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Related Concept Videos

Instrument Calibration01:12

Instrument Calibration

267
Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
An analytical balance measures mass and requires regular calibration to...
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Calibration Curves: Linear Least Squares01:20

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A calibration curve is a plot of the instrument's response against a series of known concentrations of a substance. This curve is used to set the instrument response levels, using the substance and its concentrations as standards. Alternatively, or additionally, an equation is fitted to the calibration curve plot and subsequently used to calculate the unknown concentrations of other samples reliably.
For data that follow a straight line, the standard method for fitting is the linear...
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Related Experiment Video

Updated: Sep 11, 2025

Stereo-Imaging System DLT Calibration to Capture 3D In Situ Displacements of Stretched Peripheral Nerves
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Enhanced Calibration Method for Robotic Flexible 3D Scanning System.

Zhilong Zhou1, Jinyong Shangguan1, Xuemei Sun1

  • 1College of Mechanical and Vehicle Engineering, Linyi University, Linyi 276012, China.

Sensors (Basel, Switzerland)
|August 14, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces an advanced calibration method for robot-mounted 3D scanners, significantly improving measurement accuracy for large components in advanced manufacturing. The new technique reduces maximum measurement errors by over 50%.

Keywords:
error correctiongeometric constraintshand-eye calibrationkinematic parameter calibrationrobotic 3D scanning system

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Area of Science:

  • Advanced manufacturing
  • Metrology
  • Robotics

Background:

  • High-precision quality control for large components requires efficient 3D measurement.
  • Existing methods struggle with accuracy for complex, large-scale objects.

Purpose of the Study:

  • To develop an enhanced calibration method for a robot-mounted fringe-projection 3D scanner.
  • To improve the accuracy of three-dimensional (3D) measurement for large components with local features.

Main Methods:

  • Developed a flexible measurement system integrating a fringe-projection 3D scanner and an industrial robot.
  • Proposed a multidimensional ball-based calibrator for simultaneous hand-eye and robot kinematic calibration.
  • Introduced a preliminary hand-eye calibration using geometric constraints and a virtual single point.
  • Implemented a distance-constrained calibration method to jointly estimate parameters via a distance error model.

Main Results:

  • Reduced maximum measurement error from 1.053 mm to 0.421 mm.
  • Reduced average measurement error from 0.814 mm to 0.373 mm.
  • Demonstrated significant improvement in measurement accuracy for large surfaces.

Conclusions:

  • The enhanced calibration method effectively improves the accuracy of robot-based 3D measurement systems.
  • The proposed technique is crucial for high-precision quality control in advanced manufacturing.
  • Simultaneous calibration of hand-eye transformation and robot kinematics enhances overall measurement precision.