CN114966739A - Target detection imaging system and method based on fiber laser phased array - Google Patents
Target detection imaging system and method based on fiber laser phased array Download PDFInfo
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Abstract
The invention provides a target detection imaging system and method based on an optical fiber laser phased array, which comprises an optical fiber laser phased array light source, an optical fiber laser array and a target imaging system, wherein the optical fiber laser phased array light source is used for generating array optical fiber lasers with intensity distribution capable of changing at a high speed; the light splitting unit splits the array fiber laser into emission light and reference light; an emission optical system projects the emission light to a target surface; collecting the intensity distribution of the reference light by a reference optical system; the receiving optical system receives the return light reflected by the target and collects the intensity distribution of the return light; the calculation control system performs phase control on each path of fiber laser in the array fiber laser to enable the intensity distribution to change at a high speed, and simultaneously reconstructs a target image based on the intensity distribution of the reference light and the intensity distribution of the return light. The invention has the characteristics of high transmitting power, high refreshing rate, capability of conveniently controlling the field of view of the illumination light field and the like, and can obviously improve the target detection distance and the associated imaging speed.
Description
Technical Field
The invention relates to the technical field of optical detection imaging, in particular to a target detection imaging system based on an optical fiber laser phased array.
Background
The correlation imaging is a novel active imaging technology for imaging an object based on light field high-order correlation (intensity correlation), the basic principle is that a light field with intensity fluctuation is divided into two beams, one beam is recorded by a camera after free propagation and is used for obtaining the intensity distribution of the light field and is called reference arm light, the other beam is called object arm light, scattered light or transmitted light irradiated on the object is collected by a point detector without space resolution capacity, the object arm light and the reference arm light are subjected to multiple coincidence measurement according to the same time sequence signal, and then two-dimensional or three-dimensional image reconstruction of the object is performed based on a correlation algorithm. Correlated imaging is a non-localized imaging modality, also commonly referred to as "ghost" imaging.
Compared with traditional imaging, correlation imaging has many advantages due to its special imaging mechanism. Firstly, the correlated imaging adopts a point detector to collect return light, compared with an array detector, the sensitivity of the point detector is higher, imaging under the condition of weak light can be realized, and in addition, the cost of the point detector is lower than that of a common area array detector in non-visible light wave bands such as infrared light, X-ray and the like; secondly, multiple sampling is needed for correlated imaging, and image reconstruction is carried out in a statistical averaging mode, so that noise irrelevant to light source statistics can be suppressed; and finally, the associated imaging is based on algorithm reconstruction images, and image optimization can be performed by combining advanced algorithms such as compressed sensing and deep learning, so that the imaging quality is improved.
Due to the characteristics of strong anti-noise performance, high detector sensitivity and the like, the correlated imaging has important application potential in the field of remote target detection. When a target is remotely detected and imaged in an atmospheric environment, three main research directions are to increase the detection distance, improve the imaging speed and improve the imaging quality. The anti-noise characteristic of the correlated imaging can effectively overcome the influence of atmospheric turbulence on the imaging quality, and the high-sensitivity characteristic is favorable for imaging under the weak light condition, so that the detection distance can be effectively increased.
However, in specific applications, the related imaging technology also faces some technical problems. Currently, the method for obtaining the intensity fluctuation light field by the correlation imaging system usually comprises laser and rotating ground glass, a spatial light modulator or a digital micro-mirror array. The rotating ground glass can obtain a variable speckle field by scattering laser at different positions of the ground glass, and the variation frequency depends on the rotating speed of a rotating motor, so that the modulation frequency of the variable speckle field is lower; the spatial light modulator can obtain an optical field with controllable intensity distribution through amplitude and phase modulation, but the modulation rate is also low (usually tens of Hz); the digital micromirror array obtains the light field with controllable intensity distribution by binary amplitude modulation, and the highest modulation rate is only dozens of kHz. In order to further improve the modulation frequency, the LED array is also widely used in the related imaging technology in recent years to generate a rapidly changing intensity fluctuating light field, the highest modulation rate of which can reach the MHz level, but the LED array is limited by the problem of heat dissipation, the emission power of which is low, and the LED array cannot be applied to the field of remote target detection at present.
