大(da)米(mi)色(se)(se)(se)選(xuan)機是針對黃黑(hei)粒(li)米(mi)與(yu)正(zheng)常白(bai)米(mi)之問無(wu)一般(ban)物理特性上的(de)差(cha)異(yi),無(wu)法(fa)用(yong)(yong)(yong)常規清(qing)理方法(fa)將(jiang)其(qi)(qi)清(qing)除(chu)(chu),只能利(li)用(yong)(yong)(yong)黃黑(hei)粒(li)米(mi)與(yu)白(bai)米(mi)之間在顏色(se)(se)(se),反光(guang)率的(de)差(cha)異(yi),用(yong)(yong)(yong)光(guang)電(dian)(dian)比色(se)(se)(se)的(de)方法(fa)和設備將(jiang)其(qi)(qi)剔除(chu)(chu),也稱光(guang)電(dian)(dian)色(se)(se)(se)選(xuan)機。光(guang)電(dian)(dian)傳感器(qi)是色(se)(se)(se)選(xuan)機的(de)眼(yan)睛,常用(yong)(yong)(yong)的(de)光(guang)電(dian)(dian)傳感器(qi)有(you)硅(gui)光(guang)電(dian)(dian)池、黑(hei)白(bai)線陣(zhen)、彩色(se)(se)(se)線陣(zhen)CCD等,從色(se)(se)(se)選(xuan)類別的(de)多少和使用(yong)(yong)(yong)年限考慮,選(xuan)購具(ju)有(you)彩色(se)(se)(se)線陣(zhen)CCD傳感器(qi)的(de)色(se)(se)(se)選(xuan)機具(ju)有(you)優勢。