When talking aerospace sensors, ‘analogue’ or ‘digital’ become hardly necessary, being simply a point of method of operation, and that it must be the underlying physical principles that are all-important.
Classification of sensors – In discussing Torque Transducer one must decide whether to classify them based on the physical property they utilize (such as piezoelectric, photovoltaic, etc.) or in accordance with the function they perform (including measurement of length, temperature, etc.). In the former case you can present a reasonably integrated take a look at the sensing process, however it is a little disconcerting when one desires to compare the merits of, say, two kinds of temperature sensors, if one has to examine separate sections on resistive, thermoelectric and semiconductor devices to make the comparison.
Alternatively, to attempt to differentiate devices by function often is commonly a rather boring catalogue of numerous unrelated devices. What is important on them is signals are transformed in one form to a different. It is additionally possible to discuss sensors from your functional viewpoint, under headings including length, temperature, etc., appropriate for somebody that actually wants to select or utilize a sensor for a particular 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 a lot more often used in Europe. The option of words in science is quite important. In recent years we have seen a tendency to coin new words or to misuse (or misspell) existing words, and this might lead to considerable ambiguity and misunderstanding, and is likely to diminish the preciseness in the language. The issue continues to be very apparent inside 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 Miniature Load Cell comes 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 into a signal which can be measured or recorded’; a corresponding concept of ‘transducer’ is ‘a device that transfers power from a single system to another one within the same or perhaps in different form’.
A smart distinction is to apply ‘sensor’ for your sensing element itself, and ‘transducer’ for that sensing element plus any associated circuitry. For example, 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 change in effectiveness against improvement in voltage, since the complete circuit then transduces from the thermal to the electrical domain. A solar cell is both a sensor as well as a transducer, as it responds to some stimulus (creates a current or voltage in response to radiation) as well as transducer from the radiant towards the electrical domain. It can not require any associated circuitry, though in practice an amplifier would usually be utilized. All transducers thus have a sensor, and many (though not all) sensors are also transducers.
The distinction is pretty small, and once one actually utilizes a sensor (by applying capability to it) it will become Triaxial Load Cell. An interesting classification of devices may be accomplished by thinking about the oygoqj forms of energy or signal transfer.
The word ‘actuate’ means ‘to put into, 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 of course transducers employed for output purposes, given that they transduce from one domain to a different (ie. electrical to radiant for LEDs).