Kistler Holding Ag

Dieter Karst

Paul Furter

Peter Wolfer

Claudio Cavalloni

Kurt Vollenweider

Stefan Brechbühl

Stefan Brechbuehl

A method is provided for connecting a diaphragm to a housing of a pressure or force sensor, wherein a measurement element is attached in the housing and can capture a load acting from the outside onto the diaphragm during the use of the finished sensor. A housing ring surface or the housing is situated opposite a diaphragm ring surface of the diaphragm, which are subjected to compressive loading by the load during use of the sensor. A first connection is produced in an inner region between the housing ring surface and the diaphragm ring surface until they rest against each other radially outside the first connection. Then a second connection connects the housing ring surface and the diaphragm ring surface to one another radially outside the first connection up to a shared outer edge. Here, a defined connection depth of the entire double connection is maintained.

Method for connecting a diaphragm to a sensor housing

A spark plug has an optical window for sensing combustion processes in an Otto engine. The optical window is located in the central electrode of the spark plug and has at least one lens exposed to the combustion chamber, as well as at least one flexible optical fiber which can conduct light through the spark plug from the lens to an analysis system.

Spark plug with optical sensor

An acceleration-compensated pressure pick-up, for example for the measurement of dynamic processes in gaseous or liquid media, comprises an external housing and a pre-assembled inner part having a flange at its assembly end. The inner part is securely fixed to the housing only at the flange. A first mass is connected via a first resilient connection to the flange, and a second mass is connected to the flange via a second resilient connection. A first measurement crystal is inserted under pre-tension between the two masses. A third mass and a compensation crystal are arranged between the first measurement crystal and the second mass, and the compensation crystal is electrically connected in opposition to the first measurement crystal. The two rigidities of the resilient connections and the three masses are matched so that the measurement values which can be determined at the crystals due to an axial acceleration acting on the housing compensate each other.

Pressure sensor with active and passive acceleration compensation

The invention relates to an optical sensor for detecting light emission in combustion processes in a combustion chamber. At least one lens of the sensor faces the combustion chamber and is disposed on the tip of the sensor. The inventive sensor is provided with a heating device, which is disposed on the tip thereof, in the region of the front lens. The heating device can be a wire coil, a laser or a conduit with heated fluid. The sensor can include a controller for controlling the temperature of the heating device so that the tip of the sensor can be heated by the heating device to a specific temperature at which any soot on the front lens is combusted. As a result, the sensor remains clean and operational during the entire measuring period as desired.

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Stein am Rhein, Switzerland

Dieter Karst