Mottier's technique of matching the reference beam modulation to the object beam modulation is shown to be a special case of local reference beam (LRB) holography. A hand‐held object beam mirror is used to produce a good LRB hologram. A new form of LRB holographic interferometry, which measures the changes with respect to a preselected part of the object, is discussed.

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© 1970 The American Institute of Physics.
1970
The American Institute of Physics
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