Informatics Publishing Limited

Kushal Singh ¹, Manish Kumar ¹, Ashok Ponram ¹, Hari Prasad ¹, Arjun Vedadri ¹

Affiliations
1 Defence Research & Development Laboratory, Hyderabad, IN

Abstract

There are a variety of technologies for digitally acquiring the shape of a 3D object. Broadly it can be classified in two categories i.e. contact and non-contact. The Laser technology which falls under non contact type active scanning technique uses Time-of-flight or triangulation 3D laser scanner to probe the object. In Laser Scanning data is collected by a computer and recorded as data points within three-dimensional space, with processing this con be converted into a triangulated mesh and then a Computer-aided design model, often as Nonuniform rational B-spline surfaces. This paper presents the evolved measurement methodologies with the help of CMM, Portable Laser Scanner and other conventional measurement instruments to generate 3D CAD models & engineering drawings and evaluate the critical parameters for missile subsystems.

Keywords

Laser Scanning, CAD Model, Digitization, Metrology.

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K. Bala Murugan ¹, Manish Kumar ¹, B. Ashok ¹, B. Hari Prasad ¹, Arjun Vedadri ¹

Affiliations
1 Defence Research & Development Laboratory, Hyderabad, IN

Abstract

According to international standards, measurement uncertainties have to be stated with all measurements and any measurement result is meaningless without a quantitative statement of uncertainty. Measurement uncertainty is characterized by the dispersion of values that could be attributed to the result of measurement. The dispersion of measurement result is obtained from the dispersion of various quantities influencing the measurement. The suitable information about the parameters which influence the measurement is described by probability density functions. This paper describes a method for evaluation of measurement uncertainty of high precision length measuring equipment by considering various factors associated with the measurement process.

Keywords

Uncertainty, Calibration, Accuracy.

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