Ultrasonic Air Coupled Transducer Output Impedance Measurement Technique

Linas Svilainis, Andrius Chaziachmetovas, Tomas E. Gomez Alvarez-Arenas

Abstract


Estimation of the output impedance of ultrasonic transducers is required for electrical matching circuits design and for receiving amplifiers noise optimization. This paper presents a simple technique for transducer output impedance estimation using the same data acquisition system and signals that are conventionally used in non-destructive testing. A pair of ultrasonic transducers is used: one for transmission, one for reception. Received signal is recorded under low and high resistance load and transducer output impedance is then obtained from these two signals. Hence, this technique requires only one measurement channel and bias errors are low (no need for calibration). In addition, it is ground referenced and does not require the transducer to be removed from the positioning fixture. Experimental results obtained using different probing signals have been compared against conventional measurements obtained by an impedance analyser.

DOI: 10.5755/j01.eie.25.1.22731


Keywords


Amplifier; Output impedance measurement; Noise analysis; Noise density; Signal to noise ratio; Ultrasound transmission; Ultrasonic measurements.

Full Text: PDF

Refbacks

  • There are currently no refbacks.


Print ISSN: 1392-1215
Online ISSN: 2029-5731