The next generation of ultralight dark matter (DM) direct detection experiments, which could confirm sub-eV bosons as the dominant source DM, will feature multiple detectors operating at various terrestrial locations. As a result wave-like nature spatially separated each measure unique DM phase. When separation between experiments is comparable to coherence length, spatially-varying phase conta...

An example of double exposure holographic interferometry. A hologram of the c-c1amp is exposed. The light source is then shuttered and the clamp tightened. A hologram of the strained c-clamp is exposed onto the same recording material. After processing, illumination of the doubly exposed hologram results in the reconstruction of two wavefronts----one corresponding to each amount of strain on th...

Bolometric interferometry is not a new idea, but this technique has not been demonstrated at millimeter wavelengths. The millimeter-wave bolometric interferometer combines the advantages of two well-developed technologies – interferometers and bolometric detectors – and will open a new region of sensitivity and angular resolution not previously accessible to other instruments. 2003 Elsevier B.V...

The spontaneous formation of cracks in biscuits following baking, also known as checking, is an issue that manufacturers would like to be able to predict and avoid. Unfortunately the mechanisms driving this phenomenon are not well understood. Speckle interferometry was used to study moisture-induced in-plane strain development in biscuits. This sensitive and non-contacting technique for measuri...

The review paper will describe the present state of holographic and speckle techniques as applied to industrial measurement. The basic principles of both techniques will be outlined with special attention given to their advantages and limitations. Current developments in the field will then be described including the t~stlng of rotating automobile tyres by holographic interferometry and a heter...