Phys.org March 24, 2022 Blow flies sample the environment as they search for water and food sources and can be trapped from kilometers away using baited traps. Researchers at Purdue University exposed three species of blow flies to the chemical warfare agent (CWA) simulants dimethyl methylphosphonate and diethyl phosphoramidate as well as the pesticide dichlorvos, followed by treatment-dependent temperature and humidity conditions. At intervals within a 14-day postexposure period the fly guts were extracted and analyzed. They found that the amount of CWA simulant in fly guts decreased with time following exposure but were detectable 14 days following exposure, giving […]
Tag Archives: Chemical sensors
Laser technology: The turbulence and the comb
Nanowerk June 18, 2020 While investigating circular quantum cascade lasers, an international team of researchers (USA – Harvard University, Texas A&M, Yale University, Italy, Austria) found out that the circular mini-lasers can be used in a very simple way to produce frequency combs. They found that turbulence is the driving force that causes the oscillation leading to frequency combs. Optical frequency comb can be used to build tiny chemical sensors…read more. TECHNICAL ARTICLE
Novel laser technology for microchip-size chemical sensors
Science Daily December 10, 2018 Researchers in Austria produced quantum cascade lasers which generate a frequency comb in the infrared range. With the help of an electrical signal of a specific frequency the quantum cascade lasers can be controlled to emit a series of light frequencies, which are all coupled together. The system is robust and can withstand temperature fluctuations, or reflections that send some of the light back into the laser. It can be easily miniaturized. The entire measuring system can be accommodated on a chip in millimeter format. The chip could be placed on a drone to measure […]