TRANSDUCER SYSTEM

• US 3,623,046 A
• Filed: 11/05/1969
• Issued: 11/23/1971
• Est. Priority Date: 10/05/1965
• Status: Expired due to Term

• Current Assignee: Katema LLC
• Original Assignee: George Scourtes
• Inventors: Scourtes, George
• Primary Examiner(s): Habecker, Thomas B.
• Application Number:
  US04/871,020
• Time in Patent Office: 748 Days
• Field of Search: 340/199,196,195
• US Class Current: 340/870.35
• CPC Class Codes: G01F 1/24 with magnetic or electric coupling to the indicating device
• CPC Class Codes: G01L 9/0026 Transmitting or indicating the displacement of flexible, deformable tubes by electric, electromechanical, magnetic or electromagnetic means G01L9/0008 takes precedence

Abstract

A circuit for energizing a differential inductor transducer uses rectifier voltage dividers in a balanced bridge circuit.

Claims

1. In combination with a bidirectional transducer for converting a varying characteristic of a fluid into mechanical movement having a support member, first and second series connected flux producing coils mounted on the support member and an armature member supported in the flux path of the flux coils and relatively movable with respect thereto in response to the varying characteristic and producing a signal, the movement of the armature in one direction increasing the reluctance of said first coil flux paTh and correspondingly decreasing the reluctance of said second coil flux path, energy means for energizing the first and second coils with a source of alternating current potential and producing a voltage drop across each of said first and second coils in accordance with the position of the armature means, the improvement comprising first rectifying voltage divider means connected to said energy means for producing a first unidirectional reference from a first half wave of the alternating current potential, second rectifying voltage divider means connected to said energy means for producing a second unidirectional reference voltage from a second half wave of the alternating current potential, and means for doubling the magnitude of the signal comprising the difference in voltage between the voltage drop across said first coil during the first half wave and said first reference signal and a second signal comprising the difference in voltage between the voltage drop across said second coil during the second half wave and said second reference signal and indicating means responsive to the successive first and second doubled signals for indicating the fluid characteristic.

2. The invention of claim 1 wherein said first and second rectifier voltage divider means includes first and second series connected impedance means connected across the source of energy, third impedance means connected in shunt relation to said first and second impedance means, and means connected to a point between said first and second impedance means and variably connected to said third impedance means for varying the effective ratio of a combination of said first impedance means and a first preselected portion of said third impedance means as compared to a combination of said second impedance means and a second preselected portion of said third impedance means.

3. In combination with a bidirectional transducer for converting a varying characteristic of a fluid into mechanical movement having a support member, first and second series connected flux producing coils mounted on the support member and an armature member supported in the flux path of the flux coils and relatively movable with respect thereto in response to the varying characteristic, the movement of the armature in one direction increasing the reluctance of said first coil flux path and correspondingly decreasing the reluctance of said second coil flux path and the movement of the armature in an opposite direction decreasing the reluctance of the first coil flux path and increasing the reluctance of the second coil flux path, and energy means for energizing the first and second coils with a source of alternating current potential and producing a voltage drop across each of said first and second coils in accordance with the position of the armature means, the improvement comprising first rectifying voltage divider means connected to said energy means for producing a first unidirectional reference from a first half wave of the alternating current potential, second rectifying voltage divider means connected to said energy means for producing a second unidirectional reference voltage from a second half wave of the alternating current potential, and means for doubling the magnitude of a first signal comprising the difference in voltage between the voltage drop across said first coil during the first half wave and said first reference signal and a second signal comprising the difference in voltage between the voltage drop across said second coil during the second half wave and said second reference signal, including first storage means charged during said first half wave and discharged in series with said first signal during said second half wave, second storage means charged during said second half wave and discharged in series with said first signal during said first half wave, indicating means responsive to the successive first and second doubled signals for indicating the fluid characteristic.

4. The invention of claim 3 wherein said first and second rectifier voltage divider means includes first and second series connected impedance means connected across the source of energy, third impedance means connected in shunt relation to said first and second impedance means, and means connected to a point between said first and second impedance means and variably connected to said third impedance means for varying the effective ratio of a combination of said first impedance means and a first preselected portion of said third impedance means as compared to a combination of said second impedance means and a second preselected portion of said third impedance means.

