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Related Concept Videos

Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

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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Reflective surfaces for panoramic imaging.

J S Chahl, M V Srinivasan

    Applied Optics
    |February 12, 2008
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed novel reflective surfaces for cameras to capture panoramic environmental views. These surfaces enable wide-angle imaging beyond 180 degrees, avoiding distortions common in traditional lenses.

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    Area of Science:

    • Optics
    • Computer Vision
    • Surface Engineering

    Background:

    • Conventional wide-angle imaging devices often suffer from distortions and aberrations.
    • Capturing a global view of the visual environment with a single camera is challenging.

    Purpose of the Study:

    • To present a family of reflective surfaces capable of capturing a global view.
    • To enable wide-angle imaging exceeding 180 degrees without optical distortions.

    Main Methods:

    • Derived a family of reflective surfaces by solving a differential equation relating camera viewing angle to the angle of incidence.
    • Analyzed the relationship between the angle of incidence and reflection on the derived surfaces.

    Main Results:

    • The novel reflective surfaces provide fields of view greater than 180 degrees.
    • These surfaces maintain a linear relationship between incidence and reflection angles, similar to a mirror.
    • The gradient of this linear relationship can be adjusted to control the field of view.

    Conclusions:

    • The developed reflective surfaces offer a distortion-free method for wide-angle imaging.
    • These surfaces have significant potential applications in surveillance and machine vision systems.