NM01M120L

SIUI Wide Bandwidth Normal Probe

Model Name (Inferred): SIUI M1-20L or SIUI P1-20L / RM1-20L (Wide Frequency Variant)

(Based on SIUI's catalog naming convention, "M" or "P/RM" often denotes the Wide Frequency Bandwidth Series, "1" is $1\text{ MHz}$, "20" is $\Phi 20\text{ mm}$ element, and "L" is Lemo 00 connector.)

Product Overview

This is a premium Single Element Normal Probe from SIUI, specifically from the Wide Frequency Bandwidth Series (Composite Materials). It is engineered to deliver a short pulse and high bandwidth (typically ¹$\ge 60\%$) for superior signal-to-noise ratio in difficult-to-inspect materials, combining excellent penetration with enhanced resolution.²

🛠️ Technical Specifications

🎯 Key Selling Points & Applications

Emphasize the unique benefits of the Wide Frequency Series and the specific combination of $1\text{ MHz}$ and $20\text{ mm}$:

1. Superior Performance in Composite & Attenuative Materials

• Composite NDT: Specifically designed for materials with complex internal structures like Carbon Fiber Reinforced Polymers (CFRP), thick fiberglass, and other non-metallic composite structures.

• Coarse Grain Penetration: The $1\text{ MHz}$ frequency, combined with the wide bandwidth pulse tuning, allows for effective testing of coarse-grained castings, large forgings, and high-temperature alloys where higher frequencies fail.

2. Maximum Energy and Scan Coverage

• The large $\Phi 20\text{ mm}$ element provides a powerful sound beam with high acoustic output, making it ideal for inspecting thick plates, large components, and materials with significant acoustic attenuation.

3. High Flaw Detection Sensitivity

• The Wide Bandwidth design provides a shorter, cleaner pulse compared to standard $1\text{ MHz}$ probes, resulting in higher axial resolution for better separation of defects deep within the material.

Key Features:

• Optimized for Composite Inspection: This probe is specifically designed to provide superior performance when examining composite materials. Its characteristics are tailored to overcome the inherent acoustic complexities of these layered structures.

• Wide Frequency Bandwidth: The "Wide Frequency Bandwidth Series" designation indicates a broad range of usable frequencies around the nominal 1 MHz center frequency. This wider bandwidth results in a shorter ultrasonic pulse, which is crucial for achieving high axial resolution. This enhanced resolution is particularly beneficial for detecting and distinguishing closely spaced features or defects within the distinct layers of composite materials. Typically, these probes exhibit a -6dB bandwidth of 60% or greater.

• Normal Beam Configuration: As a normal probe, it generates longitudinal ultrasonic waves that propagate directly into the test material at a 90-degree angle to the surface. This makes it ideal for identifying defects oriented parallel to the sound beam, such as delaminations, voids, and inclusions that lie perpendicular to the inspection surface. It is also used for accurate thickness measurements of composite components.

• Center Frequency: 1 MHz: The 1 MHz frequency offers a favorable balance between penetration capability and resolution for a wide variety of composite material thicknesses and types. Lower frequencies generally offer greater penetration in attenuative materials, while higher frequencies provide improved resolution for detecting smaller anomalies. The 1 MHz frequency often serves as an excellent compromise for composite inspections.

• Crystal Diameter: 20 mm: The 20 mm diameter of the piezoelectric crystal element contributes to a more focused and less divergent ultrasonic beam, particularly in the far field. This improved beam collimation enhances sensitivity to defects at greater depths within the composite and provides a larger acoustic footprint on the material surface for more comprehensive coverage during scanning.

• Lemo 00 Connector: The inclusion of a Lemo 00 connector ensures a secure, stable, and noise-free electrical connection to compatible ultrasonic testing equipment. This is a common and reliable connector type used in non-destructive testing.

• Protective Membrane: These probes typically incorporate a durable protective membrane on the contact face. This membrane serves to improve acoustic coupling with the often textured or uneven surfaces of composite materials and also acts as a wear surface, protecting the sensitive transducer element from abrasion and damage during scanning.

• Short Ultrasonic Pulse: The wide bandwidth design inherent to this probe series produces a short duration ultrasonic pulse. This short pulse is essential for high axial resolution, enabling the clear separation of echoes originating from closely spaced interfaces or defects within the layered structure of composite materials.

Applications:

• Detection of delaminations (inter-ply separation) in composite laminates.

• Identification and evaluation of voids and porosity within the composite matrix.

• Inspection for the presence of inclusions or foreign materials embedded within the composite structure.

• Precise thickness measurements of composite panels and components.

• Assessment of bond integrity in adhesively bonded composite structures.