Simple low-frequency optical fiber accelerometer with large rotating machine monitoring applications

Lopez-Hignera, J.-M.; Morante, M. A.; Cobo, A.

doi:10.1109/50.596957

Cited by 64 publications

(36 citation statements)

References 22 publications

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“…In [23] an optical fibre sensor in the form of an in-line fibre etalon (ILFE) was used as a vibrometer to detect the voltage unbalance in induction machines. While in [24] a simple fibre optic accelerometer was developed to monitor low amplitude, low frequency vibrations on large rotating machinery.…”

Section: Principlementioning

confidence: 99%

Use of optical fibres for multi-parameter monitoring in electrical AC machines

Hind

Gerada

Galea

et al. 2017

2017 IEEE 11th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED)

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Section: Principlementioning

confidence: 99%

Use of optical fibres for multi-parameter monitoring in electrical AC machines

Hind

Gerada

Galea

et al. 2017

2017 IEEE 11th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED)

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“…Worst case; transition from air to water, RĀ25mm. 5 resistance variation. Worst case; transition from air to petrol.…”

Section: Pof-based Multi-sensor For Intrinsically Safe Level Measuremmentioning

confidence: 99%

“…Nevertheless, different self-referencing strategies to overcome the shortcomings related to this intensitymodulation encoding technique have been investigated and reported in literature. Configurations based on more than one receiving (multimode) fibers have been applied, as in [5], for acceleration measurements in large rotating machines. Other authors have proposed to minimize the detection of the illumination pattern performed at the end of an emitting optical fiber by means of a photodiode linear array, as in [6], with biomedical applications such as air flow rate measurements supplied by infant ventilators.…”

Section: Introductionmentioning

confidence: 99%

Intensity-Based Optical Systems for Fluid Level Detection

Vázquez

Montero²

2012

EEENG

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Abstract:In this work different patented optical sensing solutions are reviewed, mostly for their application of measuring fluid level within tanks, containers or bio-mass boilers in condominiums, thus providing an intrinsically safe sensing sce-nario within harsh and hazardous environments, due to the passive nature of light. In general, the intensity modulation of the light is very attractive since it is simple in concept, reliable, and can produce optical sensors which offer a wide range of applications at lower costs, thus facilitating their final commercialization and market spread. The optical sensing solu-tions discussed in this work include a fiber-optic sensor for fluid detection/level with intrinsic self-referencing property thus solving one of the main drawbacks when using intensity-based sensors, namely the undesirable and unexpected opti-cal power fluctuations when operating. Moreover, a low-cost intensity-based POF sensor for fuel level measurements in paramotoring and powered paragliding is presented. It features a very simple and a very low-cost solution for these sports, attending the increasing demand of new and more sophisticated embedded sensors in the flight instrumental. Going on from this, a fiber-optic fluid level sensor for a range greater than 2m is described. The system uses a single lens and a sin-gle fiber but being possible to increase the measuring safety area by optical multiplexing. Finally, a fluid level sensor based on a Light Dependent Resistor (LDR), which includes a temperature control scheme, is presented. Its final embodi-ment design is also shown and described.

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“…Besides, the intrinsic wavelength encoding gives the FBG sensors a multiplexing capability that greatly reduces cabling labor. Because of these intrinsic natures, FBG sensors have great potential to be applied to measurands of static and dynamic, such as temperature [1], pressure [2][3][4] and vibration [5][6][7][8][9][10]. FBG vibration sensors are extremely attractive in many industrial fields, such as mine safety monitoring, aerocraft and civil construction.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, this sensor is cost-effective and inherently insensitive to temperature. [5][6][7][8][9][10]. FBG vibration sensors are extremely attractive in many industrial fields, such as mine safety monitoring, aerocraft and civil construction.…”

mentioning

confidence: 99%

Intensity-modulated and temperature-insensitive fiber Bragg grating vibration sensor

Dong

Zhang

et al. 2010

SPIE Proceedings

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Abstract. An intensity-modulated, fiber Bragg grating (FBG) vibration sensor is proposed and experimentally demonstrated. An initially-uniform FBG is glued with a slanted direction onto the lateral surface of a simply-supported beam (SSB). A mass fixed in the middle of the beam transfers the vertical vibration to the deflection of the beam. Nouniform strain field generated by beam bending is applied along the FBG and makes it chirped. The sensing mechanism is based on the measurement of reflected optical power of a strain-chirped FBG. The optical power from the FBG is measured with a photodetector (PD) and an oscilloscope. A resistance strain gauge is used for the comparison purpose and good agreement is achieved. Furthermore, this sensor is cost-effective and inherently insensitive to temperature. [5][6][7][8][9][10]. FBG vibration sensors are extremely attractive in many industrial fields, such as mine safety monitoring, aerocraft and civil construction. Most of previously reported FBG-based vibration sensors are based on the measurement of Bragg wavelength shift of the sensing FBGs. But the FBG sensors based on wavelength demodulation have to monitor the reflection wavelength of FBG, so expensive wavelength measurement instrument are normally used. The measurement speed of wavelength measurement instrument is relatively low. On the other hand, Bragg wavelength shift of the sensing FBGs are also sensitive to temperature. Thus temperature compensation is needed when these reported vibration sensors are used in practical applications. That will add to the cost and complexity of the sensor system.

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Simple low-frequency optical fiber accelerometer with large rotating machine monitoring applications

Cited by 64 publications

References 22 publications

Use of optical fibres for multi-parameter monitoring in electrical AC machines

Use of optical fibres for multi-parameter monitoring in electrical AC machines

Intensity-Based Optical Systems for Fluid Level Detection

Intensity-modulated and temperature-insensitive fiber Bragg grating vibration sensor

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