Papers by Keyword: Bio-Inspired Sensor

Abstract: It is essential to develop ultrasensitive low frequency sensors for efficient structural health monitoring and early warning of natural disasters. Many fishes have been reported to have acute sensitivity to low frequency. Based on the mechanism of the infrasound sensitivity of fish, mechanism of bio-inspired ultrasensitive low frequency sensor is explored by a mechanical model with gating spring hypothesis for simulating the mechanical-electricity transduction of the hair cell in fish ear. Numerical analyses of the mechanical model subject to static and dynamic loading are conducted respectively by OpenSees. Under static loading, displacement response of gating model is more sensitive to weak loading due to the opening of gating spring. Under dynamic loading, the gating model is more acute sensitive to low frequency and weak loading due to the adaptive amplification of gating spring. This mechanical function can be used as the theoretical basis for the design of ultrasensitive bio-inspired low frequency sensors.

Abstract: In this work an attempt to obtain a more compact artificial system for gas sensing, properly designed on a transducer, is presented. This novel device can be applied for a wide application range such as environmental, bio-medical, agriculture etc. fields. In the Nature, a mucous layer covering olfactory receptor cells, selectively tunes chemical interactions among odorous molecules and sensing system. An odor, in fact, is perceived only if it is able to cross mucus of nasal cavity. A proper hydrophobic Teflon-like overcoating tunes chemical interactions, humidity free, between odorous molecules and sensing system, miming mucus covering olfactory receptor cells. Here the latters were represented by doped polyaniline added of polyethylenoxide. The interacting surface has been enormously enhanced creating nanofibrous coatings by electrospinning deposition technique. Such nanofibers can be compared with the olfactory cilia covered by mucus. Few modifications of both overlayers and nanofibrous polymers can encourage the developing of new chemical sensors for array sensor system generations. Surfaces analysis, electrical parameters and sensing properties of the double layers on interdigitated transducers have been investigated.