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Related Concept Videos

Glassware Calibration01:11

Glassware Calibration

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Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
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In a linear calibration curve, there is a value called the calibration coefficient, denoted by 'r,' which measures the strength and the direction of association between two variables. The correlation coefficient value ranges from −1 to +1. A value of +1 indicates a perfect positive linear correlation, −1 denotes a perfect negative correlation, and 0 implies no correlation between the two variables. A positive correlation value establishes that as one variable increases, the...
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Related Experiment Video

Updated: Sep 22, 2025

Corneal Confocal Microscopy: A Novel Non-invasive Technique to Quantify Small Fibre Pathology in Peripheral Neuropathies
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Calibration Alignment Sensitivity in Corneal Terahertz Imaging.

Faezeh Zarrinkhat1,2, Mariangela Baggio2, Joel Lamberg2

  • 1CommSensLab, Technical University of Catalonia/UPC, 08034 Barcelona, Spain.

Sensors (Basel, Switzerland)
|May 20, 2022
PubMed
Summary
This summary is machine-generated.

Calibrating corneal terahertz sensing with a steel sphere improves early diagnosis of corneal dystrophies. Perturbations in calibration significantly increase diagnostic errors, highlighting the need for precise methods.

Keywords:
corneaparticle-swarm optimizationterahertz

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Area of Science:

  • Biomedical Optics
  • Terahertz Spectroscopy
  • Corneal Imaging

Background:

  • Corneal terahertz sensing is vital for diagnosing corneal dystrophies.
  • Improving longitudinal modes coupling enhances sensing resolution.
  • Calibration methods are crucial for accurate corneal property assessment.

Purpose of the Study:

  • To investigate the impact of calibration sphere perturbations on corneal terahertz sensing.
  • To quantify corneal characteristics using particle-swarm optimization under varying calibration scenarios.
  • To determine optimal frequency bands for corneal feature assessment.

Main Methods:

  • Utilized a steel sphere for calibrating corneal reflection measurements.
  • Employed particle-swarm optimization to quantify corneal properties.
  • Analyzed data across a frequency range of 100 GHz to 600 GHz and different signal-to-noise ratios (SNRs).
  • Evaluated the effect of calibration sphere perturbations on estimation accuracy.

Main Results:

  • Higher SNRs (40-60 dB) led to improved corneal property estimation.
  • The WR-5.1 waveguide band (lower frequency) is most suitable for corneal feature assessment.
  • Perturbations in the calibration sphere increased estimation errors by approximately 30% at 60 dB SNR.

Conclusions:

  • Accurate calibration is essential for reliable corneal terahertz sensing.
  • Perturbations in the calibration sphere significantly compromise diagnostic accuracy.
  • The study provides insights into optimizing terahertz sensing for early corneal dystrophy detection.