Everett J Olsen

US Patent:

41656520, Aug 28, 1979

Filed:

Jun 2, 1978

Appl. No.:

5/911869

Inventors:

Everett O. Olsen - Wrentham MA
James R. La Croix - North Attleboro MA
Donald C. Simpson - Norton MA

International Classification:

7 3
G01L 708
G01L 900

US Classification:

73704

Abstract:

A differential-pressure measuring instrument includes a pair of diaphragms each subject to a respective fluid pressure. The diaphragms enclose a sealed chamber containing a fill-liquid surrounding a non-magnetic vibratable-wire which is tensioned in accordance with the applied differential pressure. A temperature compensating inductor is connected in parallel with the vibratable-wire to compensate for variationsin the vibrating frequency of the wire due to changes in the viscosity of the fill-liquid with temperature.

US Patent:

RE314161, Oct 18, 1983

Filed:

Jun 19, 1980

Appl. No.:

6/161123

Inventors:

Everett O. Olsen - Wrentham MA
Donald C. Simpson - Norton MA
David A. Richardson - Sheldonville MA

Assignee:

The Foxboro Company - Foxboro MA

International Classification:

G01L 110

US Classification:

7386259

Abstract:

A force-measuring instrument of the vibrating-wire type wherein the mechanical components are located at the force-measuring location and the vibrating wire is coupled through a two-wire transmission line to electronic circuitry at a distant location. The electronic circuitry includes means to excite the vibrating wire and to produce a d-c measurement output signal corresponding to the frequency of vibrations. The electronic circuitry further includes function-generating means to establish a closely-linear relationship between the output current and the force applied to the wire. Means also are incorporated in the electronic circuitry for adjusting the zero and span of the instrument, and this can be done without interaction between the adjustments.

US Patent:

42134781, Jul 22, 1980

Filed:

Dec 21, 1978

Appl. No.:

5/972096

Inventors:

Everett O. Olsen - Wrentham MA
Robert F. Estes - Foxboro MA
Paul W. Rezendes - New Bedford MA
George F. Williams - Rumford RI

Assignee:

The Foxboro Company - Foxboro MA

International Classification:

F15B 500
G05D 1620

US Classification:

137 85

Abstract:

An electro-pneumatic current-to-position transducer includes an electric motor having a permanent magnet for a stator and spring restrained coil pivotally suspended about the magnet for a rotor. An input current to the coil induces a mechanical rotation of the coil about the magnet which is proportional to the applied current. Fastened to the coil for rotary movement therewith is a flapper positioned to cover the nozzle of a pneumatic circuit. As current is applied to the coil, the flapper moves toward the nozzle thereby changing the back pressure in the pneumatic circuit. This change in pressure is amplified, then sensed by appropriate pressure-responsive devices and subsequently fed back to a control lever on which the nozzle is mounted, thereby repositioning the nozzle so as to maintain an essentially constant separation between the flapper and the nozzle. The pressure signal developed by this pneumatic control circuit is proportional to the applied current, and can serve as a pneumatic output signal for any of various purposes. Two embodiments of the transducer are disclosed, one arranged to convert an input current signal into a corresponding pressure output; the other adapted to receive an electrical input for proportionally controlling the position of a process control valve stem.

US Patent:

41656512, Aug 28, 1979

Filed:

Sep 19, 1977

Appl. No.:

5/834481

Inventors:

Everett O. Olsen - Wrentham MA
James R. La Croix - North Attleboro MA
Hoel L. Bowditch - Foxboro MA

Assignee:

The Foxboro Company - Foxboro MA

International Classification:

G01L 1302

US Classification:

73704

Abstract:

A differential-pressure measuring instrument comprising a main body assembly with a pair of diaphragms each subject to a respective fluid pressure. The diaphragms enclose a sealed chamber containing a fill-liquid surrounding a non-magnetic vibratable wire which is tensioned in accordance with the applied differential pressure. A magnetic field passes transversely through the wire, and electrical current is supplied to the wire by electronic circuit means to produce a vibratory force on the wire as a result of interaction between the electrical current and the magnetic field.

