光電編碼器技術(shù)
從名字我們能知道,光電編碼器是通過(guò)光線來(lái)檢測(cè)位置信號(hào)的。一個(gè)光電編碼器主要包含四種原件:
光源(通常為LED)
傳感器
可旋轉(zhuǎn)的碼盤(pán)
遮光掩碼盤(pán)
在與被測(cè)軸同心的碼盤(pán)上刻制了按一定編碼規(guī)則形成的遮光和透光的軌道。碼盤(pán)的一邊是發(fā)光LED,另一邊則是接收光線的傳感器。碼盤(pán)隨著被測(cè)軸的轉(zhuǎn)動(dòng)使得透過(guò)碼盤(pán)的光束產(chǎn)生間斷,通過(guò)光電器件的接收和電路的處理,產(chǎn)生電信號(hào)的輸出,再經(jīng)過(guò)數(shù)字處理可計(jì)算出位置和速度信息。
在光電編碼器中每個(gè)傳感器用于一路信號(hào)的檢測(cè)。一條碼道可以配合兩個(gè)傳感器進(jìn)行檢測(cè),這兩個(gè)傳感器檢測(cè)出來(lái)的信號(hào)會(huì)有一定的相位偏差。從這組帶相位差的信號(hào)我們可以得到更多的信息比如旋轉(zhuǎn)方向。如果我們需要零位信號(hào)用于脈沖計(jì)數(shù)的校正,通常碼盤(pán)上還會(huì)有另一條軌道用于產(chǎn)生零位信號(hào)。
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