Sampling and attenuation of the laser beam to be measured is the first step for detector array target to measure temporal and spatial distribution of laser intensity. Existing sampling attenuation technology is more sensitive to the incident angle of laser beam. In practical applications, sampling angle response characteristics of laser beam can be measured experimentally, and get the coefficient to be corrected. Among them, scattering sampling method is based on scattering parameters of selected sampling material, which can effectively correct sampling angle response in theoretical or simulation stage. In this paper, focusing on angular characteristics of scattering sampling for detector array target, based on bidirectional transmission distribution function, the correlation between the scattering sampling angular characteristics and scattering distribution is derived. Experiments have proved that scattering sampling angle characteristic for detector array target can be expressed in the form of ratio of material scattering distribution function. This characteristic provides a certain guidance for design of scattering sampling angle tolerance for detector array target.
To optimize the application of the array fibers in the measurement of large angle laser parameters, the fiber loss is analyzed specifically. And the quantitative method of the actual and available numerical aperture about the fiber is studied, which also represent the allowable incident angle of the laser of the measurement system. Firstly, the theoretical model of fiber loss is constructed, and the influences of incident angle, fiber bend and theoretical numerical aperture on loss are discussed. Secondly, the basic loss, which be seen as the background value, is measured experimentally; by which it is considered that the all-glass fiber with coating and protective layers is suitable for this application. Thirdly, combined with experiment and simulation data, the tolerable bend of the fiber is quantified: when the bend radius is more than 300 times the core radius, the loss can be unaffected by the degree of bend. Finally, how to deduce the actual numerical aperture from the theoretical numerical aperture is discussed. It is verified that there is a good linear correlation between them, and the fitting goodness reaches 0.9970. This paper provides pertinent and effective standards for the selection and arrangement of the array fibers, and offers a theoretical foundation for constructing large angle laser parameters measurement.
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