例句與造句

1. a new method of absolute calibration of photodetector sensitivity based on spontaneous parametric down-conversion ( spdc ) biphoton field is described . the process of spdc is studied theoretically . the single photon detection probability and two-photon coincidence probability are derived and the calibration principle for photodetectors is explained . an experimental system has been set up . the sensitivity of a photon-counting photomultiplier tube was measured, and the results were compared with those obtained using conventional method
   討論了一種基于自發(fā)參量下轉(zhuǎn)換雙光子場(chǎng)絕對(duì)校準(zhǔn)光電探測(cè)器靈敏度的新方法，著重推導(dǎo)了對(duì)自發(fā)參量下轉(zhuǎn)換過(guò)程中產(chǎn)生的單光子的探測(cè)概率和雙光子的符合速率，從而闡明了絕對(duì)測(cè)量光電探測(cè)器量子效率的原理.基于這一方法對(duì)光子計(jì)數(shù)型光電倍增管的響應(yīng)靈敏度進(jìn)行了測(cè)量，并將實(shí)驗(yàn)結(jié)果與常規(guī)方法測(cè)得的結(jié)果進(jìn)行了比較
2. It's difficult to find photon coincidence in a sentence. 用photon coincidence造句挺難的