CHOWKIDAR emits a laser pulse down a fiber optic cable to measure vibration and temperature as well as the position of that vibration and temperature.
Using a combination of Rayleigh backscatter, Brillouin Backscatter* and time of flight, CHOWKIDAR determines the presence, location, intensity and frequency of vibrations and temperature changes along an optical fiber in real time.
Rayleigh Backscatter responds to physical vibration imparted on the fiber by disturbances to the application. TTSPL’s signal analysis software allows CHOWKIDAR to quickly determine the most likely origin of the vibration and report any erroneous signals to maintenance personnel of potential issues with the pipeline.
Brillouin Backscatter* responds to shifts in environmental temperatures and is used to detect the temperature drop associated with the reduction in fluid pressure caused by the leak taking advantage of the Joule-Thomson effect.

Applications of Pipeline

Installation locations:

  • Oil (Crude of refined)
  • Gas (any type)
  • Chemical
  • Mining tailings
  • Water/waste water
  • Brine
  • Slurries
  • Steam

Possible applications:

  • Buried pipelines (any depth of cover)
  • Unburied pipelines (on supports or laid on ground)
  • Any fluid (gas, oil water or chemical)
  • High or low pressure
  • High or low temperature
  • Hazardous applications
  • Corrosive applications

Functions of Pipeline

TTSPL’s CHOWKIDAR System continually monitors large spans of pipeline looking for vibration and temperature changes, once found the system confirms the alarm and reports them both visually and digitally so that existing site Distributed Control Systems (DCS) can be used to raise an alarm with a maintenance or operations team.
CHOWKIDAR can be thought of as acting as a series of microphones and thermometers* along the fiber recording in real time. The System analyses enormous amount of data using ultra fast Field Programmable Gate Array (FPGA) architecture to give real time feedback on the likely origin and type of the disturbance. Utilizing proprietary pattern recognition software and multi variable sensing CHOWKIDAR reduces the incidences of false positives normally associated with other Fiber Optic Sensors.
CHOWKIDAR’s fast processing speed and pulse rate allow it to detect minute interferences that may otherwise go unnoticed. Some examples of detectable activities include:

  • Pipeline leakage
  • Ground disturbance
  • Manual excavation
  • Machine excavation
  • Vehicle movement near pipeline
  • Hot tapping and/or theft
  • Seismic activity

Technical Specifications of Conveyor Idler Monitoring System

Category Parameter Description
Acoustic (DAS) Sensing
Range 40km per channel
Resolution 250 or 500mm
Frequency Response 1Hz-120kHz (Distance Dependant)
Dynamic Range 50dB
Temperature sensing range (cable) 30°C to 200°C
(special options for temps up to 800°C and down to -200°c available)
Temperature(DTS) Sensing
Accuracy ±0.25°C
Resolution 0.01°C
Scan Time 1-2 Minutes (Temperature Parameter Dependant)
Detectable Temperature -250°C to 700°C
Light source Class 1M infra-red Laser
Laser wave length 1550.12nm (nanometers)
Laser stability ±5pm (picometers)
Acquisition rate 400MHz
Processor transfer rate 64Bit (ultra high speed)
Controller OS Linux
Output Modbus over ethernet (standard) USB
Remote Connectivitiy Ethernet, Wi-Fi, 3G/4G
Processer Field Programmable Gate Array (FPGA)
Data storage (removable) 2x 2TB HDD
Data storage (internal) 128GB solid state drive
Sensing element Single Mode Fiber Optic Sensing cable, type G.652.D
Number of channels 1 or 2
Interrogator operating temperature 0-50°C
Operating humidity (max) 85% non-condensing
Dimensions 4RU 19” rack enclosure (190x600x490mm)
Internal cooling 3 individually controlled fans
Weight 25kg
Power supply 110-240VAC (50-60Hz), 24VDC
Power consumption <200W