Revisions Log

A log of revisions to articles and news stories.

Jun 19 2025 - This updated version of our article on ultraviolet (UV) light provides a clearer and more comprehensive overview of the topic. We've reorganized the structure for better flow—starting with what UV light is, followed by its types, sources, measurement methods, uses, potential risks, and safety recommendations. New content includes an expanded section on Far UV-C, a simplified explanation of how UV light is measured, and a helpful video introducing the UV Index. We've also added more real-world applications, recent research studies, and updated safety tips.

Where Does Ultraviolet Light Come From and What Is It Used For?

Mar 11 2025 - The updated article retains the core explanations of mirror reflection but enhances clarity and readability. The focus has shifted from a heavily technical approach to a more structured and explanatory format, making concepts like specular vs. diffuse reflection and spherical aberration easier to understand. Additionally, terminology has been refined, with clearer explanations of virtual images, focal points, and optical axis behavior. While the core physics remains unchanged, the presentation is more accessible and engaging, making the content more useful for a broader audience.

How Does a Mirror Work?

Dec 20 2024 - Introduction Refinement: Condensed and clarified the purpose and functionality of optical sensors for better readability. Types of Optical Sensors: Organized sensor types into a more streamlined description with concise explanations for through-beam, retro-reflective, and diffuse reflection sensors. Highlighted key principles such as light transmission, reflection, and interruption for context. Biomedical and Healthcare Applications: Expanded to include disease diagnosis, biomarker detection, and therapeutic drug measurement using fiber-optic and surface plasmon resonance biosensors. Added specific example: Green-synthesized gold nanoparticle-based biosensor for cancer detection. Agricultural Applications: Enhanced details on applications like pesticide detection, crop disease monitoring, and quality control of food products. Included examples of advanced methods like photonic crystals and paper-based algal biosensors for practical use cases. Industrial and Monitoring Applications: Simplified content to focus on key uses, such as tissue engineering, pharmaceutical production, and nanoscale biomedical applications. Mentioned optical sensors' role in quality assurance and antibiotic detection in food processing. Military and Defense Applications: Refined to emphasize detection of biological and chemical threats, explosives, and pathogens using advanced optical technologies. Added examples of SPR sensors and graphene oxide-based biosensors. Future of the Optical Industry: Focused on emerging trends like quantum optics, photonic sensors, AI integration, and miniaturization. Mentioned leading companies and their contributions, e.g., Hamamatsu’s CMOS sensors for high-speed imaging. Stylistic Enhancements: Reorganized content into logical sections for improved flow and readability. Eliminated redundancies and jargon to maintain a clear and professional tone.

What are Optical Sensors Used For?

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