ʻenehana ʻike leo mamao laser

ʻenehana ʻike leo mamao laser
Laserʻike ʻōlelo mamao: Hōʻike i ke ʻano o ka ʻōnaehana ʻike

Hulahula ʻia kahi kukuna laser lahilahi ma ka lewa, e ʻimi mālie ana i nā leo mamao, ʻo ke kumu ma hope o kēia "magic" ʻenehana futuristic he esoteric a piha i ka nani. I kēia lā, e hāpai kākou i ka pale ma luna o kēia ʻenehana kupanaha a e ʻimi i kona ʻano nani a me nā loina. Hōʻike ʻia ke kumu o ka ʻike leo mamao laser ma ke Kiʻi 1 (a). Hoʻokumu ʻia ka ʻōnaehana ʻike leo mamao laser me ka ʻōnaehana ana vibration laser a me ka pahuhopu ana hoʻohiwahiwa ʻole. Wahi a ke ʻano ʻike o ka hoʻihoʻi māmā, hiki ke hoʻokaʻawale ʻia ka ʻōnaehana ʻike i ke ʻano non-interference a me ke ʻano interference, a ua hōʻike ʻia ke kiʻi schematic ma ke kiʻi 1 (b) a me (c).

FIG. 1 (a) Paʻi poloka o ka ʻike leo mamao mamao laser; (b) Ke kiʻikuhi schematic o non-interferometric laser remote vibration ana ʻōnaehana; (c) Kiʻikuhi kumu o ka ʻōnaehana ana haʻalulu mamao interferometric laser

一. ʻO ka ʻōnaehana ʻike keʻakeʻa ʻole he ʻano maʻalahi loa ka ʻike maka ʻole o nā hoaaloha, ma o ka laser irradiation o ka ʻili i hoʻopaʻa ʻia, me ka neʻe oblique o ka modulation azimuth māmā i hōʻike ʻia e hopena i nā loli i ka hopena o ka loaʻa ʻana o ka ikaika a i ʻole kiʻi speckle. e ana pololei i ka micro-vibration o ka ʻili i manaʻo ʻia, a laila "pololei i ka pololei" no ka loaʻa ʻana o ka hōʻailona acoustic mamao. E like me ke ano o ka loaa anamea nānā kiʻi, hiki ke hoʻokaʻawale i ka ʻōnaehana non-interference i hoʻokahi ʻano kiko a me ke ʻano array. ʻO ke kumu o ka hoʻolālā kiko hoʻokahi ʻo ia ka "hana hou o ka hōʻailona acoustic", ʻo ia hoʻi, ua ana ʻia ka haʻalulu o ka ʻili o ka mea ma ke ana ʻana i ka hoʻololi ʻana o ka ʻike ʻana o ka mea ʻike i ka māmā ma muli o ka hoʻololi ʻana o ka hoʻihoʻi ʻana o ka mālamalama. Loaʻa i ka hale helu hoʻokahi ka maikaʻi o ke kumukūʻai haʻahaʻa, ka hana maʻalahi, kiʻekiʻe sampling rate a me ka manawa maoli i ka hana hou ʻana o ka hōʻailona acoustic e like me ka manaʻo o ka detector photocurrent, akā ʻo ka hopena speckle laser e hoʻopau i ka pilina laina ma waena o ka vibration a me ka ikaika o ka māmā detector. , no laila ke kaohi ʻana i ka hoʻohana ʻana i ka ʻōnaehana ʻike hoʻokaʻawale ʻole. Hoʻokumu hou ka ʻōnaehana hoʻonohonoho i ka haʻalulu ili o ka pahu hopu ma o ka algorithm hoʻoponopono kiʻi kikoʻī, i hiki ai i ka ʻōnaehana ana haʻalulu ke hoʻololi i ka ʻili o ka ʻili, a ʻoi aku ka pololei a me ka naʻau.

