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Related Concept Videos

Distance Corrections01:15

Distance Corrections

To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
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Updated: May 14, 2026

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Methods for Improving the Straightness Accuracy of Laser Fiber-Based Collimation Measurement.

Ying Zhang1, Peizhi Jia2, Qibo Feng1

  • 1Key Laboratory of Luminescence and Optical Information, School of Physical Science and Engineering, Beijing Jiaotong University, Beijing 100044, China.

Sensors (Basel, Switzerland)
|May 13, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces advanced calibration and digital compensation methods to enhance laser fiber-based straightness measurements. These techniques address nonlinear detector responses and air turbulence, significantly improving accuracy and stability for machine tool applications.

Keywords:
air turbulencebeam drift compensationlaser collimationquadrant detectorstraightness measurement

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Area of Science:

  • Optoelectronics
  • Metrology
  • Precision Engineering

Background:

  • Laser fiber-based collimation offers precise straightness measurement but faces challenges.
  • Nonlinear detector response and air turbulence degrade performance, especially in long-distance applications.

Purpose of the Study:

  • To develop and validate novel methods for improving the accuracy and stability of laser fiber-based straightness measurements.
  • To address nonlinearities in four-quadrant detectors and environmental disturbances like air turbulence.

Main Methods:

  • Implemented a two-dimensional planar calibration method with polynomial surface fitting to correct detector nonlinearities and inter-axis coupling.
  • Developed a real-time digital compensation method for beam drift in long-distance single-pass common-path measurements.
  • Conducted comparative experiments and theoretical simulations analyzing optical configurations and air turbulence effects.

Main Results:

  • The 2D planar calibration significantly reduced calibration residuals and improved measurement accuracy.
  • The double-pass common-path configuration showed more temporal drift compared to single-pass.
  • The proposed real-time digital compensation effectively suppressed environmental air turbulence-induced drift.

Conclusions:

  • The developed methods enhance the reliability and precision of laser fiber-based straightness measurements.
  • The study provides solutions for critical issues in high-precision metrology for machine tools and other applications.
  • Accurate and stable long-travel geometric error measurement is achievable with the proposed techniques.