OTG-M360: GaAs-Based Fiber Optic Temperature Sensor

The OTG-M Series of fiber optic temperature sensors from OpSens (OTG-M170, OTG-M220, OTG-M360, OTG-M420, OTG-M600, OTG-MPK5, and OTG-MPK8) delivers exceptional performance. The OTG-M Series sensors employ a tried-and-tested method of temperature transduction based on the temperature-dependent bandgap of Gallium Arsinide (GaAs) crystal.

This sensor type is practical for tip measurement applications because of the minicule GaAs crystal positioned at the tip of an optical fiber. The response time and the sensor’s diameter (OD) are what make each model of the OTG-M series unique.

The OTG-M Series provides unprecedented repeatability and reliability in the toughest conditions, such as high levels of EM, RF, MR, and microwave field environments, when combined with OpSens' SCBG signal conditioning technology and the benefits of measuring using light.

The OTG-M Series is manufactured using optical fiber that is industry standard and works with all SCBG signal conditioners from OpSens. This small and dependable fiber optic temperature sensor may be customized for OEM or customer-specific applications and comes with a variety of optical cables and sheath choices.

Key Features

  • Immune to EMI, RFI, MRI, and microwave radiation
  • Robust and compact design with exceptional repeatability
  • OEM and customized versions
  • Good precision
  • Intrinsically secure


  • Monitoring of temperature changes
  • Disposable sensor, inexpensive
  • Applications that need compact sensors
  • High-voltage surroundings
  • Microwave, RF, and EM settings

OTG-M Series

Fiber Optic Temperature Sensor

OTG-M360: GaAs-Based Fiber Optic Temperature Sensor

Image Credit: OpSens Medical


Source: OpSens Medical

Sensor model OTG-M170 OTG-M220 OTG-M360 OTG-M420 OTG-M600 OTG-MPK5 OTG-MPK8
Response time ≤35 ms ≤50 ms <100 ms <200 ms 200 ms <225 ms <500 ms
Sensor diameter 0.170
Sensor tip material (Tube) Bare fiber Polyimide Glass Polyimide Polyimide PEEK PEEK
Temperature operating and calibrated range -40 °C to +250 °C (other ranges available upon request)
Accuracy ±0.8 °C or better for other temperature range
Operating humidity range 0-100%
EMI/RFI Susceptibility Complete immunity
Calibration NIST traceable
Cable length 1.5 meters standard (other lengths available)
Optical connector LCA, ST, standard
Cable sheathing TeflonTM
Signal conditioner compatibility All Opsens Solutions GaAs (SCBG) signal conditioners

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