Browsing by Author "Morais, R."
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- Bioimplantable impedance and temperature monitor low power micro-system suitable for estrus detectionPublication . Miranda, N.; Morais, R.; Dias, M.; Viegas, C.; Silva, F.; Serôdio, C.; Almeida, J.; Azevedo, J.; Reis, M.C.Based on cyclic physiologic animal bioimpedance and body temperature a new method is being evaluated to predict estrus in dairy cattle with the aim of improving artificial insemination efficiency. Preceding in-vivo tests are being performed with a dedicated system based on the impedance converter AD5933, and a two-electrode configuration bioimplantable capsule. Acquired results will allow the optimal design of an implantable and autonomous low-power system. The implantable microsystem is being designed and simulated employing low-power techniques in a 0.35μm CMOS standard process.
- A novel monolithic silicon sensor for measuring acceleration, pressure and temperature on a shock absorberPublication . Ferreira, C.; Ventura, P.; Grinde, C.; Morais, R.; Valente, A.; Neves, C.; Reis, M.J.C.S.; Henriques Ferreira, Carlos Daniel; Neves, CarlosA fabricated micro-mechanical sensor to assess the condition of automotive shock absorbers is presented. The monolithic sensor, measures the oil temperature, acceleration and internal pressure of the shock absorber. A dual mass accelerometer with optimized beam geometry is used for acceleration readout. In addition, a 23.1 μm thickness square membrane and two buried resistors are used for pressure and temperature sensing respectively. The proposed miniaturized sensor can be effectively integrated with standard single- and dual-tube shock absorbers. The data acquired during normal vehicle operation can be continuously used to monitor the condition of the shock absorbers, allowing shock absorbers to be replaced before their degradation significantly reduce the comfort, performance and safety of the vehicle.