A three-dimensional aerial imaging device based on light beam intersection ionization of air

Abstract

The present invention discloses a three-dimensional aerial imaging device based on light beam intersection ionization of air, comprising: a pulse seed source, a spectroscopic coupler, a plurality of galvanometer components, a plurality of pulse amplification modules and a plurality of time delay lines, wherein the spectroscopic coupler is arranged on the line of the pulse light beam for dividing the pulse light beam into a plurality of sub-beams, and the plurality of pulse amplification modules, the plurality of time delay lines and the plurality of galvanometer components are arranged on the line of the plurality of sub-beams in a one-to-one correspondence. The pulse light beam is divided into a plurality of sub-beams by a spectroscopic coupler, and the plurality of sub-beams are intersected after amplification processing, time delay processing and steering processing. Since the plurality of sub-beams are divided from the same pulse light beam, the problem of pulse time synchronization between the sub-beams can be solved, and the plurality of galvanometer components are used to control the plurality of sub-beams to perform intersection ionization, thereby increasing the area range of the intersection point of the sub-beams, and further expanding the imaging range of the three-dimensional aerial imaging device.

Description

Technical Field

[0001] The invention relates to the field of air display, in particular to a three-dimensional air imaging device based on light beam intersection and ionized air. Background Art

[0002] The existing air ionization system is divided into a flat display air ionization system and a stereo display air ionization system. The flat display air ionization system includes three modules: a high-power pulse light source, a beam control, and an air ionization. The beam control module consists of a two-dimensional high-speed scanning galvanometer and a flat field focusing lens. The galvanometer system is composed of a combination of galvanometers in the x-direction and y-direction, which can make the reflected light beam scan in a plane; the flat field focusing lens forms a uniformly sized focused light spot on the entire plane. For the stereo display air ionization system, a zoom lens is added on the basis of the flat display system. The zoom lens changes the position of the focal point of the ionization area in the z direction by changing the focal length of the lens. Combined with the x-direction and y-direction galvanometers, the ionization point can be controlled to change in the three-dimensional space, thereby forming a three-dimensional picture. In order to increase the pixels of the display picture, a spatial light modulator (SLM) is added to the beam control system to achieve the purpose of light wave modulation by modulating the amplitude, phase, polarization state and other parameters of the light field. The output beam of the pulse light source is modulated by the SLM light field, and multiple focal points are formed after passing through the zoom system, thereby increasing the pixels of the display picture.

[0003] In the existing stereoscopic display air ionization system, the high-power pulse light source outputs laser pulses, which are modulated by the SLM and then reflected to the galvanometer system to adjust its emission direction. The light beam passes through the zoom lens and the flat-field focusing lens and is focused to a specified point in the air ionization area. Finally, the high-power laser ionizes the air molecules to form a bright spot. The computer actively controls the SLM, the galvanometer system, and the zoom lens to adjust the position of the laser ionization point and the pixels of the display according to the required display image.

[0004] Due to the limitation of the galvanometer deflection angle in the galvanometer system and the size limitation of the zoom lens, the display range of the air ionization system is small and cannot meet the demand for larger aerial display. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a three-dimensional aerial imaging device based on light beam intersection ionization of air, which divides a pulse light source into multiple sub-beams and intersects them in the air, solves the synchronization problem between pulses at the intersection point, and generates air ionization at the intersection point of the light beams, solves the technical problem that the air ionization system has a small display screen range due to various factors in the display system, and significantly increases the range of the air ionization display area.

[0006] According to an embodiment of the present invention, a three-dimensional aerial imaging device based on light beam intersection ionization of air comprises: a pulse seed source, a spectroscopic coupler, a plurality of galvanometer components, a plurality of pulse amplification modules and a plurality of time delay lines, wherein the pulse seed source generates a pulse light beam, the spectroscopic coupler is arranged on the line of the pulse light beam for dividing the pulse light beam into a plurality of sub-beams, a plurality of the galvanometer components are arranged one-to-one on the lines of the plurality of sub-beams for changing the irradiation direction of the sub-beams in the horizontal or vertical direction so as to make the plurality of sub-beams intersect at an intersection point and ionize the air to form a holographic real image, a plurality of the pulse amplification modules are arranged one-to-one on the lines of the plurality of sub-beams for amplifying the pulses of the sub-beams, and the pulse amplification modules are located between the galvanometer components and the spectroscopic coupler, a plurality of the time delay lines are arranged one-to-one on the lines of the plurality of sub-beams, and the time delay lines are located between the pulse amplification modules and the galvanometer components, and the time delay lines are used to adjust the pulse time positions of the sub-beams so that the plurality of pulse times coincide when the sub-beams intersect at the intersection point.

