When talking aerospace sensors, ‘analogue’ or ‘digital’ become hardly necessary, being simply a matter of method of operation, and that it must be the underlying physical principles which are all-important.
Classification of sensors – In discussing Torque Transducer one must decide if you should classify them based on the physical property they utilize (like piezoelectric, photovoltaic, etc.) or in accordance with the function they perform (like measurement of length, temperature, etc.). Inside the former case anybody can present a reasonably integrated look at the sensing process, however it is a bit disconcerting when one wishes 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 tends to be a relatively boring catalogue of numerous unrelated devices. The important thing about the subject is signals are transformed from a single form to another one. It is additionally possible to discuss sensors through the functional viewpoint, under headings including length, temperature, etc., suitable for someone who actually would like to select or utilize a sensor for a particular application as opposed to just read round the subject.
The text ‘sensors’ and ‘transducers’ are generally widely used within the description of measurement systems. The previous is popular in the us whereas the latter is more often found in Europe. The option of words in science is rather important. Recently we have seen a tendency to coin new words or misuse (or misspell) existing words, and this might lead to considerable ambiguity and misunderstanding, and tends to diminish the preciseness in the language. The challenge has been very apparent inside the computer and microprocessor areas, where preciseness is particularly important, and can seriously confuse persons entering the topic.
The word ‘sensor’ is derived from sentire, meaning ‘to perceive’ and Miniature Load Cell is from transducere meaning ‘to lead across’. A dictionary definition Chambers 20th Century) of ‘sensor’ is ‘a device that detects a change in a physical stimulus and turns it in to a signal which may be measured or recorded’; a corresponding concept of ‘transducer’ is ‘a device that transfers power in one system to another one within the same or in different form’.
A smart distinction is by using ‘sensor’ for your sensing element itself, and ‘transducer’ for your sensing element plus any associated circuitry. As an 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 change in resistance to change in voltage, considering that the complete circuit then transduces from the thermal towards the electrical domain. A solar cell is both a sensor along with a transducer, since it responds to some stimulus (produces a current or voltage in reaction to radiation) and in addition transducer from the radiant towards the electrical domain. It does not require any associated circuitry, though in reality an amplifier would usually be applied. All transducers thus have a sensor, and several (though its not all) sensors are also transducers.
The difference is quite small, and once one actually works with a sensor (by making use of capability to it) it might be Triaxial Load Cell. An appealing classification of devices may be accomplished by thinking about the oygoqj forms of energy or signal transfer.
The term ‘actuate’ means ‘to put in, or incite to, action’ and actuators are devices that produce the display or observable output in a measurement system for instance a light-emitting diode (LED) or moving coil meter. They may be obviously transducers utilized for output purposes, given that they transduce from one domain to another (ie. electrical to radiant for LEDs).