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Rein D. Otsason added Phototransistors.tex
about 10 years ago
Commit id: d479c8ba5b638adfa04701040d955f7d75d9cd6a
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\subsubsection{Phototransistors}
Phototransistors [INSERT FIGURE] are typically bipolar NPN devices with larger base and collector areas optimized to work when exposed to light. While all transistors have some photo-effects, phototransistors generally also have a casing designed to enhance light exposure. Phototransistors function in the same general manner as regular transistors except that they do not have a base terminal connected to a voltage source. Instead, the base is exposed to light, which allows the formation of hole-electron pairs and in turn the flow of current. This flow of current is converted into voltage, which can then be used to transmit a signal to the microcontroller for analysis. Phototransistors typically produce higher current than photodiodes and work with a most visible and near infrared light sources. While these features are advantageous, phototransistors are particularly vulnerable to electric surges\cite{IHSGlobalSpecElectronics}.
