FBG interrogation monitor for process control and registration of optical signals from the sensors

The FBG interrogation unit FIU - 44 - 1.55 up to 4 kHz

The FBG interrogation unit FIU - 44 - 1.55 up to 4 kHz provides registration of optical signals from unified sensor heads based on Fiber Bragg Gratings (FBGs) with a sampling frequency up to 4 kHz per second for one channel.

A distinctive feature of FIU for process control is the ability to interrogate the entire complex of fiber sensors with a sampling frequency of 400Hz.

Data processing and visualization can be performed either by the built-in computer with specialized software or be transmitted via the Modbus protocol to the user system

FIU was metrological tests in Russia. Approval certificate of measuring instruments RU.C.32.004.A  49372.


Measurable physical quantities:

By using various sensor head types, an FIU-based flexible multipurpose telemetry system can be constructed. Multipoint, quasi-distributed, or point simultaneous measurements can be implemented with such a system, the measurable physical quantities being as follows:


Technical characteristics




Spectral width of an optical channel, nm 1510 ÷ 1595 1525 ÷ 1595
Polarization state of the light source partially polarized depolarized
The number of optical channels 1 - 8
The number of sensors per channel 16
Range of intensities of the registered optical signals, dBm -80 ÷ -20
Dynamic range, dB 25
Total optical power light source, dBm*** 0
Sampling frequency for one channel, kHz  < 4
Processing time and outputting data of one channel, sec < 0,05
Software The FBG interrogator is equipped with a built-in fully functional software URM_Control
Output interfaces  USB 2.0, USB 3.0, Ethernet RJ45, SVGA, DVI-I, HDMI
Power consumption, W  < 250 
Protection class IEC 60529 IP40
Working temperature range, º +10 ÷ +40
Humidity, % (no condensation)  < 80
Power supply, V/Hz  220/50

* - the S-series of the FBG interrogation units have the partial polarization of the output radiation. As result it has greater measurement error when using fiber optic sensors.

** - sensor which consists of a single Bragg grating (FBG).

*** - on the request, up to 10dBm.


Advantages of the fiber-optic sensors:

  • high sensitivity and speed;
  • high immunity to noises and electromagnetic interferences, such as microwave and magnetic fields, spark discharge, and electromagnetic pulses of any nature and any intensity;
  • full electrical safety, which is due to the absence of electric circuits between the sensor and the registration module;
  • full explosion and fire safety, high chemical resistance of the sensing elements;


Areas of application:

  • energy production, including nuclear and thermonuclear installations;
  • aviation and cosmonautics;
  • land, water and underwater transport;
  • metallurgy and chemical industry;
  • oil and gas production;
  • pipeline transport;
  • construction;
  • medicine;
  • security systems;
  • scientific research.