Newtechnologythatcan“see”throughclothinganddetectwhat’sunderneathcannowbeusedtoscancrowdsmakingitapotentiallyeffectivetooltopreventterroristattacksinpublicplaces.
TheThruVisionT5000camerapicksupTerahertzrays，orT-rayswhicharenaturallysentoutbyallobjectsandcanpassthroughclothesorevenwalls.Thecameracanthendetectmetallicandnonmetallicobjectshiddenunderclothingonstillormovingsubjectswithoutshowinganybodydetail.
WhilesimilartechnologyisseenatairportsaroundtheworldtheT5000isdesignedtobeusedinlargeopenareas.Witharangeof25meterstheT5000canscreenpeopleinpublicplacesthusavoidingbottle-necksatbordercrossingorsecuritycheckpoints.Italsomeanspeoplecanbescreenedwithoutknowingit.
ThetechnologydevelopsfromBritishastronomers’workinstudyingdyingstars.AstronomersuseT-raycamerastoseethroughdustandcloudsinspace.Thecompanyseesusesforitscameraatothersiteswherepoliticalorbusinessactivitiestakeplace.
Forprivacyconcerns，ThruVisionChiefExecutiveCliveBeattiesaidtheimageproducedbythecameradidnotshowdetailedpartsofthebody.”It'salmostashininglightbulb(灯泡）.“Beattiesaid."Youdon'tseethedetailthatpeoplemightbeconcernedabout.“InLondon'sbusyPiccadillyCircus—whichisalreadyfilledwithclosed-circuitsurveillance(监视）cameras—reactiontothenewtechnologywasmixed.Somesaidthecamerawasgoingtoofarandviolatingprivacy，butotherssaidtheyarewillingtoputsafetybeforeprivacyconcerns.“There’ssurveillanceeverywhereanyway“saidonecommuter.“Idon'tthinkit’smuchofadifference.Idon'tcarethattheycanseethroughmebecausetheycanseemeanyway.“
Someexpertssaidtheprivacyviolationofthecamerawasnotworththebenefit.“Whatweshouldconsiderishowmuchwewanttoloseourprivacyinordertoobtainasortofnationalsecurity，”saidDavidMurakamiWood，directoroftheSurveillanceStudiesnetwork，whichdealswithsurveillanceandprivacyproblems.“Inmostcasesthisisn'trealsecurity—it’sasenseofsafetythathasverylittlerealeffect.”
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WhatcanwelearnaboutT5000?
A.Itcandetectmetallicandnonmetallicobjectsunder
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