With level of protection IP54
Interrogation monitor (FBG) 

FBG interrogation monitor with level of protection IP54


The FBG interrogation unit FIU – 44 – 1.55 with level of protection IP54 (dustproof and waterproof) provides registration of optical signals from fiber-optic sensors for various physical quantities based on Fiber Bragg Gratings (FBGs).

The obvious advantage FIU is constantly processing a reference signal, which leads to constant monitoring of the accuracy of the measurements.





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** 4 / 8/ 16 
The number of sensors per channel 16 (8)
Range of intensities of the registered optical signals, dBm -80 ÷ -20
Dynamic range, dB 30
Total optical power light source, dBm*** 0
Sampling frequency, kHz  4 (8)
Software The FBG interrogator is equipped with a built-in fully functional software
Output interfaces  USB 2/0, SVGA, RS232****, RS485****
Power consumption, W  < 200 
Protection class IEC 60529 IP54
Working temperature range, ºС +5 ÷ +45
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.

**** – on the request


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.