نتایج جستجو برای: ultrasonic frequency

تعداد نتایج: 509259  

2013
Rafael M. Duarte Juan M. Mauricio Villanueva Maxwell M. Costa Raimundo C.S. Freire Sebastian Y.C. Catunda Wendell M. Costa

Abstrac t This paper presents a procedure for wind speed measurement using ultrasonic transducers based on short-time Fourier transform (STFT). The measurement of wind speed was performed by estimating the ultrasonic transit-time (ToF). For this purpose the estimated ToF was used the technique of digital signal processing, based on the STFT. The ultrasonic signal detection was performed by sett...

2007
I. LIE

The measurement principle of the transit time difference method of the ultrasonic flowmeter is presented. The hardware structure and realization method are introduced. The software function and work mode are overviewed. In order to enhancing flowmeter's precision and stability a Xilinx CoolRunner CPLD and a Texas Instruments microcontroller from MSP430 family are applied in high precision timin...

Journal: :The Journal of the Acoustical Society of America 1957

2017
H. R. Carleton W. J. Chen

The development of the mechanical strength of composite materials which are consolidated by cementaceous bonds has been monitored by observation of the ultrasonic properties over the evolution of bond growth. The granular nature and weak bonding of these materials produce high attenuation of the ultrasonic signal and observation is difficult, particularly in larger structures. In order to obtai...

Journal: :Journal of Foot and Ankle Research 2011

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