Reciprocity in laser ultrasound revisited: Is wavefield characterisation by scanning laser excitation strictly reciprocal to that by scanning laser detection?
<|reference_start|>Reciprocity in laser ultrasound revisited: Is wavefield characterisation by scanning laser excitation strictly reciprocal to that by scanning laser detection?: 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.<|reference_end|>
@article{köhler2024reciprocity,
    title={Reciprocity in laser ultrasound revisited: Is wavefield characterisation
  by scanning laser excitation strictly reciprocal to that by scanning laser
  detection?},
    author={Bernd K"ohler, Yuui Amano, Frank Schubert, Kazuyuki Nakahata},
    journal={arXiv preprint arXiv:2404.16424},
    year={2024},
    archivePrefix={arXiv},
    eprint={2404.16424},
    primaryClass={physics.ins-det cs.SY eess.SY physics.optics}
}