Title :
Exploiting Pseudorandom Sequences to Enhance Noise Immunity for Air-Coupled Ultrasonic Nondestructive Testing
Author :
Ricci, Marco ; Senni, Luca ; Burrascano, Pietro
Author_Institution :
Dept. of Ind. Eng., Univ. of Perugia, Terni, Italy
Abstract :
The application of a pulse-compression procedure based on pseudorandom m-sequences to air-coupled ultrasonic nondestructive testing is presented. The signal-to-noise ratio enhancement assured by this technique is theoretically analyzed and experimentally verified, particularly focusing on the positive effect of the procedure to reduce quantization noise. The possibility of faithfully reconstructing signals whose amplitudes are lower than the quantization step of the analog-to-digital converter (ADC) board is analyzed theoretically and experimentally verified.
Keywords :
acoustic signal processing; m-sequences; pulse compression; quantisation (signal); random sequences; signal denoising; signal reconstruction; ultrasonic materials testing; ADC; air-coupled ultrasonic nondestructive testing; analog-to-digital converter; noise immunity enhancement; pseudorandom m-sequences; pulse compression; quantization noise reduction; signal reconstruction; signal-to-noise ratio enhancement; Nondestructive testing; Pulse compression methods; Quantization; Signal to noise ratio; Transform coding; Air-coupled ultrasonic; noise suppression; nondestructive testing (NDT); pseudorandom codes; pulse compression; quantization noise; transform coding;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2012.2200409
