Fluid rotor motion sensor |
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| 申请号 | US12790671 | 申请日 | 1971-03-25 | 公开(公告)号 | US3831454A | 公开(公告)日 | 1974-08-27 |
| 申请人 | SINGER CO; | 发明人 | HOFFMAN J; | ||||
| 摘要 | A multipurpose sensing device is disclosed having the sensing capabilities of both a two axis rate gyro and a single axis accelerometer wherein these capabilities are achieved by measuring the displacement of a rotating body of fluid which results when the device disclosed is subjected to angular velocity rates or rectilinear accelerations. | ||||||
| 权利要求 | 1. A multipurpose sensing device for measuring angular velocity and rectilinear accelerations comprising: rotatable enclosure means including a cylindrical housing having a pair of end walls axially spaced and perpendicular to the longitudinal axis of said housing, said enclosure means having a first input axis disposed perpendicular to said longitudinal axis and a second axis disposed perpendicular to a plane formed by said longitudinal axis and said first input axis, said enclosure means further including at least one hollow, annular enclosure embedded in and projecting outwardly from one of said end walls, sAid annular enclosure opening into said cylindrical housing, stationary pickoff means, drive means for rotating said enclosure means relative to said pickoff means, and a fluid partially filling said enclosure means, said fluid being viscously coerced to rotate with said enclosure means at the same angular speed to thereby form a rotating fluid disc within said cylindrical housing, said disc being positioned at least beneath said annular enclosure, said pickoff means positioned adjacent to said hollow annular enclosure to thereby detect the displacement of said fluid within said annular enclosure in response to forces created by said angular velocity and rectilinear accelerations. 2. A device as claimed in claim 1, wherein said enclosure means further includes a second hollow annular enclosure embedded in and projecting outwardly from the other of said end walls, said second annular enclosure opening into said cylindrical housing, and wherein a second stationary pickoff means is positioned adjacent to said second annular enclosure to thereby detect displacement of said fluid within said second annular enclosure. 3. A device as claimed in claim 2, wherein said first and second hollow annular rings are composed of an electrically non-conducting material. 4. A device as claimed in claim 3, wherein said fluid is a liquid metal, and wherein said pickoff means includes electromagnetic means. 5. A device as claimed in claim 4, wherein said electromagnetic means comprises, a first transformer pair axially spaced along said longitudinal axis, said first transformer pair coacting with the fluid dispersed in said first and second annular rings, a second transformer pair axially spaced along said longitudinal axis, said second transformer pair being located diametrically opposite to said first transformer pair, said second transformer pair coacting with the fluid dispersed in said first and second annular rings, a third transformer pair axially spaced along said longitudinal axis, said third transformer pair bearing a quadrature relationship in its location to said first and second transformer pair, said third transformer pair coacting with the fluid dispersed in said first and second annular rings, and a fourth transformer pair axially spaced along said longitudinal axis, said fourth transformer pair being located diametrically opposite to said third transformer pair, said fourth transformer pair coacting with the fluid dispersed in said first and second annular rings. 6. A device as claimed in claim 5, wherein said pickoff means further comprises, a.c. voltage means, and electrical isolation means having a primary winding and a secondary winding including a first and second terminal, said a.c. voltage means being adapted to electrically drive said primary winding. 7. A device as claimed in claim 6, wherein said pickoff means further comprises, a signal generating means electrically connected to the first and second terminal of said secondary winding, said generating means comprising a first pair of bridge circuits and a first differential amplifier means, said first amplifier means coacting with said first pair of bridge circuits so as to output a first electrical signal when a first angular velocity rate is applied to said first input axis or when a rectilinear accleration is applied collinearly along said longitudinal axis, said generating means further comprising a second pair of bridge circuits and a second differential amplifier amplifier means, said second amplifier means coacting with said second pair of bridge circuits so as to output a second electrical signal when a second angular velocity rate is applied to said input axis. 8. A device as claimed in claim 7, wherein said first pair of bridge circuits includes, a first pair of bridge resistors, switch means having a first and second operating mode, and said switch means further having a pair of contacts and a pair of poles, said pair of contacts being serially connected to said pair of bridge resistors and said pair of poles of said switch means being serially connected to said first transformer pair, and wherein said first pair of bridge circuits further includes a second pair of bridge resistors, said second pair of bridge resistors being serially connected to said second transformer pair, and wherein said second pair of bridge circuits includes a third pair of bridge resistors, said third pair of bridge resistors being serially connected to said third transformer pair, and wherein said second pair of bridge circuits further includes a fourth pair of bridge resistors, said fourth pair of bridge resistors being serially connected to said fourth transformer pair. 9. A device as claimed in claim 1, wherein said drive means comprises a motor means coaxially aligned with a shaft, said shaft being rigidly attached to said enclosure means and coacting with said motor means to cause said enclosure means to rotate at a predetermined angular speed. 10. A device as claimed in claim 1, wherein said pickoff means includes a transfer means, said transfer means having a first operational position whereby said sensing device can perform as a rate gyroscope measuring velocities applied angularly about said first and second input axes, and wherein said transfer means has a second operational position whereby said sensing device can perform as an accelerometer measuring accelerations applied collinearly along said longitudinal axis. |
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