Abstract
A surface acoustic wave based passive temperature sensor capable of multiple access is investigated. Binary Phase Shift Keying (BPSK) codes of eight chips were implemented using a reflective delay line scheme on a Y-Z LiNbO3 piezoelectric substrate. An accurate simulation based on the combined finite- and boundary element method (FEM/BEM) was performed in order to determine the optimum design parameters. The scaling factor ‘s’ and time delay factor ‘τ’ were extracted using signal processing techniques based on the wavelet transform of the correlation function, and then evaluated at various ambient temperatures. The scaling factor ‘s’ gave a more stable and reliable response to temperature than the time delay factor ‘τ’. Preliminary results show that the sensor response is fast and consistent subject to ambient temperature and it exhibits good linearity of 0.9992 with temperature varying from 0 to 130 °C.
Highlights
Passive and wireless sensing has attracted considerable attention in the field of detection and monitoring in harsh or inaccessible environments, such as with explosive, corrosive, high vacuum, extreme temperature and high radiation level characteristics
Passive sensors based on surface acoustic wave (SAW) technology have been reported as a favorable solution due to their low cost, small size and reproducibility [1,2]
Orthogonal frequency code (OFC) [33] and pulse modulations [35] have been reported as three typical encryption methods to encode SAW-based position [34] and phase modulations [35] have been reported as three typical encryption methods to reflective delay lines
Summary
Passive and wireless sensing has attracted considerable attention in the field of detection and monitoring in harsh or inaccessible environments, such as with explosive, corrosive, high vacuum, extreme temperature and high radiation level characteristics. The demand for miniature sensors with high sensitivity has encouraged the of the technology towards higher frequency, normally in the ISM range of 2.45 GHz. Reflective delay development of the technology towards higher frequency, normally in the ISM range of 2.45 GHz. line configurations have more advantage due to making use of the corresponding 80 MHz bandwidth. Orthogonal frequency code (OFC) [33] and pulse modulations [35] have been reported as three typical encryption methods to encode SAW-based position [34] and phase modulations [35] have been reported as three typical encryption methods to reflective delay lines. The OFC code can provide low loss and offer greater range, but suffers from encode SAW-based reflective delay lines.
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