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Related Concept Videos

Uncertainty in Measurement: Reading Instruments02:46

Uncertainty in Measurement: Reading Instruments

Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
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Measuring the Behavioral Effects of Intraocular Scatter
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Published on: February 18, 2021

Instrument comparison: corrected stellar scintillometer versus isoplanometer.

J Krause-Polstorff, E A Murphy, D L Walters

    Applied Optics
    |September 11, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Correcting the stellar scintillometer (an instrument measuring atmospheric refractive turbulence) significantly improves its agreement with the isoplanometer. This advancement enhances atmospheric turbulence measurements for optical applications.

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    Area of Science:

    • Astronomy and Astrophysics
    • Atmospheric Science
    • Optical Engineering

    Background:

    • Atmospheric refractive turbulence affects optical systems by distorting light propagation.
    • The isoplanometer and stellar scintillometer are instruments used to measure atmospheric turbulence parameters like the isoplanatic angle.
    • Previous theoretical treatments of the National Oceanic and Atmospheric Administration's stellar scintillometer were noted as incomplete.

    Purpose of the Study:

    • To correct the theoretical treatment and implementation of the stellar scintillometer for spectral effects and finite aperture.
    • To compare the performance of the corrected stellar scintillometer with the isoplanometer in measuring the isoplanatic angle.
    • To validate the improved accuracy of the stellar scintillometer under diverse meteorological conditions.

    Main Methods:

    • Conducted simultaneous measurements using an isoplanometer and a stellar scintillometer during an electro-optical/meteorological experiment.
    • Applied theoretical corrections for spectral effects and finite aperture to the stellar scintillometer data.
    • Utilized an atmospheric drop-off model to extrapolate scintillometer measurements to higher altitudes.

    Main Results:

    • Agreement between the isoplanometer and the stellar scintillometer significantly improved after applying corrections to the scintillometer data.
    • The corrected stellar scintillometer measurements showed relative percent departures within 10% of the isoplanometer's isoplanatic angle values.
    • Uncorrected stellar scintillometer data exhibited departures ranging from 16% to 24%, highlighting the importance of the corrections.

    Conclusions:

    • The corrected stellar scintillometer provides a more accurate measurement of atmospheric refractive turbulence and the isoplanatic angle.
    • The findings validate the enhanced theoretical framework for the stellar scintillometer, improving its utility in atmospheric studies.
    • Accurate measurement of atmospheric turbulence is crucial for adaptive optics and other astronomical and remote sensing applications.