tag 标签: detector

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  • 热度 17
    2013-12-10 16:49
    1678 次阅读|
    0 个评论
    I have a story I've been meaning to tell. When I returned home the evening before Thanksgiving, I discovered my son, Joseph, looking shell shocked. His hair was standing on end. He was panting and covered in sweat, and he gave the impression of having finished a marathon. The closest thing I can think of to give you an idea of what I'm talking about is Beaker from The Muppet Show having a bad day.   For some reason, the first thing that popped into my mind was the expression "Fire in the hole," which is commonly used to alert people that a controlled detonation is about to take place. The first cannons were fired by applying a flaming torch to a small hole packed with gunpowder. "Fire in the hole" was both a command to the man wielding the torch and a warning to anyone in the vicinity. Once Joseph had quieted down and caught his breath, he explained what had happened. The day before, my wife (Gina the Gorgeous) had mentioned that we needed to clean the oven in anticipation of her preparing our Thanksgiving repast. Since I had been broiling quite a few steaks and burgers recently, I told her she should wait for me to give it a good wipe down to remove any grease before she ran the oven's self-cleaning cycle. Did she listen to me? Ha. Why is it that no one ever listens to what I have to say? It's like casting pearls of wisdom before... creatures that don't appreciate such things. The following afternoon, while I was still at work, Gina initiated the oven's self-cleaning function and then merrily sailed out of the door on her way to the grocery store after instructing Joseph to "keep an eye on things." According to Joseph, it wasn't long before thick, black smoke started pouring out of the oven. Unfortunately, he didn't have a clue how to terminate the cycle. First, he opened the front and back doors to get a breeze blowing through the house... only to discover that it was a still and windless day. While Joseph was contemplating his next move, the smoke detector in the hallway connecting the kitchen to the garage started to sound the alarm. Being well acquainted with the ramifications of his mother's exuberant cooking techniques, Joseph immediately dragged a stool under the detector, mounted the stool, and started fanning the detector with a magazine. As soon as that detector had ceased its warbling, the one in the corridor at the other side of the family room took over. Joseph dragged his stool across the house and started fanning that little rascal. Then the detector in the master bedroom took up the call, quickly followed by the detector in Joseph's bedroom. One thing you can say about our house is that it is in no way underequipped on the smoke detector front. To cut a long story short, smoke kept on pouring out of the oven, and Joseph spent much of the next hour or so fanning one detector into submission, only to have the next one grasp the metaphorical baton and run with it. It was as if Joseph had invented a novel version of Whac-A-Mole. Suffice it to say that Joseph is no longer a fan of self-cleaning ovens.  
  • 热度 12
    2012-12-11 20:29
    1714 次阅读|
    0 个评论
    When I was about 12 years old, one of my best friends at school was a guy called Carl Clements. Carl was extremely clever and gifted – I often wonder what he ended up doing. When the other kids were kicking a soccer ball around during the breaks, Carl would be sketching out circuit diagrams in the dust with his finger, showing me how to make an amplifier using a single bipolar junction transistor and stuff like that (we knew how to have a good time :-) I remember one day when Carl brought a lie detector to school. It boasted all sorts of coils and wires and suchlike attaches to a wooden board. He would persuade people to hold the two contacts while he held the main board. Carl would start by asking their name – they would reply and nothing would happen. Then he would say "Let's make sure it's working – I'm going to ask you a question and you tell a lie." So he would ask them something like "Are you a girl?" (The chances of the person being a girl were zero because it was a boys-only school). Upon replying "Yes" to this question the boy would receive a substantial electric shock. Carl would then proceed to ask a bunch of other questions. Of course the whole thing was a spoof – Carl was triggering the shocks by hand using a hidden switch mounted under the board – he was only caught out when the victim received a shock and indignantly proclaimed "But that's true!" The reason I'm waffling on about that here is that I just saw a rather good joke. I'm sure this one is an "old chestnut" but it's the first time I've seen it: A father buys a lie detector robot that slaps people when they lie. He decides to test it out at dinner one night. The father asks his son what he did that day. The son says, "I did some schoolwork." The robot slaps the son. The son says, "Ok, Ok. I was at a friend's house watching movies." The dad asks, "What movie did you watch?" The son replies, "Toy Story." The robot slaps the son. The son says, "Ok, Ok we were watching porn." The dad says, "What? At your age I didn't even know what porn was!" The robot slaps the father. The mom laughs and says, "Well, he certainly is your son!" The robot slaps the mother! End of Story P.S. Robot for sale! In turn, this reminded me of those snippets from the Jimmy Kimmel show where he puts a fake lie detector on a kit's head – for example, take a peek at this video . Did anyone at your high-school come up with a spoof like this?  
