| dc.description.abstract | The optical properties of petal surface microstructures have always been a subject of discussion by scientists. Nowadays, the commonly used diffuse reflectance measurement methods include goniophotometric measurement, integrating sphere and other methods. The use of goniophotometry needs to receive signals point by point, which is time-consuming. In addition, since the cells will gradually shrink after the petals are picked, the measurement using the goniophotometric system will cause differences in the data due to the shrinkage of the cells. The integrating sphere gathers the energy of all beams together for integration, therefore, the angle information of the sample cannot be obtained from the result, only the distribution of the spectrum can be obtained. In order to quickly collect the diffuse reflection angle information of the sample, this study established an imaging scatterometer system (Imaging Scatterometry), which can collect the diffuse reflection angle information of the hemisphere at one time. In the experiment, the confocal characteristics of the elliptical reflector are used to set up the system. When the sample is placed at the first focal point of the elliptical reflector, the angle information of the diffuse light generated by it will be reflected by the elliptical reflector and then converge to the second focus. The angle information is converted into information on the Fourier plane through the lens, and then, the angle information of the diffuse reflection light intensity of the sample can be obtained by using the camera to record the Fourier plane.
In order to locate the angle information in the image, the relationship between the pixel and the angle in the image is found out by means of linear fitting, so as to draw the angle coordinate diagram. Then use the standard sample to verify the correctness and accuracy of the angular coordinate diagram. Finally, three samples with different surface roughness were measured by imaging scatterometry, and the optical properties presented by different samples were discussed. | en_US |