Dimension measuring device for optical standing wave nano-particles

Abstract

The invention relates to a dimension measuring device for optical standing wave nano-particles. The prior art has low measurement accuracy and has high requirement on measurement environment. The device comprises a laser light source, a beam expanding collimator, an isosceles prism, a first reflecting mirror, a second reflecting mirror, a first focusing lens, a second focusing lens, a phase regulator, a plano-convex lens, a convergence objective and a photoelectric sensor. Two beams, which are reflected by two isosceles surfaces of the isosceles prism, of a laser beam pass through the reflecting mirrors and the focusing lenses respectively and then are intersected to form an interference area; a plane of the plano-convex lens arranged at the intersection of the beams is positioned in the interference area, and nano-particles are arranged on the plane; the phase of one beam is changed through the phase regulator to cause interference fringes to move, and the scattering light intensity of the nano-particles synchronously has intensity change; and the photoelectric sensor detects the scattering light intensity of the nono-particles, and sizes of the nano-particles are measured by calculating light intensity contrast. The device has the characteristics of no interference of granular materials, high measurement accuracy, low requirement on measurement environment, wide application and the like.

Description

technical field [0001] The invention belongs to the field of optical technology, and relates to a measuring device, in particular to an optical standing wave nano particle size measuring device, which is mainly used for measuring the size of nano tiny particles. technical background [0002] Nanotechnology has aroused people's widespread attention. Nanotechnology has greatly promoted the development of many fields such as industry and agriculture, medical and health care, life sciences, and environmental safety, and has become one of the main driving forces for social development. At present, the nanomaterials industry is booming and has initially formed a large-scale industry. The particle size of nanomaterials has an important impact on nanomaterials. How to quickly and accurately measure the particle size of nanomaterials has always been the most concerned issue in nanomaterials research. It has been widely valued by people and has gradually developed into a modern measur...

AI Technical Summary

Problems solved by technology

Although this method has certain advantages, there are still some deficiencies in principle. The light beam is a far-field light traveling wave light beam, and the detection accuracy is greatly affected by the characteristic parameters of the light beam, which affects the measurement accuracy; the intensity of scattered light and the fluctuation of light intensity are related to the characteristics of particle materials (such as Permittivity, permeability, conductivity and other parameters) are directly related, and it is impossible to eliminate the influence of particle material characteristics on the measurement accuracy of the light scattering method in the prior art, and the measurement method and system are complicated.

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