
holographic interferometry

optikkalaayi parukkan prathalangalulla vasthukkalude staatik, dynamic sthaanachalanangal opttikkal interferometric krithyatha (i.iii. prakaashatthinte tharamgadairkhyathinte bhinnasamkhyakalilekku). eee alavukal sammarddam, strain, vibration vishakalanam, athupole thanne noonn-distractive testing, radiation dosimetry ennivaykku prayogikkaam. sutharyamaaya maadhyamangalile opttikkal paatha dairkhya vyathiyanangal kandethaanum ithu upayogikkaam, ithu udaaharanathinu, draavaka ozhukk drishyavalkkarikkaanum vishakalanam cheyyaanum prapthamaakkunnu. uparithalathinte roopathe prathinidheekarikkunna kondoorukal srishtikkaanum ithu upayogikkaam.
oru vasthuvil ninnu chitharikkidakkunna oru defracted laitt feeld record cheiyunnathinum imej rendering nadathunnathinumulla rund ghatta prakriyayaan holography. parambaraagatha photographic plettukal upayogicho digital sensor shreni upayogicho digital holography eee prakriya nedaanaakum. rekhappeduthiya feeld vasthuvil ninnu chitharikkidakkunna "live feeldil" superimpose cheythittundenkil, rund feeldukalum samanamaayirikkum. ennirunnaalum, oru cheria vaikalyam vasthuvil prayogikkukayaanenkil, rund prakasha mandalangalude aapekshika gattangal maarukayum edapedal nireekshikkaan kazhiyukayum cheyyum. eee saankethikavidyaye live holographic interferometry ennu vilikkunnu.
ore recording maadhyamathil vasthuvil ninnu chitharikkidakkunna prakaashakshethrathinte rund recordingukal nadathunnathiloode arikukal nedaanum kazhiyum. punarnirmmicha prakaashakshethrangal pinneedu uparithalathinte sthaanachalanathe mapp cheiyunna arikukal nalkunnathinu idayaakkaam. ithine "phroosan frinch" holography ennu vilikkunnu.
franch paatteninte roopam uparithala sthaanathilo vaayuvinte sankeernathayilo undaakunna mattangalumaayi bandhappettirikkunnu.
atharam paattenukal yaanthrikamaayi vishakalanam cheiyunnathinulla niravadhi reethikal sameepa varshangalil vikasippicheduthittundu.
kandethal.
1965ll niravadhi gaveshana samghangal holographic interferometry vivarikkunna prabandhangal prasidheekarichu. 
holographic interferometriyumaayi bandhappeduthaavunna prathibhaasangalekkurichu aadya nireekshanangal 1963 ll juris upaathnikkukal nadathiyappol, povelinteyum stetsaninteyum pravartthanam vare eee prakriyayude pradhana savisheshatha manassilakkaanaayilla. 1964 october muthal desember vareyulla kaalayalavil avarude pareekshanangal nadathukayum heine laserinte periodic coherance dairkhyathekkurichulla anweshanathode avaa aarambhichu. oru cheria vasthuvil oru spaat prakaashippikkaan compact lazer beam upayogichu, rund kannadikalkkidayil sthaapichu, athinte chithram oru kannaadiyiloode kannaadikalkkidayilulla onniladhikam prathiphalanangalude thurankathilekku nokkunnathu nireekshikkaan kazhiyum. oro chithrathinum mumbathethinekkaal 10 centimeter kooduthal paathayude neelam undaayirunnu. eee laserukalkku ekadesham moonnu rekhamsha modukal ullathinaal, avayude coherance dairkhyam perkin elmer korppareshanumaayi sahakarichu nirmmaathaav vivarichathupole spectra physics aavarthichullathaayirunnu. kannadikalilonninu mukalilulla kaazhchayude oru hologram record cheythaanu ithu prakadamaakkiyathu.
