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Proposed Method of Detecting Different Concentration Levels of an Identification Substance

IP.com Disclosure Number: IPCOM000010861D
Original Publication Date: 2003-Jan-28
Included in the Prior Art Database: 2003-Jan-28
Document File: 2 page(s) / 33K

Publishing Venue

Motorola

Related People

Zami Schwartzman: AUTHOR [+3]

Abstract

This paper describes a novel method of detecting the presence of a special substance which posesses certain electromagnetic qualities, for identification and authentication purposes, while dealing with the issue of varying concentration levels of the substance. It should be noted that the concentration level itself may be used as a means of identification, in addition to the electromagnetic response of the susbstance. The substance is usually incorporated into an ink, which is then used to print a mark onto the object which bears identification.

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Proposed Method of Detecting Different Concentration Levels of an Identification Substance

By: Zami Schwartzman, Gadi Shirazi, Haim Friedlander

Introduction

This paper describes a novel method of detecting the presence of a special substance which posesses certain electromagnetic qualities, for identification and authentication purposes, while dealing with the issue of varying concentration levels of the substance. It should be noted that the concentration level itself may be used as a means of identification, in addition to the electromagnetic response of the susbstance. The substance is usually incorporated into an ink, which is then used to print a mark onto the object which bears identification.

The basic functional blocks of the detection circuitry are shown in Figure 1 below.

Figure 1 – Functional Block Diagram

The transmitter (10) produces a RF pulse or series of pulses which pass through the T/R switch (20), which is in “transmit” mode, and are electromagnetically coupled to the object bearing identification/authentication (40) by means of an electromagnetic probe (30). The T/R switch (20) is then changed to “receive” mode. If the correct substance has been applied to the surface of the object, it responds with an echo pulse of electromagnetic energy having specific frequency and time characterisics. This pulse is electromagnetically coupled to the receiver (50) via the antenna switch (20) by means of the same electromagnetic probe (30). The receiver filters and amplifies the echo signal, which is then sampled and digitized by an analog-to-digital converter (60) and fed to a digital signal processor (DSP) (70), where software algorithms determine if the substance responded correctly, thus indicating that the object is authentic.

Problems To Be Solved and Known Solutions

It is difficult to control the exact concentration level of the substance which is applied to the object. Furthermore, assuming that substance deposition will be better controlled in the future, the concentration level itself could be used as an identification factor, in addition to the electromagnetic properties of the substance. Therefore, it is necessary for the detection circuitry to posess a means to deal with a wide rang...