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Adjusting a Traverse01:12

Adjusting a Traverse

In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Range-finding by triangulation with nondiffracting beams.

J A Davis, E Carcole, D M Cottrell

    Applied Optics
    |November 19, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new method for distance measurement using nondiffracting beams. By creating intersecting Bessel beams, precise measurements can be achieved with controllable distances.

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    Area of Science:

    • Optics
    • Optical Metrology

    Background:

    • Nondiffracting beams, such as Bessel beams, maintain their size during propagation, making them suitable for alignment tasks.
    • Accurate distance measurement is crucial in various scientific and industrial applications.

    Purpose of the Study:

    • To develop a novel technique for distance measurements utilizing nondiffracting beams.
    • To demonstrate the generation and application of intersecting Bessel beams for metrology.

    Main Methods:

    • Designing a diffractive optical element to generate two off-axis, tilted, nondiffracting Bessel function beams.
    • Utilizing a programmable spatial light modulator to control the Bessel beam generation.
    • Inducing interference between the two Bessel beams at a specific intersection point.

    Main Results:

    • Successfully generated two tilted, nondiffracting Bessel beams.
    • Achieved interference between the beams at a controlled distance from the input plane.
    • Demonstrated the capability for distance measurements based on the interference pattern.

    Conclusions:

    • The proposed technique enables precise distance measurements using nondiffracting Bessel beams.
    • Programmable control over the intersection distance offers flexibility in measurement applications.
    • This method has potential applications in alignment and metrology where non-contact distance sensing is required.