Elastic filament velocimetry (EFV)

Fu, Matthew; Fan, Yitong; Byers, Clayton; Chen, T. H.; Arnold, Craig B.; Hultmark, Marcus

doi:10.1088/1361-6501/28/2/025301

Cited by 7 publications

(21 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results are shown in figure 3, which show the response time to be 22 µs in air and 0.28 µs in water, which is in agreement with [5]. These calculated results both match the estimated order of magnitude of the timescale from equation (11). While two orders of magnitude in increased response time is impressive, these results are to be expected, as water is significantly better at conducting heat compared to air.…”

Section: Temporal Response-constant Current Anemometrysupporting

confidence: 71%

“…The ability to obtain two components of velocity through a single sensing element requires a sensor with two independent preferential directions when utilized under different modes of operation. By coupling the unique sensing capabilities of elastic filament velocimetry (EFV) [11] with traditional hot wire anemometry, two components of velocity can be extracted in an instantaneous sense.…”

Section: Sensing Modesmentioning

confidence: 99%

“…Elastic filament velocimetry, as outlined by Fu et al [11], is utilized as the second mode to measure velocity. Rather than measuring changes in resistance due to heat transfer, in EFV the velocity is correlated to strain in a nanoribbon.…”

Section: Sensing Modesmentioning

confidence: 99%

“…Characterization of the response time of the nanoribbon when operated in the EFV mode is done by evaluating the modified damped harmonic oscillator equation for the nanoribbon [11]:…”

Section: Temporal Response-elastic Filament Velocimetrymentioning

confidence: 99%

See 3 more Smart Citations

Development of instrumentation for measurements of two components of velocity with a single sensing element

Byers

Fan

et al. 2018

Meas. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

A novel method of obtaining two orthogonal velocity components with high spatial and temporal resolution is investigated. Both components are obtained utilizing a single sensing nanoribbon by combining the two independent operating modes of classic hot wire anemometry and the newly discovered elastic filament velocimetry (EFV). In contrast to hot wire anemometry, EFV measures fluid velocity through correlating the fluid forcing with the internal strain of the wire. In order to utilize both modes of operation, a system that switches between the two operating modes is built and characterized, and the theoretically predicted sensing response time in water is compared to experimental results. The sensing system is capable of switching between the two modes of operation at a frequency of 100 kHz with minimal attenuation with an uncompensated repetition rate up to 3 kHz or up to 10 kHz utilizing modest signal compensation. While further characterization of the sensor performance in air is needed, this methodology enables a technique for obtaining wellresolved yet cost-efficient directional measurements of flow velocities which, for example, can be used for distributed measurements of velocity or measurements of turbulent stresses with excellent spatial resolution.

show abstract

Section: Temporal Response-constant Current Anemometrysupporting

confidence: 71%

Section: Sensing Modesmentioning

confidence: 99%

Section: Sensing Modesmentioning

confidence: 99%

“…Characterization of the response time of the nanoribbon when operated in the EFV mode is done by evaluating the modified damped harmonic oscillator equation for the nanoribbon [11]:…”

Section: Temporal Response-elastic Filament Velocimetrymentioning

confidence: 99%

See 2 more Smart Citations

Development of instrumentation for measurements of two components of velocity with a single sensing element

Byers

Fan

et al. 2018

Meas. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…This low Re d regimen is where the original EFV sensor operates. 40 The large aspect ratio of the ribbon enables its deflection to be described by a nonlinear Euler-Bernoulli equation. Considering a stationary ribbon deflection w(x), where x is the coordinate in the axial direction, the Euler-Bernoulli equation states that…”

Section: Physical Modelmentioning

confidence: 99%

A Soft Material Flow Sensor for Micro Air Vehicles

Sundin

Kokmanian

et al. 2021

Soft Robotics

View full text Add to dashboard Cite

To control and navigate micro air vehicles (MAVs) efficiently, there is a need for small, lightweight, durable, sensitive, fast, and low-power airspeed sensors. When designing sensors to meet these requirements, soft materials are promising alternatives to more traditional materials due to the large deformations they can withstand. In this article, a new concept of a soft material flow sensor is presented based on elastic filament velocimetry, which fulfills all necessary criteria. This technique measures flow velocity by relating it to the strain of a soft ribbon suspended between two static supports and subjected to a flow of interest. The ribbon is manufactured from polydimethylsiloxane and can be made piezoresistive by the addition of silver nanowires. With the described manufacturing method, the sensor can be made using common laboratory tools, outside of a clean room, significantly reducing its complexity. Furthermore, it can be operated using a simple and lightweight circuit, making it a convenient alternative for MAVs. Using a piezoresistive material allows for the flow velocity to be calibrated to the resistance change of the strained ribbon. Although certain challenges remain unsolved, such as polymer creep, the sensor has demonstrated its ability to measure flow velocities down to 4 m/s in air through experiments. A time-dependent analytical model is also provided. The model shows that the current sensor has a bandwidth of 480 Hz. Most importantly, the sensitivity and the bandwidth of the sensor can be varied strictly by modifying the geometry and the material properties of the ribbon.

show abstract

Improving measurement technology for the design of sustainable cities

Pardyjak

Stoll

2017

Meas. Sci. Technol.

View full text Add to dashboard Cite

This review identifies and discusses measurement technology gaps that are currently preventing major science leaps from being realized in the study of urban environmental transport processes. These scientific advances are necessary to better understand the links between atmospheric transport processes in the urban environment, human activities, and potential management strategies. We propose that with various improved and targeted measurements, it will be possible to provide technically sound guidance to policy and decision makers for the design of sustainable cities. This review focuses on full-scale in situ and remotely sensed measurements of atmospheric winds, temperature, and humidity in cities and links measurements to current modeling and simulation needs. A key conclusion of this review is that there is a need for urban-specific measurement techniques including measurements of highly-resolved three-dimensional fields at sampling frequencies high enough to capture small-scale turbulence processes yet also capable of covering spatial extents large enough to simultaneously capture key features of urban heterogeneity and boundary layer processes while also supporting the validation of current and emerging modeling capabilities.

show abstract

Elastic filament velocimetry (EFV)

Cited by 7 publications

References 11 publications

Development of instrumentation for measurements of two components of velocity with a single sensing element

Development of instrumentation for measurements of two components of velocity with a single sensing element

A Soft Material Flow Sensor for Micro Air Vehicles

Improving measurement technology for the design of sustainable cities

Contact Info

Product

Resources

About