An air flow sensor modeled on wind receptor hairs of insects

Ozaki, Yoshihiko; Ohyama, Takahiro; Yasuda, Takashi; Shimoyama, Isao

doi:10.1109/memsys.2000.838573

Cited by 94 publications

(81 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Capacitive detection systems were used to imitate sensory hairs found on cricket cerci [44,45,60,61]. In these systems, the bending of a hair-like structure deforms the membrane of a capacitor.…”

Section: Biomimetic Flow Sensors: State Of the Artmentioning

confidence: 99%

Micro-Machined Flow Sensors Mimicking Lateral Line Canal Neuromasts

et al. 2015

View full text Add to dashboard Cite

Fish sense water motions with their lateral line.The lateral line is a sensory system that contains up to several thousand mechanoreceptors, called neuromasts. Neuromasts occur freestanding on the skin and in subepidermal canals. We developed arrays of flow sensors based on lateral line canal neuromasts using a biomimetic approach. Each flow sensor was equipped with a PDMS (polydimethylsiloxane) lamella integrated into a canal system by means of thick-and thin-film technology. Our artificial lateral line system can estimate bulk flow velocity from the spatio-temporal propagation of flow fluctuations. Based on the modular sensor design, we were able to detect flow rates in an industrial application of tap water flow metering. Our sensory system withstood water pressures of up to six bar. We used finite element modeling to study the fluid flow inside the canal system and how this flow depends on canal dimensions. In a second set of experiments, we separated the flow sensors from the main stream by means of a flexible membrane. Nevertheless, these biomimetic neuromasts were still able to sense flow fluctuations. Fluid separation is a prerequisite for flow measurements in medical and pharmaceutical applications.

show abstract

Section: Biomimetic Flow Sensors: State Of the Artmentioning

confidence: 99%

Micro-Machined Flow Sensors Mimicking Lateral Line Canal Neuromasts

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Several research groups have worked on the development of artificial hair-flow sensors. Sensing of DC-flows using hair-inspired flow sensors was shown by Ozaki et al [7]. They fabricated artificial hairs using cantilevers with read-out by strain gauges, and demonstrated the measurement of flow velocities up to 2 m/s.…”

Section: Introductionmentioning

confidence: 99%

Tunable Sensor Response by Voltage-Control in Biomimetic Hair Flow Sensors

et al. 2013

View full text Add to dashboard Cite

Abstract:We present an overview of improvements in detection limit and responsivity of our biomimetic hair flow sensors by electrostatic spring-softening (ESS). Applying a DCbias voltage to our capacitive flow sensors improves the responsivity by up to 80% for flow signals at frequencies below the sensor's resonance. Application of frequency matched AC-bias voltages allows for tunable filtering and selective gain up to 20 dB. Furthermore, the quality and fidelity of low frequency flow measurements can be improved using a non frequency-matched AC-bias voltage, resulting in a flow detection limit down to 5 mm/s at low (30 Hz) frequencies. The merits and applicability of the three methods are discussed.

show abstract

“…1,2) Theoretical analysis to estimate hydrodynamic forces acting on a cantilever with thickness, (a rectangular solid) have clarified 3) the characteristics of such micro-flow sensors. At low Reynolds numbers (Re % 1), the difference between aerodynamic forces acting on a bristled wing and on a membranous wing with the same outline is small.…”

mentioning

confidence: 99%

Fluid Dynamic Forces Acting on Rectangular Plate with Hole in Stokes Flow

Sunada

Tokutake

Okada

2010

Trans. Japan Soc. Aero. S Sci.

View full text Add to dashboard Cite

The effect of a hole on aerodynamic forces acting on a rectangular plate in Stokes flow is shown. The effect does not depend strongly on the area or location of the hole, because the hydrodynamic forces near the hole are increased and because the effect of the hole on the hydrodynamic forces acting on the plate is decreased. This result can be used to decrease the mass of a cantilever in a micro-flow sensor without affecting its characteristics. When this micro-flow sensor is attached to a flapping wing, the decrease in sensor mass is important because inertia acting on the sensor causes deformation of the flapping wing. This result is important in understanding the flight of insects with bristled wings.Key Words: Viscous Flows, Stokes Flow, Micro Flow Sensor Micro-flow sensors composed of a cantilever have been developed.1,2) Theoretical analysis to estimate hydrodynamic forces acting on a cantilever with thickness, (a rectangular solid) have clarified 3) the characteristics of such micro-flow sensors. At low Reynolds numbers (Re % 1), the difference between aerodynamic forces acting on a bristled wing and on a membranous wing with the same outline is small. 4) If aerodynamic forces acting on a cantilever in a micro-flow sensor are independent of hole size, we can decrease the mass of a micro-flow sensor without affecting its characteristics. When this sensor is attached to a flapping wing, 2) the decrease in sensor mass is important because inertia acting on the sensor causes deformation of the flapping wing. This paper shows how a hole in a plate without thickness affects the aerodynamic forces acting on the plate in Stokes flow. Moreover, the results clarify our understanding of the flight of an insect with bristled wings. 5,6) Numerical MethodAs shown in Fig. 1, the rectangular plateThe centers of the plate and hole are located at (0,0) and (X h ,Y h ), respectively. The plate is considered in uniform flows U X , U Y , or U Z . Note that the hydrodynamic forces in the X, Y, and Z directions acting on an object in Stokes flow are determined by the uniform flow velocity in each direction. The Reynolds number is definedThe Stokes flow around a rectangular plate with a hole in uniform flow was investigated by boundary-element analysis. The details of the analytical method are explained elsewhere. 7,8) Here, the method is explained simply. The velocity u i ðxÞ at point x on the plate is satisfied by the following equation:where,H ij ðx; yÞ ¼ À 3 4%R 5 r i r j ðr i n i Þ;y, À , p, ij , and n are a point on the plate, the plate surface area, the pressure, the Kronecker delta, and a unit outward normal on the plate surface, respectively. From the boundary condition, when the total flow velocity is 0 on the plate surface, u i ðxÞ is given by U X , U Y , and U Z . The plate surface is divided into many rectangular elements, and solving Eq. (1) gives the values of p and @u i @x 3 (i ¼ 1, 2) for each element. Moreover, the aerodynamic forces acting on the plate are calculated from the values of p and2) on each element....

show abstract

An air flow sensor modeled on wind receptor hairs of insects

Cited by 94 publications

References 4 publications

Micro-Machined Flow Sensors Mimicking Lateral Line Canal Neuromasts

Micro-Machined Flow Sensors Mimicking Lateral Line Canal Neuromasts

Tunable Sensor Response by Voltage-Control in Biomimetic Hair Flow Sensors

Fluid Dynamic Forces Acting on Rectangular Plate with Hole in Stokes Flow

Contact Info

Product

Resources

About