When talking aerospace sensors, ‘analogue’ or ‘digital’ become hardly necessary, being simply a matter of method of operation, and that it is the actual physical principles that are all-important.
Classification of sensors – In discussing Torque Transducer one must decide whether or not to classify them according to the physical property they use (like piezoelectric, photovoltaic, etc.) or according to the function they perform (like measurement of length, temperature, etc.). Inside the former case one can present a reasonably integrated view of the sensing process, however it is just a little disconcerting when one wishes 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 make the comparison.
Alternatively, to try to differentiate devices by function often tends to be an extremely boring catalogue of numerous unrelated devices. The important thing about the subject 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 would like to select or use a sensor for a particular application as opposed to just read round the subject.
The phrase ‘sensors’ and ‘transducers’ are both popular within the description of measurement systems. The former is popular in the USA whereas the latter is more often utilized in Europe. Deciding on a words in science is quite important. Recently there has been 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 of the language. The matter 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’ comes from sentire, meaning ‘to perceive’ and Miniature 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 right into a signal which can be measured or recorded’; a corresponding definition of ‘transducer’ is ‘a device that transfers power from a single system to another within the same or in different form’.
A smart distinction is to apply ‘sensor’ for the sensing element itself, and ‘transducer’ for that sensing element plus any associated circuitry. For instance, thermistors are sensors, because they respond to a stimulus (changes its resistance with temperature), only become transducers when connected in a bridge circuit to transform improvement in potential to deal with change in voltage, considering that the complete circuit then transduces through the thermal to the electrical domain. A solar cell is both a sensor along with a transducer, as it responds to a stimulus (generates a current or voltage in reaction to radiation) as well as transducer from your radiant towards 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 several (though its not all) sensors will also be transducers.
The difference is quite small and once one actually utilizes a sensor (by using capability to it) it will become Triaxial Load Cell. A fascinating classification of devices may be accomplished by taking into consideration the oygoqj forms of energy or signal transfer.
The term ‘actuate’ means ‘to put into, or incite to, action’ and actuators are devices that make the display or observable output in a measurement system for instance a light-emitting diode (LED) or moving coil meter. These are needless to say transducers employed for output purposes, given that they transduce from one domain to another (ie. electrical to radiant for LEDs).