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Related Concept Videos

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...
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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...

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Related Experiment Video

Updated: Jun 6, 2026

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Vibration measurement by the time-averaged electronic speckle pattern interferometry methods.

W C Wang, C H Hwang, S Y Lin

    Applied Optics
    |November 25, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Electronic speckle pattern interferometry (ESPI) vibration measurement methods were compared. The amplitude-fluctuation method offers improved fringe visibility over traditional video-signal-addition techniques for enhanced vibration analysis.

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    Area of Science:

    • Optical Measurement Techniques
    • Vibration Analysis
    • Image Processing

    Background:

    • Electronic Speckle Pattern Interferometry (ESPI) is a widely used technique for vibration measurement.
    • The conventional video-signal-addition method in ESPI often yields fringe patterns with poor visibility.
    • This limits the effectiveness of direct fringe pattern analysis in vibration studies.

    Purpose of the Study:

    • To compare three distinct image-processing methods for ESPI-based vibration measurement.
    • To investigate the visibility of fringe patterns generated by different ESPI techniques.
    • To evaluate errors associated with direct zero-order Bessel function analysis in fringe patterns.

    Main Methods:

    • Comparison of video-signal-addition, video-signal-subtraction, and amplitude-fluctuation methods.
    • Application of time-averaged technique within the ESPI framework.
    • Analysis of fringe patterns for vibration measurement accuracy and visibility.

    Main Results:

    • The video-signal-addition method, while common, produces fringe patterns that are difficult to observe without further processing.
    • Two video-signal-subtraction methods were explored to enhance fringe visibility.
    • The amplitude-fluctuation method is introduced as a novel approach for improved fringe visibility.

    Conclusions:

    • The amplitude-fluctuation method and a modified video-signal-subtraction method enhance fringe visibility in ESPI vibration measurements.
    • These improved methods offer better observation of fringe patterns compared to the standard video-signal-addition technique.
    • Further investigation into Bessel function errors is recommended for robust vibration analysis.