Visible light imaging is a family of methods that acquire spatially resolved information using electromagnetic radiation in the 400–700 nm range, detected by human-vision–matched sensors such as CCD or CMOS arrays. It encompasses bright-field microscopy, color and monochrome photography, and machine-vision systems that rely on reflected, transmitted, or emitted visible photons to generate contrast based on absorption, scattering, and fluorescence within this spectral band. These methods are widely used for noninvasive inspection, documentation, and quantitative analysis, often combined with controlled illumination, optical filters, and computational processing to enhance signal-to-noise ratio, extract morphological or spectral features, and enable automated measurement or classification.
Photoplethysmography (PPG) is an optical sensing technique that measures blood volume changes and underpins devices ranging from hospital-grade pulse oximeters to consumer wearables that track heart rate, sleep, and oxygenation.
Optics & Photonics
Dec 10, 2025
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Agricultural producers and manufacturers often need information about crop attributes, from nutrient content to chemical composition, to make management decisions. In recent years, multispectral imaging has emerged as a useful ...
Biotechnology
Nov 19, 2025
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A team of European researchers has developed a versatile, open-source luminescence imaging instrument designed to democratize access to advanced fluorescence and electroluminescence techniques across disciplines ranging from ...
Optics & Photonics
Nov 7, 2025
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When German physicist Wilhelm Röntgen discovered X-rays in the late 1800s while experimenting with cathode ray tubes, it was a breakthrough that transformed science and medicine. So much so that the basic concept remains ...
Optics & Photonics
Sep 18, 2025
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Over the past decades, computer scientists have developed increasingly sophisticated sensors and machine learning algorithms that allow computer systems to process and interpret images and videos. This tech-powered capability, ...
Everyone who ever took a photo knows the problem: if you want a detailed image, you need a lot of light. In microscopy, however, too much light is often harmful to the sample—for example, when imaging sensitive biological ...
Optics & Photonics
Aug 20, 2025
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Researchers at the UCLA Samueli School of Engineering, in collaboration with the Optical Systems Division at Broadcom Inc., report a broadband, polarization-insensitive unidirectional imager that operates in the visible spectrum, ...
Optics & Photonics
Aug 11, 2025
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In an advance at the intersection of neuromorphic engineering and photonics, researchers have developed an ionic-electronic photodetector that not only detects light but also performs in-sensor image processing, offering ...
Optics & Photonics
Aug 4, 2025
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Canada is facing another dangerous wildfire season, with burning forests sending smoke plumes across the provinces and into the U.S. again. The pace of the 2025 fires is reminiscent of the record-breaking 2023 wildfire season, ...
Environment
Jul 28, 2025
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Ghost imaging is like a game of Battleship. Instead of seeing an object directly, scientists use entangled photons to remove the background and reveal its silhouette. This method can be used to study microscopic environments ...
Optics & Photonics
Jul 28, 2025
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