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MuST FBG Mono-Axial Accelerometer


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


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.


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 range0 … 50 Hz
Resonance frequency430 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 protectionIP65 (DIN EN 60529)
Attachment method 4)Bolted (M5)  4) anchors and screws not included
DimensionsØ53 x 73 mm
Weight338 g (with 2 m cable each side and no connectors)
Main materialsAluminum, stainless steel, ormocer®
Bragg wavelengths1500nm … 1600nm (±0.5)
Fiber core, cladding and coating diameter8/125/195 µm
FWHM, reflectivity and side lobe suppression> 0.2 nm, 20±6%, > 7dB
Cable typeØ 3 mm armor (Hytrel, stainless steel spiral, Kevlar® stainless steel mesh and PE)
Cable bend radius> 10 mm
Cable length0 … 20±0.05 m (for cables longer than 2 m, a splice — Ø8x200mm — is included at 2m from the sensor)
Ordering Info
  • Wavelengths, Cable length, Connector type
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