Scanning LDV for vibration measurement of filiform hairs in crickets in response to induced airflow - art. no. 63450E
Santulli, C., Finn, T. J., Seidel, R. and Jeronimidis, G. (2006) Scanning LDV for vibration measurement of filiform hairs in crickets in response to induced airflow - art. no. 63450E. In: Tomasini, E. P. (ed.) Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications. Proceedings of the Society of Photo-Optical Instrumentation Engineers (Spie), 6345. Spie-Int Soc Optical Engineering, Bellingham, E3450-E3450. ISBN 081946421X
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To link to this article DOI: 10.1117/12.693153
Cercal hairs represent in cricket a wind sensitive escape system, able to detect the airflow generated from predating species. These sensors have been studied as a biomimetic concept to allow the development of MEMS for biomedical use. In particular, the behaviour of the hairs, including airflow response, resonant frequency and damping, has been investigated up to a frequency of 20 kHz. The microscopic nature of the hairs, the complex vibrations of excited hairs and the high damping of the system suggested that the use of Laser Doppler vibrometry could possibly improve the test performance. Two types of tests were performed: in the first case the hairs were indirectly excited using the signal obtained from a vibrating aluminium plate, whilst in the second case the hairs were directly excited using a white noise chirp. The results from the first experiment indicated that the hairs move in-phase with the exciting signal up to frequencies in the order of 10 kHz, responding to the vibration modes of the plate with a signal attenuation of 12 to 20 dB. The chirp experiment revealed the presence of rotational resonant modes at 6850 and 11300 Hz. No clear effect of hair length was perceivable on the vibration response of the filiform sensors. The obtained results proved promising to support the mechanical and vibration characterisation of the hairs and suggest that scanning Laser vibrometry can be used extensively on highly dampened biological materials.