CN113552588B - Optical phased array imager - Google Patents

Optical phased array imager Download PDF

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Publication number
CN113552588B
CN113552588B CN202110789454.1A CN202110789454A CN113552588B CN 113552588 B CN113552588 B CN 113552588B CN 202110789454 A CN202110789454 A CN 202110789454A CN 113552588 B CN113552588 B CN 113552588B
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imaging
light
scanning
opa
imaged
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CN113552588A (en
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王子豪
廖家莉
孙艳玲
范华庆
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Xidian University
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Xidian University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4817—Constructional features, e.g. arrangements of optical elements relating to scanning

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The invention relates to an optical phased array imager, comprising: the light beam emission module is used for emitting scanning light beams and pseudo-thermal light; the echo detection module is used for acquiring a scanning echo signal and a light intensity echo signal of a target to be imaged; the imaging module is used for imaging the target to be imaged through ghost imaging according to the scanning echo signal and the light intensity echo signal; the light beam emission module comprises a plurality of light beam emission units for realizing 360-degree full-view-field coverage, the light beam emission units comprise scanning OPA chips and imaging OPA chips, the scanning OPA chips are used for emitting scanning light beams for realizing far-field scanning, the imaging OPA chips are used for emitting pseudo-thermal light for realizing ghost imaging, and the distribution of the pseudo-thermal light in space is periodic. The optical phased array imager can capture the fast moving object and realize the fast imaging of the moving object in the light field range.

Description

Optical phased array imager
Technical Field
The invention belongs to the technical field of laser radars, and particularly relates to an optical phased array imager.
Background
The existing imagers have the problems of large volume, wide field of view, mechanical movement requirement, low imaging resolution and the like, and lack of accurate imaging capability for objects moving at high speed. With the development of LIDAR technology, optical phased array technology is attracting more and more attention. The chip-level optical phased array has the characteristics of small volume, high integration level, high scanning speed and low cost, and has very good application prospect in the detection imaging field. However, the current imager based on the optical phased array technology is difficult to realize imaging with large field of view, ultra-high speed and high resolution.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides an optical phased array imager. The technical problems to be solved by the invention are realized by the following technical scheme:
the invention provides an optical phased array imager, comprising:
the light beam emission module is used for emitting scanning light beams and pseudo-thermal light;
the echo detection module is used for acquiring a scanning echo signal and a light intensity echo signal of a target to be imaged;
the imaging module is used for imaging the target to be imaged through ghost imaging according to the scanning echo signal and the light intensity echo signal;
the light beam emission module comprises a plurality of light beam emission units for realizing 360-degree full-view-field coverage, the light beam emission units comprise scanning OPA chips and imaging OPA chips, the scanning OPA chips are used for emitting scanning light beams for realizing far-field scanning, the imaging OPA chips are used for emitting pseudo-thermal light for realizing ghost imaging, and the distribution of the pseudo-thermal light in space is periodic.
In one embodiment of the present invention, the plurality of light beam emitting units are distributed in a ring shape, and the ring-shaped center is provided with one light beam emitting unit.
In one embodiment of the present invention, the echo detection module is an area array detector.
In one embodiment of the present invention, the imaging module includes a speed measurement unit and a calculation imaging unit, where the speed measurement unit is configured to calculate, according to the scanning echo signal, a first moving speed component and a second moving speed component of the object to be imaged;
the calculation imaging unit is used for combining the first moving speed component and the second moving speed component to calculate a reference light field of the target to be imaged; obtaining a signal light field of the target to be imaged according to the light intensity echo signal; and imaging the object to be imaged by using ghost imaging according to the reference light field and the signal light field.
In one embodiment of the present invention, the first moving speed component is a moving speed component of the object to be imaged in a plane perpendicular to a light propagation direction;
the second moving speed component is a moving speed component of the object to be imaged in a direction parallel to the light propagation direction.
In one embodiment of the present invention, the optical phased array imager further comprises:
and the control module is used for controlling the scanning OPA chip to emit scanning light beams to realize far-field scanning when the imager is in an initial working state, and controlling the imaging OPA chip to emit pseudo-heat light to realize ghost imaging after the speed measurement is completed.
