NASAPostponesShuttleAtlantisLaunch,AimsforSaturdayNASAhasdelayedFriday'slaunchofSpaceShuttleAtlantisonitsSTS-115missiontotheInternationalSpaceStation.Lift-offnowissetfor11:15a.m.EDTSaturdayShuttleprogrammanagers decidedtopostponeAtlantis'launchat 10:52a.m.EDTFridayduetoanissuewithafuelcut-offsensorsysteminsidetheexternalfueltank.This is one of several systemsthatprotectthe shuttle'smainenginesby triggering their shut down if fuel runs unexpectedly low.During countdownactivitiesFridaymorninga sensorinsidetheexternaltankfailedaroutinepre-launchcheck.Theenginecut-off,orEcOsensor,is oneoffourinsidetheliquidhydrogensectionofthetank.The tank's liquid oxygen and liquid hydrogen will be drained Friday.While the tank isemptied,engineers will monitor and collect data on the liquid hydrogen sensors NAsA'slaunchruleshave a preplanned procedurethat states if a singleEcO sensorfailsengineers need to drain thetank and verify all the sensors are working as they go dry.lfthe sensors and system work as expected,Atlantis willbe cleared to launch withthreeoffourworking sensorsSaturday.Thereloadingof theexternal tankissetfor1:15a.mEDTSaturday.ZUST阮spruan@122009年9月
2009年9月 ZUST 阮 spruan@126.com 2 NASA Postpones Shuttle Atlantis Launch, Aims for Saturday NASA has delayed Friday's launch of Space Shuttle Atlantis on its STS-115 mission to the International Space Station. Lift-off now is set for 11:15 a.m. EDT Saturday. Shuttle program managers decided to postpone Atlantis' launch at 10:52 a.m. EDT Friday due to an issue with a fuel cut-off sensor system inside the external fuel tank. This is one of several systems that protect the shuttle's main engines by triggering their shut down if fuel runs unexpectedly low. During countdown activities Friday morning a sensor inside the external tank failed a routine prelaunch check. The engine cut-off, or ECO sensor, is one of four inside the liquid hydrogen section of the tank. The tank's liquid oxygen and liquid hydrogen will be drained Friday. While the tank is emptied, engineers will monitor and collect data on the liquid hydrogen sensors. NASA's launch rules have a preplanned procedure that states if a single ECO sensor fails, engineers need to drain the tank and verify all the sensors are working as they go dry. If the sensors and system work as expected, Atlantis will be cleared to launch with three of four working sensors Saturday. The reloading of the external tank is set for 1:15 a.m. EDT Saturday
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参考书籍：何道清.传感器与传感器技术科学出版社张洪润.传感技术与应教程清华大学出版社孟立凡.传感器原理及技术国防工业出版社王雪文.传感器原理及应用北京航空航天大学出版社王元庆.新型传感器原理及应用机械出版社52009年9月ZUST阮 spruan@126.com
2009年9月 ZUST 阮 spruan@126.com 5 参考书籍： • 何道清. 传感器与传感器技术. 科学出版社 • 张洪润. 传感技术与应教程 清华大学出版社 • 孟立凡. 传感器原理及技术. 国防工业出版社 • 王雪文. 传感器原理及应用. 北京航空航天大学出版社 • 王元庆. 新型传感器原理及应用. 机械出版社
绪论传感器的地位和作用$ 0.1例1 人与机器的机能对应关系定性人通过感官感觉外界对象的刺激，通过大脑对感受的信息进行判断、处理，肢体作出相应的反映定量传感器相当于人的感官，称“电五官”，外界信息由它提取，并转换为系统易于处理的电信号，微机对电信号进行处理，发出控制信号给执行器，执行器对外界对象进行控制62009年9月ZUST阮 spruan@126.com
2009年9月 ZUST 阮 spruan@126.com 6 绪 论 §0.1 传感器的地位和作用 例1 人与机器的机能对应关系 定性 人通过感官感觉外界对象的刺激，通过大脑对感 受的信息进行判断、处理，肢体作出相应的反映。 定量 传感器相当于人的感官，称“电五官”，外界信 息由它提取，并转换为系统易于处理的电信号，微 机对电信号进行处理，发出控制信号给执行器，执 行器对外界对象进行控制