Ultrasonic transducers for nondestructive testing

Silk, M.G.; Weight, J.P.

doi:10.1016/0308-9126(85)90093-8

Cited by 73 publications

(47 citation statements)

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“…1. Here, the battery is cast into the rear part of the backing which is used to tailor the shape of the generated ultrasound pulse [12]. The electronics is integrated in one single ASIC which is mounted directly on the piezoelectric transducer [13].…”

Section: System Level Considerationsmentioning

confidence: 99%

“…It is also seen that the transducer produces oscillations at a frequency more than 1 decade lower than 4 MHz. These are caused by radial and flexural modes in the transducer that are excited simultaneously as the wanted longitudinal mode [12]. With the transducer integrated in a complete sensor with correct backing and matching layers these modes would be reduced.…”

Section: A Complete Cyclementioning

confidence: 99%

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Ultra-low power transmit/receive ASIC for battery operated ultrasound measurement systems

Johansson

Gustafsson

Delsing

2006

Sensors and Actuators A: Physical

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AbsractThis paper describes the design of the complete transmit and receive electronics circuitry for a piezoelectric transducer in one single ASIC. The chip will be one building block in a thumb size battery operated ultrasound measurement system. The main design target has been to achieve extremely low power consumption while keeping the number of external components minimal.To overcome the dynamic range limitations imposed by a battery supply an on-chip boost converter uses one external inductor to generate up to 40 V for excitation of the transducer. The transducer itself is used as a storage capacitor, whereafter it is rapidly discharged to generate an ultrasound pulse. An on-chip amplifier with intermittent operation is controlled by a state machine and used to amplify incoming echoes. The chip has been fabricated in a 0.8 m high voltage CMOS process, with a total chip area of 12 mm 2 . Measurements verify the design approach. The power consumption for the system reaches within a factor of 2 of the power needed to charge the capacitance of the piezoelectric transducer from a fixed voltage source. The results show the possibility to achieve extremely low power consumption in a battery operated pulse-echo ultrasound measurement system.

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Section: System Level Considerationsmentioning

confidence: 99%

Section: A Complete Cyclementioning

confidence: 99%

Ultra-low power transmit/receive ASIC for battery operated ultrasound measurement systems

Johansson

Gustafsson

Delsing

2006

Sensors and Actuators A: Physical

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“…(4) Applying (4) to model a shear receiver, an aluminum block with a fixed Lwave transmitter was used as shown in Figure 3. The receiver was scanned across the back wall in increments of 0.05 inches as indicated in Figure 3.…”

Section: Receiver Modelmentioning

confidence: 99%

“…Reviewing some of the existing transducer models, such as the layered device structure [3,4] and the equivalent electronic circuits by Mason and others (S], one observes that all these models are one-dimensional approximations of three dimensional transducer behavior. Diffraction losses resulting in ultrasonic beam spread, nonuniform field variation across the aperture and, if the transducer is directly contacted to a solid, mode conversion are not included.…”

Section: Introductionmentioning

confidence: 99%

Transducer Models for the Finite Element Simulation of Ultrasonic NDT Phenomena

Ludwig

Moore

Lord

1987

Review of Progress in Quantitative Nondestructive Evaluation

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“…With the crystal non-rigidly mounted as in these measurements it is subject to non-wanted radial and flexural modes of oscillation [13]. These oscillations remain also to some extent at the time of arrival of the echo after about 15 µs.…”

Section: Resultsmentioning

confidence: 99%

Energy and pulse control possibilities using ultra-tight integration of electronics and piezoelectric ceramics

Johansson

Delsing

IEEE Ultrasonics Symposium, 2004

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Abstract-This paper reports on investigations of the electrical energy needed to generate ultrasound pulses with piezoelectric crystals and compares measurements with system simulations using SPICE models. The piezoelectric device used is a 16 mm diameter Pz27 crystal with a nominal resonance frequency fosc,nom of 4.4 MHz. An optimized ASIC driver stage with 5 V supply voltage is mounted directly on the piezoelectric crystal to generate square-wave excitation pulses. The absence of wiring between driver and crystal provides excellent pulse control possibilities. It is shown that the power consumption varies with the excitation pulse width, which also affects the received ultrasound energy in a pulse echo system. To achieve maximum output ultrasound energy, an excitation pulse width of 100 ns= 0.44/fosc,nom should be used. At a repetition rate of 1 kHz, the power consumption including losses in the driver stage varies from 96 µW for an excitation pulse width of 240 ns, up to 126 µW for an excitation pulse width of 130 ns. The performed SPICE simulations agree well with measured data.

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Ultrasonic transducers for nondestructive testing

Cited by 73 publications

References 0 publications

Ultra-low power transmit/receive ASIC for battery operated ultrasound measurement systems

Ultra-low power transmit/receive ASIC for battery operated ultrasound measurement systems

Transducer Models for the Finite Element Simulation of Ultrasonic NDT Phenomena

Energy and pulse control possibilities using ultra-tight integration of electronics and piezoelectric ceramics

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