Apparatus and method for measuring glass micro-bead refractive index

Abstract

The invention relates to a method and an apparatus for measuring the glass micro-bead refractive index. According to the present invention, when the refractive index of a high-refractive index glass micro-bead is measured, a reflecting mirror adjustment device and a camera five-dimensional adjustment device are adjusted so as to make the camera center, the light absorption center, and the hole center of the reflecting mirror having the hole coaxial, a single-mode He-Ne laser emits laser, the laser finally irradiates onto the glass micro-bead through a series of reflections and transmissions, a secondary rainbow image is obtained on a receiving screen, the camera collects the image, the receiving distance from the glass micro-bead to the receiving screen is measured, the radius of the outermost ring of the rainbow stripes is measured, the minimum deviation angle of the secondary rainbow of the glass micro-bead to be measured is calculated, and the refractive index is calculated through inversion of the minimum deviation angle; and when the refractive index of a low-refractive index glass micro-bead is measured, a spring locking device is opened, the instruments are adjusted so as to make the system in which the camera, the receiving screen and other devices exist rotate 90 DEG, the fixation is performed through a support frame, other steps are the same as the steps for measuring the refractive index of the high-refractive index glass micro-bead, and the minimum deviation angle of the primary rainbow of the glass micro-bead to be measured is calculated so as to calculate the refractive index through the inversion.

Description

technical field [0001] The invention relates to a device and method for measuring the refractive index of 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 strength and electrical ...

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 through 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 defects of this measuring device are: (1) only high refractive index glass beads can be measured; (2) the position adjustment of the camera is inaccurate, which is not conducive to the adjustment of the coaxial light

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