The anatomy of a tooth was the inspiration for this tactile sensor study. The sensor consisted of a pole that was fixed in the middle of an acrylic base using a viscoelastic silicone elastomer. Four strain gauges were fixed three-dimensionally around the pole to detect its movement, which was formed in a single step in the assembly. When the load was applied to the side of the pole, the strain gauges were bent or released, depending on the direction of the applied load and the position of the strain gauges. The sensor device had the sensitivity of 0.016 mm−1 and 0.313 N−1 against the resistance change ratio. For the load detection experiment, a consistent pattern of full sine-curve, with a constant resistance change for the angles, was obtained for all of the four strain gauges, which confirmed the reliability of the sensor device to detect the direction of applied load. The amplitudes of the resistance change ratio remained to be consistent after loading-unloading processes at the frequency of 0.05–0.25 Hz.
In this research, a cylindrical tactile sensor was developed inspired by the anatomy of a tooth. The sensor was made using two rods; one was plugged into the other, just like a tooth that is plugged into alveolar bone. A piezoresistive conductive polymer composite was used to hold the inner rod to the outer rod, as well as to detect pressure application to the sensor. Pressure was applied to the tip and the sides of the sensor device, and at the same time, the resistances from the conductive polymer composite were measured through all the six-pair electrode combinations. When pressure was applied to the tip of the device, the decrease in the ratios of the resistance change can be observed from all six-pair combination of the electrodes. Applying pressure from the side in between two electrodes caused the ratio of resistance change at the compressed side to be decreased, but increased at the tension side. The same pattern can be observed when pressure was applied at the side that has an electrode. The position of the applied pressure can be determined by observing the pattern of resistance change in between all pairs of electrode combinations.
jp "'KeioUniversity Flexible and highly-sensitive capacitive sensors that are capable of deteeting pressure distribution on curved surfaces are on demand these days, Using solid dielectric material could deteriorate the sensors flexibilitM while using air as the dielecnic might compromise the sensors sensitivity, EM) propose a distributed capacitive sensor encapsulated in liquid that has high permittivity constant, namelM DI water and glycerin, as the dielectric. Tliis design can increase the sens{tivity while maintaining the flexibility of the sensors. The proposed sensor was micro-fabricated and proven te maintain its flexibility while being deforrned. The sensitivity enhancement of the device is te be demonstrated by comparing some charaeteristies ef the devices; between that with and without liquid encapsulated.The experiment results shewed that the devices with liquids encapsulated were more sensitive when higher pressure is applied, and arrrplification rat{os of the devices with DI water and glycerin increased ± 7 and ± 3.5 times respectively, as compared te the device without the liquid encapsulated.
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