The ultrasonic measuring principle is used for level measurement in containers and for determining the mixing ratios of liquids such as in SCR systems.
The ultrasonic measurement principle is based on the emission of a sound wave above the audible frequency range and the detection of the resulting echo. In this context, the ultrasonic wave is generated by an electrically excited piezo crystal during the transmission phase. Ultrasonic-based systems are often used in fill level measurement, where the signal’s propagation time is measured up to its reflection at the “liquid/air” media boundary and back. However, with a known reflection distance (such as when using a reflector mounted explicitly for this purpose), ultrasound can also be used to detect the speed of sound in a medium.In fluid-flow measurements, the Doppler effect is utilized to obtain information on the flow velocity of the flowing medium. The AST ultrasonic technology stands out primarily due to its transmitting power, which can be adjusted during the measurement process, as well as due to the variable gain of the receiver.
Together with software algorithms adapted to the respective application, when evaluating signals our sensors are capable of taking readings that are extremely reliable.