Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-destructive testing of composite plates by holographic vibrometry   We report on a wide-field optical monitoring method for revealing local
delaminations in sandwich-type composite plates at video-rate by holographic
vibrometry. Non-contact measurements of low frequency flexural waves is
performed with time-averaged heterodyne holography. It enables narrowband
imaging of local out-of-plane nanometric vibration amplitudes under sinusoidal
excitation, and reveals delamination defects, which cause local resonances of
flexural waves. The size of the defect can be estimated from the first
resonance frequency of the flexural wave and the mechanical parameters of the
observed layer of the composite plate.

10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom