Insect-inspired distributed flow-sensing: Fluid-mediated coupling between sensors

Gijs Krijnen, Thomas Steinmann, Ram K. Jaganatharaja, Jérôme Casas

Research output: Chapter in Book/Report/Conference proceedingChapterAcademicpeer-review

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Abstract

Crickets and other arthropods are evolved with numerous flow-sensitive hairs on their body. These sensory hairs have garnered interest among scientists resulting in the development of bio-inspired artificial hair-shaped flow sensors. Flow-sensitive hairs are arranged in dense arrays, both in natural and bio-inspired cases. Do the hair-sensors which occur in closely-packed settings affect each other's performance by so-called viscous coupling? Answering this question is key to the optimal arrangement of hair-sensors for future applications.
In this work viscous coupling is investigated from two angles. First, what does the existence of many hairs at close mutual distance mean for the flow profiles? How is the air-flow around a hair changed by it's neighbours proximity? Secondly, in what way do the incurred differences in air-flow profile alter the drag-torque on the hairs and their subsequent rotations? The first question is attacked both from a theoretical approach as well as by experimental investigations using particle image velocimetry to observe air flow profiles around regular arrays of millimeter sized micro-machined pillar structures. Both approaches confirm significant reductions in flow-velocity for high density hair arrays in dependence of air-flow frequency. For the second set of questions we used dedicated micro-fabricated chips consisting of artificial hair-sensors to controllably and reliably investigate viscous coupling effects between hair-sensors.
The experimental results confirm the presence of coupling effects (including secondary) between hair-sensors when placed at inter-hair distances of less than 10 hair diameters ($d$). Moreover, these results give a thorough insight into viscous coupling effects. Insight which can be used equally well to further our understanding of the biological implications of high density arrays as well as have a better base for the design of biomimetic artificial hair-sensor arrays where spatial resolution needs to be balanced by sufficiently mutually decoupled hair-sensor responses
Original languageEnglish
Title of host publicationArchitectured Materials in Nature and Engineering
EditorsYuri Estrin, Yves Bréchet, John Dunlop, Peter Fratzl
Place of PublicationCham
PublisherSpringer
Chapter12
Pages355-392
ISBN (Electronic)978-3-030-11942-3
ISBN (Print)978-3-030-11941-6
DOIs
Publication statusPublished - Apr 2019

Publication series

NameSpringer Series in Materials Science
PublisherSpringer
Volume282
ISSN (Print)0933-033X
ISSN (Electronic)2196-2812

Fingerprint

insects
hair
fluids
sensors
air flow
crickets
profiles
arthropods
biomimetics
particle image velocimetry

Keywords

  • hairbased flow-sensing
  • viscous coupling
  • crickets
  • sensor-arrays

Cite this

Krijnen, G., Steinmann, T., Jaganatharaja, R. K., & Casas, J. (2019). Insect-inspired distributed flow-sensing: Fluid-mediated coupling between sensors. In Y. Estrin, Y. Bréchet, J. Dunlop, & P. Fratzl (Eds.), Architectured Materials in Nature and Engineering (pp. 355-392). (Springer Series in Materials Science; Vol. 282). Cham: Springer. https://doi.org/10.1007/978-3-030-11942-3_12
Krijnen, Gijs ; Steinmann, Thomas ; Jaganatharaja, Ram K. ; Casas, Jérôme. / Insect-inspired distributed flow-sensing : Fluid-mediated coupling between sensors. Architectured Materials in Nature and Engineering. editor / Yuri Estrin ; Yves Bréchet ; John Dunlop ; Peter Fratzl. Cham : Springer, 2019. pp. 355-392 (Springer Series in Materials Science).
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Krijnen, G, Steinmann, T, Jaganatharaja, RK & Casas, J 2019, Insect-inspired distributed flow-sensing: Fluid-mediated coupling between sensors. in Y Estrin, Y Bréchet, J Dunlop & P Fratzl (eds), Architectured Materials in Nature and Engineering. Springer Series in Materials Science, vol. 282, Springer, Cham, pp. 355-392. https://doi.org/10.1007/978-3-030-11942-3_12

Insect-inspired distributed flow-sensing : Fluid-mediated coupling between sensors. / Krijnen, Gijs; Steinmann, Thomas; Jaganatharaja, Ram K.; Casas, Jérôme.

Architectured Materials in Nature and Engineering. ed. / Yuri Estrin; Yves Bréchet; John Dunlop; Peter Fratzl. Cham : Springer, 2019. p. 355-392 (Springer Series in Materials Science; Vol. 282).

Research output: Chapter in Book/Report/Conference proceedingChapterAcademicpeer-review

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N2 - Crickets and other arthropods are evolved with numerous flow-sensitive hairs on their body. These sensory hairs have garnered interest among scientists resulting in the development of bio-inspired artificial hair-shaped flow sensors. Flow-sensitive hairs are arranged in dense arrays, both in natural and bio-inspired cases. Do the hair-sensors which occur in closely-packed settings affect each other's performance by so-called viscous coupling? Answering this question is key to the optimal arrangement of hair-sensors for future applications. In this work viscous coupling is investigated from two angles. First, what does the existence of many hairs at close mutual distance mean for the flow profiles? How is the air-flow around a hair changed by it's neighbours proximity? Secondly, in what way do the incurred differences in air-flow profile alter the drag-torque on the hairs and their subsequent rotations? The first question is attacked both from a theoretical approach as well as by experimental investigations using particle image velocimetry to observe air flow profiles around regular arrays of millimeter sized micro-machined pillar structures. Both approaches confirm significant reductions in flow-velocity for high density hair arrays in dependence of air-flow frequency. For the second set of questions we used dedicated micro-fabricated chips consisting of artificial hair-sensors to controllably and reliably investigate viscous coupling effects between hair-sensors.The experimental results confirm the presence of coupling effects (including secondary) between hair-sensors when placed at inter-hair distances of less than 10 hair diameters ($d$). Moreover, these results give a thorough insight into viscous coupling effects. Insight which can be used equally well to further our understanding of the biological implications of high density arrays as well as have a better base for the design of biomimetic artificial hair-sensor arrays where spatial resolution needs to be balanced by sufficiently mutually decoupled hair-sensor responses

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Krijnen G, Steinmann T, Jaganatharaja RK, Casas J. Insect-inspired distributed flow-sensing: Fluid-mediated coupling between sensors. In Estrin Y, Bréchet Y, Dunlop J, Fratzl P, editors, Architectured Materials in Nature and Engineering. Cham: Springer. 2019. p. 355-392. (Springer Series in Materials Science). https://doi.org/10.1007/978-3-030-11942-3_12