Puretronics      
 
 
 
 
 

Defect Detection System For Restoration & Preservation
of Artwork & Paintings ( IR Scanner)

 
 
Product Brief
The IR SCANNER is an infrared reflectographer. The infrared reflectography is an optical technique successfully used in the analisys of old paintings (on wood, canvas or wall, fresco excluded). The IR Reflectography allows to display artist’s scketches behind the paint layer. By this technique is also allowed to disclose presence of hidden layings previous to the final one.
 
Working Principle
 
IR REFLECTOGRAPHY is an optical technique to analyse paintings. It works in the so called Near InfraRed wavelengths (N.I.R.), that’s between around 0.8 mm and 2.5 mm. Its major use is the detection of details hidden underneath layings, among which there is the underdrawing.
 
Features
 
The IR SCANNER combines to the good visibility achieved by a Vidicon tube an excellent contrast, a more extended tone range and a very high spatial resolution, as it is briefly reported below.
 
Spatial Resolution: 4 pixel/mm (16 pixel/mm2), equal to 101.6 dpi
Tone Range:  4096 levels of gray
Working Wavelength: 900 ÷ 1700 nm
Acquisition Area:  1 m2
Dimensions of digital image: 4000 * 4000 pixel
Vertical Scan Speed ~ 0.2 m/s (this data immediately informs about the total time of acquisition: for example 6 hours for 1 m2 area)
Distance between optical head and painting: ~ 150 mm
Image Format: RAW 16 bit (for reflectograms relevant to 1 m2 area, the image dimension is ~ 32 MB)
Increment of vertical stroke by a rigid module on Y axis, to scan areas as tall as 2 m, by simply moving initial position of the optical head
Use of a standard notebook as PC;
 
The Portable Version
 
FALCON has designed and manufactured a convenient portable version of the IR SCANNER, having the following features:
modularity
lightness
ergonomic design
very fast decomposability
limited number of modules
modules portable in wheeled containers