Compared with the prior art, the invention has the beneficial effects that:
1. the optical phased array imager provided by the invention has the advantages that the arranged light beam emission unit comprises the scanning OPA chip and the imaging OPA chip, the scanning OPA chip is used for emitting scanning light beams to realize far-field scanning, the imaging OPA chip is used for emitting pseudo-thermal light to realize ghost imaging, and the design of the antenna arrays in the scanning OPA chip and the imaging OPA chip is changed, so that the field of view corresponding to the OPA chip can be increased, and high-resolution three-dimensional imaging is realized;
2. according to the optical phased array imager, the plurality of light beam emitting units are arranged to form the light beam emitting module, and 360-degree full-view coverage can be realized without mechanical movement;
3. the optical phased array imager can capture the fast moving object and realize the fast imaging of the moving object in the light field range.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.
Drawings
FIG. 1 is a block diagram of an optical phased array imager according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an OPA chip according to an embodiment of the present invention;
FIG. 3 is a graph of the effect of different duty cycle antennas of an OPA chip on the phased array field of view provided by an embodiment of the invention;
FIG. 4 is an imaging schematic diagram of an optical phased array imager according to an embodiment of the invention;
fig. 5 is a schematic structural diagram of an echo detection module of a beam emission module according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a light beam emitting module according to an embodiment of the present invention;
FIG. 7 is a graph of simulation results of a periodic distribution of an output pseudo-thermal light field of an imaging OPA chip provided by an embodiment of the invention;
FIG. 8 is a schematic diagram of movement of an object to be imaged in a periodic pseudo-thermal light field provided by an embodiment of the present invention;
FIG. 9 is a block diagram of another optical phased array imager according to an embodiment of the invention;
FIG. 10 is a diagram of experimental simulation results of an imager provided in an embodiment of the present invention;
fig. 11 is a graph of experimental results of an imager according to an embodiment of the present invention.
Detailed Description
In order to further illustrate the technical means and effects adopted by the invention to achieve the preset aim, the following describes an optical phased array imager according to the invention in detail with reference to the attached drawings and the detailed description.
The foregoing and other features, aspects, and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments when taken in conjunction with the accompanying drawings. The technical means and effects adopted by the present invention to achieve the intended purpose can be more deeply and specifically understood through the description of the specific embodiments, however, the attached drawings are provided for reference and description only, and are not intended to limit the technical scheme of the present invention.
Example 1
Referring to fig. 1, fig. 1 is a block diagram of an optical phased array imager according to an embodiment of the present invention, as shown in the drawing, the optical phased array imager of the embodiment includes:
the light beam emission module is used for emitting scanning light beams and pseudo-thermal light;
the echo detection module is used for acquiring a scanning echo signal and a light intensity echo signal of a target to be imaged;
and the imaging module is used for imaging the target to be imaged through ghost imaging according to the scanning echo signal and the light intensity echo signal.
The light beam emitting module comprises a plurality of light beam emitting units to realize 360-degree full-view field coverage. Further, the light beam emitting unit includes a scanning OPA chip for emitting a scanning light beam to realize far-field scanning, and an imaging OPA chip for emitting pseudo-thermal light to realize ghost imaging, wherein the distribution of the pseudo-thermal light in space is periodic.
In this embodiment, the scanning echo signal is an echo signal obtained after the scanning beam passes through the target; the light intensity echo signal is a light intensity signal obtained after pseudo-thermal light passes through the target.
In this embodiment, the beam emitting unit is formed by two OPA chips (a scanning OPA chip and an imaging OPA chip), one of which is used for scanning and the other of which is used for imaging, and the two OPA chips each include a plurality of antennas, and the plurality of antennas are arranged in an array, and it is to be noted that the antenna array structure parameters of the two OPA chips are different.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an OPA chip according to an embodiment of the invention, specifically, in this embodiment, the scanning OPA chip includes a plurality of first antennas arranged in an array, wherein by increasing the size (a x And a y ) And the distance (d) between the adjacent first antennas x And d y ) To achieve an increase in scan field of view of the scanned OPA chip. That is, in scanning OPA chips, the duty cycle of the antenna is as large as possible, i.e., a x /d x ，a y /d y Is as large as possible, which can provide a larger scan field of view.
