US4011758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetostrictive pressure transducer
Assignee: Texas Instruments Inc
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Filing: 1975-10-17
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Granted: 1977-03-15
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Expires: 1995-10-17
Abstract
Abstract A magnetostrictive pressure transducer is disclosed wherein pressure in the range of zero to 1000 psi can be accurately measured. The pressure transducer apparatus includes a diaphragm causing the pressure to be applied unidirectionally on sensor material having the property of undergoing changes in magnetic induction when a pressure is applied thereto, the change in magnetic induction being related to the applied pressure. The change in magnetic induction is measured and thus provides a measurement of the applied pressure.
Inventors
- 👤 Arthur L. Reenstra
- 👤 George Trenkler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:05
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/16; Y; Y10; Y10S; Y10S73/00; Y10S73/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
100 words
A system for measuring pressure comprising: a. means including an element responsive to the application of a force thereto for causing a change in magnetic inductance of the element proportional to said force; b. force directing means for directing said force applied to the element along a single axis of the element; c. a voltage divider comprising a temperature responsive resistor serially connected to a winding, the winding magnetically coupled to said element; d. means to energize the winding for creating a magnetic field; and e. means coupled to the junction of the voltage divider for detecting an output signal.
Claim 2
Independent Claim
100 words
A system for measuring pressure comprising: a. means including an element responsive to the application of a force thereto for causing a change in magnetic inductance of the element proportional to said force; b. force directing means for directing said force applied to the element along a single axis of the element; c. a voltage divider comprising a temperature responsive resistor serially connected to a winding, the winding magnetically coupled to said element; d. means to energize the winding for creating a magnetic field; and e. means coupled to the junction of the voltage divider for detecting an output signal.
Claim 3
Dependent Claim
16 words
A system according to claim 1 wherein the element and the winding comprise a magnetostrictive transducer.
Claim 4
Dependent Claim
16 words
A system as set forth in claim 1 wherein said force directing means comprises a diaphragm.
Claim 5
Dependent Claim
15 words
A system as set forth in claim 2 wherein said second means is a diaphragm.
Claim 6
Dependent Claim
31 words
A system as set forth in claim 1 wherein the voltage divider forms a leg of a bridge circuit, and including means for applying a calibrating force to said first means.
Claim 7
Dependent Claim
22 words
A system as set forth in claim 5 wherein a second leg of the bridge comprises capacitor and resistor as a reference.
Claim 8
Dependent Claim
26 words
A system as set forth in claim 1 in which the winding is a primary and further including a secondary winding magnetically coupled to said element.
Claim 9
Dependent Claim
46 words
A system as set forth in claim 1 further including a second element responsive to the application of a force thereto for causing a change in magnetic inductance of the second element proportional to said force and a second winding magnetically coupled to said second element.
Claim 10
Dependent Claim
20 words
A system as set forth in claim 1 wherein the means for detecting the output signal comprises an asymmetrical detector.
Claim 11
Dependent Claim
20 words
A system as set forth in claim 1 wherein the means for detecting the output signal comprises a differential amplifier.
Claim 12
Independent Claim
118 words
A system for measuring pressure comprising: a. means including an element responsive to the application of a force thereto for causing a change in magnetic inductance of the element proportional to said force; b. force directing means for directing said force applied to the element along a single axis of the element; c. a voltage divider comprising a resistor serially connected to a winding, the winding magnetically coupled to said element and formed of material having a resistance which varies with temperature over a selected operating range to provide ambient compensation; d. means to energize the winding for creating a magnetic field; and e. means coupled to the junction of the voltage divider for detecting an output signal.
Claim 13
Independent Claim
118 words
A system for measuring pressure comprising: a. means including an element responsive to the application of a force thereto for causing a change in magnetic inductance of the element proportional to said force; b. force directing means for directing said force applied to the element along a single axis of the element; c. a voltage divider comprising a resistor serially connected to a winding, the winding magnetically coupled to said element and formed of material having a resistance which varies with temperature over a selected operating range to provide ambient compensation; d. means to energize the winding for creating a magnetic field; and e. means coupled to the junction of the voltage divider for detecting an output signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |