Tilt sensor with magnetic liquid

Olaru, Radu; Cotae, C.

doi:10.1016/s0924-4247(97)80162-8

Cited by 45 publications

(20 citation statements)

References 2 publications

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“…The concept behind an inclinometer is that it performs measurements of various responses generated by pendulum behaviour caused by gravity [26]. A number of pendulum behaviours exist, including solid mass [28], liquid [29] and gas [30,31], and measured using resistive [32], capacitive [33], inductive [34], magnetic [35], fibre-optic [36] or optical [37] methods. Rotation can be easily calculated in X-and Y-directions by projecting the gravity vector on the axes of acceleration.…”

Section: Introduction To Inertial Sensors and Rotational Measurementsmentioning

confidence: 99%

Tracking bridge tilt behaviour using sensor fusion techniques

Faulkner

Wang

Huseynov

2020

J Civil Struct Health Monit

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The resilience of the built environment to extreme weather events is fundamental for the day-today operation of our transport network, with scour representing one of the biggest threats to bridges built over flowing water. Condition monitoring of the bridge using a structural health monitoring system enhances resilience by reducing the time needed to return the bridge to normal use by providing timely information on structural condition and safety. The work presented in this report discusses use of rotational measurements in structural health monitoring. Traditionally tiltmeters (which can be a form of DC accelerometer) are used to measure rotation but are known to be affected by dynamic movements, while gyroscopes react quickly to dynamic motion but drift over time. This review will introduce gyroscopes as a complementary sensor for accelerometer rotational measurements and use sensor fusion techniques to combine the measurements from both sensors to get an optimised rotational result. This method was trialled on a laboratory scaled model, before the system was installed on an in-service single-span skewed railway bridge. The rotational measurements were compared against rotation measurements obtained using a vision-based measurement system to confirm the validity of the results. An introduction to gyroscopes, field test measurement results with the sensors and their correlation with the vision-based measurement results are presented in this article.

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Section: Introduction To Inertial Sensors and Rotational Measurementsmentioning

confidence: 99%

Tracking bridge tilt behaviour using sensor fusion techniques

Faulkner

Wang

Huseynov

2020

J Civil Struct Health Monit

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“…They can also be applied to platform levering, boom angle indication, slope angle measurement, etc. Most conventional tilt sensors are realized by transforming the inclination into electric signals through a magnetic effect [5,6] or capacitive effect [9]. A significant number of optical inclinometers reported are based on fiber Bragg gratings (FBGs) coupled to a vertical pendulum.…”

Section: Introductionmentioning

confidence: 99%

Interferometric optical fiber inclinometer with dynamic FBG based interrogation

et al. 2011

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The development of an interferometric optical fiber inclinometer is described in this paper. A weak tapered region is induced in a standard single mode fiber in the vicinity of the cleaved fiber tip, using a standard fusion splicer. In this situation an in-fiber Michelson interferometer is constructed that is sensitive to curvature applied in the tapered region. It is shown that depending on the angular range, fringe visibility and/or peak position depend strongly on the applied curvature enabling low cost dielectric inclinometer to be setup that is suitable for high voltage applications. It is presented an analysis of the sensor response by means of experimental measurements and manipulation of these experimental data through computational simulations. The results coming from the numerical simulations indicate a good performance of the sensor within range of angular variation between 3 and 6 degrees and 10 and 14 degrees. A low cost strategy to interrogate the response of sensor using electrically modulated fiber Bragg gratings, a photodetector and frequency analysis is described. The results presented by this electric interrogation technique show a good sensitivity in the range 3.5 to 5.5 degrees.

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“…Most conventional tilt sensors are realized by transforming the inclination into electrical signals through a magnetic effect [1] or capacitive effect [2]. In the last two decades, optical fiber Bragg gratings (FBGs) have been widely studied as sensing elements for measurement of temperature, strain [3][4][5], pressure [6], force [7], acceleration [8], tilt angle [9][10][11], etc.…”

Section: Introductionmentioning

confidence: 99%