The test requires measuring the width and height difference of the pipe thread

      （As shown above）

First of all, the measured object is fixed, the 90-degree lens position is fixed, and the motion scan is measured from left to right inside the tube

Sampling frequency 3000Hz, scanning step 2μm start scanning

（Repeatability data for 30 measurements）

In this test, the D35A18R4S25-90 lens of LYometer Technology was used to scan the upper surface outline of the internal thread of the sample. The lens dynamic scanning test was conducted with a sampling frequency of 3000Hz/s to scan the upper surface outline of the thread with a precision range of 8.5um for 30 repeats. The measuring range of the 90-degree lens was 8mm, which could cover the depth and width of the detection thread. Non-contact measurement method, non-destructive sample.