phase mismatch 中文意思是什麼
phase mismatch
解釋
相位失配-
Abstract : temporal properties of the second - ordre process with a chirped incident pulse are theoretically calculated. the chirp influences the irradiance and the pulse shape of the second harmonic wave with large phase mismatch. the phase distortion of all three waves is dependent more strongly on the chirp than on the phase mismatch
文摘:討論了在大相位失諧下，基波為頻率啁啾脈沖的二次諧波產生過程，結果表明選取合適的啁啾參量可以使二次諧波的光強提高，但同時會使其波形和相位發生變化.三波相位的畸變主要取決于入射的基波啁啾脈沖，而與相位匹配的失諧量關系不大 -
Such lensed fiber endfaces correct for the phase front mismatch between the curved laser beam wave front and the planar fiber beam
它們的作用是修正激光光束波前和從光纖出來光束之間的相位失匹。 -
The reasons focusing only on ray travel times are " noise tolerance could be enhanced and the sensitivity to the environment model mismatch may be reduced by neglecting amplitude information ; phase ambiguity is eliminated by employing the group delay of arriving wave packets ; travel times are pseudo - linear functions of sound speed profiles of the medium, and the perturbation of ray travel time is much smaller than sound pressure ' s
之所以選擇聲傳播時間的原因是：噪聲容限可以得到提高，並且傳播時間的計算可以不考慮聲壓的信息，從而降低了對環境模型失配的敏感性；相位的起伏也可通過到達包絡的群延時來消除；傳播時間是介質聲速分佈的偽線性函數並且傳播時間的起伏遠小於聲壓的起伏。 -
Frequency code is not uniformity distribution and keeps to a probability distribution function defined by the spectral characteristics of the target of interest. the phase code is equally duality pseudo - random sequence and used to reduced the sidelobes of the signal correlation function. and the mismatch - phase sequence is corresponding with the frequency sequence one by one
而頻率編碼為不均勻分佈，由所觀測目標的頻譜信息提取出概率密度函數決定頻率編碼序列的分佈；相位編碼為二元的偽隨機序列，採取均勻的二相編碼，消減同頻脈沖帶來的過高的相關函數的旁瓣；而失配相位為與頻率編碼相一一對應于各子脈沖中。 -
The effect of pump beam ' s walk - off and the group - velocity - mismatch in bbo crystal is discussed, the group - velocity - mismatch can be compensated by non - collinear phase - match when the angle between signal and idler beams equals to 14. 4
當下轉換光與抽運光夾角達到13 . 4度時，非共線相位匹配基本可以消除晶體中群速失配對下轉換過程的影響。 -
Therefore, for 980nm pumping, a significant disadvantage is the low coupling efficiency to the single mode fiber because of the mold field mismatch between the elliptical laser beam and the circularly symmetrical fiber mode and also because of the phase mismatch
但是對于像980nm泵浦激光器發出的激光來說，由於特殊的物理結構，使得激光光束具有高度的橢圓性。對于橢圓度高的激光光束和單模光纖耦合的報道不是很多。 -
The influence on phase shift, isolation and insertion loss of rotary - field phase shifter caused by mismatch and phase shift error is analysed
本文分析了反射系數、波片相位誤差對輸出相移、隔離度及損耗的影響。 -
For the technology of butting laser to a fiber, the coupling efficiency is very low for the serious phase mismatch and mold field diameter mismatch. so it is necessary to minimize the mismatch
如果用平端光纖直接與ld耦合，由於嚴重的相位和模場半徑不匹配，耦合效率很低，僅10左右。 -
We analyze the generation of external cavity frequency - doubling with knbo3 crystal theoretically. in order to get the second - order nonlinear conversion from 858nm to 429nm with knbo3, we use non - critical type - i phase - matching to avoid the walk - off effect the corresponding optimum focusing condition is as followings : double refraction parameter b = 0, focus parameter = 2. 84, optimum phase mismatch parameter = 0. 574. based on the theoretical analysis and numerical calculations, we obtain the ideal nonlinear conversion coefficient about 1. 45 % / w with crystal length of 7mm and 2. 07 % / w with crystal length of 10mm at the phase - matching temperature around 23. 50c
根據對其倍頻原理及性能的分析討論，在用該晶體完成波長從858nm到429nm的二階非線性轉換時，採用非臨界相位匹配條件（此時無離散效應，對應的雙折射參數b = 0 ，共焦長度為= 2 . 84 ，最佳相位失配因子為= 0 . 574 ） ，在相位匹配溫度約為23 . 5時，理論上通過計算得到理想情況下非線性轉換系數約為1 . 45 / w （長度為7mm ） ， 2 . 07 / w （長度為10mm ） 。 -
It is concluded that for cvd method the cubic phase content and adhesion are highly effected by the crystal lattice mismatch between c - bn and substrate materials, however, for sputter method the crystal lattice mismatch between c - bn and substrate materials affects the quality of c - bn thin films very little. 5 n - type doping of bn thin films and preparing of bn ( n - type ) / si ( p - type ) heterojunctions adding s into the mixture of argon and nitrogen used as working gas, we sputtered 1ibn target to deposit bn thin films so as to study the n - type doping of bn thin films, and bn ( n - type ) / si ( p - type ) heterojunctions were prepared
5實現了氮化硼薄膜的n型摻雜，成功制備出bn型）乃…型）異質結並且首次系統研究了其卜v和cv特性我們用射頻濺射法濺射六角氨化硼靶，在工作氣體氮和氮中混入s ，沉積氮化硼薄膜，以研究氮化硼薄膜的n型摻雜，並得到bnh型）侶i …型）異質結。 -
And the performance of these algorithms is compared with each other. to simplify the sampling rate design and digital processing in receiver, we prefer to use the direct down conversion structure. the problem is the analog front - end in this structure will bring iq mismatch, which will effect the phase of recovered carrier and code
第三部分對接收機中的載噪比估計演算法進行了分析，目前gps導航接收機中採用的載噪比估計演算法對殘余多普勒非常敏感，而且gps中的數據速率為50bps ，北斗二代中的存在數據速率為500bps ，應用條件的差異導致該演算法的不可用。 -
The cancellation performance ( cp ) of cancellation loops, which constitute the feed - forward amplifier system, is investigated mathematically and the simulation results are given. the effects of amplitude imbalance, phase imbalance and delay mismatch on the cancellation performance of a cancellation loop are fully analyzed
本文分析了前饋功率放大系統中抑制環路的工作原理；推導了幅度失配、相位失配、延遲失配對環路抑制能力的理論解析式，並進行了模擬研究。 -
The method digitally modulates the pseudo - random fsk / psk multi - modulation signal and the partly - matched processing signal of this signal with the same frequencies sequence and phases sequence in the same time, additionally, add a mismatch - phase sequence to the partly - matched processing signal
設計的方法是對偽隨機fsk / psk復合調制信號與非完全匹配處理信號採用相同的頻率的數字調制（ fsk ） ，相同的相位的數字調制（ psk ） ，並對非完全匹配處理信號增加失配相位。 -
To resolve the mismatch between high - speed a / d converters and dsp chips, a improvement parallel structure of ddc is put forward, which is based on poly - phase decomposition
接收機并行結構演算法的工程實現:解決了前端采樣的高速數據流遠遠超過後端dsp處理能力的問題。
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