Advantages And Disadvantages Of Piezoelectric Sensor

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Piezoelectric sensor: A piezoelectric sensor is a device that uses the piezoelectric effect to measure pressure, acceleration, strain or force by converting them to an electrical signal. As seen in Figure 1, the unit cell contains a small positively charges particle in the centre. When a stress is applied this particle becomes shifted in one direction which creates a charge distribution, and subsequent electric field. These materials come in several different forms. The most common is crystals, but they are also found as plastics and ceramics. Piezoelectric sensors have proven to be versatile tools for the measurement of various processes. They are used for quality assurance, process control and for research and development in many different…show more content…
A static force will result in a fixed amount of charges on the piezoelectric material. OPERATION Once the System has been implemented completely then next task is to observe how system is supposed to operate to carry out different operations involved in System. When vehicle will cross the sensor which are fixed at some meter distance from processing unit, Tag will read by RFID Reader. Sensor may fixed vertically at both sides or at the centre of road depend upon where the TAG is mounted on vehicle. TAG contains unique identification number. Then data read by the RFID reader will be taken by Microcontroller (8051) which will process the data for authentication of authorized user. DETAILED OF PROCESSES WORKING SIMULTANEOUSLY If valid user then data will send to processing unit which then check the respective account of that user from database to ensure weather user have sufficient amount for toll payment or not. If amount is not sufficient to pay toll then user must have to recharge its account by paying manually. If sufficient amount then user is allow to pass by iron bar which will rise up with the help mechanical assembly after receiving the permission signal from processing unit. If user is not valid then iron bar will remain down and appropriate action will be taken against invalid…show more content…
Total cost of that road. 2. The duration of toll plaza. 3. And the remaining balances after each transaction. REFERENCES 1. Manish Buhptani, Shahram Moradpour, "RFID Field Guide -Developing Radio Frequency Identification Systems", Prentice Hall, 2005, pp 7-9, 16-225, 160, 231. 2. Sewon Oh, Joosang Park, Yongioon Lee, "RFID-based Middleware System for Automatic Identification", IEEE International Conference on Service Operations and Logistics, and Information, 2005. 3. Shi-Cho Cha Kuan-Ju Huang Hsiang-Meng Chang, " An Efficient and Flexible Way to Protect Privacy in RFID Environment with Licenses ", IEEE International Conference RFID, April 16-17,2008. 4. Raj Bridgelall, Senior Member, IEEE, " Introducing a Microwireless architecture for Business Activity Sensing ", IEEE International Conference RFID, April 16-17,2008 5. Rahman, Rohisyam (2007-07-23). "Case Study: Malaysian Smart Shelf".

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