In summary, in order to further expand the application of the correlation imaging technology in the field of remote target detection, developing a light source with high emission power and high modulation rate becomes an important research direction for the development of the technical field.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a target detection imaging system and method based on a fiber laser phased array.
In order to achieve the technical purpose, the technical scheme provided by the invention is as follows:
in one aspect, the present invention provides a target detection imaging system based on fiber laser phased array, including:
the system comprises an optical fiber laser phased array light source, a phase control unit and a phase control unit, wherein the optical fiber laser phased array light source is used for generating an interference speckle field with intensity distribution capable of changing at a high speed, and the interference speckle field is composed of multi-path phase-controllable optical fiber lasers;
a light splitting unit that splits the interference speckle field into emission light and reference light;
an emission optical unit projecting emission light to a target surface;
a reference optical unit collecting intensity distribution of reference light;
a receiving optical unit that receives return light reflected from the target and records the intensity distribution of the return light;
and the calculation control unit is used for carrying out phase control on each path of fiber laser in the array fiber laser to enable the intensity distribution to change at a high speed, and reconstructing a target image based on the intensity distribution of the reference light and the intensity distribution of the return light.
On the other hand, by using the target detection imaging system based on the fiber laser phased array, the invention provides a target detection imaging method based on the fiber laser phased array, which specifically comprises the following steps:
the optical fiber laser phased array light source comprises a calculation control unit, a fiber laser phased array light source, a fiber laser optical fiber array light source and a control unit, wherein the fiber laser phased array light source is used for generating a speckle field by interference of branch fiber light sources;
the interference speckle field is split by the light splitting unit, one path of the interference speckle field is used as reference light and enters the reference optical unit to record the spatial intensity distribution of the interference speckle field, and the other path of the interference speckle field is used as reflected light and enters the transmitting unit to project the interference speckle field onto a target object;
the return light generated by the target object is received by the receiving optical unit and the recorded return light intensity distribution is transmitted to the calculation control unit;
the calculation control unit runs a reconstruction algorithm to reconstruct an image of the target object based on the spatial intensity distribution of the interference speckle field recorded by the reference optical unit and the return light intensity distribution recorded by the receiving optical unit. The reconstruction algorithm may be an intensity correlation algorithm, a differential correlation algorithm, or a normalized correlation algorithm.
Compared with the prior art, the invention has the advantages that:
1. compared with the existing correlation imaging system based on rotating ground glass, a spatial light phase modulator and a digital micromirror array, the imaging system provided by the invention has the characteristics of high transmitting power and high modulation frequency, can be applied to remote target detection and realizes the rapid imaging of a remote target;
2. the fiber laser phased array can adopt a high-bandwidth phase modulator to realize the phase modulation frequency of MHz or even GHz and realize the rapid change of the form of an interference light field, and meanwhile, the laser power is amplified by a fiber amplifier in each path of fiber link, so that the high transmitting power output above hundred watt can be realized, and the detection distance is increased;
3. the interference light field of the fiber laser phased array can realize convenient conversion of a view field through phase control, can realize tracking of a moving target, can set an optimal speckle form through return light feedback, and realizes high-quality imaging.
In conclusion, the active correlation imaging system based on the fiber laser phased array has great application value in the field of remote target detection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is an architectural diagram of one embodiment of the present invention;
FIG. 2 is a diagram of an optical path structure according to an embodiment of the present invention;
FIG. 3 is a flow chart of an embodiment of the present invention.
Detailed Description
For the purpose of promoting a clear understanding of the objects, aspects and advantages of the embodiments of the invention, reference will now be made to the drawings and detailed description, wherein there are shown in the drawings and described below specific embodiments of the invention, in which modifications and variations can be made by one skilled in the art without departing from the spirit and scope of the invention. The exemplary embodiments of the present invention and the description thereof are provided to explain the present invention and not to limit the present invention.
In an embodiment, referring to fig. 1, there is provided an object detection imaging system based on a fiber laser phased array, including:
the optical fiber laser phased array light source 100 is used for generating an interference speckle field with intensity distribution capable of changing at a high speed, and the interference speckle field is composed of multi-path phase-controllable optical fiber lasers; (ii) a
A light splitting unit 200 that splits the interference speckle field into emission light and reference light;
an emission optical unit 300 projecting emission light to a target surface;
a reference optical unit 400 collecting intensity distribution of reference light;
a receiving optical unit 500 that receives return light reflected from a target and records the intensity distribution of the return light;
and a calculation control unit 600 configured to perform phase control on each optical fiber laser in the array optical fiber laser to change the intensity distribution at a high speed, and reconstruct a target image based on the intensity distribution of the reference light and the intensity distribution of the returned light.
