一、氙氣閃光燈是什么意思
氙(xian)(xian)氣(qi)閃光(guang)(guang)燈,又(you)稱高(gao)(gao)強度氣(qi)體放(fang)(fang)電(dian)(dian)閃光(guang)(guang)燈。氙(xian)(xian)氣(qi)閃光(guang)(guang)燈由(you)氙(xian)(xian)氣(qi)燈泡、變(bian)(bian)壓(ya)(ya)安定器和絕緣導線(xian)組成,利用(yong)特(te)殊氙(xian)(xian)氣(qi)體在超高(gao)(gao)電(dian)(dian)壓(ya)(ya)狀態下擊發(fa)放(fang)(fang)電(dian)(dian)。其工作原理是(shi),通過(guo)相機的(de)觸點觸發(fa)后,通過(guo)變(bian)(bian)壓(ya)(ya)器,在瞬間內(nei)將12V電(dian)(dian)源升至2萬伏(fu)以上的(de)高(gao)(gao)壓(ya)(ya)脈沖電(dian)(dian)壓(ya)(ya),激活氙(xian)(xian)氣(qi)燈泡中的(de)氙(xian)(xian)氣(qi)在電(dian)(dian)弧(hu)中產生(sheng)6000K--10000K色(se)溫度的(de)強勁(jing)光(guang)(guang)芒,顏色(se)呈晶鉆白中略帶紫藍。
二、氙氣閃光燈與LED閃光燈的區別有哪些
1、概念形式不同
(1)氙氣閃光燈:氙氣(qi)(讀音xian)是(shi)惰性氣(qi)體中原(yuan)子(zi)序數較(jiao)(jiao)大的元素(也就是(shi)較(jiao)(jiao)重的元素),原(yuan)子(zi)半徑較(jiao)(jiao)大。在弧(hu)光(guang)(guang)放電(dian)(dian)(dian)中,電(dian)(dian)(dian)子(zi)與(yu)(yu)氣(qi)體發(fa)生彈性碰撞損失的能量(liang)同(tong)氣(qi)體的原(yuan)子(zi)量(liang)成(cheng)反比(bi),所以與(yu)(yu)其他惰性氣(qi)體相(xiang)比(bi)氙氣(qi)弧(hu)光(guang)(guang)放電(dian)(dian)(dian)時損失較(jiao)(jiao)小,發(fa)光(guang)(guang)效率高。同(tong)時,氙氣(qi)的電(dian)(dian)(dian)離電(dian)(dian)(dian)勢較(jiao)(jiao)低(di),放電(dian)(dian)(dian)時電(dian)(dian)(dian)極附近的電(dian)(dian)(dian)壓降小,這樣可以延長電(dian)(dian)(dian)極的壽命。又由于氙原(yuan)子(zi)結構(gou)的特(te)點,長弧(hu)氙燈發(fa)出的光(guang)(guang)譜和日光(guang)(guang)非常接(jie)近。
(2)LED閃光燈:LED是英(ying)文ightemitting diode(發(fa)光(guang)二(er)極管(guan))的(de)(de)(de)(de)縮寫(xie),它的(de)(de)(de)(de)基(ji)本(ben)結構是一(yi)(yi)塊電致發(fa)光(guang)的(de)(de)(de)(de)半導(dao)體材料,置于(yu)一(yi)(yi)個有引(yin)線(xian)的(de)(de)(de)(de)架子上,然后四周用(yong)環(huan)氧樹脂密封(feng),起到保護內部芯(xin)線(xian)的(de)(de)(de)(de)作(zuo)用(yong)。LED燈由(you)于(yu)能耗低亮(liang)度(du)高一(yi)(yi)般用(yong)在拍照手機上,用(yong)于(yu)光(guang)線(xian)不補時的(de)(de)(de)(de)補光(guang)。
2、作用原理不同
(1)氙氣閃光燈原理:當按下快門(men)時(shi),快門(men)反(fan)饋給CPU一個(ge)信號,同(tong)時(shi),CPU同(tong)步(bu)向三極(ji)管(guan)(guan)輸出一個(ge)控制信號觸發(fa)電路,進行(xing)閃(shan)光(guang)(guang)。接著三極(ji)管(guan)(guan)導通(tong),使觸發(fa)電容開始放電,在變壓器的初級上(shang)產生一個(ge)脈(mo)沖電流,這(zhe)個(ge)電流有使變壓器的次(ci)(ci)級產生近(jin)4000v的高壓,激發(fa)閃(shan)光(guang)(guang)燈(deng)內部(bu)疝氣電離并導通(tong)。使電容上(shang)存儲的電能瞬間通(tong)過閃(shan)光(guang)(guang)燈(deng)管(guan)(guan)放電轉化為光(guang)(guang)能,完(wan)成一次(ci)(ci)閃(shan)光(guang)(guang)。
(2)LED閃光燈的原理:LED并不(bu)是通過(guo)原子(zi)(zi)內部的電子(zi)(zi)躍變(bian)來(lai)發光的,而是通過(guo)將電壓加在LED的PN結兩端,使PN結本身形成一個能(neng)(neng)級(ji),然后(hou)電子(zi)(zi)在這(zhe)個能(neng)(neng)級(ji)上躍變(bian)并產生光子(zi)(zi)來(lai)發光的。