Patent US3838595A successfully refreshed from Google Patents.
US3838595A
Expired / Lapsed
US
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Data acquisition circuit for a magnetostrictive digital thin film sensor
Assignee: Lignes Telegraphiques et Telephoniques LTT SA
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Filing: 1973-03-16
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Granted: 1974-10-01
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Expires: 1993-03-16
Abstract
Abstract A sensor with a digital electrical output based on the rotation of the axis of magnetization in a thin magnetostrictive film under the influence of a stress not colinear with said axis. The new orientation of the magnetization axis is detected by means of a pulsed step-by-step rotating interrogating magnetic field established by a printed circuit interrogating lead. When such field crosses the perpendicular to the magnetizaton axis, the binary signal induced in a printed read circuit switches from a first binary value to the second value. The count of the binary read pulses before switch over is a measure of the angular position of the magnetization axis.
Inventors
- 👤 J Godefroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:14
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/0885; G01L; G01L1/00; G01L1/12; G01L1/125; G01R; G01R33/00; G01R33/12; G01R33/1215; G01R33/18; Y; Y10; Y10S; Y10S73/00; Y10S73/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
A magnetostrictive stress sensor having a digital output signal comprising: a substrate; a common return conductor deposited on one face of said substrate; a thin localized magnetic film deposited on the opposite face of said substrate; conductive sensing means printed on said film; a first dielectric film overlying and contacting said magnetic film and sensing means; a first conductive interrogating means printed on said first dielectric film; a second dielectric film overlying and contacting said first interrogating means; a second conductive interrogating means printed on said second dielectric film; a third dielectric film overlying and contacting said second interrogating means; electrical generating means connected to supply interrogating signals to said first and second interrogating means; and receiving means connected to said sensing means.
Claim 2
Dependent Claim
123 words
A magnetostrictive stress sensor having a digital output signal comprising: a substrate; a common return conductor deposited on one face of said substrate; a thin localized magnetic film deposited on the opposite face of said substrate; conductive sensing means printed on said film; a first dielectric film overlying and contacting said magnetic film and sensing means; a first conductive interrogating means printed on said first dielectric film; a second dielectric film overlying and contacting said first interrogating means; a second conductive interrogating means printed on said second dielectric film; a third dielectric film overlying and contacting said second interrogating means; electrical generating means connected to supply interrogating signals to said first and second interrogating means; and receiving means connected to said sensing means.
Claim 3
Dependent Claim
66 words
A stress sensor as defined by claim 1 in which said first and second interrogating means comprise two mutually perpendicular conductors with their crossing points overlying said magnetostrictive film and in which said sensing means comprises a hair pin shaped printed conductor one of the two legs of which passes in alignment with said crossing point and is oriented at substantially 45* to said interrogating conductors.
Claim 4
Dependent Claim
36 words
A stress sensor as defined by claim 1 in which said electrical generating means comprises a source of pulsed current amplitude modulated by two synchronized sinusoidal signals which are 90* out of phase with each other.
Claim 5
Dependent Claim
27 words
A stress sensor as defined by claim 3 including a circuit connected to said sensing means, said circuit including a double gate and an RS triggered switch.
References Cited (Backward Citations)
US3229512A
Cited
DE1297890B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |