Koj puas paub dab tsi yog PAR / PPF / PPFD / YPF / YPFD? Lawv yog cov tsis tseem ceeb ntawm LED cog kev loj hlob teeb.
Photosynthetic active hluav taws xob PAR (Photosynthetic Active Radiation)
Cov hluav taws xob hauv qhov tshwj xeeb wavelength ntau yam (400-700nm) siv los ntawm cov nroj tsuag rau photosynthesis hu ua photosynthetically nquag hluav taws xob, thiab muaj ob daim ntawv sau npe:
Ib qho yog qhia los ntawm photosynthetic irradiance (w / m2), uas yog tsuas yog siv rau kev tshawb fawb dav dav ntawm photosynthesis ntawm tshav ntuj.
Qhov thib ob yog qhia los ntawm photosynthetic photon flux ntom ntom PPFD (umol / m2s), uas yog siv rau kev kawm ntawm cov nroj tsuag photosynthesis los ntawm cov khoom siv hluav taws xob thiab hnub ci.
Txoj kev no ntawm kev siv cov photon flux radiated rau saum npoo ntawm cov nroj tsuag ib ob los qhia txog lub peev xwm ntawm cov hluav taws xob hluav taws xob yog hu ua PPF_PAR txoj kev. PAR suav txog li 50% ntawm tag nrho cov hnub ci hluav taws xob. Nws yuav tsum raug sau tseg tias chav tsev ntawm photosynthetic irradiance tsis cuam tshuam qhov cuam tshuam ntawm wavelength.
PPF:
Photosynthetic Photon Flux (Photosynthetic Photon Flux) yog hais txog tus naj npawb ntawm micromoles ntawm photons emitted ib ob los ntawm ib qho kev tsim teeb pom kev zoo nyob rau hauv lub wavelength ntawm 400-700nm, hauv umol / s.
PPFD:
Photosynthetic Photon Flux Density (Photosynthetic Photon Flux Density) thiab PPF sib haum rau cov micromoles radiated los ntawm lub teeb qhov chaw ib square meter ib ob, nyob rau hauv umol / m2s, uas yog lub tswvyim ntawm ceev.
PPFD yog PPF qhia hauv ib square meter.
PPFD yog ib qho ntawm lub cev muaj feem cuam tshuam nrog cov hluav taws xob nyob deb, uas yog inversely proportional rau lub square ntawm cov hluav taws xob nyob deb.
1PPFD txhais tau hais tias 1 micromole ntawm photons ib ob radiates ntawm ib tug meter square. 1 umol / m2s (PPFD) loj npaum li cas? Nws txhais tau hais tias muaj 6 photons hauv 10 square nanometers.
YPF:
Lub generated photon flux (Yield Photon Flux) yog hais txog tus naj npawb ntawm micromoles ntawm photons radiated ib ob nyob rau hauv lub wavelength ntau emitted los ntawm lub teeb ci, nyob rau hauv units ntawm umol / s. Feem ntau suav hais tias wavelength band yog 360-760nm. Rau LED teeb qhov chaw, lub wavelength ntau yog teem rau 380-800nm.
YPFD:
Lub generated photon flux ceev (YieldPhotonFluxDensity), uas sib haum mus rau YPF, yog tus naj npawb ntawm micromoles ntawm hluav taws xob ib square meter ib ob, nyob rau hauv units ntawm umol / m2s, uas yog lub tswvyim ntawm ceev.
YPFD txhais tau tias YPF nyob rau hauv thaj tsam ntawm ib square meter.
YPFD yog ib qho ntawm lub cev muaj feem cuam tshuam rau qhov kev ncua deb ntawm hluav taws xob, uas yog inversely proportional rau lub square ntawm cov hluav taws xob nyob deb.
YPFD tuaj yeem qhia qhov tseeb ntau ntawm LED cog lub teeb zoo.
Qhov txawv ntawm PAR thiab PPFD, PAR yog lub tswv yim ntawm lub cev, thiab chav tsev ntawm lub cev lub tswv yim ntawm PPFD.
Kev sib raug zoo ntawm PPFD thiab PPF: PPFD yog qhov yooj yim kom muaj nuj nqis los ntawm cov txheej txheem cog, thiab PPF yog qhov tseem ceeb rau kev tsim teeb.
