echo n. (pl. echoes) 1.回聲,反響;共鳴,反映。 2.重復(fù),摹仿;摹仿者;應(yīng)聲蟲。 3.【音韻學(xué)】與上句末音押韻的詩句。 4.〔E-〕 【希臘神話】山林的女神。 5.(雷達(dá)的)回波,反射波。 find an echo in sb.'s heart 得人共鳴。 to the echo 大聲,高聲 (applaud [cheer] to the echo 大聲喝彩)。 vt. 1.使反響。 2.模仿,重復(fù)。 3.反射(聲音等)響。 echo sb.'s words 隨聲附和。 vi. 1.發(fā)出回聲,共鳴 (with)。 2.重復(fù)。 3.(橋牌戰(zhàn)中)打出報信牌。
The system is based on ultrasonic multiple pulse - echo principle , the control circuit of sonic circulation , can improve the precision of measurement by extending the time of detection 本系統(tǒng)以超聲波多次脈沖反射法測距原理為基礎(chǔ),設(shè)計聲循環(huán)反射控制電路,達(dá)到以延長測量時間為代價提高測量精度的目的。
The phase stationary principles ( psp ) and the paired echo principles ( pep ) are firstly reviewed . the error tolerable levels and the error budget are secondly determined . system error model is introduced to analyze the effects of various error sources 利用駐定相位原理和成對回波理論,分析了系統(tǒng)幅相誤差的影響;建立了uwbr系統(tǒng)誤差模型;提出了uwbr系統(tǒng)誤差補償?shù)男路椒ú⒊晒?yīng)用于實際uwbr系統(tǒng)。
Therefore , it is necessary for guaranteeing the quality of steel plate to detect and repair the roll profile timely and exactly . this paper presents the sonic circulation and multi - pulse echo principle and designs roll profile ultrasonic measurement system based on the analysis of 3d surface measurement technology and roll profile measurement methods 本文在分析了三維面型檢測的發(fā)展現(xiàn)狀及目前輥型的檢測方法的基礎(chǔ)上,提出了聲循環(huán)多次脈沖反射測量原理,并以此為基礎(chǔ)設(shè)計了上位機化的超聲波輥型測量系統(tǒng)。