Besisenza izigaba ezisebenzisa amandla esandla nezisebenzisa iimoto kangangeminyaka engaphezu kwe-9. Sithethe nabathengi abaninzi. Uninzi lwabo luqala ngomgama wokuhamba kunye nexabiso. Yinto eqhelekileyo leyo. Kodwa emva koko bafumana ingxaki. Isigaba sihamba kakuhle. Amanani abonakala elungile. Sekunjalo ulungelelwaniso alusayi kuhlala.
Izihlandlo ezilithoba kwezilishumi, ingxaki ayingo-X, Y, okanye Z. Yi-pitch, roll, kunye ne-yaw.
Impazamo encinci ye-angular inokubulala iziphumo zakho. Akunamsebenzi nokuba isikrufu silungile kangakanani na. Akunamsebenzi nokuba isilayidi sivakala sigudile kangakanani na. Ukuba iqonga liyathambekela okanye liyajika, ithagethi yakho iyahamba. Kwaye okukhona ithagethi yakho ikude, kokukhona isiya isiba sibi kakhulu.
Le bhlog yenzelwe abathengi kunye neenjineli abafuna iimpendulo ezithe ngqo. Siza kuyigcina ilula. Siza kusebenzisa amanani okwenyani. Siza kukubonisa nalaphoinqanaba lokulungelelanisa ngesandlaifanelekile, xaIndawo yokubeka ngesandla ye-axis ezi-3inqanaba lanele, kwaye xa udingainqanaba lokufuduka kwe-angular.
Iimpazamo ze-Angle zikhula ngomgama
Masiqale ngento enye abathengi abaninzi abayiphoswayo.
Impazamo encinci ye-engile ayihlali incinci. Ijika ibe yimpazamo enkulu ethe tye njengoko umgama usanda.
Ifomula ilula:
Impazamo yomgca = i-engile kwiirediyani × umgama
Nantsi itheyibhile emfutshane. La manani ayinyani. Ungawasebenzisa ngexesha lokukhetha.
| Impazamo ye-angular | Kwi-100 mm | Kwi-200 mm | Kwi-300 mm | Kwi-500 mm |
| 0.01° | 17.5 µm | 34.9 µm | 52.4 µm | 87.3 µm |
| 0.05° | 87.3 µm | 174.5 µm | 261.8 µm | 436.3 µm |
| 0.1° | 174.5 µm | 349.1 µm | 523.6 µm | 872.7 µm |
| 0.5° | 872.7 µm | 1,745 µm | 2,618 µm | 4,363 µm |
| 1° | 1,745 µm | 3,491 µm | 5,236 µm | 8,727 µm |
Ngoku cinga ngomsebenzi wakho. Ukuba ulungelelanisa ifayibha kwi-200 mm, kwaye inqanaba lakho liyi-0.1° ye-yaw, udlula malunga ne-349 µm. Kwifayibha yemowudi enye, loo nto inkulu kakhulu. Umbindi umalunga ne-9 µm kuphela. Awusoze ufumane i-coupling elungileyo.
Yiyo loo ntoinqanaba lokulungelelanisa ngesandlaayikokuhamba ngomgca kuphela, ikwakukulawula ii-engile.
I-Pitch, Roll, kunye ne-Yaw zichaphazela njani ukuchaneka kweSigaba soLungiselelo lweManual?
Lo ngumbuzo esiwuva kakhulu. Masiwuchaze ngaphandle kolwimi oluyintsomi.
Ukutsiba, ukuqengqeleka, kunye nokubhonga ziindlela ezintathu kuphela iqonga elinokujikeleza ngazo xa ungafuni.
| Intshukumo | Oko ikwenzayo | Oko ukubonayo |
| Iphimbo | Impumlo phezulu okanye ezantsi | Umqadi uya phezulu/ezantsi kwindawo ekujoliswe kuyo |
| Roll | Iingcebiso ekhohlo okanye ekunene | Umqadi uhamba ngasekhohlo/ngasekunene kwindawo ekujoliswe kuyo |
| Yaw | Ijika ijika ibe tye ngasekhohlo okanye ngasekunene | Umqadi uyajika okanye ujikeleze |
| ITheta | Ukujikeleza ujikeleze u-Z | Utshintsho lwe-engile yecandelo |
Kwiinqanaba lokulungelelanisa ngesandla, ezi mpazamo zivela kwiindawo ezininzi. Iibheringi. Izikrufu. Ukuthamba. Ukudibanisa. Umthwalo. Ukutshixa. Ubushushu. Kwanomqhubi.
