HOME >> BIOLOGY >> NEWS
Research Answers Burning Questions About Pollution

that excess energy in the form of light a process called fluorescence. Optical detectors then pick up that light, and a computer analyzes its wavelength and intensity to tell the researchers what type and quantities of molecules are present in the flame.

Laurendeau says this technique is very effective for learning about the combustion process, but he and his students had to overcome several challenges to make it work.

"The fluoresced light can be garbled by light from other sources," Laurendeau explains. "For example, the liquid fuel droplets reflect and scatter the laser light, which gives you a giant background signal that has to be separated out from the real signal you want to see. Also, there's a problem called 'quenching,' where the pollutant molecules lose their energy not by fluorescing light, but just by bumping into one another, which you also have to correct for."

Laurendeau and his students developed a method to compensate for the quenching called laser-saturated fluorescence.

"Basically, we take a measurement in two parts," he explains. "First, we shine the laser on the flame to obtain a 'signal' from the fluorescing nitric oxide. But that reading also contains a lot of background noise. We then change the wavelength of the laser so that we don't get a signal from the nitric oxide we're just measuring background. After we have all the data, we subtract the background noise out, and we're left with just nitric oxide measurements. The whole thing can be done in an afternoon."

Laurendeau also is experimenting with putting a special filter in front of the detector that could get rid of the background noise altogether.

When Laurendeau started his flame experiments in the early 1980s, little funding was available because no one yet knew whether it would work and there were no immediate practical ap
'"/>

Contact: Amanda Siegfried
amanda_siegfried@uns.purdue.edu
765-494-4709
Purdue University
17-Sep-1998


Page: 1 2 3 4 5

Related biology news :

1. Researchers determine genetic cause of Timothy syndrome
2. Researchers find color sensitive atomic switch in bacteria
3. Schepens Eye Research Institute receives Roadmap grant to develop center for curing eye diseases
4. Researchers identify protein promoting vascular tumor growth
5. Researchers devise potent new tools to curb ivory poaching
6. Researchers create nanotubes that change colors, form nanocarpet and kill bacteria
7. Researchers ID chlorophyll-regulating gene
8. Environmental issues center of Inland Northwest Research Alliance 4th Annual Symposium
9. Research suggests new avenue for stopping, preventing colon cancer
10. Researchers develop fast track way to discover how cells are regulated
11. Research on carbohydrate metabolism receives historical recognition

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


(Date:7/20/2017)... , July 20, 2017 Delta (NYSE: DAL ... board any Delta aircraft at Reagan Washington National Airport (DCA). ... Delta launches biometrics to ... Delta,s biometric ... Sky Club is now integrated into the boarding process to allow ...
(Date:5/23/2017)...  Hunova, the first robotic gym for the rehabilitation and functional motor ... Genoa, Italy . The first 30 robots will be ... USA . The technology was developed and patented at the ... spin-off Movendo Technology thanks to a 10 million euro investment from entrepreneur ... ...
(Date:4/24/2017)... -- Janice Kephart , former 9/11 Commission ... LLP (IdSP) , today issues the following statement: ... 6, 2017 Executive Order: Protecting the Nation ... instilled with greater confidence, enabling the reactivation of ... are suspended by until at least July 2017). ...
Breaking Biology News(10 mins):
(Date:8/23/2017)... ... August 23, 2017 , ... ... announced orders for advanced VPG+ 800 Volume Pattern Generators from two major Asian ... tomorrow’s demand for production of advanced photomasks as well as a solution for ...
(Date:8/23/2017)... (PRWEB) , ... August 23, 2017 , ... ... health systems and academic medical centers. The network provides members nationally scaled infrastructure ... drugs and biologics and restrictive payer agreements so members can provide continuity of ...
(Date:8/22/2017)... Minneapolis, MN (PRWEB) , ... August 22, 2017 ... ... dependency on opioids in pain management is the practice of opioid-dose sparing. Opioid-dose ... This practice has shown promising results, including with non-steroidal anti-inflammatory drugs (NSAIDs). , ...
(Date:8/21/2017)... USA (PRWEB) , ... August 20, 2017 , ... ... the Journal of Biomedical Optics (JBO) starting 1 January 2018. The journal is ... of Biomedical Optics publishes papers on the use of modern optical technology for ...
Breaking Biology Technology:
Cached News: