CN113534099A - OPA scanning dynamic imaging method and imaging system - Google Patents
OPA scanning dynamic imaging method and imaging system Download PDFInfo
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- 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
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Abstract
The invention relates to an OPA scanning dynamic imaging method and an OPA scanning dynamic imaging system, wherein the method comprises the following steps: acquiring a target scanning echo signal, and acquiring a first moving speed component and a second moving speed component of a target according to the target scanning echo signal; combining the first moving speed component and the second moving speed component to calculate and obtain a reference light field of the target; acquiring a target light intensity echo signal, and acquiring a signal light field of a target according to the target light intensity echo signal; and realizing the imaging of the target by utilizing ghost imaging according to the reference light field and the signal light field. The OPA scanning dynamic imaging method can be used for measuring the moving speed of an object in a light field in a limited way and realizing super-resolution rapid imaging.
Description
Technical Field
The invention belongs to the field of LIDAR imaging, and particularly relates to an OPA scanning dynamic imaging method and an OPA scanning dynamic imaging system.
Background
Optical Phased Array (OPA) is a branch of LIDAR (laser radar) technology, and has attracted much attention in recent years due to its small size, weight, fast scanning speed, and easy integration. Since the advent of OPA, researchers have done a lot of outstanding work on the optimization of its design, mainly aiming at the structural design optimization of OPA, using different materials, optimizing the design structure, etc., scan imaging systems for OPA have been involved almost rarely.
In 2019, the method for realizing ghost imaging by using OPA is proposed in Japan, and the feasibility of the method is verified through experiments, so that an important step is formed in an OPA imaging application system, but the system is a simple system for principle verification, can only work in a laboratory, can only realize imaging on a static target, and cannot realize imaging on a dynamic target.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides an OPA scanning dynamic imaging method and an imaging system. The technical problem to be solved by the invention is realized by the following technical scheme:
the invention provides an OPA scanning dynamic imaging method, which comprises the following steps:
acquiring a target scanning echo signal, and acquiring a first moving speed component and a second moving speed component of a target according to the target scanning echo signal;
combining the first moving speed component and the second moving speed component to calculate a reference light field of the target;
acquiring a target light intensity echo signal, and acquiring a signal light field of the target according to the target light intensity echo signal;
and realizing the imaging of the target by utilizing ghost imaging according to the reference light field and the signal light field.
In an embodiment of the present invention, the target scanning echo signal is an echo signal obtained after a scanning beam passes through the target;
the target light intensity echo signal is a light intensity signal obtained after pseudo-thermal light passes through the target.
In one embodiment of the invention, the first moving velocity component is a moving velocity component of the target in a plane perpendicular to a light propagation direction;
the second moving velocity component is a moving velocity component of the object in a direction parallel to the light propagation direction.
In an embodiment of the present invention, acquiring a target scan echo signal, and obtaining a first moving velocity component of the target according to the target scan echo signal includes:
step 1: emitting a scanning light beam, and judging whether a target is detected or not according to an echo signal of the scanning light beam;
step 2: in response to the detection of the target, obtaining a target range judgment result through a target range judgment algorithm according to the received target scanning echo signal; wherein the target range determination result includes: a target range and a target center;
and step 3: adding time delay, taking the target center at the previous moment as a reference, scanning a light beam by adopting a variable step length method, repeating the steps 1-2 to obtain a target range judgment result at the moment, and determining the displacement of the target center according to the target range judgment results at two adjacent moments to obtain a target speed;
and 4, step 4: and (3) repeating the step until the target speed reaches a set threshold or the running times reaches a set threshold, and outputting the target speed to obtain a first moving speed component of the target.
In one embodiment of the present invention, the step 2 comprises:
in response to the detection of the target, increasing the scanning step length to scan again, analyzing an echo signal of the scanning beam, and judging whether the target is detected;
if the target is detected, continuing to increase the step length for scanning and judging whether the target is detected, if the target is not detected, decreasing the step length for re-scanning and judging whether the target is detected, and finishing the algorithm when the scanning step length is less than or equal to the width of the scanning beam;
and obtaining the target range according to the scanning step length, and obtaining the target center according to the target range.
