which we want to display is displayed at the area where the sheet forms an air screen due to the disturbance of ultrasonic waves.
Example 6:
as shown in fig. 6, an apparatus for implementing air imaging by using photoacoustic effect disclosed in the embodiments of the present invention includes the following:
1, laying equipment: the systems 1, 2, 3 and 4 are sequentially arranged according to fig. 6, wherein the system 1 is composed of a first laser 1, a first acousto-optic modulator 4 and a first deflection mirror 2, the system 2 is composed of a second laser 6, a second acousto-optic modulator 7 and a second deflection mirror 11, the system 3 is composed of a third laser 12, a third acousto-optic modulator 13 and a third deflection mirror 14, and the system 4 is composed of a fourth laser 15, a fourth acousto-optic modulator 16 and a fourth deflection mirror 17, and the systems 1, 2, 3 and 4 are in a three-dimensional relationship in space, but it is required to ensure that light beams emitted by each system can appear in the same region in space. The first projector 3 is arranged at any place in space.
2, the light beam emitted by each system is modulated by the acousto-optic modulator in the system.
3, in the area where the light beams emitted by the systems 1, 2, 3 and 4 meet, the water vapor in the air has high absorptivity to the laser light with a specific wavelength, and because the light beams are modulated, ultrasonic waves are generated in the area due to the photoacoustic effect, and the frequencies of the ultrasonic waves generated by two light beams emitted from different acousto-optic modulators are different due to different modulation frequencies, so that a maximum point generated due to different frequencies appears at a certain point in a certain direction in the area, the air disturbance of the point is strongest in the direction, the air diffuse reflection effect of the point can be considered as the strongest point in the direction, the position where the point appears is controlled by an algorithm, and the first projector 3 which can be controlled by the programming is controlled according to the point, so that when the first projector 3 is used for projecting to the area, each maximum point in each direction in space is exactly the point where the pixel point which we want to project is projected, so that the sharpest image which we want to display is displayed at the area where the sheet forms an air screen due to the disturbance of ultrasonic waves.
Example 7:
as shown in fig. 7, an apparatus for implementing air imaging by using photoacoustic effect disclosed in the embodiments of the present invention includes the following:
1, laying equipment: according to fig. 7, a first laser 1, a first acousto-optic modulator 4, a first deflection mirror 2, a first RGB laser 5, a first beam splitter 8 and a humidifier 18 are sequentially arranged, so that the first laser 1, the first acousto-optic modulator 4 and the first beam splitter 8 are on the same straight line; the first RGB laser 5, the first beam splitter 8, the first deflection mirror 2 is in the collinear; the humidifier 18 is arranged on the first deflector 2 side.
2, light beams emitted by the first laser 1 are modulated by the first acousto-optic modulator 4, the modulated light passes through the first optical splitter 8 and is reflected by the first optical splitter 8, the propagation direction is changed, the modulated light is reflected to the first deflection mirror 2, meanwhile, the light beams emitted by the RGB laser pass through the first optical splitter 8 and are transmitted to the first deflection mirror 2, and the first deflection mirror 2 deflects the light in the horizontal direction and deflects the light in the vertical direction; the three-dimensional space region on one side of the light guide plate is filled with light. While the humidifier is used to perform a humidifying operation on the area.
3, in the area, the humidification of the area by the humidifier leads to the humidity increase of the area, the water vapor in the air has higher absorptivity for laser with a specific wavelength, and because the light beam is modulated, ultrasonic waves can be generated in the area due to the photoacoustic effect, so that air disturbance can be caused, the diffuse reflection of the air in the area can be enhanced, and when a projector is used for projecting to the area, the area can be used as an air screen, namely, the area can be used for displaying images.
Example 8:
as shown in fig. 8, an apparatus for implementing air imaging by using photoacoustic effect disclosed in the embodiments of the present invention includes the following:
1, laying equipment: according to FIG. 8, system 1, system 2. system n are arranged, and each system 1, system 2. system n is composed of a laser, an acousto-optic modulator and a deflection mirror in the horizontal space;
2, in the system 1, the light beam emitted by the first laser 1 passes through the first acousto-optic modulator 4 and the first deflection mirror 2 and is reflected by the first deflection mirror 2, and at this time, the first deflection mirror 2 deflects in only one direction, so that the light emitted by the system 1 only exists on one plane, and the light beams emitted by the system 2 and the system n only exist on one plane.
3, in this area, the water vapor in the air has high absorptivity for the laser light with a specific wavelength, and since the light beam is modulated, ultrasonic waves are generated in this area due to the photoacoustic effect, so that air disturbance is generated, and the first RGB laser 5 which can be controlled by programming is controlled based on this, so that when we project into this area by using the first RGB laser 5, the sharpest image which we want to display is displayed at the area where the air screen is formed due to the disturbance of the ultrasonic waves.
Example 9:
as shown in fig. 9, an apparatus for implementing air imaging by using photoacoustic effect disclosed in the embodiments of the present invention includes the following:
1, laying equipment: according to fig. 9, a first laser 1, a second laser 6, a first acousto-optic modulator 4, a second acousto-optic modulator 7, a first RGB laser 5, a first beam splitter 8, a second beam splitter 9, and a first deflection mirror 2 are arranged in sequence. The first laser 1, the first acousto-optic modulator 4 and the first beam splitter 8 are on the same straight line, the second laser 6, the second acousto-optic modulator 7 and the second beam splitter 9 are on the same straight line, and the first RGB laser 5, the first beam splitter 8, the second beam splitter 9 and the first deflection mirror 2 are on the same straight line.
