Arrayed waveguide grating interrogator for fiber Bragg grating sensors: measurement and simulation

Koch, Jan; Angelmahr, Martin; Schade, Wolfgang

doi:10.1364/ao.51.007718

Cited by 18 publications

(6 citation statements)

References 8 publications

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“…The intensity signals transmitted from the microcontroller are processed by a personal computer in the analysis software in which the Subsequently, the intensities are used to interpolate the course of the AWG output signals with respect to the center wavelength of the light portion reflected by FBG. Finally, according to [37], the ratio between the difference of two adjacent channel intensities over their sum is calculated, as shown in Equation 1, where I i is the averaged intensity of channel i.…”

Section: Resultsmentioning

confidence: 99%

Development of a Polymeric Arrayed Waveguide Grating Interrogator for Fast and Precise Lithium-Ion Battery Status Monitoring

et al. 2019

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We present the manufacturing and utilization of an all-polymer arrayed waveguide grating (AWG) interacting with a fiber Bragg grating (FBG) for battery status monitoring on the example of a 40 Ah lithium-ion battery. The AWG is the main component of a novel low-cost approach for an optical interrogation unit to track the FBG peak wavelength by means of intensity changes monitored by a CMOS linear image sensor, read out by a Teensy 3.2 microcontroller. The AWG was manufactured using laser direct lithography as an all-polymer-system, whereas the FBG was produced by point-by-point femtosecond laser writing. Using this system, we continuously monitored the strain variation of a battery cell during low rate charge and discharge cycles over one month under constant climate conditions and compared the results to parallel readings of an optical spectrum analyzer with special attention to the influence of the relative air humidity. We found our low-cost interrogation unit is capable of precisely and reliably capturing the typical strain variation of a high energy pouch cell during cycling with a resolution of 1 pm and shows a humidity sensitivity of −12.8 pm per %RH.

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Section: Resultsmentioning

confidence: 99%

Development of a Polymeric Arrayed Waveguide Grating Interrogator for Fast and Precise Lithium-Ion Battery Status Monitoring

et al. 2019

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“…Therefore, a thermal 400 GHz polymer arrayed waveguide grating (AWG) chip (Fraunhofer HHI) is installed within the measurement system resulting in a possible sampling rate of 2.5 MHz for each single FBG sensor. The functional principle of this interrogation method was first presented by Sano and Yoshino in 2003 9 and is explained in detail in Koch et al 10 .…”

Section: Fbg Measurement Systemmentioning

confidence: 99%

Fiber Bragg grating sensors for steel wire monitoring in real-time

2014

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Steel wires are widely applied in industrial applications - in most cases as critical components fulfilling high safety requirements in harsh environments (e.g. dockside cranes). In this paper a technique for real-time monitoring of steel ropes applying optical strain sensors based on fiber Bragg gratings is presented. The optical sensors are integrated within the wire strand and replace the core. The strain transmission from the outer wires to the sensors is assured by the mechanical coupling between the optical fiber and the strand. The actual strain load and rope vibrations in the kilohertz range can be determined in real-time

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“…The interrogation systems for the above mentioned vector sensors usually require spectrometer devices for spectral demodulation. Though integrated spectrometers such as arrayed waveguide gratings have been developed as compact FBG interrogators [13], the extra optical components can still add to the system complexity and cost. The solution of using distributed Rayleigh scattering eliminates the need to write gratings along the fiber and offers extremely high measurement resolution, but the interrogation system requires often complicated and expensive demodulation schemes involving optical frequency domain reflector [14,15].…”

Section: Introductionmentioning

confidence: 99%

Fiber Vector Bend Sensor Based on Multimode Interference and Image Tapping

Zhang

Rahman

Fiebrandt

et al. 2019

Sensors

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A grating-less fiber vector bend sensor is demonstrated using a standard single mode fiber spliced to a multimode fiber as a multimode interference device. The ring-shaped light intensity distribution at the end of the multimode fiber is subject to a vector transition in response to the fiber bend. Instead of comprehensive imaging processing for the analysis, the image can be tapped out by a seven-core fiber spliced to the other end of the multimode fiber. The seven-core fiber is further guided to seven single mode fibers via a commercial fan-out device. By comparing the relative light intensities received at the seven outputs, both the bend radius and its direction can be determined. Experiment has shown that a slight bend displacement of 10 µm over a 1.2-cm-long multimode fiber in the X direction (bend angle of 0.382°) causes a distinctive power imbalance of 4.6 dB between two chosen outputs (numbered C4 and C7). For the same displacement in the Y direction, the power ratio between the previous two outputs C4 and C7 remains constant, while the imbalance between another pair (C3 and C4) rises significantly to 7.0 dB.

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Arrayed waveguide grating interrogator for fiber Bragg grating sensors: measurement and simulation

Cited by 18 publications

References 8 publications

Development of a Polymeric Arrayed Waveguide Grating Interrogator for Fast and Precise Lithium-Ion Battery Status Monitoring

Development of a Polymeric Arrayed Waveguide Grating Interrogator for Fast and Precise Lithium-Ion Battery Status Monitoring

Fiber Bragg grating sensors for steel wire monitoring in real-time

Fiber Vector Bend Sensor Based on Multimode Interference and Image Tapping

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