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    Abstract:Toproducethe3-wireSPI™interfacerequiredbyaMAX7221displaycontroller(active-lowCS,DIN,andCLK),this1-Wire®networkseriallyaddressesthree1-Wireswitches(DS2413).ThefirstswitchcreatesChipSelectdirectly(active-lowCS),thesecondcreatestheserial-datalinedirectly(DIN),andthethirdswitch—withthehelpofthreeexclusive-ORgates—createstheserialclock(CLK).Maxim>Designsupport>Appnotes>1-WireDevices>APP4505Maxim>Designsupport>Appnotes>AnalogSwitchesandMultiplexers>APP4505Keywords:1-wirenetworks,1-wireswitches,SPIperipherals,edgedetector,oneshotNov11,2010APPLICATIONNOTE4505One-WireNetworkControlsRemoteSPIPeripheralsBy:MichaelPetersenAbstract:Toproducethe3-wireSPIinterfacerequiredbyaMAX7221displaycontroller(active-lowCS,DIN,andCLK),this1-Wirenetworkseriallyaddressesthree1-Wireswitches(DS2413).ThefirstswitchcreatesChipSelectdirectly(active-lowCS),thesecondcreatestheserial-datalinedirectly(DIN),andthethirdswitch―withthehe……
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    摘要:许多工业和医学应用需要±1°C甚至更高精度的温度测量,并且成本合理,可覆盖宽温范围(-270°C至+1750°C),这些系统往往还要求低功耗性能。经过正确选择和标准化处理,利用高分辨率ADC数据采集系统(DAS)和新型热电偶,能够覆盖这一温度范围,即使在恶劣的工业环境下,亦可确保精确测量。利用先进的热电偶和高分辨率Σ-ΔADC实现高精度温度测量JosephShtargot,应用工程师SohailMirza,应用经理Mar04,2012摘要:许多工业和医学应用需要±1°C甚至更高精度的温度测量,并且成本合理,可覆盖宽温范围(-270°C至+1750°C),这些系统往往还要求低功耗性能。经过正确选择和标准化处理,利用高分辨率ADC数据采集系统(DAS)和新型热电偶,能够覆盖这一温度范围,即使在恶劣的工业环境下,亦可确保精确测量。类似文章于2011年6月22日发表在EETimes杂志。引言热电偶广泛用于各种温度检测。热电偶设计的最新进展,以及新标准和算法的出现,大大扩展了工作温度范围和精度。目前,温度检测可以在-270°C至+1750°C宽范围内达到±0.1°C的精度。为充分发挥新型热电偶能力,需要高分辨率热电偶温度测量系统。能够分辨极小电压的低噪声、24位、Σ-Δ模/数转换器(ADC)非常适合这项任务。数据采集系统(DAS)采用24位ADC评估(EV)板,热电偶能够在很宽的温度范围内实现温度测量。热电偶、铂电阻温度检测器(PRTD)和ADC相结合,可构成高性能温度测量系统。采用低成本、低功耗ADC的DAS系统,可理想满足便携式检测的应用需求。热电偶入门托马斯塞贝克在1822年发现了热电偶原理。热电偶是一种简单的温度测量装置,由两种不同金属(金属1和金属2)组成(图1)。塞贝克发现不同的金属将产生不同的、与温度梯度有关的电势。如果这些金属焊接在一起构成温度传感器结(TJUNC,也称为温度结),另一端未连接的差分结(TCOLD,作为恒温参考端)上将呈现出电压,VOUT,该电压与焊接结的温度成正比。从而使热电偶输出随温度变化的电压/电荷,无需任……
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    摘要:许多工业和医学应用需要±1°C甚至更高精度的温度测量,并且成本合理,可覆盖宽温范围(-270°C至+1750°C),这些系统往往还要求低功耗性能。经过正确选择和标准化处理,利用高分辨率ADC数据采集系统(DAS)和新型热电偶,能够覆盖这一温度范围,即使在恶劣的工业环境下,亦可确保精确测量。利用先进的热电偶和高分辨率Σ-ΔADC实现高精度温度测量JosephShtargot,应用工程师SohailMirza,应用经理Mar04,2012摘要:许多工业和医学应用需要±1°C甚至更高精度的温度测量,并且成本合理,可覆盖宽温范围(-270°C至+1750°C),这些系统往往还要求低功耗性能。经过正确选择和标准化处理,利用高分辨率ADC数据采集系统(DAS)和新型热电偶,能够覆盖这一温度范围,即使在恶劣的工业环境下,亦可确保精确测量。类似文章于2011年6月22日发表在EETimes杂志。引言热电偶广泛用于各种温度检测。热电偶设计的最新进展,以及新标准和算法的出现,大大扩展了工作温度范围和精度。目前,温度检测可以在-270°C至+1750°C宽范围内达到±0.1°C的精度。为充分发挥新型热电偶能力,需要高分辨率热电偶温度测量系统。能够分辨极小电压的低噪声、24位、Σ-Δ模/数转换器(ADC)非常适合这项任务。数据采集系统(DAS)采用24位ADC评估(EV)板,热电偶能够在很宽的温度范围内实现温度测量。热电偶、铂电阻温度检测器(PRTD)和ADC相结合,可构成高性能温度测量系统。采用低成本、低功耗ADC的DAS系统,可理想满足便携式检测的应用需求。热电偶入门托马斯塞贝克在1822年发现了热电偶原理。热电偶是一种简单的温度测量装置,由两种不同金属(金属1和金属2)组成(图1)。塞贝克发现不同的金属将产生不同的、与温度梯度有关的电势。如果这些金属焊接在一起构成温度传感器结(TJUNC,也称为温度结),另一端未连接的差分结(TCOLD,作为恒温参考端)上将呈现出电压,VOUT,该电压与焊接结的温度成正比。从而使热电偶输出随温度变化的电压/电荷,无需任……
