OptiMet by HBM™

Product Description

Intrinsic sensors ensure efficiency and reliable measurement

OptiMet by HBMWhen the optical fiber itself forms the sensor element and, in addition, is used for transmitting measurement data, we speak of an intrinsic, fiber-optic sensor.In specific applications, fiber Bragg grating-based strain gages are superior to their electrical equivalents. HBM has completed its range of electrical and optical strain gages with the OptiMet by HBM™ system of fiber-optic components with and without integrated Bragg grating measurement function.

The OptiMet systems offers singlemode optical fibers with integrated functional grids:

  • OptiMet-OMF (Ormocer fiber)
  • OptiMet-PKF (Coated fiber)

And, in addition, passive components offering useful features:

  • OptiMet-TMF (Patch cable, standard telecommunications fiber)
  • OptiMet-LAF (Low attenuation fiber)

Whether in aerospace, geotechnology or pipeline monitoring – efficiency and reliability are guaranteed!

Applications

Fields of application:

  • Experimental Stress Analysis and Durability Testing
  • Aerospace Testing
  • Automotive Testing
  • Railway Testing
  • Geotechnology

Potential applications:

  • Monitoring of slopes
  • Monitoring of the settling in pipelines
  • Monitoring during the construction phase (tunnel convergence, elevation, etc.)
  • Determining of static and dynamic states of loading

Advantages over electrical strain gages

  • Faster and more cost-efficient installation per measuring point
  • Insensitivity to the influences of ambient humidity and water
  • Enhanced stability against alternating load
  • Better utilization of the testing system, no downtimes resulting from the replacement of electrical strain gages
  • Tested for high strain up to and over 7000µm/m.

 

Configuration and Properties

Figure 1 shows a typical measuring chain configuration. Fig. 1: Typical configuration for OptiMet OMF and OptiMet PKFFigures 2, 3 and 4 show OMF and PKF fiber types, each with distinguishing features. The two OptiMet types have the same optical properties:

  • a) Peak form (grid with low reflection characteristics and maximal 15% reflectivity)

Fig. 2: Typical peak form of Bragg gratings in OptiMet OMF and OptiMet PKF fibers

  • b) Gage factor: 0.79
  • c) Core diameter: 6µm @ 1550nm
  • d) Attenuation: 18 dB / km (bidirectional

The two fiber types are characterized by high stability against alternating load and the capability to absorb high levels of strain. OptiMet OMF (195µm fiber diameter):

Fig. 3: OptiMet OMF singlemode fiber OptiMet PKF (700µm fiber diameter): Fig. 4: OptiMet PKF singlemode fiber

 

Operating temperature range

The operating temperature range* for the types is:

OptiMet OMF
OptiMet PKF
-269 to 200 °C -40°C to +100 °C
for a short time up to +300 °C for a short time up to +300 °C

 

*The characteristics of the adhesives used in the installation have not been taken into account