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 has to decide if you should classify them in accordance with the physical property they normally use (like piezoelectric, photovoltaic, etc.) or based on the function they perform (such as measurement of length, temperature, etc.). Inside 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, 2 kinds of Multi Axis Load Cell, if one has to examine separate sections on resistive, thermoelectric and semiconductor devices to create the comparison.
Alternatively, to try and differentiate devices by function often is commonly a rather boring catalogue of numerous unrelated devices. The main thing about them is signals are transformed from one form to a different. It is additionally possible to discuss Torque Transducer through the functional viewpoint, under headings like length, temperature, etc., suitable for somebody who actually wants to select or make use of a sensor for the application as opposed to just read across the subject.
The words ‘sensors’ and ‘transducers’ are generally widely used inside the description of measurement systems. The first kind is popular in the united states whereas the latter is more often used in Europe. Deciding on a words in science is pretty important. In recent years there has been a propensity to coin new words or misuse (or misspell) existing words, and this may lead to considerable ambiguity and misunderstanding, and has a tendency to diminish the preciseness of the language. The challenge has become very apparent inside the computer and microprocessor areas, where preciseness is extremely important, and may seriously confuse persons entering the subject.
The phrase ‘sensor’ is derived from sentire, meaning ‘to perceive’ and ‘transducer’ comes from transducere meaning ‘to lead across’. A dictionary definition Chambers Twentieth Century of ‘sensor’ is ‘a device that detects a big difference in a physical stimulus and turns it right into a signal which may be measured or recorded’; a corresponding concept of ‘transducer’ is ‘a device that transfers power from a single system to a different inside the same or perhaps in different form’.
A sensible distinction is to apply ‘sensor’ for that sensing element itself, and ‘transducer’ for your sensing element plus any associated circuitry. For instance, thermistors are sensors, given that 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 improvement in voltage, since the complete circuit then transduces from the thermal towards the electrical domain. A solar cell is both a sensor and a transducer, as it responds to a stimulus (creates a current or voltage responding to radiation) as well as transducer from the radiant to the electrical domain. It does not require any associated circuitry, though in practice an amplifier would usually be utilized. All transducers thus contain a sensor, and many (though not all) sensors will also be transducers.
The difference is rather small, and once one actually utilizes a sensor (by applying capability to it) it might be Jr S Beam Load Cell. An interesting classification of devices can be accomplished by considering the various hdjjdy of energy or signal transfer.
The term ‘actuate’ means ‘to put in, or incite to, action’ and actuators are devices that produce the display or observable output in a measurement system like a light-emitting diode (LED) or moving coil meter. They are needless to say transducers utilized for output purposes, given that they transduce from one domain to another (ie. electrical to radiant for LEDs).