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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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Implementation of a Reference Interferometer for Nanodetection

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Double sinusoidal phase-modulating laser diode interferometer for distance measurement.

O Sasaki, T Yoshida, T Suzuki

|August 14, 2010

Summary

This summary is machine-generated.

Sinusoidal phase-modulating interferometry precisely measures phase variations in interference signals, even with amplitude changes. This technique enhances distance measurement resolution, enabling precise thickness measurements of gauge blocks.

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Last Updated: Jun 10, 2026

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Area of Science:

Optics and Photonics
Metrology
Interferometry

Background:

Interference signals in interferometry can be affected by amplitude variations due to factors like injection current modulation.
Mechanical vibrations often introduce phase fluctuations, limiting measurement precision.
Improving the resolution of distance measurements is crucial for various scientific and industrial applications.

Purpose of the Study:

To present a method for accurately detecting sinusoidal phase variations in interference signals, irrespective of amplitude modulation.
To demonstrate the integration of a feedback control system for stabilizing interferometers against mechanical vibrations.
To enhance the resolution of distance measurements using sinusoidal phase-modulating interferometry.

Main Methods:

Utilizing sinusoidal phase-modulating interferometry to detect phase variations.
Implementing a feedback control system to mitigate phase fluctuations from mechanical vibrations.
Applying the enhanced interferometry technique for high-resolution distance measurements.

Main Results:

Accurate detection of sinusoidal phase variation was achieved, even with amplitude modulation of the interference signal.
The feedback control system effectively eliminated phase fluctuations caused by mechanical vibrations.
Distance measurements were significantly improved, with experimental results showing a resolution of approximately 0.5 micrometers for gauge block thickness.

Conclusions:

Sinusoidal phase-modulating interferometry offers a robust method for precise phase detection in interferometric systems.
The integration of feedback control enhances the stability and reliability of interferometric measurements.
This technique significantly advances the resolution capabilities for precise distance and thickness measurements.