WO2021143814A1

WO2021143814A1 - Three-dimensional aerial imaging device based on light beam intersection and air ionization

Info

Publication number: WO2021143814A1
Application number: PCT/CN2021/072067
Authority: WO
Inventors: 范超; 韩东成
Original assignee: 安徽省东超科技有限公司
Priority date: 2020-01-16
Filing date: 2021-01-15
Publication date: 2021-07-22

Abstract

A three-dimensional aerial imaging device based on light beam intersection and air ionization, comprising a pulse seed source (1-1), a light splitting coupler (1-2), a plurality of galvanometer assemblies (3), a plurality of pulse amplification modules, and a plurality of time delay lines (2). The pulse seed source (1-1) generates a pulse light beam; the light splitting coupler (1-2) is provided on a line of the pulse light beam and used for splitting the pulse light beam into a plurality of sub-light beams; the plurality of galvanometer assemblies (3) is provided on lines of the plurality of sub-light beams in a one-to-one correspondence manner and used for changing irradiation directions of the sub-light beams in a horizontal or vertical direction; the plurality of pulse amplification modules is provided on the lines of the plurality of sub-light beams in a one-to-one correspondence manner and used for amplifying pulses of the sub-light beams, and the pulse amplification modules are located between the galvanometer assemblies (3) and the light splitting coupler (1-2); the plurality of time delay lines (2) is provided on the lines of the plurality of sub-light beams in a one-to-one correspondence manner, the time delay lines are located between the pulse amplification modules and the galvanometer assemblies (3), and the time delay lines are used for adjusting pulse time positions of the sub-light beams so that a plurality of pulse times are coincided when the sub-light beams are intersected at an intersection point.

Description

Three-dimensional aerial imaging device based on beam intersection ionized air

Cross-references to related applications

This application requires the priority of Chinese patent application numbers "202010048276.2" and "202020099628.2" filed by Anhui Dongchao Technology Priority Company on January 16, 2020, titled "A three-dimensional aerial imaging device based on beam intersection ionized air" .

Technical field

The present disclosure relates to the field of air display, and in particular, to a three-dimensional aerial imaging device based on light beams intersecting ionized air.

Background technique

The existing air ionization system is divided into a plane display air ionization system and a three-dimensional display air ionization system. The flat display air ionization system includes three modules of high-power pulsed light source, beam control and air ionization. The beam control module is composed of a two-dimensional high-speed scanning galvanometer and a flat-field focusing lens. The galvanometer system is composed of galvanometers in the x-direction and y-direction, which can scan the reflected beam in a plane; the flat-field focusing lens forms a uniform-sized focused spot of the beam in the entire plane. For the stereoscopic display air ionization system, a zoom lens is added to the flat display system. The zoom lens changes the position in the z direction at the focal point of the ionization zone by changing the focal length of the lens, and combines the x-direction and y-direction galvanometers to control the ionization point to change in the stereo space to form a stereo picture. In order to increase the pixels of the display screen, a Spatial Light Modulator (SLM) is added to the beam control system to achieve the purpose of light wave modulation by modulating parameters such as the amplitude, phase, and polarization of the light field. The output beam of the pulsed light source is modulated by the SLM light field, and after the zoom system, multiple focal points are formed, so the pixels of the display screen are increased.

In the existing stereoscopic display air ionization system, the laser pulse output by the high-power pulsed light source is modulated by the SLM light field, and then reflected to the galvanometer system to adjust its exit direction. The beam passes through the zoom lens and the flat field focusing lens and then is focused into the air ionization area. At the designated point, the high-power laser ionizes the air molecules to form a luminous bright spot. The computer actively controls the SLM, the galvanometer system, and the zoom lens, and adjusts the position of the laser ionization point and the pixels of the display image according to the image to be displayed.

Due to the limitation of the deflection angle of the galvanometer in the galvanometer system and the limitation of the size of the zoom lens, the air ionization system has a small display image range and cannot meet the aerial display requirements of a larger image.

