Revisions Log

A log of revisions to articles and news stories.

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?

Nov 6 2024 - The new article introduces global energy demand and climate concerns as motivations for PV technology, adding context to its importance beyond basic applications mentioned in the old article. The updated version explains the photovoltaic effect in stages (photon absorption, charge separation, utilization) and introduces electron-hole pair dynamics, which were briefly mentioned in the old article. Adds detailed descriptions of PV cell layers (e.g., top glass, EVA resin, rear contact) and addresses efficiency factors like incident angle, temperature, and shading—absent in the old article. Introduces multijunction and bifacial solar cells as advanced designs to boost efficiency, not covered in the original article.

Converting Light into Electricity: How Does a Photovoltaic Cell Work?

Oct 29 2024 - New article provides a detailed timeline of optical metrology advancements from spectacles to modern lasers and AI, while the old article briefly covered optical developments. Adds advanced tools and methods, including wavefront sensors (WFSs), optical holography, and metasurfaces, broadening beyond the traditional interferometry and microscopy in the old article. Highlights challenges like sub-nanometer precision and 2D material integration for the semiconductor industry, a more detailed analysis than in the old version. The updated article introduces AI and deep learning as integral to future metrology, marking a shift toward automation and data-driven advancements not mentioned in the original article.

An Introduction to Optical Metrology

Oct 23 2024 - The new article highlights increased adoption of laser technology to meet growing demand for precious metals. It emphasizes the role of lasers in efficiency, cost reduction, and sustainability, compared to the more general introduction in the old article. The new article introduces laser-level transmitters for measurement, laser-based mineral sorting, and laser-induced breakdown spectroscopy (LIBS), which weren’t covered in the old article. The new version provides detailed descriptions of laser applications, such as ytterbium-doped fiber laser systems for drilling and LIBS for real-time analysis, adding technical specifics that the old article lacked. The new article discusses emerging technologies like autonomous face drilling and 3D spatial laser scanning, offering a forward-looking perspective that wasn’t present in the original article.

The Future of Lasers in the Mining Industry

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