In this embodiment, the imaging OPA chip comprises a plurality of second antennas arranged in an array, wherein the imaging OPA chip is formed by reducing the size (a x And a y ) To achieve an increase in the imaging field of view of the imaging OPA chip. That is, in the imaging OPA chip, the duty cycle of the antenna is as small as possible, i.e., a x ，a y Is as small as possible, thus providing a larger imaging field of view.
Referring to fig. 3 in combination, fig. 3 is the present inventionThe effect of the different duty cycle antennas of the OPA chip on the phased array field of view is shown in the figure, wherein the graph (a) shows that the graph (d x And d y ) Taking 4, a (a) x And a y ) Taking 3, the OAP far-field profile, and (b) is shown at d (d) x And d y ) Taking 8, a (a) x And a y ) Taking the far field profile of the OPA at 3.8, it can be seen from the figure that the larger the a/d, the larger the scan field of view range of the OPA, and the smaller the a, the smaller the envelope of the entire scan.
It should be noted that, the antenna array design of the OPA chip can be designed according to more practical situations, and only when the scanning OPA chip is designed, the duty ratio of the antenna is designed to be larger, and when the imaging OPA chip is designed, the duty ratio of the antenna is designed to be smaller, so that the scanning OPA chip and the imaging OPA chip can be ensured to provide a larger field of view, and specific design parameters are not limited.
Further, referring to fig. 6, fig. 6 is a schematic structural diagram of a light beam emitting module according to an embodiment of the present invention, as shown in the drawing, in this embodiment, a plurality of light beam emitting units are distributed in a ring shape, and a light beam emitting unit is disposed in the center of the ring shape. The beam emission unit can cover 60-degree view field, and of course, the view field range can be increased or decreased by designing the OPA chip, and 360-degree full view field coverage can be realized only by changing the arrangement mode of the beam emission module. The optical phased array imager of the embodiment forms a light beam emitting module by arranging a plurality of light beam emitting units, and can realize 360-degree full-view field coverage without mechanical movement.
It should be noted that, in other embodiments, the light beam emitting units may be arranged in an array to achieve 360 ° full field coverage, and the specific arrangement is not limited herein.
Further, referring to fig. 5, fig. 5 is a schematic structural diagram of an echo detection module of a beam emission module according to an embodiment of the present invention, as shown in the drawing, optionally, in this embodiment, the echo detection module is an area array detector.
Further, in the present embodiment, the imaging module includes a speed measurement unit and a calculation imaging unit.
The speed measuring unit is used for calculating a first moving speed component and a second moving speed component of the target to be imaged according to the scanning echo signals;
the imaging unit is used for calculating a reference light field of the target to be imaged by combining the first moving speed component and the second moving speed component; obtaining a signal light field of a target to be imaged according to the light intensity echo signal; and imaging the target to be imaged by using ghost imaging according to the reference light field and the signal light field.
In the present embodiment, the first moving speed component is a moving speed component of the object to be imaged in a plane perpendicular to the light propagation direction; the second moving speed component is a moving speed component of the object to be imaged in a direction parallel to the propagation direction of the light.
Specifically, in this embodiment, optionally, an image size recognition algorithm is used to determine the size of the target to be imaged, and then, according to the determined size of the target to be imaged, a TBD tracking algorithm is used to measure and obtain the first moving speed component of the target to be imaged. Optionally, a second movement velocity component of the object to be imaged is measured using doppler shift velocimetry. It should be noted that the speed measurement method is not limited to the above-mentioned measurement method.
Further, after the extraction of the moving speed of the target to be imaged is completed, a speed component is required to be added when the reference light field is calculated, and the moving speed of the target is met, so that the reference light field participating in the imaging calculation is ensured to be the light field just irradiated on the target at the moment, the reference light field participating in the calculation is required to be dynamically and real-time adjusted, and then the target is imaged by combining a dynamic ghost imaging algorithm.
Because an algorithm for calculating ghost images is adopted, the spatial corresponding light field distribution (namely a reference light field) of the target to be imaged can be calculated in advance in a calculation mode. Firstly, according to the two components of the obtained moving speed of the target to be imaged, combining the two components of the moving speed of the target, calculating the spatial light field distribution to obtain a reference light field of the target, then according to the light intensity echo signals, calculating to obtain a signal light field (signal light intensity) of the target, and finally, imaging according to the reference light field and the signal light intensity by using a ghost imaging algorithm.
