G - Physics – 08 – C
Patent
G - Physics
08
C
325/41
G08C 17/00 (2006.01) G01D 4/00 (2006.01) G08C 15/00 (2006.01) G08C 25/00 (2006.01)
Patent
CA 1282118
ABSTRACT OF THE DISCLOSURE The present invention provides an automatic/remote instrument monitoring system of the type having a plurality of RF transponders configured to operate with at least one of a plur- ality of parameter sensing instruments remotely located from an interrogate/receiver which transmits an RF activation signal to the transponders and which receives and processes RF transponder signals from the transponders, an enable circuit associated with each transponder for causing transponders of the system to ini- tiate transmission of their RF transponder signals at random times with respect to one another in response to the RF acti- vation signal, the enable circuit comprising RF detector means for receiving the RF activation signal from the interrogate/ receiver, detecting the activation signal, and producing a detec- tor signal representative thereof; timing means for timing inte- gration periods, wherein the integration periods of the trans- ponders of the system are randomly skewed with respect to each other; integrator means operatively coupled to the timing means and the RF detector means for integrating the detector signal over the integration periods and producing an integrator output signal representative of an integral of the detector signal; and comparator means for comparing the integrator output signal to a threshold value and for producing a transponder enable signal causing the transponder to initiate transmission of its RF trans- ponder signal at random times with respect to other transponders of the system, if the integrator output signal attains the thres- hold value during an integration period.
612699
Denzene Quentin Scott
Grindahl Mervin Lee
Denzene Quentin Scott
Grindahl Mervin Lee
Itron Inc.
Marks & Clerk
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