FocalSpec chromatic line confocal sensor technology is presented. Performance of the technology is described in terms of z-precision and accuracy. We report on the latest technical developments that improve the measuring speed by 6x. With these developments we are able to deliver sub-micron precise 3D point clouds with speeds up to 24 Million points per second. Potential applications are discussed.
Automatic surface inspection has been used in the industry to reliably detect all kinds of surface defects and
to measure the overall quality of a produced piece. Structured light systems (SLS) are based on the reconstruction
of the 3D information of a selected area by projecting several phase-shifted sinusoidal patterns onto
a surface. Due to the high speed of production lines, surface inspection systems require extremely fast imaging
methods and lots of computational power. The cost of such systems can easily become considerable. The use
of standard PCs and Graphics Processing Units (GPUs) for data processing tasks facilitates the construction
of cost-effective systems. We present a parallel implementation of the required algorithms written in C with
CUDA extensions. In our contribution, we describe the challenges of the design on a GPU, compared with a
traditional CPU implementation. We provide a qualitative evaluation of the results and a comparison of the
algorithm speed performance on several platforms. The system is able to compute two megapixels height maps
with 100 micrometers spatial resolution in less than 200ms on a mid-budget laptop. Our GPU implementation
runs about ten times faster than our previous C code implementation.
A novel add-on device to a mobile camera phone has been developed. The prototype system contains both laser and LED illumination as well as imaging optics. Main idea behind the device is to have a small printable diffractive ROM (Read Only Memory) element, which can be read by illuminating it with a laser-beam and recording the resulting
datamatrix pattern with a camera phone. The element contains information in the same manner as a traditional bar-code, but due to the 2D-pattern and diffractive nature of the tag, a much larger amount of information can be packed on a smaller area. Optical and mechanical designs of the prototype device have been made in such a way that the system can be used in three different modes: as a laser reader, as a telescope and as a microscope.