He aha te "mowhiti muka hurihuri"? E hia tō mōhiotanga mōna?
Whakamāramatanga: He mowhiti muka whatu e taea ai e te mārama te huri i ngā wā maha
He mowhiti muka porowhita tetaputapu muka whatue taea ai e te mārama te huri whakamuri me te hoki whakamuri i ngā wā maha. E whakamahia ana i roto i te pūnaha whakawhitiwhiti muka whatu tawhiti. Ahakoa he roa mutunga kore omuka whatu, ka taea te tuku i te mārama tohu ki ngā tawhiti tino tawhiti mā te takai i ngā wā maha. Mā tēnei ka āwhina i te ako i ngā pānga kino me te kore-raina whatu e pā ana ki te kounga mārama o te tohu.
I roto i te hangarau taiaho, ka taea te whakamahi i ngā koropiko muka hurihuri hei ine i te whānui rārangi o terēseri, inā koa he iti rawa te whānui o te rārangi (<1kHz). He toronga tēnei o te tikanga ine whānui o te rārangi whaiaro-heterodyne, kāore e hiahiatia he taiaho tohutoro tāpiri hei tiki i tētahi tohu tohutoro mai i a ia anō, e hiahia ana ki te whakamahi i ngā muka aratau-kotahi roa. Ko te raruraru o te hangarau kimi whaiaro-heterodyne ko te roa o te wā e hiahiatia ana he rite tonu te raupapa ki te tauutuutu o te whānui o te rārangi, nō reira he torutoru noa ngā kHz o te whānui o te rārangi, ā, ahakoa he iti iho i te 1kHz, he roa rawa ngā muka e hiahiatia ana.
Pikitia 1: Kauwhata hoahoa o te mowhiti muka porowhita.
Ko te take matua mō te whakamahi i ngā koropiko muka he mea ka taea e te muka roa-waenga te whakaroa i te wā roa nā te mea he maha ngā hurihanga e haere ana te mārama i roto i te muka. Hei wehewehe i te mārama e tukuna ana i roto i ngā koropiko rerekē, ka taea te whakamahi i te modulator acousto-optic i roto i te koropiko hei whakaputa i tētahi nekehanga auau (hei tauira, 100MHz). Nā te mea he nui ake tēnei nekehanga auau i te whānui o te rārangi, ka taea te wehewehe i te mārama kua haere i tētahi maha rerekē o ngā hurihanga i roto i te koropiko i roto i te rohe auau. I roto i tepūoko whakaahua, te taketakemārama taiahoā, ka taea te whakamahi i te pao o te mārama i muri i te nekehanga auau hei ine i te whānui o te rārangi.
Ki te kore he taputapu whakakaha i roto i te koropiko, ka tino nui te ngaronga o te modulator acousto-optic me te muka, ā, ka tino heke te kaha o te mārama i muri i ētahi koropiko. Ka tino whakawhāitihia e tēnei te maha o ngā koropiko ina inehia te whānui raina. Ka taea te tāpiri i ngā whakakaha muka ki te koropiko hei whakakore i tēnei herenga.
Heoi, ka puta he raruraru hou i tēnei: ahakoa he tino motuhake te mārama e whiti ana i ngā hurihanga rerekē, ka puta te tohu patu i ngā takirua photon rerekē, ka huri i te whānuitanga patu katoa. Ka taea te hoahoa tika i te mowhiti muka whatu hei aukati i ēnei pānga. Hei whakamutunga, ka whakawhāitihia te aro o te koropiko muka hurihuri e te haruru o tewhakakaha mukaMe whai whakaaro anō hoki ki te kore-raina o te muka me ngā raina kore-Lorentz i roto i te tukatuka raraunga.
Wā tuku: Hakihea-12-2023