Resonant Acoustic Method

Resonance Inspection Delivers 100% Quality Inspected Parts

ndt ram system

In the world of manufacturing today, the potential liability of shipping a defective part is catastrophic to you, your customer and the consumer. Resonant Inspection via Non-Destructive Test Resonant Acoustic Method (NDT-RAM™) is designed to help you deliver fully inspected parts, economically and on time, giving you confidence in the quality of your parts.

The principle of NDT-RAM is simple. Every part has a unique resonant signature or pattern that reflects its composition. Any deviation from the expected signature or pattern indicates the presence of a structural flaw or variation. A familiar example is a cracked bell that no longer has a clear ring and cannot hold its tone.  Learn more about how NDT-RAM compares to other methods of non-destructive testing and non-destructive inspection.

NDT-RAM detects imperfections such as variances in dimension, geometry, weight, density, bonding, voids, cracks and missed manufacturing processes. The entire procedure takes approximately 3 seconds per part, allowing for efficient quality control testing of all the parts in your process line.

Who needs NDT Resonant Inspection?

Manufacturers or users of metal parts that:

  • Have substantial inspection cost
  • Require 100% inspection of their parts
  • Desire to improve quality of their parts
  • Produce and/or use safety-critical parts
  • Have customers demanding higher quality
  • Have substantial scrap costs due to false rejects

What can NDT Resonant Inspection detect?


  • No "part preparation" required
  • Inspection in one to three seconds per part, typical*
  • Reduction of scrap costs with elimination of false rejects
  • Process compensation for common process variables
  • Easy to learn and use application software
  • Report generation, including statistical analysis
  • Industrial package - NEMA4 enclosure, sealed PC
  • Same system can test many different parts
  • Confidence that all tested parts are defect-free

*Part throughput rate dependent upon part size, belt size, data acquisition setup parameters, and other part handling requirements


Overview of the NDT-RAM Automated Non-Destructive Quality Test System Model RAM-AUTO