Summary of the invention

The present disclosure aims to solve at least one of the technical problems existing in the prior art. To this end, the present disclosure provides a three-dimensional aerial imaging device based on beam intersection ionizing air, which divides the pulsed light source into multiple sub-beams and converges in the air to solve the synchronization problem between pulses at the intersection point, and at the intersection of the beams The generation of air ionization solves the technical problem of the small display range of the air ionization system caused by various factors in the display system, and significantly increases the range of the air ionization display area.

The three-dimensional aerial imaging device based on beam intersection ionized air according to an embodiment of the present disclosure includes: a pulse seed source, a beam splitter, a plurality of galvanometer components, a plurality of pulse amplification modules, and a plurality of time delay lines. The pulse seed source A pulsed beam is generated, the splitting coupler is arranged on the line of the pulsed beam for dividing the pulsed beam into a plurality of sub-beams, and a plurality of the galvanometer components are arranged on the plurality of the sub-beam lines in a one-to-one correspondence The above is used to change the irradiation direction of the sub-beams in the horizontal or vertical direction to converge a plurality of the sub-beams at the intersection and ionize the air to form a holographic real image, and a plurality of the pulse amplification modules are one by one Correspondingly arranged on the lines of the multiple sub-beams for amplifying the pulses of the sub-beams, and the pulse amplifying module is located between the galvanometer assembly and the light splitting coupler. The time delay line is arranged on the lines of the multiple sub-beams in a one-to-one correspondence, and the time delay line is located between the pulse amplifying module and the galvanometer assembly, and the time delay line is used for adjusting all the sub-beams. The pulse time position of the sub-beams is such that when the sub-beams converge at the intersection point, multiple pulses are time coincident.

According to the three-dimensional aerial imaging device based on beam intersection ionized air, the pulse beam is divided into multiple sub-beams by using a splitting coupler, and the multiple sub-beams undergo amplification processing, time delay processing and steering processing and then merge. The same pulse beam is divided, thereby solving the problem of pulse time synchronization between sub-beams. In addition, multiple galvanometer components are used to control multiple sub-beams for intersecting and ionization, which can increase the area of the sub-beams' intersection points, thereby expanding the imaging range of the three-dimensional aerial imaging device.

According to an embodiment of the present disclosure, the three-dimensional aerial imaging device further includes: a plurality of pulse compression devices, the plurality of pulse compression devices are arranged on the lines of the plurality of sub-beams in a one-to-one correspondence, and the pulse compression device Located between the pulse amplification module and the time delay line, the pulse compression device is used for compressing the pulse width of the sub-beam to increase the pulse light peak power of the sub-beam.

According to an embodiment of the present disclosure, the three-dimensional aerial imaging device further includes: a plurality of beam collimating devices, a plurality of the pulsed beam collimating devices are arranged on the lines of the plurality of sub-beams in a one-to-one correspondence, and the The beam collimating device is located between the pulse compression device and the time delay line, and the beam collimating device is used to adjust the sub-beam into a collimated beam that meets the ionization threshold.

According to an embodiment of the present disclosure, the three-dimensional aerial imaging device further includes: a water-cooled radiator connected to the pulse seed source, the spectrocoupler, the pulse amplification module, the pulse compression device and the The beam collimating device is used for dissipating heat for the pulse seed source, the light splitting coupler, the pulse amplification module, the pulse compression device, and the beam collimating device.

According to an embodiment of the present disclosure, the three-dimensional aerial imaging device further includes: a pulse light source housing, a temperature sensor and a controller, the pulse seed source, the spectrocoupler, the pulse amplification module, the pulse compression device, and The beam collimation devices are all arranged in the pulse light source housing, the pulse light source housing is formed with a plurality of light outlets for the sub-beams to pass through, and the temperature sensor is arranged in the pulse light source housing The controller is used for detecting the temperature inside the pulse light source housing, and the controller is used for signal connection between the temperature sensor and the water cooling radiator for controlling the temperature inside the pulse light source housing.

