Manufacturing Technology Today

B. Hari Prasad ¹

Affiliations
1 Advanced Metrology Division, Defence Research & Development Laboratory, Hyderabad, IN

Abstract

Metrology is the science of measurement derived from the Greek word metro-logy, which includes all aspects of both theoretical and practical reference to measurements, their uncertainty and in whatever fields of science or technology they occur. One of the most illustrious scientists of the 19th century, Lord Kelvin, once remarked in a lecture "Knowledge about anything is complete only when it can be measured and expressed in numbers. When you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind ".

Full Text

     

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.

Full Text