Multi-mode and multi-frequency guided wave imaging via chirp excitations

Abstract

Guided wave imaging has shown great potential for structural health monitoring applications by providing a way to visualize and characterize structural damage. For successful implementation of delay-and-sum and other elliptical imaging algorithms employing guided ultrasonic waves, some degree of mode purity is required because echoes from undesired modes cause imaging artifacts that obscure damage. But it is also desirable to utilize multiple modes because different modes may exhibit increased sensitivity to different types and orientations of defects. The well-known modetuning effect can be employed to use the same PZT transducers for generating and receiving multiple modes by exciting the transducers with narrowband tone bursts at different frequencies. However, this process is inconvenient and timeconsuming, particularly if extensive signal averaging is required to achieve a satisfactory signal-to-noise ratio. In addition, both acquisition time and data storage requirements may be prohibitive if signals from many narrowband tone burst excitations are measured. In this paper, we utilize a chirp excitation to excite PZT transducers over a broad frequency range to acquire multi-modal data with a single transmission, which can significantly reduce both the measurement time and the quantity of data. Each received signal from a chirp excitation is post-processed to obtain multiple signals corresponding to different narrowband frequency ranges. Narrowband signals with the best mode purity and echo shape are selected and then used to generate multiple images of damage in a target structure. The efficacy of the proposed technique is demonstrated experimentally using an aluminum plate instrumented with a spatially distributed array of piezoelectric sensors and with simulated damage.

Rapid Defects Features Extract Techniques with Chirp Signal in Plate Structures

“…Because the starting frequency, end frequency and the duration time of a linear chirp signal are apt to be controlled, there are already many studies about chirp signals used in NDT and SHM fields [6][7][8][9].Multiple narrowband and tone burst responses can easily be extracted from broadband chirp stimulate responses in experiments or simulations. Abroad band chirp excitation, which maybe be limited by Gaussian or Hanning window, could be effectively used to significantly improve the signal-to-noise ratio(SNR) without time domain averaging.…”

“…CHIRPSIGNAL FREQUENCY CHANGE FROM 50kHzTO 120kHz OVER A 58.7μs WINDOW As described in [6], the response of a tone burst excitation in frequency domain can be calculated with the following equation:…”

An integrated structural health monitoring system based on electromechanical impedance and guided ultrasonic waves

“…In ultrasonic testing, chirp or broad-band inputs were employed to perform mode-selected excitations to detect damage in rods and plates [48][49][50], acoustic imaging [51,52], narrowband excitations [53], and high-resolution Lamb wave generation [54]. In particular, Michaels et al [53] used a chirp to retrieve the response to a given tone burst excitation whose frequency falls within the frequency range of the chirp itself.…”

In Situ Estimation of Applied Biaxial Loads with Lamb Waves (Preprint)

“…described in [21]. The S 0 Lamb wave mode was chosen for analysis because it has clear first arrivals from all the transducer pairs and it is also the dominant mode at this frequency.…”