In particular, with respect to the principles of ghost imaging, the advent of entangled two-photon imaging designed by Pittman et al in 1995 marked the formal birth of ghost imaging technology. The specific operation is that continuous laser is pumped onto BBO crystal, parametric down-conversion process occurs, and a pair of photon pairs with orthogonal polarization is generated: signal photons (extraordinary rays of the crystal) and reference photons (ordinary rays of the crystal). Then, the pump light and entangled photon pairs are separated by utilizing a prism, the entangled photon pairs are separated into two beams by a beam splitter sensitive to polarization, and the signal light is reflected by a beam splitter and then passes through a transmission type object to be detected and then is collected into a barrel detector by a lens; the reference light passes through the beam splitter and is collected by a "spot" detector that scans in the X-Y plane. And finally, carrying out coincidence measurement on the data collected by the barrel detector and the point detector to restore the image of the object to be detected. The special imaging means does not directly measure the transmission function of the object to be measured in a one-to-one manner in space like the traditional imaging, but uses the association between light beams to implement indirect measurement, and then the image is restored through calculation; in addition, the signal light path and the reference light path of the ghost image are separated.
It follows that ghost imaging is a non-local computational imaging technique. Specifically, in a common experimental system, a coherent light field generated by laser is changed into a random scattering light field after rotating ground glass, the random scattering light field is divided into two beams by a beam splitter, one beam of light is used as signal light, is focused by a condensing lens after passing through an object to be detected, and finally the total intensity of the signal light is measured by a barrel detector without resolution; after the other beam of light freely propagates a distance, its light field distribution is detected by a CCD camera with resolution. The light intensity measured by the two detectors is subjected to correlation operation, so that an image of the object to be measured can be obtained, and a second-order correlation function of the light field can be calculated.
Principle of computational imaging: the computing ghost imaging is a classical light field ghost imaging, a known associated light field is generated by utilizing a computing holographic technology, idle light paths for detecting light field distribution are omitted, the optical system structure is simpler, the capability of resisting external interference is stronger, the reconstruction of images is more efficient, the imaging effect is better, the computing ghost imaging inherits important characteristics of ghost imaging in the imaging principle, and the computing ghost imaging has more important practical application value for research than two-photon ghost imaging and pseudo-heat source ghost imaging. The imaging OPA chip in the embodiment is used as a pseudo-thermal light source, and can generate specific output light field distribution under specific driving voltage, so that the imaging OPA chip is a pseudo-thermal light source very suitable for calculating ghost images.
In this embodiment, the specific algorithm of ghost imaging and computed imaging is a conventional common algorithm, and the specific computing process is not described here.
Further, referring to fig. 9, fig. 9 is a block diagram of another optical phased array imager according to the embodiment of the present invention, where the optical phased array imager further includes a control module, where the control module is configured to control the scanning OPA chip to emit a scanning beam to implement far-field scanning when the imager is in an initial working state, and to control the imaging OPA chip to emit pseudo-thermal light to implement ghost imaging after the speed measurement is completed.
Optionally, the control module may employ an external control circuit, for controlling the scanning OPA chip to emit a scanning beam in an initial operating state of the imager, and controlling the imaging OPA chip to emit a pseudo-thermal light after the speed measurement is completed. The specific circuit configuration is not limited herein.
Referring to fig. 4 in combination for describing the imaging principle of the optical phased array imager of the present embodiment, fig. 4 is an imaging principle diagram of the optical phased array imager according to the embodiment of the present invention. As shown in the figure, the optical phased array imager of this embodiment is divided into two working states, in which: the initial operating state of the imager is a speed measurement operating state, in which an external control circuit loads sequential voltages to the scanning OPA chip, at which time the scanning OPA chip can realize sequential scanning of the field of view. When a target moves into a field of view, the target is scanned by light emitted by the scanning OPA chip, detected by the detector, a scanning echo signal is analyzed, the scanning position of a light beam is adjusted in real time, the size of the target to be imaged is calculated according to an image size recognition algorithm, and the moving speed and the moving track of the target to be imaged are judged according to the size of the target. After the object can be accurately tracked, the imaging working state is switched to, at the moment, the imaging OPA chip starts to work, a pseudo-thermal light field of a pulse signal is sent out, and then the light intensity result measured by the detector is analyzed according to a dynamic three-dimensional ghost imaging means. Therefore, an imaging algorithm is adjusted in real time to match the movement speed of the object, and imaging of the target is achieved.
