More infocenter topics: Thermoacoustics | Signal processing | Visualization
Über die Tordierung eines Wellensegments kann das aufgelegte Drehmoment gemessen werden. Dazu wird der Verdrehwinkel zwischen den Enden des Segments mit der Torsionssteifigkeit des Segments multipliziert. Während dem Betrieb kann der Verdrehwinkel mit der Eingangskarte IfTA AT2, in Kombination mit Inkrementalgebern oder Triggersensoren, ausgelesen werden.
Wie das Drehmoment robust und akkurat bestimmt wird, beschreiben wir in unserem Whitepaper.
ATEX certified products must meet strict quality and safety requirements for use in potentially explosive environments.
The term ATEX stands for the abbreviation of the French term "atmosphères explosibles" and is also an abbreviation for the European Directive 2014/34/EU, which aims to guarantee a uniform level of safety in the field of explosion protection.
The IfTA ChargeAmplifier is also available in an ATEX version for use in potentially explosive atmospheres.
Differential measurement is a method that is as tolerant as possible to interference radiation. The signal is transmitted on two conductors with different polarity instead of on one conductor, e.g. with normal BNC connections. It is also called symmetrical or differential signal transmission. The receiver determines the useful signal by difference formation between the two signal conductors whereby radiated interferences cancel each other out. Thus it is a transmission which is robust against interferences. Especially in charge measurement this is advantageous as the signal is very small in relation to possible interferences. It is therefore used, for example, in high-temperature sensors.
In measurement technology, galvanic isolation refers to the potential-free isolation between the measurement chain and the measurement system. It protects the measuring inputs and prevents hum loops. Particularly in the case of large machines, a different potential can exist at different measuring points of the machine. Without separation, a compensating current would flow through the measuring device to which the measurement chains are connected.
The separation can be analog or digital. Analog isolation amplifiers can easily be connected between the input of the measuring instrument and the measurement chain, but lead to increased noise. It is better to separate the input signals after they have been converted from analog to digital. A separate separation for each input channel is ideal. In the case of low-cost measurement technology, the galvanic isolation is usually missing or not implemented individually for each channel.
The IfTA input and output modules all have a galvanic isolation, for the AD4 modules even per channel.
Integrated Electronic Piezo Electric (IEPE) represents an industry standard for highly sensitive piezoelectric sensors with integrated impedance converter electronics. By means of an integrated charge amplifier, high-impedance signals of the sensor are converted into low-impedance voltage signals and can be transmitted almost loss- and interference-free over long lines. The ability to integrate supply current and sensor signal in a single coaxial cable is particularly noteworthy. This is achieved by a simple superposition of direct current as supply current and alternating current as sensor signal.
This standard is applied to sensors such as acceleration, force and pressure sensors or microphones and differs in its designation depending on the manufacturer.
ICP© (integrated circuit piezoelectric), CCLD© (constant-current line-drive), IsoTron© or DeltaTron© are some examples.
The IfTA AD4-IEPE and AD4Pro modules offer the optional software switchable IEPE power supply and can be used to power corresponding sensors or charge amplifiers such as the IfTA ChargeAmplifier.
In electrical measurement technology, a charge amplifier or charge-voltage changer serves the purpose of converting mostly small charges into a proportional voltage. For this reason, charge amplification is particularly used in areas where extremely low charge quantities have to be measured, such as in piezoelectric sensors.
The IfTA ChargeAmplifier allows the amplification of differential charge signals.
Sensor crackers ("popcorn effect") pose a particular challenge for the charge amplification of high-temperature sensors. They occur when such a sensor is heated so quickly that thermal stresses build up in the piezo element. If the material suddenly relaxes, large amounts of charge are suddenly released. In simple charge amplifiers, the so-called pyroelectric effect can also overdrive the electronics for seconds and thus effectively blind them.
The shielding of electronic devices means the separation of electrical and magnetic fields from or to these devices in order to ensure interference-free signal transmission and processing.
The input and output modules of the IfTA allow a shield to be connected and thus enable the appropriate grounding concept to be implemented.
The applied torque can be measured via the torsion of a shaft segment. For this purpose, the torsion angle between the ends of the segment is multiplied by the torsional stiffness of the segment. During operation, the torsion angle can be read out with the input module IfTA AT2 in combination with incremental encoders or trigger sensors.