Hall sensor

MP-suspension by automated ASTM-bulb Magnetization current by Hall-Sensor Magnetization time UV-Light intensity All Liquids (fluorescence, contamination) Process times and temperatures Function of spraying nozzles, Level of tanks Flow rates (e.g. washing, water recycling) UV-Light intensity... 

While adjusting the machine for its job the limits of the current for magnetizing the part have to be fixed as well as the magnetization time. During operation the machine will control for each part that the current-flow through the part and the time will be appropriate for a good magnetization. This is controlled by a hall sensor installed into the switch cabinet. 

FIG. 25 A diamond-based force chip composed of a pressure-sensing diaphragm, an FET, a diamond beam, and a Hall sensor. (Adapted from Ref. 104.)... 

Hall sensors can be triggered by a ferrous float in the sight glass. We have not tried this technique so cannot vouch for its viability. You will have to experiment and see if this works. 

Hall sensors are based on the Hall effect, which was discovered by E.H. Hall in 1879 (Fig. 5.7.10). If a long, flat, current-carrying conductor is placed in a magnetic field, the moving charges experience a net force mutually perpendicular to the direction of the current flow and the magnetic field. Under the influence of this Lorentz force, the electrons pile up on one edge of the conductor and the pos-... 

Magnetoresistors, similar to Hall sensors, utilize the deflection of carriers due to the Lorentz force when an external magnetic field is applied. The deflection increases the path of the carriers through the device and thus increase the electrical resis-... 

The Hall sensor utilizes the Hall effect, discovered by Edwin Hall in 1879. Fig. 7.10.3 shows the principle of the Hall sensor. 

Since for some applications the linearity even with barber-pole biasing is not sufficient, the use of compensating coils as described for the Hall sensors are necessary. In AMR devices these coils can be directly integrated above the sensing structures, so that the advantageous compact size of these elements remain [6, 7]. 

The usual lab active current probes (which also measure dc, and therefore include a Hall sensor) are usually just not suited for these high-bandwidth noise measurements. 

Besse PA, Boero G, Demierre M, Pott V, Potovic R (2002) Detection of a single magnetic microbead using a miniaturized silicon Hall sensor. Appl Phys Lett 80 4199 201... 

Alternatively, a noncontact magnetic loop array containing Hall sensors can be used to measure the current density distribution [55-57]. Each segment of this array consists of an electric conductor inducing a voltage within a ferromagnetic ring. 

This technique is also suitable for application in a stack and it does not cause any additional resistance to the system. Disadvantages are the high cost of the Hall sensors and the limited spatial resolution, since HaU sensors influence each other if the segments are too small. 

In the case of actively controlled structural dynamics, sensors may measure a variety of signals, such as accelerations (accelerometers), displacements (Hall sensors, capacitive sensors, laser interferometers, etc.), forces (force transducers), or - typically for adaptronic structures - strain or strain velocities (strain gauges, piezoelectric sensors, etc.). Most of these cases can be represented by the following sensor equation ... 

Pneumatic pump. The electric motor moves pusher plates back and forth to produce air flow to the blood pump via a closed-loop air tube. Subsequent valve movement in the blood pump complements a less than fully functional heart. Three motor hall sensors provide the input necessary to compute flic current direction and speed of pusher plate movement. Another pump hall sensor captures crossing of the pusher plates over the cenlre of the pump. 

Two emergency modes of operation are built into the system. One is triggered if there is no motor hall sensor signal input for 500 milliseconds, and the other occurs when the pump actuator does not pass the centre position in 3,000 milliseconds. 

The possibility of executing some statements is permanently determined by the hardware configuration. For example, execution of some switch-case statement is based on a control variable indicating deviation of the centre hall sensor installation position from the actual centre position of the pump. Such deviation never occurs unless one performs physical reconstruction of the pneumatic pump. 

Mediate volume transmitter. Stainless steel turbine in sapphire cups. Hall sensor... 

Wieser et al. [17] proposed the use of an array of Hall sensors with a segmented current collector and flow field for local current density measurements. The authors used unsegmented electrodes in their study. The use of numerous Hall sensors can significantly complicate the experimental setup, making experimentation expensive and tedious. Moreover, interference from neighboring segments is also possible. 

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