IC697CPU731
IC697CPU731IC697CPU731
像散(Astigmatism)
在畫面中央部份可以成像但在離中央越遠時其由點光源投射至焦點平面上時反而成一直線的的影像時此現(xiàn)象就稱為像散,就像地球的子午線跟經(jīng)緯線一樣在三度空間的立體面來看時他是一個以中軸為中心的一個有挾角(就像我們座游覽車可將座位放倒一樣)的半倒的圓 但是在平面成像時就會變橢圓或一直線的顯示了。
像面彎曲(Curvature of field)●業(yè)從事(DCS系統(tǒng))(機器人系統(tǒng))(大型伺服控制系統(tǒng))模塊 備件銷售廈門[泰尼電氣有
廈門泰尼備件解決方案銷售中心:
轉(zhuǎn)子流量計在工業(yè)生產(chǎn)過程中應(yīng)用較廣,可以測量多種介質(zhì)的流量,特別適用于中小管徑和低雷諾數(shù)的中小流量測量。轉(zhuǎn)子流量計結(jié)構(gòu)簡單,靈敏度高,量程比寬(10:1),壓力損失小且恒定,對直管段的要求不高,刻度近似線性,價格便宜,使用維護簡便。但儀表受被測介質(zhì)密度、粘度、溫度、壓力等因素的影響,其精度一般在1.5級左右。
這個現(xiàn)象是一個拍攝的物體是平面的可是經(jīng)由鏡頭以后在焦點平面時對準(zhǔn)中間周邊是模糊的,對準(zhǔn)周邊中央是模糊的,也就是說平面的畫面變成凹凸畫面了就像平面的鏡子變成路 口的凸面鏡一樣。
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