ennirunnaalum, holograamukalilonnil, holograminode ettavum aduthulla chithratthil oru irunda baand nireekshikkappedukayum athu kazhchappadinoppam sthaanam mattunnathaayi nireekshikkappedukayum cheythu. eee baand yadhaartha lazer beam nireekshikkaanaavaathinaal holographic prakriya srishticha onnayirikkanam. konfokkal lazer arayil outtputtu attathu oru golaakrithiyilulla kannadiyum maruvashathu vakrathayude kendratthil oru paranna kannadiyum ulppedunnu. rekhamsha akalatthinte krameekaranam oof-axis modukalude ennam niyanthrikkukayum lazer onniladhikam axis modil aandolanamundaakkunnathayi nireekshikkukayum cheythu. onniladhikam lazer modukal poruthappedaatthathum nireekshikkaavunna lazer beam thadassappeduthaathathum aayathinal avaa hologram punarnirmmaanatthil edapedunnathu enthukondu? oro mode objectilum reference beemyilum nilavilundenna ashayam stetsan munnottuvachu, oro jodiyum photographic plettil oru prathyeka hologram record cheythu. iva punarnirmmichappol, rund recordingukalum ore lazer beam upayogichu oresamayam punarnirmmikkukayum feeldukal parasparam yojikkukayum cheythu. holograaminu athinte recordinginide poruthappedaattha feeldukal yojicha reethiyil punarnirmmikkanulla adhikaaramundenn soochippikkunnathinaal powell eee ashayathe ethirthu.
thathfalamaayundaaya vaadangal pinneedu 1966-ll prasidheekaricha oru koottam pareekshanangalkk kaaranamaayi. avayil iva ulppedunnu (1) holograamile muzhuvan reference beam pidichedukkumbol oru kendreekritha lazer beam reflection record cheyyukayum oof-axis modukalude kombineshanukalkkaayi lazer krameekarikkukayum cheyyuka. (2) vasthu, reference beam mirror, hologram enniva eksposharukalkkidayil cheruthaayi karangunna oru vasthuvinte eratta-exposure holograamukal record cheyyuka. (3) oru 35 emm philim kyaaninte thaazhathe holograamukal athu vibrate cheyyumbol record cheiyunnu. pinneedu, 1965 eprilil, stetsanum povalum oru yadhaartha vastuvinum athinte holographic punarnirmmaanatthinum idayil thalsamaya edapedal paattenukal nedi.
aaplikkeshanukal.
lazer vibrometry.
athinte aamukham muthal, holographic interferometry vazhi vibrometry saadhaaranamaayitheernniriknu. oru vibrating objectinte samaya sharashari hologram franchukal bezel function formula _ 1 nte poojyangalumaayi poruthappedunnuvennu pavalum stetsanum theliyichittundu, ivide formula _ 2 ennathu objectile formula _ 3 leeii opttikkal feeldinte phase moduleshante modulation depthanu. eee reethi upayogichu, praadeshika vibration amplitude frinch counting vazhi vilayiruthaan kazhiyum. alexphoph report cheytha kruthiyil, oordar formula _ 4-nte oru sideband thiranjedukkunnathinaayi reference beam freekwansiyil maatti. anganeyaanengil, sideband formula _ 4-nulla arikukal bezel function formula _ 6-nte poojyangalumaayi poruthappedunnu. freekwansi sidebandukalude thudarchayaaya imaging vazhi, frinch kaundinginte prashnam laghookarichu. sinusoidal outtu-oof-playin chalanatthinte praadeshika aamplityoodinte adayaalamaanu side baand oordar. opttikkal sidebandukalude multiplexed alavukal opttikkal tharamgadairkhyathekkaal valare cheruthaanu.
lazer doppler imaging.
oof-axis konfigareshanil, slow camera lazer diode ulla holographic interferometry wide feeld, lazer doppler imaging amplitudilum ghattathilum opttikkal ettakkurachilukal praapthamaakkaan paryaapthamaan, onnukil slow allengil phaast camera upayogichu. oru mandagathiyilulla (udha.jii. viidiyoo rettu) camera samaya-sharashari holographic interferograamukal record cheyyum, ithu opttikkal fluctuation signalinte loow paas filteringinu kaaranamakum. reference beam freekwansi maattunnathiloode, lopas filter detuning freekwansi kendreekarichulla oru bandpass filteraayi maarunnu, koodaathe selective naroband ditakshanum imajing nadatthaam. eee reethi microvascular raktapravaaha imajing, plaininu purathulla tissue chalanam kandethunnathiloode photoplethysmogramude wide feeld alakalum anuvadikkunnu. uyarnna throoput camerayude vishalamaaya thaalkkaalika bandwidthinu wideband kandethunnathinum opttikkal ettakkurachilukalude vishakalanathinum kazhiyum. pulsettail raktapravaaha imajinginu ithu upayogikkaam.

