Download - LGI$100DistributedTemperatureandStrainSensingSystem ’ Description.pdfdemodulation’of’the’signals’fromeach’ofthesesensors.These’sensing’elements’ are’highlysensitive’to’temperature’and’strain,’and’canoperatereliablywith

LGI-‐100 Distributed Temperature and Strain Sensing System

1. What is LGI-‐100? LGI-‐100 is a fiber optic sensing system for real-‐time distributed temperature and strain sensing. The system consists of a sensing fiber that has a large number of serial sensing elements and an interrogation instrument for accurate demodulation of the signals from each of these sensors. These sensing elements are highly sensitive to temperature and strain, and can operate reliably with excellent long-‐term stability even under harsh environments including high temperatures. LGI-‐100 is the only product in the market today that offers fast and long range distributed temperature and strain sensing. The combined advantages of 2s speed, 10km sensing distance, 1,000 sensor multiplexing capacity and low cost make LGI-‐100 a unique solution for applications where high performance and cost effectiveness are important at the same time.

2. How does it work?

A near infrared laser in the LGI-‐100 interrogator launches an optical pulse in the sensing fiber. As the laser propagates down the fiber, it is partially reflected by each of the serial sensors. These reflections then travel along the same fiber back to the interrogator and are opto-‐electronically detected and analyzed. An advanced signal processing algorithm is applied to demodulate these signals to accurately determine the temperature or strain at each of these sensor location in real time.

3. Typical applications LGI-‐100 is featured with a set of intrinsic advantages including long range distributed sensing with fast response, flexible sensor spacing, excellent long term stability, harsh environment capability and low cost. These superior characteristics make this product a perfect choice for a wide range of engineering applications, which may include but are not limited to • Structural health monitoring for dams, tunnels, bridges, highways, high-‐

speed railroads, etc. • Oil/gas well integrity real time assessment • Fire detection

S E N T E K I N S T R U M E N T L L C www.sentekinstrument.com

We challenge the impossible



4. Technical specifications

Parameters LGI-100

Temperature Precision ≤0.5oC Strain Precision ≤5µε Data update rate ≤5s

Output data interface USB Operating temperature 0 - 50oC

Power 110/220V 60/50Hz Instrument dimensions 13×39×44cm

Instrument weight 10.4kg

Fiber Specifications Fiber coating Acrylate Polyimide

Long-term max operating temperature 80oC 300oC Short-term max operating temperature 180oC 400oC

Max number of sensors 1,000 Max fiber distance 10km

Sensor spacing By customer input

