Brown & Sharpe Tesa Sa

Tesa Brown & Sharpe Sa

Tesa Sa

Alex Bezinge

Adriano U Zanier

Jean-Luc Bolli

Pierre Thomann

Alain Jornod

Adrian Orita

Ulf Birkner

Charles Zufferey

Christophe Moser

Portable precision caliper comprising a slide (,) and a shaft (,) each fitted with a jaw (,respectively,). The slide is further equipped with electronic means (,) which enable the distance between the jaws (,) to be displayed on an electronic display (,). The electronic means are powered by a battery (,). The shaft (,) is fitted with a magnetized scale (,) with a period of magnetization &lgr;. The electronic means (,) include a sensor (,) equipped with an array of magnetoresistive electrodes disposed opposite said scale (,). The resistance values of the magnetoresistive electrodes are a sinusoidal function of the longitudinal position of the sensor (,) along the scale (,). The set of magnetoresistive electrodes includes at least certain sets of magnetoresistive electrodes formed of at least 8 electrodes connected in series, so as to increase the electric resistance of the sets and to reduce the electricity consumption of the whole device.

Portable precision electronic caliper

Magnetoresistive sensor for high precision measurements of lengths and angles

The laser diode (11) of the electro-optical device (10) is frequency-controlled with the aid of a control module (40) comprising a rubidium cell (41) and an optical sensor (42), as well as a further module (43) for controlling the injection current and/or the temperature of the laser diode. A controlling light beam (18) is conveyed by means of a multi-mode optical fiber (14) to the rubidium cell. The optical sensor measures the intensity of the light beam transmitted by the rubidium cell and supplies a signal used by the further module for regulating the injection current and/or the temperature of the laser diode so as to stabilize the frequency of the light (16) emitted. The optical fiber is coupled to the laser module in such a way as to collect part of the light (16, 21) emitted by the front face of the laser diode and reflected by a lens (12) in front of the laser diode. The diode-lens assembly is heat controlled. Feedback in the laser diode and the power supplied to the laser diode are reduced, and the control device is simplified. The device finds application particularly in interferometry, atomic frequency oscillators, spectroscopy, and fiber optics data transmission.

Electro-optical device comprising a controlled laser diode

A linear measuring device comprising a scale fixed on a supporting structure along which a slide can slide. A transducer connected to the slide permits, in cooperation with the scale, determination of at least one coordinate of a point connected to the slide in a system of coordinates connected to the supporting structure. The transducer is fixed to the slide at three points by a mounting device having at each point a screw engaged in a partially threaded opening of a column and a spring. In acting on one of the screws at each of the said points, the spacing can be changed between the detection device and the slide. The spring keeps the spacing as large as the engagement of the screw in the said opening permits. The detection device is of the capacitive or electro-optical type and is mounted on a transducer support. The slide slides by means of rollers, part of the rollers rolling on guide surfaces belonging to the same plane as the surface of the supporting structure to which the scale is fixed.

Linear measuring device and a method of adjusting said device

The apparatus comprises a bearing plate (1), a slideway (2) and a girder (3) which are perpendicular to the bearing plane of the bearing plate, a slide (4) with tracer head (5) movable along the slideway and a drive plate (7) located in front of the slide and stabilized by guides (8, 9) independent of the slide. The plate (7) and the slide (4) are connected by balancing (10) and damping (11) springs. A drive device by cable (13) and return pulleys (15-18) which is moved by a movement generator (19) is connected to the plate (7) and is entirely supported by the girder (3) and the bearing plate (1). A counterweight (14) inserted in the circuit of the cable (13) balances the weight itself of the movable elements (4, 7). A body (63) for protection against impacts is fastened to the girder (3) and to the bearing plate (1).

Apparatus for the measurement of linear values

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Yens, Switzerland

Alex Bezinge