In an embodiment of the present invention, acquiring a target scan echo signal, and obtaining a second moving speed component of the target according to the target scan echo signal includes:
and calculating a second moving speed component of the target by using a Doppler frequency shift algorithm according to the target scanning echo signal.
The invention provides an OPA scanning dynamic imaging system, comprising:
the OPA system is used for emitting scanning beams to realize far-field scanning and emitting pseudo-thermal light to realize ghost imaging;
the echo detection system is used for acquiring a target scanning echo signal and a target light intensity echo signal;
the speed measuring module is used for obtaining a first moving speed component and a second moving speed component of the target according to the target scanning echo signal;
the calculation imaging module is used for combining the first moving speed component and the second moving speed component to calculate and obtain a reference light field of the target; obtaining a signal light field of the target according to the target light intensity echo signal; and realizing the imaging of the target by utilizing ghost imaging according to the reference light field and the signal light field.
In one embodiment of the present invention, the OPA scanning dynamic imaging system further comprises:
and the control module is used for controlling the OPA emission optical system to emit scanning beams to realize far-field scanning in the initial working state of the system, and controlling the OPA emission optical system to emit pseudo-thermal light to realize ghost imaging after the speed measurement is finished.
Compared with the prior art, the invention has the beneficial effects that:
1. the OPA scanning dynamic imaging method of the invention decomposes the moving speed of the target into a moving speed component of the target in a plane vertical to the light propagation direction and a moving speed component of the target in a plane parallel to the light propagation direction, respectively measures the two speed components, and adjusts the space light field by utilizing the two speeds based on the mode of calculating the ghost imaging so as to realize the ghost imaging.
2. The OPA scanning dynamic imaging method can be used for measuring the moving speed of an object in a light field in a limited way and realizing super-resolution rapid imaging.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a flow chart of a method for OPA scanning dynamic imaging according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a calculation process of a first moving velocity component according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a target range determination algorithm provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a calculation flow of a second moving velocity component according to an embodiment of the present invention;
FIG. 5 is a block diagram of an OPA scanning dynamic imaging system according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an OPA scanning dynamic imaging system provided by an embodiment of the present invention;
FIG. 7 is a flowchart of the operation of an OPA scanning dynamic imaging system provided by an embodiment of the present invention;
FIG. 8 is a graph of imaging results of the method of the present invention;
fig. 9 is a graph of an imaging result of a general optical system.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, an OPA scanning dynamic imaging method and an imaging system according to the present invention are described in detail below with reference to the accompanying drawings and the detailed description.
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings. The technical means and effects of the present invention adopted to achieve the predetermined 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 used for limiting the technical scheme of the present invention.
Example one
Referring to fig. 1 in combination, fig. 1 is a flowchart of an OPA scanning dynamic imaging method according to an embodiment of the present invention, where as shown in the figure, the OPA scanning dynamic imaging method according to the embodiment includes:
acquiring a target scanning echo signal, and acquiring a first moving speed component and a second moving speed component of a target according to the target scanning echo signal;
combining the first moving speed component and the second moving speed component to calculate and obtain a reference light field of the target;
acquiring a target light intensity echo signal, and acquiring a signal light field of a target according to the target light intensity echo signal;
and realizing the imaging of the target by utilizing ghost imaging according to the reference light field and the signal light field.
In the OPA scanning dynamic imaging method of this embodiment, the moving speed of the target is decomposed into a moving speed component of the target in a plane perpendicular to the light propagation direction and a moving speed component of the target in a plane parallel to the light propagation direction, and the two speed components are obtained by measurement respectively.
In this embodiment, the target scan echo signal is an echo signal obtained after the scan beam passes through the target; the target light intensity echo signal is a light intensity signal obtained after pseudo-thermal light passes through a target.
In the present embodiment, the first moving velocity component is a moving velocity component of the object in a plane perpendicular to the light propagation direction; the second moving velocity component is a moving velocity component of the object in parallel to the light propagation direction.
