ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In the following we present a low-cost optical system for cracks evolution monitoring.The transducer principle is based on the variation of light transmitted between two facing fiberswith their axial distance, exploiting the unique light-collecting capabilities of large-core polymeroptical fibers. The characterization shows that the working range of the transducer is up to 3.5cm,with a resolution of 10$m and a repeatability of 5$m. With our current custom-developed controlunit, up to four transducers can be arranged to provide a multi-axial displacement sensor or tosimultaneously monitor four points for distributed sensing. A closed-loop lightmodulation/detection scheme is implemented to reduce the environmental noise sensitivity. Thecontrol unit is interfaced to a PC via USB port or via GSM/GPRS modem to automatically sendperiodical reports of the measurements and to issue warnings in case of displacements above a giventhreshold. Extensive tests in an environmental chamber have been carried out in order to extractcalibration curves and to compensate for day-night and summer-winter temperature fluctuations
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.347.487.pdf