US Patent:

41236963, Oct 31, 1978

Filed:

Dec 15, 1975

Appl. No.:

5/641075

Inventors:

Everett O. Olsen - Wrentham MA

Assignee:

The Foxboro Company - Foxboro MA

International Classification:

G05B 501

US Classification:

318623

Abstract:

Signal-processing apparatus for use with industrial instrumentation systems and the like, and comprising memory means to maintain a signal level for long time periods without drift. An input signal level is translated into the positioning of a movable member, through the use of an actuator motor controlled by the input signal and a position feedback signal. A friction device is coupled to the movable member to hold it in any given position, thereby to serve as a memory for the input signal level. The friction device comprises a thin vane-like element which is secured to the movable member and disposed in the air-gap of a permanent magnet. The air-gap also includes a mass of tiny magnetizable particles which, under the influence of the magnetic field, engage the surfaces of the vane-like element to develop a frictional restraining force. This frictional restraint has the characteristic of being relatively low upon initial movement away from a start point, and thereafter increasing progressively to a plateau level, thereby providing superior dynamic performance particularly in a servo positioning system. Various applications are disclosed including process controllers and chart recorder systems.

US Patent:

47437529, May 10, 1988

Filed:

Jan 28, 1987

Appl. No.:

7/008209

Inventors:

Everett O. Olsen - Wrentham MA
Christopher R. Brown - Wrentham MA
Gordon W. Chitty - Norfolk MA

Assignee:

The Foxboro Company - Foxboro MA

International Classification:

G01D 528
G01L 110

US Classification:

250227

Abstract:

An optically driven, electromagnetically oscillating resonant sensor subjected to a stress force wherein the optical driving energy and the optically communicated signal generated in response to the stress force are both communicated a substantial distance along a single optical fiber. A portion of the supply energy drives the oscillatory mechanism and a portion is reflected to a frequency detector by the shuttering action of the resonant element. The device may be configured so as to be electrically driven and optically sensed, optically driven and electrically sensed, or both optically driven and optically sensed for maximum retrofit versatility in past, present, and future process control systems.

US Patent:

43299105, May 18, 1982

Filed:

Feb 8, 1980

Appl. No.:

6/119703

Inventors:

Everett O. Olsen - Wrentham MA
Robert F. Estes - Foxboro MA
Paul W. Rezendes - New Bedford MA
George F. Williams - Rumford RI

Assignee:

The Foxboro Company - Foxboro MA

International Classification:

F15B 910
F15B 13044

US Classification:

91375R

Abstract:

An electro-pneumatic current-to-position transducer includes an electric motor having a permanent magnet for a stator and spring restrained coil pivotally suspended about the magnet for a rotor. An input current to the coil induces a mechanical rotation of the coil about the magnet which is proportional to the applied current. Fastened to the coil for rotary movement therewith is a flapper positioned to cover the nozzle of a pneumatic circuit. As current is applied to the coil, the flapper moves toward the nozzle thereby changing the back pressure in the pneumatic circuit. This change in pressure is amplified, then sensed by appropriate pressure-responsive devices and subsequently fed back to a control lever on which the nozzle is mounted, thereby repositioning the nozzle so as to maintain an essentially constant separation between the flapper and the nozzle. The pressure signal developed by this pneumatic control circuit is proportional to the applied current, and can serve as a pneumatic output signal for any of various purposes. Two embodiments of the transducer are disclosed, one arranged to convert an input current signal into a corresponding pressure output; the other adapted to receive an electrical input for proportionally controlling the position of a process control valve stem.

US Patent:

41189779, Oct 10, 1978

Filed:

Oct 13, 1976

Appl. No.:

5/732129

Inventors:

Everett O. Olsen - Wrentham MA
Donald C. Simpson - Norton MA
David A. Richardson - Sheldonville MA

Assignee:

The Foxboro Company - Foxboro MA

International Classification:

G01L 110

US Classification:

73141R

Abstract:

A force-measuring instrument of the vibrating-wire type wherein the mechanical components are located at the force-measuring location and the vibrating wire is coupled through a two-wire transmission line to electronic circuitry at a distant location. The electronic circuitry includes means to excite the vibrating wire and to produce a d-c measurement output signal corresponding to the frequency of vibrations. The electronic circuitry further includes function-generating means to establish a closely-linear relationship between the output current and the force applied to the wire. Means also are incorporated in the electronic circuitry for adjusting the zero and span of the instrument, and this can be done without interaction between the adjustments.