Length measurement method and device and storage medium

The embodiment of the invention provides a length measurement method, and the method comprises the steps: receiving a first reflection signal which is a reflection signal generated when a first ultrasonic guided wave is transmitted in a first calibration object; processing the first reflected signal to determine a second ultrasonic guided wave; based on the second ultrasonic guided wave, determining the propagation speed of the second ultrasonic guided wave in the to-be-measured object, and determining the propagation time of the second ultrasonic guided wave in the to-be-measured object; and determining a first length of the to-be-measured object based on the propagation speed and the propagation time. According to the method provided by the embodiment of the invention, the length can be conveniently and quickly measured, and the environmental interference resistance is relatively high. 本申请实施例提出一种长度测量方法，该方法包括：接收第一反射信号，第一反射信号为第一超声导波在第一标定物中传播时的反射信号；对第一反射信号进行处理，确定第二超声导波；基于第二超声导波，确定第二超声导波在待测物体中的传播速度，以及确定第二超声导波在待