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    制器(低电平有效CS,DIN和CLK),所需的1-Wire®串行网络解决三个1线开关(DS2413的)。创建的第一个开关片选(低电平有效CS),第二直接创造的串行数据线(DIN)和第三开关与帮助独占或门产生串行时钟(CLK)。Maxim>Designsupport>Appnotes>1-WireDevices>APP4505Maxim>Designsupport>Appnotes>AnalogSwitchesandMultiplexers>APP4505Keywords:1-wirenetworks,1-wireswitches,SPIperipherals,edgedetector,oneshotNov11,2010APPLICATIONNOTE4505One-WireNetworkControlsRemoteSPIPeripheralsBy:MichaelPetersenAbstract:Toproducethe3-wireSPIinterfacerequiredbyaMAX7221displaycontroller(active-lowCS,DIN,andCLK),this1-Wirenetworkseriallyaddressesthree1-Wireswitches(DS2413).ThefirstswitchcreatesChipSelectdirectly(active-lowCS),thesecondcreatestheserial-datalinedirectly(DIN),andthethirdswitch―withthehe……
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    【应用手册】AN551:SDI-ASIAutoDetectReferenceDesignforStratixIIGXDevicesThisapplicationnotedescribestheSDI-ASIautoprotocoldetectorreferencedesignbasedonthecombinationofthecurrentAlteraSDIandASIMegaCore®functions,andshowshowtodemonstratetheSDI-ASIcomboblockwiththeStratix®IIGXaudiovideodevelopmentboard.AN551:SDI-ASIAutoDetectReferenceDesignforStratixIIGXDevicesNovember2008AN-551-1.0IntroductionThisapplicationnotedescribestheSDI-ASIautoprotocoldetectorreferencedesignbasedonthecombinationofthecurrentAlteraSDIandASIMegaCorefunctions,andshowshowtodemonstratetheSDI-ASIcomboblo……
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    :PIN光电二极管,四个低噪声运算放大器和比较器,用于探测单个光子的伽玛射线。的原理,设计考虑和选择组件进行了讨论。Maxim/Dallas>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSAUTOMOTIVEMEASUREMENTCIRCUITSKeywords:gammaray,photon,radiationdetector,lownoiseopamp,PIN,photodiode,gammaradiation,Jul21,2003operationamplifiers,opamps,comparatorAPPLICATIONNOTE2236Gamma-PhotonRadiationDetectorAPINphotodiode,fourlow-noiseopampsandacomparatorareusedtodetectindividualphotonsofgammaradiation.Theschematic,designconsiderationsandcomponentselectionarediscussed.ThecircuitofFigure1includesaPINphotodiodethatdetectsindividualphotonsofgammaradiation.Whenaphotonstrikesadepletionregioncreatedbyreversebiasonthephotodiode,itproducesasmallamountofchargeinproportiontothephoton'senergy.Theresultingsignalisthen……
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    时间: 2019-12-24 19:29
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    时间: 2019-12-24 18:41
