特殊用法beam collimator1.束准直仪， 束平行光管borax paraffin collimator1.硼石蜡准直仪lead-baffled collimator1.铅闸准直仪off-axis collimator1.偏轴平行（准直）光管off-axis reflecting collimator1.离轴反射式准直仪vertical collimator1.垂准器
