Featured Research

from universities, journals, and other organizations

Integrated dual-mode active and passive infrared camera

Date:
January 16, 2013
Source:
Northwestern University
Summary:
Researchers have found a way to integrate active and passive infrared imaging capability into a single chip, opening the way to lighter and simpler dual-mode cameras.

A Center for Quantum Devices researcher holds a heater and a narrow-band filter centered at 3.6m. The heater can be seen when imaged with the band-pass detectors sensitive up to 4.5m (left), but not in the ones with shorter detection wavelengths up to 2.2m (right).
Credit: Image courtesy of Northwestern University

High-performance infrared cameras are crucial for civilian and military applications such as night-vision goggles and search-and-rescue operations. Existing cameras usually fall into one of two types: active cameras, which use an invisible infrared source to illuminate the scene, usually in the near or short-wavelength infrared; and passive cameras, which detect the thermal radiation given off by a warm object, typically in the mid- or long-wavelength infrared, without the need for any illumination. Both camera types have advantages and disadvantages in the field.

Integrating both modes of imaging into a single camera would open new possibilities -- but doing so has proven challenging. Until now, dual-mode active and passive infrared cameras needed either two different infrared detectors or complex controllable filters to accommodate the different wavelengths, and then required additional signal processing to reconstruct a single image from the two modes.

However, in a move that may change the way we look a two-color imaging, researchers at the Northwestern University's Center for Quantum Devices have now found a way to integrate active and passive infrared imaging capability into a single chip. This opens the way to lighter and simpler dual-mode active/passive cameras with lower power dissipation.

A paper about the findings was published January 1 in the journal Optic Letters. The work was led by Manijeh Razeghi, Walter P. Murphy Professor of Electrical Engineering and Computer Science in Northwestern's McCormick School of Engineering and Applied Science.

The researchers achieved this feat by engineering the quantum properties of novel semiconductor materials called the indium arsenide/gallium antimonide (InAs/GaSb) type-II superlattices. Researchers at the center have been pioneering the development of type-II superlattices as a superior replacement of aging mercury-cadmium-telluride (HgCdTe) infrared camera technology in terms of both performance and cost.

Using the unique band-structure engineering capabilities of type-II superlattices, they have developed a new structure incorporating two different superlattices with different layer spacings, thus enabling detection with a cutoff wavelength of either 2.2m (active mode) or 4.5m (passive mode). This new device can simply switch from passive to active mode by a very small change in bias.

The work was funded by the Defense Advanced Research Projects Agency.


Story Source:

The above story is based on materials provided by Northwestern University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Edward Kwei-wei Huang, Abbas Haddadi, Guanxi Chen, Anh-Minh Hoang, Manijeh Razeghi. Active and passive infrared imager based on short-wave and mid-wave type-II superlattice dual-band detectors. Optics Letters, 2012; 38 (1): 22 DOI: 10.1364/OL.38.000022

Cite This Page:

Northwestern University. "Integrated dual-mode active and passive infrared camera." ScienceDaily. ScienceDaily, 16 January 2013. <www.sciencedaily.com/releases/2013/01/130116111742.htm>.
Northwestern University. (2013, January 16). Integrated dual-mode active and passive infrared camera. ScienceDaily. Retrieved August 21, 2014 from www.sciencedaily.com/releases/2013/01/130116111742.htm
Northwestern University. "Integrated dual-mode active and passive infrared camera." ScienceDaily. www.sciencedaily.com/releases/2013/01/130116111742.htm (accessed August 21, 2014).

Share This




More Matter & Energy News

Thursday, August 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Flower Power! Dandelions Make Car Tires?

Flower Power! Dandelions Make Car Tires?

Reuters - Business Video Online (Aug. 20, 2014) Forget rolling on rubber, could car drivers soon be traveling on tires made from dandelions? Teams of scientists are racing to breed a type of the yellow flower whose taproot has a milky fluid with tire-grade rubber particles in it. As Joanna Partridge reports, global tire makers are investing millions in research into a new tire source. Video provided by Reuters
Powered by NewsLook.com
Awesome New Camouflage Sheet Was Inspired By Octopus Skin

Awesome New Camouflage Sheet Was Inspired By Octopus Skin

Newsy (Aug. 19, 2014) Scientists have developed a new device that mimics the way octopuses blend in with their surroundings to hide from dangerous predators. Video provided by Newsy
Powered by NewsLook.com
Researcher Testing on-Field Concussion Scanners

Researcher Testing on-Field Concussion Scanners

AP (Aug. 19, 2014) Four Texas high school football programs are trying out an experimental system designed to diagnose concussions on the field. The technology is in response to growing concern over head trauma in America's most watched sport. (Aug. 19) Video provided by AP
Powered by NewsLook.com
Green Power Blooms as Japan Unveils 'hydrangea Solar Cell'

Green Power Blooms as Japan Unveils 'hydrangea Solar Cell'

AFP (Aug. 19, 2014) A solar cell that resembles a flower is offering a new take on green energy in Japan, where one scientist is searching for renewables that look good. Duration: 01:29 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins