1.1 The objective of this practice is to establish a benchmark for computer-vision-based laser pipe-profiling systems. A normalized metric is proposed. The metric takes into account the mechanical operating mode of a laser profiler and a normalized scan area geometry to result in a scalar value that represents the number of range acquisition samples or dots per square inch (dpsi) that are acquired on the interior of an idealized pipe. With this normalizing unit, laser pipe-profiling units can be benchmarked and compared against each other in a very uniform and practical manner. 1.2 Units-The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Currently, with no standard performance metric in use to benchmark computer-vision-based laser pipe-profiling systems, it is not possible to compare them objectively as data-acquisition systems. Dots per square inch (dpsi) is a unit of measure for scan density, which describes the number of measurement samples that are taken by the profiler within a 1-in. square patch on the interior of a cylindrical pipe. The establishment of the scan density performance metric for computer-vision-based laser pipe-profiling systems will not only allow for objective comparisons between different technologies on the market, but will allow for the possibility of standards to be established while promoting industry competition and growth.
computer-vision-based laser pipe-profiling system; pipe; pipe profiling system; rotational profiler system
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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