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Electronic Distance Measuring Instruments

Electronic 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...

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Updated: Jun 28, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

Enhanced Data-Processing Algorithms for Dispersive Interferometry Using a Femtosecond Laser.

Tao Liu¹, Hiraku Matsukuma¹, Amane Suzuki¹

¹Precision Nanometrology Laboratory, Department of Finemechanics, Tohoku University, Sendai 980-8579, Japan.

Sensors (Basel, Switzerland)

|January 23, 2024

Summary

This summary is machine-generated.

Two new algorithms enhance dispersive interferometry for accurate distance measurements. These methods significantly reduce measurement errors and eliminate the dead zone, improving absolute distance measurement capabilities.

Keywords:

absolute distance measurement dispersive interferometry inverse Fourier transform

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Last Updated: Jun 28, 2026

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Area of Science:

Optics and Photonics
Metrology
Laser Technology

Background:

Dispersive interferometry using femtosecond lasers offers high-accuracy absolute distance measurements.
Conventional methods face limitations like dead zones and inherent theoretical deviations, restricting measurement range and precision.

Purpose of the Study:

To propose and validate two novel data-processing algorithms for dispersive interferometry.
To enhance measurement accuracy and reduce or eliminate the dead zone in absolute distance measurements.

Main Methods:

Development of a truncated-spectrum algorithm to mitigate deviations from direct inverse Fourier transforming.
Introduction of a high-order-angle algorithm to address the unmeasurable dead zone near zero position.
Experimental validation using a dispersive interferometer setup with interference spectral signals.

Main Results:

The truncated-spectrum algorithm reduced output distance deviations by eight times, achieving accuracy as low as 1.3 μm.
The high-order-angle algorithm successfully shortened the dead zone to 22 μm, expanding the measurable distance range.
Simulations and experiments confirmed the improved performance of both proposed algorithms over conventional methods.

Conclusions:

The proposed truncated-spectrum and high-order-angle algorithms significantly improve the accuracy and range of dispersive interferometry.
These algorithms effectively address the dead zone limitation and reduce measurement deviations, advancing absolute distance measurement technology.