Design

OptiMet‐OMF glass fiber embedded in coating with 13 Bragg gratings

Core diameter of glass fiber, approx.

μm

6

Diameter of fiber cladding, approx.

μm

125

Outer diameter of OMF fiber, approx.

μm

195

Outer diameter with coating, approx.

μm

700 ±50

Connection (plug)

FC/APC

Available Bragg wavelengths

nm

1520 … 1580

Bragg wavelength spacing tolerance

nm

±1

Gauge factor

0.79

Gauge factor tolerance

%

±2

Reference temperature

°C

23

Operating temperature range

°C

-40 ¼ +140

Storage temperature range

°C

-40 ¼ +140

Thermal cross sensitivity (TCS)

thermal contribution of sensor to strain signal

μm/m/°C

7.1

Tolerance of thermal cross sensitivity (TCS)

μm/m/°C

±1

Maximum elongation

μm/m

7,000 (0.7%)

at reference temperature when using X120 adhesive

Strain in positive direction

Strain in negative direction

μm/m

7,000 (0.7%)

Fatigue life

at reference temperature when using X120 adhesive Achieved no. of load cycles Lw on steel measuring body at

alternating strain εw = +1000 μm/m and variation of zero point <30 μm/m

>> 107 (aborted after 107 load cycles)

Smallest bend radius at reference temperature

mm

10

Preferred bonding material 

X120