[0007] According to the three-dimensional aerial imaging device based on beam intersection ionization of air in the embodiment of the present invention, a splitter coupler is used to divide a pulse beam into multiple sub-beams, and the multiple sub-beams are intersected after amplification, time delay and steering. Since the multiple sub-beams are divided from the same pulse beam, the problem of pulse time synchronization between the sub-beams can be solved. In addition, multiple galvanometer components are used to control multiple sub-beams for intersection ionization, thereby increasing the area range of the intersection point of the sub-beams, thereby expanding the imaging range of the three-dimensional aerial imaging device.

[0008] According to one embodiment of the present invention, the three-dimensional aerial imaging device also includes: a plurality of pulse compression devices, wherein the plurality of pulse compression devices are arranged one by one on the lines of the plurality of sub-beams, and the pulse compression devices are located between the pulse amplification module and the time delay line, and the pulse compression devices are used to compress the pulse width of the sub-beams to increase the peak power of the pulse light of the sub-beams.

[0009] According to one embodiment of the present invention, the three-dimensional aerial imaging device also includes: a plurality of beam collimation devices, wherein the plurality of pulse beam collimation devices are arranged one by one on the lines of the plurality of sub-beams, and the beam collimation devices are located between the pulse compression device and the time delay line, and the beam collimation devices are used to adjust the sub-beams into collimated beams that meet the ionization threshold.

[0010] According to one embodiment of the present invention, the three-dimensional aerial imaging device also includes: a water-cooled radiator, which is connected to the pulse seed source, the spectroscopic coupler, the pulse amplification module, the pulse compression device and the beam collimation device to dissipate heat for the pulse seed source, the spectroscopic coupler, the pulse amplification module, the pulse compression device and the beam collimation device.

[0011] According to one embodiment of the present invention, the three-dimensional aerial imaging device also includes: a pulse light source housing, a temperature sensor and a controller, the pulse seed source, the spectroscopic coupler, the pulse amplification module, the pulse compression device and the beam collimation device are all arranged in the pulse light source housing, a plurality of light exit ports for the sub-beams to pass through are formed on the pulse light source housing, the temperature sensor is arranged in the pulse light source housing for detecting the temperature inside the pulse light source housing, and the controller signal connects the temperature sensor and the water-cooled radiator for controlling the temperature inside the pulse light source housing.

[0012] According to one embodiment of the present invention, the controller signal connects the pulse seed source, the beam splitter coupler, the pulse amplification module, the pulse compression device and the beam collimation device to control the output parameters of the sub-beam.

[0013] According to an embodiment of the present invention, the pulse amplification module includes: a pre-amplification module and a main amplification module, and the pre-amplification module is located between the main amplification module and the optical splitter coupler.

[0014] According to one embodiment of the present invention, the pulse width of the plurality of sub-beams is 10 fs-100 ns, the pulse energy is 10 μJ-100 mJ, and the pulse repetition frequency is 50 Hz-10 MHz. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 A schematic structural diagram of a three-dimensional aerial imaging device based on light beam intersection ionization of air according to an embodiment of the present invention.

[0018] Reference numerals:

[0019] 1-1: pulse seed source; 1-2: spectroscopic coupler; 1-3: first pulse amplification module; 1-4: second pulse amplification module; 1-5: first pulse compression device; 1-6: second pulse compression device; 1-7; first beam collimation device; 1-8: second beam collimation device; 2: time delay line; 2-1: first time delay line; 2-2: second time delay line; 3: galvanometer assembly; 3-1: first galvanometer assembly; 3-2: second galvanometer assembly; 4: holographic real image; 5: controller; 6: water-cooled radiator; 7: calculator. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0021] Reference below Figure 1 A three-dimensional aerial imaging device based on light beam intersection ionization of air according to an embodiment of the present invention is described.

[0022] like Figure 1 As shown, a three-dimensional aerial imaging device based on light beam intersection ionization of air according to an embodiment of the present invention includes: a pulse seed source 1-1, a spectroscopic coupler 1-2, a plurality of galvanometer assemblies 3, a plurality of pulse amplification modules and a plurality of time delay lines 2.

[0023] Specifically, the pulse seed source 1-1 can generate a pulse light beam, and the spectroscopic coupler 1-2 is arranged on the line of the pulse light beam and adjacent to the pulse seed source 1-1, and is used to split the pulse light beam into multiple sub-beams. The pulse light beam is irradiated on the spectroscopic coupler 1-2 and split into multiple sub-beams, wherein the energy of the multiple sub-beams can be evenly distributed. Generally, the pulse light beam can be split into two sub-beams.

