Off the roof: The quest to harness energy from facades
Researchers are going beyond conventional solar panels in a bid to generate heat and electricity from the other external surfaces of buildings.
Jan 29, 2024
0
5
Researchers are going beyond conventional solar panels in a bid to generate heat and electricity from the other external surfaces of buildings.
Jan 29, 2024
0
5
A new device from the lab of Dinesh Bharadia, an affiliate of the UC San Diego Qualcomm Institute (QI) and faculty member with the Jacobs School of Engineering's Department of Electrical and Computer Engineering, offers a ...
Oct 27, 2023
1
3
Traditional optical imaging and communication systems, typically composed of lenses, perform imaging operations in both forward and backward directions. Similar to a pipe that enables liquid to flow through from one end to ...
May 1, 2023
0
156
A research team based out of the University of Waterloo has developed a drone-powered device that can use Wi-Fi networks to see through walls.
Nov 3, 2022
0
224
The process of selecting specialty coffee beans entails three kinds of inspection. Two are physical and involve samples of raw and roast coffee. The third is sensory and involves tasting the drink. Certification is provided ...
Aug 30, 2022
0
30
A team of researchers at the University of California used deep learning to enable limited color vision in the dark. The group published a paper describing their work on the open-access site PLOS ONE.
WLAN and Bluetooth have limited bandwidth, making conventional wireless communication problematic in the production environment. Nevertheless, numerous components such as sensors and robots need to be wirelessly connected. ...
Mar 2, 2020
0
11
Will solar-powered wireless communication benefit millions in the years to come? That is the hope of enthusiasts seeing a future in Li-Fi, wireless technology which, said optics.org, is wireless—only not as we know it.
The visible spectrum is the portion of the electromagnetic spectrum that is visible to (can be detected by) the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 380 to 750 nm. In terms of frequency, this corresponds to a band in the vicinity of 790–400 terahertz. A light-adapted eye generally has its maximum sensitivity at around 555 nm (540 THz), in the green region of the optical spectrum (see: luminosity function). The spectrum does not, however, contain all the colors that the human eyes and brain can distinguish. Unsaturated colors such as pink, and purple colors such as magenta are absent, for example, because they can only be made by a mix of multiple wavelengths.
Visible wavelengths also pass through the "optical window," the region of the electromagnetic spectrum that passes largely unattenuated through the Earth's atmosphere. (Blue light scatters more than red light, which is why the sky appears blue.) The human eye's response is defined by subjective testing (see CIE), but atmospheric windows are defined by physical measurement.
The "visible window" is so called because it overlaps the human visible response spectrum. The near infrared (NIR) windows lie just out of human response window, and the Medium Wavelength IR (MWIR) and Long Wavelength or Far Infrared (LWIR or FIR) are far beyond the human response region.
Many species can see wavelengths that fall outside the "visible spectrum". Bees and many other insects can see light in the ultraviolet, which helps them find nectar in flowers. Plant species that depend on insect pollination may owe reproductive success to their appearance in ultraviolet light, rather than how colorful they appear to us. Birds too can see into the ultraviolet (300-400 nm), and some have sex-dependent markings on their plumage, which are only visible in the ultraviolet range.
This text uses material from Wikipedia, licensed under CC BY-SA