What is the data acquisition frequency of the laser and how does it relate to accuracy?
The laser scans at 1200 Hz. If a test is running at 60 Hz, the data is acquired at 20 samples per cycle. If data is taken only over one cycle, the possible error could be as high as 1.2%. However, using the ElectroForce SGT, data is taken over a large sample of the maximum and minimum readings over a period of several seconds to determine the maximum and minimum diameter. Bose ESG has verified the accuracy of this approach using a spinning oval at 3600 RPM.
