far-field noise 中文意思是什麼
far-field noise
解釋
遠場噪聲-
In fact, hartmann - shack wavefront sensor is affected by the noise of ccd and the constructed error too. in our compare, a bridge is setup, which is the original wavefront composed by zernike polynomial, we transform the original wavefront into far field. then we can compare the accuracy of hartmann - shack wavefront sensor with the accuracy of the system of far field diagnosis in detecting the farfield, using diffraction limit and encircle energy
我們在進行兩者相互比較的過程中，搭建了一個比較的橋梁，即由zernike多項式組成的各種原始像差波前，將它也變換到遠場作為原始理想遠場光斑，然後，以它的衍射極限和環圍能量曲線作為評價標準，比較hartmann - shack波前傳感器和遠場測量系統在光束質量診斷中的探測精度。 -
Taking the near - field solution as the inputting data for aeroacoustic formulas, we solved the far filed hsi noise of rotors by several methods, which include farassat method solving fw - h ( ffowcs - william / hawkings ) equation, kirchhoff method solving general wave equation and a combined method ( k - fwh method )
噪聲計算以旋翼流動解為基礎，採用了氣動噪聲時域理論提供的三種預測方法，包括求解ffowcswilliams - hawkings方程的farassat方法、求解廣義波動方程的kirchhoff方法以及結合前兩種方法的k - fwh方法。 -
Because the element of the far field diagnosis system which is used to detecte facula is ccd, when it works, much types of noise will affect it, and threshold value will affect the efficient signal. in this paper, hartmann - shack wavefront sensor which can detect the phase of beam is studied, what is detected by hartmann - shack wavefront sensor can be transform into far field, and we compare this result with that detected by the far field diagnosis system, and we can know which system is more accurate
事實上， hartmann - shack波前傳感器的ccd在探測光斑陣列時，也同樣受ccd噪聲因素的影響，並且還有波前本身的復原誤差，但是hartamnn - shack波前傳感器的ccd噪聲影響的是波前復原精度，雖然這也將導致事後處理遠場光斑的誤差，但這種誤差與遠場測量系統的誤差相比孰大孰小是本文研究的主要內容。
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