Applications

Early flame detections

Patent : Infrared Sensor GB10042150.8

Application

Early flame detection for use mainly in parkings, tunnels and wide infrastructures.

Technology

FBGs + Sensitive layer acting as blackbody,

Aluminium tube packaging including a capillary glass (greenhouse effect),

Temperature elevation measured by a shift of the Bragg wavelength.

Features

  • Response time less than 25 seconds,
  • Linear response without hysteresis,
  • Lower limit of detection ~ 1 kW/m2,
  • Reversibility,
  • Multiplexing capabilities,
  • Customized layout on request.

High temperature sensing

Application

Temperature measurements in various environments up to 1100 °C.

Technology

Specific FBGs (thermally regenerated or manufactured with femtosecond laser pulses) in different fiber types,

Adequate packaging,

Temperature elevation measured by a shift of the Bragg wavelength.

Features

  • Real time response,
  • Multiplexing capabilities,
  • Customized layout on request.

Railway traffic monitoring

Application

Axle counting,

Detection of speed, acceleration, weigh-in-motion, wheel flats.

Technology

Uniform FBGs,

High speed demodulation using CCD-based interrogators.

Features

  • Real-time response,
  • Multiplexing capabilities,
  • Customized packaging.

Environmental monitoring

Application

Sensing of chemical species in gas or aqueous environments.

Technology

FBGs and semiconductors combined with specific sensitive coatings.

Features

  • Response time less than a few tens of seconds,
  • PPM or PPB level detection depending on the application,
  • Selectivity and reversibility,
  • Multiplexing capabilities.

Strain monitoring

Application

Residual strain monitoring in different materials including concrete and composites during and after their manufacturing process,

Structural health monitoring + predictive maintenance.

Technology

Uniform FBGs in different fiber types,

Metrology based on spectral measurements, also with polarized light.

Features

  • Real-time response,
  • Selectivity (decorrelation of temperature effects),
  • Multiplexing capabilities,
  • Temperature compensation,
  • Customized connector development.

Smart textiles

Application

Integration of FBG sensors in textiles for various applications (temperature, strain, humidity, biomedical sensing, …).

Technology

Uniform and tilted FBGs in various fiber types with outer diameters down to 50 µm,

Compact interrogators.

Features

  • Real time response,
  • Multiplexing and multiparameter sensing capabilities,
  • Customized layout on request.

Condition monitoring

Application

Vibration sensing.

Technology

Uniform FBGs,

High-speed interrogators.

Features

  • Real time response and remote interrogation,
  • Multiplexing capabilities,
  • EM interference immunity,
  • Temperature compensation.

Biomedical sensors

Applications

Force sensing in tissues during surgery,

Biomarkers detection for real-time diagnosis.

Technology

Uniform and tilted FBGs,

Gold-coating and functional layer for biomarkers detection,

Customized packaging for use in endoscopy. 

Features

  • Real time response,
  • Multiplexing capabilities,
  • Specificity for a given target.

Hydrogen detection

Patent : Gas Sensor UK0707303.4

Application

Hydrogen detection around pipes, tanks, fuel cells or industries below the lower explosion threshold of 4 %.

Technology

FBGs + sensitive catalytic layer,

In the presence of H2 in air, the sensitive layer undergoes an exothermic reaction,

Temperature elevation measured by a shift of the Bragg wavelength.

Features

  • Response time less than a few seconds,
  • Linear response without hysteresis,
  • Lower limit of detection below 0.1%, whatever the temperature and relative humidity level,
  • Reversibility,
  • Selectivity (in particular, no response with CO and CH4),
  • Multiplexing capabilities,
  • Customized layout on request.