OverviewPencil surface probes are detachable stainless-steel shaft probes with an adjustable collar to set the inspection angle and improve stability. They incorporate small-diameter housings and small coils optimized for higher-frequency eddy-current inspection and are typically used for detecting surface-breaking cracks and small defects in aerospace structures.
Advantages- High sensitivity to small, surface-breaking defects.
- Stable contact on flat and slightly curved surfaces thanks to the adjustable collar.
- Available with Powerlink™ connector options for simplified cabling.
- Wide selection of frequency ranges to match inspection targets.
- Multiple coil configurations (reflection, absolute, bridge) to suit detection and resolution needs.
Applications- Through-paint inspection of aircraft rivets and fasteners.
- Aircraft structure, component and engine surface crack inspection.
- Detection of stress corrosion cracking in painted stainless and carbon steels.
- Surface crack inspection on manufacturing and transportation equipment related to aerospace maintenance and production.
Reflection DifferentialReflection type probes- Also known as send‑receive or driver‑pickup probes
- Excellent for small, localized defects such as fatigue cracking.
- Lower drift compared with bridge probes and directional sensitivity.
- Driver and pickup coils can be optimized independently, enabling a wider usable frequency range.
- Good resistance to temperature variations.
Absolute BridgeAbsolute bridge type probes- Internal reference coils provide optimized matching to the test coil when used with Triax (Fisher) or Powerlink™ connectors.
- Shielded coil variants deliver higher resolution for fine crack detection.
- Omnidirectional crack detection capability.
- Commonly used, cost-effective probe type for routine inspections.
Reflection AbsoluteReflection type probes- Also known as send‑receive or driver‑pickup probes
- Response similar to absolute bridge probes with options for stacked or concentric driver/pickup coils.
- Operates over a wide frequency range and resists temperature variations.
- Enables crack detection in all directions depending on coil configuration.
Bridge DifferentialBridge differential probe- Designed for small defect detection with directional sensitivity.
- Provides clear, stable signals for differential measurement setups.
Available variants and connectors- Frequency coverage across models: 100 kHz up to 6 MHz with multiple tuned ranges to match applications.
- Shielding options: shielded (higher resolution) and unshielded variants.
- Connector types: Triax (Fisher) or Powerlink™ depending on model and cable requirements.
- Many part IDs and item numbers correspond to specific coil, shielding and connector combinations (refer to variant tables for exact references).
Technical specifications- Probe family: Pencil surface probes (detachable stainless-steel shaft).
- Adjustable collar for angle optimization and improved contact stability.
- Small coils and small-diameter housing optimized for higher frequencies.
- Typical use: surface‑breaking crack detection and small defect inspection in aerospace components.
- Available probe types: Reflection Differential, Absolute Bridge, Reflection Absolute, Bridge Differential.
- Coil configurations: reflection (driver/pickup), absolute (internal reference), bridge differential.
- Frequency ranges: 100 kHz–6 MHz (model-dependent).
- Connector options: Triax (Fisher) or Powerlink™.