Compared with the existing correlation imaging system based on the rotating ground glass and the space optical phase modulator, the correlation imaging system has the characteristics of high transmitting power, high modulation frequency and the like, and can remarkably improve the detection distance and the imaging speed of correlation imaging; meanwhile, the method has the potential of single-arm calculation correlation imaging.
Referring to fig. 2, an embodiment provides an object detection imaging system based on a fiber laser phased array, including a fiber laser phased array light source, a light splitting unit, a transmitting optical unit, a reference optical unit, a receiving optical unit, and a calculation control unit.
The fiber laser phased array light source comprises a single-frequency fiber laser seed source 1, a fiber laser preamplifier 2, a beam splitter 3, a phase modulator array 5, a fiber amplifier array 6, a fiber collimating mirror array 7 and a beam expander array 8, the single-frequency fiber laser seed source 1 is firstly injected into a fiber laser preamplifier 2 for power amplification, the amplified fiber laser is split by a beam splitter 3, each split fiber laser corresponds to one phase modulator in a phase modulator array 5, each phase modulator controls the phase change of the single fiber laser, each phase-modulated fiber laser is subjected to power re-amplification by a corresponding fiber amplifier in a fiber amplifier array 6, each amplified fiber laser is output in a collimation manner by a corresponding collimating mirror in a fiber collimating mirror array 7, and the amplified fiber laser is expanded by a corresponding beam expanding mirror in a beam expanding mirror array 8 to reduce the divergence angle. The single-frequency fiber laser seed source 1 can adopt a near-infrared fiber laser seed source, and the fiber amplifier array 6 adopts a near-infrared fiber amplifier array.
The light splitting unit comprises a condensing lens 9, a field lens 10, a first reflecting mirror 11 and a light splitting mirror 12, wherein the condensing lens 9 condenses and interferes multi-channel fiber laser output by the fiber laser phased array light source to form an interference speckle field, the field lens 10 images a laser beam waist on the first reflecting mirror 11 and reflects the laser beam waist to the light splitting mirror 12 through the first reflecting mirror 11, the light splitting mirror 12 divides the incident interference speckle field into transmission light and reflection light, the transmittance of the transmission light is about 1%, the transmission light is used as reference light and enters the reference optical unit, and the reflection light is used as emission light and enters the emission optical unit.
The reference optical unit comprises a second reflector 13, a reference lens 14, an attenuation sheet 15 and a CCD camera 16 which are sequentially arranged, the reference light is reflected to the reference lens 14 through the second reflector 13, the reference lens 14 is used for imaging the reference light to the CCD camera 16, and the attenuation sheet is used for adjusting the intensity of a light field entering the CCD camera 16 and protecting the light sensing surface of the CCD camera 16. The CCD camera 16 collects the intensity distribution of the reference light.
The emission optical unit includes an emission lens 17, the emission light is projected onto a target object 18 through the emission lens 17, and the reflected light of the target object 18 is received by the reception optical unit.
The receiving optical unit receives the return light reflected from the target object 18 and records the return light intensity distribution. The receiving optical unit is sequentially provided with a receiving lens 19, a third reflector 20, a collimating lens 21, an optical filter 22, a first imaging lens 23, a diaphragm 24, a second imaging lens 25 and a single-pixel detector 26 along the optical path direction. The receiving lens 19 receives the return light reflected from the target object 18, and the return light is imaged on the single-pixel detector 26 after passing through the third reflector 20, the collimating lens 21, the optical filter 22, the first imaging lens 23, the diaphragm 24 and the second imaging lens 25, so that the collection of the intensity distribution of the return light reflected by the target is realized. The optical filter 22 is used for eliminating the influence of stray light, and the diaphragm 24 is used for adjusting the size of a field of view and the size of a signal, so that the signal to noise ratio is improved. The first imaging lens 23 and the second imaging lens 25 image the entrance pupil of the receiving lens group onto the single-pixel detector to realize signal acquisition.
