Couplant

A substance applied between the transducer and test surface to ensure efficient transmission of ultrasonic waves into the material. Common couplants include water, glycerin, honey, and commercial ultrasonic gels. Couplants eliminate air gaps that would reflect ultrasonic energy back to the transducer. The acoustic impedance of couplants is matched closely to both transducer and material surfaces. Proper couplant application is essential for obtaining reliable ultrasonic test results.

Equipment Selection and Use

Proper selection and maintenance of couplant is critical for successful NDT inspections. Equipment must be calibrated and verified per applicable standards.

Maintenance and Verification

Regular maintenance and calibration verification ensure reliable equipment performance. Equipment that falls out of calibration can produce unreliable results.

Best Practices

• Always follow applicable NDT standards and procedures
• Use properly calibrated and maintained equipment
• Ensure personnel are properly trained and certified
• Document inspection procedures and results completely
• Keep current with industry standards and best practices