Recent Measurement Posts

Thermal expansion uncertainty

Thermal expansion is a very important source of uncertainty for many dimensional measurements. Measurements are often corrected for thermal expansion ...
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Method for traceable coordinate measurements

I've worked a lot with large-scale coordinate measurements in aircraft and spacecraft assembly. These measurements are typically not fully traceable and ...
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Calibration of a large scale 3D attitude sensor

Researchers at Tianjin University have developed an attitude sensor, located within the reflector target for a total station. This enables large ...
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Methods for thermally compensated measurements of large structures

Thermal deformations are often the dominant source of uncertainty for high accuracy measurements of large structures. This open access paper published in ...
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Gas turbine engine showing position of tooling used for product verification

Uncertainty of Product Verification study with Rolls-Royce

This open access paper shows how easily misunderstood uncertainty of product verification can be. This comes from our ground breaking ...
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Accuracy of Photogrammetry for two systems compared to a laser tracker

Study of the Accuracy of Photogrammetry systems published in The Photogrammetric Record

Title: Comparative Performance between Two Photogrammetric Systems and a Reference Laser Tracker Network for Large-Volume Industrial Measurement This study compared ...
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Axi-symmetric measurement machine

Uncertainty Evaluation Method for Axi-Symmetric Measurement Machines published in Int J of Metrology & Quality Eng.

Title: Uncertainty Evaluation Method for Axi-Symmetric Measurement Machines Axi-Symmetric Measurement Machines measure roundness, axial runout and coning. A complete uncertainty evaluation procedure ...
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RPI-Uncertainty-paper-featured-image

Uncertainty of Runout Measurement – paper presented in Taiwan

Title: Uncertainty of the Measurement of Radial Runout, Axial Runout and Coning using an Industrial Axi-Symmetric Measurement Machine Authors: J ...
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Large Volume Metrology Technologies at DET 2014

This paper presents the vision for how the technologies of the Light Controlled Factory will enable Part-to-part assembly, Low cost ...
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FEA Model of a Wing Cover Handling Frame

Thermal compensation

LIMA is now a partner on the European LUMINAR project. The aim of this project is to tackle several fundamental ...
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First we Align the ‘Groma’ with the Fixed Reference Point

Make a simple Groma!

The Groma was the simple surveying tool used in Babylonia, Ancient Greece, Ancient Rome and Medieval Europe. It was constructed ...
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iGPS Tests

Verification of the Indoor GPS System, by Comparison with Calibrated Coordinates and by Angular Reference

This paper details work carried out to verify the dimensional measurement performance of the Indoor GPS (iGPS) system; a network of ...
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Review of Large Volume Metrology for Airbus NGCW

Introduction The Next Generation Composite Wing (NGCW) project is a £100M initiative led by Airbus to revolutionize aircraft wings in order to ...
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Estimation of Uncertainty in Three Dimensional Coordinate Measurement by Comparison with Calibrated Points

This paper details a method of estimating the uncertainty of dimensional measurement for a three dimensional coordinate measurement machine. An ...
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Measurability Characteristics Mapping for Large Volume Metrology Instruments Selection

Measurement and verification of products and processes during the early design is attracting increasing interest from high value manufacturing industries ...
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Measurement Verification

There is a need within industry for independent and technically rigorous capability assessment of instruments. An important aspect of this ...
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Large Volume Metrology Instrument Selection and Measurability Analysis

A wide range of metrology processes are involved in the manufacture of large products. In addition to the traditional tool ...
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iGPS Tests

Verification Of The Indoor Gps System By Comparison With Points Calibrated Using A Network Of Laser Tracker Measurements

This paper details a method of determining the uncertainty of dimensional measurement for a three dimensional coordinate measurement machine. An ...
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