Device and method for measuring refractive index of low refractive index glass beads

Abstract

The invention discloses a device and a method for measuring the refractive index of low refractive index glass beads. A perforated reflector adjusting device and a camera five-dimensional adjusting device are adjusted, so that the center of a camera, the center of a light absorption device and a hole center of a perforated reflector are coaxial, a single-mode helium-neon laser emits laser light finally irradiating the glass beads after a series of transmission and reflection, a primary rainbow image is formed on a receiving screen, the camera acquires the image, the receiving distance from the glass beads to the receiving screen is measured, the radius of an outermost ring of a rainbow stripe of the rainbow image is measured, the minimum deviation angle of the primary rainbow image of the glass beads to be measured is calculated, and the refractive index is back calculated according to the minimum deviation angle.

Description

technical field [0001] The invention relates to a device and method for measuring the refractive index of low-refractive-index glass beads, belonging to the field of measurement technology. Background technique [0002] Glass beads are widely used in highways, railways, ports, ocean transportation, mines, tunnels, fire protection, urban construction and other fields as various signs, warning signs, vehicle license plates, life-saving supplies, etc.; with the rapid development of my country's highway construction, and The amount of glass beads used in conjunction with road retroreflective materials has increased rapidly. It is playing an increasingly important role in traffic safety products and facilities such as advertising signs, reflective film, reflective ink, reflective marking lines, reflective cloth, reflective leather, reflective webbing, and reflective safety silk fabrics. [0003] Glass microsphere is a silicate material with good chemical stability, mechanical str...

AI Technical Summary

Problems solved by technology

The main defects of this measurement device are: (1) Since the glass beads are adsorbed on the glass slide by adsorption, the three-dimensional adjustable bracket supporting the slide glass is likely to cause the glass beads to fall off during the adjustment process, and it cannot be continuously measured for many times. measurement to achieve statistical analysis; (2) the alignment of the laser and the glass beads is achieved by adjusting the long focal length positive lens and the slide glass respectively through the three-dimensional adjustable bracket, and the adjustment error increases the measurement error; (3) the formed Rainbow rings and related parameters, statistical analysis of measurement data cannot be realized

The main disadvantages of this measuring device are: (1) It can only measure high refractive index glass beads; (2) The position adjustment of the camera is not accurate, which is not conducive to the adjustment of the coaxial light

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