The long wavelength Fourier Domain OCT instrument is based on a bespoke SWIR super continuum broad band laser source coupled with a free space Michaelson interferometer and sterling cooled InSb detector-based spectrometer. This enables OCT operation at a central wavelength of 1960 nm with a 220 nm spectral bandwidth, producing an axial (depth) resolution of 9µm in air (or 6µm in polymer such as paint or opaque glass) . Rapid collection of 3D OCT data sets are constructed by scanning the laser spot via a pair of galvometer scanning mirrors. Transverse resolution and the field of view is dependent on the instrument optics. For the standard configuration the transverse resolution is 17 microns over a field of view is 7 mm x 7mm with an axial imaging range of 1.7 mm and working distance of 40 mm. The system can collect an image cube consisting of 500 x 500 depth profiles in ~2 minutes. The typical laser intensity at the object surface is 1 mW. The small OCT probe can be mounted on a motorised XYZ translation stage to take adjacent image cubes to mosaic a larger area.

Dataset/2D
Dataset/3D

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

ISAAC in-house developed instrument

7mm x 7mm