Abstract: This paper deals with the basic theory of a photoelectric type angular displacement measuring instrument, its design key pointers and measuring circuits. The test results of a prototype device have shown that the said photoelectric type angular displacement measuring device has the following technical characteristics: sensitivity, 1000 mv/1$DGR@; measurement range, $POM@5$DGR@; precision, 0.3%; resolution, 30$DPRM@.!2
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