LABORATORY CNR ISPC: Stone LAB
NAME OF THE INSTRUMENT
Instrumentation for ultrasonic velocity measurement (PUNDIT PL-200 and PUNDIT PD8050)
GENERAL DESCRIPTION
The instrumentation includes two measuring devices:
- PUNDIT PL-200, equipped with transducers of different frequencies
- PUNDIT PD8050 with pulse-echo technology and multi-channel array-type transducer.
The PUNDIT PL 200 enables ultrasonic velocity measurement within the material being transmitted. The PUNDIT PD 8050 is an ultrasonic tomograph that operates in pulse-echo mode allowing S-wave velocity measurements, and defects and inhomogeneities detection, returning the two- and three-dimensional images.
TECHNICAL DESCRIPTION PUNDIT PL 200:
The PUNDIT PL-200 instrument is equipped with transducers of different frequencies:
- 2 transducers 24 kHz
- 2 transducers 150 kHz
- 2 transducers 250 kHz
- 2 transducers 500 kHz
- 2 54kHz exponential transducers
Bandwidth 20 to 500 kHz, Measurement resolution 0.1 us, Pulse voltage ±100 to ±450 V (UPV), Receiver Gain 1 to 10,000x (0 to 80 dB) Transducer nominal frequency 24 to 500 kHz.
TECHNICAL DESCRIPTION PUNDIT PD8050:
Bandwidth 20 - 80 kHz, Technology Multi-channel Ultrasonic Pulse Echo, Measuring Resolution
1 us, Pulse Voltage ±50 to ±150 V (UPE), Receiver Gain 1 to 10.000 (0 to 80 dB)
The PUNDIT PD8050 instrumentation, combined with the PUNDIT PL-200 instrumentation, enables:
- L’esecuzione di misure in modalità “Pulse Echo” per la verifica della presenza di difetti in campioni omogenei di elementi lapidei naturali ed artificiali attraverso un trasduttore di tipo Array con tecnologia Multi-canale Ultrasonic Pulse Echo
- The measurement of S-wave velocity within the material and determination of the thickness of the material with known S-wave velocity
- The transmission ultrasonic velocity measurements with transducers of different frequencies (24 kHz, 54 kHz, 150 kHz, 250 kHz, 500 kHz, 54 kHz exponential) to analyze stone materials of different characteristics and sizes.
The ultrasonic velocity is related to the physical/mechanical characteristics of the materials and therefore its estimation makes it possible to compare the characteristics of different materials, evaluate the effect of consolidation treatments and the extent of degradation/alteration processes.
Referent:
Emilia Vasanelli emilia.vasanelli@cnr.it