Close

Search

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

Fiber Optic Sensor Gauges Steel Volatility

Photonics.com
Mar 2000
The process of welding adds diffusible hydrogen to steel, causing embrittlement of the weld. The steel could even explode if concentrations get too high. Although scientists have been detecting hydrogen with volumetric displacement since 1950 and with gas chromatography more recently, Rodney D. Smith II and his colleagues have developed a detection method based on fiber optics.
   Smith conducted the research for his doctoral thesis but has since been hired by DCH Technology to continue his work. Unlike previous techniques, the fiber optic sensor can be attached directly to steel, and the material can be analyzed in less than an hour (compared with more than 24 hours for traditional methods, and even up to a week, in some cases).
   The researchers are still working out some problems -- such as the most effective sealing method -- but their latest design has achieved detection as low as 0.1 percent hydrogen in argon. They have shown that the device can detect hydrogen in steel several hours after welding, without any special storing methods. Smith has conducted practical tests with HSLA 100 steel, which is used in shipbuilding by the US Navy.

industrialNews & FeaturesSensors & Detectors

Comments
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, info@photonics.com

Photonics Media, Laurin Publishing
x We deliver – right to your inbox. Subscribe FREE to our newsletters.
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.