激光直写机是制作衍射光学元件的关键设备，离焦检测技术是其中的重要单元技术之一。
Laser direct writing system is the key equipment for fabrication of optical diffractive elements, and the defocus detection technique is the important sub-tech in it.
利用高温高压釜设备辅以失重法、采用扫描电子显微镜（SEM）和X射线衍射（XRD）技术，研究了在动静两种状态下CO2分压对P110钢腐蚀产物膜的影响。
Influence of CO2 partial pressure on corrosion scale of P110 steel in stimulated oil field environments was investigated by using scanning electron microscopy(SEM) and x-ray diffraction(XRD).
最终采用衍射光栅单色仪作为测量光电器件光谱特性的设备。
Finally adopted a diffraction grating monochromator spectral characteristics of optoelectronic devices as measuring equipment.
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