The Open UniversitySkip to content
 

Distinguishing between similar tubular objects using pulse reflectometry: a study of trumpet and cornet leadpipes

Buick, J.M.; Kemp, J.; Sharp, D.B.; van Walstijn, M.; Campbell, D.M. and Smith, R.A. (2002). Distinguishing between similar tubular objects using pulse reflectometry: a study of trumpet and cornet leadpipes. Measurement Science and Technology, 13(5) pp. 750–757.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1088/0957-0233/13/5/313
Google Scholar: Look up in Google Scholar

Abstract

This paper considers the measurement of the internal radius of a number of similar, short, tubular leadpipes using pulse reflectometry. Pulse reflectometry is an acoustical technique for measuring the internal bore of a tubular object by analysing the reflections which occur when an acoustical pulse is directed into the object. The leadpipes are designed to form the initial, or lead, part of a trumpet or cornet and their internal radii differ by less than 0.1 mm between similar pipes. The ability of the reflectometer to detect these small differences, which are considered by players to produce a noticeable difference in the sound of an instrument, are investigated. It is seen that the pulse reflectometer is able to distinguish between leadpipes with different nominal radii varying by as little as 0.03 mm, demonstrating its potential in the study of musical instruments and showing that it can be used as a diagnostic tool by the instrument manufacturer to detect defects which are significant enough to acoustically alter performance. The absolute accuracy of the radius measurements is also considered at the end of the leadpipe, where the uncertainty is ±0.05 mm.

Item Type: Journal Article
ISSN: 0957-0233
Keywords: acoustic pulse reflectometry; bore profile; leadpipes
Academic Unit/Department: Mathematics, Computing and Technology > Engineering & Innovation
Item ID: 2157
Depositing User: David Sharp
Date Deposited: 06 Jun 2006
Last Modified: 02 Dec 2010 19:46
URI: http://oro.open.ac.uk/id/eprint/2157
Share this page:

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk