A cost-effective FBG (Fiber Bragg Grating) interrogation system that includes a tunable light source, and several fiber optic couplers
has been developed with a very simple configuration.
Especially, it is not necessary to compensate for the accurate wavelength because the wavelength sweeping is precisely performed
in terms of the response time of which external cavity material is 5 msec. Moreover, time-varying temperature trends as well as spectra
of FBGs can be observed through the front display.
Features
▶ Simplies the wavelength variable function by using the electric driving characteristics of the light source
(VCSEL)
▶ By using the adjustment of the bias current applied to the light source,
temperature accuracy equivalent to the conventional method is secured without expensive filters.
▶ Small operation possible with around 10 sensors
▶ Suitable for IoT optical sensor network configuration
Applications
▶ Sensor system using optical fiber such as chemistry and temperature
▶ Safety diagnosis and displacement measurement of structures, terrain, ships, power plants, etc
▶ IoT sensor monitoring
▶ Soil moisture sensor for Smartfarm
▶ Safety system in shipbuilding and power field
Application - Temperature Sensor
Application - Soil Moisture Sensor for Smartfarm
Specification
Optical Properties
| Temperature Range | -20 ~ 120 ℃ | Depend on coating material |
| Temperature Resolution | 0.5℃ | |
| Temperature Accuracy | 1℃ | Depend on data average |
| Max. Sampling Rate | 200Hz | |
| Number of FBG | 7 ~ 14 Sensors | Additional 1 Ref. Sensor |
Mechanical Properties
| Connector type | FC/APC | Depend on user’s requirement |
| User interface | USB 2.0 | Ethernet RS-232 Compatible |
| Dimension | 150mm X 225mm X 135mm | 150mm X 225mm X 135mm |