OTG-M170 Fiber Optic Temperature Sensor

GaAs-Based Fiber Optic Temperature Sensor for Tip Measurement Applications

OpSens’ OTG-M170 fiber optic temperature sensor offers the smallest optical temperature sensor in the industry. The OTG-M170 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’ GaAs signal conditioning technology and with the inherent advantages of fiber optic, the OTG-M170 delivers unprecedented repeatability and reliability in the most adverse conditions such as high level of EM, RF, MR, NMR and microwave field environments.

The OTG-M170 is made with industry standard optical fiber and is compatible with all OpSens’ GaAs 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


  • Fastest response time
    Smallest and robust design
  • Good accuracy and outstanding repeatability
  • MRI (<1.5T)/EMI/RFI and microwave immune
  • Intrinsically safe
  • OEM-type and custom version


  • Catheter designs
  • RF, ultrasound and electro surgery environments
  • Temperature monitoring for preclinical and research applications
  • Surface and core temperature monitoring in MRI environments

Ordering Information

Ref / Catalog Number Order Number (GTIN) Description
Typical temperature operating range20 °C to +45 °C (higher temperature ranges available upon request)
Resolution0.01 °C
Accuracy± 0.3 °C (Total accuracy over the full range from 20 to 45 °C including both signal conditioner and sensor errors)
± 0.8 °C and better (Total accuracy over the full range higher than 45 °C including both signal conditioner and sensor errors)
Response time10 ms or better
Operating humidity range0-100 %
MRI(/EMI/RFI susceptibilityComplete immunity (MR field <1.5T)
CalibrationNIST traceable
Cable length1.5 meters standard (other lengths available)
Optical connectorST standard
Cable sheathingTeflon™ ( ≥ 85 °C)
Signal conditioner compatibilityAll Opsens GaAs signal conditioners

All specifications are subject to change without prior notifications

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