Finally, the operation of the self-powered PPG sensor was demonstrated. The operation mechanism of a PPG sensor is shown in Fig.4a. When light is emitted from the PLED and penetrates the finger, a part of the light is reflected at the blood vessels, while the remaining part is absorbed ...
phosphor technology has one very desirable property (just like in the fluorescent lamp technology and unlike blue LED/phosphor technology): the electrical-to-UV radiation conversion process performed by the semiconductor is largely independent of the color of the emitted visible light by the phosphor....
Directional: An ‘infinite’ or ‘distant’ light. Simulates a light source which is infinitely far away from the scene. A directional light has no position, only a direction. All rays emitted by a directional light are parallel and have no decay. Directional平行光:“无限远”或者“很远”的...
5. In the light emitted by the little bamboo lamps, you feel softness and warmth in the air. 6. By night, light sources inside each rod allow the whole building to glow. 7. By now that gentle chill that required a light jacket at Beijing West Railway Station has developed into frost ...
When light is emitted through both end faces of the above needlelike crystals, the so-called microcavity laser can be constituted. By arranging conductive rods at interals of an integral multiples of an oscillation wavelength, a semiconductor laser can be realized and an optical antenna can be ...
fluorescence - light emitted during absorption of radiation of some other (invisible) wavelength friar's lantern, ignis fatuus, jack-o'-lantern, will-o'-the-wisp - a pale light sometimes seen at night over marshy ground gaslight - light yielded by the combustion of illuminating gas glowing, ...
Light emitted from the fibre is de-polarized with polarization ratio of ∼1.7. No visible actuation difference in LCE has been observed by change of input laser polarization. Before each experiment, the LCE strips were alternately immersed into water and ethanol, to remove surface charge ...
A light beam is emitted from the light emitting element (laser) in the transmitter and is received with the light receiving element in the receiver. Reflective model Thrubeam model Retroreflective model Download Detection based on “Light” ...
AT the Physical Society's Conference on Fundamental Particles, held at Cambridge in July 1946, we reported that a light charged particle is occasionally emitted in the fission of uranium by slow neutrons, in addition to the two heavy fra... GREEN, L. L,LIVESEY, D. L - 《Nature》 被引...
a phenomenon known as the Stokes shift. This re-emitted light is then trapped within the host matrix by means of total internal reflection, where it is waveguided to the edges of the device. In conventional optics, there is a trade-off between the maximum concentration gain and acceptance an...