ACE: A Deep Dive into ACFM Technology
Alternating Current Field Measurement (ACFM) technology represents a significant advancement in non-destructive testing for crack detection and measurement. The ETher ACE ACFMT system delivers this technology in a portable, user-friendly package weighing less than 1.4kg.
How ACFM Works
ACFM works by inducing uniform currents in a test material’s surface and using orthogonal sensors to measure disturbances in these currents. This electromagnetic technique enables precise detection and sizing of surface-breaking defects like fatigue cracks without requiring surface preparation; inspections can be performed directly through coatings.

Key Technical Capabilities
The ETher ACE system provides reliable, accurate defect sizing with both length and depth measurements. Its specialized probes, available in weld and pencil configurations (straight, 90° inline, and 90° transverse), accommodate various inspection scenarios. The system operates at 5kHz for ferritic welds and 50kHz for austenitic welds.
Applications and Investment Value
Key applications include weld inspection, structural integrity assessment of bridges and infrastructure, pipeline monitoring, and inspection of offshore/onshore structures. The system’s 10+ hour battery life, rugged design, and comprehensive reporting software make it ideal for field operations. With ETher’s optional five-year warranty program, the ETher ACE system system represents a valuable investment for companies requiring accurate crack detection and measurement capabilities in challenging inspection environments.

