Browsing by Author "Jayathilaka, WADM"

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Design and Simulation of a MEMS Based Dual Axis Capacitive Accelerometer
(2015-08-03) Jayanetti, VC; Jayathilaka, WADM; Talawatta, KI; Amarasinghe, YWR
Micro Electro Mechanical Systems (MEMS) based multi axis accelerometers are embedded in many modern technological applications. These sensors are widely used in smart electronics, bio-medical uses, automobiles and aeronautics. The work followed herewith is focused on designing of a 2 degree of freedom (D.O.F) MEMS based capacitive accelerometer which can be used with such vibration detection modules. The 2mm x 2mm x 100μm sensor has a working range of up to ±16g and a failure limit of 20g The movement of a proof mass which is 74.5% of the sensor area is used to generate amplified voltage signals based on the theory of capacitance using a series of capacitive comb elements mounted on the perimeter of the sensor. Process simplification is achieved with the use of a single Silicon-on- Insulation (SOI) wafer and minimum masking material. The paper contains details on structural and motion analysis performed on the design and also contains techniques which can be used for the fabrication of the sensor and electrical contacts needed for the successful implementation of the sensor into electrical circuitry.
item: Conference-Full-text
Design and simulation of mems based 5-dof tactile force sensor
(IEEE, 2016-04) Udayanga, TDI; Jayathilaka, WADM; Amarasinghe, YWR; Dao, DV; Jayasekara, AGBP; Bandara, HMND; Amarasinghe, YWR
This paper describes design and simulation of five degrees of freedom (5-DOF) Micro-Electro-Mechanical systems (MEMS) based tactile force sensor. Tactile sensing involves with measuring physical parameters such as force, temperature, etc. with the aid of physical touch. Over the past decades tactile sensors are gaining popularity over non-contact sensors in biomedical and robotic applications. Proposed sensor design with 3mm x 3mm x 300μm dimensions, has the capability to measure not only the magnitude but also the direction of the force applied. A wagon wheel spring structure was proposed, where 8 beams work as springs to relief the force applied. Behavior of these 8 beams are monitored under each loading conditions using defused piezoresistive sensing elements. A finite element analysis of structure was performed to optimize and validate the structure and Multiphysics analysis was performed to validate the working principal of the proposed sensor.
item: Conference-Full-text
A novel mems motor based on thermal actuation
(IEEE, 2016-04) De Silva, AHTE; De Silva, DDN; Perera, KDCJ; Priyashantha, AMB; Sampath, LLR; Darshan, P; Jayathilaka, WADM; Amarasinghe, YWR; Jayasekara, AGBP; Bandara, HMND; Amarasinghe, YWR
It is essential for the Micro Electro Mechanical Systems (MEMS) research industry to introduce novel concepts of micro motors to overcome problems in existing micro motors. This paper propose a novel concept of a micro motor using kink actuators and reciprocating rack and pinion assembly. Design details of the reciprocating rack and pinion is discussed in the paper. A detailed analysis of structural, transient, thermal, electrical properties was performed using the COMSOL software is also discussed. Finally a fabrication method is purposed using electron beam lithography and ultraviolet lithography.
item: Conference-Full-text
Smart solar tracking and on-site photovoltic efficiency measurement system
(IEEE, 2016-04) Basnayake, BADJCK; Jayathilaka, WADM; Amarasinghe, YWR; Attalage, RA; Jayasekara, AGBP; Jayasekara, AGBP; Bandara, HMND; Amarasinghe, YWR
On-site photovoltaic efficiency data is a valuable asset during a process of predicting photovoltaic potential. Not just the solar power output, but also the ambient conditions and panel temperature should be measured for a better and convinced results. Due to the unavailability of on-site data, erroneous conclusions have been made after various prediction methods. Smart solar tracking and on-site photovoltaic measurement system is proposed as a novel tool to be used in solar potential predictions which can measure and log on-site solar data. This device is capable of measuring and logging available solar power together with ambient measurements such as light intensity level, ambient temperature and humidity level and panel temperature. Measured data will then be stored in an internal memory card and will be available at any moment. Integrated wireless communication module will enable remote log-in and control of the device. Computer based Graphical User Interface (GUI) software application enables the remote access to the gathered data and optimization of its operation.