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FBG Sensors

Being a type of fiber optic sensor, FBG sensor has all the advantages usually attributed to optical fiber sensors, such as low loss relative to the fiber length, immunity to electromagnetic and radio frequency interference, small size and weight, intrinsically safe operation in environments characterized by hazardous materials, high sensitivity and long-term reliability. In addition, fiber Bragg grating technology reveals an inherent serial multiplexing capacity and an ability to provide absolute measurements without the need for referencing. This makes it a natural alternative to conventional electrical sensing technologies.

FBG Optical Bragg Grating Sensors

FBG optical sensors can be deployed in harsh environments including high temperature, high radiation, high vacuum, high pressure, and low-temperature, such as power transformer, switch cabinet and other power equipment hot spot monitoring; high-power generator vibration and temperature monitoring; wind blade monitoring; aircraft fuel tank stress monitoring; thermal nuclear reactor strain, temperature, and displacement monitoring; spacecraft monitoring and so on. As a professional fiber Bragg grating manufacturer, T&S can provide you with high-quality FBG sensors at reasonable prices, our production line includes FBG strain sensor, FBG temperature sensor, fiber bragg grating pressure sensor, etc. T&S provides FBG sensors at the best FBG sensor price, Please feel free to leave us a message.

FBG Strain Sensor (S03)
  • Fiber Bragg Grating strain sensor S03 S04 used in embedded concrete structure slope

  • Dam health monitoring, strain measurement micro-vibration

  • Deformation measurement range 5000 micro

  • Strain accuracy 5 micro

  • Strain can be customized with temperature compensation

FBG Strain Sensor (S03)
FBG Temperature Sensor (T04)
  • Fiber Bragg Grating Temperature sensor t09 fiber Bragg grating temperature sensor string T10 fiber Bragg grating temperature sensor T14 for oil-immersed transformer

FBG Temperature Sensor (T04)
FBG Pressure Sensor (P02)
  • Fiber Bragg Grating pressure sensor measuring range of 70kN oil-immersed transformer winding clamping force measurement/installed at the pressure shoe position

FBG Pressure Sensor (P02)
FBG Vibration Sensor (V01)
  • Fiber Bragg Grating vibration sensor

  • Free from electromagnetic interference

  • Excellent insulation performance

  • Good amplitude-frequency characteristic curve

  • High measurement frequency dc-500hz

  • Easy to install

FBG Vibration Sensor (V01)

FBG Optical Sensors Classification

FBG strain sensor works similarly to the temperature sensor. The wavelength responds to the applied strain. These Fiber-optic Bragg Grating sensors are spot-welded directly to the surface of the metal structure with a protective silicone cover.

• Temperature sensors reflect wavelengths shifts in response to temperature alters. Temperature sensors are protected by a small-sized steel housing, and this type of FBG sensor can be easily installed in any structure or material like concrete and the like.

• Pressure sensors measure the relative pressure or level of liquids and gasses in confined tubes, tanks, vessels, and pipelines.

• Displacement sensor measures the deformation magnitude of various structures. These Fiber Bragg Grating sensors are usually fixed on the structure surface, to measure distance change between two anchor points.

• Vibration sensor also known as the accelerator is a sensor tailored to measure acceleration at different frequencies, which measures structural vibration in most applicable cases. The vibration sensor combines compact size and high resistance to corrosion and harsh environments with long-term reliability.

• Also, there are tiltmeter and load/weight sensors that perform based on FBG technology.

FBG Sensor Working Principle

FBG sensor technology is applied to products based on sophisticated physics and technology. Laser light travels through a fiber core in an exact defined manner. Bragg grating is photolithographed onto the core of a piece of optical fiber and reflections of this grating create a stable sensor. Changes in strain, pressure, temperature, vibration, acceleration, etc. over the fiber will cause a wavelength shift and reflections magnitude change. This change allows very accurate measurements to be attainable either over a long period of time or in super-fast cases.

The Fiber Bragg Grating pressure sensor takes FBG as the sensing element. FBG is highly responsive not only to mechanical deformation but also to temperature changes.

When the light beam travels towards a fiber Bragg grating structure, only the specific wavelength of light is reflected by the refractive index. This wavelength is the so-called Bragg wavelength, and this is actually what makes fiber optic Bragg grating transmit most of the light whilst reflecting a certain wavelength.

FBG pressure sensor can be installed far away from the interrogators, which applies to the quasi-distributed system based on FBG, as well as to any distributed systems, however, the FBG temperature sensor normally has a very fast reply and low heat retention. They require no power supply, grounding, and galvanic isolation, and it functions perfectly under bad climatic conditions and harsh environments.

FBG Optical Bragg Grating Sensors FAQs

Where can FBG temperature sensors be used?

Due to its good insulation performance, explosion-proof, waterproof and anti-electromagnetic interference ability, FBG temperature sensors is especially suitable for complex applications such as humidity, high voltage, oil and so on.

Does the FBG sensor need maintenance after installation?

After the installation and debugging of the sensor FBG, no additional maintenance is needed. You will only need to protect the FBG pressure sensors from damage and fracture.

Optical Strain Gauge - How Does It Work?

Though mainly used to measure strain, the fiber Bragg grating pressure sensor can actually be integrated into different types of transducers. It can effectively conduct the functions of measuring temperature, acceleration, or displacement. In comparison with the traditional electrical strain gauges, the sensor FBG does not need any electricity. Working on the basis of the light that propagates through a fiber, the FBG pressure sensors are completely passive and immune. However, it should be noted that normally, the FBG sensors are extremely susceptible to temperature. The fiber will expand when the temperature rises and contract when the temperature drops. Thus, it is important to make sure temperature compensation towards the sensor FBG is well done during its working time.

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