排序方式: 共有76条查询结果,搜索用时 156 毫秒
71.
72.
73.
74.
ocoThesystemdeveloPedtomeasuresurfaceroughnessisasshoWnin'Fig-l.ThemeasuredsutheeisillthenatedbytWofocusedbeamswithslighdydifferentfreqUenciesandtherellectedheamsinterferewitheachother,thePhaseofthesinusoidalintensitymedulationisrelatedtotheheightdifferencebetWeetheilldrinatedpointSontheIfatrandihonalmethodisusedwiththissystem,~sismeasuredbyscedngalongalinecormectingbotandrmmeasuredpontSarelinkedup.bo,thismethedhasthefollowingtaeshortcotringr:(1)Ashorterdistanceismpitalbetweenthelightpoint… 相似文献
75.
76.
An optical fiber strain sensor utilizing the mode-mode interference of LP_(01)~x,andLR_(11)~x,modes in bow tie optical fibers is described.The heterodyne interference caused byfrequency modulation of laser diode(LD) with ramp injection current is used torealize the detection of linear phase.Experimental results show a resolution of about 2%of one fringe corresponding to a strain of 2.9με.m. 相似文献