[0024] Among them, multiple galvanometer assemblies 3 are arranged one by one on the lines of multiple sub-beams, and are used to change the irradiation direction of the sub-beams in the horizontal or vertical direction so as to make the multiple sub-beams converge at the intersection and ionize the air to form a holographic real image 4. Multiple pulse amplification modules are arranged one by one on the lines of multiple sub-beams for amplifying the pulses of the sub-beams, and the pulse amplification modules are located between the galvanometer assemblies 3 and the spectroscopic couplers 1-2. Multiple time delay lines 2 are arranged one by one on the lines of multiple sub-beams, and the time delay lines 2 are located between the pulse amplification modules and the galvanometer assemblies 3. The time delay lines 2 are used to adjust the pulse time positions of the sub-beams so that multiple pulse times coincide when the sub-beams converge at the intersection.

[0025] like Figure 1 As shown, taking two sub-beams as an example, the three-dimensional aerial imaging device includes: a pulse seed source 1-1, a spectroscopic coupler 1-2, two galvanometer assemblies 3, two pulse amplification modules and two time delay lines 2, the two galvanometer assemblies 3 are respectively a first galvanometer assembly 3-1 and a second galvanometer assembly 3-2, the two pulse amplification modules are respectively a first pulse amplification module 1-3 and a second pulse amplification module 1-4, and the two time delay lines 2 are respectively a first time delay line 2-1 and a second time delay line 2-2.

[0026] The pulse light beam generated by the pulse seed source 1-1 passes through the spectroscopic coupler 1-2 to form two sub-beams, namely the first sub-beam and the second sub-beam. The first galvanometer assembly 3-1, the first pulse amplification module 1-3 and the first time delay line 2-1 are arranged on the first sub-beam, and the second galvanometer assembly 3-2, the second pulse amplification module 1-4 and the second time delay line 2-2 are arranged on the second sub-beam.

[0027] That is to say, in the forward direction of each sub-beam, a pulse amplification module, a time delay line 2 and a galvanometer assembly 3 are arranged in sequence. The energy of the sub-beam separated by the spectroscopic coupler 1-2 is relatively low. After passing through the pulse amplification module, the energy of the sub-beam increases, and then passes through the time delay line 2 to ensure that the multiple pulses in the multiple sub-beams are synchronized in time. After the sub-beam enters the galvanometer assembly 3 to change the irradiation direction, the multiple sub-beams intersect in the air. After the intersection, the energy of the sub-beams converges to reach the threshold of air ionization, and the multiple sub-beams ionize the air at the intersection point to form a holographic real image 4.

[0028] According to the three-dimensional aerial imaging device based on beam intersection ionization of air in the embodiment of the present invention, a splitter coupler 1-2 is used to divide a pulse beam into multiple sub-beams, and the multiple sub-beams are intersected after amplification, time delay and steering. Since the multiple sub-beams are divided from the same pulse beam, the time synchronization problem between multiple pulses in the sub-beams can be solved. In addition, multiple galvanometer components 3 are used to control multiple sub-beams for intersection ionization, thereby increasing the area range of the sub-beam intersection point, thereby expanding the imaging range of the three-dimensional aerial imaging device.

[0029] like Figure 1As shown, in some specific embodiments, the three-dimensional aerial imaging device also includes a plurality of pulse compression devices, and the plurality of pulse compression devices are arranged one by one on the lines of the plurality of sub-beams, and the pulse compression devices are located between the pulse amplification module and the time delay line 2. That is to say, a pulse compression device is provided on each sub-beam, and in the forward direction of the sub-beam, the pulse compression device is arranged between the pulse amplification module and the time delay line 2, and the pulse compression device is used to compress the pulse width of the sub-beam to increase the peak power of the pulse light of the sub-beam.

[0030] like Figure 1 As shown, there are two pulse compression devices, namely, a first pulse compression device 1-5 and a second pulse compression device 1-6. The first pulse compression device 1-5 is arranged on the first sub-beam, and the second pulse compression device 1-6 is arranged on the second sub-beam. By arranging the pulse compression device on the sub-beam, the peak power of the pulse light of the sub-beam can be increased, and then the laser power density at the intersection of the sub-beams can be increased, which is beneficial to reduce the ionization threshold and improve the imaging effect.

[0031] like Figure 1 As shown, in some specific embodiments, the three-dimensional aerial imaging device also includes a plurality of beam collimation devices, and the plurality of pulse beam collimation devices are arranged one by one on the lines of the plurality of sub-beams, and the beam collimation devices are located between the pulse compression device and the time delay line 2. That is to say, a beam collimation device is provided on each sub-beam, and in the direction of the sub-beam's advancement, the beam collimation device is located between the pulse compression device and the time delay line 2 on the sub-beam, and the beam collimation device can adjust the sub-beam into a collimated beam that meets the ionization threshold.

