A Ferrofluidic Inclinometer in the Resonant Configuration

Andò, B.; Ascia, A.; Baglio, Salvatore

doi:10.1109/tim.2009.2024705

Cited by 35 publications

(16 citation statements)

References 9 publications

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“…Among ferrofluid based devices, a strong interest has been manifested in the development of efficient inertial sensors, with particular regards to inclinometers, as demonstrated by a rich state of the art [6,7]. This paper presents an optical inclinometer exploiting a ferrofluid mass, which uses an InfraRed readout strategy, a magnetic shaping system, which assures an optimal shape to the ferrofluid mass, and a dedicated paradigm to process signals provided by the IR detectors, with the aim of defining a calibration model relating the inclinometer output quantity to the imposed tilt.…”

Section: Introductionmentioning

confidence: 99%

An Optical Inclinometer Exploiting Magnetic Fluids

et al. 2018

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Among sensors using magnetic fluids, inclinometers are seriously addressed by the scientific community. This paper deals with an optical inclinometer exploiting a ferrofluid (FF) mass, a magnetic shaping system and an InfraRed (IR) readout strategy. A dedicated paradigm is also proposed, with the aim of defining a calibration model relating the inclinometer output quantity to the imposed tilt. The working range of the inclinometer is [−15°-15°]; the sensor accuracy and resolution are 0.61° and 0.005°, respectively. Moreover, the device shows a span-to-resolution ratio of 6 × 10 3 .

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Section: Introductionmentioning

confidence: 99%

An Optical Inclinometer Exploiting Magnetic Fluids

et al. 2018

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“…the material that responds to changes in the orientation of gravity, is one way to classify current tilt sensors: solid pendulum [10], liquid pendulum [11] and gaseous pendulum [12] sensors. The methods for detecting the current state of the pendulum are wide-spread and include resistive [13], capacitive [14], inductive [15], optical [16], fiber optic [17] and magnetic [18] measurements. In previous work, we have already demonstrated a tilt switch based on a resistive measurement principle [19].…”

Section: Introductionmentioning

confidence: 99%

Fabrication, Modeling, and Evaluation of a Digital Output Tilt Sensor With Conductive Microspheres

et al. 2017

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Abstract-Recent advances in wearable computing ask for bendable and conformable electronic circuits and sensors, allowing an easy integration into everyday life objects. Here, we present a novel flexible tilt sensor on plastic using conductive microspheres as gravity sensitive pendulum. The sensor provides a digital output of the measurement signal without the need for any additional electronics (e.g. amplifiers) close to the sensing structure. The sensor is fabricated on a free-standing polyimide foil with SU-8 photoresist defining the cavity for the pendulum. The pendulum consists of freely movable conductive microspheres which, depending on the sense of gravity, connect different electric contacts patterned on the polyimide foil. We develop a model of the sensor and identify the amount of microspheres as one of the key parameters in the sensor design which influences the performance of the sensor. The presented tilt sensor with eight contacts achieves an angular resolution of 22.5• with a hysteresis of 10• and less at a tilt of the sensor plane of 50• . Analysis of the microsphere movements reveals a response time of the sensor at ∼ 50 ms.

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“…a pipe). The resonant configuration of the ferrofluidic inclinometer addressed in [4] is very similar to the architecture presented in [3], with the exception of two actuation coils which have been used to move the ferrofluid mass back and forth inside the channel at the mechanical resonance frequency of the system. The resonant operation mode allows to improve the performances of the inclinometer in terms of its mechanical sensitivity, by avoiding the adhesion of the ferrofluid to the glass pipe and thus reducing the static friction.…”

Section: Introductionmentioning

confidence: 99%

“…This strategy, with respect to previous solutions [3]- [4], allows to implement a device with an intrinsic frequency output.…”

Section: Introductionmentioning

confidence: 99%

A novel inclinometer exploiting magnetic fluids and an IR readout strategy

Andò

Baglio

Pistorio

2015

2015 IEEE Sensors Applications Symposium (SAS)

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This paper deals with the prototyping and a preliminary characterization of a novel inclinometer exploiting magnetic fluids and an optical readout strategy. The proposed inclinometer consists of a 5 mm diameter glass pipe containing a ferrofluid drop, a permanent magnet to generate a retaining force on the ferrofluidic drop and an infrared (IR) readout strategy to detect the ferrofluid position inside the pipe. The latter is correlated to the glass pipe tilt.The main advantages of the sensor proposed, with respect to previous devices already available in the literature, consist in the use of a permanent magnet to control the ferrofluid mass position and the adopted IR readout strategy, which produce a meaningful reduction of the power consumption, as respect to systems using an inductive readout strategy and the active control of the inertial mass.Features obtained by the experimental characterization of the prototype developed encourages the use of the sensing methodology proposed and the development of devices exploiting the sensing approach above mentioned. Keywords-inclinometer; ferrofluid active mass; infrared (IR) readout.

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A Ferrofluidic Inclinometer in the Resonant Configuration

Cited by 35 publications

References 9 publications

An Optical Inclinometer Exploiting Magnetic Fluids

An Optical Inclinometer Exploiting Magnetic Fluids

Fabrication, Modeling, and Evaluation of a Digital Output Tilt Sensor With Conductive Microspheres

A novel inclinometer exploiting magnetic fluids and an IR readout strategy

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