The Sonatest SMM and LMM series consist of small and large single normal beam compression wave contact transducers equipped with replaceable soft membrane faces. Built with circular lead metaniobate crystals and medium damping for medium bandwidth, these transducers are designed to maintain optimal acoustic coupling on rough, curved, or uneven surface conditions.
Key Features & Advantages
Single Normal Beam Design: Engineered for straight-beam compression wave contact inspection.
Lead Metaniobate Crystal: Utilises a circular lead metaniobate crystal element for consistent acoustic signal transmission.
Replaceable Soft Membrane: Protects the face and provides excellent conformability and coupling on rough component surfaces.
Medium Damping: Medium damped to deliver an optimal balance of bandwidth, pulse resolution, and signal penetration.
Operating Temperature: Maximum operating temperature rating of 50°C (120°F).
Common Applications
Evaluation of castings
Inspection of forgings
Flaw detection in white metal bearings
Transducer Models
Small Single Compression Transducers (SMM)
| Product Code | Description | Frequency (MHz) | Crystal Diameter (mm / Inches) | Nearfield Length in Steel (mm / Inches) |
| SMM2-10 | Single Softface 2MHz 0° | 2 MHz | 10 mm / 0.394″ | 8.4 mm / 0.331″ |
| SMM4-10 | Single Softface 4MHz 0° | 4 MHz | 10 mm / 0.394″ | 16.8 mm / 0.661″ |
Large Single Compression Transducers (LMM)
| Product Code | Description | Frequency (MHz) | Crystal Diameter (mm / Inches) | Nearfield Length in Steel (mm / Inches) |
| LMM1-24 | Single Softface 1MHz 0° | 1 MHz | 24 mm / 0.945″ | 24.2 mm / 0.953″ |
| LMM2-24 | Single Softface 2MHz 0° | 2 MHz | 24 mm / 0.945″ | 48.3 mm / 1.902″ |
| LMM4-24 | Single Softface 4MHz 0° | 4 MHz | 24 mm / 0.945″ | 96.6 mm / 3.803″ |
Case Dimensions and Details
| Transducer Version / Crystal Size | Width/Diameter (mm / Inches) | Height (mm / Inches) | Connector Options | Position Options |
| SMM | 23 mm / 0.906″ | 42 mm / 1.654″ | Z | Side |
| LMM | 32 mm / 1.26″ | 60 mm / 2.362″ | L | Side |
**Errors and omissions excepted (E&OE)
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