This communication reports the first experimental results obtained from new type of passive Hydrogen-Pressure Dosimeters for the remote measurement of nuclear radiation. Technological and experimental analyses are performed here to demonstrate the proof-of-concept. Radar measurements of irradiated and non-irradiated passive dosimeters are also reported and confirm the feasibility of the remote reading of such passive sensors. A new design is proposed for minimizing the impact of technological inaccuracies on sensors performances and for facilitating the packaging.

Abstract:A new millimetre-wave passive and chipless packaged sensor for wireless pressure monitoring in harsh environment is proposed. This sensor uses a planar microstrip resonator coupled with a high resistivity silicon membrane. The remote interrogation of this sensor is performed from a Frequency-Modulated Continuous-Wave (FMCW) radar. Prototypes have been designed and fabricated using photoresist intermediate layer for the silicon membrane bonding. Pressure characterization of packaged sensor validate the transducer and packaging hermeticity. The sensor sensitivity is close to 2% per bar for the resonant frequency and the radar response is evaluated at 2 dB per bar.