The spectral resolution is a main index of evaluating the performance of the designed acousto-optic tunable filter (AOTF). In this letter, an accurate expression of the spectral resolution is presented by considering ...The spectral resolution is a main index of evaluating the performance of the designed acousto-optic tunable filter (AOTF). In this letter, an accurate expression of the spectral resolution is presented by considering both the birefringence and the rotatory property of TeO2 crystal. The deduced expression is significant in improving the accuracy of the design of an AOTF and pushing the development of the high-performance AOTF.展开更多
In Light of the analysis of the physical implication and underlying assumption of the bandwidth parameter epsilon of wave spectrum, a time-averaging method is used to evaluate epsilon of the JONSWAP spectrum for diffe...In Light of the analysis of the physical implication and underlying assumption of the bandwidth parameter epsilon of wave spectrum, a time-averaging method is used to evaluate epsilon of the JONSWAP spectrum for different sea states. The resulting values of epsilon, which vary from 0.44 to 0.53 depending on the dimensionless fetch, are physically meaningful and reasonable. The same method is also used to compute epsilon from wind-wave records measured in a flume under different wind speeds at different fetches. The computed values of epsilon, which vary with wind fetches and speeds too, are compared with those evaluated for the JONSWAP spectrum.展开更多
RGB三基色的LCD显示器件在高端的应用领域已经不能满足细节显示要求。研究发现可以增加基色的数量,如黄色,形成RYGB四基色,实验证明显示的色域有明显的改善。文中首先研究LCD的电光特性,而后重点研究频谱带宽对LCD电光特性的影响。在1 k...RGB三基色的LCD显示器件在高端的应用领域已经不能满足细节显示要求。研究发现可以增加基色的数量,如黄色,形成RYGB四基色,实验证明显示的色域有明显的改善。文中首先研究LCD的电光特性,而后重点研究频谱带宽对LCD电光特性的影响。在1 k Hz固定频率驱动下,通过改变电压来改变LCD的透过率,随着驱动电压的变化,LCD的透过率有较大变化。选取四种基色对应的波长,研究它们的电光特性曲线,得出LCD四基色的电光特性曲线随电压变化的趋势一致;研究不同带宽下四基色波长的透过率,得出带宽对红、黄、绿三种基色的透过率影响不大,而带宽对蓝基色的透过率影响较大。展开更多
文摘The spectral resolution is a main index of evaluating the performance of the designed acousto-optic tunable filter (AOTF). In this letter, an accurate expression of the spectral resolution is presented by considering both the birefringence and the rotatory property of TeO2 crystal. The deduced expression is significant in improving the accuracy of the design of an AOTF and pushing the development of the high-performance AOTF.
基金National Natural Science Foundation of China(Grant No.49676277)
文摘In Light of the analysis of the physical implication and underlying assumption of the bandwidth parameter epsilon of wave spectrum, a time-averaging method is used to evaluate epsilon of the JONSWAP spectrum for different sea states. The resulting values of epsilon, which vary from 0.44 to 0.53 depending on the dimensionless fetch, are physically meaningful and reasonable. The same method is also used to compute epsilon from wind-wave records measured in a flume under different wind speeds at different fetches. The computed values of epsilon, which vary with wind fetches and speeds too, are compared with those evaluated for the JONSWAP spectrum.
文摘RGB三基色的LCD显示器件在高端的应用领域已经不能满足细节显示要求。研究发现可以增加基色的数量,如黄色,形成RYGB四基色,实验证明显示的色域有明显的改善。文中首先研究LCD的电光特性,而后重点研究频谱带宽对LCD电光特性的影响。在1 k Hz固定频率驱动下,通过改变电压来改变LCD的透过率,随着驱动电压的变化,LCD的透过率有较大变化。选取四种基色对应的波长,研究它们的电光特性曲线,得出LCD四基色的电光特性曲线随电压变化的趋势一致;研究不同带宽下四基色波长的透过率,得出带宽对红、黄、绿三种基色的透过率影响不大,而带宽对蓝基色的透过率影响较大。