The calculation control unit comprises a computer 28, a phase control unit 4 and a data acquisition unit 27, wherein the computer 28 is combined with the phase control unit 4 and used for applying phase modulation signals to each phase modulator in a phase modulator array 5 in the fiber laser phased array light source, and the computer 28 is combined with the data acquisition unit 27 and used for collecting intensity distributions of return light intensity signals and reference light, converting the intensity distributions into electric signals and digital signals, performing data analysis and reconstructing images of the target object.
In the fiber laser phased array light source according to an embodiment, 1064nm single-frequency laser generated by a single-frequency fiber laser seed source 1 is power-amplified by a fiber preamplifier 2 to obtain sufficient seed power, and then enters each branch fiber by a fiber beam splitter 3. The computer 28 applies a set voltage signal to each phase modulator in the phase modulator array 5 in conjunction with the phase control unit 4, thereby performing phase control on each branched fiber laser. LiNbO is adopted as the phase modulator in the phase modulator array 5 3 The modulation bandwidth of the electro-optical phase modulator can reach MHz magnitude and even GHz magnitude. Each path of the fiber laser after phase modulation is subjected to power re-amplification through a corresponding path of the fiber amplifier in the fiber amplifier array 6. Specifically, the optical fiber amplifier may adopt an ytterbium-doped optical fiber amplifier, and the optical fiber amplifier performs corresponding power amplification according to the requirement of the detection distance. The amplified light field is output through collimation of the collimating lens array 7, the beam expanding lens array 8 is used for increasing the size of a light spot and reducing a divergence angle, and the expanded light field generates an interference speckle field on a focal plane through the focusing lens 8. The light beam output by the collimating mirror can be regarded as Gaussian beam, and each path of fiber laser output by the fiber laser phased array light source output end can be regarded asExpressed as:
wherein a is n And (x) n ,y n ) The amplitude and the central coordinate, w, of the n-th fiber laser in the output plane (x-y plane), respectively 0 Is the beam waist, phi n,p Indicating the phase of the p-th modulation period, phi, applied by the phase modulator to the n-th fiber laser in The initial phase of the nth fiber laser changes to be time-varying at low speed, and can be regarded as a constant when the modulation rate is high.
When the observation area is positioned in a far field and meets Fraunhofer diffraction conditions, according to the Fraunhofer approximation theory, the light field intensity distribution in an observation plane (xi-eta plane) is Fourier transform of the light field intensity distribution on an x-y plane. On the ξ - η plane, the speckle field in the pth modulation period can be expressed as:
where k is the space wavenumber and D is the observation distance, the intensity distribution of the pth speckle field can be expressed as:
wherein I EN(ξ，η) As the envelope of the intensity of the light field, I (ξ，η，p) The rest of the array is closely related to the array arrangement of the fiber lasers and the applied phase of each fiber laser.
In the emission optical unit, a field lens 10 is located at the focal plane position of a focusing lens 9 and is used for imaging an interference speckle field at the focal plane onto an emission lens 17, a reflecting mirror 11 is used for changing the direction of a light path and reducing the size of an optical system, a spectroscope 12 is inserted to split the intensity distribution information of the speckle field before the interference speckle field enters the emission lens 17, the splitting ratio is 99:1, reflected light which accounts for main energy components enters the emission optical unit to illuminate a long-distance target object, and transmitted light enters a reference optical unit.
In the reference optical unit, the reference lens 14 images the interference speckle field into the CCD camera 16, the magnification of the reference lens 14 should be designed according to the speckle size and the CCD camera pixel size, and the attenuation sheet 15 is introduced into the imaging optical path of the reference lens 14 to adjust the intensity of the interference speckle field light field entering the CCD camera 16 for protecting the photosensitive surface of the CCD camera.
The interference speckle field is imaged by a mirror 17 in the transmitting optical unit onto a target object 18, which target object 18 reflects back light into the receiving optical unit via a receiving lens 19. In the receiving optical unit, the reflector 20 is used for adjusting the direction of an optical path, return light is collimated by the collimating lens 21 and then passes through the filter 22 to filter stray light outside 1064nm, the collimating lens 21 is used for reducing the angle of the return light entering the filter 22, the filtering effect is enhanced, and the imaging signal-to-noise ratio is improved, the filtered return light is subjected to an imaging lens group formed by the first imaging lens 23 and the second imaging lens 25 and then is recorded by the single-pixel photoelectric detector 26, the field diaphragm 24 is inserted between the first imaging lens 23 and the second imaging lens 25 and used for adjusting the signal size and the field size of the receiving system, stray strong light spots in a return light field can be shielded, and the imaging quality is improved. The single pixel detector 26 may be a photomultiplier tube or an avalanche photodiode.
