Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
Email Facebook Twitter Google+ LinkedIn Comments

  • Adjustable Responsivity Built into Microbolometers

Photonics Spectra
Aug 2002
In an air-bridge microbolometer, support beams hold the thermal infrared detector material away from the substrate, thus reducing its thermal conductance. An extremely large signal will cause the detector output to exceed the range of the readout CMOS or even damage the detector itself. However, researchers from the University of Minnesota in Minneapolis may have found a way to overcome these problems by reducing the overall responsivity of the thermal detectors when they are presented with a large signal.

They used MEMS technology to snap down the support beams to the substrate, effectively changing their thermal conductance when the detected signal exceeded certain limits. In the July 15 issue of Applied Physics Letters, they report a two-orders-of magnitude drop in responsivity, but predict that a drop as large as five orders of magnitude is possible with commercial manufacturing techniques.

Terms & Conditions Privacy Policy About Us Contact Us
back to top

Facebook Twitter Instagram LinkedIn YouTube RSS
©2016 Photonics Media
x Subscribe to Photonics Spectra magazine - FREE!