5. A bidirectional telemetering system for converting a varying characteristic of a fluid into an indication of the signal comprising first and second series connected flux producing coils, an armature member supported in the flux path of the flux coils and relatively movable with respect thereto in response to the varying characteristic, the movement of the armature in one direction increasing the reluctance of said first coil flux path and correspondingly decreasing the reluctance of said second coil flux path, energy means for energizing the first and second coils with a source of alternating current potential and producing a voltage drop across each of said first and second coils in accordance with the position of said armature means, the improvement comprising first rectifying voltage divider means connected to said energy means for producing a first unidirectional reference from a first half wave of the alternating current potential, second rectifying voltage divider means connected to said energy means for producing a second unidirectional reference voltage from a second half wave of the alternating current potential, and means for doubling the magnitude of a first signal comprising the difference in voltage between the voltage drop across said first coil during the first half wave and said first reference signal and a second signal comprising the difference in voltage between the voltage drop across said second coil during the second half wave and said second reference signal, and indicating means responsive to the successive first and second doubled signals for indicating the fluid characteristic.

6. In combination with a bidirectional telemetering system for converting a varying characteristic of a fluid into an indication of the signal comprising first and second series connected flux producing coils, an armature member supported in the flux path of the flux coils and relatively movable with respect thereto in response to the varying characteristic, the movement of the armature in one direction increasing the reluctance of said first coil flux path and correspondingly decreasing the reluctance of said second coil flux path and the movement of the armature in an opposite direction decreasing the reluctance of the first coil flux path and increasing the reluctance of the second coil flux path, energy means for energizing the first and second coils with a source of alternating current potential and producing a voltage drop across each of said first and second coils in accordance with the position of said armature means, the improvement comprising first rectifying voltage divider means connected to said energy means for producing a first unidirectional reference from a first half wave of the alternating current potential, second rectifying voltage divider means connected to said energy means for producing a second unidirectional reference voltage from a second half wave of the alternating current potential, and means for doubling the magnitude of a first signal comprising the difference in voltage between the voltage drop across said first coil during the first half wave and said first reference signal and a second signal comprising the difference in voltage between the voltage drop across said second coil during the second half wave and said second reference signal, including first storage means charged during said first half wave and dischArged in series with said first signal during said second half wave, second storage means charged during said second half wave and discharged in series with said first signal during said first half wave, and indicating means responsive to the successive first and second doubled signals for indicating the fluid characteristic.

7. A metering system for indicating the ratio of change of the impedance of a first and second series connected flux producing coils, an armature member supported in the flux path of the flux coils and relatively movable with respect thereto to vary the ratio of the impedances and energy means for energizing the first and second coils with a source of alternating current potential and producing a voltage drop across each of said first and second coils in accordance with the position of the armature means, the system comprising first rectifying voltage divider means connected to the energy means for producing a first unidirectional reference from a first half wave of the alternating current potential, second rectifying voltage divider means connected to the energy means for producing a second unidirectional reference voltage from a second half wave of the alternating current potential, and means for doubling the magnitude of a first signal comprising the difference in voltage between the voltage drop across the first coil during the first half wave and said first reference signal and a second signal comprising the difference in voltage between the voltage drop across the second coil during the second half wave and said second reference signal, including first storage means charged during the first half wave and discharged in series with said first signal during the second half wave, second storage means charged during the second half wave and discharged in series with said first signal during the first half wave, and indicating means responsive to the successive first and second doubled signals for indicating the fluid characteristic.

8. A metering system for indicating the ratio of change of the impedances of a first and second series connected flux producing coils, an armature member supported in the flux path of the flux coils and relatively movable with respect thereto to vary the ratio of the impedance, the movement of the armature in one direction increasing the reluctance of said first coil flux path and correspondingly decreasing the reluctance of said second coil flux path and the movement of the armature in an opposite direction decreasing the reluctance of the first coil flux path and increasing the reluctance of the second coil flux path, and energy means for energizing the first and second coils with a source of alternating current potential and producing a voltage drop across each of said first and second coils in accordance with the position of the armature means, the system comprising first rectifying voltage divider means connected to the energy means for producing a first unidirectional reference from a first half wave of the alternating current potential, second rectifying voltage divider means connected to the energy means for producing a second unidirectional reference voltage from a second half wave of the alternating current potential, and means for doubling the magnitude of a first signal comprising the difference in voltage between the voltage drop across the first coil during the first half wave and said first reference signal and a second signal comprising the difference in voltage between the voltage drop across the second coil during the second half wave and said second reference signal, including first storage means charged during the first half wave and discharged in series with said first signal during the second half wave, second storage means charged during the second half wave and discharged in series with said first signal during the first half wave, said first and second storage means being oppositely charged during the respective discharge portion of the wave to a potential equal to the respective first And second signal, and indicating means responsive to the successive first and second doubled signals for indicating the fluid characteristic.