KEYWORDS: Hyperspectral imaging, Reflectivity, Detection and tracking algorithms, Data processing, Principal component analysis, Data modeling, Performance modeling
The storage conditions for paper cultural relics entail strict requisites. Any alterations to the storage conditions can lead to the proliferation of diseases, with mould being particularly prevalent and causing discoloured splotches on the surface of the relics. The resultant physical and biological damage is severe. In this study, we examine the differences in spectral characteristics between moldy and healthy areas in paper cultural relics samples. We used hyperspectral imaging technology, known for its non-destructive and fast features, to set up a discrimination model for phytophotocyanobacteria based on KNN (K-nearest neighbor), SVM(Support Vector Machine), 2D-CNN and VVG16, and evaluated the performance of the model by comparing the mold identification rate between different models to screen the optimal modelling scheme. The primary contributions of this paper are the amalgamation of hyperspectral imaging technology with mold spot detection of cultural relics on paper.
In order to solve the problems of low localization rate and poor stability of laser ranging system, a system based on the TDC-GP22 timing unit and the pulsed laser ranging method in the time-of-flight (TOF) method is designed to realize laser ranging. The domestic AL0905P75WT18-03FW laser diode and power MOS tube are used as the laser transmitter module to realize the high stability of laser emission, and the domestic AA-S0905 L0500 LCC3-2-B avalanche diode is used as the laser detector to convert the optical signal into current signal, which is further processed by amplification, filtering and so on and then passed through the TDC-GP22 to realize the laser distance measurement. After further processing, the light signal is converted into current signal through amplification, filtering and other further processing, through TDC-GP22 timing, thus realizing laser distance measurement. The system adopts domestic light source and photodetector, domestic voltage regulator chip, operational amplifier and FPGA chip, which improves the reliability, stability and autonomy of the system.
In view of the damage that cannot be detected during the long-term operation of the elevator wire rope, the system adopts a magnetic detection method by comparing several representative non-destructive testing methods for ferromagnetic material damage. By establishing the wire rope leakage magnetic field analysis model, the U-shaped sensor array and the corresponding signal acquisition and pre-processing circuits are designed. Through practice, the non-destructive testing scheme of the wire rope proposed in this paper can provide monitoring and guarantee for the safe operation of the elevator. At the same time, it can also provide a reference for the maintenance and management of other on-site wire ropes in China.
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