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MuST FBG Mono-Axial Accelerometer

Category: Geotechnical & Civil Engineering Instrumentats

FIBER OPTIC ACCELEROMETER

ROBUST AND EASY TO INSTALL

The single axis Accelerometer is a Fiber Bragg Grating (FBG) based sensor designed to measure acceleration at different frequencies from 0 to 50 Hz.

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The accelerometer is suitable for a large range of applications. This sensor is a fiber optic version of the conventional accelerometer but completely passive, offering inherent insensitivity to environmental induced noise

The accelerometer features high accuracy and resolution, and total fiber optic design ensuring intrinsic immunity to electric sparks and EMI/RFI.

The accelerometer can be used in a large range of monitoring applications, including measuring load induced vibration of civil structures. Connect two or three accelerometers at orthogonal directions for bi– or tri-axial acceleration measurements.

Compatible with most common FBG measurement units, the accelerometer combines compact size, high resistance to corrosion and harsh environments, and long-term reliability. It’s also suitable for remote sensing being possible to locate it several kilometers away from the measurement unit. It offers intrinsic multiplexing capability that allows the concatenation of a large number of sensors in a single optical fiber. This sensor is therefore particularly suitable for difficult-to-reach locations and large scale sensing networks.

 

Specifications

 

   Sensitivity                                                            59 pm/g (typical value measured at 40 Hz)
   Measuring range    ±10 g
   Resolution (time based measurement) 1)    17 mg  1) for 1 pm resolution in wavelength measurement
  Resolution (frequency based       measurement) 2)    1 mg  2) dynamic signals obtained with FFT analysis
   Frequency range    0 … 50 Hz
   Resonance frequency    430 Hz
    Flatness    < 2 %
   Transverse sensitivity    < 0.1 %
   Maximum calibration error     ±0.1 g (calibrated at 40 Hz. Typical traceability uncertainty of ±0.4 g(0-pk))
   Operation and storage temperature    -20 … +80 °C
   Temperature cross sensitivity 3)    < 0.37 g/°C  3)Temperature Cross Sensitivity (TCS) is the apparent acceleration induced by a 1°C   change in temperature
   Degree of protection     IP65 (DIN EN 60529)
    Attachment method 4)    Bolted (M5)  4) anchors and screws not included
    Dimensions    Ø53 x 73 mm
    Weight    338 g (with 2 m cable each side and no connectors)
   Main materials    Aluminum, stainless steel, ormocer®
   Bragg wavelengths    1500nm … 1600nm (±0.5)
   Fiber core, cladding and coating diameter    8/125/195 µm
   FWHM, reflectivity and side lobe  suppression    > 0.2 nm, 20±6%, > 7dB
   Cable type    Ø 3 mm armor (Hytrel, stainless steel spiral, Kevlar® stainless steel mesh and PE)
   Cable bend radius    > 10 mm
   Cable length    0 … 20±0.05 m (for cables longer than 2 m, a splice — Ø8x200mm — is included at 2m from the sensor)
   Connectors   E-2000

 

 

 

Ordering Info

  • Wavelengths, Cable length, Connector type