What does DD stand for?

Doppler Displacement

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

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Samples in periodicals archive:

However, such single-aperture laser interferometers as a Laser Doppler Displacement Meter (LDDM) can be used.

Understanding volumetric positioning errors: body diagonal ...

Using Optodyne's Laser Doppler displacement meter (LDDM), the sequential step diagonal or vector measurement, 12 sets of data can be collected by the four sequential step diagonal measurements.

A call for a 3D standard

A laser Doppler displacement meter, using a, single-aperture laser head and a flat-mirror as target, is used when the vector method is applied.

Machine tool accuracy: What's the best measure?