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Related Concept Videos

Framing Effects03:26

Framing Effects

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Information is everywhere and its presentation—such as how and when items are presented—can impact our perceptions and decisions surrounding the info. This broad concept umbrellas framing effects—influences that occur due to the way information is framed in its appearance, whether it’s purely the order or the specific wording of a message. Let’s take a look at numerous ways in which two versions of something can objectively say the same thing, yet we respond in...
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Frames01:30

Frames

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Frames are essential components of various mechanical and structural systems used daily. These structures are known for their stability and ability to bear heavy loads. A frame is constructed using two-force and multi-force members, interconnected using pin joints. In contrast, trusses are made entirely of two-force members.
Frames are versatile and widely used in various applications such as structural supports for beams and columns, automobile chassis construction, and in the construction...
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Frames: Problem Solving II01:26

Frames: Problem Solving II

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Consider a hydraulic hoist supporting a load of 1 kN. Assuming a simplified schematic representation of this frame structure, the force acting on BD and BF members can be determined.
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Frames: Problem Solving I01:24

Frames: Problem Solving I

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Consider a jib crane with an external load suspended from the pulley. The dimensions of the crane members are shown in the figure. A systematic analysis of the frame structure is required to determine the reaction forces at the pin joints, assuming that the pulleys are frictionless.
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Inertial Frames of Reference01:03

Inertial Frames of Reference

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Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
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Non-inertial Frames of Reference01:27

Non-inertial Frames of Reference

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A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
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Related Experiment Video

Updated: Feb 6, 2026

Fluorescence Lifetime Macro Imager for Biomedical Applications
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Single-shot time-gated fluorescence lifetime imaging using three-frame images.

Yahui Li, Hui Jia, Shaorong Chen

    Optics Express
    |August 17, 2018
    PubMed
    Summary

    This study introduces a new single-shot fluorescence lifetime imaging (FLI) method for precise flow measurements. The TFI-TGFLI technique offers a wider lifetime range and accurate results, validated by simulations and experiments.

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    Area of Science:

    • Fluid dynamics
    • Optical imaging
    • Spectroscopy

    Background:

    • Accurate measurement of complex flows requires advanced imaging techniques.
    • Fast, high-precision single-shot fluorescence lifetime imaging (FLI) is crucial for such applications.

    Purpose of the Study:

    • To present a novel single-shot time-gated fluorescence lifetime imaging method using three-frame images (TFI-TGFLI).
    • To achieve a wider lifetime range (0.6–13 ns) with high precision for complex flow analysis.

    Main Methods:

    • Integration of a three-gate rapid lifetime determination (RLD) scheme with a four-channel framing camera.
    • Validation through Monte Carlo simulations and experimental diagnosis of toluene-seeded gas mixing jets.

    Main Results:

    • The TFI-TGFLI method demonstrated a wider lifetime range compared to previous two-gate RLD schemes.
    • Experimental results for gas mixing jets showed good agreement with streak camera measurements (e.g., 7.6 ns and 2.6 ns average lifetimes).
    • Analysis of quencher and fluorescent species concentrations aligned with experimental conditions.

    Conclusions:

    • The TFI-TGFLI method is a viable and precise tool for qualitative and quantitative measurements in complex flows.
    • This technique advances FLI capabilities for dynamic flow characterization.