industrial fiber optic measurement

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fos4X Thalkirchner Str. 210, DE, 81371 München, T: +49 89 99 95 42-00, Email: info@fos4X.dehttps://www.facebook.com/fos4X-GmbH-600618833291489/https://www.youtube.com/user/fos4X

fos4Blade Research&Development

The perfect analysis tool for engineers to assess the mechanical performance of rotor blades.

The fos4Blade Reasearch&Development measurement system is successfully utilized by several blade manufacturers. The system is usually optimized according to the customer‘s needs in order to gather essential information about existing as well as newly designed rotor blades.

fos4X is enthusiastic about wind energy applications and is eager to support you with the setup, integration, installation and com-missioning of your fos4Blade Research&Development system.

If you want to find out more about the functionality, integration, installation and commissioning visit us at www.fos4x.de/produkte/windprodukte/fos4BladeR&D

Edge and flapwise vibration analysis

edge-wise

flap-wise

Blade VibrationVibration AnalysisThe vibration analysis of a rotor blade is done using fiber optic acceleration sensors fos4Acc at different positions within the blade. Valuable information about the blade’s mechanical performance can be derived from the gathered data and a subsequent eigenfrequency analysis. This enables several interesting applications like ice detection, health monitoring and many more.

The gathered data is used to:+ Validation of the vibration characteristics+ Determination of eigenfrequencies+ Continuous data analysis over the blade’s entire lifetime

Measurement of Bending MomentsIn order to enable the measurement of bending moments at several cross section of a rotor blade, four strain sensors fos4Strain expert are applied at every desired radius.

The calibration can either be conducted at a test facility or later at the turbine. The fiber optic working principle allows to reliably determine flap and edgewise bending moments over the blade’s entire lifetime.

The gathered data is used to:+ Validation of theoretical models+ Evaluation of bending characteristics+ Flutter and imbalance recognition+ Continuous data analysis over the blade’s entire lifetime

Moment Edge Blade 1

Edge-wise bending moment at radius 35 m (green), 45 m (red) and 60 m (blue)

Dynamic TorsionThe torsion sensor fos4Twist (prototype) is able to measure the torsion angle at several cross sections of a rotor blade. Innovative fiber optic technology enables lightning-resistant twist measurements up to the tip of the blade.

The gathered data is used to:+ Validation of theoretical models+ Improved control of pitch angle+ Gathering data of correlated bending and torsion effects

Blade Angle during operation

Blade Angle

CERTIFICATE NO. TC-GL-013A-2014

Function: + User Interfaces and databases for continuous analysis+ Complication-free implementation of new functions (plugins) and new

applications as well as custom algorithms

Developed for:+ Fusion of gathered data

of mulitple sensors+ State of the art data analysis+ Machine control

Existing Plugins:+ Ice Detection+ Bending moment calculation+ Structural health monitoring

fos4Blade IceDetection

Ice accretion leads, due to the increased mass of the blade, to changes in the vibrational finger print of a rotor blade. These variations are reliably detected using the purely fiber optic fos4Acc 2D vibration sensors.

Whereas currently used systems estimate icing via instru-ments on the nacelle, the fos4Blade IceDetection system detects ice accumulation directly on the blade. This leads to a minimal down time with keeping maximal safety.

If you want to find out more about the functionality, integration, installation and commissioning visit us at www.fos4x.de/produkte/windprodukte/fos4BladeIceDetection

fos4Blade StructuralHealthMonitoring

If rotor blades are damaged or weakend, a detectable shift in the eigenfrequencies occurs.

The fos4Blade StructuralHealthMonitoring system‘s high sensitivity allows the detection of minimal changes of the state of the blade. The system is therefore ideal for appli cations like early recognition of damage and overload protection.

If you want to find out more about the functionality, integration, installation and commissioning visit us at www.fos4x.de/produkte/windprodukte/fos4BladeStructuralHealthMonitoring

fos4Blade LoadMonitoring

The real-time measurement of the in-situ load of a rotor blade opens up a completely new field of possibilities for sophisticated control strategies, optimized turbine operation and many more other applications.

The fos4Blade LoadMonitoring system offers reliable and high-available blade root load measurements and is ready to be integrated in all turbine types of every manufacturer.

If you want to find out more about the functionality, integration, installation and commissioning visit us at www.fos4x.de/produkte/windprodukte/fos4BladeLoadMonitoring Schematic representation of the functionality of individual pitch control to

reduce lateral excitation

Individual Pitch Control

Innovative Fiber Bragg Grating (FBG) measurement technology

Fiber Bragg Gratings are interference filters incsribed into fiber optic cables that are able to translate mechanical strain into a shift in the reflected wavelength.

