Method for dynamically monitoring content of rare earth element component based on time-series feature

A method for dynamically monitoring the content of a rare earth element (REE) component based on a time-series feature, wherein the monitoring method comprises the following steps:

• collecting sample solutions in different periods under different working conditions at a rare earth (RE) production site;
• obtaining a component content of each sample solution through an offline laboratory test;
• obtaining a sample image of each sample solution through an image information acquisition device;
• establishing a sample data set that comprises the component content and sample image of each sample solution;
• determining a weight of a hue, saturation and intensity (HSI) color space and a weight of a YUV color space for color space fusion based on the sample data set;
• determining an expected interval of a mixed color space according to the weight of the HSI color space and the weight of the YUV color space based on the sample data set;
• using the image information acquisition device to periodically acquire a time-series image of the RE solution to be monitored;
• extracting a time-series feature of the time-series image by using a principal component analysis (PCA) method in the mixed color space according to the weight of the HSI color space and the weight of the YUV color space, to obtain a time-series feature value of the time-series image;
• determining whether the time-series feature value of the time-series image is in the expected interval of the mixed color space, to obtain a determination result;
• calculating a histogram intersection distance between the time-series image and the sample image in the sample data set in a hue, saturation and value (HSV) color space, determining the content of the REE component corresponding to the time-series image according to a component content corresponding to a sample image with a larger histogram intersection distance, returning to the step of “using the image information acquisition device to periodically acquire a time-series image of the RE solution to be monitored”, and waiting for the acquisition of a time-series image at a next sampling time point, if the determination result indicates no;
• and
• returning to the step of “using the image information acquisition device to periodically acquire a time-series image of the RE solution to be monitored”, and waiting for the acquisition of a time-series image at a next sampling time point, if the determination result indicates yes.