SMART ENERGY SCAVENGING TAG SENSOR

• US 20160188920A1
• Filed: 12/31/2014
• Published: 06/30/2016
• Est. Priority Date: 12/31/2014
• Status: Active Grant

• Current Assignee: Intermec IP Corporation (Honeywell International Inc.)
• Original Assignee: Intermec IP Corporation (Honeywell International Inc.)
• Inventors: KELLY, Stephen J., NIKITIN, Pavel
• Granted Patent: US 10,733,394 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06K 19/0711 the source being mechanical or acoustical
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G06K 7/10158 methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field
• CPC Class Codes: G06K 7/10217 parameter settings controlling the transmission power of the interrogator

Abstract

A smart tag reading system is provided that has the ability to query sensor tags that have energy harvesting capability. In one embodiment, an adaptive reader system learns the state of each tag and how long the tag takes to charge. Tags that charge relatively quickly can be accessed more frequently. Others that do not charge as quickly, readings can be performed at much longer intervals allowing the tag a longer time to gather enough energy to complete the transaction. The reader query system can then adapt to the environment and state of the individual tags.

Claims

1. An RFID reader comprising:

an antenna that sends interrogation signals to an RFID tag at first time intervals, wherein the RFID tag harvests energy from a source other than the RFID reader;

a controller that;

identifies responses received from the RFID tag in response to the interrogation signals sent to the RFID tag,

in response to a determination that the RFID tag did not respond to at least one of the interrogation signals, the controller decreases the first time interval to a second time interval;

sets an interrogation signal interval of the RFID reader to the second time interval so that the antenna the interrogation signals are sent at the second time intervals.

2. The RFID reader of claim 1, wherein the controller determines if the RFID tag has responded to each of the interrogation signals sent by the RFID reader.

3. The RFID reader of claim 2, wherein the controller increases the first time interval to a third time interval so that the interrogation signals sent to the RFID tag are sent at a higher frequency.

4. The RFID reader of claim 3, wherein the controller determines if the RFID tag responds to each of the interrogation signals sent having third time intervals, and if the RFID tag did not respond to at least one of the interrogation signals having third time intervals, the controller decreases the third time interval to a time interval between the first time interval and the third time interval.

5. The RFID reader of claim 3, wherein the controller sets the interrogation time interval as the first time interval.

6. The RFID reader of claim 1, wherein the sources other than the RFID reader comprises an energy source from an antenna separate from the RFID reader.

7. The RFID reader of claim 1, wherein the sources other than the RFID reader comprises a transducer producing an ultrasonic wave.

8. A system comprising:

an RFID reader comprising;

a first ultrasonic transducer to output an ultrasonic wave, and

an antenna to transmit a low power RF signal;

an RFID tag comprising;

a second ultrasonic transducer to receive the ultrasonic wave which powers the RFID tag,

an antenna to produce backscatter in response to receiving the low power RF signal while the RFID tag is powered using the ultrasonic wave.

9. An RFID reader comprising:

an antenna that sends interrogation signals to an RFID tag at first time intervals, wherein the RFID tag harvests energy from a source other than the RFID reader;

a controller that;

identifies responses received from the RFID tag in response to the interrogation signals sent to the RFID tag,

in response to a determination that the RFID tag responded to all of the interrogation signals, the controller increases the first time interval to a second time interval;

sets an interrogation signal interval of the RFID reader to the second time interval so that the antenna the interrogation signals are sent at the second time intervals.

10. The RFID reader of claim 9, wherein the controller determines if the RFID tag has not responded to each of the interrogation signals sent by the RFID reader using the second time interval.

11. The RFID reader of claim 10, wherein the controller decreases the first time interval to a third time interval so that the interrogation signals sent to the RFID tag are sent at a lower frequency.

12. The RFID reader of claim 10, wherein the controller sets the interrogation time interval as the first time interval in response to the controller determining that the RFID tag has not responded to each of the interrogation signals sent by the RFID reader using the second time interval.

13. The RFID reader of claim 10, wherein the controller sets the interrogation time interval as the second time interval in response to the controller determining that the RFID tag has responded to each of the interrogation signals sent by the RFID reader using the second time interval.