کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
737947 893973 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influences of perforation ratio in characteristics of capacitive micromachined ultrasonic transducers in air
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Influences of perforation ratio in characteristics of capacitive micromachined ultrasonic transducers in air
چکیده انگلیسی

Capacitive micromachined ultrasonic transducers (CMUTs) with a perforated membrane have been fabricated and characterized in air. Two types of CMUT device have been fabricated having perforation ratio (area ratio of holes = AR) of 10% and 20%, and analyzed about electrical and mechanical characteristics. The perforation ratio (AR) of membrane substantially influences on the electrostatic force and mechanical restoring force of the device since it leads to the area variation of electrode and membrane, it subsequently influences on the sensitivity and frequency response of the CMUT device. The electrostatic force and mechanical restoring force were improved by decreasing the AR and increasing the DC bias voltage. The open-circuit sensitivity of a CMUT having AR 10% membrane, 8.45 μV/Pa, is larger than that of AR 20%, 4.07 μV/Pa at DC 15 V. Furthermore, the resonance behaviors were observed in the range of 60–80 kHz, and the resonance frequency could be changed by varying the applied DC voltage and AR.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators A: Physical - Volume 171, Issue 2, November 2011, Pages 191–198
نویسندگان
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