Browse Prior Art Database

Transducer Pickup

IP.com Disclosure Number: IPCOM000086416D
Original Publication Date: 1976-Sep-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Nemier, SE: AUTHOR [+2]

Abstract

Transducer 10 provides multiple pulses in pickup coil 16 for each tooth 11 of an emitter bar 12. Emitter teeth 11 are formed in the soft iron emitter bar 12 so as to be uniformly spaced. The width of gaps 13 is equal to the width of emitter teeth 11. Transducer poles 14 or 15 are made of soft iron. The pickup coil 16 is wound on a soft iron bar 17 spaced from the transducer poles 14 and 15 by air gaps 18 and 19. The faces of the transducer poles 14 and 15 terminate in transducer teeth 20 and 21, respectively.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 57% of the total text.

Page 1 of 2

Transducer Pickup

Transducer 10 provides multiple pulses in pickup coil 16 for each tooth 11 of an emitter bar 12. Emitter teeth 11 are formed in the soft iron emitter bar 12 so as to be uniformly spaced. The width of gaps 13 is equal to the width of emitter teeth 11. Transducer poles 14 or 15 are made of soft iron. The pickup coil 16 is wound on a soft iron bar 17 spaced from the transducer poles 14 and 15 by air gaps 18 and 19. The faces of the transducer poles 14 and 15 terminate in transducer teeth 20 and 21, respectively.

A permanent magnet 22 in contact with transducer poles 14 and 15 provides a bias field. To get proper flux between teeth 11 of emitter bar 12 and teeth 20 and 21 on poles 14 and 15, the air gaps 18 and 19 are made slightly larger than air gap 23 between transducer teeth 20, 21 and emitter teeth 11.

Transducer teeth 20 and 21 are uniformly spaced. Transducer poles 14 and 15 are separated a distance so that teeth 20 and 21 are in the same alignment relative to emitter teeth 11. The pitch of transducer teeth 20, 21 is an odd number fraction of the pitch of the emitter 11. In the transducer 10 of Fig. 1, three pulses are provided in pickup coil 16 for each emitter tooth 11.

Fig. 2 shows the spacing arrangement for providing five pulses for each tooth
11. Fig. 3 shows a transducer in which the teeth 21 on pole 15 is arranged to be a mirror image of the arrangement of teeth 20 on pole 14.

The technique described does not require that emitter teet...