When talking aerospace sensors, ‘analogue’ or ‘digital’ become hardly necessary, being simply a matter of way of operation, and that it is the actual physical principles that are all-important.
Classification of sensors. In discussing sensing devices one must decide whether or not to classify them in accordance with the physical property they use (like piezoelectric, photovoltaic, etc.) or in accordance with the function they perform (like measurement of length, temperature, etc.). In the former case you can present a reasonably integrated look at the sensing process, but it is a bit disconcerting when one desires to compare the merits of, say, two kinds of 3 Axis Load Cell, if one has to look over separate sections on resistive, thermoelectric and semiconductor devices to create the comparison.
Alternatively, to try to differentiate devices by function often is commonly an extremely boring catalogue of numerous unrelated devices. What is important on them is signals are transformed in one form to another. It is additionally possible to discuss Rotary Torque Sensor through the functional viewpoint, under headings like length, temperature, etc., appropriate for somebody that actually desires to select or use a sensor for a particular application rather than just read round the subject.
The text ‘sensors’ and ‘transducers’ are both widely used inside the description of measurement systems. The first kind is popular in the united states whereas the second is more often used in Europe. The option of words in science is pretty important. Recently we have seen an inclination to coin new words or to misuse (or misspell) existing words, and this might lead to considerable ambiguity and misunderstanding, and tends to diminish the preciseness from the language. The issue has been very apparent within the computer and microprocessor areas, where preciseness is especially important, and can seriously confuse persons entering the subject.
The word ‘sensor’ hails from sentire, meaning ‘to perceive’ and ‘transducer’ originates from transducere meaning ‘to lead across’. A dictionary definition Chambers 20th Century of ‘sensor’ is ‘a device that detects a big difference in a physical stimulus and turns it into a signal which can be measured or recorded’; a corresponding meaning of ‘transducer’ is ‘a device that transfers power in one system to another within the same or perhaps in different form’.
A smart distinction is to use ‘sensor’ for that sensing element itself, and ‘transducer’ for your sensing element plus any associated circuitry. For instance, thermistors are sensors, given that they reply to a stimulus (changes its resistance with temperature), only become transducers when connected in a bridge circuit to transform change in potential to deal with improvement in voltage, considering that the complete circuit then transduces through the thermal to the electrical domain. A solar cell is both a sensor and a transducer, since it responds to some stimulus (produces a current or voltage in reaction to radiation) as well as transducer through the radiant to the electrical domain. It will not require any associated circuitry, though in practice an amplifier would usually be used. All transducers thus contain a sensor, and several (though not every) sensors can also be transducers.
The difference is pretty small, and the moment one actually utilizes a sensor (by applying power to it) it will become Miniature Force Sensor. An appealing classification of devices can be accomplished by taking into consideration the various hdjjdy of energy or signal transfer.
The word ‘actuate’ means ‘to put in, or incite to, action’ and actuators are devices that produce the display or observable output in a measurement system for instance a light-emitting diode (LED) or moving coil meter. They are needless to say transducers used for output purposes, given that they transduce from a single domain to a different (ie. electrical to radiant for LEDs).