초록 ▼

A sensor system for determining the position of at least one edge of a web of material is provided. The sensor system includes a transmitter and a receiver disposed on opposite sides of the web. The transmitter is capable of selectively transmitting ultrasonic signals, and the receiver is capable of

A sensor system for determining the position of at least one edge of a web of material is provided. The sensor system includes a transmitter and a receiver disposed on opposite sides of the web. The transmitter is capable of selectively transmitting ultrasonic signals, and the receiver is capable of receiving such ultrasonic signals and generating output signals indicative of the position of the web. The sensor system further includes a sensor drive circuit adapted to periodically transmit to the transmitter a transmitter drive signal representative of substantially one cycle of a signal, and to receive signals from the receiver with each signal being indicative of the position of the web.

대표청구항 ▼

[ What is claimed is:] [1.]1. A sensor system for determining the position of at least one edge of a web of material, the sensor system comprising:a transmitter being capable of selectively transmitting ultrasonic signals;a receiver positioned to receive at least a portion of the ultrasonic signals

[ What is claimed is:] [1.]1. A sensor system for determining the position of at least one edge of a web of material, the sensor system comprising:a transmitter being capable of selectively transmitting ultrasonic signals;a receiver positioned to receive at least a portion of the ultrasonic signals transmitted by the transmitter and being capable of generating receiver output signals indicative of the position of the web;means for periodically transmitting to the transmitter a transmitter drive signal with each transmitter drive signal representative of substantially one cycle of a substantially sinusoidal waveform having a selected frequency; andmeans for receiving receiver output signals from the receiver with each receiver output signal being indicative of the position of at least a portion of the web.