CILIA - Customized Intelligent Life-inspired Arrays

Project funded by the Future and Emergent Technologies arm of the IST Programme in the 6th Framework Programme

6th Framework Programme
Workpackage 1.2: Mechanoreceptor structural properties and fluid-sensor interactions


Respons to stimulus of two cricket hairs in the range 1-10000 Hz


Hair socket and campaniforms from Confocal Microscopy


Angular excursions of an array of stimulated hairs on a cercum (High speed camera data)

The response of cricket's sensing hairs to air-flow depends on morphological details (length, diameter, taper) as well as on mechanical properties of various tissues.

In addition, hairs have a preferred plane of oscillation (directivity) which is determined by the geometry of the anchorage at their base. The response of single hairs to stimuli is obtained from vibration measurements on hairs, of different lengths and directivity. The stimuli are typically oscillatory air flows of various frequencies. The response (frequencies, amplitudes, damping) is characterised either with a High Speed Camera or by Scanning Laser Vibrometry. Elastic and damping properties of the various components of the hair mechanosensors are obtained from these measurements.

The directivity of the hairs can be inferred from the location of campaniform sense organs at the base of the hair socket (the axis across the campaniforms is perpendicular to the preferred plane of oscillation of the hairs). The distribution of directivities on the cercum, together with the distribution of hair lengths, contributes to determine the array behaviour of the hair canopy. Using high speed camera techniques the behaviour of the hair array, stimulated with steady-state or oscillatory air flows inputs, can be characterised.