Sonic Velocity Alkali Measurement

Wave Propagation

Acoustic wave speed through liquid solutions varies directly with fluid density, compressibility, and dissolved chemical mass. Modern sonic velocity alkali measurement sends high-frequency ultrasonic pulses across a fixed path length filled with mercerization liquor. As caustic soda concentration rises, fluid compressibility drops, causing sound waves to travel faster through the liquid medium.

Precision electronics calculate acoustic velocity differences down to microsecond intervals, translating propagation speed into instant concentration readings. Integrated thermal sensors correct for acoustic speed shifts caused by liquid temperature changes. The resulting signal guides automatic dosing valves to maintain strict chemical target ranges without reagent consumption or optical lens cleaning.

Control Advantage

Direct ultrasonic measurement eliminates signal drift associated with optical refractometers and hydrometer fouling. Implementing sonic velocity alkali measurement reduces chemical consumption by preventing over-dosing during continuous cotton processing operations. Consistent alkali strength stabilizes fiber swelling, ensuring uniform dye receptivity across entire fabric lots.

Automated alarms alert machine operators if acoustic signals indicate chemical depletion or bath starvation.

Acoustic Boundary

Entrained gas bubbles and heavy particulate suspension attenuate acoustic signals and corrupt wave transit calculations. Sonic velocity alkali measurement requires bubble-trap assemblies and quiet fluid zones within padding liquor loops. Extreme fluid turbulence disrupts acoustic propagation paths, introducing signal noise into control systems.

Proper sensor orientation and flow conditioning sustain signal integrity in demanding mill environments.