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til å logge inn, men det er ikke obligatorisk [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Logg inn</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Nettsted"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <h1 id="firstHeading" class="firstHeading mw-first-heading">Vis kilden til Nattoptikk</h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" 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class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Nattoptikk" title="Vis innholdssiden [c]" accesskey="c"><span>Artikkel</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Diskusjon:Nattoptikk" rel="discussion" title="Diskusjon om innholdssiden [t]" accesskey="t"><span>Diskusjon</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Bytt språkvariant" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">norsk bokmål</span> 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Husk å ta med alle detaljene ovenfor.</div></div><hr /> <p>Du kan se og kopiere kildekoden til denne siden: </p><textarea readonly="" accesskey="," id="wpTextbox1" cols="80" rows="25" style="" class="mw-editfont-monospace" lang="nb" dir="ltr" name="wpTextbox1">'''Nattoptikk''' er optiske hjelpemidler som brukes for å se i mørket. Disse fordeles i to hovedkategorier av teknologi: Bildeforbedring og termisk avbildning.<ref>{{Kilde www|url=https://electronics.howstuffworks.com/gadgets/high-tech-gadgets/nightvision.htm|tittel=How Night Vision Works|besøksdato=2024-09-09|dato=2001-04-27|språk=en-us|verk=HowStuffWorks}}</ref> Bildeforbedring forsterker eksisterende lys (visuelt og nær-[[Infrarød stråling|infrarødt lys]]) mens termisk avbildning bruker forskjell i varmesignatur (termisk IR-stråling) for å generere et bilde. == Bildeforbedring == [[Fil:Special_tactics_operatorfrom_the_24th_Special_Operations_Wing.jpg|miniatyr|250x250pk|Night Vision Goggles, (NVG) forsterker eksisterende lys]] Bildeforbedringoptikk forsterker eksisterende lys som befinner seg i det nær-infrarøde (typisk lys fra verdensrommet) og visuelle spektret. Lys forsterkes på følgende måte: [[Fil:Iron_Knights_at_Night_150124-A-AG877-391.jpg|miniatyr|Landskap sett igjennom NVG]] # [[Foton]]er i nevnte spekter entrer nattbrillenes linse. # Fotonene går videre inn i et bildeforsterker-rør ''(image-intensifier tube)'' som inneholder en [[Fotomultiplikator|fotokatode]]. Fotokatoden frigir [[elektron]]er når den treffes av fotoner. # Etter som elektronene reiser fra katoden, treffer de en strømsatt plate (''microchannel plate, MCP''). Dette er en liten skive av glass med millioner av mikroskopiske hull/mikrokanaler i seg. MCP befinner seg i et vakuum og har elektroder på hver side av platen. Hver mikrokanal er ca 45 ganger så lang som den er vid, og fungerer som en [[elektronmultiplikator]] som øker antall elektroner tusenvis av ganger. Etter som elektronene treffer veggene på tur gjennom en mikrokanal blir antallet elektroner mangedoblet. I enden av MCP treffer disse elektronene en fosforskjerm. Fosforet emitterer lys (fotoner) når elektronene treffer, og et «lysforsterket» bilde blir presentert for brukeren. == Termisk avbildning == [[Fil:Thermal_imaging_of_a_rat.jpg|miniatyr|En rotte gjennom termisk avbildning]] Termisk avbildning benytter forskjell i varmesignatur i det som observeres for å generere et bilde. Til forskjell fra bildeforbedring-/lysforsterker-optikk, som benytter seg av lyset som blir reflektert i omgivelsene, benytter termisk avbildning energi i form av infrarød stråling som blir emittert av objekter i omgivelsene. [[Fil:Thermal_Skylarks.png|miniatyr|Sanglerker observert på lang avstand gjennom termisk avbildning]] # Strålingen i område som observeres treffer linsen og blir etter dette skannet av elektronisk styrte IR detektorer som har tusenvis av observasjonpunkt. # Detektorene skaper et detaljert temperaturmønster kalt et termogram. # Termogrammet blir omgjort til elektriske impulser som sendes til en dataenhet, bestående av signal-behandlingsenhet og kretskort, som omgjør informasjonen til digital data. # Data blir sendt til og presentert på en skjerm, som presenterer det observerte i form av forskjellige farger som samsvarer med temperaturforskjellen på det som observeres. Det finnes to hovedtyper teknologi for termisk avbildning: Ikke-avkjølte og avkjølte Ikke-avkjølt optikk er den mest utbredte, billigste, men mist nøyaktige. Avkjølte enheter er mye mer kostbare, men også ekstremt nøyaktige. Termisk avbildning brukes brukes blant annet av forsvar, politi, redningstjenester, jegere eller ofte som et verktøy i undersøkelse av bygninger for å avdekke kuldebroer, i elektriske anlegg for å oppdage varmgang eller på andre områder der temperaturforskjeller kan gi en indikasjon på problemer. == Referanser == <references/> == Eksterne lenker == * {{Offisielle lenker}} {{autoritetsdata}} [[Kategori:Optikk]] </textarea><div class="templatesUsed"><div class="mw-templatesUsedExplanation"><p>Maler som brukes på denne siden: </p></div><ul> <li><a href="/wiki/Mal:Autoritetsdata" title="Mal:Autoritetsdata">Mal:Autoritetsdata</a> (<a href="/w/index.php?title=Mal:Autoritetsdata&action=edit" title="Mal:Autoritetsdata">vis kilde</a>) (halvbeskyttet)</li><li><a href="/wiki/Mal:Hlist/styles.css" title="Mal:Hlist/styles.css">Mal:Hlist/styles.css</a> (<a href="/w/index.php?title=Mal:Hlist/styles.css&action=edit" title="Mal:Hlist/styles.css">rediger</a>) </li><li><a href="/wiki/Mal:ISOtilNorskdato" 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