摘要:
An ultrasonic flow measuring device, which determines volume and/or mass flow of a medium in a pipeline, or in a measuring tube. The flow measuring device includes a plurality of ultrasonic sensors, which emit and/or receive ultrasonic measurement signals along defined sound paths. The control/evaluation electronics of the flow measuring device is divided into an on-site electronics, in which at least one switch is provided, via which the ultrasonic sensors, arranged in different sound paths, can be driven and/or queried, and at least one remote, control/evaluation unit, wherein the control/evaluation unit so switches the at least one switch, that the driven and/or queried, ultrasonic sensor, or the driven and/or queried pair of ultrasonic sensors, is activated and provides measured values.
摘要:
A device for determining and/or monitoring the volume, and/or mass, flow of a medium flowing through a containment in a stream direction. The device includes: At least one ultrasonic transducer, which emits and/or receives ultrasonic measuring signals; and a control/evaluation unit, which determines the volume, and/or mass, flow of the medium in the containment on the basis of the ultrasonic measuring signals according to the travel time difference principle or the Doppler principle. A first clock-pulse generator having a first pulse rate and a second clock-pulse generator having a second pulse rate are provided, with the first pulse rate of the first clock-pulse generator being greater than the second pulse rate of the second clock-pulse generator. The control/evaluation unit operates the first clock-pulse generator intermittently. The control/evaluation unit sizes the duration of a switch-on, or measuring, phase and/or a resting phase as a function of the available energy.
摘要:
A pulse generator including a control logic operating, by control pulses, a switch connected on the input side with a voltage supply unit and delivering a pulse voltage on the output side, there is connected, between control logic and the switch, a capacitor, which decreases the pulse voltage when the pulse frequencies are too low, and, additionally, arranged between voltage supply unit and switch, an RC-member, which decreases the pulse voltages when the repetition rates of the control pulses are too high, in order to enable use of the pulse generator in the explosion-protected area.
摘要:
A sensor amplifier arrangement includes an amplifier having a signal input to receive a sensor signal and a signal output to provide an amplified sensor signal, and a feedback path that couples the signal output to the signal input and provides a feedback current that is an attenuated signal of the amplified sensor signal and is inverted with respect to the sensor signal.
摘要:
The invention relates to a method of a mass-spectrometric analysis of known mutation sites in the genome, such as single nucleotide polymorphisms (SNPs), using the method of restricted primer extension. The invention consists of the use of primers with a photocleavable linker. The linker creates a gap in a DNA strand which is almost the same size as a natural DNA building block (nucleoside). The linker forms a bridge over a base pair without inhibiting hybridization or enzymatic extension. However, the linker allows the primers to be cleaved after extension in order to obtain short DNA fragments which can be more easily detected on the mass spectrometer.
摘要:
A combustion chamber structure (1) comprising a plurality of cooling ducts (31, 41) extending in the longitudinal direction of the combustion chamber structure (1), whereby the combustion chamber structure (1) is rotationally symmetrical in relation to an axis (4) and comprised of an outer structure (11) and a base body (16) of the combustion chamber. The base body comprises ribs (25) preferably extending in the direction of the axis (4). The ribs are arranged in the peripheral direction of the combustion chamber structure and at least one first cooling duct (31) extends in the interior of the ribs.
摘要:
An amplifier arrangement has an amplifier (3) with a signal input (31), a feedback input (32) and a signal output (33). A first coupling path (FB1), which has a first impedance element (R1), connects the feedback input (32) to the signal output (33). A second coupling path (FB2) has a filter device (4), a buffer circuit (5) and a second impedance element (R2) connected in series, and connects the feedback input (32) to the signal output (33) or to the signal input (31).
摘要:
A control apparatus configured to generate correction values for compensation of disturbance signals of a sensor includes a control loop having an input to receive input values. The control loop includes circuitry configured to receive the input values and configured to produce output values based on the input values, and an evaluation device downstream from the circuitry relative to the input, which is configured to receive the output values and to convert the output values into result values. The apparatus also includes a correction device configured to receive the result values and the input values, to generate correction values based on the result values and the input values, and to provide the result values to the circuitry. The correction device includes a detection device having memory, which stores the input values in the memory based on the result values.
摘要:
Motor/gear unit for adjustment devices in motor vehicles with a base plate 2 supporting the motor/gear unit and able to fit in an opening 10 of a wall 1 separating a wet space A from a dry space B. The output 5 of gear is mounted on the wet space side A and at least the elements for the electrical contact of the electric motor 6 and where applicable a switch and/or an electronic control device 7 are mounted on the dry space side B. A seal 3 enclosing the opening 10 is mounted between the wall 1 and the base plate 2. The base plate 2 forms one unit at least with a part of the gear housing 20 and is mounted on the wall 1 from the wet space side A.
摘要:
The invention relates to an amplifier circuit (10a, 10b) for a two-wire interface, comprising a first current path (1), comprising a voltage-controlled current source (T1) having a gate (GT1), which is connected to an input connection (E1) of the amplifier circuit. A second current path (2) of the amplifier circuit comprises a voltage-controlled current source (T2), which is connected in series with the second resistor (R2). The first resistor (R1) and a parallel connection of the first and second current paths (1, 2) are connected in series between an output connection (A) and a reference voltage connection (B) of the amplifier circuit. The amplifier circuit (10a, 10b) makes it possible to adjust the gain and to provide a supply voltage and a useful signal over a common conducting track (L).