According to an embodiment of the present disclosure, the controller signally connects the pulse seed source, the beam splitter, the pulse amplification module, the pulse compression device, and the beam collimation device to control the sub-beam The output parameters.

According to an embodiment of the present disclosure, the pulse amplifying module includes: a pre-amplifying module and a main amplifying module, and the pre-amplifying module is located between the main amplifying module and the optical splitter coupler.

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

The additional aspects and advantages of the present disclosure will be partially given in the following description, and some will become obvious from the following description, or be understood through the practice of the present disclosure.

Description of the drawings

The above and/or additional aspects and advantages of the present disclosure will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Fig. 1 is a schematic structural diagram of a three-dimensional aerial imaging device based on beam intersection ionized air according to an embodiment of the present disclosure.

Reference signs:

1-1: Pulse seed source; 1-2: Spectrocoupler; 1-3: First pulse amplification module; 1-4: Second pulse amplification module; 1-5: First pulse compression device; 1-6: The second pulse compression device; 1-7; the first beam collimating device; 1-8: the second beam collimating device; 2: the time delay line; 2-1: the first time delay line; 2-2: the 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 ways

The embodiments of the present disclosure are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary, and are only used to explain the present disclosure, and cannot be understood as a limitation to the present disclosure.

Hereinafter, a three-dimensional aerial imaging device based on beam intersection ionized air according to an embodiment of the present disclosure will be described with reference to FIG. 1.

As shown in FIG. 1, the three-dimensional aerial imaging device based on beam intersection ionized air according to an embodiment of the present disclosure includes: a pulse seed source 1-1, a beam splitter 1-2, multiple galvanometer components 3, and multiple pulse amplification Module and multiple time delay lines 2.

Specifically, the pulse seed source 1-1 can generate a pulse beam, and the splitting coupler 1-2 is arranged on the line of the pulse beam and adjacent to the pulse seed source 1-1, and is used to split the pulse beam into The multiple sub-beams and the pulsed beam are irradiated on the light splitting coupler 1-2 and divided into multiple sub-beams. Among them, the energy of the multiple sub-beams can be evenly distributed. In general, the pulsed beam can be divided into two sub-beams.

Wherein, a plurality of the galvanometer assemblies 3 are provided on a plurality of the sub-beam lines in a one-to-one correspondence, and are used to change the irradiation direction of the sub-beams in a horizontal or vertical direction to combine the plurality of sub-beams. At the intersection point, the air is converged and ionized to form a holographic real image 4, and a plurality of the pulse amplification modules are arranged on the lines of the plurality of sub-beams in a one-to-one correspondence for amplifying the pulses of the sub-beams, And the pulse amplifying module is located between the galvanometer assembly 3 and the light splitting coupler 1-2, and a plurality of the time delay lines 2 are arranged on the lines of the plurality of sub-beams in a one-to-one correspondence, and The time delay line 2 is located between the pulse amplifying module and the galvanometer assembly 3, and the time delay line 2 is used to adjust the pulse time position of the sub-beams so that the sub-beams converge at the intersection point. Multiple pulse times coincide.

As shown in Figure 1, taking two sub-beams as an example, the three-dimensional aerial imaging device includes: a pulse seed source 1-1, a beam splitter 1-2, two galvanometer components 3, two pulse amplification modules and two time delays Line 2, the two galvanometer assemblies 3 are the first galvanometer assembly 3-1 and the second galvanometer assembly 3-2, and the two pulse amplification modules are the first pulse amplification module 1-3 and the second pulse amplification module respectively 1-4, the two time delay lines 2 are the first time delay line 2-1 and the second time delay line 2-2, respectively.

The pulse beam generated by the pulse seed source 1-1 is passed through the split coupler 1-2 to form two sub-beams, which are the first sub-beam and the second sub-beam respectively. The first galvanometer assembly 3-1 and the first pulse amplifying module 1- 3 and the first time delay line 2-1 are arranged on the first sub-beam, 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 superior.

