Surface topography is very important for many applications. Today the most used techniques on artworks and stone artifacts
require long acquisition times and invasive interventions. For this reason, here a non-contact device improved in portability
is described. It can acquire wide areas in short times, so it is suitable for topography reconstruction with spatial resolution
of some tens of micrometers.
The starting point is a commercial conoscopic probe, the Optimet Conoline, that is able to reconstruct the depth profile
of a surface line probed by a built-in laser. Its accuracy and acquisition speed are as high as to return wide measured areas
in short times; its resolution permits fine details reproduction. Low interference with the artwork, high portability and low
response to environmental noise are the ingredients for the instrumental setup.
This work is intended to show the results of a few architectural and archaeological surveys realized by means of a 3D scanning device, based on TOF (Time-Of-Flight) technology. The instrument was set up by the Art Diagnostic Group of the National Institute for Applied Optics (INOA) and it is composed by a high precision scanning system equipped with a commercial low-cost distance-meter. This device was projected in order to provide the following characteristics: reliability, good accuracy and compatibility with other systems and it is devoted to applications in Cultural Heritage field.
The realization of an accurate 3D model of a building, a piece of architecture or a terrain has been a prerogative of the photogrammetric systems for a long time. However, recent developments in opto-electronic technology and 3D analysis software made the production of 3D models by laser scanning a practical proposition. The main advantages of laser scanners are accuracy and speed, allowing, thus, the collecting of data on a dense sampling of the object. For many architectural and industrial applications it is important to integrate the data acquired with different instruments, but a problem met with many commercial systems is the lack of compatibility with classic survey methodologies. Moreover, superimposition of results from different techniques is possible only if the output is metrically correct. This work is aimed at showing the results of some architectural and archaeological surveys realized by means of a 3D scanning device, based on the Time-Of-Flight (TOF) technology. The instrument, devoted to architectural applications in the Cultural Heritage field, was set up in order to provide the characteristics of reliability and compatibility to other systems. Such a device is composed by a high precision scanning system equipped with a commercial low-cost distance-meter.