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DLP6500翻转8位正弦光栅条纹,相机拍摄得到的条纹不连续



用DLP6500在pattern on the fiy 模式下翻转一幅8位正弦光栅条纹(图1),exposure为2秒,CCD相机直接拍摄DMD,拍摄到的图案不连续,不是正弦条纹,看上去有周期性的间断,像矩形条纹或者2位深度的条纹(图2),这是什么原因。若是一位深度的条纹,则正常拍摄到的图片正常。光源方法是用闻亭泰科的4500投影仪往白色陶瓷板投射白图,照亮陶瓷板,白陶瓷板经过消色差双胶合透镜成像在DMD上,用于打光。