Capacitive micromachined ultrasonic transducers (CMUTs) with isolation posts
| Autor: | Yongli Huang, Xuefeng Zhuang, Edward O. Haeggstrom, A. Sanli Ergun, Ching-Hsiang Cheng, Butrus T. Khuri-Yakub |
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| Rok vydání: | 2008 |
| Předmět: |
Miniaturization
Materials science Acoustics and Ultrasonics business.industry Acoustics Capacitive sensing Transducers Equipment Design Electric Capacitance Capacitance Electronics Medical Equipment Failure Analysis Reliability (semiconductor) Transducer Capacitive micromachined ultrasonic transducers Nondestructive testing Calibration Computer-Aided Design Computer Simulation Ultrasonic sensor business Microelectrodes Electrical impedance Ultrasonography |
| Zdroj: | Ultrasonics. 48:74-81 |
| ISSN: | 0041-624X |
| DOI: | 10.1016/j.ultras.2007.11.006 |
| Popis: | In this paper, an improved design of a capacitive micromachined ultrasonic transducer (CMUT) is presented. The design improvement aims to address the reliability issues of a CMUT and to extend the device operation beyond the contact (collapse) voltage. The major design novelty is the isolation posts in the vacuum cavities of the CMUT cells instead of full-coverage insulation layers in conventional CMUTs. This eliminates the contact voltage drifting due to charging caused by the insulation layer, and enables repeatable CMUT operation in the post-contact regime. Ultrasonic tests of the CMUTs with isolation posts (PostCMUTs) in air (electrical input impedance and capacitance vs. bias voltage) and immersion (transmission and reception) indicate acoustic performance similar to that obtained from conventional CMUTs while no undesired side effects of this new design is observed. |
| Databáze: | OpenAIRE |
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