Description
The Temperature Chain TC-X01 is a spliceless chain of multiple high-precision fiber optic temperature sensors in series on a single fiber. The sensors are all contained in a 1mm stainless steel tube which is connectorised on one end using a pigtail. The TC-X01 can be configured according to customer needs i.e. the length of the tube, the number of sensing points and their spatial distribution can all be specified.
Features
• Distributed temperature sensing
• Fully configurable according to customer needs
• Single ended configuration
Specifications
| Parameter | Value |
| Temperature resolution1 | 0.1°C |
| Temperature precision1 | 3°C |
| Sensor temperature range2,3 | 0°C to +150°C * |
| Housing length | 100mm to 1000mm |
| Housing diameter | 1mm |
| Housing material | SS316 or SS310 |
| Housing hardness | 280 – 400 HV |
| Number of sensors | On request |
| Distance between sensors | On request |
| Connector type | FC/APC |
| Pigtail length2 | > 50 N (corresponds to > 5% strain) |
1 Using a depolarized measurement device with a 1 pm wavelenght resolution and precision.
2 Extendable on request.
3 For the sensor, not for the connector.
In the case of temperature sensing the Bragg wavelength is a function of the temperature. This temperature dependence results from changes of the refractive index of the fiber as well as from thermal expansion of the glass material. The use of Draw Tower Gratings (DTG®s) for temperature sensing enables several advantages compared to electrical sensors as well as to classical FBGs:
- Temperature measurements using FBGs is an absolute measurement. There is always a unique relationship between wavelength and temperature.
- FBGs have due to their small size and volume a fast temperature response time which is needed for the measurement of fast temperature changes.
- FBG based temperature sensors can become read out over large distances, without the need of amplification means under way (>20km).
- Due to the nature of the glass, FBG based temperature sensors show a good corrosion resistance.
- FBG based temperature sensors are immune to electromagnetic interference (even lightening interference)
- FBG based temperature sensors are intrinsically passive (no electrical power required) and therefore can be positioned in high voltage and potentially explosive atmosphere areas.
- Due to the low thermal conductivity of the lead-in fiber (glass), FBG based temperature sensors have no
significant influence on the distortion of the thermal distribution profile to be measured. - DTG® based temperature sensors can be used in series configuration with multiple gratings in a spliceless fiber (e.g. 80 sensors in 80 cm fiber) allowing to perform distributed measurements were the available space is limited.
- Ormocer® coated DTG®s can be applied in high temperature environments up to 200°C as well as in cryogenic environments, down to the liquid temperatures.
FBGS has developed a broad product portfolio of different temperature sensors based on Draw Tower Gratings. However, different other companies are also offering high reliable temperature sensors based on our DTG®s.
For more information, please contact us.
