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Instrument Calibration

Instrument Calibration

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...

Glassware Calibration

Glassware Calibration

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...

Calibration Curves: Linear Least Squares

Calibration Curves: Linear Least Squares

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: Jul 6, 2026

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Unified calibration technique and its applications in optical triangular profilometry.

A Asundi¹, Z Wensen

¹School of Mechanical and Production Engineering, Nanyang Technological University, Singapore.

|March 6, 2008

Summary

A new ray tracing calibration method for optical triangular profilometry offers fast, accurate 3D measurements. This technique minimizes errors from lens distortion without needing geometric parameter determination.

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Area of Science:

Optics and Photonics
Computer Vision
Metrology

Background:

Optical triangular profilometry is a key 3D measurement technique.
Calibration is crucial for accuracy but can be complex and prone to errors.
Lens distortion in projectors and cameras often complicates calibration.

Purpose of the Study:

To present a unified calibration technique for optical triangular profilometry.
To develop a method that is fast, accurate, and reduces calibration errors.
To demonstrate the technique's applicability across different profilometry systems.

Main Methods:

A unified calibration technique based on ray tracing.
Leveraging the geometric relationship between depth and distorted signals.
Assuming local linear transformations to model lens distortion.

Main Results:

Achieved speedy and accurate 3D measurements.
Eliminated the need for determining explicit geometric parameters.
Reduced calibration errors caused by lens distortion.

Conclusions:

The proposed ray tracing calibration technique is effective for optical triangular profilometry.
The method simplifies calibration and improves measurement accuracy.
Demonstrated successful application on spot inspection, single-line, and projection-grating systems.