A Double Transducer for High Precision Ultrasonic Time-Domain Reflectometry Measurements
نویسندگان
چکیده
منابع مشابه
A Double Transducer for High Precision Ultrasonic Time-Domain Reflectometry Measurements
Membrane fouling, where unwanted particles accumulate on the membrane surface and reduce its permeability, causes problems in membrane filtration processes. With ultrasonic time-domain reflectometry (UTDR) it is possible to measure the extent of membrane fouling and hence take actions to minimize it. However, the usability of UTDR is very limited to constant filtration conditions if the sonic v...
متن کاملUsing neural networks for calibration of time- domain reflectometry measurements
Time-domain reflectometry (TDR) is an electromagnetic technique for measurements of water and solute transport in soils. The relationship between the TDR-measured dielectric constant (Ka) and bulk soil electrical conductivity (cra) to water content (8W) and solute concentration is difficult to describe physically due to the complex dielectric response of wet soil. This has led to the developmen...
متن کاملTime Domain Reflectometry: Temperature- dependent Measurements of Soil Dielectric Permittivity
The purpose of this study is to determine the temperature influence on the soil bulk dielectric permittivity, ε b, calculated from the measurement of the electromagnetic wave velocity of propagation along the parallel waveguide in a TDR probe, i.e. a probe working in Time Domain Reflectometry technique. The experimental evidence shows that the existing models do not completely describe the temp...
متن کاملTime Domain Reflectometry ( TDR )
This chapter represents the state of the art at the time of release. Readers are encouraged to consult the link below for the version of this chapter with the most recent release date:
متن کاملTheory of a Double-diaphragm Mems Ultrasonic Transducer
Conventional capacitive MEMS transducer designs feature a single flexible diaphragm acting as a moving plate and an electrode patterned on the substrate acting as a stationary plate. Such devices generally function adequately as receivers. However, such devices show poor transmission efficiency when the gap dimension is limited by the manufacturing process and when the diaphragm would suffer “p...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Sensors
سال: 2015
ISSN: 1424-8220
DOI: 10.3390/s150715090