2018 Flow Control Magazine • Power of Passive Sonar Technology
The Power of Passive Sonar Technology • Real-time, Entrained Air Measurement Improves Process Optimization and Efficiency
In the 1950s, the U.S. Navy and British navy began to investigate passive sonar, in which an array of sensors detects noises from a target submarine. Prior to this, navies used active sonar, whereby a submarine emitted a signal that reflected off a target submarine. Unfortunately, this let the target know it was monitored. Passive sonar systems allow the submarine to become stealthy by "listening" to noise emitted from a target submarine and by utilizing a series of sensors - equally spaced on a cable - to receive signals from a target passively. Powerful sonar algorithms convert the signals (pressure fields) into actionable information.
Passive sonar flow technology is the newest flow measurement technology since vortex, Coriolis and ultrasonic flowmeters were introduced in the 1960s and 1970s. Engineered for a wide range of multiphase and single-phase flows, the technology is especially wellsuited for erosive and corrosive slurry flows, such as in the mineral processing industry, since the flowmeter installs and measures from outside the process pipe and does not contact the process media. The ability of the sonar technology to passively measure flows from the outside the pipe enables unprecedented measurement performance and reliability in highly aggressive slurries and fluids, which is designed to virtually eliminate maintenance costs associated and process downtime experienced with traditional slurry flow technologies such as electromagnetic flow and ultrasonic meters.