Term
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Definition
| modes of encoding information |
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Term
| Nonelectrical (Data) domains |
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Definition
Physical and chemical informmation, scale position, number
Ex: lenght, density, chemical composition, intensity of light, pressure |
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Term
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Definition
| Analog domains, time domains, digital domains |
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Term
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Definition
| Information is encoded as the magnitude of: Current, Voltage, Charge |
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Term
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Definition
Information is stored as the time relationship of signal, not amplitudes/magnitudes of signal
ex: Frequency (Raman spec), pulse width, Phase |
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Term
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Definition
| Translate input signal (electric/nonelectric) into electrical ouput |
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Term
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Definition
| mathematical relationship between the electrical output and the input radiant power impinging on the transducer surface |
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Term
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Definition
convert data from electrical to nonelectrical domains.
Ex: voltmeters, alphanumeric displays, computer screens |
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Term
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Definition
| data encoded in a two level scheme: ON/OFF, Hi/Lo |
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Term
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Definition
| Binary digit, fundamental unit of information if the digital domain. |
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Term
| Serial Data/ serial coded binary data |
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Definition
data represented by binary coding on a single transmission line. for long distances
Include: count serial data and binary coded serial data |
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Term
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Definition
| data are transmitted within analytical instruments and computers by parallel data transmission. faster For short distances |
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Term
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Definition
| mechanical electrical or chemical device that identifies records or indicates a change in one of the variables in its environment |
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Term
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Definition
devices that converts information in nonelectrical domains to information in electrical domains and the converse
Ex: photodiodes, photomultipliers hall effect transducers, read out devices |
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Term
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Definition
devices capable of monitoring specific chemical species continuously and reversibly. consist of a transducer coupled with a chemically selective recognition phase
ex: ion selective electrodes, gass electrodes |
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Term
| Quartz crystal microbalance (QCM) |
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Definition
| an example of a sensor. quartz crystals oscillates at different frequency depending on its mass and shape (piezoelectric effect). adsorption of molecules on its surfaces cause frequency to change |
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Term
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Definition
| algebraic sum of currents at any point in a circuit is zero ( currents coming into a point has to equal the current going out of that point). |
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Term
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Definition
| algebraic sum of the voltages around a closed conducting path, or loop is zero ( the sum of the voltage increase has to equal the sum of the voltage decrease) |
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