The computer 28 and the data acquisition unit 27 acquire the spatial intensity distribution of the interference speckle field recorded by the reference optical unit and the return light intensity distribution reflected back by the target object recorded by the receiving optical unit, and reconstruct an image of the target object 18 therefrom.
An embodiment of the present invention provides an imaging method based on the imaging system, and with reference to fig. 3, the specific process includes:
(S1) each branch optical fiber light source of the optical fiber laser phased array light sourceInterference in the far field to form a speckle field I (ξ，η，p) The spatial distribution of the interference speckle field is refreshed by implementing phase control by the calculation control unit;
(S2) the interference speckle field is split by the splitting unit, and one path of light enters the reference optical unit as reference light to record the spatial intensity distribution I of the interference speckle field (ξ，η，p) One path of the reflected light enters the transmitting unit as reflected light to project an interference speckle field onto a target object;
(S3) the return light t (p) generated by the target object is collected by the receiving optical unit and converted into an electrical signal by the single-pixel photodetector to be transmitted to the calculation control unit;
(S4) the calculation control unit constructs a reconstruction algorithm for performing image reconstruction of the target object based on the spatial intensity distribution of the interference speckle field recorded by the reference optical unit and the return light intensity distribution recorded by the reception optical unit.
In the step (S3) of this embodiment, the return light t (p) generated by the target object is the interference speckle field I (ξ，η，p) And the inner product of the target object reflectivity function W (xi, eta) satisfies the following formula:
wherein N and M are the pixel numbers of the xi direction and the eta direction of the far field observation plane respectively.
In the step (S4) of this embodiment, the target object is reconstructed by using the intensity correlation algorithm, and K sampling is performed in total, and the reconstructed object image satisfies:
wherein
The average value of the return light intensity distribution collected by the single-pixel photoelectric detector when the interference speckle fields with different intensity distributions are used for sampling for K times.
The laser phased array-based correlated imaging optical system has the characteristics of high emission power and high modulation frequency, can realize the effect of fast correlated imaging of a remote target, has the potential of single-arm calculation correlated imaging through precise phase control, and provides a novel reliable technical approach for realizing detection imaging of the remote target.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An object detection imaging system based on fiber laser phased array, comprising:
the system comprises a fiber laser phased array light source, a phase detector and a controller, wherein the fiber laser phased array light source is used for generating an interference speckle field with intensity distribution capable of changing at a high speed, and the interference speckle field consists of multi-path phase-controllable fiber lasers;
a light splitting unit that splits the interference speckle field into emission light and reference light;
an emission optical unit projecting emission light to a target surface;
a reference optical unit collecting intensity distribution of reference light;
a receiving optical unit that receives return light reflected from the target and records the intensity distribution of the return light;
and the calculation control unit is used for carrying out phase control on each path of fiber laser in the array fiber laser to enable the intensity distribution to change at a high speed, and reconstructing a target image based on the intensity distribution of the reference light and the intensity distribution of the return light.
2. The system of claim 1, wherein the fiber laser phased array light source comprises a single-frequency fiber laser seed source, a fiber laser preamplifier, a beam splitter, a phase modulator array, a fiber amplifier array, a fiber collimator array, and a beam expander array, the single-frequency fiber laser seed source is first injected into the fiber laser preamplifier for power amplification, the amplified fiber laser is split by the beam splitter, each split fiber laser corresponds to one phase modulator in the phase modulator array, each phase modulator controls the phase variation of the single fiber laser, each phase-modulated fiber laser is power re-amplified by a corresponding fiber amplifier in the fiber amplifier array, each amplified fiber laser is output through a corresponding collimator in the fiber collimator array, and the beam is expanded by a corresponding beam expander in the beam expander array to reduce the divergence angle.
3. The fiber laser phased array-based target detection imaging system according to claim 2, wherein the control signal of one path of phase modulator in the phase modulator array is generated by the calculation control unit and applied to each path of phase modulator through the phase control unit.
