Abstract
A system designer is rarely able to connect a sensor directly to processing, monitoring, or recording instruments, unless a sensor has a built-in electronic circuit with an appropriate output format. When a sensor generates an electric signal, that signal often is either too weak, or too noisy, or it contains undesirable components. Besides, the sensor output may be not compatible with the input requirements of a data acquisition system, that is, it may have a wrong output format. To mate a sensor and a processing device, they either must share a “common value” or some kind of a “mating” device is required in-between. In other words, signal from a sensor usually has to be conditioned before it is fed into a processing device (a load). Such a load usually requires either voltage or current as its input signal.
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Notes
- 1.
A voltage comparator differs from an operational amplifier by its faster speed response and the output circuit which is easier interfaceable with digital circuits.
- 2.
See Sect. 6.3.
- 3.
A resolution should not be confused with accuracy.
- 4.
A fundamental theorem of the information theory. It is also known as Nyquist-Shannon-Kotelnikov theorem. It states that the minimum sampling must be twice as fast as the highest frequency of the signal.
- 5.
Trademark of Westinghouse Electric Corp.
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Fraden, J. (2010). Interface Electronic Circuits. In: Handbook of Modern Sensors. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6466-3_5
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