Absolute Hydrophone Calibration to 40MHz Using Ultrasonic Far-Field
نویسندگان
چکیده
An absolute hydrophone calibration technique using ultrasonic far-field with optical interferometry was extended to 40MHz to evaluate the sound pressure amplitude generated by medical ultrasound equipment. A 1-mm nominal radius plane transducer was the calibration sound source for an ultrasonic far-field at 50mm propagation distance at 40MHz. The transducer’s effective radius was 0.88mm at 40MHz, with a range of 1040MHz. A coplanar membrane hydrophone with a 0.2mm radius active element was calibrated using the technique at frequencies of 1040MHz with a 1MHz frequency interval. Calibration results obtained using the developed system were compared with those obtained using our current calibration system. The discrepancy between those results was within the uncertainty of our current calibration system for frequencies of 1020MHz. [doi:10.2320/matertrans.I-M2014814]
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