That is to say, in the forward direction of each sub-beam, a pulse amplifying module, a time delay line 2 and a galvanometer assembly 3 are arranged in sequence, and the sub-beam energy split by the splitter coupler 1-2 is relatively low. After the pulse amplifying module Then, the energy of the sub-beams rises, and then the time delay line 2 is passed to ensure that the multiple pulses in the multiple sub-beams are synchronized in time. After the sub-beams enter the galvanometer assembly 3 and change the irradiation direction, the multiple sub-beams will intersect in the air. The energy of the beams converge to reach the threshold of air ionization, and multiple sub-beams ionize the air at the intersection point to form a holographic real image 4.

According to the three-dimensional aerial imaging device based on beam intersection ionized air according to the embodiment of the present disclosure, the pulse beam is divided into a plurality of sub-beams by the splitting coupler 1-2, and the plurality of sub-beams are converged after amplification processing, time delay processing and steering processing. Each sub-beam is divided into the same pulse beam, which can solve the problem of time synchronization between multiple pulses in the sub-beam. In addition, multiple galvanometer assemblies 3 are used to control multiple sub-beams to perform cross-ionization, which can increase the area of the sub-beams’ converging points, thereby expanding the imaging range of the three-dimensional aerial imaging device.

As shown in FIG. 1, in some specific embodiments, the three-dimensional aerial imaging device further includes a plurality of pulse compression devices, and the plurality of pulse compression devices are arranged on the lines of the plurality of sub-beams in a one-to-one correspondence. The pulse compression device is 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 provided in all the sub-beams. Between the pulse amplification module and the time delay line 2, the pulse compression device is used to compress the pulse width of the sub-beam to increase the pulse light peak power of the sub-beam.

As shown in Figure 1, 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. Two pulse compression devices 1-6 are arranged on the second sub-beam. By providing a pulse compression device on the sub-beam, the peak power of the pulse light of the sub-beam can be increased, and the laser power density at the intersection of the sub-beam can be increased, which is beneficial to lower the ionization threshold and improve the imaging effect.

As shown in FIG. 1, in some specific embodiments, the three-dimensional aerial imaging device further includes a plurality of beam collimating devices, and a plurality of the pulsed beam collimating devices are arranged on the lines of the plurality of sub-beams in a one-to-one correspondence. , And the beam collimating device is located between the pulse compression device and the time delay line 2, that is to say, each sub-beam is provided with a beam collimating device, and the beam is collimated in the forward direction of the sub-beam The straightening device is located between the pulse compression device on the sub-beam and the time delay line 2, and the beam collimating device can adjust the sub-beam into a collimated beam that meets the ionization threshold.

Among them, there are two beam collimating devices, namely the first beam collimating device 1-7 and the second beam collimating device 1-8. The first beam collimating device 1-7 is arranged on the first sub-beam. The two beam collimating devices 1-8 are arranged on the second sub-beam. By arranging a beam collimating device on the sub-beam, the beam collimating device can be used to adjust the beam parameters of the sub-beam to ensure that the sub-beam meets the requirement of ionization threshold, thereby improving the effect of ionization imaging.

According to an embodiment of the present disclosure, the three-dimensional aerial imaging device further includes a water-cooled radiator 6, which is connected to the pulse seed source 1-1, the spectrocoupler 1-2, the pulse amplification module, The pulse compression device and the beam collimation device are used to collimate the pulse seed source 1-1, the beam splitter 1-2, the pulse amplification module, the pulse compression device, and the beam Device heat dissipation.