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    摘要:这个设计理念显示电压检测器、MAX8211和电荷泵逆变器、MAX680,窗体load-disconnect开关切换。此load-detect开关使用仅8µA,并将暂停从深放电保护可充电电池的电池放电。Maxim>AppNotes>BatteryManagementKeywords:voltagemonitor,voltagedetector,voltageconverter,charge-pumpinverter,voltagetriplerJul09,1998APPLICATIONNOTE968Load-DisconnectSwitchHaltsBatteryDischargetoProtectRechargeableBatteriesAbstract:Thisdesignideashowsavoltagedetector,theMAX8211,andchargepumpinverter,theMAX680,thatformaload-disconnectswitch.Thisload-detectswitchusesonly8Aandhaltsbatterydischargetoprotectrechargeablebatteriesfromdeepdischarge.Deepdischargecandamagearechargeablebattery.TheFigure1circuit,bydisconnectingthebatteryfromitsload,haltsbatterydischargeatapredeterminedlevelofdecliningterminalvoltage.TransistorQ1actsastheswitch.……
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    时间: 2019-12-24 18:04
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    摘要:这种电路使用数字电位器(罐)和比较器,功能不正常与传统上被用整流器和示例搁置(S/H)的峰值探测器相关联的droopless操作。Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSDIGITALPOTENTIOMETERSKeywords:peakdetector,sampleandhold,comparators,digitalpotentiometers,pots,zerodroop,drooplessJan26,2001APPLICATIONNOTE1163InexpensivePeakDetectorFeaturesDrooplessOperationAbstract:Thiscircuit,whichusesadigitalpotentiometer(pot)andacomparator,featuresdrooplessoperationthatisnotnormallyassociatedwithpeakdetectorsthathavetraditionallyusedrectifiersandsample-and-holds(S/H).Mostpeakdetectorsemployarectifierandasample-and-holdcircuit,whichispronetooutputdroop.Inanalternativeapproach,showninthefigurebelow,a5-bitdigitalpotentiometerwithaservoloopisusedtocreateaninexpensivepeakdetectorwithalogic-levelreset……
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    时间: 2019-12-24 17:06
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    上传者: rdg1993
    摘要:通过解释法拉第定律启动此应用程序说明。注释然后显示如何电压表和连接导线作为一个位置传感器。一轨到轨I/O比较器和几个简单组件构成比较直流电压正弦波振幅的振幅探测器。MAX985轨到轨I/O运算放大器的特点是在设计中。Maxim>AppNotes>GeneralengineeringtopicsMeasurementcircuitsMiscellaneouscircuitsKeywords:Faraday'sLaw,voltmeter,positionsensor,amplitudedetector,sinewaveamplitudeSep22,2003APPLICATIONNOTE2238PositionsensorexploitsFaraday'sLawAbstract:ThisapplicationnotestartsbyexplainingFaraday'sLaw.Thenotethenshowshowavoltmeterandconnectingwiresserveasapositionalsensor.Arail-to-railI/OcomparatorandafewsimplecomponentsformanamplitudedetectorthatcomparesthesinewaveamplitudewithaDCvoltage.TheMAX985rail-to-railI/Oopampisfeaturedinthedesign.ConsidertworesistorsR1(1kΩ)andR2(3kΩ),connectedinparallelasshowninFigure1.Atime-varyingmagneticfieldH,increasinglinearlywithtime,……