关键词: 微型光谱仪, 可溶性染液, 浓度, 在线检测, PLS模型

Abstract: With the advancement and expansion of the printing and dyeing market, China has emerged as the world's leading textile producer and trading nation. In the textile industry, color serves as a crucial parameter for evaluating textile quality. During factory production, the concentration of dyes in the dyeing process primarily influences the color of textiles. Therefore, to ensure accurate color reproduction, it becomes imperative to monitor the dyeing status within the dye solution and continuously detect its concentration in real-time throughout the dyeing process to guarantee optimal printing and dyeing outcomes. Traditional methods for determining dye concentration include titration, gravimetry, density measurement, etc., all of which rely on manual sampling resulting in random errors and limited real-time performance. Currently employed techniques for measuring dye concentration encompass spectrophotometry, fluorescence analysis, high-performance liquid chromatography, and comprehensive flow injection analysis. Among these methods, spectrophotometry stands out due to its exceptional sensitivity levels along with simple operation procedures that are rapid yet non-destructive. However, this technique necessitates expensive equipment that is bulky in size while also demanding high technical proficiency from operators.
In this paper, a device for detecting the concentration of soluble dye solutions was designed based on the fundamental principles of spectrophotometry and C12666MA micro-spectrometer. The device was tested with dye solutions prepared using acid bright red B, acid dark blue 5R, and acid light yellow G to obtain the light intensity of monochromatic light passing through the dye solution. A PLS model was established to detect the concentration of the dye solution in real time using the micro-spectrometer. It was found that the performance of the PLS model based on partial light intensity data ranging from 400 nm to 700 nm outperformed that of a full-band light intensity-based PLS model. The error between the detected concentrations by our device and actual concentrations is less than 5%, indicating high accuracy. Compared to traditional manual methods for concentration detection, our device offers improved automation, simplicity in operation, lower cost, and smaller size.
The current concentration detection device for soluble dye solutions is still in the developmental stage, with limited practical applications. This paper presents an online concentration detection device specifically designed for soluble dye solutions, enabling real-time monitoring of dye solution concentrations. This device ensures the quality of printing and dyeing production while meeting the requirements for intelligent and environmentally-friendly production processes. Moreover, it serves as a valuable reference for the development of automated detection equipment for dye solution concentrations.

Key words: micro-spectrometer, soluble dye solution, concentration, on-line detection, PLS model