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 that are all-important.
Classification of sensors – In discussing Torque Transducer one has to decide if you should classify them according to the physical property they normally use (such as piezoelectric, photovoltaic, etc.) or according to 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, yet it is a bit disconcerting when one wishes to compare the merits of, say, two types of temperature sensors, if one has to look over separate sections on resistive, thermoelectric and semiconductor devices to create the comparison.
Alternatively, to attempt to differentiate devices by function often is commonly a rather boring catalogue of numerous unrelated devices. The important thing on them is signals are transformed in one form to another one. It is additionally easy to discuss sensors from your functional viewpoint, under headings like length, temperature, etc., ideal for somebody who actually would like to select or utilize a sensor for a particular application as opposed to just read round the subject.
The phrase ‘sensors’ and ‘transducers’ both are commonly used within the description of measurement systems. The previous is popular in the USA whereas the latter is a lot more often utilized in Europe. The choice of words in science is rather important. Lately we have seen a tendency to coin new words or even to misuse (or misspell) existing words, and this might lead to considerable ambiguity and misunderstanding, and tends to diminish the preciseness in the language. The issue has been very apparent inside the computer and microprocessor areas, where preciseness is particularly important, and will seriously confuse persons entering the subject.
The term ‘sensor’ is derived from sentire, meaning ‘to perceive’ and Micro 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 right into a signal which is often measured or recorded’; a corresponding meaning of ‘transducer’ is ‘a device that transfers power from one system to a different inside 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 react to a stimulus (changes its resistance with temperature), only become transducers when connected in a bridge circuit to transform change in effectiveness against change in voltage, since the complete circuit then transduces from the thermal towards the electrical domain. A solar cell is both a sensor as well as a transducer, because it responds to a stimulus (generates a current or voltage responding to radiation) and also transducer from your radiant to the electrical domain. It can not require any associated circuitry, though in reality an amplifier would usually be applied. All transducers thus contain a sensor, and many (though not all) sensors are also transducers.
The difference is pretty small and once one actually works with a sensor (by applying capability to it) it becomes Multi Axis Load Cell. An interesting classification of devices may be accomplished by taking into consideration the oygoqj kinds of energy or signal transfer.
The phrase ‘actuate’ means ‘to placed into, 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 obviously transducers utilized for output purposes, since they transduce in one domain to another one (ie. electrical to radiant for LEDs).