GaAs fiber optic temperature sensor GaAs package temperature sensor
quartz glass fiber conduction
Gallium arsenide optical fiber temperature sensor is an optical
fiber temperature sensor made of gallium arsenide as a temperature
sensing substance. The crystal and quartz glass are encapsulated by
using the temperature-related characteristics of the optical band
gap change of gallium arsenide semiconductor material, which uses
light as the medium and quartz glass fiber as the conduction
medium. The sensor has no conductor structure, complete immunity to
electromagnetic interference, good repeatability, high precision,
fast response and long life. It can be used in areas with strict
requirements for life and anti-interference, such as RFI,
EMI,NMR,RF, microwave, ultra-high voltage equipment and other
environments.
Working principle
The GaAS optical fiber temperature sensor is based on the optical
properties of GaAs semiconductor materials, and its core is the
principle that the absorption characteristics of GaAs crystals for
specific wavelengths of light change with temperature. When the
light source emits multi-wavelength light incident on the gallium
arsenide crystal, the crystal absorbs different wavelengths of
light at different temperatures, and the unabsorbed wavelengths of
light will be reflected back to the device. By analyzing the
reflection spectrum, the temperature parameters at the probe can be
calculated. This measurement method based on spectral absorption
changes avoids the need for field calibration and improves
versatility and accuracy.
Technical specifications
| Temperature measurement range: | -20℃~200℃ |
| Fiber optic Connector Type: | ST (custom accepted) |
| Minimum bending radius: | 30mm |
| Length requirements: | The cable length below 1000 m does not affect the temperature
measurement performance |
| Optical cable withstand temperature: | -100℃~250℃ |
| Sheath material: | PEEK |
| Electromagnetic interference: | Complete immunity |
| Cable tension: | 50N/15s |
| Tension between sensor body and outgoing cable: | 20N/15s |
| Fiber cable tensile strength: | 100Mpa |
| Cable bending strength: | 165Mpa |
| Optical cable compression strength: | 125Mpa |
| Sheath hardness: | D85 (Shaw) |
| Optical cable dielectric strength: | 23kV/mm |
Characteristic
1. Conductor less structure: Gallium arsenide fiber optic
temperature sensor adopts conductor less design, completely immune
to electromagnetic interference, suitable for strong
electromagnetic environment.
2. High precision and fast response: the temperature measurement
accuracy can reach ±1℃, the response time is less than 0.25
seconds, suitable for real-time monitoring.
3. Long-distance transmission capacity: the fiber length can reach
more than 1000 meters, does not affect the temperature measurement
performance, suitable for remote monitoring.
4. Strong anti-interference ability: The sensor performs well in
the environment of high voltage and strong electromagnetic
interference, and is suitable for complex environments such as RFI,
EMI, NMR, RF and microwave.
5. Long service life: The sensor has high stability and life span
of more than 30 years, which is suitable for long-term online
monitoring.
Strong adaptability: can be used in corrosive liquids, vacuum
environment and high temperature and pressure scenarios.
Application
- Power system: used to monitor the temperature of key equipment
such as circuit breakers, transformers, cables, bus switches, etc.,
to achieve fault warning and ensure the safe operation of
equipment.
- Industrial equipment: such as hydraulic turbines, thermal power
plants stator pressure finger and collector ring temperature
measurement, and vacuum drying process oil immersed transformer
internal hot spot monitoring.
- Nuclear magnetic resonance (NMR) and RF environments: Due to its
anti-electromagnetic interference properties, it is widely used in
nuclear magnetic resonance, RF and microwave equipment.
- Special environmental monitoring: such as corrosive liquid
environment, vacuum environment and temperature measurement under
high temperature and high pressure scenarios.
- Other fields: such as tunnel crack detection, earthquake
monitoring, etc.
Q&A
