Definition measuring device

Abstract

The invention discloses a definition measuring device which comprises a first light source system, an imaging system and a first detector. A to-be-measured sample is arranged between the imaging system and the first detector or between imaging elements of the imaging system. A light-emitting light source or a light outlet of the first light source system conducts imaging on the detecting face of the first detector after passing through the imaging system. The first detector is a one-dimensional linear array detector or a two-dimensional surface array detector. The small subtense angle of the light source and detecting pixels relative to the sample is achieved in a compact size, the standard definition measurement is achieved, the light distribution of incidence light and transmission light of the to-be-measured sample can be tested and compared through the array detector, the angle scattering characteristic of the to-be-measured sample is more detailedly measured, and the definition measuring device has the advantages of being high in precision, high in speed and compact in size and is suitable for measurement and comparison of definition of various samples with different scattering characteristics.

Description

【Technical field】 [0001] The invention relates to an optical measuring device, in particular to a sharpness measuring device. 【Background technique】 [0002] Translucent and transparent products are widely used, and related products include glass, plastic film, plastic bottles, etc. Different application requirements have different requirements on the optical performance of the product; for example, the transparent film used to package the product needs good transparency so that the items in the package can be clearly identified. At present, parameters such as light transmittance, clarity (Clarity) or transparency, and haze (Haze) are generally used in the industry to evaluate the optical properties of translucent or transparent objects. The higher the clarity and the smaller the haze, the better the transparency of the item. Therefore, accurate measurement of parameters such as haze and clarity of translucent and transparent products is of great significance for research ...

AI Technical Summary

Problems solved by technology

Although the inventive device provides a solution for the measurement of sharpness, this solution cannot completely reflect the scattered light distribution information within the entire 2.5°, and it is difficult to realize the sharpness measurement conditions required by the standard. The distance between the detectors is 50cm as an example. The size of the light-receiving surface of the central detector for measuring regular transmission should be within 0.87mm, while the outer diameter of the ring detector should be within 21.8mm. The existing single-channel detector technology can hardly meet this requirement. ; More importantly, due to the small beam angle of the collected measurement in the sharpness measurement, the requirements for beam alignment are also very high; if the mechanical vibration or optical path adjustment is not enough, the very small alignment deviation will also affect the final measurement. Results make a difference

Moreover, for samples whose scattering properties are different from those of standard samples, the measurement error of this method will be very large, which will affect the evaluation and comparison of sample clarity.

In addition, in traditional sharpness and sample diffuse transmission measurements, it is generally necessary to switch the position of the receiving aperture or rotate the receiver to achieve distribution measurement, which takes a relatively long time and is not efficient. The accuracy of the

Images