Integration/test of dual unit arrayed wide-angle camera system and its evaluation in the context of Extremely Large Telescopes

Lee, Hanshin; Vattiat, Brian L.; Subash, Uma; Poutous, Menelaos K.

doi:10.1117/12.2627344

Cited by 5 publications

(4 citation statements)

References 26 publications

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“…Larger diameter surfaces result in the generation of more etch byproducts that slow the process, and have more center-to-edge uniformity variance. Overall, the results shown in Figure 2 are very consistent and meet the spectral transmission requirements of the system unit 14,15 .…”

Section: Discussionsupporting

confidence: 70%

“…Randomly-distributed anti-reflective nanostructures were fabricated on fused silica cylindrical lenses and freeform optical elements, using a plasma-assisted reactive-ion etching technique. We examined the transmission-enhancing impact of the random nanostructures on the surfaces before their use as components of an arrayed wide-field astronomical corrector unit 14,15 .…”

Section: Discussionmentioning

confidence: 99%

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UV to IR high-efficiency antireflective surface modification of freeform and cylindrical lenses for space platform optical instrumentation

Subash,

Lee,

Poutous

2023

UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts XI

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Randomly distributed anti-reflective nanostructures were fabricated on both surfaces of cylindrical lenses and freeform optical surfaces, using a plasma assisted reactive-ion etching technique. Spectral transmission of an average 98% was measured across the range 340-800 nm. Mid-band full-angle directional scatter measurements show a difference of six orders-of-magnitude in transmission intensity between specular and off-specular angles. Measurements before and after the etching process show little to no wavefront distortion for the cylindrical lenses. As the nanostructures are etched into the optical surface their thermal and mechanical shock resilience is high, as verified by our prior work on fused silica windows.

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Section: Discussionsupporting

confidence: 70%

Section: Discussionmentioning

confidence: 99%

UV to IR high-efficiency antireflective surface modification of freeform and cylindrical lenses for space platform optical instrumentation

Subash,

Lee,

Poutous

2023

UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts XI

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“…The rARSS exhibits characteristics that are ideal to meet such a need. [21][22][23] To the best of our knowledge, research to date has primarily focused on assessing the optical transmission performance of random structures including some comparisons between lenses with thin film anti reflection (TFAR) and rARSS, 15,16,18 without investigating optical system-level effects. Potential scattering or wavefront distortions caused by the presence of rARSS-enhanced components in an optical system are not available in the existing literature.…”

Section: Introductionmentioning

confidence: 99%

High-efficiency anti-reflective modification of freeform elements and cylindrical lenses for arrayed wide-field astronomical corrector units

Subash,

Lee,

Poutous

2024

J. Astron. Telesc. Instrum. Syst.

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Randomly distributed anti-reflective nanostructures were fabricated on both surfaces of cylindrical lenses and freeform optical elements using a plasma-assisted reactiveion etching technique. An average spectral transmission of 98% was measured across the wavelength range from 340 to 800 nm. Mid-band full-angle directional scatter measurements show a difference of six orders of magnitude in transmission intensity between specular and off-specular angles. Measurements before and after the etching process show little to no wavefront distortion for the cylindrical lenses. The enhanced transmission optics were used as part of the dual-unit arrayed wide-field astronomical camera system tested on the Harlan J. Smith telescope at the McDonald Observatory, and their performance was contrasted with conventional thin film coated component performance.

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“…(3) Target localization is often inaccurate in wide-area FOV due to the small size of object in an image, making accurate localization difficult. Existing image capture methods, which often use wideangle [9] or fish-eye lenses [10], exacerbate the difficulty of target localization by introducing image distortion and quality degradation [11]. To address the intricate challenges in exists wide-area visual systems, numerous methods have been developed.…”

Section: Introductionmentioning

confidence: 99%

Region Probability Map-Guided Fast Wide-Area Multiobject Detection

Long

Chen

et al. 2023

IEEE Trans. Instrum. Meas.

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In recent years, wide-area visual surveillance systems have been widely applied in various industrial and transportation scenarios. These systems, however, face significant challenges when implementing multi-object detection due to conflicts arising from the need for high-resolution imaging, efficient object searching, and accurate localization. To address these challenges, this paper presents a hybrid system that incorporates a wide-angle camera, a high-speed search camera, and a galvano-mirror. In this system, the wide-angle camera offers panoramic images as prior information, which helps the search camera capture detailed images of the targeted objects. This integrated approach enhances the overall efficiency and effectiveness of wide-area visual detection systems. Specifically, in this study, we introduce a wide-angle camera-based method to generate a panoramic probability map (PPM) for estimating high-probability regions of target object presence. Then, we propose a probability searching module that uses the PPMgenerated prior information to dynamically adjust the sampling range and refine target coordinates based on uncertainty variance computed by the object detector. Finally, the integration of PPM and the probability searching module yields an efficient hybrid vision system capable of achieving 120 fps multi-object search and detection. Extensive experiments are conducted to verify the system's effectiveness and robustness.

show abstract

Integration/test of dual unit arrayed wide-angle camera system and its evaluation in the context of Extremely Large Telescopes

Cited by 5 publications

References 26 publications

UV to IR high-efficiency antireflective surface modification of freeform and cylindrical lenses for space platform optical instrumentation

UV to IR high-efficiency antireflective surface modification of freeform and cylindrical lenses for space platform optical instrumentation

High-efficiency anti-reflective modification of freeform elements and cylindrical lenses for arrayed wide-field astronomical corrector units

Region Probability Map-Guided Fast Wide-Area Multiobject Detection

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