Browse Prior Art Database

High Sensitivity Galvanometer

IP.com Disclosure Number: IPCOM000090103D
Original Publication Date: 1969-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Blatty, R: AUTHOR

Abstract

Galvanometers of the type described by Condon and Marcus, Phys. Rev. 134, A446, 1964, can be modified to make them more sensitive and more sturdy. The length of suspension band 10 suspending galvanometer coil 12 from suspension bridge 14 is increased. This increases the number of degrees of torsional deflection of band 10 per unit of force transmitted to coil 12 by quartz torque transmitter 16. Swan neck-shaped beryllium-copper spring 18 connects band 10 to bridge 14. In cooperation with stop 20, spring 18 prevents band 10 from breaking if a downward force is imparted to transmitter 16. Spring 18 flexes sufficiently to allow stop 20 to impinge on U-shaped bar 22 before band 10 breaks. Thin gold ribbon loop 24 is used in place of a coil spring for connecting coil 12 to a source of electric current.

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 100% of the total text.

Page 1 of 2

High Sensitivity Galvanometer

Galvanometers of the type described by Condon and Marcus, Phys. Rev. 134, A446, 1964, can be modified to make them more sensitive and more sturdy. The length of suspension band 10 suspending galvanometer coil 12 from suspension bridge 14 is increased. This increases the number of degrees of torsional deflection of band 10 per unit of force transmitted to coil 12 by quartz torque transmitter 16. Swan neck-shaped beryllium-copper spring 18 connects band 10 to bridge 14. In cooperation with stop 20, spring 18 prevents band 10 from breaking if a downward force is imparted to transmitter 16. Spring 18 flexes sufficiently to allow stop 20 to impinge on U-shaped bar 22 before band 10 breaks. Thin gold ribbon loop 24 is used in place of a coil spring for connecting coil 12 to a source of electric current. Ribbon 24 does not apply a back force to coil 12 when it rotates. Finally, universal joint 26 is employed to prevent angular misalignment of transmitter 16 from affecting the operation of the galvanometer. This galvanometer is sensitive enough to measure very small currents induced in magnetic film 30 supported on platform 28. Measurement of these currents is a way to evaluate the electrical characteristics of film 30.

1

Page 2 of 2

2

[This page contains 1 picture or other non-text object]