Dissertations and Theses @ UNI


Open Access Dissertation


Measuring instruments--Reliability; Scanning systems--Reliability;


Digitizers and scanners have begun to replace traditional devices for measuring three dimensional objects. However, there is a shortage of relevant research to compare digitizer tools with other measuring devices. The objective of this study was to compare the measurement reliability of a sonic digitizer to a traditional measuring tool, the tape measure, for measuring a complex, three-dimensional object. It was hypothesized that:

  1. H1 Data from measurements with the digitizer vary less than data from measurements with a tape measure at the 0.05 level of significance.
  2. H2 The data from eight complex surface measurements taken with a digitizer vary less than data from a tape measure at the 0.05 level of significance.

Locations on a complex three-dimensional object which replicated a human body (a half-size dress form) were selected for measurement. Measurements were made by individuals who had experience in measuring the human body with a tape measure.

The digitizer was a more reliable (i.e. showed less variability) measurement tool than a tape measure for five measurement locations on the complex object, especially for the object's poorly-defined areas. Measurement data from one location with body landmarks (center front) had less variability with the tape measure than with the digitizer tool.

The measurements with the two tools did not show overall differences in mean values (tool x location) when examined with a two-way analysis of variance. However, when using the Levene's ANOVA Transformation, variances of location and tool by location effects were significant. Based on the statistical analysis, both hypotheses were supported by the results and were accepted.

Year of Submission


Degree Name

Doctor of Industrial Technology


Department of Industrial Technology

First Advisor

Charles D. Johnson, Advisor

Second Advisor

Ali E. Kashef, Co-Advisor

Date Original


Object Description

1 PDF file (vi, 92 pages)



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