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Distance Corrections01:15

Distance Corrections

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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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Two-wavelength double heterodyne interferometry using a matched grating technique.

Applied optics·2010
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Related Experiment Video

Updated: Dec 25, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Uplink wavefront corrector system: from paper to reality.

N Martínez Rey, L F Rodríguez Ramos, Z Sodnik

    Optics Express
    |April 1, 2020
    PubMed
    Summary

    The Uplink Wavefront Corrector System (UWCS) demonstrates adaptive optics for free-space optical communications and laser guide star generation. This system corrects atmospheric distortions for improved laser beam quality.

    Area of Science:

    • Optical Engineering
    • Astronomy
    • Adaptive Optics

    Background:

    • Atmospheric turbulence distorts laser beams, limiting free-space optical communication and laser guide star (LGS) applications.
    • Adaptive Optics (AO) techniques can correct these wavefront aberrations.
    • A novel application of AO for uplink correction is needed.

    Purpose of the Study:

    • To design, integrate, and test the Uplink Wavefront Corrector System (UWCS).
    • To demonstrate the feasibility of uplink AO correction for free-space optical communications and LGS generation.
    • To assess the performance of the UWCS in terms of beam power concentration.

    Main Methods:

    • Utilized a Shack-Hartmann Wavefront Sensor (WFS) with 12x12 sub-apertures to measure atmospheric aberrations using a Natural Guide Star.

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  • Employed a 97-actuator deformable mirror for pre-compensation of the laser upwards propagation path.
  • Integrated and tested the UWCS on the Optical Ground Station telescope at Teide Observatory.

    • Main Results:

    • Successfully demonstrated uplink correction using AO techniques.
    • Validated the UWCS design and integration process.
    • Assessed beam power concentration as a measure of correction effectiveness.

    Conclusions:

    • The UWCS is a viable pathfinder instrument for uplink AO correction.
    • The technology shows direct applicability to Free-Space Optical Communications and Laser Guide Star generation.
    • The system's performance was successfully evaluated at a ground-based observatory.