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Related Concept Videos

Electronic Distance Measuring Instruments01:30

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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Distance Corrections

To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...

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Related Experiment Video

Updated: Jun 17, 2026

Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon
07:22

Fabrication of a Low-Cost, Fiber-Coupled, and Air-Spaced Fabry-Pérot Etalon

Published on: February 3, 2023

Interferometric techniques for measuring dimensional stability of passive etalons.

C F Bruce, R M Duffy

    Applied Optics
    |January 16, 2010
    PubMed
    Summary

    This study details methods for measuring the dimensional stability of Fabry-Perot etalons using low expansion materials. High precision measurements, traceable to the Krypton 86 standard, achieve an order of 1 part in 10(8).

    Area of Science:

    • Metrology and Optical Engineering
    • Materials Science

    Background:

    • Passive Fabry-Perot etalons are critical optical components.
    • Dimensional stability is crucial for precision applications.
    • Low expansion materials are often employed to minimize thermal drift.

    Purpose of the Study:

    • To present novel methods for assessing the dimensional stability of passive Fabry-Perot etalons.
    • To investigate etalons utilizing spacers made from low expansion materials.
    • To establish measurement precision relative to primary length standards.

    Main Methods:

    • Employing interferometric techniques to monitor optical path length changes.
    • Utilizing a Krypton 86 primary length standard for calibration.
    • Defining measurement precision as the ratio of optical length (L) to the smallest detectable change (ΔL).

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    Main Results:

    • Demonstrated a method for investigating dimensional stability.
    • Achieved measurement precision on the order of 1 part in 10^8.
    • Validated the use of low expansion materials for stable etalon construction.

    Conclusions:

    • The described methods provide high-precision assessment of etalon dimensional stability.
    • Traceability to the Krypton 86 standard ensures measurement accuracy.
    • Low expansion materials are suitable for fabricating dimensionally stable Fabry-Perot etalons.