Guided wave radar delay lock loop circuit

摘要

A guided wave radar level measurement instrument comprises a probe defining a transmission line for sensing material level. A probe interface circuit is connected to the probe for generating pulses on the transmission line and receiving reflected signals from the transmission line. The probe interface circuit comprises a transmit pulse generator for generating a transmit pulse, a sample pulse generator for generating a sample pulse, and a delay lock loop for controlling the transmit and sample pulse generators. The delay lock loop is controlled by a pulse repetition frequency having a duty cycle less than 50%.

主权项

1. A guided wave radar level measurement instrument comprising:
a probe defining a transmission line for sensing material level; and a probe interface circuit connected to the probe for generating pulses on the transmission line and receiving reflected signals from the transmission line, the probe interface circuit comprising a transmit pulse generator for generating a transmit pulse, a sample pulse generator for generating a sample pulse, and a delay lock loop for controlling the transmit and sample pulse generators, the delay lock loop being controlled by a pulse repetition frequency signal having a duty cycle less than 50%.