Browse Prior Art Database

THE SERIAL NOTCH AUTOMATIC IDENTIFICATION SYSTEM

IP.com Disclosure Number: IPCOM000006883D
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2002-Feb-08
Document File: 2 page(s) / 91K

Publishing Venue

Motorola

Related People

Steve Hershey: AUTHOR

Abstract

Automatic Identitication is the process of automati- Fiie 1 shows an overview of the Serial Notch Auto- cally associating a unique identitication code with a part. matic Identification System. A series of notches of vary- This is most often done by detecting a feature inscribed ing depths are inscribed in the part. The notches encode in the part or reading a tag attached to the part. Although an identification number which uniquely identities the barcode-label based automatic identitication systems are part. The notches do not have to be rectangular-many the most common, these systems often suffer from other shapes are also possible, such as circular, square, unacceptably high error rates and are diicult to suc- or elliptical. As the part moves through the reader, the cessfully apply when the part is subjected to harsh envi- analog displacement sensor provides a voltage propor- ronments. The new automatic identification system tional to the depth of each notch. After all notches have presented in this paper is an alternative to barcode-based been read, the notch depths are turned into the bit pat- systems. tern which represents the part identification number.

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MO-LA INC. Technical Developments Volume 19 June 1993

THE SERIAL NOTCH AUTOMATIC IDENTIFICATION SYSTEM

by Steve Hershey

INTRODUCTION PRINCIPLE OF OPERATION

  Automatic Identitication is the process of automati- Fiie 1 shows an overview of the Serial Notch Auto- cally associating a unique identitication code with a part. matic Identification System. A series of notches of vary- This is most often done by detecting a feature inscribed ing depths are inscribed in the part. The notches encode in the part or reading a tag attached to the part. Although an identification number which uniquely identities the barcode-label based automatic identitication systems are part. The notches do not have to be rectangular-many the most common, these systems often suffer from other shapes are also possible, such as circular, square, unacceptably high error rates and are diicult to suc- or elliptical. As the part moves through the reader, the cessfully apply when the part is subjected to harsh envi- analog displacement sensor provides a voltage propor- ronments. The new automatic identification system tional to the depth of each notch. After all notches have presented in this paper is an alternative to barcode-based been read, the notch depths are turned into the bit pat- systems. tern which represents the part identification number.

Voltage proportional to depth of notch

Analog Displacement

Notches of varylng depths

I Direction of Motion P

Figure 1. Serial Notch System Overview

ditferent notch depths. The designer must select the nom- her of bits per notch so that the identitication is performed reliably. The speed of the part through the reader, the sample rate of the analyzer, the resolution of the analog displacement sensor, and the sensor output signal-to- noise ratio must be considered.

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