Page 732 - จันทร์จืรา เดชแพง
P. 732
Probes
• Piezoelectric transducer
– Lead zirconate titanate, Lead metaniobate, Barium
titanate
• May be transmitter or receiver
• Variety of frequencies, crystal sizes & angles
• Normal probes
– Longitudinal waves
• Angle probes
– 45°, 60°, 70° in steel
– Transverse waves
