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2. Ring flash - Wikipedia

   en.wikipedia.org/wiki/Ring_flash

   An LED-based ring flash. A ring flash is a circular light that is often operated with a camera lens in the center to take photographs. Unlike point light sources, a ring flash can illuminate a subject with minimal shadows by closely and evenly surrounding the optical axis of the camera lens.

3. Oura Health - Wikipedia

   en.wikipedia.org/wiki/Oura_Health

   Oura Health Ltd (natively Oura Health Oy) [1] [2] is a Finnish health technology company, known for the Oura Ring (stylized Ōura), a smart ring used to track sleep and physical activity. The company was founded in 2013 by Petteri Lahtela, Kari Kivelä, and Markku Koskela.

4. Optical ring resonators - Wikipedia

   en.wikipedia.org/wiki/Optical_ring_resonators

   As subsequent loops around the first ring bring the light to the resonance condition of the second ring, the two rings will be coupled together and the light will be passed into the second ring. By the same method, the light will then eventually be transferred into the bus output waveguide. Therefore, in order to transmit light through a double ...

5. Ring (company) - Wikipedia

   en.wikipedia.org/wiki/Ring_(company)

   A second-generation model, Ring Doorbell 2, was released in 2017, with updated hardware and a 1080p camera with improved low-light performance, that does not rely solely on Wi-Fi, unlike the original model. [44] The Ring Doorbell Pro interoperates with Amazon Alexa to play prerecorded greetings to visitors and allow visitors to leave a message ...

6. Split-ring resonator - Wikipedia

   en.wikipedia.org/wiki/Split-ring_resonator

   A split-ring resonator (SRR) is an artificially produced structure common to metamaterials. Its purpose is to produce the desired magnetic susceptibility (magnetic response) in various types of metamaterials up to 200 terahertz .

7. Light-emitting diode - Wikipedia

   en.wikipedia.org/wiki/Light-emitting_diode

   A ring of LEDs around a video camera, aimed forward into a retroreflective background, allows chroma keying in video productions. LED for miners, to increase visibility inside mines Los Angeles Vincent Thomas Bridge illuminated with blue LEDs. LEDs are used in mining operations, as cap lamps to provide light for miners. Research has been done ...