Specifically, in combination with the speed result obtained by measurement and the total light intensity value (light intensity echo signal) obtained by measurement of the detector, the target is subjected to image recovery according to a ghost imaging formula, wherein the ghost imaging formula is as follows:
O μ (x，y)＝〈(B μ -<B μ >)(I(x，y)-<I(x，y)>)> (1)，
wherein B is μ For the intensity values recorded by the detector, I (x, y) is the distribution of the reference light field as a function of speed in real time.
In this embodiment, the distribution of the pseudo thermo-optical in the space is periodic, and the data amount required for the operation can be greatly reduced by utilizing the characteristic of the periodicity of the pseudo thermo-optical, so as to improve the imaging speed.
The pseudo-thermo-optical field generated by the imaging OPA chip has obvious periodic distribution, and the expression of the optical field of the imaging OPA chip is shown as follows:
U(θ x ，θ y )＝s(θ x ，θ y )·M(θ x ，θ y ) (2)，
U(θ x ,θ y ) Representing the far field distribution of OPA emissions, S (θ x ,θ y ) Representing the far-field envelope of the antenna emission, M (θ x ,θ y ) Representing the amplitude factor affected by the antenna arrangement. Lambda represents the wavelength of light, d x ，d y Represents the distance, theta, between antenna elements in the x and y directions x ,θ y The angular coordinates in the x, y directions are indicated. Δφ xm ,Δφ yn Respectively representing additional phase differences in both directions. Phi (phi) 0 Representing the initial phase difference of the phased array chip.
The matlab is utilized to simulate and obtain the periodic distribution result of the OPA light field, as shown in FIG. 7, FIG. 7 is a graph of the periodic distribution simulation result of the pseudo thermal light field output by the imaging OPA chip provided by the embodiment of the invention.
Referring to fig. 8, fig. 8 is a schematic diagram of movement of an object to be imaged in a periodic pseudo thermal light field, where the distribution of the pseudo thermal light output by an imaging OPA chip in space is of a periodic structure, and when the object to be imaged is in any period, the object to be imaged can be reconstructed by using the recorded total light intensity value (light intensity echo signal) measured by a detector as a reference light field in any period.
It should be noted that, the optical phased array imager of this embodiment can realize coverage in the whole field of view by using the arrangement mode of the beam emission units, and can realize measurement and prediction of the motion state and the position of the target by using the scanning OPA, and based on such a result, the position corresponding to a certain period in which the target is located and works in a specific beam emission unit is determined, and then the position of the echo signal of the detector element is screened based on this position, so as to accurately record the light energy reflected in this direction, and then imaging is performed by using the periodic characteristic of the distribution of the pseudo-thermal light in space. Because of the periodic characteristics of the pseudo-thermal light field, the target image can be reconstructed by calculating the light intensity of the signal acquired when the target is in any period through calculating the reference light field in any period, so that the data volume required by calculation is greatly reduced, and the imaging speed is improved.
Specifically, the electro-optical response Si OPA is adopted as a light beam emission unit, the scanning speed which can be realized is approximately 200MHz, the reconstruction speed of a single frame image is 200KHz, the imaging speed is extremely high, and the result of video output can be realized.
The optical phased array imager of the embodiment comprises a scanning OPA chip and an imaging OPA chip, wherein the scanning OPA chip is used for emitting scanning light beams to realize far-field scanning, the imaging OPA chip is used for emitting pseudo-thermal light to realize ghost imaging, the design of an antenna array in the scanning OPA chip and the imaging OPA chip is changed, the field of view corresponding to the OPA chip can be increased, high-resolution three-dimensional imaging is realized, and in addition, the optical phased array imager of the embodiment can capture objects moving rapidly, and realize rapid imaging of moving objects in the light field range.
