FBG* sensors that use optical fibers to enable the measurement of a variety of parameters *FBG : Fiber Bragg Grating Outline These sensors form a grat
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1 Fiber Bragg Grating Sensor Optical fiber sensor Pressure FBG sensors that use optical fibers to enable the measurement of a variety of parameters Temperature Acceleration
2 FBG* sensors that use optical fibers to enable the measurement of a variety of parameters *FBG : Fiber Bragg Grating Outline These sensors form a grating, which acts as the sensor unit, on optical fibers. Wavelength changes in light reflected off the grating are picked up by these sensors as changes in physical parameters. Measurement Principle - Several sensor elements can be installed in one fiber and independent measurement performed for each. - Moreover, several fibers can be connected in parallel in one system. Incident light Strain (1) Strain (2) Strain (3) Humidity Multi-axis Force Temperature Transmitted light Reflected light Circulator Multi-axis Force X-axis Y-axis The transmitted light is not used for measurement Light reflected by FBG (1), (2) and (3) The amount of is measured by measuring the changes of the reflected wave lengths 1, 2, and 3. Features Intrinsic safety explosion-proof performance Since light is used instead of electricity, there is no need to supply electricity to the sensor No fire hazard risk Long-distance transmission Transmission distance: From several km to several tens of km Multi-point measurement Noise resistance and stability Several sensor elements can be installed in one optical fiber Each sensor can perform measurement independently The sensors can be connected in parallel Since light is used, the sensor is not affected by electromagnetic waves or lightning Since the sensor is made of quartz glass, it provides excellent weather resistance Fiber Bragg Grating Sensor
3 Application Examples The FBG sensor can be used in a wide range of fields, and is currently attracting attention as a next-generation inspection and diagnostic system. Industrial Instrumentation Testing of Composite Materials Detection of Disasters Temperature, pressure and humidity measurement Monitoring and diagnosis of large-scale structures and aircraft Structural analysis and non-destructive testing Monitoring of earth pressure, water levels, debris flows and so forth Evaluation Testing in High-Voltage Conditions Industrial Instrumentation FBG sensors allow the measurement of and temperature in high-voltage conditions. Example of analysis for pantograph Example of temperature & measurement for train car members Cooperation provided by Railway Technical Research Institute Strain measurement of a high-pressure hydrogen tank Testing of Composite Materials By using an FBG sensor, safe measurement can be performed without any protective equipment in dangerous materials, such as hydrogen gases. Measurement of stress distribution The FBG sensor is affixed to a high-pressure hydrogen tank and pressure distribution measurement and non-destructive testing are performed. *Analysis screens on PC.
4 Fiber Bragg Grating Sensor Soundness Diagnosis for Bridge Pier (IMPACT *) Detection of Disasters *IMPACT is a product distributed by the Railway Technical Research Institute. For railroads, impact oscillation testing is used as a means of diagnosing the soundness of a bridges substructure. IMPACT is offered as a support system for such testing, and can be expanded upon for use in earth retaining with the use of a small exciter. Impact Oscillation Testing Small exciter Signal Small power amplifier containing frequency sweep function Data Acquisition Software Allows choice between oscillation testing or sweep testing Choose from: Impact Impact Accelerometer (wired) Accelerometer (optical fiber) FBG acceleration sensor Reader Analysis Results Schematic view of bridge pier Scouring damage to bridge pier By detecting changes in the natural oscillation of a bridge pier, this system can diagnose soundness and detect scouring damage at an early stage. Cooperation provided by Railway Technical Research Institute *This product is distributed by the Railway Technical Research Institute. Small exciter Optical fiber accelerometer
5 Fiber Bragg Grating Sensor Application Examples Use in structural monitoring The installation of a diagnostic sensor on a bridge for measurement purposes allows the soundness of that bridge to be evaluated. Various Measurement Sensors FBG Clinometer FBG Accelerometer FBG Displacement Gauge Bridge Installation Positioning Example Plan View Accelerometer Cross-sectional View Accelerometer Displacement Gauge Clinometer Displacement Gauge Clinometer Measurement of Progression in Changes FGB sensors enable the monitoring of ground subsidence during road construction. Drain Construction Management (for Displacement/Inclines) during Bypass Construction Displacement gauge Optical fiber clinometer Measurement data for angle of incline (5 mths) Angle of Incline (deg) Incline No.1 Incline No.2 Time Measured (1 graduation=48 hrs) Incline No.3 Incline No.4 Measurement data for displacement (5 mths) Displacement (mm) Time Measured (1 graduation=48 hrs) Displacement No.1 Displacement No.2
6 PF FBG Sensor Read Out Systems PF series Features High-speed sampling The optical fiber grating sensor element of one axis or two axes can be sampled at high speed. Expandability Operability With the PF series, sensor inputs can be connected to up to four channels. (Additionally, up to 30 sensor elements with a measurement range of 1,000 can be connected serially to one channel.) Easy operation by front control panel with 8.4-inch wide display external LAN control is available. Functions OSA (optical spectrum analysis) mode Data logging mode Spectrum analysis, which examines the intensity of light as a function of wavelength, can be performed on the light reflected from each sensor element. The output of each sensor element is converted into physical parameters as and temperature, and data can be recorded over a long period of time. Specification Item Content Available sensor element type One-axis and two-axis sensors Maximum number of sensor elements (per channel) 30 (In the case of the 1000µmeasurement range) Wavelength band 1530 to 1560 nm Wavelength measurement precision ±10 pm Wavelength measurement repeatability ±5 pm Measurement power ranges 10 to -23 dbm Laser output power 10 mw Operating temperature range 0 to 50 C Power source 100 VAC (50/60 Hz) PF PF series Measurement screen
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