SELF-POWERED RFID TAG ACTIVATED BY A FLUID AND METHOD FOR USING SUCH RFID TAGS
First Claim
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1. A Radio Frequency IDentifier (RFID) tag for monitoring a presence of a fluid, comprising:
- means for acting, in absence of a fluid, as a passive RFID tag wherein information held therein can be read by means of a nearby RFID reader; and
means for acting, in presence of a fluid, as a self powered active tag capable of transmitting information to a distant RFID reader;
said RFID tag comprising a fluid activated battery for providing electric power in presence of a fluid in order to supply said RFID tag.
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Abstract
The present invention describes a RFID tag and a system and method involving a plurality of RFID tags. Each RFID tag is attached to an object (or to a structure or a person) on which the presence of a predefined fluid is monitored.
- In a first state, (absence of the monitored fluid), the tag is acting as a passive RFID tag, and the information it holds, (at least its identifier—ID), can be read with a proximity reader (a hand held or stationary/fixed reader). This operation is performed when the RFID tag is attached to the object (or person) to be monitored. At this stage a table associating tag ID, object name (or person name) and location (or any other information), may be built, and may be recorded so that information it contains is accessible by a control center.
- In a second state, whenever the monitored fluid appears on the tagged object, a fluid activated battery generates the electrical power which is used to power the RFID tag. The RFID tag then acts as an active RFID tag and starts to emit messages (an alert for instance) which can be received by a distant RFID reader. Alert messages include at least the tag ID but may comprise additional information like a name or a location.
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Citations
17 Claims
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1. A Radio Frequency IDentifier (RFID) tag for monitoring a presence of a fluid, comprising:
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means for acting, in absence of a fluid, as a passive RFID tag wherein information held therein can be read by means of a nearby RFID reader; and means for acting, in presence of a fluid, as a self powered active tag capable of transmitting information to a distant RFID reader; said RFID tag comprising a fluid activated battery for providing electric power in presence of a fluid in order to supply said RFID tag. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for monitoring a presence of a fluid, comprising:
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a radio frequency identifier (RFID) tag configured to; act, in absence of a fluid, as a passive RFID tag wherein information stored therein can be read by an RFID reader; and act, in presence of a fluid, as a self powered active tag that can transmit information to an RFID reader; the RFID tag comprising a fluid activated battery for providing electric power in presence of a fluid to power the RFID tag. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An apparatus, comprising:
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a diaper; and a radio frequency identifier (RFID) tag configured to; act, in absence of a fluid in the diaper, as a passive RFID tag wherein information stored therein can be read by an RFID reader; and act, in presence of a fluid in the diaper, as a self powered active tag that can transmit information to an RFID reader; the RFID tag comprising a fluid activated battery for providing electric power in presence of a fluid in the diaper to power the RFID tag.
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Specification