Cov yam ntxwv tseem ceeb ntawm cov teeb liab optical photodetectors

Cov yam ntxwv tseem ceeb ntawm cov teeb liab opticalphotodetectors:

Ua ntej tshuaj xyuas ntau hom photodetectors, cov yam ntxwv tsis zoo ntawm kev ua haujlwm ntawm kev ua haujlwmoptical teeb liab photodetectorstau sau tseg. Cov yam ntxwv no suav nrog kev teb, spectral teb, suab nrov sib npaug zog (NEP), kev tshawb pom tshwj xeeb, thiab kev tshawb pom tshwj xeeb. D*), quantum efficiency, thiab lub sij hawm teb.

1. responsivity Rd yog siv los ua tus yam ntxwv ntawm cov lus teb rhiab heev ntawm lub cuab yeej rau optical radiation zog. Nws yog sawv cev los ntawm qhov piv ntawm cov teeb liab tso zis rau qhov teeb meem teeb meem. Cov yam ntxwv no tsis cuam tshuam txog lub suab nrov ntawm cov cuab yeej, tab sis tsuas yog kev ua haujlwm ntawm kev hloov hluav taws xob hluav taws xob hluav taws xob hluav taws xob mus rau tam sim no lossis qhov hluav taws xob. Yog li ntawd, nws yuav txawv nrog lub wavelength ntawm qhov teeb meem teeb liab. Tsis tas li ntawd, cov yam ntxwv ntawm lub zog teb kuj yog ib qho kev ua haujlwm ntawm kev siv tsis ncaj ncees thiab qhov kub thiab txias.

2. Cov yam ntxwv ntawm cov lus teb spectral yog ib qho parameter uas qhia txog kev sib raug zoo ntawm lub hwj chim teb tus yam ntxwv ntawm lub teeb liab optical detector thiab lub wavelength muaj nuj nqi ntawm qhov teeb meem kho qhov muag teeb liab. Lub spectral teb yam ntxwv ntawm optical teeb liab photodetectors ntawm txawv wavelengths yog feem ntau piav quantitatively los ntawm "spectral teb nkhaus". Nws yuav tsum tau muab sau tseg tias tsuas yog lub siab tshaj plaws spectral teb cov yam ntxwv nyob rau hauv lub nkhaus yog calibrated los ntawm tus nqi kiag li, thiab lwm yam spectral teb yam ntxwv ntawm txawv wavelengths yog qhia los ntawm normalized txheeb ze tus nqi raws li tus nqi siab tshaj ntawm spectral teb yam ntxwv.

3. Lub suab sib npaug zog yog qhov teeb meem teeb liab teeb liab lub zog yuav tsum tau thaum lub teeb liab tso zis voltage generated los ntawm lub teeb liab optical detector yog sib npaug rau lub suab nrov inherent voltage theem ntawm lub ntaus ntawv nws tus kheej. Nws yog lub ntsiab tseem ceeb uas txiav txim siab qhov tsawg kawg nkaus optical teeb liab siv uas tuaj yeem ntsuas los ntawm lub teeb liab optical detector, uas yog, qhov kev tshawb pom rhiab heev.

4. Kev paub tshwj xeeb rhiab heev yog cov yam ntxwv tsis zoo uas qhia txog cov yam ntxwv ntawm cov khoom siv photosensitive ntawm lub ntes. Nws sawv cev rau qhov teeb meem qis tshaj plaws photon tam sim no ntom ntom uas tuaj yeem ntsuas los ntawm lub teeb pom kev pom qhov muag. Nws tus nqi tuaj yeem sib txawv raws li kev ua haujlwm ntawm lub wavelength detector ntawm lub teeb liab ntsuas (xws li ambient kub, thov kev tsis ncaj ncees, thiab lwm yam). Qhov loj dua lub ntes bandwidth, qhov loj dua qhov chaw teeb liab optical detector, qhov me dua lub suab nrov sib npaug zog NEP, thiab siab dua qhov tshwj xeeb nrhiav kom pom rhiab heev. Qhov tshwj xeeb tshaj qhov kev tshawb pom rhiab heev ntawm tus ntes txhais tau hais tias nws yog qhov tsim nyog rau kev kuaj pom cov teeb liab tsis muaj zog ntau dua.

