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August 17th, 2004
Sensors head for lower cost, more miniaturization
Ten wireless sensors stand watch over the Ben Franklin Bridge linking Philadelphia and New Jersey. Developed by MicroStrain Inc. of Williston, Vt., the pager-size devices measure stresses on the bridge whenever commuter trains cross it. To extend the life of the devices’ batteries, they remain in “sleep” mode until an approaching train rouses them to sentience.
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