Sensors

2.8. Optical ring resonator based sensor performance metrics To compare different kinds of optical RR based sensors, it is necessary to define some performance metrics. The suitability of optical sensors for a particular application will depend on their performance across number of sensor requirements. Some metrics such as sensitivity, and sensor cost, can be defined numerically (either by means of experimental or theoretical calculations). Other metrics such as portability is more subjective or

Capacitive sensors use an array capacitor plates to image the fingerprint. Skin is conductive enough to provide a capacitive coupling with an individual capacitive element on the array. Ridges, being closer to the detector, have a higher capacitance and valleys have a lower capacitance. Some capacitive sensors apply a small voltage to the finger to enhance the signal and create better image contrast. Capacitive sensors can be sensitive to electrostatic discharge (shock) but they are insensitive

Introduction A sensor is a hardware device that provides information to the computer about the location, temperature, pressure etc. by converting physical quantity into digital measures. Programs on computer are installed to fetch and access information from sensors and then store it for analysis. There are two types of sensors: The one that are built into computer and the others that are connected to computer via wired or wireless medium. Industries are investing in sensors for various sectors like

Medical Sensor Networks have unique constrictions as compared to conventional networks making the execution of security measures impractical. Medical Sensor Networks aspire to develop the breathing healthcare and monitoring services, particularly for the aged people, kids and persistently ill. There are numerous advantages accomplished with Medical Sensor Networks. To commence with, remote monitoring potential is the foremost advantage of MSN. With remote monitoring, the recognition of urgent situations

Capacitive Sensors Capacitive sensors use an array capacitor plates to image the fingerprint. Skin is conductive enough to provide a capacitive coupling with an individual capacitive element on the array. Ridges, being closer to the detector, have a higher capacitance and valleys have a lower capacitance. Some capacitive sensors apply a small voltage to the finger to enhance the signal and create better image contrast. Capacitive sensors can be sensitive to electrostatic discharge (shock) but they

Wireless Network Sensors (WSNs) [4] has offered a lot of Intelligent Systems which require minimum expenditure with least labor services. WSNs works entirely on sensors which sense physical as well as environmental conditions such as temperature, sound, pressure, noise etc. We have come along with lots and lots of services in Industrial monitoring, health care monitoring, and environmental monitoring using WSNs. I came across an interesting journal of Intelligent Parking Lot Application using Wireless

connection of solar module and sensor parameter. The temperature of the solar sense by temperature sensor LM35. The temperature of the solar can also be used with humidity sensor which it can sense the both humidity and temperature of solar surrounding. The LDR act as an irradiance meter to detect the light intensity from the solar panel. However, the irradiance meter is impossible to perform in this project because of its higher cost. The variable resistor act as voltage sensor in order to monitor solar

INDEX 1. INTRODUCTION 1 1.1 Wireless sensors Deployment 2 1.2 Wireless Sensor and Actor Networks 3 1.3 The Physical Architecture of WSANs 3 1.4 Difference between WSNS and WS 4 1.5 Requirement of WSNs 5 2. Wireless Ad-Hoc Network 5 3. Current Issues and solution 6 3.1 Key management issue for future

Introduction Background A wireless sensor network (WSN) consists of distributed sensors to monitor environmental conditions such as temperature, sound, vibration, pressure, motion or detect dimensions, to pass their data through the network to a base station for processing. Advantages of WSN over a wired system considered in elimination of wiring cost, sensors can be installed in harsh environments. Each sensor node is a combination of Radio transceiver with an internal antenna or connection

Wireless sensor networks typically consist of a large number of sensor nodes with limited onboard battery resources which are difficult to recharge or replace. Thus the reduction of energy consumption for end-to-end data rate and maximization of network lifetime have become chief research concern. In recent years, many techniques have been proposed for improving the energy efficiency in wireless sensor networks. Among these techniques, V-MIMO technique has been considered as one of the effective