Since the pulse seed source 1-1 generates a high-energy pulse light source, and the beam passes through the beam splitter 1-2, the pulse amplification module, the pulse compression device, and the beam collimator in sequence, the pulse seed The source 1-1, the optical splitter 1-2, the pulse amplification module, the pulse compression device, and the beam collimator will generate a lot of heat during the working process. By installing a water-cooled radiator 6, it can be Heat the pulse seed source 1-1, the beam splitter 1-2, the pulse amplification module, the pulse compression device, and the beam collimator device to prevent the pulse seed source 1-1, Excessive concentration of heat on the light splitting coupler 1-2, the pulse amplification module, the pulse compression device, and the beam collimation device causes equipment damage. In addition, the water-cooling radiator 6 can adjust the heat dissipation area by adjusting the flow direction of the water path, which has strong controllability and can dissipate heat for multiple devices at the same time, and the cost of water cooling is low, the effect is good, and it can meet the heat dissipation requirements of the three-dimensional aerial imaging device.

According to an embodiment of the present disclosure, the three-dimensional aerial imaging device further includes: a pulse light source housing, a temperature sensor, and a controller 5.

The pulse seed source 1-1, the beam splitter 1-2, the pulse amplification module, the pulse compression device, and the beam collimation device are all arranged in the pulse light source housing, and the pulse light source A plurality of light exit ports for the sub-beams to pass through are formed on the housing, that is, the pulse seed source 1-1, the beam splitter 1-2, the pulse amplification module, and the pulse compression The device and the beam collimating device are sheathed with a pulse light source housing, and the pulse seed source 1-1, the beam splitter 1-2, the pulse amplification module, and the pulse source are covered by the pulse light source housing. The pulse compression device and the beam collimation device are provided with a light outlet on the pulse light source housing, which can not only use the pulse light source housing to protect the pulse seed source 1-1, the beam splitter 1-2, and the The pulse amplifying module, the pulse compression device and the beam collimation device are not damaged, and the structure is simple, which will not affect the normal transmission of the beam.

Wherein, the temperature sensor is arranged in the pulse light source housing for detecting the temperature inside the pulse light source housing, and the controller 5 is signally connected to the temperature sensor and the water-cooled radiator 6, and is used to control the The temperature in the housing of the pulse light source.

By setting a temperature sensor in the pulse light source housing, the temperature sensor can be used to detect the temperature of the pulse light source housing, and then feedback the temperature information to the controller 5, and the controller 5 controls the water-cooled radiator 6 to dissipate heat from the equipment in the pulse light source housing. Provide a stable and good working environment for the equipment in the pulse light source housing.

According to an embodiment of the present disclosure, the controller 5 signally connects the pulse seed source 1-1, the optical splitter 1-2, the pulse amplification module, the pulse compression device, and the beam collimator The device is used to control the output parameters of the sub-beams. In other words, the controller 5 can also control the pulse seed source 1-1, the optical splitter 1-2, the pulse amplification module, the pulse compression device, and the beam collimator, and control The working states of the pulse seed source 1-1, the beam splitter 1-2, the pulse amplification module, the pulse compression device, and the beam collimation device adjust the output parameters of the sub-beam to ensure that the sub-beam meets Requirements for ionization imaging.

Among them, the controller 5 can also signal the galvanometer assembly 3, the computer transmits the control program to the controller 5, and the controller 5 controls the galvanometer assembly 3 to adjust the transmission direction of each sub-beam so that the sub-beams converge at a designated position And ionize the air to form a holographic real image 4.

According to an embodiment of the present disclosure, the pulse amplifying module includes: a pre-amplifying module and a main amplifying module, and the pre-amplifying module is located between the main amplifying module and the optical splitter 1-2. In other words, the pulse amplification module is composed of a pre-amplification module and a main amplification module. The sub-beams first pass through the pre-amplification module and then the main amplification module, which can enhance the amplification effect of the pulse amplification module on the sub-beams.

Other configurations and operations according to the embodiments of the present disclosure are known to those of ordinary skill in the art, and will not be described in detail here.

In the description of the present disclosure, “first feature” and “second feature” may include one or more of these features.

In the description of the present disclosure, "plurality" means two or more.

In the description of the present disclosure, the "above" or "below" of the first feature of the second feature may include the first and second features in direct contact, or may include the first and second features not in direct contact but through them Another feature contact between.

