Time resolving two-dimensional laser light scattering apparatus with small and large angle

Abstract

The related temporal resolution 2D laser optical scatterometer for large / small angle (20-90deg / 0-20deg) comprises: a large angle detection system included two wide-aperture lens and a very sensitive array detector, a system central line fit to form some included angle with incidence light and detect the continual scattering signal in the range; a detection screen and another detector both on the incidence direction for scattering signal in small angle range. This invention can detect very poor signal or collects strong signal by screen imaging method.

Description

technical field [0001] The invention belongs to the field of time-resolved two-dimensional laser light scattering instruments, in particular to a device that can detect large angles (20-90 degrees) and small angles (0-20 degrees) on one instrument, and has high time resolution A time-resolved two-dimensional laser light scattering instrument with both large and small angles. Background technique [0002] Light scattering of polymers is a research method that uses the light scattering phenomenon of polymers to study the internal structure of polymers. It plays an important role in the study of polymer solutions and textures, especially for blending. It is an indispensable tool for the study of the phase separation behavior of matter. At present, there are mainly light spot method and photographic method for signal detection of polymer light scattering. For example, in solution light scattering instruments, the detector is generally a photomultiplier tube, which has high sen...

AI Technical Summary

Problems solved by technology

For example, in solution light scattering instruments, the detector is generally a photomultiplier tube, which has high sensitivity, but the scattered signals at different angles are detected angle by angle by rotating the detection position of the photomultiplier tube, and continuous light scattering cannot be obtained. signal; and when it is necessary to detect signals at many angles, the time resolution of detection is very low due to the need to rotate the position of the detector back and forth

[0003] The signal detection of the commonly used small-angle laser light scattering instrument mainly adopts the photographic method. The scattering signal is first imaged on the screen, and then the image on the screen is detected by a CCD detector (camera or high-speed camera), which can detect a certain range of angles. Continuous scattering signal, however, due to the low detection sensitivity, only strong scattering signal can be detected

And the detection angle range is small (generally less than 30 degrees)

[0004] For polymer blends in the early stage of phase separation, the range of angles that need to be detected is relatively large (between 30 and 90 degrees), or for polyolefin blends, due to the small difference in refractive index, even in the late stage of phase separation, The scattering signal is still very weak, and it is difficult to detect it with a general light scattering device

For example: the technical solution disclosed in Chinese patent 96116432.8 can only detect laser light scattering at small angles, but cannot detect large angles, and the detection sensitivity is not high

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