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Related Concept Videos

Frequency-Domain Interpretation of PD Control01:24

Frequency-Domain Interpretation of PD Control

Proportional-Derivative (PD) controllers are widely used in fan control systems to improve stability and performance. A fan control system can be effectively represented using a Bode plot to illustrate the impact of a PD controller through its transfer function. The Bode plot visually conveys how PD control modifies the fan's response across various frequencies, providing a frequency domain interpretation of the controller's behavior.
The proportional control gain, combined with the system's...
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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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The conversion of state-space representation to a transfer function is a fundamental process in system analysis. It provides a method for transitioning from a time-domain description to a frequency-domain representation, which is crucial for simplifying the analysis and design of control systems.
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Using Informational Connectivity to Measure the Synchronous Emergence of fMRI Multi-voxel Information Across Time
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Disorder mapping in VCSELs using frequency-selective feedback.

T Ackemann1, N Radwell, Y Noblet

  • 1SUPA and Department of Physics, University of Strathclyde, Glasgow, UK. thorsten.ackemann@strath.ac.uk

Optics Letters
|March 27, 2012
PubMed
Summary
This summary is machine-generated.

We developed a simple, high-resolution method to map laser cavity resonance variations. This technique uses frequency-selective feedback and a passive filter, avoiding costly tunable lasers or spectrometers.

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Area of Science:

  • Optics and Photonics
  • Semiconductor Lasers

Background:

  • Broad-area lasers exhibit variations in cavity resonance due to factors like growth-induced inhomogeneities.
  • Characterizing these variations is crucial for optimizing laser performance and understanding device physics.

Purpose of the Study:

  • To present a straightforward, high spectral and spatial resolution method for mapping cavity resonance variations in broad-area lasers.
  • To demonstrate the technique's applicability using a vertical-cavity surface-emitting-laser (VCSEL).

Main Methods:

  • Employs frequency-selective feedback to probe cavity resonance.
  • Utilizes a narrow-bandwidth passive filter with a standalone laser.
  • Achieves high spectral and spatial resolution without expensive tunable lasers or spectrometers.

Main Results:

  • Successfully mapped variations in cavity resonance with high resolution.
  • Demonstrated the effectiveness of the simple method on a VCSEL.

Conclusions:

  • The developed method offers an accessible and efficient approach for characterizing laser cavity inhomogeneities.
  • This technique provides valuable insights into the performance limitations and design of broad-area lasers.