Limited Certification for Ultrasonic Digital Thickness Measurement

Course Out Lines as per SNT-TC-1A

1.0          Principles / Theory

1.1                General

1.2                Principals of acoustics

1.2.1            Nature of sound waves

1.2.2            Modes of sound wave generation

1.2.3            Velocity, frequency and wavelength of sound waves.

1.2.4            Attenuation / scattering of sound waves

 2.0       Equipment / Materials

2.1                Equipments

2.1.1           Pulse echo instrumentation

2.1.1.1      Pulse generation

2.1.1.2      Signal Detection

2.1.1.3      Display and recording methods , A-scan, B-scan, C-scan and digital

2.1.1.4      Sensitivity and resolution

2.1.2           Digital Thickness instrumentation

2.1.3           Transducer operation and theory

2.1.3.1      Piezoelectric effect

2.1.3.2      Frequency ( crystal –thickness relationships)

2.1.3.3      Types (straight, angle, single dual etc.)

2.2                Materials

2.2.1           Couplants

2.2.1.1      Purpose and principles

2.2.1.2      Material and their efficiency                                                                

2.2.2           Calibration Blocks

2.2.3           Cables/connectors

2.2.4           Test Specimen

3.0        Techniques / Calibration – Contact straight Beam

4.0        Variables Affecting Test results

4.1        Instrument performance variations

4.2        Transducer performance Variations

4.3        Test specimen variations

4.3.1           Surface condition

4.3.2           Part Geometry

4.3.3           Material Structures

5.0        Procedure /specification Application / Thickness measurement