Sensor with tail or transmission line for vehicle leak testing

• US 10,546,166 B2
• Filed: 02/04/2019
• Issued: 01/28/2020
• Est. Priority Date: 11/18/2006
• Status: Active Grant

• Current Assignee: Rfmicron, Inc.
• Original Assignee: Rfmicron, Inc.
• Inventors: Rokhsaz, Shahriar, Young, Brian David
• Primary Examiner(s): Yacob, Sisay
• Application Number:
  US16/266,376
• Publication Number:
  US 20190180064A1
• Time in Patent Office: 358 Days
• CPC Class Codes: G06K 19/0716 at least one of the integrated circuit chips comprising a sensor or an interface to a sensor
• 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 7/10316 using at least one antenna particularly designed for interrogating the wireless record carriers antennas in general H01Q1/22
• CPC Class Codes: G06K 7/10346 the antenna being of the far field type, e.g. HF types or dipoles
• CPC Class Codes: G06K 7/10366 the interrogation device being adapted for miscellaneous applications
• CPC Class Codes: H03J 2200/10 Tuning of a resonator by means of digitally controlled capacitor bank
• CPC Class Codes: H03J 3/20 of single resonant circuit by varying inductance only or capacitance only
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A method includes sending, by a reader, a radio frequency (RF) signal to a wireless sensor that includes an antenna having a tail section and a head section. The tail section is for placement in an RF limited area for sensing moisture in a first location of a vehicle under test and wherein the head section is for placement in a non-RF limited area. The method further includes receiving, by the reader, an RF response to the RF signal from the wireless sensor. The first RF response includes an indication of adjustment of one or more RF characteristics of the wireless sensor, which corresponds to a variance of the one or more RF characteristics from a desired value, which, in turn, corresponds to a level of moisture at the first location. The method further includes outputting, by the reader, a message regarding the level of moisture at the first location.

Claims

1. A method comprises:

sending, by a reader, a first radio frequency (RF) signal to a first wireless sensor that includes a first antenna having a first tail section and a first head section, wherein the first tail section is for placement in a radio frequency (RF) limited area for sensing moisture in a first location of a vehicle under test, and wherein the first head section is for placement in a non-RF limited area; and

receiving, by the reader, a first RF response to the first RF signal from the first wireless sensor, wherein the first RF response includes an indication of adjustment of one or more RF characteristics of the first wireless sensor, wherein the adjustment corresponds to a variance of the one or more RF characteristics from a desired value of the one or more RF characteristics, and wherein the variance corresponds to a level of moisture at the first location;

outputting, by the reader, a message regarding the level of moisture at the first location.

2. The method of claim 1 further comprises:

sending, by the reader, a second RF signal to a second wireless sensor that includes a second antenna having a second tail section and a second head section, wherein the second tail section is for placement in a second location that is RF limited of the vehicle under test, and wherein the second head section is for placement in a non-RF limited area proximal to the second location; and

receiving, by the reader, a second RF response to the second RF signal from the second wireless sensor, wherein the second RF response includes an indication of adjustment of one or more RF characteristics of the second wireless sensor;

outputting, by the reader, a second message regarding the level of moisture at the second location.

3. The method of claim 1 further comprises:

detecting, by a processing module of the first wireless sensor, the variance of one or more RF characteristics of the first wireless sensor;

adjusting, by the processing module, a tuning circuit of the first wireless sensor in response to the detecting of the variance;

generating, by the processing module, a message regarding the adjusting of the tuning circuit; and

transmitting, by a transmitter of the wireless sensor, the message to the reader, wherein the message corresponds to the first RF response.

4. The method of claim 3, wherein the adjusting the tuning circuit comprises one or more of:

adjusting a tank circuit of the tuning circuit;

adjusting a reference circuit of the tuning circuit; and

adjusting a detector circuit of the tuning circuit.

5. The method of claim 3, wherein the detecting the variance of an RF characteristic of the one or more RF characteristics comprises:

detecting a variance of the RF characteristic of a transmission line pole of the tail section; and

detecting a variance of the RF characteristic of a transmission line anti-pole of the tail section.

6. The method of claim 3, wherein the detecting the variance of an RF characteristic of the one or more RF characteristics comprises:

detecting a variance of an impedance at a frequency;

detecting a variance of a resonant frequency;

detecting a variance of a quality factor; and

detecting a variance of a gain.

7. The method of claim 3 further comprises:

receiving, by a patch antenna portion of the first antenna, the first RF signal from the RF reader, wherein the patch antenna portion includes a pole and an anti-pole, wherein the first antenna includes an antenna ground plane and die attach area, wherein the antenna ground plane provides a ground plane for the first tail section, and wherein the die attach area is operably coupled to the processing module and the tuning circuit; and

transmitting, by the transmitter of the first wireless sensor, responses to the RF reader.