CNT based integrated temperature, gas, and pressure sensor wireless system
Abstract
Smart nanotechnology materials have been recently utilized in sensing applications. Carbon nanotube (CNT) based SoC sensor systems oer potential applications in various elds, including medical, energy, consumer electronics, computers, HVAC (heating, ventilation, and air conditioning) among others. In this study, a nanotechnology multisensory system was designed and simulated using Labview Software. The mathematical model was developed for sensing three physical quantities: temperature, gas and pressure. Four CNT groups on a chip (Two for gas sensor, one each for temperature and pressure sensor) were utilized in order to perform sensing multiple parameters. The proposed fabrication processes and the material used were to avoid the interference of these parameters (temperature, gas and pressure) on each other when detecting one of them. The simulation results were translated into analog voltage from Labview software, transmitted via Bluetooth technology, and received on desktop computers within the vicinity of the sensor system. The shielding materials used in the design are available and have been used elsewhere. The sensing ability of the CNT materials were based on the change in the conductivity of the materials, and accordingly, the resistance of the CNT layers. The size of the CNTs may also impact the electrical properties of the sensing system. The mathematical models and simulation results showed as high as 95% accuracy in measuring temperature, and the 5% error was caused from the interference of the surrounding gas. Within 7% change in pressure was impacted by both temperature and gas interference. The thesis detailed the design of the sensor system and the hardware/software wireless network used to demonstrate the validity of the design. The system was designed to emulate medical settings, where sensing occurrences from targeted subunits can be monitored by a control unit elsewhere. The Beagle Bone Black board from Texas Instruments was used as a controller and interface device to the Bluetooth chip, which allowed the system to remotely transmit the temperature, gas and pressure data to a computer within the prescribed network.
Degree
M.S.E.C.E.
Advisors
Rizkalla, Purdue University.
Subject Area
Electrical engineering
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