OTG-A Fiber Optic Temperature Sensor

GaAs-based fiber optic temperature sensor for R&D and industrial applications.

Opsens Solutions’ OTG-A fiber optic temperature sensor offers the highest performances in the industry. The OTG-A sensor uses the well proven technique based on the temperature-dependent bandgap of GaAs crystal as the temperature transduction mechanism. Its small sensing GaAs crystal located at the tip of the optical fiber makes it convenient for tip measurement applications.

Combined with Opsens Solutions’ SCBG (Semiconductor Bandgap) signal conditioning technology and with the inherent advantages of fiber optic, the OTG-A delivers unprecedented repeatability and reliability in the most adverse conditions such as high level of EM, RF, MR and microwave field environments.

The standard operating range of the OTG-A is from -40 °C to +250 °C. Higher temperature ranges up to 300 °C are available upon request.

The OTG-A is made with industry standard optical fiber and is compatible with all Opsens Solutions’ SCBG signal conditioners. This compact and robust fiber optic temperature sensor is available with different optical cables and sheath options and is customizable according to customer specific applications or for OEM-type applications.


  • Small and robust design
  • Good accuracy and outstanding repeatability
  • EMI/RFI and microwave immune
  • Intrinsically safe
  • OEM-type and custom version


  • EM, RF and microwave environments
  • High voltage environments
  • Microwave assisted chemistry
  • Sterilization applications
  • Nuclear & hazardous environments
  • In-situ process control
  • RF and microwave drying applications
Temperature Operating and Calibrated Range

-40 °C to +250 °C (Other ranges available upon request)


± 0.8 °C or better (Total accuracy over the full range including both signal conditioner and sensor errors)

Response Time

0.5 s typical (For faster response time, see the OTG-F product datasheet)

Operating Humidity Range

0-100 %

EMI/RFI Susceptibility

Complete immunity


NIST traceable

Cable Length

1.5 meters standard (Other lengths available)

Optical Connector

LCA, ST standard

Cable Sheathing

Teflon™ PTFE

Signal Conditioner Compatibility

All Opsens Solutions’ GaAs (SCBG) signal conditioners

Opsens Solutions Inc. reserves the right to make any changes to the above specifications without prior notice.

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