Converter control with LC filtering

US7366057B2 · kind B2 · utility

Assignee

• HYDROMETER GMBH · DE

Inventors

• Ulrich Gaugler · Nastätten, DE
• Horst Ziegler · Berlin, DE
• Horst Behlen · Paderborn, DE

Key dates

• Filing date: Oct 24, 2006
• Grant date: Apr 29, 2008
• Expiry date: Oct 24, 2026

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F1/662
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An arrangement for signal processing in ultrasonic transducers in flow meters has an ultrasonic transducer acted upon by a drive signal with the ultrasonic transducer being connected to a resonant circuit matched to the frequency of the drive signal. The resonant circuit can be a component of the network which makes switching over the ultrasonic transducer for transmitting operation to a receiving operation possible. An ultrasonic flow meter uses time-of-flight principle for transmitting and receiving ultrasonic signals and signal post-processing of the received ultrasonic signals. To make available an ultrasonic flow meter that produces an improved quality voltage signal for evaluation and at the same time makes possible a reduction of its production costs, a ringing circuit is provided. The ringing circuit may be a series ringing circuit for signal post-processing of the received ultrasonic signals connected to a comparator and using an LC-circuit, a Pi-filter or an RLC-circuit.