Thrubeam measuring instruments measure the outer diameter, height, width, or thickness of an object, etc. These instruments can also be used for runout, positioning, and dimension measurement. The measurement method includes: 1. Laser beam scans a target, and the target dimension is calculated based on the timing of the shadow produced due to laser beam interruption by the target. 2. A beam of light converges into a parallel beam and is projected onto a target. The shadow produced due to light being interrupted by the target is detected using a CCD image sensor or photodiode. Operating principles and features of devices using the laser scanning method and the CCD or photodiode method are described below.
Classification
Detection method
High-accuracy CCD method
Scanning method
CCD method
Two-dimensional CCD method
Features
High speed, high accuracy.
Transparent target measurement is possible.
High-speed resolution and high accuracy
Transparent target measurement is possible.
High-speed sampling
Simultaneous measurements at multiple points on a plane
Measurement of inner diameter, radius, angle, etc.