测量投影仪又称为光学投影检量仪或光学投影比较仪，为利用光学投射的原理，将被测工件之轮廓或表机投影至观察幕上，作测量或比对的一种测量仪器，可以高效地检测各种形状复杂工件的轮廓和表面形状，主要由投影箱、主壳体和工作台三大部分构成。
采用光栅技术，用98J型精密测量投影仪对X光底片进行测量，用微机采集和处理数据。
The 98J mode precision measurement projector is used for measurement of X ray plate by grating technique and a personal computer is used to collect and to process the data.
制作欧姆表透射投影教具，可便于结合投影仪进行欧姆表测量原理的教学。
Making transmission projection experimental realia of Ohmmeter is convenient for teaching Ohm-meter measurement principle with the aid of projector.
为设计大屏幕、小结构的投影仪及其它测量仪器，提供了依据。
This provides a theoretical basis for designing projectors and other instruments of large field and compact structure.
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