In the description of the present disclosure, “above”, “above” and “above” the second feature of the first feature includes the first feature directly above and diagonally above the second feature, or only means that the first feature is higher than The second feature.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" etc. means to incorporate the implementation The specific features, structures, materials or characteristics described by the examples or examples are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment or example.

Although the embodiments of the present disclosure have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and modifications can be made to these embodiments without departing from the principle and purpose of the present disclosure. The scope of the present disclosure is defined by the claims and their equivalents.

Claims

A three-dimensional aerial imaging device based on beam intersection ionized air, which is characterized in that it comprises:

A pulsed seed source, which generates a pulsed light beam;

A light splitting coupler, the light splitting 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 galvanometer components are provided on the plurality of sub-beam lines in a one-to-one correspondence, and are used to change the irradiation direction of the sub-beams in the horizontal or vertical direction to combine the plurality of sub-beams. The sub-beams meet in the air and ionize the air to form a holographic real image;

A plurality of pulse amplifying modules, the plurality of pulse amplifying modules are arranged on the lines of the plurality of sub-beams in a one-to-one correspondence for amplifying the pulses of the sub-beams, and the pulse amplifying modules are located in the Between the galvanometer assembly and the light splitting coupler;

A plurality of time delay lines, the plurality of time delay lines are arranged on the lines of the plurality of sub-beams in a one-to-one correspondence, and the time delay line is located between the pulse amplifying module and the galvanometer assembly, The time delay line is used to adjust the pulse time position of the sub-beams so that multiple pulses coincide in time when the sub-beams converge at the intersection point.
The three-dimensional aerial imaging device based on beam intersection ionized air according to claim 1, characterized in that it further comprises:

A plurality of pulse compression devices, the plurality of pulse compression devices are arranged on the lines of the plurality of sub-beams in a one-to-one correspondence, and the pulse compression device is located between the pulse amplification module and the time delay line, The pulse compression device is used for compressing the pulse width of the sub-beam to increase the pulse light peak power of the sub-beam.
The three-dimensional aerial imaging device based on beam intersection ionized air according to claim 2, characterized in that it further comprises:

A plurality of beam collimating devices, a plurality of the pulsed beam collimating devices are arranged on the lines of the plurality of sub-beams in a one-to-one correspondence, and the beam collimating devices are located between the pulse compression device and the time delay Between lines, the beam collimating device is used to adjust the sub-beam into a collimated beam that meets the ionization threshold.
The three-dimensional aerial imaging device based on beam intersection ionized air according to claim 3, further comprising:

A water-cooled radiator, which is connected to the pulse seed source, the beam splitter, the pulse amplification module, the pulse compression device, and the beam collimator for providing the pulse seed source and the beam collimator. The light splitting coupler, the pulse amplification module, the pulse compression device and the beam collimation device dissipate heat.
The three-dimensional aerial imaging device based on beam intersection ionized air according to claim 4, further comprising:

Pulse light source housing, said pulse seed source, said beam splitter, said pulse amplifying module, said pulse compression device and said beam collimating device are all arranged in said pulse light source housing, said pulse light source housing A plurality of light exit ports for the sub-beams to pass through are formed on the body;

A temperature sensor, the temperature sensor being arranged in the pulse light source housing for detecting the temperature inside the pulse light source housing;

A controller, the controller signally connects the temperature sensor and the water-cooled radiator, and is used for controlling the temperature in the pulse light source housing.
The three-dimensional aerial imaging device based on beam intersection ionized air according to claim 5, wherein the controller is signally connected to the pulse seed source, the light splitter coupler, the pulse amplification module, and the pulse compression The device and the beam collimating device are used to control the output parameters of the sub-beam.
The three-dimensional aerial imaging device based on beam intersection ionized air according to claim 1, wherein 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 main amplification module. Between the optical splitter coupler.
The three-dimensional aerial imaging device based on beam intersection ionized air according to claim 1, wherein the pulse width of the multiple sub-beams is 10fs-100ns, the pulse energy is 10μJ-100mJ, and the pulse repetition frequency is 50Hz-10MHz .