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Fiber Optic Temperature Sensors – Precise Temperature Measurement in Demanding Environments
Fiber optic temperature sensors use the physical properties of optical fibers to accurately detect temperature changes. They offer significant advantages over conventional electronic temperature sensors and are especially suited for demanding environments where high temperatures, electromagnetic interference (EMI), or explosion risks are present.
Unlike conventional sensors, fiber optic systems operate completely passively at the measurement point, making them immune to electromagnetic interference. This makes them ideal for applications in power generation, industrial automation, medical technology, as well as research and development. Fiber optic temperature sensors from Althen enable reliable and highly accurate measurements—even under extreme conditions.
How Fiber Optic Temperature Sensors Work
Fiber optic temperature sensors are based on the analysis of light signals within an optical fiber. Temperature changes affect specific properties of the light, such as:
- Wavelength
- Intensity
- Transit time
A commonly used measurement principle is based on Fiber Bragg Gratings (FBG) or other optical effects, where the reflected wavelength changes depending on temperature. The light signal is transmitted through the optical fiber, influenced at the sensing element, and then analyzed by an evaluation unit. The measured change is converted into a precise temperature value. Since no electrical voltage is present at the measurement point, these sensors are particularly safe and reliable in critical environments.
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Reliable measurement in EMI-critical and hazardous environmentsIdeal for applications where electrical sensors reach their limits.
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High precision even under extreme conditionsStable and accurate measurements at high temperatures and in challenging environments.
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Flexible multi-point measurement with a single fiberEfficient monitoring of multiple measurement points along a system.
Advantages of Fiber Optic Temperature Sensors
- Immune to electromagnetic interference (EMI)
Ideal for applications in high-voltage or EMI-critical environments. - Suitable for extreme temperatures
Fiber optic sensors can operate reliably even at very high temperatures. - High measurement accuracy and stability
Precise and low-drift measurements over long periods. - Electrically passive and intrinsically safe
No electrical energy at the measurement point – ideal for hazardous areas. - Multiplexing capability
Multiple measurement points can be implemented along a single fiber.
Typical Applications
Fiber optic temperature sensors are used in a wide range of demanding applications:
- Power generation and high-voltage systems
- Oil and gas industry (hazardous areas)
- Industrial automation and process monitoring
- Temperature monitoring in transformers and generators
- Medical technology (e.g., MRI environments)
- Aerospace
- Research and development
- Structural and condition monitoring
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How to Choose the Right Fiber Optic Temperature Sensor
Selecting the right sensor depends on several key factors:
- Temperature range
The sensor must be designed to withstand the maximum operating temperatures. - Measurement accuracy and resolution
High-resolution systems are required for precise applications. - Number of measurement points
Depending on the application, multiple sensing points may be needed along a single fiber. - Environmental conditions
Factors such as pressure, chemical exposure, or mechanical stress must be considered. - System integration
The right interrogation unit and interfaces are essential for seamless integration into existing systems.
Our experts are happy to support you in selecting the right fiber optic temperature sensor for your application – contact us!