For diagnostics and monitoring
Interrogation monitor (FBG)

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 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

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, ºС +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.

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