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The present study describes the MEMS-based piezoelectric switch to activate the event-driven wireless sensor node for chicken health monitoring system. We have fabricated the switch composed of “S” shaped piezoelectric cantilever and proof mass, where the resonance is 24 Hz. When the switch has been vibrated at 4, 6, 8, and 12 Hz, which is close to the chicken movement frequency, the input vibration...
Ultra wideband (UWB) communication was evaluated within a closed space, with a view to partly replacing onboard data buses with wireless connections. Spatial distributions of UWB propagation in frequency (from 3.1 to 10.6 GHz), time domains and throughput with use of a radio absorber were derived from measured. It was also found that delay spreads can be suppressed by partially panelling a radio absorber...
Ultra wideband (UWB) transmission was evaluated within a small scientific spacecraft, with a view to partly replacing onboard data buses with wireless connections. Spatial distributions of UWB link throughput were derived from measurements. The results revealed that commercially-available UWB devices were capable of accommodating up to around 90-Mb/s data buses within spacecrafts.
Ultra wideband (UWB) propagation was measured and characterized within spacecrafts, with a view to partly replacing onboard data buses with wireless connections. Spatial distributions of UWB and narrowband propagation in frequency (from 3.1 to 10.6 GHz) and time domains were measured with a microwave vector network analyzer. While narrowband resulted in a number of dead spots (deep fading points)...
This paper shows channel models on path loss and power delay profile for wireless body area networks. These models were derived from measured channel transfer functions by using a vector network analyzer. The path loss models were obtained for the frequency bands of 430, 611, 953, 2450 MHz, and UWB band. A power delay profile model was given only for the UWB band because typical symbol duration of...
We have developed the digital output piezoelectric accelerometer using CMOS-compatible AlN thin films. The AlN thin films were deposited by sputtering. The multilayer of Pt/Ti/AlN/Pt/Ti/SiO2 has been fabricated into the piezoelectric accelerometers, where the patterned AlN thin films are arrayed in parallel and electrically connected in series. The sensitivity of the fabricated accelerometer reaches...
We have developed a novel piezoelectric accelerometer with digital output for ultra-low power wireless sensor nodes. The accelerometer is composed of an array of piezoelectric parallel-plate capacitor structures that are joined together in series and connected to a CMOS switch array. This composition makes it possible to realize a digital output accelerometer in which the number of on-state CMOS switches...
This paper reports the preliminary experiments on the cow identification via gait recognition of motion images. The eight cows walking under two different situations have been precisely identified by Cubic Higher-order Local Auto-Correlation (CHLAC). The cow gait recognition using CHLAC is expected to be a landmark achievement for realizing cost-effective dairy cattle breeding management systems which...
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