Laser Lamb wave compressed sensing reconstruction method based on adaptive algorithm

• Main Authors: WU BIN, LIU ZENGHUA, WANG SHUANGQUAN, HE CUNFU
• Format: Patent
• Language: Chinese; English
• Published: 10.07.2020
• Subjects: BASIC ELECTRONIC CIRCUITRY; CODE CONVERSION IN GENERAL; CODING; DECODING; ELECTRICITY

The invention discloses a laser Lamb wave signal compressed sensing reconstruction method based on an adaptive algorithm, and belongs to the technical field of laser ultrasonic nondestructive testing.Firstly, a laser Lamb wave ultrasonic signal is obtained through a signal acquisition system, the signal is projected on a measurement matrix, and a linear observation signal is obtained; different measurement numbers M are used, signals are reconstructed through an adaptive orthogonal matching pursuit algorithm, and along with increase of observation values, the reconstruction precision of the signals is improved. the reconstruction effect of the signal is objectively evaluated by utilizing a performance evaluation standard of signal reconstruction. According to the method, the adaptive orthogonal matching pursuit algorithm is adopted to reconstruct the laser Lamb wave signal, variable step length and adaptive characteristics are added on the basis of a traditional compressed sensing algorithm, the reconstructio