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Related Concept Videos

Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next sampling...
Sound Waves: Interference00:53

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
Atomic Absorption Spectroscopy: Interference01:25

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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Interference fringe signal generator and its application.

T Ohishi1

  • 1National Research Laboratory of Metrology, Itabashi-ku, Tokyo, Japan.

The Review of Scientific Instruments
|May 1, 1978
PubMed
Summary
This summary is machine-generated.

A novel fringe signal generator was developed to assess fringe shift measuring systems. This device provides accurate quadrature fringe signals, enabling precise nonlinearity testing for improved optical metrology.

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Area of Science:

  • Optical Metrology
  • Instrumentation Engineering

Background:

  • Fringe shift measuring systems are crucial for precise optical measurements.
  • Evaluating the performance and nonlinearity of these systems is essential for accuracy.
  • Existing methods for performance testing may have limitations in accuracy or response.

Purpose of the Study:

  • To develop and present a novel fringe signal generator.
  • To provide a tool for checking the performance of fringe shift measuring systems.
  • To enable accurate testing of system nonlinearity.

Main Methods:

  • Devised a fringe signal generator producing a pair of fringe signals.
  • Ensured signals are in phase quadrature, driven by an electric input.
  • Characterized the generator's output accuracy and response speed.

Main Results:

  • The generator achieves high accuracy, around 0.01 fringe over a 2.5 fringe range.
  • Demonstrated a fast response time of up to 1 fringe per 60 microseconds.
  • Successfully used the generator to test the nonlinearity of a fringe shift measuring system.

Conclusions:

  • The developed fringe signal generator is effective for performance evaluation.
  • The device offers high accuracy and rapid response for metrology applications.
  • This tool facilitates the assessment and improvement of fringe shift measurement systems.