Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of Fresnel lens group for focusing of neutron small-angle scattering spectrometer

A Fresnel lens and small-angle scattering technology, which is applied in the field of preparation of Fresnel lens groups, can solve the problems of large lens thickness, low neutron transmittance, unfavorable and effective utilization, etc., and achieve the effect of expanding the experimental range

Active Publication Date: 2020-08-07
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After a neutron small-angle scattering spectrometer is built, the Q range of the spectrometer is determined, and the particle size range for measuring the scattered particles is basically determined. If the scattered particles exceed this range, the existing spectrometer cannot be completed, and the field usually uses The compound refractive lens group is used to expand the particle size range of the largest scattering particles that can be measured. However, since the compound refractive lens adopts biconcave lens technology, the thickness of a single lens is relatively large, resulting in an excessively large length of the lens group, resulting in a neutron transmittance of the entire device. Low, not conducive to the effective use of neutron sources

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of Fresnel lens group for focusing of neutron small-angle scattering spectrometer
  • Preparation method of Fresnel lens group for focusing of neutron small-angle scattering spectrometer
  • Preparation method of Fresnel lens group for focusing of neutron small-angle scattering spectrometer

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0044] The invention provides a method for preparing a Fresnel lens group for neutron small-angle scattering spectrometer focusing, the method comprising the following steps:

[0045] Step (1): Select N pieces of square or circular thin neutron optical materials as substrates. The basis for selection is a material with a small neutron absorption cross section and a large coherent scattering cross section, such as MgF 2 Single crystal, polytetrafluoroethylene, etc., the thickness of the sheet is generally about 1mm.

[0046] Step (2): Determine the focal length f of the lens group composed of N Fresnel lenses under the minimum Q layout of the neutron small-angle scattering spectrometer t：

[0047] figure 1 It is a schematic diagram of the minimum Q layout of the neutron small-angle scattering spectrometer. According to the lens imaging formula:

[0048]

[0049] (1) In the formula, L 1 is the distance from the neutron conduit exit of the neutron small-angle scattering s...

Embodiment 1

[0104] figure 1It is a schematic diagram of minimum Q layout of neutron small-angle scattering spectrometer using Fresnel lens group in a preparation method of Fresnel lens group for neutron small-angle scattering spectrometer focusing of the present invention, figure 2 It is a schematic diagram of the Fresnel lens in preparation. Combining with the minimum Q layout of the neutron small-angle scattering spectrometer (Suanni) at Mianyang Research Reactor in China, a Fresnel lens was fabricated. The minimum Q layout of Suan Ni and the focal length of the required focusing lens group are shown in Table 1:

[0105] Table 1 Suan Ni minimum Q layout and required focal length

[0106]

[0107] The prepared Fresnel lens material is selected as MgF 2 Single crystal, the shape of the substrate is circular, and its related parameters are shown in Table 2:

[0108] Table 2 MgF 2 Single Crystal Parameters

[0109]

[0110] The wavelength is The neutron, lens group composed o...

Embodiment 2

[0119] Each Fresnel lens sheet above is in accordance with The neutron wavelength is designed, and the prepared Fresnel lens sheets are also suitable for neutrons of other wavelengths. In the case of the minimum Q layout of Suanni, the required focal length of the lens group is 5.74m, and the Fresnel lenses required for different wavelengths The number of lenses is shown in Table 5:

[0120] Table 5 The number of focusing lenses used for the minimum Q layout of different wavelengths

[0121]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a Fresnel lens group for focusing of a neutron small-angle scattering spectrometer. According to the preparation method of the Fresnel lens group, underthe condition of minimum Q layout of a neutron small-angle scattering spectrometer, the focal length of a Fresnel focusing lens is determined, the number of lenses and the wavelength of incident neutrons are selected to determine the focal length of a single Fresnel lens, the curvature radius of a spherical or parabola-shaped concave lens is determined with the center of a wafer as the vertex ofthe concave lens, and then sawtooth-shaped vertex angles are manufactured on the periphery of the concave lens. The method is combined with a neutron small-angle scattering spectrometer based on a reactor and a spallation neutron source, and the neutron flux of the sample position can be enhanced under the minimum Q layout of the neutron small-angle scattering spectrometer.

Description

technical field [0001] The invention belongs to the field of neutron small-angle scattering experiments, and in particular relates to a preparation method of a Fresnel lens group used for neutron small-angle scattering spectrometer focusing. Background technique [0002] Small-angle neutron scattering is an important technique and method for studying submicroscopic structure and morphological characteristics. It has been widely used in polymers, biomacromolecules, condensed matter physics, and material science. The research fields involve alloys, suspended solids, and emulsions. , colloids, polymer solutions, natural macromolecules, liquid crystals, thin films, polyelectrolytes, composites, nanomaterials and fractals, etc. In developed countries, each research reactor has one or several neutron small-angle scattering spectrometers as an important technical means for material research. Neutron small-angle scattering mainly studies the parameters of microscopic particle size,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01J3/02G02B3/08G01J3/44
CPCG01J3/0208G02B3/08G01J3/4412
Inventor 陈良孙良卫刘栋李新喜王云
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com