asteroza + ir   202

Broadband lightweight flat lenses for long-wave infrared imaging | PNAS
Interesting, a nearly flat minilens (microlens?)array that covers visible and long wave IR. Called a MDL (multilevel diffractive lens)
optics  research  technology  visible  long  wave  IR  LWIR  thin  film  microlens  array  flat  materials  science  polymer  multilevel  diffractive  lens 
4 days ago by asteroza
Generating Light from Darkness: Joule
Using narrowband emitters to emit heat through the atmospheric IR window, you can make a plate cold on the sky facing side, creating a heat difference a thermoelectric generator can utilize
narrowband  IR  emitter  surface  treatment  atmospheric  window  heat  differential  night  sky  thermoelectric  generator 
4 weeks ago by asteroza
New short wave IR sensor made on CMOS semiconductors for cheap, for autonomous car sensing in foggy and obscured conditions, rather than InGaAs semiconductors which are expensive...
shortwave  IR  SWIR  sensor  hardware  electronics  devices  israel 
7 weeks ago by asteroza
OSA | Study of W/HfO2 grating selective thermal emitters for thermophotovoltaic applications
Interesting, tungsten with a hafnium oxide grating over it has highly selective IR emittance, making it well matched for gallium based TPV cells
tungsten  emitter  hafnium  oxide  transverse  magnetic  polarization  surface  plasmon  shaping  IR  TPV  cell  matching  power  generator  materials  science  research  technology 
9 weeks ago by asteroza
A radiative cooling structural material | Science
using boiling hydrogen peroxide, these researchers reduced/compressed wood by removing the lignin, making an engineered wood with interesting properties, such as high strength. The kicker is that the white material is also a narrowband IR emitter tuned to dump heat to space through the atmospheric windows, so it can cool you in broad daylight.
engineered  wood  lignin  removal  narrowband  IR  emitter  atmospheric  window  insulation  cooling  subambient 
may 2019 by asteroza
Database of Observation Satellites
Listing commercial/gov sats, film canister sats after 2000. University stuff not listed
remote  sensing  earth  observation  satellite  database  reference  information  commercial  government  optical  IR 
april 2019 by asteroza
Concentrated Solar Photovoltaics provide both electricity and heat.
Last pic has a split hybrid CSP system, with visible spectrum PV with an IR reflector, feeding IR to a fiber line for use elsewhere in a high temp electrolysis cell.
hybrid  CSP  PV  thermal  IR  fiber  optic  transfer  power  generator  solar  high  temperature  electrolysis  hydrogen  gas  production  syngas  CO2  cracking 
march 2019 by asteroza
Plasmonic p–n Junction for Infrared Light to Chemical Energy Conversion - Journal of the American Chemical Society (ACS Publications)
Making hydrogen gas with IR light. Though one wonders where direct conversion with this photocatalyst is better than using a frequency converter intermediary and a different photocatlyst...
japa  hydrogen  production  materials  science  research  technology  IR  cadmium  copper  sulfide  photocatalyst  heterostructure  nanocrystal  surface  plasmon  solar  fuel 
march 2019 by asteroza
Contactless steam generation and superheating under one sun illumination | Nature Communications
Okay, it's cheating to say one sun when using a concentrator, but switch from direct contact heat transfer with capillary flow to IR emitter and vapor passthru is interesting
carbon  foam  solar  heat  absorber  IR  thermal  emitter  steam  generator  passive  materials  science  research  technology 
december 2018 by asteroza
Broadband Light Management with Thermochromic Hydrogel Microparticles for Smart Windows: Joule
Using 500nm thermochromic nanoparticles to turn glass frosty at 85F, and reject outside IR heat. So if it gets warm, a window can turn transluscent to stop solar heating.
thermochromic  IR  filter  window  surface  coating  materials  science  research  technology  hydrogel  thin  film 
november 2018 by asteroza
Simultaneously and Synergistically Harvest Energy from the Sun and Outer Space - ScienceDirect
If you can take out the backing metal foil of a PV panel, then line the bottom with a narrow band IR re-emitter that converts rooftop heat to a band that can escape out of the atmospheric IR window, allows roof cooling and power generation simultaneously in theory.
solar  PV  panel  narrowband  IR  emitter  roof  cooling  power  generator  materials  science  research  technology 
november 2018 by asteroza
Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling | Science
New cheapish polymer coating to make a narrowband IR emitter that pumps through the LWIR atmospheric transmission window. So something can be cooled by exposing it to the sky.
passive  daytime  radiative  cooling  narrowband  emitter  IR  materials  science  research  technology  polymer  surface  coating  air  void  phase  inversion 
october 2018 by asteroza
Wearable MRI
Using sound somehow to redirect infrared light to allow internal imaging like an MRI. Uses some sort of holographic imaging technique.
