烟气探头是怎么工作地howsmokedetectorwork

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1、实用标准HowSmokeDetectorsWorkInsidethisArticle1.IntroductiontoHowSmokeDetectorsWork2.PhotoelectricDetectors3.IonizationDetectors:IonizingRadiation4.IonizationDetectors:IonizationChamber5.InsideanIonizationSmokeDetector6.LotsMoreInformationSmokedetectorsareoneofthoseamazinginventi

2、onsthat,becauseofmassproduction,costpracticallynothing.Youcangetasmokedetectorforaslittleas$7.Andwhiletheycostverylittle,smokedetectorssavethousandsofliveseachyear.Infact,itisrecommendedthateveryhomehaveonesmokedetectorperfloor.Allsmokedetectorsconsistoftwobasicparts:asensort

3、osensethesmokeandaveryloudelectronichorntowakepeopleup.Smokedetectorscanrunoffofa9-voltbatteryor120-volthousecurrent.Inthisarticle,wewillexaminethetwomostcommontypesofsmokedetectorsusedtoday:photoelectricdetectorsandionizationdetectors.And,we'llalsotakealookinsideanionizationd

4、etector.Let'sstartwithphotoelectricdetectors.PhotoelectricDetectorsDidYouKnow?FiresensorsweredevelopedfromtechnologyNASAusestoenhancephotosofdistantplanets.LearnmoreaboutcoolNASAinnovationsinthisinteractiveanimationfromDiscoveryChannel.Occasionally,youwillwalkintoastoreandabel

5、lwillgooffasyoucrossthethreshold.Ifyoulook,youwilloftennoticethataphotobeamdetectorisbeingused.Nearthedoorononesideofthestoreisalight(eitherawhitelightandalensoralow-powerlaser),andontheothersideisaphotodetectorthatcan"see"thelight.精彩文档实用标准Whenyoucrossthebeamoflight,youblockit

6、.Thephotodetectorsensesthelackoflightandtriggersabell.Youcanimaginehowthissametypeofsensorcouldactasasmokedetector.Ifitevergotsmokyenoughinthestoretoblockthelightbeamsufficiently,thebellwouldgooff.Buttherearetwoproblemshere:1.It'saprettybigsmokedetector.2.Itisnotverysensitive.

7、TherewouldhavetobeaLOTofsmokebeforethealarmwouldgooff--thesmokewouldhavetobethickenoughtocompletelyblockoutthelight.Ittakesquiteabitofsmoketodothat.Photoelectricsmokedetectorsthereforeuselightinadifferentway.Insidethesmokedetectorthereisalightandasensor,buttheyarepositionedat9

8、0-degreeanglestooneanother,likethis:Inthenormalcase,thelightf