Signal transmission system for trigger probe

Details Signal transmission system for trigger probe Signal transmission system for trigger probe

1992-03-25

1994-01-18

Cuchlinski, Jr., William A.

Geometrical instruments

Gauge

Movable contact probe, per se

33558, 455 66, 34087016, G01B 2104, H04B 700

Patent

active

052790428

ABSTRACT:
A radio transmission system for a touch trigger probe for machine tools or coordinate measuring machines. In the transmitter shown in FIG. 1, a 1 kHz oscillator produces a signal which is phase modulated by an electronic switch and an inverter, when electrical contacts within the probe change state. This phase modulated signal is mixed in a mixer with an unmodulated 500 Hz reference signal, produced in a divider from the oscillator, so that there is a precise phase relationship between the two signals. The receiver shown in FIG. 2 has filters which separate out the 500 Hz reference signal and the phase modulated 1 kHz signal. A decoder phase demodulates the 1 kHz signal, using the 500 Hz signal as a reference in order to increase the reliability of the resulting signal.

REFERENCES:
patent: 4118871 (1978-10-01), Kirkham
patent: 4130941 (1978-12-01), Amsbury
patent: 4153998 (1979-05-01), McMurtry
patent: 4658509 (1987-04-01), Juengel
patent: 4864294 (1989-09-01), Fakuhisa
patent: 5056235 (1991-10-01), Thomas
patent: 5065035 (1991-11-01), Juengel
"Pilot-Tone System For Mobile Communication"; NTIS Tech Notes; 1987, Springfield, Va., USA; p.26.

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