Spectrophotometer for chromaticity detection of laser paper

Abstract

The invention discloses a spectrophotometer for the chromaticity detection of laser paper and belongs to the technical field of optical detection instruments. In the spectrophotometer disclosed by the invention, the spherical surface of a diffused lighting integrating sphere is provided with a sample reflecting hole, an incident hole of the diffused lighting integrating sphere and an exit hole of the diffused lighting integrating sphere; the spherical surface of a diffused accepting integrating sphere is provided with an incident hole of the diffused accepting integrating sphere and an exit hole of the diffused accepting integrating sphere; the exit hole of the diffused lighting integrating sphere and the incident hole of the diffused accepting integrating sphere are same in diameter and are in butt joint with each other; and the sample reflecting hole is connected with a laser paper sample, a flat-filed concave grating is arranged in front of a light path of the exit hole of the diffused accepting integrating sphere, a photoelectric converter, namely a linear array CCD (charge coupled device) is arranged in front of a dispersive light path of the flat-filed concave grating, and the electrical signal output end of the linear array CCD is connected with a signal processing system. The spectrophotometer disclosed by the invention is reasonable in design, simple in structure, and convenient in use, and can be used for correctly measuring the surface spectral reflectances and colorimetric values of all types of laser paper.

Description

technical field [0001] The invention belongs to the technical field of optical detection instruments, and in particular relates to a spectrophotometer for detecting the chromaticity of laser paper. Background technique [0002] In the prior art, as a color measuring instrument, a spectrophotometer can measure the spectral reflectance of a sample and calculate chromaticity data such as tristimulus values, but the existing spectrophotometer is designed for ordinary paper or textiles, and is not suitable for laser Colorimetric testing of paper. There are two main types of lighting / accepting conditions for existing colorimetric spectrophotometers: 45° / 0° and D / 8°. These two types of spectrophotometers can correctly measure the spectrum of ordinary paper such as white cardboard and coated paper. and chromaticity data. However, these two lighting / accepting conditions are fixed-angle lighting or fixed-angle acceptance, which cannot eliminate the influence of the color change of t...

AI Technical Summary

Problems solved by technology

However, these two lighting / accepting conditions are fixed-angle lighting or fixed-angle acceptance, which cannot eliminate the influence of the color change of the laser paper grating at different angles, resulting in the measurement data of these two types of colorimeters at different angles at the same point on the laser paper The difference is very large, and the instruments of the prior art cannot correctly measure the spectral reflectance and chromaticity data of the laser paper

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