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 that are all-important.
Classification of sensors – In discussing Rotary Torque Sensor one must decide whether to classify them in accordance with the physical property they utilize (like piezoelectric, photovoltaic, etc.) or based on the function they perform (like measurement of length, temperature, etc.). In the former case anybody can present a reasonably integrated view of the sensing process, but it is just a little 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 attempt to differentiate devices by function often is usually a relatively boring catalogue of numerous unrelated devices. The important thing on them is signals are transformed from one form to another one. It is additionally easy to discuss sensors through the functional viewpoint, under headings such as length, temperature, etc., ideal for somebody who actually wants to select or use a sensor for a particular application rather than just read around the subject.
The phrase ‘sensors’ and ‘transducers’ are generally commonly used inside the description of measurement systems. The previous is popular in the united states whereas the latter is more often used in Europe. The option of words in science is rather important. In recent years we have seen a tendency to coin new words or misuse (or misspell) existing words, and this can lead to considerable ambiguity and misunderstanding, and has a tendency to diminish the preciseness of the language. The issue has been very apparent in the computer and microprocessor areas, where preciseness is particularly important, and can seriously confuse persons entering the subject.
The phrase ‘sensor’ comes from sentire, meaning ‘to perceive’ and Compression Load Cell is from transducere meaning ‘to lead across’. A dictionary definition Chambers Twentieth Century) of ‘sensor’ is ‘a device that detects a change 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 one system to another inside the same or perhaps in different form’.
An intelligent distinction is to use ‘sensor’ for that sensing element itself, and ‘transducer’ for that sensing element plus any associated circuitry. For instance, thermistors are sensors, because they reply to a stimulus (changes its resistance with temperature), but only become transducers when connected in a bridge circuit to convert alternation in resistance to alternation in voltage, considering that the complete circuit then transduces from your thermal for the electrical domain. A solar cell is both a sensor as well as a transducer, as it responds to your stimulus (produces a current or voltage responding to radiation) as well as transducer from the radiant for the electrical domain. It will not require any associated circuitry, though in reality an amplifier would usually be used. All transducers thus include a sensor, and lots of (though not all) sensors can also be transducers.
The distinction is pretty small and once one actually works with a sensor (by using capacity to it) it might be Multi Axis Load Cell. An appealing classification of devices can be accomplished by taking into consideration the oygoqj forms of energy or signal transfer.
The term ‘actuate’ means ‘to placed into, or incite to, action’ and actuators are devices that make the display or observable output in a measurement system such as a light-emitting diode (LED) or moving coil meter. They are of course transducers employed for output purposes, since they transduce from a single domain to a different (ie. electrical to radiant for LEDs).