Ipitch idla ngokulimaza ukuphakama. Ukuqengqeleka kudla ngokulimaza indawo esecaleni. I-Yaw idla ngokuba yeyona imbi kakhulu kwi-optics. Ingajikelezisa ilensi, iprism, okanye isibuko. Oko kutshintsha indlela ye-beam. Ingenza nokudibanisa okunqamlezileyo. Ulungisa u-X. Emva koko u-Y. Emva koko uqaphela ukuba ukuthambeka kuvaliwe. Ulungisa ukuthambeka. Ngoku u-X no-Y bavaliwe kwakhona. Oko kubuyela umva nokuya phambili kuchitha ixesha.
Sibone oku kwiiprojekthi zokwenyani. Umthengi uthenge inqanaba le-3-axis elingabizi kakhulu. Lalinesisombululo esihle somgca. Kodwa impazamo ye-yaw yayingaphezulu kwe-0.2°. Kwi-300 mm, oko kungaphezulu kwe-1 mm yokutshintsha ecaleni. Bachithe iintsuku ezimbini bezama ukulungelelanisa useto lwe-laser olulula. Ekugqibeleni, bongeze iinqanaba lokufuduka kwe-angularIngxaki isonjululwe kwiyure enye.
Yintoni ebangela impazamo ye-Angular kwiZigaba zokwenyani
Awunakulungisa into ongayiqondiyo. Nazi izizathu eziqhelekileyo esizibonayo.
1. Impazamo yokuba tyaba.
Ukuba ipleyiti ephezulu ayithe tyaba, umthwalo uyathambeka. Impazamo yokuthambeka eyi-10 µm ngaphezulu kwe-100 mm inokudala malunga nemizuzwana engama-20 yokuthambeka. Oko kwanele ukuba kubalulekile.
2. Ukususwa kweebheringi.
Iibheringi zebhola kunye neeslayidi zedovetail zivulekile. Ukuvula kakhulu kuthetha ukuba iqonga liyashukuma. Oko kubonakala njengepitch and roll.
3. Ulungelelwaniso lwezikrufu kunye neenathi.
Isikrufu se-lead okanye intloko ye-micrometer ingatyhala iqonga nge-engile encinci. Oko kudala ukukhwaza. I-nut engalunganga yongeza umva kunye nokutyibilika kwe-stick.
4. Impazamo yokuhlanganisa.
Iindawo ezilungileyo zinokuhlanganiswa kakubi. Ukuba iireli azihambelani, iqonga liyabophana. Ukuba ipleyiti ephezulu ayibekwanga phantsi, umthwalo uyathambeka.
5. Umthwalo ongaphandle kwesikhungo.
Umthwalo we-5 kg obekwe kwi-50 mm ukusuka embindini udala umzuzu. Loo mzuzu ugoba iqonga okanye ucinezele icala elinye. Ukugoba nokuqengqeleka kuya kuba kubi.
6. Ishifti yokutshixa.
Amanqanaba amaninzi asetyenziswa ngesandla asebenzisa i-clamp okanye i-screw yokuseta ukutshixa. Ukuba i-lock ityhala iqonga, ulungelelwaniso lwakho luyashukuma. I-lock elungileyo iyabamba ngaphandle kokushukuma.
7. Utshintsho lobushushu.
I-aluminiyam ikhula malunga ne-23 µm ngemitha nganye nge-°C. Intsimbi imalunga ne-11 ukuya kwi-13 µm. Utshintsho lwe-2°C kwisigaba se-aluminiyam esingama-200 mm lunokuhambisa inqaku malunga ne-9 µm. Ekuhambeni kwexesha, oko kukuhambahamba.