infrared  IR  optical  scanning  MRI  medicine  health  portable  hardware  electronics  devices  holographic  imaing  sound  focus  optics 
august 2018 by asteroza
New Material Developed for Army Night-Time Operations
New InAsSb based IR sensor using a intermediate layer between GaAs, GASb, and InAsSb
IR  sensor  InAsSb  materials  science  research  technology  infrared  nightvision  strain  mediation  long  wavelength 
january 2018 by asteroza
RECOIL: FPS Brought to Life | Available Now
Interesting, an different take on updating classic lasertag. Appears to use a special wifi router along with game specific IR blaster weapons and damage sensors (links to the phone via bluetooth?). Somewhat similar to Father.IO but with full handheld weapons and using normal if location specific wifi (rather than Father.IO's direct 900MHz ISM links with bluetooth to the phone)
lasertag  AR  game  IR  blaster  android  iphone  app  software  hardware  electronics  devices  wifi  router 
september 2017 by asteroza
SkyCool Systems: The future of cooling
Rejecting heat through atmospheric IR windows to space from the ground. Potentially cooling to sub-ambient!
atmospheric  IR  window  heat  rejection  cooling  HVAC 
september 2017 by asteroza
Scalable-manufactured randomized glass-polymer hybrid metamaterial for daytime r...
Yet another IR narrowband emitter/frequency converter that rejects to space, but interesting method...
selective  IR  emitter  research  technology  metamaterial  materials  science  narrowband  frequency  converter  TPX 
march 2017 by asteroza
Near-infrared–to–visible highly selective thermal emitters based on an intrinsic...
New work on using nanorods for a wide frequency converter, to effectively change a solar cell's efficiency by converting waste spectrum into usable spectrum
photonic  resonance  nanorod  frequency  converter  IR  visible  materials  science  research  technology  selective  emitter  Delicious 
january 2017 by asteroza
Radiative cooling to deep sub-freezing temperatures through a 24-h day–night cyc...
New record, but requires shading from direct sunlight, and a vacuum chamber, and a zinc selenide emission window on the vacuum chamber wall. But 37 degrees below atmospheric ambient is pretty damn good.
atmospheric  IR  window  heat  rejection  vacuum  chamber  zinc  selenide  cooling  Delicious 
december 2016 by asteroza
MIT technology used to shrink tumor | MIT News
Omniguide is producing high power laser fiber guides for IR lasers, for use in medical applications, using advanced hollow fibers with the hollow core coated by the new omnidirectional mirrors described here.
CO2  IR  laser  fiber  tunable  mirror  reflector  omnidirectional  materials  science  research  technology  Delicious 
november 2016 by asteroza
5.6 μm quantum cascade lasers based on a two-material active region composition ...
new quantum cascade,lasers, using a more manufacturable 2 material composition rather than a more exotic 5 material composition. IR tunable, runs at room temperatures, but pulsed though (but looks amenable to continuous wave operation)
quantum  cascade  laser  IR  physics  materials  science  manufacturing  research  technology  Delicious 
october 2016 by asteroza
An Overview – KYMIRA Sport
Uh, heat generally is IR, so is this some sort of selective frequency converter, or are they simply putting an IR reflector in the clothing? Reading the original copy made me think this was using some sort of fabric that emits heat when stretched, but that doesn't seem to be the case.
IR  reflector  insulating  clothing  apparel  Delicious 
june 2016 by asteroza
OSA | Total absorption of visible light in ultrathin weakly absorbing semiconductor gratings
Conventional semiconductor gratings can absorb IR much more than thought by adjusting grating size. Looks applicable to nightvision and other optics (solar thermal?)
NIR  IR  visible  light  absorption  semiconductor  grating  materials  science  optics  research  technology  Delicious 
may 2016 by asteroza
Magnetic hyperbolic optical metamaterials : Nature Communications : Nature Publishing Group
New metamaterial allows conversion of wideband IR into enhanced narrowband IR, suitable for TPV and atmospheric heat rejection to space.
magnetic  hyperbolic  dispersion  metamaterial  materials  science  research  technology  nanotechnology  lens  filter  frequency  concentrator  IR  TPV  thermophotovoltaic  converter  narrowband  emitter  Delicious 
april 2016 by asteroza
Tailoring high-temperature radiation and the resurrection of the incandescent source : Nature Nanotechnology : Nature Publishing Group
Using an IR reflector photonic crystal rather than conventional glass in a lightbulb recycles IR energy back into the filament, making efficiency equal or potentially better than current LED's.
photonic  crystal  IR  reflector  incandescent  filament  lightbulb  materials  science  research  technology  Delicious 
january 2016 by asteroza
Radiative cooling of solar absorbers using a visibly transparent photonic crystal thermal blackbody
Uses the IR window reradiation trick to cool an object by cooling towards space, as space is a heatsink.
photonic  crystal  IR  radiative  cooling  surface  coating  materials  science  research  technology  solar  cell  Delicious 
september 2015 by asteroza
Hybrid Molecule–Nanocrystal Photon Upconversion Across the Visible and Near-Infrared - Nano Letters (ACS Publications)
Interesting hybrid organic/inorganic frequency converter, takes 2 IR photons in, upconverts to single higher frequency photon. Not quite a frequency doubler, but possibly still useful. Since you aren't wasting IR inputs
inorganic  nanocrystal  organic  ligand  composite  materials  science  research  technology  IR  infrared  photon  frequency  upconversion  conversion  upgrade  solar  PV  Delicious 
august 2015 by asteroza
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