Measuring device and method for refractive index distribution of ice layer in ICF pellet
A technology of refractive index distribution and measuring device, which is applied in the direction of measuring device, phase influence characteristic measurement, analyzing materials, etc., can solve the problems of adjustment error, complex rotating mechanism of target pellet, and no refractive index distribution given.
Active Publication Date: 2020-06-16
ZHEJIANG UNIV
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However, this method does not give the final refractive index distribution, and needs to use confocal scanning area by area, which is very time-consuming and difficult to achieve online detection; in addition, the rotation mechanism of the target is complicated, requires high hardware requirements, and will introduce adjustment errors , thus affecting the final detection result of refractive index distribution
The above detection methods have no final results for the characterization of the refractive index distribution of the ice layer in the target capsule
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[0046] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the following embodiments are intended to facilitate the understanding of the present invention, but do not limit it in any way.
[0047] Such as figure 1 As shown, a device for measuring the refractive index distribution of the ice layer in the ICF target capsule, fiber laser 1, fiber collimator 2, first polarization beam splitter 3, PZT with plane mirror 4, unpolarized beam splitter Mirror 5, second polarizing beam splitter 6, target pellet 7 to be measured, lens 8, linear polarizer 9, CCD image sensor 10, high power LED 11, aperture 12 and computer 13.
[0048] The fiber laser 1, the fiber collimator 2, the first polarizing beam splitter 3, and the plane reflector 4 carried on the PZT are placed in sequence along the same horizontal line, and the fiber head of the fiber laser 1 is inserted into the optical port of the fi...
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The invention discloses a measuring device and a measuring method for refractive index distribution of an ice layer in an ICF pellet. The measuring device comprises an optical fiber laser, an opticalfiber collimating mirror, a first polarization beam splitter, a PZT (piezoelectric ceramic) loaded with a reflector, a beam splitter, a second polarization beam splitter, a to-be-measured pellet, an imaging mirror, a linear polarizer, a CCD image sensor, an LED, a diaphragm and a computer. The measuring method comprises the following steps of: positioning the pellet by using a backlight projectionlight path, and acquiring a four-step phase-shifting interferogram of the pellet by means of an interference light path; carrying out phase unwrapping, unwrapping, Zernike fitting and other operations on the phase-shifting interferogram, and selecting two similar annuluses on the obtained wave surface; utilizing an inversion method based on OPD for sequentially solving an annulus refractive indexand a reference refractive index, and therefore acquiring refractive index distribution; and applying coordinate transformation again to obtain the refractive index distribution of a pellet coordinate system. By utilizing the measuring device and the measuring method, rapid and non-contact measurement can be realized.
Description
technical field [0001] The invention belongs to the technical field of optical precision measurement, and in particular relates to a measuring device and method for the distribution of the refractive index of the ice layer in an ICF target pellet. Background technique [0002] Inertial Confinement Fusion (ICF) requires multiple beams of high-energy pulsed lasers to be uniformly irradiated on the target pellet at the same time to produce a uniform implosion, thereby inducing nuclear fusion. The target pellet is a multi-layer spherical shape composed of spherical shell, ice layer and fuel gas. During the process of ice layer condensation, the inner surface of the ice layer may be too rough, and there may be air chambers inside each layer. These inhomogeneities can be characterized as the inhomogeneity of the ice layer thickness and refractive index distribution of the pellet, respectively. This inhomogeneity would result in a non-uniform implosion that would fail to induce fu...
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IPC IPC(8): G01N21/41
CPCG01N21/41G01N2021/418
Inventor 刘东严天亮陈楠卢岸胡晓波臧仲明张鹄翔
Owner ZHEJIANG UNIV