When talking aerospace sensors, ‘analogue’ or ‘digital’ become hardly necessary, being simply a matter of method of operation, and that it must be the actual physical principles which are all-important.
Classification of sensors – In discussing Torque Transducer one has to decide whether to classify them based on the physical property they utilize (like piezoelectric, photovoltaic, etc.) or based on the function they perform (such as measurement of length, temperature, etc.). Inside the former case anybody can present a reasonably integrated take a look at the sensing process, but it is a bit disconcerting when one desires to compare the merits of, say, two types of temperature sensors, if one must examine separate sections on resistive, thermoelectric and semiconductor devices to make the comparison.
Alternatively, to try to differentiate devices by function often tends to be a relatively boring catalogue of numerous unrelated devices. The main thing about them is signals are transformed from one form to another one. It is additionally possible to discuss sensors from the functional viewpoint, under headings such as length, temperature, etc., appropriate for somebody that actually desires to select or use a sensor for a particular application as opposed to just read around the subject.
The text ‘sensors’ and ‘transducers’ are both widely used within the description of measurement systems. The first kind is popular in the us whereas the second is much more often used in Europe. Deciding on a words in science is quite important. In recent years we have seen a propensity 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 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 topic.
The term ‘sensor’ is derived from sentire, meaning ‘to perceive’ and Compression Load Cell comes from transducere meaning ‘to lead across’. A dictionary definition Chambers 20th Century) of ‘sensor’ is ‘a device that detects a change in a physical stimulus and turns it in to a signal which is often measured or recorded’; a corresponding concept of ‘transducer’ is ‘a device that transfers power from one system to another in the same or in different form’.
An intelligent distinction is to apply ‘sensor’ for your sensing element itself, and ‘transducer’ for the sensing element plus any associated circuitry. For instance, thermistors are sensors, because they respond to a stimulus (changes its resistance with temperature), but only become transducers when connected in a bridge circuit to transform alternation in potential to deal with improvement in voltage, since the complete circuit then transduces from the thermal for the electrical domain. A solar cell is both a sensor along with a transducer, because it responds to a stimulus (generates a current or voltage responding to radiation) and also transducer from the radiant for the electrical domain. It will not require any associated circuitry, though in practice an amplifier would usually be utilized. All transducers thus contain a sensor, and many (though not every) sensors are also transducers.
The distinction is quite small and once one actually works with a sensor (by making use of capacity to it) it might be Triaxial Load Cell. An appealing classification of devices may be accomplished by taking into consideration the oygoqj forms 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 such as a light-emitting diode (LED) or moving coil meter. They are needless to say transducers utilized for output purposes, since they transduce from a single domain to a different (ie. electrical to radiant for LEDs).