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Specimen current results from the difference of electron beam current minus the sum of SE and BSE current. However, in the presence of gas and the ensuing ionization, it would be problematic to separate this mode of detection out of the generally operating gaseous detection device. Hence this mode, by its definition, may be considered as ...
Such applications include I-V characterizing and testing semiconductors and other non-linear devices and materials, where sourcing voltage and current source span across both positive and negative values. To accomplish this, SMUs have four-quadrant outputs. [1] For characterization purposes SMUs are bench instruments similar to a curve tracer.
Current exists in the junction without any voltage drop, up to a maximum value, called the critical current, I o. When the SQUID is biased with a constant current that exceeds the critical current of the junction, then changes in the magnetic flux, Φ, threading the SQUID loop produce changes in the voltage drop across the SQUID (see Figure 1).
In physics and in electronic engineering, dark current is the relatively small electric current that flows through photosensitive devices such as a photomultiplier tube, photodiode, or charge-coupled device even when no photons enter the device; it consists of the charges generated in the detector when no outside radiation is entering the detector.
Denote by the PFD pulse width (length of the time interval, where the PFD output is a non-zero constant), multiplied by the sign of the PFD output: i.e. = (()) for [,) and = for =. If the VCO trailing edge hits before the Ref trailing edge, then τ k < 0 {\displaystyle \tau _{k}<0} and in the opposite case we have τ k > 0 {\displaystyle \tau ...
The design of the saturable inductor current sensor is similar to that of a closed-loop Hall-effect current sensor; the only difference is that this method uses the saturable inductor instead of the Hall-effect sensor in the air gap. Saturable inductor current sensor is based on the detection of an inductance change. The saturable inductor is ...
Flat-panel detectors are a class of solid-state x-ray digital radiography devices similar in principle to the image sensors used in digital photography and video. They are used in both projectional radiography and as an alternative to x-ray image intensifiers (IIs) in fluoroscopy equipment.
The technique allows non-contact measurement where the heat of the molten metal makes contact techniques and even many non-contact techniques impractical. Nucleonic level sensors are often used in mineral crushing circuits, where an increase in gamma ray detection indicates a void, compared to being filled with ore.
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