Use of bidirectional transmittance distribution function measurements to determine transmittance haze

Ellie, Molloy,; Koo, Annette; Gevaux, Lou; Obein, Gaël; Li, Yang

doi:10.1088/1681-7575/ace910

Cited by 2 publications

(3 citation statements)

References 8 publications

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“…While there are previous studies pointing out some limitations of the standard haze measurement techniques, even for thin sheets (see Molloy et al 2023), here we argue that their most important limitation is related to their invalidity for thicker materials, such as the laminates we are interested in.…”

Section: Limitations Of Conventional Hazemetersmentioning

confidence: 66%

“…Haze involves scattering only a portion of the light rays, but those scattered deviate at high and random angles. Conversely, a lack of clarity arises from interactions that scatter a significant portion of the light, primarily at small angles (see Molloy et al 2023).…”

Section: Understanding Hazementioning

confidence: 99%

“…There are several standards currently used in the haze measurements with application mostly in the plastics industry, all of which agree on the definition of haze as the relative intensity of light scattered to an angle of more than 2.5 degrees when a collimated light ray passes through the transparent sheet of material. All the above standards agree on the use of an integrating sphere as a measurement method for haze according to this definition (see Molloy et al 2023).…”

Section: Haze According To Standardmentioning

confidence: 99%

See 2 more Smart Citations

A Portable Technology for Measuring Haze Levels in Thick Laminated Glass Panels

Casas,

Marcipar,

Betanzos

2024

CGC

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Increasing security concerns and a trend towards larger glass panels are driving the adoption of thicker laminate glass panels in prominent architectural works worldwide. However, the polymeric materials used in these laminates can lead to haze, a detrimental optical defect that impairs transparency perception, particularly when used in thick, multi-layer laminates. This work presents a novel technology capable of accurately and robustly measuring haze in glass laminates of arbitrary thickness, based on using computer-vision to measure changes in contrast when viewing a standard mask through the material under controlled diffuse lighting conditions. Unlike previous approaches, this technology can be employed on installed glasses without requiring exposed edges for double-sided measurements, making it suitable for on-site work. The experimental evidence provided indicates that its precision and robustness are adequate for quality control.

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Section: Limitations Of Conventional Hazemetersmentioning

confidence: 66%

Section: Understanding Hazementioning

confidence: 99%

Section: Haze According To Standardmentioning

confidence: 99%

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A Portable Technology for Measuring Haze Levels in Thick Laminated Glass Panels

Casas,

Marcipar,

Betanzos

2024

CGC

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Stray light analysis and suppression of high-resolution camera line-of-sight variation real-time monitoring system (LoS Var RTMS)

Liu,

Xie

et al. 2024

Opt. Express

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Due to environmental disturbances during emission and operation processes, the line-of-sight of a high-resolution camera is highly prone to variation, resulting in a significant decrease in image positioning accuracy. To address this issue, we propose a line-of-sight variation real-time monitoring system (LoS Var RTMS). A full-link active optical monitoring system is established using laser, and a high-resolution camera is coupled to a star tracker, thereby enhancing the on-orbit calibration and image positioning accuracy of the camera. However, the high-resolution camera LoS Var RTMS belongs to a high stray light sensitivity system. Stray light entering the star tracker from the high-resolution camera through the relay reflective system can significantly affect the imaging of the star tracker, leading to the failure of the monitoring system. Therefore, a comprehensive and accurate analysis of the stray light propagation path in the monitoring system is necessary to ensure its normal operation. In response to this issue, this article proposes a stray light analysis method based on the surface subdivision method, and utilizes inverse ray tracing to meticulously analyze the propagation path of stray light. Additionally, to address the impact of stray light on laser light in the LoS Var RTMS, an inner baffle polarization filtering system is designed to effectively suppress the influence of external strong stray light on the monitoring system. The results demonstrate that the stray light analysis method based on the surface subdivision method not only enhances the integrity and accuracy of the analysis of stray light propagation paths within the monitoring system, but also significantly improves the precision of stray light analysis. It provides a reference for the analysis of stray light in high stray light sensitive systems. Moreover, the design of the inner baffle polarization filtering system effectively distinguishes between lasers and stray light, suppressing stray light within the high-resolution camera LoS Var RTMS and ensuring its normal operation.

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Use of bidirectional transmittance distribution function measurements to determine transmittance haze

Cited by 2 publications

References 8 publications

A Portable Technology for Measuring Haze Levels in Thick Laminated Glass Panels

A Portable Technology for Measuring Haze Levels in Thick Laminated Glass Panels

Stray light analysis and suppression of high-resolution camera line-of-sight variation real-time monitoring system (LoS Var RTMS)

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