Wireless surface acoustic wave temperature sensor and interrogation system apparatus capable of generating a self synchronizing shaft position indicator for moving platforms

摘要

A surface acoustic wave sensor system for use with a moving platform. The system comprises an interrogator for producing an RF interrogating signal transmitted from a first antenna. A substrate that supports surface acoustic waves is attached to the moving platform and an interdigital transducer (IDT) and reflector are mounted on the substrate. The IDT produces surface acoustic waves (SAW) responsive to the RF interrogating signal. The reflector produces reflected SAW responsive to the incident SAW and responsive to a characteristic of the moving platform. A position indicator produces a synchronization signal input to the interrogator for triggering the RF interrogating signal. The synchronization signal is timed to trigger the RF interrogating signal when the interdigital transducer is within a field-of-view of the first antenna.

主权项

1. A surface acoustic wave sensor system for use with a moving platform, comprising:
an interrogator for producing an RF interrogating signal; a first antenna for transmitting the RF interrogating signal; a substrate attached to the moving platform for supporting surface acoustic waves; an interdigital transducer mounted on the substrate for producing incident surface acoustic waves responsive to the RF interrogating signal; a reflector mounted on the substrate for producing reflected surface acoustic waves responsive to the incident surface acoustic waves, the reflected surface acoustic waves responsive to a characteristic of the moving platform; and a position indicator for producing a synchronization signal input to the interrogator for triggering the RF interrogating signal, the synchronization signal timed to trigger the RF interrogating signal when the interdigital transducer is within a field-of-view of the first antenna.