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Fiber optic temperature sensor 150 degrees Celsius

Optical network knowledge brief Published 11 Oct 2023

Prepared for preliminary research by the COETZER OPTICAL knowledge desk. Confirm compatibility, loss budgets and installation requirements against current standards and product documentation.

FBG-based fiber optic temperature sensors can reliably measure temperatures up to 150°C with high accuracy, fast response, and immunity to electromagnetic interference.Overview

Fiber optic temperature sensors, particularly those based on Fiber Bragg Gratings (FBGs), are designed for precise temperature monitoring in harsh environments. The OFSCN® 150°C low-voltage insulated FBG sensor can operate in temperature ranges from -200°C to 150°C, offering high sensitivity, fast thermal response, and excellent accuracy. These sensors are lightweight, corrosion-resistant, waterproof, and non-combustible, making them suitable for industrial, aerospace, power, and railway applications (OFSCN) .

Sensor Design and Features
  • Construction: Typically consists of a seamless stainless steel tube, insulation material, fiber connectors (FC, SC, LC, ST), and single-point or serial FBG encapsulation .
  • Temperature Sensing: The FBG reflects specific wavelengths of light that shift with temperature changes, allowing precise measurement.
  • Voltage and Safety: Low-voltage insulation ensures safe operation in high-voltage environments, with breakdown voltages of 600–6000 volts .
  • Installation: Can be inserted, clamped, adhered, or embedded into structures for single-point or quasi-distributed temperature monitoring .
Alternative Fiber Optic Sensors
  • GaAs Crystal Sensors: Use a Gallium Arsenide crystal at the fiber tip, providing immunity to electromagnetic interference and high-frequency radiation. Ideal for high-voltage or RF-intensive environments, these sensors offer fast, accurate measurements on small surfaces .
  • Distributed Fiber Optic Systems (DTSX): Enable continuous temperature monitoring over long distances and wide areas, suitable for predictive maintenance in factories or infrastructure. These systems detect temperature changes in real time and can identify the location of anomalies .
Advantages
  • Electromagnetic Immunity: Unlike thermocouples or RTDs, fiber optic sensors are immune to EMI/RFI, making them reliable in electrically noisy environments .
  • High Spatial Resolution: FBG arrays and distributed sensing allow sub-millimeter resolution and multipoint measurements along a single fiber .
  • Harsh Environment Compatibility: Resistant to moisture, corrosion, high pressure, and non-combustible, suitable for industrial and aerospace applications .
Applications
  • Industrial process monitoring
  • Power generation and electrical equipment
  • Aerospace and railway systems
  • High-voltage or RF-intensive environments
  • Embedded temperature monitoring in materials or battery systems
Summary

For temperature measurement up to 150°C, FBG-based fiber optic sensors provide a versatile, accurate, and safe solution. Depending on the application, you can choose single-point FBG sensors, serial FBG arrays, GaAs crystal tip sensors, or distributed fiber optic systems to achieve precise temperature monitoring in challenging environments. These sensors combine high sensitivity, fast response, and immunity to electromagnetic interference, making them ideal for industrial, aerospace, and high-voltage applications .

Fiber optic temperature sensor 150 degrees Celsius - COETZER OPTICAL SYSTEMS (Pty) Ltd [PDF]

Fiber optic temperature sensor 150 degrees Celsius

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