An inertial force sensor may comprise: a base; a first block including an inclined surface that is inclined with respect to a base surface; a second block including an inclined surface that is inclined with respect to the base surface; a third block including an inclined surface that is inclined with respect to the base surface; a fourth block including an inclined surface that is inclined with respect to the base surface; and a connector configured to physically connect the first, second, third, and fourth blocks. In this inertial force sensor, the first and second blocks are aligned along a first direction parallel to the base surface with their inclined surfaces both facing inward or outward, and the third and fourth blocks are aligned along a second direction parallel to the base surface and orthogonal to the first direction with their inclined surfaces both facing inward or outward.

An electrically-driven gyroscope having a housing capable of alternate rotation and a control method thereof, which relate to the field of electrically-driven gyroscopes. The electrically-driven gyroscope includes a rotating housing, an internal rotator, a drive motor composed of an electrical stator part and a rotating part, a drive circuit, and a battery. The internal rotator is mechanically connected to the rotating part of the drive motor, and they can coaxially rotate. The electrical stator part of the motor, the drive circuit, and the battery are mutually electrically connected, and are all connected inside the rotating housing.

An electrically-driven gyroscope having a housing capable of alternate rotation and a control method thereof, which relate to the field of electrically-driven gyroscopes. The electrically-driven gyroscope includes a rotating housing, an internal rotator, a drive motor composed of an electrical stator part and a rotating part, a drive circuit, and a battery. The internal rotator is mechanically connected to the rotating part of the drive motor, and they can coaxially rotate. The electrical stator part of the motor, the drive circuit, and the battery are mutually electrically connected, and are all connected inside the rotating housing.

The present invention relates generally to the field of inertial measurement units (IMU's) and their use in downhole applications and particularly to an IMU configured to allow a calculation of bias or drift, an encoder steering assembly and a drilling target indicator to calculate position of a downhole implement relative to an intended path.

A vibration measurement system comprises an image capturing apparatus, a distance measuring apparatus, a sensor that outputs a signal according to an inclination of the image capturing apparatus relative to the vertical direction, and a vibration measurement apparatus. The vibration measurement apparatus includes calculating an angle formed by the normal of an image capturing surface of the image capturing apparatus and the normal of the measurement target surface that the image capturing apparatus shoots, based on the signal output by the sensor, converting the image obtained that the image capturing apparatus shoots into an image that would be obtained were the normal of the measurement target surface coincident with the normal of the image capturing surface of the image capturing apparatus, using the calculated angle, and measuring vibration of the structure, using the converted image and the measured distance from the image capturing apparatus to the measurement target surface.

A controller unit is included in a liquid-pressure driving system for use in a working machine configured to supply an operating liquid to an actuator to move a structural body by the actuator. The controller unit includes: a gyro sensor configured to output a signal corresponding to an operation velocity of the structural body; and a controller configured to control a flow rate of the operating liquid supplied to the actuator, based on the signal output from the gyro sensor and corresponding to the operation velocity of the structural body, wherein: the controller is attached to the structural body; and the gyro sensor is incorporated in the controller.

The invention relates to an inertial sensor (1) comprising a substrate extending along a drive excitation direction (x) and a detection direction (y) normal to each other, the device plane being perpendicular to a rotation direction (z), a first drive frame (110) and a second drive frame (120), a first sense frame (210), a second sense frame (220), a sense lever (1000) pivotably mounted around a rotation axis (1001), a sensing system comprising a strain gauge (1600) mechanically stressed by the sense lever it is rotating around the rotation axis. The sense lever includes a central portion (1500), a first arm (1100) and a second arm (1200), the central portion having a dimension along the detection direction called central width, the arms having a dimension along the detection direction called arm width, the central width being at least twice greater than the arm width.

The invention relates to an inertial sensor (1) comprising a substrate extending along a drive excitation direction (x) and a detection direction (y) normal to each other, the device plane being perpendicular to a rotation direction (z), a first drive frame (110) and a second drive frame (120), a first sense frame (210), a second sense frame (220), a sense lever (1000) pivotably mounted around a rotation axis (1001), a sensing system comprising a strain gauge (1600) mechanically stressed by the sense lever it is rotating around the rotation axis. The sense lever includes a central portion (1500), a first arm (1100) and a second arm (1200), the central portion having a dimension along the detection direction called central width, the arms having a dimension along the detection direction called arm width, the central width being at least twice greater than the arm width.

A vibration measurement system comprises an image capturing apparatus, a distance measuring apparatus, a sensor that outputs a signal according to an inclination of the image capturing apparatus relative to the vertical direction, and a vibration measurement apparatus. The vibration measurement apparatus includes calculating an angle formed by the normal of an image capturing surface of the image capturing apparatus and the normal of the measurement target surface that the image capturing apparatus shoots, based on the signal output by the sensor, converting the image obtained that the image capturing apparatus shoots into an image that would be obtained were the normal of the measurement target surface coincident with the normal of the image capturing surface of the image capturing apparatus, using the calculated angle, and measuring vibration of the structure, using the converted image and the measured distance from the image capturing apparatus to the measurement target surface.

Embodiments of a spherical momentum control device are provided. In one embodiment, the spherical momentum control device includes a housing assembly bounding a cavity, a rotor support axle disposed within the cavity, and a spherical bearing interface formed between the rotor support axle and the housing assembly. The spherical bearing interface facilitates rotation of the rotor support axle within the cavity about three orthogonal axes transecting substantially at the cavity center point. A rotor is mounted to the rotor support axle (e.g., through precision bearings) for rotation about a spin axis. The spherical bearing interface can assume any form for facilitating rotation of the rotor support axle about the orthogonal axes including, for example, a low friction plane bearing interface. In one embodiment, the spherical bearing interface includes rolling element bearings embedded in the cavity walls or embedded in enlarged end caps forming part of the rotor support axle.