Deutsche Forschungs- Und Versuchsanstalt Fur Luft- Und Raumfahrt E.v.

Rudiger K Rodloff

Werner W Jungbluth

Dieter H Laschinski

Rolf Gauert

Hans Bentlage

Gerald H Siol

A ring laser for a ring laser type of gyro having a block with an optical resonator cavity therein and three corner mirrors and an amplifier element for optical frequencies. The amplifier element is adjustable and alignable with respect to the block in such a way that it is adaptable mechanically to the beam path resulting from the mirror arrangement determined by the production technology. The production depends basically on arranging the mirrors in such a way that a resonant beam path results. As tolerances with regard to the accuracy of the position of the amplifier element are considerably lower than those with regard to the positions of the mirrors, the position of the amplifier element is specified.

Ring laser, in particular for a ring laser type of gyro, having a block

A ring laser particularly for a ring laser type of gyro in which the ring ser includes three corner mirrors and a separate gas discharge tube arranged in a recess in a block. The gas discharge tube is mounted on the block longitudinally of the beam path by at least one piezo electric drive. The modulation amplitude of the separated beam portion is measured by a control circuit and is converted into a high voltage adjustment signal for the drive as a function of the modulation amplitude. Two drives may be spaced apart in the longitudinal direction of the gas discharge tube and these can be controlled independently of each other. Although the beam path may be displaced as a result of thermal expansion and/or bending of the block, the gas discharge tube may be kept exactly coaxial with the beam which traverses it.

Ring laser, particularly for a ring laser type of gyro

The rotational vibration drive consists of a first plate attachable to a ed baseplate and a second plate attachable to a clamping plate for the ring laser block. The first and second plates are arranged side by side in the same plane. A torsionally stiff rotational spring linkage joins the first and second plates and has a rotational axis perpendicular to the plane of the beam path of the ring laser. The first and the second plates together with the rotational spring linkage are of unitary construction. Two slots originating from the rotational spring linkage extend between the first and the second plates. A piezoceramic stack drive is arranged in mutually-aligned holes in the first and second plates and acts between the said first and second plates, the axis of the piezoceramic stack drive being positioned centrally in height between surfaces of the first and second plates.

Rotational vibration drive for a ring laser gyroscope

A piezoceramic servo-drive for producing translational and angular moveme especially for application to ring laser mirrors, and including piezo discs arranged in a column. The discs are polarised in such a way that the direction of extension of the column and the direction of the electrical field lie in parallel. The discs are provided on one side with a complete contact surface and on the other side are divided into electrically separate contact segments which are provided with separate electrical connections.

Piezoceramic servo-drive for producing translational motion, especially

A ring laser, especially for a ring laser type of gyro, comprising a block roduced from a thermally and mechanically highly-stable ceramic glass and three corner mirrors. At least one of the mirrors can be tilted about an axis by a servo-drive and one of the mirrors is a semi-transparent separating mirror, behind which is arranged a photo-detector in the beam path of the separated beam portion of one of the rotating wave trains. The photo-detector may at least be one photo-diode which is arranged in such a way that it gives an output signal proportional to the position of the beam, as a function of which an adjustment signal is formed for the servo-drive of the tiltable mirror. Two photo-diodes can be provided alongside or on top of each other in the plane of the beam. The photo-diodes are in the form of a differential photo-diode. In order to eliminate errors, one of the corner mirrors is tiltable about an axis perpendicular to the plane of the beam path.

Ring laser, especially for a ring laser type of gyro

A sensor of rotational velocity on the basis of a ring laser having an external radiation path including one corner mirror of the active resonance space which is transparent to the radiation of the active resonance space and at least two corner mirrors in the external radiation path between which there is arranged a magnetically excited body consisting of a material with a magnetooptical effect to act as a bias element for the production of a phase shift. The corner mirror of the active resonance space which leads to the external radiation path has a transparency of at maximum 5% and the magnetically excited body consists of a material which can be magnetized to saturation. The body is, preferably, a Faraday cell which is constructed from a ferromagnetic compound, in particular a garnet compound.

Sensor of rotational velocity on the basis of a ring laser

An angular velocity sensor based on a ring laser, wherein at any given time beam components of oppositely directed wave trains can be decoupled, having photo-receivers for the decoupled beam components, and means for the generation of signals which correspond to intensity differences of the decoupled beam components. In accordance with the invention a photo-receiver is provided for each decoupled beam and detector means is provided to analyze the output signals from the photo-receivers both for amplitude and frequency. The detector means may consist of a subtractor, a pulse-former and a counter. A rotation-direction detector may also receive an output signal from the pulse-former and feed this as a plus or minus sign into the counter.

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Meinersen, Germany

Rudiger K Rodloff