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 has to decide whether or not to classify them based on the physical property they utilize (including piezoelectric, photovoltaic, etc.) or based on the function they perform (like measurement of length, temperature, etc.). Within the former case you can present a reasonably integrated view of the sensing process, yet it is a bit disconcerting when one would like to compare the merits of, say, 2 kinds of temperature sensors, if one must look over separate sections on resistive, thermoelectric and semiconductor devices to create the comparison.
Alternatively, to try and differentiate devices by function often is commonly a rather boring catalogue of numerous unrelated devices. The main thing about the subject is signals are transformed in one form to another. It is also easy to discuss sensors from your functional viewpoint, under headings including length, temperature, etc., ideal for somebody who actually would like to select or make use of a sensor for the application rather than just read round the subject.
The phrase ‘sensors’ and ‘transducers’ are generally widely used within the description of measurement systems. The first kind is popular in the united states whereas the latter is much more often utilized in Europe. Deciding on a words in science is quite important. Lately there has been an inclination to coin new words or misuse (or misspell) existing words, and this may lead to considerable ambiguity and misunderstanding, and tends to diminish the preciseness from the language. The challenge continues to be very apparent within the computer and microprocessor areas, where preciseness is extremely important, and will seriously confuse persons entering the topic.
The word ‘sensor’ comes from sentire, meaning ‘to perceive’ and Compression Load Cell is 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 may be measured or recorded’; a corresponding definition of ‘transducer’ is ‘a device that transfers power from a single system to a different inside the same or even in different form’.
An intelligent distinction is to apply ‘sensor’ for your sensing element itself, and ‘transducer’ for the 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 convert improvement in resistance to alternation in voltage, because the complete circuit then transduces from the thermal for the electrical domain. A solar cell is both a sensor and a transducer, since it responds to your stimulus (generates a current or voltage in reaction to radiation) as well as transducer through the radiant to the electrical domain. It can not require any associated circuitry, though in practice an amplifier would usually be utilized. All transducers thus contain a sensor, and many (though not all) sensors are also transducers.
The distinction is rather small, and the moment one actually utilizes a sensor (by making use of capability to it) it will become 3 Axis Load Cell. A fascinating classification of devices can be accomplished by taking into consideration the oygoqj kinds 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 like a light-emitting diode (LED) or moving coil meter. They are of course transducers utilized for output purposes, because they transduce in one domain to another one (ie. electrical to radiant for LEDs).