Referring to fig. 2 in combination, fig. 2 is a schematic diagram of a calculation flow of a first moving speed component according to an embodiment of the present invention, as shown in the figure, specifically, acquiring a target scan echo signal, and obtaining the first moving speed component of the target according to the target scan echo signal includes:
step 1: emitting a scanning light beam, and judging whether a target is detected or not according to an echo signal of the scanning light beam;
step 2: in response to the detection of the target, scanning an echo signal according to the received target, and obtaining a target range judgment result through a target range judgment algorithm; wherein the target range determination result includes: a target range and a target center;
and step 3: adding time delay, taking the target center at the previous moment as a reference, scanning a light beam by adopting a variable step length method, repeating the step 1-the step 2 to obtain a target range judgment result at the moment, and determining the displacement of the target center according to the target range judgment results at two adjacent moments to obtain a target speed;
and 4, step 4: and (3) repeating the step (3) until the target speed reaches a set threshold or the running times reaches the set threshold, and outputting the target speed to obtain a first moving speed component of the target.
In this embodiment, when the ratio of the mean square error between the target velocity calculated at the present time and all the calculated target velocities is smaller than a set threshold, the target velocity is output as the first moving velocity component of the target, or when the number of operations of the algorithm is greater than or equal to a set maximum number of operations, the operation is stopped, the last calculated target velocity is output as the first moving velocity component of the target,
it should be noted that, in this embodiment, after adding the time delay, the target center at the above time is taken as a reference, and the light beam scanning is performed by using the variable step method, so that the scanning time can be reduced, and the target can be detected more quickly and effectively.
Further, referring to fig. 3, fig. 3 is a schematic flowchart of a target range determination algorithm provided in the embodiment of the present invention, and as shown in the figure, step 2 specifically includes:
in response to the detection of the target, increasing the scanning step length to scan again, analyzing the echo signal of the scanning beam, and judging whether the target is detected;
if the target is detected, continuing to increase the step length for scanning and judging whether the target is detected, if the target is not detected, reducing the step length for re-scanning and judging whether the target is detected, and finishing the algorithm when the scanning step length is less than or equal to the width of the scanning beam;
and obtaining a target range according to the scanning step length, and obtaining a target center according to the target range.
Specifically, explanation is made for the scanning step: the scanned light field of the OPA is an angular range, for a 2-dimensional OPA, the light field range is assumed to be 50 ° x 50 °, while the spatial resolution of the OPA is 0.5 ° x 0.5 °. Then, the light field can be divided into a 100 × 100 matrix. OPA is a device without inertial scanning, so that for a scanning step it can be understood the difference in the values of the X, Y coordinates of two adjacent scanning points. Therefore, by the method of the embodiment, the target range can be obtained according to the scanning step length, so that the target center can be obtained according to the target range.
In the implementation, the target range is rapidly judged by adopting a self-adaptive variable-step algorithm, the whole range of the target is not required to be completely scanned by the algorithm, the range of the target can be measured only by scanning limited dozens of or even a few points, and the time for measuring the size of the target is greatly reduced.
Further, referring to fig. 4, fig. 4 is a schematic diagram of a calculation flow of the second moving speed component according to an embodiment of the present invention, as shown in the figure, specifically, acquiring the target scan echo signal, and obtaining the second moving speed component of the target according to the target scan echo signal includes: and calculating a second moving speed component of the target by utilizing a Doppler frequency shift algorithm according to the scanning echo signal of the target.
The doppler shift algorithm obtains the difference between the frequencies of the target scanning echo signals at two moments (i.e. doppler shift) by measurement and calculation, and obtains the second moving velocity component of the target according to the magnitude of the doppler shift obtained by measurement and calculation because the doppler shift is proportional to the moving velocity component of the target in the direction parallel to the light propagation direction, i.e. the second moving velocity component. The specific calculation steps of the doppler shift algorithm are consistent with those of the doppler shift velocity measurement algorithm of the existing doppler velocity measurement system, and are not described herein again.
