Developing Sensor Technology

Developing Sensor Technology

Abstract

The need for sensor devices has been growing to develop new applications in several technological fields The current stateoftheart of this sensor technology used in modern electronic nose designs to operate in a different manner The chamber of the ENose sensor is to be upgraded mainly for reducing the nuisance alarms and to improve reliability to detect smoke which is caused by fire and nonfire particles This paper gives a brief state of the art of different fire and nonfire particles that emits smoke and various chemical gas sensors used to detect smoke and a fire detection algorithm

Keywords Sensors Smoke ElectronicNoses Fire Detection Algorithm fire particles nonfire particles

Introduction

The conception of an electronic nose could appear sort on an uptodate technology Scientists initial developed a synthetic nose within the 1930s that used sensors to measure levels of ultraviolet light found in mercury Currently these devices are employed in numerous technological fields for various applications

Presently these devices used as trendy fireplace detection frameworks for the simultaneous estimations of carbon monoxide gas CO carbon dioxide CO2 and smoke The concentration of the rates of CO and CO2 in smoke offers a path to cut back the frequency of nuisance alarms so as to extend the reliability of smoke detectors The sensors that square measures incorporated during this fireplace sighting system at the side of fire detection algorithmic rule detect smoke that is caused by fire or nonfire particles and alarmed accordingly

Previous fire detection systems used sensors for measuring temperature smoke and combustion products which include oxygen O2 carbon monoxide CO carbon dioxide CO2 water vapor H2O hydrogen cyanide HCN acetylene C2H2 and nitric oxide NO but they does not give any reliable results Some used Gas Chromatography Mass Spectrometry GCMS along with Fourier Transform Infrared FTIR Spectroscopy analyzed smoke 1

Advances in fire detection systems are being sought to decrease the detection time and the frequency of unnecessary alarms Most of the research works done with the MultiSensor Detectors for accomplishing these goals because there may have some trouble in using smoke detectors with a single sensor to discriminate the smoke produced from fire and nonfire sources The 95 frequency of unnecessary alarms reported by smoke detectors during the 1980s in the US is due to that limitation

Section 1 briefly introduces the Fire Detection System incorporated in an ElectronicNose and different Gas Sensors that detects smoke in Section 2 Later section 3 gives a brief description about the Fire and NonFire Particles and how the sensory system is designed in an ENose for preventing Fire accidents in section 4 Finally we concluded in Section 5

Chemical Gas Sensors

The environment needs to be monitored 2 time to time as many accidents took place lack of it So in order to control the Industrial Process Chemical Sensing Technologies has been emerging out to mainly emphasize on

Control of combustion processes oxygen

Flammable gases in order to protect against Fire Explosion

Toxic gases for environmental monitoring

Solid Electrolyte Sensor

SE sensor 3 4 is based on the principle of electrochemical gas detection which is used to detect chemicals or gases that can be oxidized or reduced in chemical reactions

It mainly contains three electrodes

A sensing or working electrode which reacts when gas is available by either oxidizing or reducing the target gas

A counter electrode which provides a comparing converse response to that occurring at the sensing electrode so as to provide a net current stream

A reference electrode that stays unaffected by the chemical reactions occurring on the sensing and counter electrodes and provides a stable potential against which measurements are frequently created



Figure 1 Solid Electrolyte Sensor

SEC sensors Figure 1 used in millio

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