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Related Concept Videos

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

81
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...
81

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Self-Mixing Laser Distance-Sensor Enhanced by Multiple Modulation Waveforms.

Federico Cavedo1, Parisa Esmaili1, Michele Norgia1

  • 1Department of Electronics, Information and Bioengineering, Politecnico di Milano, 20133 Milan, Italy.

Sensors (Basel, Switzerland)
|November 11, 2022
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Summary
This summary is machine-generated.

This study presents a reliable laser distance sensor using wavelength modulation for improved accuracy. The novel approach enhances measurement reliability and overcomes signal fading for practical applications.

Keywords:
distance measurementlaser sensorsoptical rangefinderself-mixing interferometry

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Area of Science:

  • Optical Metrology
  • Laser Sensing Technologies

Background:

  • Self-Mixing Interferometry (SMI) based optical rangefinders are well-documented but lack commercial viability due to reliability challenges.
  • Developing robust SMI instruments is difficult, hindering market entry despite numerous proposed signal processing techniques.

Purpose of the Study:

  • To develop a reliable laser distance sensor overcoming the limitations of current Self-Mixing Interferometry techniques.
  • To enhance measurement accuracy and robustness for practical, real-world applications.

Main Methods:

  • Implemented a laser distance sensor utilizing wavelength modulation at a distinct frequency to decorrelate errors.
  • Developed dedicated software for automatic modulation pre-emphasis to linearize wavelength modulation.
  • Employed data selection algorithms to mitigate signal fading caused by the speckle effect.

Main Results:

  • Achieved approximately 0.1 mm accuracy for distance measurements up to 2 meters.
  • Demonstrated a measurement rate of 200 samples per second with the developed prototype.
  • Successfully overcame signal fading issues through advanced data processing algorithms.

Conclusions:

  • The proposed laser distance sensor with modulated wavelength and advanced algorithms offers improved reliability and accuracy.
  • This approach addresses key challenges in Self-Mixing Interferometry, paving the way for commercialization.
  • The prototype validates the effectiveness of the techniques for practical optical rangefinding.