Do vibration and scan speeds cause inaccuracies when using a laser-based system to measure the diameter change on a mock artery?
Theoretically, there can be some error associated with lateral vibrations in the mock artery. This error would be a function of the laser beam sweep velocity (faster is better) and the mock artery lateral vibration velocity (slower is better) which is also a function of the vibration frequency and amplitude. To characterize what the error associated with lateral vibration could be, Bose ESG has outlined a hypothetical worst-case scenario. The following represents a lateral vibration condition that would be very obvious and easy to correct: • 8 mm mock artery running at 60 Hz • Measured compliance 5% • Lateral vibration frequency 20 Hz (1/3 harmonic) • Lateral vibration amplitude 1 mm • Laser scan velocity 121 m/sec (1200 Hz) If an error analysis is run to determine the sinusoidal displacement errors, these conditions would produce an error reading of ± 0.05% strain. This would be considered insignificant.
