Method and device for measuring refractive index and thickness of ice layer in ICF pellet

Abstract

The invention relates to a method and a device for measuring the refractive index and the thickness of an ice layer in an ICF pellet. The device comprises a light source (a laser or an LED), a beam expander, a beam splitter, a first reflector, a second reflector, a pellet to be measured, a wavefront sensor, a lens, a CCD image sensor and a computer. Through the device, an optical path is divided into two paths, and in combination with the two optical paths, the average refractive index of the ice layer is worked out on the basis of the known average thickness of the ice layer; the average thickness of the ice layer is worked out on the basis of the known average refractive index of the ice layer; therefore, the refractive index and the thickness of the ice layer of the pellet are acquired. Through the method and the device, a double-optical path system and a double-optical path method which are based on optical path difference and ray deflection are provided, and simultaneous measurement of the refractive index and the thickness of the ice layer of the ICF pellet is achieved; fast and non-contact measurement can be achieved, and the measurement accuracy is high; the refractive index distribution of the ice layer of the pellet can be acquired.

Description

Technical field [0001] The invention belongs to the technical field of optical precision measurement, and relates to a method and device for measuring the refractive index and thickness of the ice layer in an ICF target pellet. Background technique [0002] Inertial confinement nuclear fusion (ICF) is one of the mainstream solutions to achieve controllable nuclear fusion, and it has great significance in nuclear fusion research. As the core of all N laser beams converging and implosing to induce nuclear fusion, the target pellet has extremely stringent requirements on the smoothness, concentricity and uniformity of its inner surface. For this reason, it is very important to implement quality control. [0003] Since the target pellet is a multi-layer sphere composed of a spherical shell, ice layer and fuel gas, it will be severely deflected after passing through the parallel light, and its size generally ranges from a few hundred um to a few mm, which is between macro and micro Th...

AI Technical Summary

Problems solved by technology

And because the assumption will introduce errors, the final ice thickness will also have a large error

The above detection methods cannot accurately measure the refractive index and thickness of the ice layer in the ICF target pellet at the same time

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