Cristina Achim (Popa), Ana-Maria Bratu, Mioara Petrus
Oxidative stress is a multifaceted issue and represents a social and health care problem because it affects many systems. The main objective of the present research is the development of a photoacoustic system with application in the assessment of astronaut’s health by measuring ethylene as a specific gas for oxidative stress level. A new way to measure noninvasively oxidative stress in humans is to measure free radical damage by analyzing early by-products of oxidation like exhaled hydrocarbons. Infrared laser absorption spectroscopy is an extremely effective tool for the detection and quantification of molecular trace gases, with a demonstrated sensitivity ranging from parts-permillion to parts-per-trillion levels depending on the specific gas species and the detection method employed. The ethylene absorption spectra show the strongest absorption band near 10.5 µm compared with that at 1.6 µm and 3.3 µm. The recent availability of the compact mid-IR QCLs allows the access of the strongest absorption band. In this research, a tunable PAS experimental system based on a CO2 laser was proposed for detection of different gases. Relationships between the photoacoustic signal and gas pressure, laser power and ethylene gas concentration were measured and discussed in detail, respectively.
acoustic measurements, photoacoustic, oxidative stress, astronauts, laser absorption spectroscopy, ethylene gas
Cite this paper
Cristina Achim (Popa), Ana-Maria Bratu, Mioara Petrus. (2018) Applied Acoustics in Space. International Journal of Applied Physics, 3, 21-31