Sensing system for pipe inner-wall inspection by laser-beam scanning

Shigeki Ogawa, Mamoru Mizunuma, Hiroki Kuwano

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We have developed a displacement measuring technique for detailed noncontact mapping of the interior geometry of pipes. The technique, which is based on optical measurement by triangulation, uses a laser-beam scanner to measure radial displacement. A prototype system features radial-section, axial-section, and three-dimensional rendering of the inspected pipe interior, high accuracy 1 mm for a 20-60 mm radius, non-contact measurement, and front video images provided by a CCD camera. This paper describes the pipe-measurement system, including the measuring method, signal processing, data transmission, automated data-acquisition, and 3D rendering of the interior.

Original languageEnglish
Pages (from-to)923-932
Number of pages10
JournalNTT R and D
Issue number7
Publication statusPublished - 1993 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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