Example two
In this embodiment, an experimental verification is performed on an imaging result of an optical phased array imager, please refer to fig. 10, fig. 10 is a graph of experimental simulation results of the imager provided by the embodiment of the present invention, where (a) the graph is a graph of experimental test light field, and (b) the graph is a simulation graph of image reconstruction of an object to be imaged according to the experimental test light field of the graph (a), specifically, (a) the graph is an example of one light field during experimental test, the whole graph represents light field distribution with three periods, when the object to be imaged is in the leftmost period, the simulation result of reconstruction of the object to be imaged through a ghost imaging formula is shown in the graph (b) by combining the reference light fields on the middle and the right side with the leftmost signal light field.
Referring to fig. 11, fig. 11 is an experimental result diagram of an imager according to an embodiment of the present invention, where (a) is an experimental result diagram obtained by experimental testing a light field according to the diagram (a) in fig. 10, (b) is a result diagram obtained by performing image enhancement on the diagram (a) through the results of a plurality of periodic light fields, and as shown in the drawing, the quality of an image can be effectively improved by superimposing reconstructed images, and (b) is an experimental result obtained by performing image enhancement on two periodic light fields in the diagram, and the enhancement effect with the increase of the number of periods is also enhanced.
It should be noted that in this document relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in an article or apparatus that comprises the element. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The orientation or positional relationship indicated by "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description and to simplify the description, and is not indicative or implying that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.

Claims (4)

1. An optical phased array imager, comprising:
the light beam emission module is used for emitting scanning light beams and pseudo-thermal light;
the echo detection module is used for acquiring a scanning echo signal and a light intensity echo signal of a target to be imaged;
the imaging module is used for imaging the target to be imaged through ghost imaging according to the scanning echo signal and the light intensity echo signal;
the light beam emission module comprises a plurality of light beam emission units for realizing 360-degree full-view field coverage, the light beam emission units comprise scanning OPA chips and imaging OPA chips, the scanning OPA chips are used for emitting scanning light beams for realizing far-field scanning, the imaging OPA chips are used for emitting pseudo-thermal light for realizing ghost imaging, and the distribution of the pseudo-thermal light in space is periodic;
the imaging module comprises a speed measuring unit and a calculation imaging unit, wherein the speed measuring unit is used for calculating a first moving speed component and a second moving speed component of the target to be imaged according to the scanning echo signals; the first moving speed component is a moving speed component of the object to be imaged in a plane perpendicular to the light propagation direction; the second moving speed component is a moving speed component of the object to be imaged in a direction parallel to the light propagation direction;
the calculation imaging unit is used for combining the first moving speed component and the second moving speed component to calculate a reference light field of the target to be imaged; obtaining a signal light field of the target to be imaged according to the light intensity echo signal; and imaging the object to be imaged by using ghost imaging according to the reference light field and the signal light field.
2. The optical phased array imager of claim 1, wherein a plurality of the beam emitting units are annularly distributed, and the annular center is provided with one of the beam emitting units.
3. The optical phased array imager of claim 1, wherein the echo detection module is an area array detector.
4. The optical phased array imager of claim 1, further comprising:
and the control module is used for controlling the scanning OPA chip to emit scanning light beams to realize far-field scanning when the imager is in an initial working state, and controlling the imaging OPA chip to emit pseudo-heat light to realize ghost imaging after the speed measurement is completed.
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CN209928071U (en) * 2019-04-12 2020-01-10 国科光芯(海宁)科技股份有限公司 Coupling device of optical phased array chip and waveguide chip
CN111580070A (en) * 2020-05-28 2020-08-25 香港中文大学（深圳） Optical phased array laser radar
CN112817009A (en) * 2020-12-30 2021-05-18 西安电子科技大学 Anti-interference detection imaging system and method based on two-dimensional optical phased array

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* Cited by examiner, † Cited by third party
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CN105388486A (en) * 2015-12-15 2016-03-09 西安电子科技大学 Ghost imaging system and imaging method based on fiber array pseudo-thermal light
CN209928071U (en) * 2019-04-12 2020-01-10 国科光芯(海宁)科技股份有限公司 Coupling device of optical phased array chip and waveguide chip
CN111580070A (en) * 2020-05-28 2020-08-25 香港中文大学（深圳） Optical phased array laser radar
CN112817009A (en) * 2020-12-30 2021-05-18 西安电子科技大学 Anti-interference detection imaging system and method based on two-dimensional optical phased array

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