Yini iseli yomthwalo?
I-Wheatstone bridge circuit (manje esetshenziselwa ukukala ubunzima ebusweni besakhiwo esisekelayo) yathuthukiswa futhi yaduma kakhulu nguSir Charles Wheatstone ngo-1843 yaziwa kakhulu, kodwa i-vacuum yamafilimu amancanyana afakwe kule sekhethi endala evivinyiwe futhi ehloliwe. okwamanje. Izinqubo zokufakwa kwe-sputter yefilimu ezacile aziyona into entsha embonini. Le nqubo isetshenziswa ezinhlelweni eziningi, kusukela ekwenzeni ama-microprocessors ayinkimbinkimbi kuya ekwenzeni izithasiselo ezinembayo zamageji ohlobo. Emagajini ohlobo lwe-strain, amageji efilimu emincane ehluzekile efafazwe ngqo ku-substrate ecindezelekile inketho eqeda izinkinga eziningi ezibhekene "namagaji ohlobo oluhlanganisiwe" (owaziwa nangokuthi ama-foil gages, amageji ohlobo olumile, namageji ohlobo lwe-silicon) .
Kusho ukuthini ukuvikelwa kokulayisha ngokweqile kweseli yomthwalo?
Iseli ngalinye lomthwalo liklanyelwe ukuphambukisa ngaphansi komthwalo ngendlela elawulwayo. Onjiniyela balungiselela lokhu kuchezuka ukuze bakhulise ukuzwela kwenzwa ngenkathi beqinisekisa ukuthi isakhiwo sisebenza ngaphakathi kwesifunda saso "esinwebekayo". Uma umthwalo usususiwe, isakhiwo sensimbi, esichezukile nesifunda saso esinwebekayo, sibuyela esimweni saso sokuqala. Izakhiwo ezedlula lesi sifunda esinwebekayo zibizwa ngokuthi “zilayishwe ngokweqile”. Inzwa elayishwe ngokweqile idlula "i-plastic deformation," lapho isakhiwo siguga unomphela, singabuyeli esimweni saso sokuqala. Uma ikhubazekile ngokwepulasitiki, inzwa ayisanikezeli ngokuphuma komugqa ngokulingana nomthwalo osetshenzisiwe. Ezimweni eziningi, umonakalo unomphela futhi ongalungiseki. I-“Overload Protection” isici somklamo esikhawulela ngokuzenzakalelayo ukuchezuka okuphelele kwenzwa ngaphansi komkhawulo wayo obalulekile womthwalo, ngaleyo ndlela kuvikelwe inzwa emithwalweni engalindelekile emile noma eguquguqukayo ebingase ibangele ukuwohloka kwepulasitiki .
Indlela yokunquma ukunemba kweseli yomthwalo?
Ukunemba kwenzwa kukalwa kusetshenziswa imingcele yokusebenza ehlukene. Isibonelo, uma inzwa ilayishwa ekulayisheni kwayo okuphezulu, bese umthwalo uyasuswa, ikhono lenzwa lokubuyela ekuphumeni okufanayo kwe-zero-load kuzo zombili izimo kuyisilinganiso "se-hysteresis". Amanye amapharamitha afaka i-Nonlinearity, Repeatability, ne-Creep. Ipharamitha ngayinye ihlukile futhi inephutha layo lephesenti. Sibhala yonke le mingcele kumininingwane. Ukuze uthole incazelo enemininingwane yobuchwepheshe yale migomo yokunemba, sicela ubheke uhlu lwethu lwamagama.
Ingabe unazo ezinye izinketho zokuphumayo zamaseli akho omthwalo nezinzwa zokucindezela ngaphandle kwe-mV?
Yebo, amabhodi okulungisa amasignali angaphandle kweshalofu ayatholakala ngamandla afinyelela ku-24 VDC futhi izinhlobo ezintathu zezinketho zokukhiphayo ziyatholakala: 4 kuya ku-20 mA, 0.5 kuya ku-4.5 VDC noma i-I2C yedijithali. Sihlala sihlinzeka ngamabhodi athengiswayo futhi alinganiswe ngokugcwele ukuze abe nezinzwa zomthwalo omkhulu. Izixazululo ezenziwe ngokwezifiso zingathuthukiswa zanoma iyiphi enye iphrothokholi yokuphumayo.
Isikhathi sokuthumela: May-19-2023
