Yuav ua li cas txiav txim siab seb lub tshuab ntsuas roj puas muab cov ntawv nyeem raug? Qhov no yuav tsum tau xa mus rau ntau qhov kev ntsuas tseem ceeb ntawm cov roj sensor nws tus kheej. xws li repeatability, raug, rhiab heev, thiab qhov haum ntawm nws qhov kev tshawb nrhiav ntau yam. Tab sis dab tsi tiag tiag distinguishes cov parameters ntawm ib leeg?
1. Rov ua dua
Qhov sib xws ntawm cov zis tshwm sim ntawm ib lub sensor thaum raug rau ntau, sib sib zog nqus ntsuas los yog ntsuas ntawm lub sijhawm luv luv hauv cov xwm txheej zoo ib yam. (ie, siv tib lub sensor, tib lub roj concentration, thiab zoo tib yam ambient kub thiab av noo).Qhov kev ntsuas no tsis suav nrog ntev - lub sij hawm drift los yog variations ntawm txawv manufacturing batch.
Kev Sau Npe: Repeatability yog feem ntau qhia raws li tus txheeb ze Standard Deviation (RSD) los yog ib feem ntawm qhov siab tshaj plaws sib txawv. Piv txwv li, "repeatability ntawm ± 2%" txhais tau hais tias qhov ntau ntawm kev sib txawv ntawm ntau qhov kev ntsuas tau poob hauv ± 2% ntawm qhov nruab nrab tus nqi.Repeatability qhia txog qhov ntsuas qhov ntsuas qhov ntsuas qhov ruaj khov thiab nws tsis kam mus rau sab nraud cuam tshuam. Ib lub sensor uas tsis zoo repeatability.txawm yog qhov tseeb calibrated tsis tuaj yeem tso siab rau ib qho kev ntsuas - taw tes, vim qhov kev nyeem ntawv yuav hloov pauv ntau zaus thaum ntsuas ntsuas tom ntej. Hauv cov ntawv thov uas xav tau kev soj ntsuam tas li lossis kev tsom xam ntau (xws li kev saib xyuas ib puag ncig, kev nyab xeeb hauv kev lag luam, lossis kev kuaj mob kho mob), kev rov ua dua yog qhov ntsuas kev ua haujlwm tseem ceeb.
2. Kev daws teeb meem
Qhov no yog hais txog qhov hloov pauv me tshaj plaws hauv qhov ntsuas qhov ntsuas uas lub sensor tuaj yeem kuaj xyuas thiab paub qhov txawv ntawm -tshwj xeeb, qhov kev hloov pauv yam tsawg kawg nkaus uas cov zaub interface lossis cov khoom siv hluav taws xob sab hauv muaj peev xwm daws tau.
3. Qhov tseeb
Qhov kev ntsuas no piav qhia qhov ze npaum li cas los ntawm qhov ntsuas qhov ntsuas ntsuas qhov "tus nqi tseeb"- hauv lwm lo lus, qhov ntsuas qhov tseeb npaum li cas. Nws yog feem ntau qhia nyob rau hauv cov nqe lus ntawm ib tug kiag li sib txawv (piv txwv li, ± ib tug tshwj xeeb tus lej tus nqi), ib feem pua ntawm tag nrho cov scale (±% FS), los yog ib tug feem pua ntawm cov nyeem tiag tiag (±% Nyeem).
Cia peb xav tias koj muaj ob lub sensors tsim los ntsuas cov pa roj carbon monoxide (CO) ntawm qhov concentration ntawm 50 ppm:
Scenario A: Tseeb Concentration=50.0 ppm
Sensor 1: Thawj qhov ntsuas yields 49.9 ppm, thiab qhov thib ob yields 50.1 ppm (ob qho tib si tsis tshua muaj nqi rau qhov tseeb). Qhov no sensor ua kom pom tseeb heev.
High Resolution ≠ High Accuracy: Yog hais tias lub sensor boasts ib tug daws teeb meem ntawm 0.1 ppm (uas zoo nkaus li muab zoo -grained nthuav dav), tab sis nws lub cev calibration yog flawed - ua rau nws mus tas li tso saib 55 ppm thaum ntsuas qhov tseeb roj concentration ntawm 50} tsis zoo, tab sis muaj kev txom nyem los ntawm 50 ppm.
High Accuracy ≠ High Resolution: Lub sensor nrog qhov tseeb ntawm ± 1 ppm tab sis qhov kev daws teeb meem tsuas yog 1 ppm (lub ntsiab lus nyeem tsuas yog cov lej xws li 1, 2, 3 ... ppm) yuav tso saib 50 lossis 51 thaum ntsuas 50 ppm; thaum muaj tseeb, nws tsis muaj fineness. Hloov pauv, lub sensor nrog qhov tseeb ntawm ± 5 ppm tab sis qhov kev daws teeb meem ntawm 0.1 ppm tuaj yeem tso tawm 50.0, tab sis tus nqi tiag tiag yuav yog 55 ppm; Nws zoo nkaus li meej, tab sis qhov tseeb tsis raug.
Kev daws teeb meem txiav txim siab qhov kev hloov pauv tsawg tshaj plaws hauv cov roj concentration uas lub sensor tuaj yeem ntes tau. Piv txwv li, thaum saib xyuas cov pa roj paug, kev daws teeb meem siab (piv txwv li, 0.1 ppm) yog qhov yuav tsum tau ua kom nce qib hauv cov concentration. Qhov tseeb txiav txim siab txog qib uas koj tuaj yeem ntseeg tus nqi tshaj tawm. Yog tias qhov tseeb yog ± 5 ppm, kev nyeem ntawv ntawm 10 ppm tuaj yeem ua tau raws li 5 ppm (kev nyab xeeb) lossis 15 ppm (kev phom sij)- qhov tsis txaus ntseeg tseem ceeb rau kev ceeb toom kev nyab xeeb.
4. Kev xav
Qhov sib piv ntawm qhov kev hloov pauv hauv cov teeb liab tawm mus rau qhov kev hloov pauv hauv qhov kev tawm tswv yim concentration (qhov nqes ntawm qhov nkhaus); Qhov tseem ceeb nug, "Qhov tseem ceeb npaum li cas yog lub sensor teb rau feeb hloov?" Nws yog qhia raws li qhov piv (piv txwv li, nA / ppm).
Qhov tseeb yog zoo li qhov ntsuas ntawm lub tshuab ntsuas qhov ntsuas - nws txiav txim siab seb qhov "1 centimeter" koj saib tiag tiag sib raug rau ib centimeter tiag tiag.
Ib qho kev ntsuas roj zoo yuav tsum muaj kev sib xyaw ua ke ntawm ob qho tib si: kev daws teeb meem txaus (kom pom cov kev hloov pauv hauv lub sijhawm) thiab qhov tseeb muaj zog (kom ntseeg tau tias cov txiaj ntsig tau tshaj tawm yog kev ntseeg siab). Txawm li cas los xij, yog tias ib tus yuav tsum xaiv ntawm ob, qhov tseeb yog qhov tseem ceeb tshaj qhov kev daws teeb meem hauv cov ntsiab lus ntawm kev saib xyuas kev nyab xeeb.
Precision yog lub hom phiaj kawg: High precision=Zoo repeatability + Accurate calibration (yam tsawg kawg systematic yuam kev).