5. Quantum efficiency Q yog lwm tus yam ntxwv tseem ceeb ntawm cov teeb liab teeb liab ntes. Nws yog txhais raws li qhov piv ntawm tus naj npawb ntawm quantifiable "lus teb" ua los ntawm cov photomon nyob rau hauv lub detector rau tus naj npawb ntawm photons tshwm sim nyob rau saum npoo ntawm cov khoom siv photosensitive. Piv txwv li, rau lub teeb pom kev teeb pom kev ua haujlwm ntawm photon emission, quantum efficiency yog qhov piv ntawm tus naj npawb ntawm photoelectrons tawm ntawm qhov chaw ntawm cov khoom siv photosensitive rau tus naj npawb ntawm photons ntawm cov teeb liab ntsuas ntsuas rau saum npoo. Nyob rau hauv lub teeb liab optical detector siv pn junction semiconductor cov ntaub ntawv raws li cov khoom siv photosensitive, lub quantum efficiency ntawm lub detector yog xam los ntawm kev faib cov xov tooj ntawm electron qhov khub generated los ntawm cov ntsuas lub teeb teeb liab los ntawm cov teeb liab teeb liab photons. Lwm qhov kev sawv cev ntawm quantum efficiency ntawm lub teeb pom kev kho qhov muag yog los ntawm kev siv lub tshuab ntes Rd.

6. Lub sij hawm teb yog ib qho tseem ceeb parameter rau characterize lub teb ceev ntawm lub optical teeb liab detector mus rau qhov siv zog hloov ntawm lub teeb liab ntsuas. Thaum ntsuas lub teeb liab teeb liab tau hloov pauv mus rau hauv daim ntawv ntawm lub teeb mem tes, qhov kev siv ntawm lub teeb liab hluav taws xob hluav taws xob tsim los ntawm nws qhov kev txiav txim ntawm lub ntes yuav tsum "nce" mus rau qhov sib thooj "ncej" tom qab lub sijhawm teb, thiab los ntawm " ncov" thiab tom qab ntawd poob rov qab mus rau qhov pib "zero value" coj mus rau qhov kev txiav txim ntawm lub teeb mem tes. Txhawm rau piav qhia cov lus teb ntawm tus ntes rau qhov kev hloov pauv ntawm qhov ntsuas lub teeb pom kev, lub sijhawm thaum qhov kev siv hluav taws xob hluav taws xob tsim los ntawm qhov teeb meem teeb pom kev nce siab los ntawm nws cov nqi siab tshaj ntawm 10% mus rau 90% yog hu ua "nce lub sij hawm", thiab lub sij hawm thaum hluav taws xob teeb liab mem tes waveform poob los ntawm nws cov nqi siab tshaj ntawm 90% mus rau 10% yog hu ua "lub sij hawm poob" los yog "lub sij hawm lwj".

7. Cov lus teb linearity yog lwm qhov tseem ceeb ntawm cov yam ntxwv uas ua rau muaj kev sib raug zoo ntawm cov lus teb ntawm lub teeb liab optical detector thiab qhov kev siv ntawm qhov teeb meem ntsuas lub teeb liab. Nws yuav tsum tau cov zis ntawm luboptical teeb liab detectorkom proportional nyob rau hauv ib tug tej yam ntau yam ntawm kev siv ntawm lub ntsuas qhov muag teeb liab. Nws feem ntau txhais tau hais tias qhov feem pua ​​​​ntawm qhov sib txawv ntawm qhov input-output linearity nyob rau hauv qhov kev teev tseg ntawm qhov input optical teeb liab siv yog cov lus teb linearity ntawm lub teeb liab optical detector.