Related Experiment Video
Updated: Jun 3, 2026
10:12
Three Dimensional Vestibular Ocular Reflex Testing Using a Six Degrees of Freedom Motion Platform
Published on: May 23, 2013
Remote non-contact vibration and displacement measurement via 3D ellipse fitting
Optics Letters
|June 1, 2026
Abstract
None:
This paper presents a laser interferometric method based on 3D-EFA for high-precision displacement and vibration measurement. Using three DFB lasers (1540.600, 1549.360, and 1558.160 nm) and a dual-cavity EFPI sensor, rapid displacement and remote vibration measurement were demonstrated via a PZT driven by a signal generator. The 3D-EFA algorithm enables stable demodulation with <0.3% error while maintaining robust performance over extended standoff distances, significantly improving speed and accuracy.
Related Concept Videos
01:30Electronic Distance Measuring Instruments
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...
01:18Distance Measurements by Taping
Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...