TOD characterization of the Gatekeeper electro-optical security system

Gosselink, Guido; Anbeek, Hugo; Bijl, Piet; Hogervorst, Maarten A.

doi:10.1117/12.2016589

Cited by 3 publications

(6 citation statements)

References 12 publications

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“…For example, introducing maleimide units into the simple [5]helicene skeleton(Φ PL = 3 %) to obtain helicene derivatives (P)/(M)-Helilm(with a g abs of 4.8×10 À 3 ), where Φ PL significantly increased to 37 %. Introducing fluorene subunits into the skeleton of helicene to obtain a blue CPL [7]helicene like compound (P)- [7]helicene-like (Φ PL = 40 %), the above research provides a promising molecular design approach for the high luminescence efficiency and high CPL activity of helicene derivatives. In the same year, the Lacour group [111] reported the watersoluble zwitterion diaza helicene (Figure 3-6), which exhibited pH dependent absorption and emission characteristics.…”

Section: Helicenes Derivativesmentioning

confidence: 99%

“…In 2021, Wang group [116] reported a novel class of boronnitrogen-hetero-twisted [7]helicenes molecules (Figure 3-10). Benefiting from the multiple resonance effects between boron and nitrogen atoms, these molecules exhibited a maximum absorption at 502 nm, with a value of 0.033 for g abs .…”

Section: Helicenes Derivativesmentioning

confidence: 99%

“…However, this method requires complex devices and has low light utilization efficiency. [6][7][8] Another direct approach to generate CPL is through luminescence from chiral materials, known as CPLactive materials.…”

Section: Introductionmentioning

confidence: 99%

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Recent Advances of Chiral Isolated and Small Organic Molecules: Structure and Properties for Circularly Polarized Luminescence

Zhang,

et al. 2024

Chemistry An Asian Journal

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Circularly polarized luminescence (CPL) refers to the emission of light with distinguishable left or right circular polarization in non‐racemic systems. CPL has attracted significant attention due to its potential applications in future displays, photonics technologiesIn recent years, there has been significant development in the field of circularly polarized luminescent (CPL) materials based on small organic molecules, attributed to their precise and tunable molecular structures and high luminescent efficiency. With the continuous investigation of chiral molecular frameworks and molecular derivatization, the performance of CPL small molecules has been comprehensively promoted. We herein provide a detailed discussion on commonly studied CPL chiral frameworks of small molecules, including axially chiral binaphthyls, axially chiral biphenyls, chiral helicenes, planar chiral cyclophanes, spirocycles, metal‐centered chirality, and point chirality, aiming at providing readers with the basic understanding and research status about CPL as well as inspiration for future development.

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Section: Helicenes Derivativesmentioning

confidence: 99%

Section: Helicenes Derivativesmentioning

confidence: 99%

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Recent Advances of Chiral Isolated and Small Organic Molecules: Structure and Properties for Circularly Polarized Luminescence

Zhang,

et al. 2024

Chemistry An Asian Journal

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“…This means for the test that a 120 degrees background was required and that it needs spatial structure instead of the regular uniform TOD background in order to obtain results that are representative for operational performance. Details of the TOD test study on the Gatekeeper system are published elsewhere [30]. Example results are plotted in Figure 4.…”

Section: C6mentioning

confidence: 99%

Research topics on EO systems for maritime platforms

et al. 2014

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Our world is constantly changing, and this has its effect on worldwide military operations. For example, there is a change from conventional warfare into a domain that contains asymmetric threats as well. The availability of high-quality imaging information from Electro-Optical (EO) sensors is of high importance, for instance for timely detection and identification of small threatening vessels in an environment with a large amount of neutral vessels. Furthermore, Rules of Engagement often require a visual identification before action is allowed. The challenge in these operations is to detect, classify and identify a target at a reasonable range, while avoiding too many false alarms or missed detections. Current sensor technology is not able to cope with the performance requirements under all circumstances. For example, environmental conditions can reduce the sensor range in such a way that the operational task becomes challenging or even impossible. Further, limitations in automatic detection algorithms occur, e.g. due to the effects of sun glints and spray which are not yet well-modelled in the detection filters. For these reasons, Tactical Decision Aids will become an important factor in future operations to select the best moment to act. In this paper, we describe current research within The Netherlands on this topic. The Defence Research and Development Programme "Multifunctional Electro-Optical Sensor Suite (MEOSS)" aims at the development of knowledge necessary for optimal employment of Electro-Optical systems on board of current and future ships of the Royal Netherlands Navy, in order to carry out present and future maritime operations in various environments and weather conditions.

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“…The observer must indicate its orientation. Right: Example TOD threshold curves for an imaging system in the center of the Field of View (FOV, continuous line) and near the edge (dashed line), plotted with 1 / angular size on the ordinate, and test pattern contrast on the abscissae (from[31])…”

mentioning

confidence: 99%

ECOMOS software structure and key features

Repasi

Keßler

Bijl

et al. 2019

Electro-Optical and Infrared Systems: Technology and Applications XVI

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ECOMOS is a multinational effort within the framework of an EDA Project Arrangement. Its aim is to provide a generally accepted and harmonized European computer model for computing nominal Target Acquisition (TA) ranges of optronic imagers operating in the Visible or thermal Infrared (IR). The project involves close cooperation of defense and security industry and public research institutes from five nations: France, Germany, Italy, The Netherlands and Sweden. ECOMOS will use and combine existing European tools, to build up a strong competitive position. In Europe, there are two well-accepted approaches for providing TA performance data: the German TRM (Thermal Range Model) model and the Netherlands TOD (Triangle Orientation Discrimination) method. ECOMOS will include both approaches. The TRM model predicts TA performance analytically, whereas the TOD prediction model utilizes the TOD test method, imaging simulation and a Human Visual System model in order to assess device performance. For the characterization of atmosphere and environment, ECOMOS uses the French model and software MATISSE (Modélisation

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TOD characterization of the Gatekeeper electro-optical security system

Cited by 3 publications

References 12 publications

Recent Advances of Chiral Isolated and Small Organic Molecules: Structure and Properties for Circularly Polarized Luminescence

Recent Advances of Chiral Isolated and Small Organic Molecules: Structure and Properties for Circularly Polarized Luminescence

Research topics on EO systems for maritime platforms

ECOMOS software structure and key features

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