FBG Sensors

Fiber Bragg Grating (FBG) sensors have been used for years in many demanding harsh environment applications as an alternative to traditional electrical and mechanical sensors. Generally, FBG sensors offer higher accuracy, longer stability, smaller size, immunity to electromagnetic interference (EMI) and the ability to measure ultra-high speed events.

FBG sensor technology relies on some sophisticated technology and physics. Laser light travels through a fiber core in a very defined manner. A Bragg grating is introduced onto the core of a fiber and the many reflections off of this grating create a stable sensor. Any strain (temperature, pressure, vibration, etc.), applied to the fiber Bragg grating into the fiber will cause a wavelength shift and magnitude change of the reflections. This change allows for very accurate measurements to be performed either over a long period of time or in an ultra-fast event.

Fiber Bragg grating sensors use an FBG as a sensing element. FBG is highly responsive not only to mechanical deformation but also to temperature changes. When the light beam travels towards the fiber Bragg grating, but the only specific wavelength of light is reflected by the refractive index, this wavelength is called Bragg wavelength. Essentially, this is what causes fiber optic Bragg grating to transmit most of the light while reflecting only certain wavelength.

The sensor may be located far away from the interrogating device (tens of kilometers), which applies to the quasi-distributed system based on FBG, as well as to any distributed systems, however, they have a very fast reply and low heat retention. It doesn't require a power supply, grounding, and galvanic isolation, and it functions perfectly well under adverse climatic conditions and aggressive environment.

Fiber optic system has complete fire and explosion safety, it can’t hit with the electrical shock, and it doesn’t emit radio waves.

Optromix provides a wide range of sensors:

Temperature sensors are a fiber Bragg grating sensors, which reflected wavelengths shifts in response to temperature changes. Temperature sensors are protected by a small-sized steel casing. It can be easily placed in any structure or material (including concrete).

Strain sensors operate very similarly to the temperature sensors, the wavelength responds to the applied strain. The sensors are welded directly to the surface of the metal structure (pipes, beams, etc.), and it has a protective silicone cover.

Displacement sensor measures structural deformation estimation using the strain data. Sensor is installed on the structure surface, and it measures the distance between two anchor points. It can be used in a combination with additional components to determine soil displacement.

Tiltmeter can be used for monitoring of the constructions inclination (tower buildings, mine shafts). The sensor is equipped with thermal compensation sensors and self-calibration system.

Accelerometer can be used in a wide range of monitoring applications including the vibration measurement of building structures, turbines, laboratory tests.

Pressure sensors measure the relative pressure or level of liquids and gasses in a variety of vessels and pipelines. It can be used in piezometers, for indirect control of flow and liquid level in tanks and pipes.

Load/Weight sensor can be used for measuring the load applied to various surfaces and structures. It is located between the two interacting surfaces. It is equipped with thermal compensation sensor.

If you would like to purchase FBG (Fiber Bragg Gratings) sensors, please contact us: or +1 617 558 98 58