Abstract: A transducer for a vortex flowmeter is used for the volume flow measurement of gaseous, liquid and vaporous media. In order to provide a particularly robust transducer for vortex flowmeters, which is suitable for high and low flow rates of gases, vapours and liquids with high and in particular low densities and is also suitable at high temperatures and high pressures and in the case of contaminated media with a high measurement sensitivity and optimum signal detection, a one-piece vortex body with a sensor integrated therein is to be used. The one-piece, triangular or trapezoidal vortex body is provided with vertical recesses in the vicinity of its tapering side walls, so as to form a compact vortex generation area, a vortex determination area and a vortex detection area as the minimum rigidity area.

Abstract: The invention relates to an apparatus for generating signal pulses with a gear arrangement, which has at least two meshing gears and with a sensor means for detecting a gear rotation and for emitting signal pulses as a function on the detected gear rotation. According to the invention a sensor of the sensor means is located in the vicinity of the gear arrangement at a point where the sensor detects the rotation of both gears.

Abstract: An apparatus and method for use in an optical recording system in which an incident beam records data on an optical recording medium as marks and in which a return beam reflected from the medium is detected in an optical detector to provide a reflected write signal. A number of reflected write pulses of the reflected write signal are monitored in an interference detector. The peak voltage or other suitable characteristic of a reflected pulse corresponding to a mark following a relatively short land is compared to the same characteristic of another reflected pulse corresponding to a mark following a longer land. An error signal is generated based on the comparison and provides an indication of the amount of intersymbol interference (ISI) present during recording of the marks corresponding to the first and second reflected pulses.