4. The system of claim 2, wherein the fiber collimating mirrors in the fiber collimating mirror array are arranged in a plane perpendicular to the optical path according to a certain rule, and the optical axes of the emergent light of each path of fiber laser after passing through the fiber collimating mirror array are parallel to each other.
5. The target detection imaging system based on the fiber laser phased array according to claim 1, 2, 3 or 4, wherein the beam splitting unit comprises a condensing lens, a field lens, a first reflecting mirror and a beam splitter, the condensing lens converges and interferes the multi-channel fiber laser output by the fiber laser phased array light source to form an interference speckle field, the field lens images a laser beam waist on the first reflecting mirror and reflects the laser beam waist to the beam splitter through the first reflecting mirror, the beam splitter divides the incident interference speckle field into transmitted light and reflected light, the transmitted light enters the reference optical unit as reference light, and the reflected light enters the emission optical unit as emitted light.
6. The target detection imaging system based on the fiber laser phased array as claimed in claim 5, wherein the reference optical unit comprises a second reflecting mirror, a reference lens, an attenuation sheet and a CCD camera which are sequentially arranged, the reference light is reflected to the reference lens through the reflecting mirror, the reference lens is used for imaging the reference light into the CCD camera, and the attenuation sheet is used for adjusting the intensity of a light field entering the CCD camera; the CCD camera collects the intensity distribution of the reference light.
7. The fiber laser phased array based target detection imaging system according to claim 5, wherein the emission optical unit comprises an emission lens, the emission light is projected onto the target object through the emission lens, and the reflected light of the target object is received by the receiving optical unit.
8. The optical fiber laser phased array-based target detection imaging system according to claim 6 or 7, wherein the receiving optical unit is provided with a receiving lens, a third reflector, a collimating lens, a filter, a first imaging lens, a diaphragm, a second imaging lens and a single-pixel detector in sequence along the optical path direction; the receiving lens receives return light reflected from a target object, and the return light is imaged on the single-pixel detector after passing through the third reflector, the collimating lens, the optical filter, the first imaging lens, the diaphragm and the second imaging lens, so that the collection of the intensity distribution of the return light reflected by the target is realized.
9. The target detection imaging system based on the fiber laser phased array as claimed in claim 1, 2, 3, 4, 6 or 7, wherein the computing control unit comprises a computer, a phase control unit and a data acquisition unit, the computer is used to apply a phase modulation signal to each phase modulator in the phase modulator array in the fiber laser phased array light source in combination with the phase control unit, and the computer is used to collect the intensity distribution of the return light intensity signal and the reference light intensity signal and convert the intensity distribution into an electrical signal and a digital signal for data analysis, so as to reconstruct the image of the target object.
10. The object detection imaging method using the object detection imaging system based on the fiber laser phased array as claimed in claim 1, 2, 3, 4, 6 or 7, is characterized by comprising the following steps:
the optical fiber laser phased array light source comprises a calculation control unit, a fiber laser phased array light source, a fiber laser optical fiber array light source and a control unit, wherein the fiber laser phased array light source is used for generating a speckle field by interference of branch fiber light sources;
the interference speckle field is split by the light splitting unit, one path of the interference speckle field is used as reference light and enters the reference optical unit to record the spatial intensity distribution of the interference speckle field, and the other path of the interference speckle field is used as reflected light and enters the transmitting unit to project the interference speckle field onto a target object;
the return light generated by the target object is received by the receiving optical unit and the recorded return light intensity distribution is transmitted to the calculation control unit;
the calculation control unit runs a reconstruction algorithm to reconstruct an image of the target object based on the spatial intensity distribution of the interference speckle field recorded by the reference optical unit and the return light intensity distribution recorded by the receiving optical unit.
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| CN116626703A (en) * | 2023-07-21 | 2023-08-22 | 中国人民解放军国防科技大学 | Single-pixel imaging method and device based on Fermat spiral laser array |
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| CN116626703A (en) * | 2023-07-21 | 2023-08-22 | 中国人民解放军国防科技大学 | Single-pixel imaging method and device based on Fermat spiral laser array |
| CN116626703B (en) * | 2023-07-21 | 2023-09-19 | 中国人民解放军国防科技大学 | Single-pixel imaging method and device based on Fermat spiral laser array |
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