Force sensor : Tactile, Hearing
By embedding sub-micro meter thick silicon piezoresistor in silicone rubber, we fabricated highly sensitive, micro size and multi axis force sensor. Since the sensitivity of silicon piezoresistor is tens of times higher than metal strain gauge, it can detect small force such as slippage. We are researching on motion control of robots and analysis of the activities of human and other animals using this sensor.
Current Research：Motion control of robot-hand using multi-axis force plate
We are researching on a multi-axis force plate type sensor to control the force/motion of a robot-hand. The sensor is composed of force sensor chips attached on a stiff plate. The sensor chips are used to measure the distribution of the force applied on to the stiff plate surface. We are considering to control the motion of Prof. Donmas robot which is the mascot of our university.
Current Research: Squat motion analysis using muscle sound measurement system
When muscle deforms, they cause sound. This effect is called muscle sound. Muscle sound is one of the indicator of the muscle activity. To detect the relationship between this muscle sound and the force caused by the human motion, we fabricated the system which measures the sound from thigh muscle and the force distribution of the foot sole simultaneously.
Current Research: Vibration sensor using ER fluid to measure processing
Whenever we cut/drill object with processing machine, several types vibration of wide range frequency will occur. These vibrations are caused because of the cutting/drilling method and/or the wear of the tools. Additionally, it is well known that small ultrasonic vibration will occur inside the tool before it breaks, which called acoustic emission signal. We may increase the processing accuracy by detecting the machine status from these vibrations and controlling the machine. To detect this wide range vibration, we are researching on a vibration sensor which detects the surface tension wave of ER (Electro Rheological) fluid with silicon piezoresistor. Because the viscosity of the ER fluid can be controlled by applying electrical field, the sensor can focus on and detect target frequency with highly sensitivity.