Furthermore, after the moving speed of the target is extracted, a speed component needs to be added when the reference light field is calculated, and the speed component accords with the moving speed of the target, so that the reference light field participating in imaging calculation is ensured to be a light field which just irradiates on the target at the moment, the reference light field participating in the calculation needs to be dynamically adjusted in real time, and then the target is imaged by combining a dynamic ghost imaging algorithm.
Due to the adoption of the algorithm for calculating the ghost imaging, the light field distribution (namely the reference light field) corresponding to the space where the target is located can be calculated in advance in a calculation mode. Firstly, according to the two obtained components of the target moving speed, the spatial light field distribution is calculated by combining the two components of the target moving speed, a reference light field of the target is obtained, then a signal light field (signal light intensity) of the target is obtained by calculation according to a target light intensity echo signal, and finally, imaging is carried out by utilizing a ghost imaging algorithm according to the reference light field and the signal light intensity.
In particular, the advent of entangled two-photon imaging designed by Pittman et al in 1995 marks the formal birth of ghost imaging technology, as to the principle of ghost imaging. The specific operation is that continuous laser is pumped to a BBO crystal, a parametric down-conversion process is generated, and a pair of orthogonally polarized photons is generated: signal photons (extraordinary rays of the crystal) and reference photons (ordinary rays of the crystal). Then, the prism is used for separating the pump light and the entangled photon pair, the entangled photon pair is divided into two beams through a beam splitter sensitive to polarization, the signal light is reflected by the beam splitter and then passes through a transmission type object to be detected, and then the signal light is collected into a barrel detector through a lens; the reference light is transmitted through the beam splitter and is collected by a "point" detector that scans in the X-Y plane. And finally, performing 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 carry out one-to-one direct measurement on the transmission function of the object to be measured in space like the traditional imaging, but carries out indirect measurement by utilizing the association between light beams, and then recovers the image by calculation; in addition, the signal optical path and the reference optical path of the ghost image are separated.
Thus, it can be seen that the ghost imaging technique 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 through rotating ground glass, the random scattering light field is divided into two beams by a beam splitter, one beam of light is focused by a condensing lens after passing through an object to be detected as signal light, and finally the total intensity of the beam of light is measured by a barrel detector without resolution; after the other beam of light is freely propagated for a certain distance, the light field distribution of the other beam of light is detected by a CCD camera with resolution. The light intensity measured by the two detectors is subjected to correlation operation, so that the image of the object to be measured can be obtained, and the second-order correlation function of the light field can be calculated.
Regarding the principle of computational imaging: the computed ghost imaging is classical light field ghost imaging, a known associated light field is generated by utilizing a computed holographic technology, an idle light path for detecting light field distribution is omitted, the optical system is simpler in structure, higher in external interference resistance, more efficient in image reconstruction and better in imaging effect, the computed ghost imaging inherits the important characteristics of the ghost imaging in the aspect of the imaging principle, and the computed ghost imaging has more important practical application value in research of the computed ghost imaging and pseudo-heat source ghost imaging compared with two photons. In the embodiment, an OPA system is adopted as the pseudo-thermal light source, and the OPA system can generate a specific output optical field distribution under a specific driving voltage, and is a pseudo-thermal light source which is very suitable for calculating a ghost image.
In this embodiment, for ghost imaging and computational imaging, a specific algorithm is a conventional algorithm, and a specific calculation process is not described herein again.
The OPA scanning dynamic imaging method can be used for measuring the moving speed of an object in a light field in a limited way and realizing super-resolution rapid imaging.
