When talking aerospace sensors, ‘analogue’ or ‘digital’ become hardly necessary, being simply a point of method of operation, and that it must be the actual physical principles which are all-important.
Classification of sensors – In discussing Rotary Torque Sensor one must decide whether or not to classify them in accordance with the physical property they utilize (like piezoelectric, photovoltaic, etc.) or in accordance with the function they perform (including measurement of length, temperature, etc.). Within the former case you can present a reasonably integrated take a look at the sensing process, yet it is just a little disconcerting when one would like to compare the merits of, say, 2 kinds of temperature sensors, if one has to examine separate sections on resistive, thermoelectric and semiconductor devices to create the comparison.
Alternatively, to try to differentiate devices by function often is commonly a relatively boring catalogue of numerous unrelated devices. The main thing on them is signals are transformed from a single form to another one. Additionally it is easy to discuss sensors from your functional viewpoint, under headings including length, temperature, etc., ideal for someone who actually desires to select or make use of a sensor for the application as opposed to just read round the subject.
The text ‘sensors’ and ‘transducers’ are generally commonly used inside the description of measurement systems. The first kind is popular in the USA whereas the second is a lot more often found in Europe. The option of words in science is pretty important. Recently there has been an inclination to coin new words or even to misuse (or misspell) existing words, and this may lead to considerable ambiguity and misunderstanding, and is likely to diminish the preciseness of the language. The matter continues to be very apparent within the computer and microprocessor areas, where preciseness is extremely important, and can seriously confuse persons entering the topic.
The term ‘sensor’ comes 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 big change in a physical stimulus and turns it 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 another one inside the same or even in different form’.
An intelligent distinction is by using ‘sensor’ for your sensing element itself, and ‘transducer’ for your sensing element plus any associated circuitry. For example, thermistors are sensors, given that they respond to a stimulus (changes its resistance with temperature), but only become transducers when connected in a bridge circuit to transform improvement in effectiveness against alternation in voltage, considering that the complete circuit then transduces from the thermal to the electrical domain. A solar cell is both a sensor and a transducer, since it responds to some stimulus (generates a current or voltage in reaction to radiation) and also transducer from the radiant to 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 difference is rather small, and as soon as one actually works with a sensor (by using capacity to it) it might be 3 Axis Load Cell. An appealing classification of devices can be accomplished by thinking about the oygoqj kinds of energy or signal transfer.
The word ‘actuate’ means ‘to placed into, or incite to, action’ and actuators are devices that make the display or observable output in a measurement system like a light-emitting diode (LED) or moving coil meter. These are needless to say transducers used for output purposes, given that they transduce in one domain to another (ie. electrical to radiant for LEDs).