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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Sensor for distance measurement using pixel grey-level information.

José L Lázaro1, Angel E Cano, Pedro R Fernández

  • 1Electronics Department, University of Alcalá, Polytechnic School, University Campus, Alcalá de Henares, Madrid 28871, Spain.

Sensors (Basel, Switzerland)
|February 1, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a new radiometric imaging method for distance measurement using infrared emitting diodes (IREDs). The technique analyzes light intensity to accurately estimate distances between 200 and 600 cm.

Keywords:
calibrationcamerasdistance measurementinfrared image sensorsinfrared measurementsradiometry

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Area of Science:

  • Optics and Photonics
  • Computer Vision
  • Metrology

Background:

  • Traditional distance measurement techniques can be limited in certain applications.
  • Radiometric principles offer an alternative approach to image-based sensing.

Purpose of the Study:

  • To develop and validate a novel distance measurement method using infrared emitting diodes (IREDs).
  • To explore the relationship between image grey-level intensities and distance based on radiometric principles.

Main Methods:

  • Utilized an infrared emitting diode (IRED) as the light source.
  • Employed a radiometric approach analyzing camera grey-level intensities and accumulated image irradiance.
  • Developed and calibrated a differential model based on the inverse square law.
  • Tested the model for distance estimation within a 200 to 600 cm range.

Main Results:

  • Demonstrated that camera grey-level intensities are inversely proportional to the square of the distance to the IRED.
  • Successfully calibrated a differential model for accurate distance estimation.
  • Achieved reliable distance measurements in the specified range with aligned camera and emitter.

Conclusions:

  • The proposed radiometric imaging method provides a viable alternative for distance measurement.
  • The inverse square law relationship between irradiance and distance is effectively utilized.
  • Further development could extend the applicability and range of this technique.