二. ʻOkoʻa ka ʻōnaehana ʻike interference mai ka bluntness ʻike ʻole, ʻoi aku ka maikaʻi o ka ʻike interference, ʻo ke kumumanaʻo ma o ka laser irradiation o ka ʻili o ka mea i hoʻopaʻa ʻia, ka ʻili i hoʻopaʻa ʻia ma ka axis optical o ka neʻe ʻana i ke kukui hope. hoʻolauna i ka hoʻololi ʻana o ka pae/frequency, ka hoʻohana ʻana i ka ʻenehana interference e ana i ka neʻe ʻana o ke alapine / ka hoʻololi ʻana i ka pae no ka loaʻa ʻana o ke ana micro-vibration mamao. I kēia manawa, hiki ke hoʻokaʻawale ʻia ka ʻenehana ʻike interferometric ʻoi aʻe i ʻelua ʻano e like me ke kumu o ka ʻenehana ana ʻana i ka ʻenehana Doppler vibration a me ke ʻano hana interference hoʻohuihui laser e pili ana i ka ʻike hōʻailona acoustic mamao. Hoʻokumu ʻia ke ʻano o ka ana ʻana i ka vibration Laser Doppler ma ka hopena Doppler o ka laser e ʻike i ka hōʻailona kani ma ke ana ʻana i ka hoʻololi pinepine Doppler i hoʻokumu ʻia e ka haʻalulu o ka ʻili o ka mea i hoʻopaʻa ʻia. ʻO ka laser self-mixing interferometry technology e ana i ka neʻe ʻana, ka wikiwiki, ka haʻalulu a me ka mamao o ka mea i hoʻopaʻa ʻia ma o ka ʻae ʻana i kahi ʻāpana o ka mālamalama i hōʻike ʻia o ka pahuhopu mamao e hoʻokomo hou i ka resonator laser a hoʻololi i ka modulation o ka amplitude a me ke alapine laser. Aia kona mau pono i ka liʻiliʻi liʻiliʻi a me ka naʻau kiʻekiʻe o ka ʻōnaehana ana vibration, a me kalaser mana haʻahaʻahiki ke hoʻohana ʻia e ʻike i ka hōʻailona kani mamao. Hōʻike ʻia ma ke Kiʻi 2 kahi ʻōnaehana ana ʻana i ka ʻōnaehana hoʻohuihui ponoʻī laser no ka ʻike ʻana i ka hōʻailona leo mamao.

FIG. 2 Kiʻikuhi kiʻi o ka ʻōnaehana ana ʻana i ka ʻōnaehana hoʻohuihui ponoʻī laser

Ma ke ʻano he ʻenehana pono a me ka maikaʻi, hiki i ka laser "magic" ke pāʻani i ka ʻōlelo mamao ʻaʻole wale ma ke kahua o ka ʻike, ma ke kahua o ka counter-detection kekahi hana maikaʻi loa a me ka hoʻohana ākea - laser interception countermeasure technology. Hiki i kēia ʻenehana ke hoʻokō i nā countermeasures interception pae 100-mika i loko o ka hale, nā hale keʻena a me nā wahi pā pale aniani ʻē aʻe, a hiki i kahi mea hoʻokahi ke pale pono i kahi lumi hālāwai me kahi puka aniani o 15 mau mika square, me ka wikiwiki o ka pane wikiwiki ʻana. a me ka hoʻonohonoho ʻana i loko o 10 kekona, ʻoi aku ka pololei o ke kūlana kiʻekiʻe ma mua o 90% ka nui o ka ʻike, a me ka hilinaʻi kiʻekiʻe no ka hana paʻa lōʻihi. Hiki i ka ʻenehana countermeasure laser interception ke hāʻawi i kahi hōʻoia ikaika no ka palekana ʻike acoustic o nā mea hoʻohana ma nā keʻena ʻoihana koʻikoʻi a me nā hiʻohiʻona ʻē aʻe.