2, the light beam emitted from the first laser 1 reaches the first beam splitter 8 through the first acousto-optic modulator 4 and is reflected onto the second beam splitter 9, then reaches the first deflecting mirror 2 through the second beam splitter 9 and is reflected by the first deflecting mirror 2, the propagation direction is changed, the light beam emitted from the second laser 6 reaches the second beam splitter 9 through the second acousto-optic modulator 7 and is reflected onto the first deflecting mirror 2 and is reflected by the first deflecting mirror 2, the propagation direction is changed, the light beam emitted from the first RGB laser 5 reaches the first beam splitter 8 and is transmitted onto the second beam splitter 9, then reaches the first deflecting mirror 2 through the second beam splitter 9 and is reflected by the first deflecting mirror 2, the first deflecting mirror 2 deflects the light beam in both the horizontal direction and the vertical direction, the light beam is reflected into the three-dimensional space on one side thereof, and causes air disturbance due to the photoacoustic effect, forming an air screen.
3, in the area between the fast deflecting mirror and the reflecting mirror, the water vapor in the air has higher absorptivity for the laser with a specific wavelength, and because the light beam is modulated, ultrasonic waves are generated in the area due to the photoacoustic effect, two light beams emitted from different acousto-optic modulators have the same modulation frequency, and the frequencies of the generated ultrasonic waves are also the same, so that coherent addition is generated in the area, the air disturbance of certain points is strongest in the direction, the air diffuse reflection effect of the points can be considered as the strongest point in the direction, the position where the point appears is controlled by an algorithm, and the first RGB laser 5 which can be controlled by programming is used as a basis to control, when the first RGB laser 5 is used for projecting to the area, each maximum point in each direction in the space is exactly where a pixel point which we want to project, this will show the sharpest image we want to show at the area of the sheet where the air screen is formed due to the disturbance of the ultrasound. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.
Claims (10)
1. A device for realizing air imaging by utilizing a photoacoustic effect is characterized by comprising a first laser (1), a first deflection mirror (2) and a first projector (3); the first laser (1) and the first deflection mirror (2) are positioned on the same straight line;
the first deflection mirror (2) is used for changing the transmission direction of light beams emitted by the first laser (1), the first deflection mirror (2) deflects at a high speed to enable the light beams to be transmitted to form a three-dimensional surface, an air screen is formed through a photoacoustic effect and water vapor in the air, and the first projector (3) projects the light beams to the air screen to realize image display.
2. The device for realizing air imaging by using photoacoustic effect according to claim 1, characterized by further comprising at least one first wavefront modulator (4), wherein the first wavefront modulator (4) is disposed below the first laser (1), and the first wavefront modulator (4) modulates the light beam emitted from the first laser (1).
3. The device for realizing air imaging by utilizing the photoacoustic effect of claim 1, further comprising a first reflector (10), wherein the first reflector (10) is arranged at the opposite side of the first deflection mirror (2), and the first reflector (10) reflects the light reflected by the first deflection mirror (2) to generate a wider range of light beams and light beam intensities.
4. The device for realizing air imaging by utilizing the photoacoustic effect according to claim 1, wherein the first projector (3) is a three-color laser (5), the three-color laser (5) and two wavefront modulators act together to realize spatial modulation in the three-dimensional z direction, that is, the first laser (1) and the second laser (6) are coupled to the same optical path through the first wavefront modulator (4) and the second wavefront modulator (7) respectively, and the three-color laser (5) is coupled to the same optical path through the first beam splitter (8) and the second beam splitter (9), the first deflecting mirror (2) realizes polarization of the coupled optical path, the three-color laser (5) loads video signals, and the video signals correspond to the spatial scanning positions of the first deflecting mirror (2) one by one.
5. The device for imaging air by photoacoustic effect of claim 1, wherein the laser wavelength of the first laser (1) is operated in the water vapor absorption band.
6. The device for realizing air imaging by using photoacoustic effect according to claim 1, wherein the first deflection mirror (2) is at least one of a galvanic deflection mirror, a deflection mirror made by MEMS technology, or a high-speed optical deflector based on super surface structure, and the first deflection mirror (2) realizes at least one-dimensional space high-speed deflection.
7. The device for imaging air using photoacoustic effect of claim 1 further comprising an air humidifier for providing air humidity to the device.
8. A system for airborne imaging using the photoacoustic effect, the system comprising the apparatus of any one of claims 1 to 7.
9. The system for airborne imaging using photoacoustic effects of claim 8 wherein said system comprises multiple sets of said system for co-imaging.
10. The system for realizing air imaging by utilizing photoacoustic effect of claim 9, wherein the ultrasonic waves generated by a plurality of sets of said system are added in a coherent manner in space.
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| CN110488565A (en) * | 2019-08-26 | 2019-11-22 | 句容福芯电子有限公司 | A kind of apparatus and system for realizing air imaging using optoacoustic effect |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110488565A (en) * | 2019-08-26 | 2019-11-22 | 句容福芯电子有限公司 | A kind of apparatus and system for realizing air imaging using optoacoustic effect |
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