Reciprocity in laser ultrasound revisited: Is wavefield characterisation by scanning laser excitation strictly reciprocal to that by scanning laser detection?
arxiv(2024)
摘要
The common believe about strict measurement reciprocity between scanning
laser detection and scanning laser excitation is disproved by a simple
experiment. Nevertheless, a deeper study based on the reciprocity relation
reveals correct reciprocal measurement set-ups for both the probe-excitation /
laser-detection and the laser-excitation / probe-detection case. Similarly, the
all-laser measurement, that is thermoelastic laser excitation with laser
vibrometer detection, is not in general reciprocal with respect to the exchange
of excitation and detection positions. Again, a substitute for the laser
doppler vibrometer out-of-plane displacement measurement was found which
ensures measurement reciprocity together with laser excitation. The apparent
confusion in literature about strict validity/non-validity of measurement
reciprocity is mitigated by classifying the measurement situations
systematically.
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