HOME >> BIOLOGY >> NEWS
Terahertz imaging goes the distance

BALTIMORE, April 26 -- Terahertz (THz) radiation, or far-infrared light, is potentially very useful for security applications, as it can penetrate clothing and other materials to provide images of concealed weapons, drugs, or other objects. However, THz scanners must usually be very close to the objects they are imaging. Doubts have lingered over whether it is possible to use THz waves to image objects that are far away, because water vapor in air absorbs THz radiation so strongly that most of it never reaches the object to be imaged.

At the upcoming CLEO/QELS meeting in Baltimore, an MIT-Sandia team will demonstrate the first real-time THz imaging system that obtains images from 25 meters away. The technique takes advantage of the fact that there are a few "windows," or frequency ranges, of the terahertz spectrum that do not absorb water very strongly. The MIT-Sandia group designed a special, semiconductor-based device known as a "quantum cascade laser" that delivers light in one of these windows (specifically, around 4.9 THz). They shine this light through a thin target with low water content (for example, a dried seed pod), and a detector on the other side of the sample records an image.

A cryorefrigerator maintains the laser at a temperature of 30 Kelvin, where it produces 17 milliwatts of power (as opposed to the microwatts of power typical of pulsed terahertz sources) in order to provide enough terahertz radiation to obtain a decent image. Increasing the power of the lasers and sensitivity of the detectors can potentially enable imaging of thicker objects or imaging of the reflected light, which would be more practical for security applications. In addition, the development of high-operating-temperature quantum cascade lasers, which operate without the use of cryogenic materials, may also increase the availability of this approach. In the closer term, however, this approach may enable sensing of chemical residues or contaminants in th
'"/>

Contact: Colleen Morrison
cmorri@osa.org
202-416-1437
Optical Society of America
26-Apr-2007


Page: 1 2

Related biology news :

1. New imaging method clarifies nutrient cycle
2. Methodist, University of Houston, Cornell combine biomedical imaging expertise
3. 2007 Image of the Year: Molecular imaging relates human brain chemistry to aggressive behavior
4. SNM advances professional definition for molecular imaging
5. Combining molecular imaging technologies to stop/prevent heart attacks
6. A first: Simultaneous PET/MR images of the brain debut, increase molecular imaging capabilities
7. Fusing imaging technologies creates synergy, helps diagnose heart disease accurately
8. Decoding gene expression in cancer tumors using noninvasive imaging
9. FDG-PET imaging clearly predicts lung cancer patients response to chemotherapy
10. InfoSNM highlights advances in computer, information sciences for molecular imaging
11. New imaging approach promises insights into multiple sclerosis

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:8/26/2020)... HOUSTON (PRWEB) , ... August 25, 2020 , ... ... it made Inc. magazine’s 2020 annual Inc. 5000 list. The list is the most ... list in 2019 as well, and for this year’s list, reported three-year revenue growth ...
(Date:8/21/2020)... ... August 18, 2020 , ... Sentien Biotechnologies, ... that the U.S. Food and Drug Administration (FDA) has approved the company’s Investigational ... the treatment of severe COVID-19. Approval of this IND allows Sentien to initiate ...
(Date:8/21/2020)... ... August 19, 2020 , ... ... expo uniting life science, data science, informatics and IT leaders goes VIRTUAL and ... period of uncertainty and change, Bio-IT takes the leadership role of keeping our ...
Breaking Biology News(10 mins):
(Date:9/1/2020)... ... September 01, 2020 , ... Slone Partners ... has announced the placement of Julianne Averill , CPA, as Chief Financial ... financial operations and implementing key business strategies to accelerate Alveo’s growth as the ...
(Date:8/15/2020)... (PRWEB) , ... August 13, 2020 , ... True ... the creation of its Scientific Advisory Board (SAB) to research the medical potential of ... can be enhanced when combined with terpenes. The board is focused on expanding the ...
(Date:8/12/2020)... ... August 11, 2020 , ... The FSHD Society ... Muscular Dystrophy Clinical Trial Research Network (FSHD CTRN), with consideration of ... a consortium of academic research centers in the United States and Europe with ...
(Date:8/12/2020)... ... August 12, 2020 , ... ... International), a global leader in FDA compliance consulting has been named on its ... companies. The list represents a unique look at the most successful companies within ...
Breaking Biology Technology:
Cached News: