Logging Thaum Drilling (LWD) gamma detectors yuav tsum ua haujlwm ruaj khov ntawm 175℃thiab txawm tias kub dua, thiab cov kev cov nyom tau ntsib ntau tshaj qhov yuav daws tau los ntawm qhov yooj yim siab - ntsuas kub ntawm cov khoom siv hluav taws xob. Tag nrho cov saw hlau tshawb pom - los ntawm cov pob zeb ci ntsa iab thiab cov duab hluav taws xob hloov mus rau kev ua cov teeb liab - yuav tsum muaj kev ua tau zoo nyob rau hauv cov xwm txheej ntawm qhov chaw kaw, kev co hnyav thiab kev poob siab, thiab qhov kub thiab txias hloov pauv. Ntau cov kev daws teeb meem uas tau piav qhia hauv cov kev qhia tshwj xeeb ntawm Qingdao ZITN ob lub qauv, ZTFT-A thiab ZTNGT-254, ua qhov zoo tshaj plaws nkag mus rau kev nkag siab txog kev teeb meem hauv daim teb no.
High -Tsev Ntim Tshuab rau Sodium Iodide Crystals
Thallium-activated sodium iodide crystals tseem yog qhov kev xaiv tseem ceeb rau kev tshawb pom LWD gamma tam sim no vim lawv lub teeb pom kev zoo thiab lub zog zoo. Txawm li cas los xij, cov khoom siv zoo li no yog hygroscopic heev, thiab kev nthuav tawm ntawm microcracks tshwm sim los ntawm qhov kub thiab txias yuav txo qis kev sib kis ntawm lub teeb. Kev siv lub qhov rai tshawb pom ua los ntawm cov ntaub ntawv tshwj xeeb ua ke nrog kev tsim vaj tsev tag nrho, ZITN cov khoom tsis tsuas yog paub txog kev xaiv xaiv (tseem ceeb) nrhiav kom pom, tab sis qhov tseem ceeb tshaj, tsim kom muaj kev sib cais ob qho thaiv kev tiv thaiv cov vapor thiab kev ntxhov siab. Tsis pub dhau qhov ntsuas kub ntawm -40℃txog 185 degree, qhov sib piv ntawm thermal expansion coefficients ntawm cov siv lead ua thiab hlau vaj tse, tsis muaj txheej txheem tsim, thiab cov txheej txheem vuam hermetic ncaj qha txiav txim siab qhov ceev ceev ntawm tus ntes tom qab ntau yam kev ua haujlwm.
Tau txais Stabilization Technology rau siab -Tub kub Photomultiplier Tubes
Hamamatsu R3991A photomultiplier tube (PMT) yog qhov sib koom ua ke ntawm ob lub tshuab ntes. PMT nce yog qhov kub thiab txias heev-rhiab heev: txhua txhua 1℃nce hauv qhov kub thiab txias ua rau muaj kev hloov pauv hauv cov hluav taws xob hluav taws xob theem nrab emission coefficient ntawm dynode. Yog tsis muaj kev them nyiaj, qhov tso zis mem tes amplitude ntawm 175℃yuav poob ntau zaus. ZITN cov khoom sib txuas ua ke nrog qhov kub thiab txias network hauv qhov siab -voltage fais fab mov module lossis txais yuav cov lus qhia tawm tswv yim kom ua kom PMT nce tus nqi qis dua qhov kub thiab txias. Raws li qhia los ntawm qhov ntsuas qhov ntsuas ntawm ± 10% qhov tseeb (25℃txog 175 degree), nws qhov kub thiab txias kev ua haujlwm tau mus txog qib ntawm cov khoom siv thoob ntiaj teb LWD.
Tsis muaj teeb liab Extraction thiab Vibration Resistance Design
Lub teeb liab pulse tso zis los ntawm scintillation detectors tsuas yog ob peb microseconds nyob rau hauv dav nrog millivolt - theem amplitude. Nyob rau hauv 20G RMS random vibration thiab 1000G poob siab tej yam kev mob, piezoelectric teebmeem, triboelectric suab nrov, thiab electromagnetic cuam tshuam tau yooj yim overwhelm tiag tiag suav signals. Mechanically, ZITN detectors txais yuav nruj preloading ntawm lub optical coupling interface ntawm crystal- teeb qhia-PMT; nyob rau hauv kev tsim hluav taws xob, luv pulse shaping thiab hloov kho ntawm qhov kev sib cais ntawm kev sib cais yog siv los xyuas kom meej tias qhov ua tau zoo ntawm cov suab nrov qis hauv vibrating ua haujlwm. Tshwj xeeb, ZTFT-Lub ntsuas gamma tsom rau yuav tsum tau teeb tsa ze rau ntawm lub laum me ntsis, nrog rau nws qhov kev poob siab tsis kam hloov mus rau 1000G, uas txhais tau hais tias cov txheej txheem kho siv lead ua sab hauv thiab PMT lub qhov (socket) txhawb cov qauv tau dhau los ua cov qauv tsim tshwj xeeb.
Dav -Voltage Power Management thiab Heat Dissipation Control
Qhov dav input voltage ntau ntawm 10-48VDC qhia tau hais tias tus ntes yog nyob rau hauv kev koom ua ke nrog siab -efficiency DC-DC conversion circuits. Nws yog sib xws nrog cov tsheb npav voltages ntawm qhov sib txawv hauv qab- qhov sib dhos thiab suppresses cov kev hloov pauv ntawm lub hwj chim mov ripple ntawm PMT high voltage. Ntawm 175℃ambient kub, kub drift tswj kev khiav hauj lwm tam sim no yog ib qho tseem ceeb heev. ZTNGT-254 qhia qhov sib txawv tam sim no ntawm 10mA ntawm chav tsev kub piv rau 15mA ntawm 175 degree. Qhov kev hloov maj mam no qhia txog ZITN qhov kev tswj hwm ntawm qhov kub thiab txias tam sim no txoj hauv kev, tiv thaiv qhov ntsuas qhov ntsuas qhov ua haujlwm tsis zoo tshwm sim los ntawm thermal runaway.
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