Research on measurement of film thickness of lithium battery by laser in unknown noise environment

Factors affecting the on-line detecting thickness of lithium battery pole by laser sensor are mainly the accuracy of the sensor, the inherent frequency and dynamic error of the C scanning mechanism. Improved highly redundant optimal atomic parameters for the thickness of lithium battery pole piece under different circumstances are obtained. The best atomic parameters are extracted in the training phase to construct the sub-optimal atomic function. The results show that, compared with wavelet algorithm and conventional sparse decomposition algorithm, the improved sparse decomposition algorithm has better denoising performance under the condition of lacking prior knowledge.