全息测量理论分析中颗粒模型的建立

 在激光全息测量中常出现液体颗粒,液体颗粒可近似看作半透明球体。这种球体对入射光存在折射、衍射、反射、吸收和杂质对入射光波的衰减作用等影响。首先将颗粒作为高象差的球形透镜求出其焦距,再由等焦距和等光程条件找出与球形透镜等价的薄透镜。以薄透镜考虑颗粒的折射及衍射作用,可导出透明颗粒复振幅透过率函数。对于半透明颗粒存在的反射、吸收及衰减作用则在复振幅透过率函数中用综合透光率加以修正。

ESTABLISHMENT OF A PARTICLE MODEL IN THE THEORETICAL ANALYSIS OF LASER HOLOGRAPHIC MEASUREMENT

A liquid particle, which often appears in the laser holograghic measure-merit, can be treated as a semi-transparent spherical one. The sphere affects the incident by the refraction, diffraction, reflection, absorption and attenuation of impurity. At first, the particle is considered as a highly aberrated spherical lens, so that its focal length is gained, and then the equivalent thin lens is found under the condition of the equal focal length and equal light distance. By considering the refractive and diffractive effects of the particle in terms of the thin lens, the coinples amplitude transparency of the transparent particle can bo derived. The reflective, absorptive and attenuative effects of the semi-transparent particle can be revised in the complex ampliude transparency by a synthetical transparency.