Application of dot-matrix illumination of liquid crystal phase space light modulator in 3D imaging of APD array

Wang, Shuai; Sun, Huayan; Guo, Huichao

doi:10.1117/12.2283338

Cited by 4 publications

(6 citation statements)

References 2 publications

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“…The relevant image data using the LM-APD array 3D imaging system for flight targets and space targets [1,24] are collected to qualitatively compare and analyze the effect of the simulation method.…”

Section: Comparative Analysis With Real Lm-apd 3d Imaging Resultsmentioning

confidence: 99%

“…The avalanche photodiode (APD) array detector has an all-solid-state structure, high quantum efficiency, and low operating voltage, making it very suitable for satellite plat-forms in terms of size, weight, and performance. APD arrays have two operating modes, Geiger and linear [1], of which the linear mode avalanche photodiode (LM-APD) is capable of real-time 3D imaging of moving targets and is mainly used in space-based pulsed flash laser 3D imaging systems: Some Lidars, such as DragonEYE [2,3] and STORRM VNS [4], have already started in-orbit experiments and are becoming practical. The LM-APD array is a promising imaging system for space target 3D imaging applications, but conducting experiments in orbit is difficult, and there is still a lack of corresponding hardware experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and Simulation of Space-Based LM-APD 3D Imaging

Wang

Lin²,

Zhang³

et al. 2023

Electronics

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The linear mode avalanche photodiode (LM-APD) array has the capability of real-time 3D imaging for moving targets, which is a promising 3D imaging means in space. The main system parameters of the LM-APD array 3D imaging system, the characteristics of the space target itself, and the relative positional relationship between them will affect the 3D imaging results at the same time, and there is a need for an appropriate simulation method to describe the space target point cloud acquired by the LM-APD array 3D imaging system under different conditions. We propose a simulation method for the 3D imaging of space targets with LM-APD arrays, which takes the characteristics of the space targets and the relative position into consideration, and build a link from the laser to the receiving system to simulate the echo waveform of each pixel in the LM-APD array. The experiment results under different conditions show that the proposed simulation method can accurately describe the imaging results of the LM-APD array 3D imaging system for space targets with different shapes, materials, and motion states, which providing theoretical and data support for the design of LM-APD array 3D imaging systems.

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Section: Comparative Analysis With Real Lm-apd 3d Imaging Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis and Simulation of Space-Based LM-APD 3D Imaging

Wang

Lin²,

Zhang³

et al. 2023

Electronics

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“…Single beam splitting into beam array has a variety of realization methods, such as microlens array, fiber coupling, diffractive elements, etc., but these methods still need to cooperate with other methods such as mechanical scanning after beam splitting in order to realize beam array scanning, which increases the complexity of the beam array scanning method. We previously [20] tried to use Dammann grating to realize beam splitting, and combined it with liquid crystal phase space light modulator scanning to realize the method in this paper. Figure 3 shows the structure schematically; although the generation and scanning of the beam array was realized, the energy efficiency was low and the structure was complicated.…”

Section: Fundamentals Of the Beam Array Scanning Methods For Improvin...mentioning

confidence: 99%

“…The beam array scanning is realized by adjusting the phase difference betwe array elements in the optical phased array (see Figure 6). Assuming that the optical phased array is an ideal continuous phased array, i.e., without considering the spacing between the array elements, when the beam array scans at an angle of θ x in the x direction, the modulation phase loaded by the array element with the largest phase delay ϕ max is as shown in Equation ( 20): (20) And as the delay between neighboring array elements is equidistant, the difference in modulation phase between neighboring array elements ∆ϕ OPA is as shown in Equation ( 21):…”

Section: Beam Array Scanning Phase Designmentioning

confidence: 99%

Optical Phased Array-Based Laser Beam Array Subdivide Pixel Method for Improving Three-Dimensional Imaging Resolution

Wang,

Yuan,

Wang

et al. 2023

Photonics

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The small number of pixels in the current linear mode avalanche photodiode (LM-APD) array limits its three-dimensional (3D) imaging resolution. We use an optical phased array-based beam array subdivided pixel method to improve the 3D imaging resolution, using an optical phased array to generate a beam array with the same number of pixels as the LM-APD array and matching positions and controlling each sub-beam in the beam array to scan in the field of view of the corresponding pixel. The sub-beam divergence angle in the beam array is smaller than the instantaneous field of view angle of a single pixel in the LM-APD array. The sub-beam scanning in a single pixel’s field of view realizes the multiple acquisition of the target 3D information by the LM-APD array, thus improving the resolution of the LM-APD array. The distribution of the beam array in the far field is simulated, and the main performance parameters of 3D imaging are analyzed. Finally, a liquid crystal phase modulator is used as an optical phased array device to conduct experiments on a target 20 m away, and the results prove that our method can improve the resolution from 4 × 4 to 8 × 8, which can be improved at least four times.

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“…It has the characteristics of all-solid-state, low power consumption, and no inertia, and can well meet the requirements of the spaceborne platform for beam control. The GS algorithm [4][5][6] is a commonly used method for the modulation phase design of the optical phased array [7][8][9][10][11] . In this paper, the relationship between the beam efficiency and accuracy and the number of iterations in the modulation phase of the optical phased array designed by the GS algorithm is analyzed.…”

Section: Introductionmentioning

confidence: 99%

Analysis of beam efficiency and accuracy of Gerchberg-Saxton method in multi-beam control of free space optical communication

Wang

Wei

2022

Third International Conference on Computer Science and Communication Technology (ICCSCT 2022)

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Free space laser communication has the characteristics of large bandwidth, high speed, high security and small size, and has become the preferred way of high-speed data transmission in space today. The realization of multi-beam control in free-space optical communication through optical phased array has obvious advantages in energy consumption and control accuracy. Gerchberg-Saxton (GS) is a commonly used modulation phase design method for optical phased arrays. This paper analyzes the relationship between the beam efficiency and accuracy and the number of iterations in the modulation phase of optical phased arrays designed by the GS algorithm. The results show that in the ideal case, the beam efficiency increases with the number of iterations of the GS algorithm, and eventually tends to be stable; the beam pointing accuracy increases with the number of iterations of the GS algorithm, and finally tends to be stable, and the speed of stable convergence is faster than the beam efficiency.

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Application of dot-matrix illumination of liquid crystal phase space light modulator in 3D imaging of APD array

Cited by 4 publications

References 2 publications

Analysis and Simulation of Space-Based LM-APD 3D Imaging

Analysis and Simulation of Space-Based LM-APD 3D Imaging

Optical Phased Array-Based Laser Beam Array Subdivide Pixel Method for Improving Three-Dimensional Imaging Resolution

Analysis of beam efficiency and accuracy of Gerchberg-Saxton method in multi-beam control of free space optical communication

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