紫外成像(xiang)儀是(shi)指，電(dian)(dian)暈(yun)(yun)放(fang)(fang)電(dian)(dian)是(shi)一種局(ju)(ju)部(bu)化(hua)的放(fang)(fang)電(dian)(dian)現(xian)象(xiang)， 當(dang)帶電(dian)(dian)體的局(ju)(ju)部(bu)電(dian)(dian)壓應力超過(guo)臨界值(zhi)時，會使空氣游(you)離而(er)產生電(dian)(dian)暈(yun)(yun)放(fang)(fang)電(dian)(dian)現(xian)象(xiang)。特(te)別是(shi)高壓電(dian)(dian)力設備，其常因設計(ji)、制造(zao)、安裝及維護工(gong)作不良產生電(dian)(dian)暈(yun)(yun)、閃絡(luo)或電(dian)(dian)弧。在(zai)放(fang)(fang)電(dian)(dian)過(guo)程中，空氣中的電(dian)(dian)子不斷獲得和釋放(fang)(fang)能量，而(er)當(dang)電(dian)(dian)子釋放(fang)(fang)能量（即(ji)放(fang)(fang)電(dian)(dian)），便會放(fang)(fang)出(chu)紫外線(xian)。

隨著(zhu)電(dian)(dian)(dian)(dian)(dian)力系(xi)統的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)網規(gui)模的(de)(de)(de)(de)不(bu)(bu)斷(duan)(duan)擴大、電(dian)(dian)(dian)(dian)(dian)力負荷要求(qiu)的(de)(de)(de)(de)不(bu)(bu)斷(duan)(duan)提(ti)(ti)高(gao)，電(dian)(dian)(dian)(dian)(dian)力系(xi)統中(zhong)使用(yong)的(de)(de)(de)(de)各種類型的(de)(de)(de)(de)高(gao)壓設(she)(she)(she)備的(de)(de)(de)(de)損(sun)壞、故障也不(bu)(bu)斷(duan)(duan)增(zeng)加(jia)(jia)，相應對預防性(xing)維護(hu)的(de)(de)(de)(de)要求(qiu)也不(bu)(bu)斷(duan)(duan)提(ti)(ti)高(gao)。輸(shu)供電(dian)(dian)(dian)(dian)(dian)線(xian)(xian)路(lu)和(he)(he)變(bian)電(dian)(dian)(dian)(dian)(dian)站配(pei)電(dian)(dian)(dian)(dian)(dian)等設(she)(she)(she)備在大氣(qi)環境下(xia)工作，在某些情況下(xia)隨著(zhu)絕(jue)緣(yuan)(yuan)性(xing)能的(de)(de)(de)(de)降低(di)、出現(xian)(xian)結構(gou)缺陷(xian)，或表(biao)面局(ju)部放(fang)電(dian)(dian)(dian)(dian)(dian)現(xian)(xian)象，電(dian)(dian)(dian)(dian)(dian)暈和(he)(he)表(biao)面局(ju)部放(fang)電(dian)(dian)(dian)(dian)(dian)過程中(zhong)，電(dian)(dian)(dian)(dian)(dian)暈和(he)(he)放(fang)電(dian)(dian)(dian)(dian)(dian)部位將(jiang)大量輻射(she)紫外(wai)線(xian)(xian)，這(zhe)樣(yang)便可以利用(yong)電(dian)(dian)(dian)(dian)(dian)暈和(he)(he)表(biao)面局(ju)部放(fang)電(dian)(dian)(dian)(dian)(dian)的(de)(de)(de)(de)產生和(he)(he)增(zeng)強間接評估運行設(she)(she)(she)備的(de)(de)(de)(de)絕(jue)緣(yuan)(yuan)狀(zhuang)況和(he)(he)及時(shi)發(fa)現(xian)(xian)絕(jue)緣(yuan)(yuan)設(she)(she)(she)備的(de)(de)(de)(de)缺陷(xian)。目前，可用(yong)于診斷(duan)(duan)目的(de)(de)(de)(de)的(de)(de)(de)(de)放(fang)電(dian)(dian)(dian)(dian)(dian)過程的(de)(de)(de)(de)各種方(fang)法中(zhong)，光學方(fang)法的(de)(de)(de)(de)靈(ling)(ling)敏(min)度(du)、分辨(bian)率和(he)(he)抗(kang)干(gan)擾能力好。即采(cai)用(yong)高(gao)靈(ling)(ling)敏(min)度(du)的(de)(de)(de)(de)紫外(wai)線(xian)(xian)輻射(she)接受(shou)器，記錄電(dian)(dian)(dian)(dian)(dian)暈和(he)(he)表(biao)面放(fang)電(dian)(dian)(dian)(dian)(dian)過程中(zhong)輻射(she)的(de)(de)(de)(de)紫外(wai)線(xian)(xian)，再(zai)加(jia)(jia)以處理(li)、分析達到(dao)評價(jia)設(she)(she)(she)備狀(zhuang)況的(de)(de)(de)(de)目的(de)(de)(de)(de)。預防，減(jian)少設(she)(she)(she)備發(fa)生故障造(zao)成(cheng)的(de)(de)(de)(de)重大損(sun)失，具有很大的(de)(de)(de)(de)經濟效(xiao)益。

UV（紫外成像儀檢測）和IR（紅外熱像儀檢測）技術的比較。UV檢測和紅外成像是一種互補性而非沖突性技術。電力設施一個完整的檢測應該包括紫外成像、紅外成像和可見光檢測。電暈是一種發光的表面局部放電，由于空氣局部高強度電場而產生電離。該過程引起微小的熱量，通常紅外檢測不能發現。紅外檢測通常是在高電阻處產生熱點。紫外成像儀可以看到的現象往往紅外成像儀不能看到，而紅外成像儀可以看到的現象往往紫外成像儀不能看到。