射頻導納物位計,是一種從電容式物位控製技術發展起來的,防掛料、更可靠、更準確、適用性更廣的物位控製技術,“射頻導納”中“導納”的含義為電學中阻抗的倒數,它由阻性成分、容性成分、感性成分綜合而成,而“射頻”jigaopin,suoyishepindaonajishukeyilijieweiyonggaopinceliangdaona。gaopinzhengxianzhendangqishuchuyigewendingdeceliangxinhaoyuan,liyongdianqiaoyuanli,yijingquecelianganzhuangzaidaicerongqizhongdechuanganqishangdedaona,zaizhijiezuoyongmoshixia,yibiaodeshuchusuiwuweideshenggaoerzengjia。
射頻導納技術與傳統電容技術的區別在於測量參量的多樣性、驅(qu)動(dong)三(san)端(duan)屏(ping)蔽(bi)技(ji)術(shu)和(he)增(zeng)加(jia)的(de)兩(liang)個(ge)重(zhong)要(yao)的(de)電(dian)路(lu),這(zhe)些(xie)是(shi)根(gen)據(ju)在(zai)實(shi)踐(jian)中(zhong)的(de)寶(bao)貴(gui)經(jing)驗(yan)改(gai)進(jin)而(er)成(cheng)的(de)。上(shang)述(shu)技(ji)術(shu)不(bu)但(dan)解(jie)決(jue)了(le)連(lian)接(jie)電(dian)纜(lan)屏(ping)蔽(bi)和(he)溫(wen)漂(piao)問(wen)題(ti),也(ye)解(jie)決(jue)了(le)垂(chui)直(zhi)安(an)裝(zhuang)的(de)傳(chuan)感(gan)器(qi)根(gen)部(bu)掛(gua)料(liao)問(wen)題(ti)。所(suo)增(zeng)加(jia)的(de)兩(liang)個(ge)電(dian)路(lu)是(shi)高(gao)精(jing)度(du)振(zhen)蕩(dang)器(qi)驅(qu)動(dong)器(qi)和(he)交(jiao)流(liu)鑒(jian)相(xiang)采(cai)樣(yang)器(qi)。
對dui一yi個ge強qiang導dao電dian性xing物wu料liao的de容rong器qi,由you於yu物wu料liao是shi導dao電dian的de,接jie地di點dian可ke以yi被bei認ren為wei在zai探tan頭tou絕jue緣yuan層ceng的de表biao麵mian,對dui變bian送song器qi探tan頭tou來lai說shuo僅jin表biao現xian為wei一yi個ge純chun電dian容rong,隨sui著zhe容rong器qi排pai料liao,探tan杆gan上shang產chan生sheng掛gua料liao,而er掛gua料liao是shi具ju有you阻zu抗kang的de。這zhe樣yang以yi前qian的de純chun電dian容rong現xian在zai變bian成cheng了le由you電dian容rong和he電dian阻zu組zu成cheng的de複fu阻zu抗kang,從cong而er引yin起qi兩liang個ge問wen題ti。
射頻導納技術由於引入了除電容以外的測量參量,尤其是電阻參量,使得儀表測量信號信噪比上升,大幅度地提高了儀表的分辨力、準確性和可靠性;測量參量的多樣性也有力地拓展了儀表的可靠應用領域。
第一個問題是物料本身對探頭相當於一個電容,它不消耗變送器的能量,(純電容不耗能),dangualiaoduitantoudengxiaodianluzhonghanyoudianzu,zegualiaodezukanghuixiaohaonengliang,congerjiangzhendangqidianyalaxialai,daozhiqiaolushuchugaibian,chanshengceliangwucha。womenzaizhendangqiyudianqiaozhijianzengjialeyigequdongqi,shixiaohaodenengliangdedaobuchong,yinerhuiwendingjiazaitantoudezhendangdianya。
diergewentishiduiyudaodianwuliao,tantoujueyuancengbiaomiandejiedidianfugailezhenggewuliaojigualiaoqu,shiyouxiaoceliangdianrongkuozhandaogualiaodedingduan,zheyangbianchanshenggualiaowucha,qiedaodianxingyueqiangwuchayueda。danrenhewuliaodoubuwanquandaodiande。congdianxuejiaodulaikan,gualiaocengxiangdangyuyigedianzu,chuanganyuanjianbeigualiaofugaidebufenxiangdangyuyitiaoyouwushugewuqiongxiaodedianronghedianzuyuanjianzuchengdechuanshuxian。genjushuxuelilun,ruguogualiaozugouchang,zegualiaodedianronghedianzubufendezukangherongkangshuzhixiangdeng,yinciyongjiaoliujianxiangcaiyangqikeyifenbieceliangdianronghedianzu。cededezongdianrongxiangdangyuC物位+C掛料,再減去與C掛料相等的電阻R,就可以獲得物位真實值,從而排除掛料的影 響。即 C測量=C物位+C掛料C物位=C測量-C掛料 =C測量-R
這(zhe)些(xie)多(duo)參(can)量(liang)的(de)測(ce)量(liang),是(shi)測(ce)量(liang)的(de)基(ji)礎(chu),交(jiao)流(liu)鑒(jian)相(xiang)采(cai)樣(yang)器(qi)是(shi)實(shi)現(xian)的(de)手(shou)段(duan)。由(you)於(yu)使(shi)用(yong)了(le)上(shang)述(shu)三(san)項(xiang)技(ji)術(shu),使(shi)得(de)射(she)頻(pin)導(dao)納(na)技(ji)術(shu)在(zai)現(xian)場(chang)應(ying)用(yong)中(zhong)展(zhan)現(xian)出(chu)非(fei)凡(fan)的(de)生(sheng)命(ming)力(li)。 是目前世界上頂尖的料,液位測量儀表.
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