The UHR Fourier Domain OCT instrument is based on a super continuum broad band laser source, coupled with a fibre coupler-based Michaelson interferometer and CCD detector-based spectrometer. The system operates at a central wavelength of 810 nm with a 200 nm spectral bandwidth, producing an axial (depth) resolution of 1.8 µm (1.2 µm in paint assuming refractive index n=1.5 for polymers). Rapid collection of 3D OCT data sets are constructed by scanning the laser spot using a pair of galvometer scanning mirrors. The OCT probe has a working distance of 65 mm. The maximum transverse resolution of the system at the probe's focus is 7 µm. The maximum field of view is 10 mm x 10 mm. In a typical scan, an image cube of 1000 x 1000 depth profile can be collected in ~30s. The laser intensity at the object surface is restricted to ~1 mW to enable non-invasive probing of an object's stratigraphy. The small OCT probe can be mounted on a motorised XYZ translation stage to allow for the collection of adjacent OCT 3D cubes over a larger area of 30cm x 30cm.

Dataset/2D
Dataset/3D

Noncontact (no physical contact)
Nondestructive (no permanent damage or alteration)
Noninvasive (no physical alteration)

ISAAC in-house developed instrument

1 x 1 cm