[0032] There are two beam collimation devices, namely, a first beam collimation device 1-7 and a second beam collimation device 1-8. The first beam collimation device 1-7 is arranged on the first sub-beam, and the second beam collimation device 1-8 is arranged on the second sub-beam. By arranging the beam collimation device on the sub-beam, the beam parameters of the sub-beam can be adjusted by the beam collimation device to ensure that the sub-beam meets the requirements of the ionization threshold, thereby improving the effect of ionization imaging.

[0033] According to one embodiment of the present invention, the three-dimensional aerial imaging device also includes a water-cooled radiator 6, which is connected to the pulse seed source 1-1, the spectroscopic coupler 1-2, the pulse amplification module, the pulse compression device and the beam collimation device to dissipate heat for the pulse seed source 1-1, the spectroscopic coupler 1-2, the pulse amplification module, the pulse compression device and the beam collimation device.

[0034] Since the pulse seed source 1-1 generates a high-energy pulse light source, and the light beam passes through the spectroscopic coupler 1-2, the pulse amplification module, the pulse compression device and the beam collimation device in sequence, the pulse seed source 1-1, the spectroscopic coupler 1-2, the pulse amplification module, the pulse compression device and the beam collimation device will generate a large amount of heat during operation. By setting up a water-cooled radiator 6, the pulse seed source 1-1, the spectroscopic coupler 1-2, the pulse amplification module, the pulse compression device and the beam collimation device can be cooled to prevent the heat on the pulse seed source 1-1, the spectroscopic coupler 1-2, the pulse amplification module, the pulse compression device and the beam collimation device from being too concentrated to cause damage to the equipment. In addition, the water-cooled radiator 6 can adjust the heat dissipation area by adjusting the flow direction of the water channel, has strong controllability, can dissipate heat for multiple devices at the same time, and has low cost and good effect for water cooling, which can meet the heat dissipation requirements of three-dimensional aerial imaging devices.

[0035] According to one embodiment of the present invention, the three-dimensional aerial imaging device further includes: a pulse light source housing, a temperature sensor and a controller 5 .

[0036] The pulse seed source 1-1, the spectroscopic coupler 1-2, the pulse amplifying module, the pulse compression device and the beam collimating device are all arranged in the pulse light source housing, and a plurality of light outlets for the sub-beams to pass through are formed on the pulse light source housing, that is, the pulse seed source 1-1, the spectroscopic coupler 1-2, the pulse amplifying module, the pulse compression device and the beam collimating device are sleeved on the outer sides with a pulse light source housing, and the pulse seed source 1-1, the spectroscopic coupler 1-2, the pulse amplifying module, the pulse compression device and the beam collimating device are covered by the pulse light source housing, and a light outlet is arranged on the pulse light source housing, which not only can use the pulse light source housing to protect the pulse seed source 1-1, the spectroscopic coupler 1-2, the pulse amplifying module, the pulse compression device and the beam collimating device from damage, but also has a simple structure and will not affect the normal transmission of the light beam.

[0037] The temperature sensor is arranged in the pulse light source housing to detect the temperature inside the pulse light source housing, and the controller 5 is connected to the temperature sensor and the water-cooled radiator 6 by signal to control the temperature inside the pulse light source housing.

[0038] By setting a temperature sensor in the pulse light source shell, the temperature of the pulse light source shell can be detected by the temperature sensor, and then the temperature information is fed back to the controller 5. The controller 5 controls the water-cooled radiator 6 to dissipate heat for the equipment in the pulse light source shell, thereby providing a stable and good working environment for the equipment in the pulse light source shell.

[0039] According to one embodiment of the present invention, the controller 5 signals connect the pulse seed source 1-1, the spectroscopic coupler 1-2, the pulse amplification module, the pulse compression device and the beam collimation device to control the output parameters of the sub-beam. In other words, the controller 5 can also control the pulse seed source 1-1, the spectroscopic coupler 1-2, the pulse amplification module, the pulse compression device and the beam collimation device, and adjust the output parameters of the sub-beam by controlling the working states of the pulse seed source 1-1, the spectroscopic coupler 1-2, the pulse amplification module, the pulse compression device and the beam collimation device to ensure that the sub-beam meets the requirements of ionization imaging.

[0040] The controller 5 can also be connected to the galvanometer assembly 3 via a signal, and the computer transmits the control program to the controller 5 . The controller 5 controls the galvanometer assembly 3 to adjust the transmission direction of each sub-beam so that the sub-beams intersect at a specified position and ionize the air to form a holographic real image 4 .

