Fiber Bragg Grating Type Linear Heat Detector
Product model:WT-FBG-9000
Product Description:
This system is a new generation of Fiber Bragg Grating (FBG) system which was independent designed by our company. It makes on-site non-electric monitoring come true by using optical signal during monitoring and transmission. FBG is a kind of new technology of temperature monitoring in modern industrial production. It overcomes the disadvantages of conventional detectors. The advantages are digital monitoring, high stability and long working life. Because of its non-conducting character, FBG is widely used in dangerous areas such as flammable and explosive area, high EMI place, corrosion area and high temperature environment.
Application Fields:
●On-line temperature monitoring in power & petrochemical industry.
●Security monitoring of offshore oil platform, pressure and temperature monitoring in oil well.
●Security monitoring of big structure, such as bridge, dam, steel structure, concrete construction,railway and mining etc.
●Temperature and strain monitoring in ship, aircraft and aerospace field.
Technical Principle:
Fiber Bragg Gratings are made by laterally exposing the core of a single-mode fiber to a periodic pattern of intense laser light. The exposure produces a permanent increase in the refractive index of the fiber’s core, creating a fixed index modulation according to the exposure pattern. This fixed index modulation is called a grating. At each periodic refraction change a small amount of light is reflected. All the reflected light signals combine coherently to one large reflection at a particular wavelength when the grating period is approximately half the input light’s wavelength. This is referred to as the Bragg condition, and the wavelength at which this reflection occurs is called the Bragg wavelength. Light signals at wavelengths other than the Bragg wavelength, which are not phase matched, are essentially transparent. Therefore, light propagates through the grating with negligible attenuation or signal variation. Only those wavelengths that satisfy the Bragg condition are affected and strongly back-reflected. The ability to accurately preset and maintain the grating wavelength is a fundamental feature and advantage of fiber Bragg gratings. The central wavelength of the reflected component satisfies the Bragg relation: λ = 2nA, with n the index of refraction and A the period of the index of refraction variation of the FBG. Due to the temperature and strain dependence of the parameters n and A, the wavelength of the reflected component will also change as function of temperature and/or strain. This dependency is well known what allows determining the temperature or strain from the reflected FBG wavelength.
Working Principle:
●Optical System
The broadband optical is transmitted to FBG sensors by optical splitter, the sensors reflect the optical according to particular wavelength, then it will be transmitted to optical-electric transfer module by optical splitter.
●Optical-electric transfer system
The optical wavelength signal is transferred in to electrical signal through optical-electric transfer system.
●Data collection and processing system
This system collects and processes electric signal from optical-electric transfer system, then transfers electric signal into digital signal and outputs such signal to the software through ethernet port or serial port.
●Software wavelength calculation and analysis system
Our company’s software is installed in the industry computer. Firstly, the central wavelength and spectrum is calculated through the software, then calculate the preset parameters of each sensor in the system, finally users will get the required physical quantity of the measured object.
Technical Parameters:
System connection diagram:
Application fields :
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