Digital signal processor (DSP) based linear array charge coupled device (CCD) online detection system for absorbable suture line diameter

Abstract

The invention relates to a digital signal processor (DSP) based linear array charge coupled device (CCD) online detection system for absorbable suture line diameter. The DSP based linear array CCD online detection system for absorbable suture line diameter comprises structural members and a system circuit. The structural members include a light source support, a CCD support, guide wheels and a guide rail. The guide wheels and the guide rail are fixed to the surface of a platform of a wet spinning machine. A linear array CCD comprises a linear array CCD module and a casing; a plug rod B is arranged at the bottom of the casing and is in close fit with a central slot of a holder B. A telecentric lens is mounted at the front end of the linear array CCD and provided with a shading device. The shading device consists of a lens hood and a shade piece. The system circuit consists of an optical imaging module, a linear array CCD drive module, a high-speed analog / digital (A / D) data acquisition and DSP digital signal processing module. Compared with the conventional measurement method, the DSP based linear array CCD online detection method for the absorbable suture line diameter has the advantages that the line diameter can be detected in real time accurately during production and twisting of absorbable sutures, a DSP controller output end provides detection data for a spinneret mechanism and a tension control system to realize closed-loop control of spinneret pressure and stretch tension, thus the produced sutures have good uniformity.

Description

technical field [0001] The invention relates to the fields of measuring instruments, sensors and signal processing, and medical equipment, in particular to a DSP-based linear array CCD high-speed online detection system for online measurement of the diameter of absorbable sutures. Background technique [0002] my country's medical suture has a market demand of about 1.5 billion yuan per year, but the localization rate is less than 40%. Wet spinning is the main forming process of absorbable sutures. During the forming and winding process of sutures, whether the wire diameter remains uniform affects the absorption period of sutures and the key technical indicators of tensile strength, which is related to the quality and quality of sutures. quality. [0003] The domestic traditional method is to use a wire diameter measuring instrument to detect the diameter of the finished suture thread. The measurement accuracy is 0.002mm, which is relatively high, but it belongs to offline ...

AI Technical Summary

Problems solved by technology

[0004] At present, there are a large number of filament diameter measurement problems in the industrial field. The online measurement methods commonly used are (1) contact measurement method, which has the advantage of high measurement accuracy, but is prone to deformation, which has an impact on the production process, and cannot detect the measured Out-of-roundness and inhomogeneity of wire

(2) The photodiode array measurement method has the advantages of fast measurement speed and easy handling, but low measurement accuracy

(3) High-precision linear array CCD measurement system, the processor generally adopts single-chip microcomputer and ARM, and its disadvantage is: the data processing ability cannot meet the requirements for high-speed online measurement

[0005] Therefore, the market needs an online detection system for the diameter of absorbable sutures with high measurement accuracy and fast measurement speed, but there is no relevant technology reported in the literature so far.

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