8. Amandla omqhubi.
Izigaba ezenziwa ngesandla zixhomekeke kumqhubi. Tyhala kakhulu, uze ujike iqonga. Jika ngokukhawuleza kakhulu, uze ujike kakhulu. Uqeqesho lubalulekile.
| Umthombo wempazamo | Isiphumo esiqhelekileyo se-angular | Indlela yokuyinciphisa |
| Impazamo yokuba tyaba | 5 ukuya kuma-50 arcsec | Cacisa ukuba ithambile, sebenzisa iindawo ezijikelezileyo |
| imvume yeebheringi | 10 ukuya kwi-100 arcsec | Sebenzisa iibheringi ezifakwe kwangaphambili |
| Ukungalingani kwezikrufu | 5 ukuya kwi-30 arcsec | Sebenzisa izikrufu ezincinci, lungelelanisa amantongomane |
| Umthwalo ongaphandle kwesikhungo | 10 ukuya kwi-200 arcsec | Umthwalo osembindini, yonyusa ukuqina |
| Ishifti yokutshixa | 5 ukuya kuma-50 arcsec | Sebenzisa izikhiya ezisebenza kancinci |
| Ukushukuma kobushushu | 1 ukuya kwi-20 arcsec nge °C nganye | Izinto eziphantsi kwe-CTE, igumbi elizinzileyo |
| Amandla omqhubi | 10 ukuya kwi-100 arcsec | Sebenzisa amaqhosha, abaqhubi bezitimela |
Isigaba sokuBeka i-Axis Manual esi-3 vs. i-Angular Displacement Stage
Ngoku makhe sithelekise iindlela ezimbini eziqhelekileyo zokukhetha. Kulapho abathengi badla ngokubhajwa khona.
A Indawo yokubeka ngesandla ye-axis ezi-3Isigaba sikunika intshukumo ethe tye ye-X, Y, kunye ne-Z. Ilungele ukuhambisa isampulu okanye isixhobo esithubeni. Ilula. Ifikeleleka ngexabiso eliphantsi. Isebenza kakuhle ekuhlolweni, kwizikhululo zokuhlola, nakwiindawo ezisisiseko.
An inqanaba lokufuduka kwe-angularilawula ukujikeleza. Ingaphatha i-pitch, i-roll, i-yaw, okanye i-theta. Abanye bayibiza ngokuba yi-tip/tilt stage. Abanye bayibiza ngokuba yi-rotation stage. Isetyenziswa xa i-engile yenxalenye ibaluleke kakhulu njengendawo yayo.
| Uphawu | Indawo yokuBeka ngesandla ye-Axis ezi-3 | Inqanaba lokuFuduka kwe-Angular |
| Intshukumo ephambili | X, Y, Z umgca othe tyaba | Pitch, roll, yaw, theta |
| Eyona ilungileyo kwi | Ukufudusela inxalenye kwindawo ethile | Ukuseta ukuthambeka okanye ukujikeleza |
| Isisombululo esiqhelekileyo | 1 µm ukuya kwi-10 µm | I-arcsec e-1 ukuya kwi-arcmin e-1 |
| Ukusetyenziswa okuqhelekileyo | Iprobe, isixhobo, i-optics elula | I-laser, ifayibha, ikhamera, iprism |
| Umngcipheko wokudibana okudibeneyo | Phakathi ukuya phezulu ukuba yenziwe kakubi | Isezantsi ngoyilo oluhle |
| Ixabiso | Ezantsi | Phakathi ukuya phezulu |
| Ijika lokufunda | Kulula | Iphakathi |
| Umthamo womthwalo | Ihlala iphezulu | Ihlala iphantsi |
Ngoko ke yeyiphi oyifunayo? Kuxhomekeke kuhlahlo-lwabiwo mali lwakho lweempazamo.
Ukuba injongo yakho inkulu kwaye umgama umfutshane,Indawo yokubeka ngesandla ye-axis ezi-3inqanaba linokwanela. Ukuba ithagethi yakho incinci kwaye umgama mde, udinga ulawulo lwe-angular. Kwimisebenzi emininzi yokwenyani, udinga zombini. Sebenzisa inqanaba le-3-axis ukuze ubeke kwindawo eqinileyo. Emva koko sebenzisa i-inqanaba lokufuduka kwe-angularukuze kuthambeke kwaye kujikelezwe okokugqibela.
Musa ukubuza, “Yeyiphi engcono?” Buza, “Impazamo yam ivela phi?” Ukuba ivela ekuthambekeni, thenga ulawulo lokuthambekela. Ukuba ivela kwindawo, thenga ulawulo oluthe ngqo.
Ulungelelwaniso lweCandelo le-Optical kunye neSigaba soLungelelaniso lweManual
Makhe sijonge isicelo sokwenyani:Ulungelelwaniso lweCandelo le-Optical kunye neSigaba soLungelelaniso lweManual.
Umsebenzi wokujonga awuxoleli. Ilensi, isibuko, ifayibha, okanye isenzi sekhamera kufuneka sibe kwindawo efanelekileyo nakwi-engile elungileyo. Ii-microns ezimbalwa ziyacima, kwaye isignali iyawa. I-engile encinci iyacima, kwaye umqadi uyahamba.
Nazi ezinye zemisebenzi eqhelekileyo kunye nezinto abazidingayo.
| Isicelo | Ukunyamezelana okuthe ngqo | Ukunyamezelana kwe-engile | Ukuseta okucetyiswayo |
| Ukudibanisa ifayibha yemowudi enye | < 1 µm ukuya kwi-5 µm | < 0.01° | Isigaba sokulungelelanisa ngesandla se-axis ezi-5 okanye ezi-6 |
| I-diode yelaser ukuya kwilensi | 5 µm ukuya kwi-20 µm | < 0.05° | Indawo yokuma ngesandla ye-axis ezi-3 + incam/ukuthambeka |
| Ukugxila kwimodyuli yekhamera | 10 µm ukuya kwi-50 µm | < 0.1° | Indawo yesandla ye-axis ezi-3 + ukujikeleza |
| Ulungelelwaniso lwePrism | 20 µm ukuya kwi-100 µm | < 0.02° | Isigaba sokufuduka kwe-angular + isigaba esithe ngqo |
| Ukulungelelaniswa kokukhweliswa kwesibuko | 50 µm ukuya kwi-200 µm | < 0.01° | Inqanaba lokuthambeka/lokujika elinezikrufu ezincinci |
| Ulungelelwaniso lwe-Fiber array | 1 µm ukuya kwi-10 µm | < 0.02° | Isigaba sokulungelelanisa ngesandla se-multi-axis |
Kukho into oyiqapheleyo? Ukunyamezelana kwe-angular kudla ngokuba nzima kunokunyamezelana okuthe ngqo. Oko akuyompazamo. Kwi-optics, iimpazamo ze-angle ziyakhula ngomgama. Impazamo ye-0.01° kwi-500 mm imalunga ne-87 µm. Loo nto ingaba ngumahluko phakathi kwesignali enamandla kunye nokungabikho kwesignali.
Kumsebenzi wokukhanya, kulungileinqanaba lokulungelelanisa ngesandlakufuneka zibe nezikrufu ezincinci, i-backlash ephantsi, ukuqina okuphezulu, uzinzo oluhle lobushushu, kunye nesitshixo esingashukumisi iqonga. Ukuba iqonga lineebheringi ezikhululekileyo okanye isinyithi esithambileyo, uza kulwa nalo imini yonke.
Umzekelo olula woMthengi
Masithi kufuneka ulungelelanise umqadi welaser kwisixhobo sokubona. Isixhobo sokubona sikumgama we-300 mm. Umqadi kufuneka uhlale ngaphakathi kwe-50 µm. Kufuneka ulungise ukuthambekela kwelensi. Uhlahlo lwabiwo-mali lwakho luphakathi. Ufuna ukusebenzisa isandla, hayi injini.
| Imfuneko | Ixabiso | Ithetha ukuthini |
| Umgama wokusebenza | 300 mm | Iimpazamo ze-Angle zikhula ngomgama |
| Ukunyamezelana okuthe ngqo | 50 µm | Ndifuna u-X, u-Y, u-Z olungileyo |
| Ukunyamezelana kwe-engile | 0.01° | Malunga ne-36 arcsec iyonke |
| Umthwalo | 1 kg | Umthwalo olula |
| Ii-axes zohlengahlengiso | X, Y, Z, incam, ukuthambekela | Ii-axes ezi-5 zizonke |
| Ukutshixa | Akufuneki utshintshe | Kufuneka i-Low-shift lock |
Kulo msebenzi, kululaIndawo yokubeka ngesandla ye-axis ezi-3inqanaba lisenokunganeli. Udinga ulawulo lwe-angular. Ukhetho olungcono linqanaba le-3-axis kunye ne-tip/tiltinqanaba lokufuduka kwe-angularUkuba uhlahlo lwabiwo-mali luyavuma, inqanaba lokulungelelanisa ngesandla le-5-axis ligcina indawo kwaye linciphisa ukudibana okudibeneyo.
| Ukhetho | Iingcali | Iingxaki | Eyona ilungileyo kwi |
| Indawo yokubeka ngesandla ye-axis ezi-3 kuphela | Ixabiso eliphantsi, elilula | Akukho lawulo lokuthambeka | Iithagethi ezinkulu, umgama omfutshane |
| I-axis ezi-3 + incam/ukuthambeka | Ibhalansi elungileyo | Ixesha elingakumbi lokuseta | Ulungelelwaniso oluninzi lwe-optical |
| Isigaba sokulungelelanisa ngesandla se-axis ezi-5 | Incinci, ayidibani kangako | Ixabiso eliphezulu | Ifayibha, i-laser, ikhamera |
| Isigaba sokulungelelanisa ngesandla se-axis ezi-6 | Ulawulo olupheleleyo | Eyona ibiza kakhulu | Ii-optics ezintsonkothileyo, i-R&D |
| Isigaba sokufuduka kwe-angular kuphela | Eyona ilungele ukuthambekela | Akukho hambo oluhamba ngomgca | Iprism, isibuko, ukujikeleza |
Iinkcukacha Ezibaluleke Ngakumbi KunokuThengisa
Xa uthelekisa izigaba, musa ukufunda nje iphepha lokuqala. Khangela amanani okwenyani.
| Inkcazo | Kutheni kubalulekile | Uphawu oluhle | Isilumkiso |
| Uluhlu lokuhamba | Ifanela uhlengahlengiso lwakho | Uhambo olucacileyo lwe-X, Y, Z | "Uhambo olukhulu" olungacacanga |
| Isisombululo | Inyathelo elincinci | 1 µm okanye ngaphezulu komgca othe tye | "Isisombululo esiphezulu" kuphela |
| Ukuphindaphinda | Buyela kwindawo enye | < 2 µm | Ayidweliswanga |
| Isisombululo se-angular | Inyathelo elincinci lokuthambekela | < 10 imizuzwana ye-arc | Ayidweliswanga |
| Ukusabela okubi | Intshukumo elahlekileyo | < 2 µm | "Ukusabela okuphantsi" kuphela |
| Ukuthe tye | Iphuma kumgca | < 3 µm kwi-25 mm nganye | Ayidweliswanga |
| Ukuthe tyaba | I-Top ihlala iflethi | < 5 µm | Ayidweliswanga |
| Ukuqina | Ibamba phantsi komthwalo | Idatha yovavanyo | Akukho migca ijikiweyo |
| Umthamo womthwalo | Ngaba iza kudilika? | 5 kg, 10 kg, okanye ngaphezulu | Akukho nombolo |
| Ukutshixa | Ingaba iyatshintsha? | Uyilo olusebenza kancinci | Isikrufu esilula |
Umthengisi olungileyo ukunika amanani. Umthengisi obalaseleyo uyakunceda uwavavanye kwisicelo sakho.
Iingcebiso ezikhawulezayo zokunciphisa isandi, ukuqengqeleka, kunye nokugoba
Ungathenga iqonga elihle kodwa ufumane iziphumo ezimbi. Indlela oyisebenzisa ngayo ibalulekile.
Nciphisa umgama osebenzayo ukuba unako. Kwi-100 mm, impazamo ye-0.1° yi-175 µm. Kwi-500 mm, yi-873 µm.
Sebenzisa inqanaba elifanelekileyo kwi-axis elungileyo. Musa ukulungisa ingxaki ye-engile ngenqanaba elithe ngqo.
Lungelelanisa kakuhle ukuze kube lula. Kuqala kushukume izinto ezinkulu. Izikrufu ezincinci ziyaphela.
Beka umthwalo embindini. Ubunzima obungaphandle kwembindi bubangela isandi sokutyibilika nokuqengqeleka.
Tshixa i-axis enye ngexesha. Jonga indawo emva kwesitshixo ngasinye.
Ubushushu bolawulo. Utshintsho lwe-2°C lunokuhambisa inqanaba le-aluminiyam engama-200 mm malunga ne-9 µm.
Linganisa ngokuchanekileyo. Sebenzisa i-autocollimator okanye i-electronic level ukuze ufumane ii-engile.