[0041] According to one embodiment of the present invention, the pulse amplification module includes: a pre-amplification module and a main amplification module, and the pre-amplification module is located between the main amplification module and the optical splitter coupler 1-2. In other words, the pulse amplification module is composed of the pre-amplification module and the main amplification module, and the sub-beam first passes through the pre-amplification module and then passes through the main amplification module, which can improve the amplification effect of the pulse amplification module on the sub-beam.

[0042] According to one embodiment of the present invention, the pulse width of the plurality of sub-beams is 10 fs-100 ns, the pulse energy is 10 μJ-100 mJ, and the pulse repetition frequency is 50 Hz-10 MHz.

[0043] Other structures and operations according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0044] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0045] In the description of the present invention, "plurality" means two or more.

[0046] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0047] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0049] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A three-dimensional aerial imaging device based on light beam intersection ionization of air, characterized in that: include: A pulse seed source, wherein the pulse seed source generates a pulse light beam; A splitter coupler, which is arranged on the line of the pulse light beam and is used to split the pulse light beam into a plurality of sub-beams; A plurality of galvanometer mirror assemblies, each of which is disposed on the plurality of sub-beam lines in a one-to-one correspondence, and is used to change the irradiation direction of the sub-beams in the horizontal or vertical direction so as to make the plurality of sub-beams intersect in the air and ionize the air to form a holographic real image; A plurality of pulse amplification modules, each of which is arranged on the lines of the plurality of sub-beams in a one-to-one correspondence to amplify the pulses of the sub-beams, and the pulse amplification modules are located between the galvanometer assembly and the spectroscopic coupler; A plurality of time delay lines are arranged one by one on the lines of the plurality of sub-beams, and the time delay lines are located between the pulse amplification module and the galvanometer assembly, and the time delay lines are used to adjust the pulse time position of the sub-beams so that the plurality of pulse times overlap when the sub-beams meet at the intersection point.

2. The three-dimensional aerial imaging device based on light beam intersection ionization of air according to claim 1, characterized in that: Also includes: A plurality of pulse compression devices are arranged one by one on the lines of the plurality of sub-beams, and the pulse compression devices are located between the pulse amplification module and the time delay line, and the pulse compression devices are used to compress the pulse width of the sub-beams to increase the peak power of the pulse light of the sub-beams.

3. The three-dimensional aerial imaging device based on light beam intersection ionization of air according to claim 2, characterized in that: Also includes: A plurality of beam collimating devices are arranged one by one on the lines of the plurality of sub-beams, and the beam collimating devices are located between the pulse compression device and the time delay line, and the beam collimating devices are used to adjust the sub-beams into collimated beams that meet the ionization threshold.

4. The three-dimensional aerial imaging device based on light beam intersection ionization of air according to claim 3, characterized in that: Also includes: A water-cooled radiator is connected to the pulse seed source, the spectroscopic coupler, the pulse amplification module, the pulse compression device and the beam collimation device to dissipate heat for the pulse seed source, the spectroscopic coupler, the pulse amplification module, the pulse compression device and the beam collimation device.

5. The three-dimensional aerial imaging device based on light beam intersection ionization of air according to claim 4, characterized in that: Also includes: A pulse light source housing, wherein the pulse seed source, the spectroscopic coupler, the pulse amplification module, the pulse compression device and the beam collimation device are all arranged in the pulse light source housing, and a plurality of light outlets for the sub-beams to pass through are formed on the pulse light source housing; A temperature sensor, the temperature sensor is arranged in the pulse light source housing and is used to detect the temperature inside the pulse light source housing; A controller, wherein the controller signal is connected to the temperature sensor and the water-cooled radiator, and is used to control the temperature inside the pulse light source housing.

6. The three-dimensional aerial imaging device based on light beam intersection ionization of air according to claim 5, characterized in that: The controller signal connects the pulse seed source, the light splitting coupler, the pulse amplification module, the pulse compression device and the beam collimation device to control the output parameters of the sub-beam.

7. The three-dimensional aerial imaging device based on light beam intersection ionization of air according to claim 1, characterized in that: The pulse amplification module comprises: a pre-amplification module and a main amplification module, and the pre-amplification module is located between the main amplification module and the optical splitter coupler.

8. The three-dimensional aerial imaging device based on light beam intersection ionization of air according to claim 1, characterized in that: The pulse width of the plurality of sub-beams is 10 fs-100 ns, the pulse energy is 10 μJ-100 mJ, and the pulse repetition frequency is 50 Hz-10 MHz.

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