Kev siv ppm hauv Kev Ntsuas
1mm ntxiv rau 1ppm yog cov ntawv luv ntawm 1mm ntxiv rau 1ppm × D (kilometer), uas qhia txog qhov nominal qhov tseeb ntawm tag nrho cov chaw nres tsheb lossis rangefinder. hauv:
1mm sawv cev rau qhov kev ua yuam kev tas li ntawm qhov ntsuas, uas feem ntau yog tshwm sim los ntawm kev ntsuas qhov yuam kev, qhov nruab nrab qhov yuam kev, thiab theem ntsuas qhov yuam kev ntawm qhov ntsuas ntxiv tas li. Qhov yuam kev ruaj khov tsis muaj dab tsi cuam tshuam nrog qhov ntsuas qhov deb. Ntawd yog, txawm tias qhov ntsuas qhov deb npaum li cas, qhov chaw nres tsheb tag nrho yuav muaj qhov yuam kev ruaj khov tsis ntau dua li tus nqi no.
1ppm × Dkm sawv cev rau qhov kev ua yuam kev proportional, qhov twg 1 yog qhov sib npaug ntawm qhov yuam kev coefficient, uas feem ntau yog tshwm sim los ntawm qhov ntsuas qhov ua yuam kev thiab cov atmospheric refractive index yuam kev. ppm txhais tau tias qhov chaw ib lab (ob peb), thiab D yog tus nqi nyob deb tau ntsuas los ntawm tag nrho cov chaw nres tsheb lossis rangefinder, hauv mais. Raws li qhov tseeb ntsuas qhov deb hloov, qhov proportional yuam kev ntawm qhov ntsuas kuj hloov proportionally. Piv txwv li, thaum qhov kev ncua deb yog 1 km, qhov ntsuas qhov yuam kev yog 1 hli.
Rau tag nrho cov chaw nres tsheb lossis rangefinder nrog qhov tseeb ntawm 1mm ntxiv rau 1ppm, thaum ntsuas qhov deb yog 1km, qhov ntsuas qhov tseeb yog 1mm ntxiv rau 1ppm × 1 (km) =2mm, uas yog hais tias, tag nrho Qhov kev ncua deb ntawm qhov chaw nres tsheb ntsuas yog 1 km, thiab qhov siab tshaj qhov kev ua yuam kev yog tsis ntau tshaj 2 hli.
3 vib nas this yog lub sijhawm rau kev sib tw
