University of North Texas Background
Self-powered sensors that need no maintenance and can gather data for days to weeks are presently unavailable for many applications that do not have regular access to solar energy or wireless power transfer. This technique will enable the development of self-powered devices capable of long-term motion detection, which would be beneficial for monitoring elderly patients recuperating from surgical operations such as joint replacement. The self-powered motion sensor will be fueled externally by gathered kinetic motion and will be capable of long-term operation. Previously, no wireless sensor capable of gathering low-frequency kinetic energy has been proven.
A wearable motion sensor gadget that does not need the use of an external power source to function. The motion sensor gadget is comprised of a motion sensor that collects data about movement. In addition, the motion sensor gadget features a reverse-electrowetting on dieREWODlectric technology (REWOD) when worn, an alternating current (AC) generator that creates alternating current (AC) in response to human movements is generated.
A motion sensor transmitter circuit is also included in the sensor device. The transmitter circuit for the motion sensor comprises an amplifier to amplify the motion data, as well as an analog to digital converter (ADC) to transform the motion data to a digital format. The conversion of motion data into a digital format, as well as a transmitter for transmitting the motion data, the motion sensor is a device that detects movement.
In addition, the transmitter circuit contains a rectifier and a voltage regulator to convert the alternating current voltage and current from the REWOD generator into direct current (DC) power to power-up the amplifier, the ADC, and the other devices transmitter. In this manner, the motion sensor may work and wirelessly communicate motion data dependent on the movement of the object relying exclusively on the energy provided by the wearer’s movement.
REWOD operates at lower frequency range (~0.25 – 10Hz) with higher efficiency.
Suitable for human health data monitoring and sensing.
Comparatively REWOD has potential for generating 50 times more power at lower frequencies.
REWOD systems can be designed with flexible electrodes such as CNT- Buckypaper.
REWOD can theoretically produce over an order of magnitude more power at driving frequency (<10 Hz). Input energy can be omnidirectional unlike many other energy harvesters such as cantilevered bean EH. Applications The proposed technology is well suited in application towards health care devices – including smart devices to monitor health factors and fitness.