Search Menu
Photonics Media Photonics Buyers' Guide Photonics Spectra BioPhotonics EuroPhotonics Vision Spectra Photonics Showcase Photonics ProdSpec Photonics Handbook
More News

Optical Sensor Monitors pH

Facebook Twitter LinkedIn Email Comments
A team at Kyushu University in Fukuoka, Japan, says its laser-based pH sensor will be at least as sensitive as a fluorometric device. The sensor, reported in Analytical Chemistry, comprises a gel grating of the pH-sensitive thymolphthalein, which is transparent at pH <9.3 and blue at pH >10.5, and a 2-mW, 633-nm HeNe laser light source. A photodiode and digital oscilloscope measure the diffracted beam's intensity, and a digital camera records the diffraction pattern, which changes in response to alkalinity.

Photonics Spectra
Jan 2000
Basic ScienceResearch & TechnologySensors & DetectorsTech Pulse

back to top
Facebook Twitter Instagram LinkedIn YouTube RSS
©2019 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA,

Photonics Media, Laurin Publishing
x Subscribe to Photonics Spectra magazine - FREE!
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.