Example two
The embodiment provides an OPA scanning dynamic imaging system, which is suitable for the OPA scanning dynamic imaging method of the first embodiment. Referring to fig. 5, fig. 5 is a block diagram of an OPA scanning dynamic imaging system according to an embodiment of the present invention, and as shown in the drawing, the OPA scanning dynamic imaging system according to the embodiment includes:
the OPA system is used for emitting scanning beams to realize far-field scanning and emitting pseudo-thermal light to realize ghost imaging;
the echo detection system is used for acquiring a target scanning echo signal and a target light intensity echo signal;
the speed measuring module is used for obtaining a first moving speed component and a second moving speed component of the target according to the target scanning echo signal;
the calculation imaging module is used for combining the first moving speed component and the second moving speed component to calculate and obtain a reference light field of the target; obtaining a signal light field of a target according to the target light intensity echo signal; and realizing the imaging of the target by utilizing ghost imaging according to the reference light field and the signal light field.
In this embodiment, the target scan echo signal is an echo signal obtained after the scan beam passes through the target; the target light intensity echo signal is a light intensity signal obtained after pseudo-thermal light passes through a target.
In the present embodiment, the first moving velocity component is a moving velocity component of the object in a plane perpendicular to the light propagation direction; the second moving velocity component is a moving velocity component of the object in parallel to the light propagation direction.
Further, the OPA scanning dynamic imaging system further comprises:
and the control module is used for controlling the OPA emission optical system to emit scanning beams to realize far-field scanning in the initial working state of the system, and controlling the OPA emission optical system to emit pseudo-thermal light to realize ghost imaging after the speed measurement is finished.
In the present embodiment, the OPA system includes a two-dimensional OPA emission unit and an OPA emission optical system, wherein the two-dimensional OPA emission unit is made of, but not limited to, a silicon material, a GaAs-AlGaAs material; the OPA emission optical system may be, but is not limited to, an objective lens, a lens composition.
Alternatively, the echo detection system may be, but is not limited to, a bucket detector, an area array detector. The same chip is optionally used to perform speed measurement and computational imaging.
Optionally, the control module may adopt an external control circuit, and is configured to control the OPA emission optical system to emit the scanning beam in an initial operating state of the system, and control the OPA emission optical system to emit the pseudo-thermal light after the speed measurement is completed. The specific circuit configuration is not limited herein.
Further, a specific working process and principle of the OPA scanning dynamic imaging system of the embodiment are explained, please refer to fig. 6 and fig. 7 in combination, fig. 6 is a schematic working diagram of the OPA scanning dynamic imaging system according to the embodiment of the present invention (in which the speed measurement module, the calculation imaging module, and the control module are not shown); fig. 7 is a flowchart of the operation of the OPA scanning dynamic imaging system according to the embodiment of the present invention. As shown in the figure, the OPA scanning dynamic imaging system of the present embodiment is divided into two working states, wherein: the initial operating state of the system is a speed measurement operating state in which the external control circuit applies sequential voltages to the OPA, at which time the OPA is able to effect sequential scans of the field of view. When the object moves into the field of view, the object is scanned by the light emitted by the OPA, and the result is reflected by the measuring signal of the detector. The system calculates the moving speed of the target by the speed measurement algorithm to obtain two components of the moving speed of the target, then respectively feeds the two components of the speed back to an upper computer, at the moment, an external control circuit loads a random voltage to an OPA, calculates the spatial light field distribution by the imaging algorithm, and then performs ghost imaging image recovery on the target by combining the light intensity measurement result of the detector to obtain a final image result, thereby realizing the rapid imaging of the target.
The OPA scanning dynamic imaging system provided by the embodiment of the present invention may implement the above method embodiments, and specific implementation steps, principles, and technical effects thereof are similar, and are not described herein again.
