Workpiece thickness detection method based on improved peak recognition

The invention discloses a workpiece thickness detection method based on improved peak recognition. The method comprises the following steps: step one, calculating a propagation speed of an ultrasonicecho signal in a workpiece; step two, setting a wave crest starting position for the acquired ultrasonic echo signal waveform of the measured workpiece, determining the position of a point corresponding to a maximum value after the position as a first wave crest point, setting a minimum distance between peaks, determining a maximum value according to the position of the first peak point plus the distance as the position of a second wave crest point, and acquiring a time difference t' between two wave crest points based on the positions of the two adjacent wave crest points, and calculating a thickness value of the measured workpiece; step three, stopping a gate at a previous position under the condition of changing the waveform greatly, that is, changing the thickness suddenly and only measuring a last thickness v