Fotokozani kuchuluka kwa bandwidth ndi nthawi yokwera ya chowunikira zithunzi

Fotokozani kuchuluka kwa bandwidth ndi nthawi yokwera ya chowunikira zithunzi

Nthawi yowunikira ndi nthawi yowunikira (yomwe imadziwikanso kuti nthawi yoyankha) ya chowunikira zithunzi ndi zinthu zofunika kwambiri pakuyesa chowunikira chowunikira. Anthu ambiri sadziwa chilichonse chokhudza magawo awiriwa. Nkhaniyi ifotokoza momveka bwino nthawi yowunikira ndi nthawi yowunikira ya chowunikira zithunzi.

Nthawi yokwera (τr) ndi nthawi yogwa (τf) zonse ndi zizindikiro zofunika kwambiri poyesa liwiro la mayankho a ma photodetector. Bandwidth ya 3dB, monga chizindikiro mu frequency domain, imagwirizana kwambiri ndi nthawi yokwera pankhani ya liwiro la mayankho. Ubale pakati pa bandwidth BW ya photodetector ndi nthawi yake yoyankha Tr ukhoza kusinthidwa motere: Tr=0.35/BW.

Nthawi yokwera ndi mawu mu ukadaulo wa pulse, kufotokozera ndi kutanthauza kuti chizindikiro chimakwera kuchokera pamalo amodzi (nthawi zambiri: Vout * 10%) kupita kumalo ena (nthawi zambiri: Vout * 90%). Kutalika kwa m'mphepete mwa chizindikiro cha Rise Time nthawi zambiri kumatanthauza nthawi yomwe imatenga kuti ikwere kuchokera pa 10% mpaka 90%. Mfundo yoyesera: Chizindikiro chimatumizidwa m'njira inayake, ndipo mutu wina wotsanzira umagwiritsidwa ntchito kupeza ndikuyesa kuchuluka kwa pulse yamagetsi kumapeto kwakutali.

Nthawi yokwera ya chizindikiro ndi yofunika kwambiri pomvetsetsa mavuto okhudzana ndi kukhulupirika kwa chizindikiro. Mavuto ambiri okhudzana ndi magwiridwe antchito a chinthucho pakupanga ma photodetector othamanga kwambiri amagwirizanitsidwa nacho. Posankha photodetector, iyenera kupatsidwa chisamaliro chokwanira. Nthawi yokwera imakhudza kwambiri magwiridwe antchito a dera. Bola ngati ili mkati mwa mtunda winawake, iyenera kuonedwa mozama, ngakhale itakhala yosiyana kwambiri.

Pamene nthawi yokwera kwa chizindikiro ikuchepa, mavuto monga kuwunikira, kulankhulana mozungulira, kugwa kwa orbit, kuwala kwa magetsi, ndi kugwedezeka kwa nthaka komwe kumachitika chifukwa cha chizindikiro chamkati kapena chizindikiro chotulutsa cha photodetector kumakhala koopsa kwambiri, ndipo vuto la phokoso limakhala lovuta kuthetsa. Kuchokera pakuwona kwa spectral analysis, kuchepetsa nthawi yokwera kwa chizindikiro kuli kofanana ndi kuwonjezeka kwa bandwidth ya chizindikiro, ndiko kuti, pali zigawo zambiri zama frequency apamwamba mu chizindikiro. Ndi zigawo izi zama frequency apamwamba zomwe zimapangitsa kapangidwe kake kukhala kovuta. Mizere yolumikizirana iyenera kuonedwa ngati mizere yotumizira, zomwe zabweretsa mavuto ambiri omwe sanalipo kale.

Chifukwa chake, mukugwiritsa ntchito zida zowunikira zithunzi, muyenera kukhala ndi lingaliro lotere: pamene chizindikiro chotulutsa cha chida chowunikira zithunzi chili ndi m'mphepete wokwera kwambiri kapena ngakhale kukwera kwambiri, ndipo chizindikirocho sichikhazikika, ndizotheka kuti chida chowunikira zithunzi chomwe mudagula sichikukwaniritsa zofunikira pakupanga mawonekedwe oyenera a chizindikiro ndipo sichingakwaniritse zofunikira zanu zenizeni pogwiritsira ntchito bandwidth ndi nthawi yokwera. Zogulitsa zowunikira zithunzi za JIMU Guangyan zonse zimayesa ma chips apamwamba aposachedwa a photoelectric, ma chips operating amplifier operating speed, ndi ma filter circuits enieni. Malinga ndi mawonekedwe enieni a chizindikiro cha ogwiritsa ntchito, zimagwirizana ndi bandwidth ndi nthawi yokwera. Gawo lililonse limaganizira umphumphu wa chizindikiro. Pewani mavuto wamba monga phokoso lalikulu la chizindikiro ndi kukhazikika koyipa komwe kumachitika chifukwa cha kusagwirizana pakati pa bandwidth ndi nthawi yokwera pakugwiritsa ntchito zida zowunikira zithunzi kwa ogwiritsa ntchito.