+ The reflected wavelength changes relative to the strain at the optical fiber.

+ The fiber typically has a diameter of 250 µm+ The length of a FBG sensor is 3 – 8 mm+ FBG sensors are insusceptible to electromagnetic interference

fos4X revolutionized fiber optic measure- ment technology with a groundbreaking patent over 10 years ago. Fiber optic strain, temperature and acceleration sensors can withstand over 1000 times more load cycles than comparable electrical sensors.

Measuring signal

“White” Light

ε

Strain

Fiber-Bragg-Grating

Fiber optic measurement technology therefore offers perfect solutions for many areas and applications such as process control, test benches, structure monitoring, prototype testing and many more…

If you want to find out more about fiber optic measurement technology visit us at www.fos4x.de

Data analysis and algorithms

Step IData aquisition

fos4Strain

fos4Temp

fos4Acc

Step IIData processing

Optional Data of WEC

Bending

Vibration Ice Detection

Structural HealthMonitoring

Overload Protection

Eigenfrequency Analysis

Active LoadReduction

Step IIIComputation

Pitch Angle

Rotor Speed

Calibration

Step IVThreshold analysis

Ice?Damage?Overload?

fos4Test & Cabinet

Standard Interface

industrial fiber optic measurement

CERTIFICATE NO. TC-GL-013A-2014

fos4X Thalkirchner Str. 210, DE, 81371 München, T: +49 89 99 95 42-00, Email: info@fos4X.de

fos4Blade StructuralHealthMonitoring

+ Online monitoring of rotor blade condition+ Detecion of typical blade failures+ Available as retrofit solution for different types

of wind turbines

fos4Blade LoadMonitoring

+ Reliable measurement of load at the root of the blade+ Suitable for active load control + Life time estimations

Cabinet

+ Protection of measurement equipment against lightning, humidity, salty fog and thermal impact+ Stainless steel cabinet suitable for wind turbine applications+ 110 V or 230 V (AC) or 24 V (DC) power supply+ Extended temperature range (-40°C to 65°C)+ Wireless interface available

Break-Out-Box

+ Box for joining optical cables+ Mounted at bulk of the blade+ IP65, offshore capability

fos4Test dyn

+ Fiber-optic measurement device for dynamic measurements

+ Up to 50 kHz sampling rate + Standardized measurement in accordance with

IEC 61400-13

Blade Hub Connection

+ Connection between bulkhead and hub in order to reliably transmit optical data+ Suitbable for pitch angles from ± 540°+ In compliance with industry specific HSE regulations

fos4Blade Research&Development

+ Platform to gather all relevant mechanical rotor blade loads

+ Customer specific measurement system setup+ Qualification of simulation models, distributed blade

load measurements, flutter and mass imbalance recognition, overload protection

fos4Blade IceDetection

+ Certified by DNV-GL+ Precise ice detection (Minimum 10 kg)+ Resumes operation automatically when ice-free+ Available as retrofit solution for different types

of wind turbines

fos4Twist

+ Dynamic and total torsion angle from hub to tip of the blade

+ Measurement at any radius+ Measurement range ± 30°

fos4Strain

+ Fiber-optic strain sensor insusceptible to electro-magnetic interference

+ Longer Life-cycles and larger measurement range than conventional strain sensors (>>108 Load cycles

at 0,2 % strain)+ Athermal design+ Very compact design available

Data processing capabilities

+ Realtime data processing (for control systems)+ Framework for customer specific algorithms+ Webserver for configuration and visualization+ Internal SSD storage (up to 1TB)+ WIFI bridge for connectivity between nacelle and hub

fos4Test nSens

+ Fiber-optic measurement device for distributedmeasurements

+ With the ability to measure up to 72 sensors per device+ Up to 100 Hz sampling rate per sensor

fos4Temp

+ Fiber-optic temperature sensor insusceptible toelectromagnetic interference

+ Temperature range -40°C to 600°C

fos4Acc

+ Fiber-optic acceleration sensor insusceptible to electromagnetic interference+ Enables 3D accelerations measurements at the tip of the blade+ Suitable for vibration analyses+ Very compact design available

Possible Interfaces

+ Ethernet+ CAN & CANopen+ PROFINET+ Modbus TCP/IP+ Fast implementation of customer specific interfaces