Oscilloscope-based teeb liab generator thiab siv broadband radar signals
Yuav ua li cas lub oscilloscope ua haujlwm
Ib qho oscilloscope yog ib qho khoom siv hluav taws xob ntsuas uas siv cov yam ntxwv ntawm cov raj oscilloscope hluav taws xob los hloov cov hluav taws xob hloov hluav taws xob uas tsis tuaj yeem pom ncaj qha los ntawm tib neeg lub qhov muag rau hauv cov duab thiab tso rau ntawm lub vijtsam fluorescent rau kev ntsuas. Nws yog ib qho tseem ceeb thiab tseem ceeb cov cuab yeej rau kev soj ntsuam cov kev sim ntsuas hluav taws xob digital, txheeb xyuas cov teeb meem hauv kev sim, thiab ntsuas cov txiaj ntsig kev sim. Lub oscilloscope muaj ib lub oscilloscope raj thiab lub hwj chim mov system, synchronization system, X-axis deflection system, Y-axis deflection system, ncua sij hawm scanning system, thiab txheem teeb liab qhov chaw.
1. Oscilloscope raj
Cathode ray tube (CRT), hu ua oscilloscope tube, yog lub hauv paus ntawm oscilloscope. Nws converts hluav taws xob teeb liab mus rau hauv lub teeb teeb liab. Raws li pom nyob rau hauv daim duab 1, cov phom electron, deflection system thiab phosphor screen raug kaw nyob rau hauv lub tshuab nqus tsev iav plhaub los ua ib tug ua tiav oscilloscope raj.
(1) fluorescent screen
Niaj hnub no lub oscilloscope raj cov ntxaij vab tshaus feem ntau yog lub dav hlau, nrog ib txheej ntawm phosphorescent cov ntaub ntawv tso rau ntawm lub puab nto los ua ib tug fluorescent zaj duab xis. Ib txheej ntawm evaporated txhuas zaj duab xis yog feem ntau ntxiv rau cov fluorescent zaj duab xis. Cov hluav taws xob ceev ceev dhau los ntawm cov yeeb yaj kiab txhuas thiab ntaus cov phosphor los ua cov pob ci ci. Aluminium zaj duab xis muaj qhov cuam tshuam sab hauv, uas yog qhov zoo rau kev txhim kho qhov ci ntsa iab ntawm qhov kaj. Aluminium zaj duab xis kuj muaj lwm yam haujlwm xws li cua sov dissipation.
Thaum lub foob pob hluav taws xob nres, qhov chaw ci tsis tuaj yeem ploj tam sim ntawd tab sis yuav tsum nyob twj ywm rau ib lub sijhawm. Lub sijhawm nws siv rau qhov ci ntawm qhov chaw ci ntsa iab kom poob mus rau 10% ntawm nws tus nqi qub yog hu ua "lub sijhawm tom qab". Afterglow lub sij hawm luv dua 10μs yog hu ua luv heev afterglow, 10μs-1ms yog luv afterglow, 1ms-0.1s yog nruab nrab afterglow, 0.1s-1s yog ntev tom qab, thiab ntau tshaj 1s yog heev ntev afterglow. Feem ntau, oscilloscopes yog nruab nrog nruab nrab persistence oscilloscope raj, high-frequency oscilloscopes siv luv luv, thiab tsawg zaus oscilloscopes siv ntev persistence.
(2) Electron phom thiab tsom
Cov phom electron muaj filament (F), cathode (K), daim phiaj (G1), pem hauv ntej accelerating electrode (G2) (los yog ob daim phiaj), thawj anode (A1) thiab thib ob anode (A2). Nws muaj nuj nqi yog emit electrons thiab tsim ib tug nyias nyias, high-ceev electron beam. Lub filament yog energized kom sov lub cathode, thiab lub cathode emits electrons thaum rhuab.
Daim phiaj yog ib lub tog raj kheej hlau nrog lub qhov me me rau saum toj, uas tau muab tso rau sab nraum lub cathode. Txij li thaum lub rooj vag muaj peev xwm qis dua lub cathode, nws tswj cov electrons tawm los ntawm cathode. Feem ntau, tsuas yog ib qho me me ntawm cov khoom siv hluav taws xob nrog qhov pib loj tshaj plaws ntawm kev txav mus los tuaj yeem dhau los ntawm lub qhov rooj qhov rooj thiab maj nrawm mus rau lub vijtsam fluorescent nyob rau hauv qhov kev txiav txim ntawm anode voltage. Electrons nrog me me tshaj tawm tseem rov qab mus rau cathode.
Yog tias lub rooj vag muaj peev xwm tsawg dhau, tag nrho cov electrons rov qab mus rau cathode, uas yog, lub raj raug muab tua. Kho lub W1 potentiometer hauv Circuit Court tuaj yeem hloov lub rooj vag muaj peev xwm thiab tswj qhov ceev ntawm electron ntws mus rau lub vijtsam fluorescent, yog li kho qhov ci ntawm qhov chaw ci. Thawj anode, thib ob anode thiab pem hauv ntej accelerating electrode yog peb lub tog raj kheej hlau ntawm tib axis li cathode. Pem hauv ntej accelerating ncej G2 txuas nrog A2, thiab lub peev xwm siv tau siab dua A1. Lub peev xwm zoo ntawm G2 nrawm cov electrons los ntawm cathode mus rau fluorescent screen.
Raws li cov kab hluav taws xob tawm ntawm lub cathode mus rau lub vijtsam phosphor, nws tau ua ob txoj haujlwm tsom. Thawj qhov kev tsom xam yog ua tiav los ntawm K, G1, thiab G2. K, K, G1, thiab G2 yog hu ua thawj lub tshuab hluav taws xob ntawm lub oscilloscope raj. Qhov thib ob tsom xam tshwm sim nyob rau hauv G2, A1, thiab A2 cheeb tsam. Kev kho lub peev xwm ntawm qhov thib ob anode A2 tuaj yeem ua rau lub teeb hluav taws xob sib txuas ntawm qhov taw tes ntawm lub vijtsam fluorescent. Qhov no yog qhov thib ob tsom. Qhov hluav taws xob ntawm A1 yog hu ua qhov ntsuas hluav taws xob, thiab A1 tseem hu ua tus ncej tsom. Qee lub sij hawm kho qhov voltage ntawm A1 tseem tsis tuaj yeem ua kom pom tseeb, thiab qhov hluav taws xob ntawm qhov thib ob anode A2 yuav tsum tau kho kom zoo. A2 tseem hu ua auxiliary focusing electrode.
(3) Deflection system
Lub deflection system tswj cov kev taw qhia ntawm lub teeb hluav taws xob kom lub teeb pom kev ntawm lub fluorescent screen hloov nrog lub teeb liab sab nraud los piav txog lub waveform ntawm cov teeb liab ntsuas. Nyob rau hauv daim duab 8.1, ob khub ntawm kev sib nrig sib perpendicular deflection daim hlau Y1, Y2 thiab Xl, X2 tsim ib tug deflection system. Y-axis deflection phaj yog nyob rau hauv pem hauv ntej thiab X-axis deflection phaj yog nyob rau hauv lub nraub qaum, yog li Y-axis rhiab heev yog siab (qhov ntsuas ntsuas tau ntxiv rau Y-axis tom qab ua tiav). Voltage yog siv rau ob khub ntawm deflection daim hlau raws li qhov chaw hluav taws xob yog tsim los ntawm ob khub ntawm deflection daim hlau, uas tswj cov deflection ntawm electron beam nyob rau hauv ntsug thiab kab rov tav cov lus qhia feem.
