Online detection device for optical film

Abstract

The invention discloses an online detection device for an optical film. The online detection device comprises an encoder, a front signal processing module, an FPGA (Field Programmable Gata Array) signal processing module, more than two driving modules and linear array CCD (Charge Coupled Device) cameras, wherein the FPGA signal processing module comprises a synchronous detection circuit and a signal selecting circuit; and a signal output by the encoder passes through the front signal processing module, is subjected to synchronous detection and signal selection in the FPGA signal processing module, and is distributed to a multi-path driving module to control the linear array CCD cameras connected with the driving module to work. Driving signals of a plurality of linear array CCD cameras come from the same encoder, so that the problem of signal source consistence of control signals is solved, and the signal synchronism is high. Synchronous signal subdivision is performed by using the synchronous detection circuit in the FPGA signal processing module, so that the signal synchronism is further enhanced, gray level images with high synchronism are provided for an image processing module, and image distortion is reduced.

Description

technical field [0001] The invention relates to an optical film production detection device, in particular to a multi-channel, high-precision optical film on-line detection device using visual detection. Background technique [0002] In the preparation process of optical film, due to reasons such as thin film thickness and many production processes, various stains, gels, scratches, wrinkles, breakage, uneven coating, bubbles and other defects often appear, which affect the optical properties of the optical film. Therefore, the quality of the film must be detected in real time during the production process to feed back to the corresponding control unit to adjust the process parameters. [0003] The method of defect detection using machine vision has unique advantages such as non-contact, fast, high precision and intelligence, and has been more and more widely used in recent years. The process is as follows: Firstly, multiple industrial CCD cameras collect grayscale images of...

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to provide a high-precision, multi-channel optical film online detection device, which can solve the problems of poor synchronization of image data collected by multiple line array CCD cameras, inaccurate positioning, and image distortion.

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