Sonic pulse measures strokes in hydraulic cylinders

Nov. 20, 2003
Stroke measurement and proper positioning of hydraulic cylinders on off-highway equipment can be critical in preventing damage to nearby equipment and property. One method of measuring piston position is by using Temposonics-MH analog position sensors from MTS System Corp. which are installed right in the hydraulic cylinder.

Stroke measurement and proper positioning of hydraulic cylinders on off-highway equipment can be critical in preventing damage to nearby equipment and property. One method of measuring piston position is by using Temposonics-MH analog position sensors from MTS System Corp., Sensor Div., Cary, N.C. (www.temposonics.com), which are installed right in the hydraulic cylinder. The sensors use magnetostrictive technology in which the interaction between two magnetic fields creates a sonic pulse. A permanent magnet which moves along the waveguide in the tubular sensor provides one magnetic field. The other field comes from a current pulse or interrogation signal sent down the magnetostrictive waveguide. The resulting sonic pulse travels along the waveguide until it is detected at the end. The sensors then use elapsed time between interrogation and return signals to determine magnet position. This method generates no wear on the sensing components, so the sensors maintain accuracy and consistency over time.

The sensors are relatively small and can be built into hydraulic cylinders. They work regardless of hydraulic fluid used, measure displacements between 50 and 1,000 mm, and output dc signals between 0 and 5 V that are proportional to linear displacement. With direct outputs, no signal-conditioning electronics are needed when interfacing with controllers or meters. Operating temperatures range from -40 to 85°C, and sensors are pressure rated to 300 bar, shock rated to 50 g, and CE certified.

Sponsored Recommendations

June 27, 2025
Ensure workplace safety and compliance with our comprehensive Lockout/Tagout (LOTO) Safety Training course. Learn critical procedures to prevent serious injuries.
June 27, 2025
Join our expert webinar to discover essential safety control measures and best practices for engineering a truly safe and compliant industrial environment.
June 25, 2025
An innovative aircraft with electric drives combines the best of both worlds. The cross between drone and helicopter could mean significantly faster and more efficient air emergency...
June 25, 2025
Effective when other materials fail, ceramics are particularly suitable for applications requiring wear and chemical resistance, sliding characteristics or biocompatibility. Discover...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!