Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
Email Facebook Twitter Google+ LinkedIn Comments

Photoacoustics Detects Water in Oil

Photonics Spectra
Aug 2001
Water contamination in lubrication and hydraulic oils is one of the primary causes of destructive wear and corrosion in machinery, making early detection desirable. Fourier transform infrared spectroscopy can detect water in oil at concentrations as low as 100 ppm, but researchers at the Pacific Northwest National Laboratory in Richland, Wash., have found that photoacoustic spectroscopy has a detection limit up to 10 times lower.

Photoacoustic spectroscopy measures the acoustic wave that is generated in a substance returning to the ground state after optical stimulation. The researchers designed a layered-prism cell for their experiments with transmission, hydraulic and engine oils. A pulsed Nd:YAG laser Raman-shifted deuterium to produce the 2.93-µm excitation light source.

Research & TechnologyTech Pulse

Terms & Conditions Privacy Policy About Us Contact Us
back to top

Facebook Twitter Instagram LinkedIn YouTube RSS
©2018 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA,
x Subscribe to Photonics Spectra magazine - FREE!