High-multiplexing interrogator

The WIDE Spectra is a multi-wavelength spectrum analyzer, with high spectral resolution and wide measurement bands. This compact and robust device coupled with a SLED source is a new FBG interrogator solution offering high multiplexing and high sensitivity possibilities in a very compact package.

SPECIFICATIONS
Parameter Performance with WIDE Spectra
Variation detected 0.2 pm : typ. 0.02°C, 0.2 µε
Number of FBG sensors up to 50 FBG (for ± 100°C or ± 1000 µε)
Dynamic 10 – 20 dB
Spectral range up to 100 nm centered at 850 nm
Absolute Accuracy +/- 10 pm
Input / Polarization PM singlemode fiber input
Speed 10 Hz
Number of inputs 1 – evolution to 4
Stability / repeatibility < 20 pm on long-term (evolution to < 3 pm), with T° variation (0-50°C)
Working temperature 10 – 40 °C

Reference:
F. Thomas ; M. De Mengin ; C. Duchemin ; E. Le Coarer et al., “High-performance high-speed spectrum analysis of laser sources with SWIFTS technology”, Proc. SPIE 8992, Photonic Instrumentation Engineering, 89920I (March 8, 2014); doi:10.1117/12.2039810.

Key features

  • Accuracy (high-sensitivity)
  • Robustness (ultra-compact, steady component)
  • Reliability (no-recalibration, die to die chip technology)
  • Cost effectiveness (high multiplexing capacity, equipment cost reduction, no maintenance)
  • Low-power, embeddable system for laboratory and in field conditions

Applications

Structural Health Monitoring (strain, temperature, pressure, vibration):

  • High-Multiplexing: up to 50 sensors with one single interrogator
  • High-Sensitivity: 0.02°C ; 0.2 µε (obtained with 0.1 nm FWHM FBG)
  • Wide Range: [0.1°C – > 1000 °C] in temperature ; [1 µε – 10 mε] in strain
  • Real-Time activity: 10 Hz

High-temperature measurement (T° > 1000°C):

  • Oil / Gas exploration and retrieval
  • High-temperature furnaces
  • Chemical processes
  • Motors / engines

FBG interrogator demonstration

High-resolution interrogator

The Grating Fabry–Perot Cavities (GFPC) are specifics FBG sensors that can provide very-high-sensitivity measurements in temperature and strain, when interrogated with the high-rate high-resolution ZOOM Spectra spectrometer.

SPECIFICATIONS
Parameter Performance with ZOOM Spectra
Variation detected typ. < 0.1 pm : i.e. < 0.01°C, < 0.1 µε
to < 0.01 pm : i.e. < 0.001°C, < 0.01 µε
Number of GFPC sensors 1 or 2 – evolution to 4
Dynamic 10 – 20 dB
Spectral range from 700 to 1100 nm – evolution to 1.5 µm
Absolute Accuracy +/- 10 pm
Input / Polarization singlemode PM fiber input
Speed 10 Hz – evolution to kHz
Number of inputs 1
Stability / repeatibility < 20 pm on long-term (evolution to < 3 pm), with T° variation (0-50°C)
Working temperature 10 – 40 °C
Power consumption < 10 W

Reference:
O. Coutant, M. De Mengin, and E. Le Coarer, “Fabry-Perot optical fiber strainmeter with an embeddable, low-power interrogation system,” Optica  2, 400-404 (2015). doi: 10.1364/OPTICA.2.000400

Key features

  • Accuracy (high-speed, very-high-sensitivity)
  • Robustness (compact, steady component)
  • Reliability (no-recalibration, die to die chip technology)
  • Low-power, embeddable system for laboratory and in field conditions
  • Possible discrimination of thermal and deformation effects

Applications

Structural Health Monitoring (strain, temperature, pressure, vibration):

  • High-speed : Hz – kHz
  • Very-High-sensitivity : < 0.01 °C, < 0.1 µε (obtained with Fiber Fabry-Perot Cavity (GFPC))
  • Ultra-High-sensitivity : < 0.001 °C, < 0.01 µε (evolution with Michelson-GFPC setup)
  • ide Range: [0.1°C – > 1000 °C] in temperature ; [1 µε – 10 mε] in strain

Microseismic monitoring:

  • Real-time activity
  • Ground micro displacement
  • Real-Time activity: 10 Hz ; evolution to kHz