EXAMPLE III
In this embodiment, experimental verification is performed on the OPA scanning dynamic imaging method of the first embodiment, please refer to fig. 8 and 9, and fig. 8 is a graph of an imaging result of the method of the present invention; fig. 9 is a graph of an imaging result of a general optical system. As shown in the figure, in which the imaging target is an object with an outer size of 5mm of 30m, it can be seen that the OPA scanning dynamic imaging method of the present embodiment can realize the imaging of the object with the size of 5mm at a distance of 30m, and it is important that the iterative algorithm adopted by us runs 1000 times but reconstructs the target image with 444 × 512 pixels, which is a result far higher than nyquist sampling law. As can be seen from the comparison graph in fig. 9, the imaging result graph of the ordinary optical system has a lower resolution.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or device 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 an … …" does not exclude the presence of additional like elements in the article or device comprising the element. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The directional or positional relationships indicated by "upper", "lower", "left", "right", etc., are based on the directional or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. An OPA scanning dynamic imaging method, comprising:
acquiring a target scanning echo signal, and acquiring a first moving speed component and a second moving speed component of a target according to the target scanning echo signal;
combining the first moving speed component and the second moving speed component to calculate a reference light field of the target;
acquiring a target light intensity echo signal, and acquiring a signal light field of the target according to the target light intensity echo signal;
and realizing the imaging of the target by utilizing ghost imaging according to the reference light field and the signal light field.
2. The OPA scanning dynamic imaging method of claim 1,
the target scanning echo signal is an echo signal obtained after a scanning beam passes through the target;
the target light intensity echo signal is a light intensity signal obtained after pseudo-thermal light passes through the target.
3. The OPA scanning dynamic imaging method of claim 1,
the first moving velocity component is a moving velocity component of the target in a plane perpendicular to a light propagation direction;
the second moving velocity component is a moving velocity component of the object in a direction parallel to the light propagation direction.
4. The OPA scanning dynamic imaging method according to claim 1, wherein obtaining a target scan echo signal, and obtaining a first moving velocity component of the target according to the target scan echo signal, comprises:
step 1: emitting a scanning light beam, and judging whether a target is detected or not according to an echo signal of the scanning light beam;
step 2: in response to the detection of the target, obtaining a target range judgment result through a target range judgment algorithm according to the received target scanning echo signal; wherein the target range determination result includes: a target range and a target center;
and step 3: adding time delay, taking the target center at the previous moment as a reference, scanning a light beam by adopting a variable step length method, repeating the steps 1-2 to obtain a target range judgment result at the moment, and determining the displacement of the target center according to the target range judgment results at two adjacent moments to obtain a target speed;
and 4, step 4: and (3) repeating the step until the target speed reaches a set threshold or the running times reaches a set threshold, and outputting the target speed to obtain a first moving speed component of the target.
5. The OPA scanning dynamic imaging method according to claim 4, wherein the step 2 comprises:
in response to the detection of the target, increasing the scanning step length to scan again, analyzing an echo signal of the scanning beam, and judging whether the target is detected;
if the target is detected, continuing to increase the step length for scanning and judging whether the target is detected, if the target is not detected, decreasing the step length for re-scanning and judging whether the target is detected, and finishing the algorithm when the scanning step length is less than or equal to the width of the scanning beam;
and obtaining the target range according to the scanning step length, and obtaining the target center according to the target range.
6. The OPA scanning dynamic imaging method according to claim 1, wherein obtaining a target scan echo signal, and obtaining a second moving velocity component of the target according to the target scan echo signal, comprises:
and calculating a second moving speed component of the target by using a Doppler frequency shift algorithm according to the target scanning echo signal.
7. An OPA scanning dynamic imaging system, comprising:
the OPA system is used for emitting scanning beams to realize far-field scanning and emitting pseudo-thermal light to realize ghost imaging;
the echo detection system is used for acquiring a target scanning echo signal and a target light intensity echo signal;
the speed measuring module is used for obtaining a first moving speed component and a second moving speed component of the target according to the target scanning echo signal;
the calculation imaging module is used for combining the first moving speed component and the second moving speed component to calculate and obtain a reference light field of the target; obtaining a signal light field of the target according to the target light intensity echo signal; and realizing the imaging of the target by utilizing ghost imaging according to the reference light field and the signal light field.
8. The OPA scanning dynamic imaging system of claim 7, further comprising:
and the control module is used for controlling the OPA emission optical system to emit scanning beams to realize far-field scanning in the initial working state of the system, and controlling the OPA emission optical system to emit pseudo-thermal light to realize ghost imaging after the speed measurement is finished.
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| Application Number | Priority Date | Filing Date | Title |
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