When talking torque transducer, ‘analogue’ or ‘digital’ become barely essential, being simply a case of approach to operation, and that it is the underlying physical principles that are all-important.
Classification of sensors
In discussing sensing devices one has to decide whether to classify them based on 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.). Within the former case you can present a reasonably integrated take a look at the sensing process, yet it is a bit disconcerting when one desires to compare the merits of, say, 2 kinds of temperature sensors, if one has to look through separate sections on resistive, thermoelectric and semiconductor devices to help make the comparison.
Alternatively, to try and differentiate devices by function often is usually a rather boring catalogue of numerous unrelated devices. What is important about the subject is signals are transformed from one form to a different. Additionally it is easy to discuss button load cell from your functional viewpoint, under headings such as length, temperature, etc., appropriate for somebody that actually wants to select or utilize a sensor for the application as opposed to just read round the subject.
The phrase ‘sensors’ and ‘transducers’ both are popular in the description of measurement systems. The former is popular in the united states whereas the latter is a lot more often found in Europe. Deciding on a words in science is rather important. In recent years we have seen 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 in the computer and microprocessor areas, where preciseness is particularly important, and can seriously confuse persons entering the subject.
The word ‘sensor’ hails from sentire, meaning ‘to perceive’ and ‘transducer’ 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 in to a signal which may 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’.
An intelligent distinction is by using ‘sensor’ for that sensing element itself, and ‘transducer’ for your sensing element plus any associated circuitry. For example, thermistors are sensors, because they reply to a stimulus (changes its resistance with temperature), only become transducers when connected in a bridge circuit to convert alternation in potential to deal with alternation in voltage, since the complete circuit then transduces from the thermal to the electrical domain. A solar cell is both a sensor and a transducer, because it responds to a stimulus (creates a current or voltage responding to radiation) and also transducer through the radiant for the electrical domain. It can not require any associated circuitry, though in reality an amplifier would usually be utilized. All transducers thus hkjrzk a sensor, and many (though not every) sensors will also be transducers.
The difference is pretty small, and as soon as one actually utilizes a sensor (by applying capability to it) it will become weight sensor. An appealing classification of devices may be accomplished by thinking about the various forms 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 may be obviously transducers employed for output purposes, because they transduce from a single domain to a different (ie. electrical to radiant for LEDs).