Taura nezve bandwidth uye nguva yekukwira kwe photodetector
Bandwidth nenguva yekukwira (inozivikanwawo senguva yekupindura) ye photodetector zvinhu zvakakosha pakuedza optical detector. Vanhu vazhinji havana ruzivo nezvema parameter maviri aya. Chinyorwa chino chichatsanangura zvakananga bandwidth nenguva yekukwira ye photodetector.
Nguva yekukwira (τr) nenguva yekudonha (τf) zvese zviratidzo zvikuru zvekuyera kumhanya kwekupindura kwema photodetectors. Bandwidth ye3dB, sechiratidzo munharaunda yema frequency, ine hukama hwakasimba nenguva yekukwira maererano nekumhanya kwekupindura. Hukama huri pakati pebandwidth BW ye photodetector nenguva yayo yekupindura Tr inogona kushandurwa nefomula inotevera: Tr=0.35/BW.
Nguva yekukwira izwi rinoshandiswa mu pulse technology, richitsanangura uye richireva kuti chiratidzo chinokwira kubva pane imwe point (kazhinji: Vout*10%) kuenda kune imwe point (kazhinji: Vout*90%). Amplitude ye rising edge ye Rise Time signal inowanzoreva nguva inotorwa kuti ikwire kubva pa10% kusvika pa90%. Nheyo yekuyedza: Chiratidzo chinopfuudzwa munzira yakati, uye imwe sample head inoshandiswa kuwana nekuyera voltage pulse value ku remote end.
Nguva yekukwira kwechiratidzo yakakosha pakunzwisisa matambudziko ekuvimbika kwechiratidzo. Matambudziko mazhinji ane chekuita nekushanda kwechigadzirwa mukugadzirwa kwema photodetectors e bandwidth anomhanya anobatanidzwa nacho. Pakusarudza photodetector, inofanira kutariswa zvakakwana. Nguva yekukwira ine simba guru pakushanda kwedunhu. Chero bedzi iri mukati meimwe nzvimbo, inofanira kutorwa zvakakomba, kunyangwe iri nzvimbo isina kujeka.
Sezvo nguva yekukwira kwechiratidzo ichidzikira, matambudziko akadai sekuratidzira, kutaura kwecrosstalk, kudonha kweorbit, mwaranzi yemagetsi, uye kusvetuka kwepasi kunokonzerwa nechiratidzo chemukati kana chiratidzo chekubuda kwephotodetector kunowedzera kuoma, uye dambudziko reruzha rinowedzera kuoma kugadzirisa. Kubva pamaonero ekuongorora kwespectral, kudzikiswa kwenguva yekukwira kwechiratidzo kwakaenzana nekuwedzera kwebandwidth yechiratidzo, kureva kuti, kune zvikamu zvakawanda zvemafrequency akakwira muchiratidzo. Ndizvo chaizvo zvikamu izvi zvemafrequency akakwira zvinoita kuti dhizaini yacho iome. Mitsetse yekubatanidza inofanirwa kubatwa semitsetse yekutumira, izvo zvakakonzera matambudziko mazhinji asina kumbovapo.
Saka, mukushandisa ma photodetectors, unofanira kuva nepfungwa yakadaro: kana chiratidzo chekubuda che photodetector chiine mupendero wakakura kana kutowedzera zvakanyanya, uye chiratidzo chisina kugadzikana, zvingangoita kuti photodetector yawakatenga isasvike zvinodiwa zvekugadzira masaini uye haigone kusangana nezvinodiwa zvako zvekushandisa maererano nebandwidth nenguva yekukwira. Zvigadzirwa zve photoelectric detector zveJIMU Guangyan zvese zvinoedza ma photoelectric chips matsva, ma high-speed operational amplifier chips, uye ma filter circuits chaiwo. Zvichienderana nehunhu hwechiratidzo chekushandisa chevatengi, zvinoenderana nebandwidth nenguva yekukwira. Danho rega rega rinofunga nezvekuvimbika kwechiratidzo. Dzivisa matambudziko akajairika akadai seruzha rwechiratidzo chakakwira uye kusagadzikana kwakashata kunokonzerwa nekusawirirana pakati pebandwidth nenguva yekukwira mukushandisa ma photodetectors kune vashandisi.
Nguva yekutumira: Gunyana-29-2025