abstract |
A remote sensor system ( 60 ) and method for passively sensing environmental conditions, such as temperature and humidity, uses a magnetic impulse from an AC interrogation coil ( 68 ) to stimulate a magnetoelastic sensor ( 62 ) to generate an acoustic signal (AE) at the resonant frequency of the magnetoelastic sensor ( 62 ). The acoustic signal (AE) is received by amplifier ( 74 ), detected and displayed ( 76 ). The systems and methods are particularly suited for detecting environmental conditions in commercial pharmaceutical packaging, such as blister packs. |