When talking aerospace sensors, ‘analogue’ or ‘digital’ become hardly necessary, being simply a matter of approach to operation, and that it is the actual physical principles which are all-important.
Classification of sensors. In discussing sensing devices one must decide whether or not to classify them based on the physical property they use (including piezoelectric, photovoltaic, etc.) or in accordance with the function they perform (such as measurement of length, temperature, etc.). In the former case you can present a reasonably integrated take a look at the sensing process, yet it is a bit disconcerting when one would like to compare the merits of, say, 2 kinds of Multi Axis Force Sensor, if one must examine separate sections on resistive, thermoelectric and semiconductor devices to make the comparison.
Alternatively, to attempt to differentiate devices by function often tends to be a rather boring catalogue of numerous unrelated devices. The important thing on them is signals are transformed from one form to another. It is additionally easy to discuss Torque Transducer from your functional viewpoint, under headings including length, temperature, etc., appropriate for someone who actually would like to select or utilize a sensor for the application as opposed to just read across the subject.
The text ‘sensors’ and ‘transducers’ are generally popular within the description of measurement systems. The first kind is popular in the us whereas the latter is more often utilized in Europe. The choice of words in science is rather important. Recently there has been a tendency to coin new words or even to misuse (or misspell) existing words, and this may lead to considerable ambiguity and misunderstanding, and tends to diminish the preciseness of the language. The issue has been very apparent inside the computer and microprocessor areas, where preciseness is especially important, and will seriously confuse persons entering the topic.
The word ‘sensor’ hails from sentire, meaning ‘to perceive’ and ‘transducer’ originates from transducere meaning ‘to lead across’. A dictionary definition Chambers Twentieth Century of ‘sensor’ is ‘a device that detects a big change in a physical stimulus and turns it right into a signal which is often measured or recorded’; a corresponding concept of ‘transducer’ is ‘a device that transfers power from one system to another one within the same or even in different form’.
A smart distinction is by using ‘sensor’ for the sensing element itself, and ‘transducer’ for the sensing element plus any associated circuitry. As an example, thermistors are sensors, since they react to a stimulus (changes its resistance with temperature), only become transducers when connected in a bridge circuit to convert change in potential to deal with alternation in voltage, since the complete circuit then transduces through the thermal for the electrical domain. A solar cell is both a sensor as well as a transducer, because it responds to some stimulus (produces a current or voltage in reaction to radiation) as well as transducer from the radiant towards the electrical domain. It does not require any associated circuitry, though in reality an amplifier would usually be utilized. All transducers thus have a sensor, and lots of (though not all) sensors can also be transducers.
The difference is pretty small, and once one actually works with a sensor (by making use of power to it) it becomes S Type Load Cell. A fascinating classification of devices may be accomplished by considering the various hdjjdy of energy or signal transfer.
The phrase ‘actuate’ means ‘to put into, 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. These are of course transducers utilized for output purposes, given that they transduce in one domain to another one (ie. electrical to radiant for LEDs).