Hlau detectors feem ntau muaj peb txoj kev siv tau:
Tsis tshua muaj zaus (VLF), tseem hu ua inductive tshuav nyiaj li cas, yog tej zaum cov txheej txheem tshawb nrhiav feem ntau siv niaj hnub no. Lub elf hlau ntes muaj ob lub coils sib txawv:
Transmitting coil - txheej txheej coil. Sab hauv yog ib co coil ua los ntawm hlau. Cov cuab yeej tshaj tawm tias tam sim no hloov pauv ntau txhiab zaus hauv ib ob raws li cov kev taw qhia ntawm kev hloov pauv thiab hloov pauv. Tus naj npawb ntawm cov kev hloov hauv cov kev taw qhia ntawm qhov tam sim no ib ob yog qhov zaus ntawm qhov kev sojntsuam.
Txais coil - sab hauv coil yog tsim los ntawm lwm qhov coil qhov txhab nrog cov xov hlau. Cov kauj no tuaj yeem siv los ua tus kav hlau txais xov los sau thiab nthuav dav cov hluav taws xob nthwv dej zaus tshaj tawm los ntawm cov khoom siv hauv av.
Tam sim no ntws los ntawm cov xaim xaim hluav taws xob tsim hluav taws xob, ib yam li lub tshuab hluav taws xob tsim hluav taws xob tib yam. Lub polarity ntawm magnetic teb yog ncaj nraim ntawm lub coil txoj hauj lwm dav hlau. Thaum twg tam sim no hloov kev taw qhia, polarity ntawm magnetic teb hloov raws li. Qhov no txhais tau hais tias kev xav tias lub kauj yog sib npaug rau hauv av, cov kev taw qhia ntawm cov hlau nplaum yuav hloov tas li, poob rau hauv av thiab nce rau hauv av.
Raws li cov kev taw qhia ntawm underground magnetic teb hloov ntau zaus, nws yuav cuam tshuam nrog txhua tus neeg xyuas pib lub tswv yim cov khoom tau ntsib, ua rau muaj qhov sib nqus me me uas tsim los ntawm lub tswv yim khoom nws tus kheej. Lub polarity ntawm lub magnetic teb ntawm lub tswv yim kwv yog kiag li opposite rau ntawm lub transmitting kauj. Piv txwv tias cov kev taw qhia ntawm lub magnetic teb generated los ntawm lub transmitting coil yog vertically upward thiab downward, lub magnetic teb ntawm lub tswv yim yam khoom yog vertically upward rau hauv av.
Cov coil txais tuaj yeem tiv thaiv tag nrho cov hlau nplaum tsim los ntawm cov xaim xaim. Tab sis nws yuav tsis tiv thaiv lub magnetic teb ntawm underground txoj cai lub hom phiaj. Yog li ntawd, thaum lub txais kauj nyob rau saum toj ntawm lub tswv yim khoom kis tau tus mob magnetic teb, ib tug me me tam sim no yuav tshwm sim nyob rau hauv lub kauj. Qhov tam sim no vibrates ntawm tib zaus raws li lub magnetic teb ntawm lub tswv yim khoom. Cov coil txais yuav txuas mus rau qhov zaus thiab xa mus rau lub console ntawm lub ntsuas hlau, thiab cov khoom ntawm lub console yuav txheeb xyuas cov teeb liab.
Raws li qhov sib nqus siv zog tsim los ntawm cov khoom siv tswv yim, cov khoom siv hlau tuaj yeem kwv yees li kev txiav txim siab faus qhov tob ntawm cov khoom siv tswv yim. Qhov ntiav cov khoom siv tswv yim yog faus, qhov muaj zog ntawm cov hlau nplaum uas tau txais los ntawm cov coil,
