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Related Concept Videos

Control Systems: Applications01:25

Control Systems: Applications

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Electrical engineering plays a pivotal role in our daily lives, with control systems at the heart of many applications, from home appliances to sophisticated space shuttles. Control systems manage and regulate the behavior of devices and processes, ensuring they function safely, correctly, and efficiently.
In modern vehicles, control systems manage various functions to enhance performance and safety. The steering wheel and accelerator are primary inputs in a car's control system. The...
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Wedges01:24

Wedges

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A wedge is a simple machine that serves various purposes, such as adjusting the elevation of structural or mechanical parts, providing stability for heavy objects, and splitting a body into two parts. This versatile tool can amplify an applied force, making it easier to manipulate large or heavy objects.
Consider using a wedge to lift a heavy slab. Here, the wedge functions by converting the applied force into a much larger force directed almost perpendicular to the initial force. This...
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Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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Thermal Strain01:19

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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Fixing Double-strand Breaks02:04

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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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Thermal Expansion01:22

Thermal Expansion

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The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
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Related Experiment Video

Updated: Feb 6, 2026

Multi-layer Cortical Ca2+ Imaging in Freely Moving Mice with Prism Probes and Miniaturized Fluorescence Microscopy
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Double-wedge prism scanner for application in thermal imaging systems.

Shian-Fu Lai, Cheng-Chung Lee

    Applied Optics
    |August 18, 2018
    PubMed
    Summary

    Double-wedge prisms, or Risley prisms, offer compact and robust scanning solutions. This study overcomes their non-linear scanning issues, enabling their use in imaging systems.

    Area of Science:

    • Optical Engineering
    • Mechanical Systems
    • Imaging Technology

    Background:

    • Double-wedge prisms (Risley prisms) offer compact, robust scanning but have non-linear angular relationships and non-rectilinear scan patterns.
    • These limitations have historically restricted their application in one-dimensional scanning for imaging systems.

    Purpose of the Study:

    • To analyze the optical characteristics of double-wedge prisms.
    • To develop methods for overcoming the non-linear scanning and non-rectilinear trajectory issues.
    • To demonstrate the feasibility of using double-wedge prisms as one-dimensional scanners in imaging systems.

    Main Methods:

    • Investigated four assembly configurations of double-wedge prisms.
    • Characterized the optical properties, focusing on angular deviation and scan pattern.

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  • Developed and applied novel methods to address non-linearity and trajectory deviations.

    • Main Results:

    • The study details the optical characteristics of double-wedge prisms in various configurations.
    • Methods were proposed and validated to linearize the angular relationship and correct scan trajectories.
    • Experimental results confirmed the successful application of double-wedge prisms as one-dimensional scanners.

    Conclusions:

    • Double-wedge prisms, despite previous limitations, can be effectively employed as one-dimensional scanners in imaging systems.
    • The proposed methods successfully mitigate non-linear scanning and non-rectilinear trajectory issues.
    • This advancement opens new possibilities for compact and robust scanning solutions in optical imaging.