1.We observed the distribution of diffraction spectrum of grating and changed law with increment incidenceangle when dip incidence with experimental mathod.
3.The geometric nonlinear factors include cable sag, beam-column effect and large structure displacement, and the aerodynamic nonlinear factors are wind incidenceangle effect and self-excited force.
4.A simulation model is developed to estimate acoustic field in the anechoic tank, taking into account secondary reflection, variation of absorption coefficient with respect to the incidenceangle, and effects of directional sources.
5.The relatively rational parameters of grating are chosen according to the calculated results to make that when incidenceangle or azimuth is varied, the light of different wave band will be reflected.
6.The measuring precision can reach to 20‰ under the condition when the temperature is above 20℃, salinity is over 10‰ with stable flight and conant incidenceangle having got good results.
9.The possibility is shown that most of the energy may be reflected in the air for an electromagnetic wave of specific wave-length and incidence at a specific angle.
10.The results show that if the angle of incidence is chose to Brewster angle when the grating period is 2.80μm(wavelength is 0.35 μm), the reflection efficiency of the grating is restrained.