Qeqesha umqhubi. Amandla okukhanya. Icala elifanayo ngalo lonke ixesha.
Imibuzo Omele Uyibuze Umthengisi Wakho
Ngaphambi kokuba uthengeinqanaba lokulungelelanisa ngesandla, buza ezi.
Yintoni i-angular resolution kwi-arcseconds?
Yintoni ephindaphindwayo emva kokutshixa?
Itshintsha kangakanani iqonga xa livaliwe?
Yintoni ukuthe tye kunye nokuthe tyaba?
Ungakanani umthamo womthwalo embindini nangaphandle kwembindi?
Zeziphi izinto ezisetyenziswayo? Yintoni ukwandiswa kobushushu?
Ngaba ungasinika ingxelo yovavanyo lwe-pitch, roll, kunye ne-yaw?
Ngaba ninikezela ngeepateni zokufakelwa ezenziwe ngokwezifiso?
Lithini ixesha lokuqalisaIndawo yokubeka ngesandla ye-axis ezi-3iqonga?
Ungandinceda ndikhethe phakathi kwesigaba se-3-axis kunye nesigaba se-inqanaba lokufuduka kwe-angular?
Ukuba umthengisi akanakukwazi ukuphendula ezi mpendulo, qhubeka ukhangela. Awuthengi mpahla. Uthenga ukusebenza kolungelelwaniso.
Indlela Esinokunceda Ngayo
Sinamava angaphezu kweminyaka eli-9 kwizigaba eziqhutywa ngesandla neziqhutywa ngenjini. Senza izigaba zokulungelelanisa ngesandla, iiplatifomu zokubeka ngesandla ezizi-3 axis, ii-angular displacement stages, kunye neeplatifomu zokulungelelanisa ngokuzenzekelayo. Sigxila kwi-R&D, imveliso, kunye neentengiso.
Ukuba usebenza kwi-optics, i-fiber alignment, iimodyuli zekhamera, okanye izixhobo ezichanekileyo, singakunceda. Sixelele umgama wakho wokusebenza, ukunyamezelana kwethagethi, umthwalo, kunye nee-axes zokulungisa. Siza kucebisa inqanaba elifanelekileyo. Singenza noyilo olukhethekileyo, imizobo, iisampulu, kunye nenkxaso ye-OEM.
Nxibelelana nathi kwiwebhusayithi yethu okanye uthumele i-imeyile kwiqela lethu lokuthengisa. Masifumane elona lifanelekileyoinqanaba lokulungelelanisa ngesandlakwiprojekthi yakho. Musa ukulinda ude uchithe iintsuku ulungelelanisa izinto. Thumela iimfuno zakho namhlanje.
Ilizwi lokugqibela
I-pitch, i-roll, kunye ne-yaw azingomagama ezemfundo. Ziyimithombo yokwenyani yempazamo. I-engile encinci inokubangela ukuphosa okukhulu. Impazamo ye-0.1° kwi-300 mm imalunga ne-524 µm. Impazamo ye-10 arcsec kwi-200 mm imalunga ne-9.7 µm. Umahluko ubalulekile.
Xa ukhetha iqonga, jonga umfanekiso opheleleyo. Ukuhamba ngomgca kubalulekile. Ukusebenza kwe-engile kubaluleke ngokufanayo. Ukuphindaphinda, ukuqina, ukutshixa, kunye nokuzinza kobushushu zonke zidlala indima.
Ukuba uyayidingaIndawo yokubeka ngesandla ye-axis ezi-3, jonga ukuba uyayidinga nainqanaba lokufuduka kwe-angularUkuba wenzaUlungelelwaniso lweCandelo le-Optical kunye neSigaba soLungelelaniso lweManual, nika ingqalelo engakumbi kwisandi kunye nokubhomboloza. Zidla ngokuba zezona zizathu zifihlakeleyo zokuba ukulungelelaniswa kuthathe ixesha elide kakhulu.
Silapha ukukunceda. Ngamava angaphezu kweminyaka eli-9, singakukhokela ukusuka ekukhetheni ukuya kwimveliso. Nxibelelana nathi namhlanje kwaye usixelele into ekufuneka uyilungelelanise. Siza kukunceda uyilungise okokuqala.
Ixesha lokuthumela: Okthobha-09-2026
