Acta Photonica Sinica, Volume. 51, Issue 5, 0511003(2022)
Three-dimensional Correlation Imaging Based on Time-of-flight Technology
Different from traditional optical imaging technology, correlated imaging uses a single-pixel detector and a spatial light modulator to reconstruct object image information based on correlation calculations, having the characteristics of super-resolution, non-local, and anti-interference. Time-of-flight (TOF) technology is an effective method for optical remote sensing and three-dimensional imaging of target recognition. Compared with traditional laser correlation imaging, 3D correlation imaging can not only obtain the two-dimensional light field intensity information of the target object, but also effectively obtain the longitudinal distance information between the target objects, so that the size and position of the imaging target can be quantitatively analyzed. Three-dimensional correlation imaging technology mainly includes steroscopic vision and TOF imaging technology. To improve the image reconstruction quality of intensity 3D correlation imaging, this paper employs differential correlation imaging reconstruction algorithm and TOF technology, and the theoretical formula of intensity correlation 3D imaging is deduced. The working mode is that the short-pulse laser forms pseudothermal light through the rotating frosted glass. After passing through the beam splitter, one of the beams irradiates the target object to be measured and then is received by the Photomultiplier Tube (PMT); the other beam is detected by the array detector. The high-speed data acquisition system digitizes the peak light intensity signal detected by the PMT into discrete data points, uses the TOF technology to divide the detection signal into slice signals of different time (distance), and then integrates the signals in the respective slices to obtain the slice signal detection value, and finally the DGI algorithm is used to perform two-dimensional correlation imaging reconstruction calculation for each slice signal separately. This paper mainly investigates the influence of the light source laser power and reconstruction algorithm parameters on the imaging quality in the pseudo-thermo-optic 3D correlation imaging. The imaging results of two flat objects to be measured (the front-end target is a four-pointed star and the back-end target is the letter F) with a distance of 80 cm and a resolution of 200 pixel × 200 pixel in the numerical simulation are given. Among them, the simulation pulse laser uses the function
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Huiji WANG, Nan LI, Xuankui LI, Cheng ZHOU, Lijun SONG. Three-dimensional Correlation Imaging Based on Time-of-flight Technology[J]. Acta Photonica Sinica, 2022, 51(5): 0511003
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Received: Nov. 12, 2021
Accepted: Jan. 21, 2022
Published Online: Jun. 27, 2022
The Author Email: SONG Lijun (ccdxslj@126.com)