C. R. Coggrave
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View article: De-pixelating phase mask for digital fringe projection
De-pixelating phase mask for digital fringe projection Open
View article: Single-shot wavelength meter on a chip based on exponentially increasing delays and in-phase quadrature detection
Single-shot wavelength meter on a chip based on exponentially increasing delays and in-phase quadrature detection Open
View article: Transmission mode synthetic aperture interferometry using a compact coherent imager and switched fiber-optic illumination
Transmission mode synthetic aperture interferometry using a compact coherent imager and switched fiber-optic illumination Open
This paper discusses a modular implementation of synthetic aperture interferometry (SAI) using inexpensive telecommunications technologies that can be expanded for use in optical instruments with arbitrarily large fields of view. Exploitin…
View article: Adaptive delay lines implemented on a photonics chip for extended-range, high-speed absolute distance measurement
Adaptive delay lines implemented on a photonics chip for extended-range, high-speed absolute distance measurement Open
High-speed (upwards of 105 coordinates s-1) and long-range (~10 m) absolute distance measurement applications based on frequency scanning interferometry (FSI) generate very high modulation frequencies (typically >1…
View article: Single-shot wavelength meter on a photonic chip for absolute distance measurement using frequency scanning interferometry
Single-shot wavelength meter on a photonic chip for absolute distance measurement using frequency scanning interferometry Open
A chip-scale solid-state wavelength measuring device based on a silicon photonics platform is presented. It has no moving parts and allows single-shot wavelength measurement with high precision over a nominal bandwidth of 40 nm in the Oban…
View article: High speed fringe projection for dynamic shape measurement using binary phase mask. Part 1: theory and simulation
High speed fringe projection for dynamic shape measurement using binary phase mask. Part 1: theory and simulation Open
Projection rates of up to 30,000 greyscale fringe patterns per second have been achieved recently by defocusing binary fringe patterns from a digital micromirror device (DMD) based projector. Part 1 of this two-part paper describes the des…
View article: High speed fringe projection for dynamic shape measurement using binary phase mask. Part 2: manufacture and test
High speed fringe projection for dynamic shape measurement using binary phase mask. Part 2: manufacture and test Open
Dynamic measurement of object shape is now achievable at projection rates of up to 30,000 binary fringe patterns per second from a digital micromirror device (DMD) based projector. This two-part paper describes the design, manufacture and …
View article: Coherent imager module with a large field of view for synthetic aperture interferometry applications
Coherent imager module with a large field of view for synthetic aperture interferometry applications Open
Optical areal profilometry of large precision-engineered surfaces require high-resolution measurements over large fields of view. Synthetic Aperture Interferometry (SAI) offers an alternative to the conventional approach of stitching small…
View article: High-NA lensless coherent imager as a building block for a synthetic aperture interferometry array
High-NA lensless coherent imager as a building block for a synthetic aperture interferometry array Open
In digital holography, the field of view (FOV) and lateral resolution are limited by the pixel pitch and sensor dimensions, respectively. A large numerical aperture can be synthesized to increase the FOV and spatial resolution by coherentl…
View article: Characterization of the reference wave in a compact digital holographic camera
Characterization of the reference wave in a compact digital holographic camera Open
A hologram is a recording of the interference between an unknown object wave and a coherent reference wave. Providing the object and reference waves are sufficiently separated in some region of space and the reference beam is known, a high…