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Related Concept Videos

Echo01:06

Echo

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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
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Reflection of Waves01:07

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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

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During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance.
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Total Internal Reflection Fluorescence Microscopy01:05

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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Measuring corner cube reflectors through ray tracing of a reflected wavefront.

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    This study introduces a new method to measure corner cube errors using wavefront reflection, simplifying optical system calibration. The technique accurately determines right-angle plane deviation, enhancing optical component reliability.

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    Area of Science:

    • Optics and Optical Engineering
    • Metrology

    Background:

    • Corner cubes are critical components in advanced optical systems.
    • Dihedral deviation errors in corner cubes can cause unacceptable system performance.

    Purpose of the Study:

    • To present a novel method for measuring the right-angle plane deviation of corner cubes.
    • To enable accurate assessment of corner cube errors without complex traditional methods.

    Main Methods:

    • Measuring the normal incident reflection wavefront of the corner cube.
    • Employing an iterative ray tracing calculation based on the corner cube reflection process.

    Main Results:

    • Accurate determination of the three-dimensional shape of the corner cube's right-angle plane.
    • Successful identification of dihedral deviation and other errors.

    Conclusions:

    • The proposed method is easy to implement and reliable for measuring corner cube deviations.
    • This technique simplifies error measurement in optical systems and assembly processes.