準直聲束 的英文怎麼說
中文拼音 [zhǔnzhíshēngshù]
準直聲束
英文
collimated sound beam-
Standard specification for straight - beam ultrasonic examination of plain and clad steel plates for special applications
特殊設備用的普通鋼板和包覆鋼板的直波束超聲探傷檢驗的標準規范Based the research on the laser beam drift feedback control technique, analysing the beam drift and its frequency components, a laser beam directional stability method is studied in the thesis in detail, with its measurement and control circuit system that combines the laser beam intensity modulation and the beam drift feedback control technique. in this method, at first the laser beam intensity is modulated with the acoustooptic modulator, then the lock - in amplifier is applied to detect and demodulate the modulating signal, at last a feedback control signal is generated by the dsp control circuit at last, including : 1
本文在原有的激光光束漂移量反饋控制準直技術的基礎上,對光束漂移量信號的數據和頻譜進行了分析,重點研究了一種集聲光調制光強與光束漂移量反饋控制準直技術於一體的激光光束方向穩定方法及其測控電路系統,該方法通過聲光調制實現光強調制,接著通過鎖相放大電路檢測並解調調制信號,然後通過dsp控制電路進一步對光束的漂移量進行反饋控制。Standard guide for detection and evaluation of discontinuities by contact pulse - echo straight - beam ultrasonic methods
用觸點脈沖回聲直束法探測和評價不連續性的標準指南
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