tuning fork
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Who knows the principle behind using a tuning fork to detect whether a fluid has passed through
In this case, the tuning fork must be installed at a high point in the pipe, so that the medium does not remain trapped in that section of the pipe after it passes through. In short, the pipe needs to be emptied after the material has been delivered.
A tuning fork consists of two parts: the tuning fork itself and the electronic circuitry. At the bottom of the tuning fork there are two sets of piezoelectric crystals; one set serves as the driving element, while the other acts as the sensing element. The driving element is used to make the tuning fork vibrate, and the sensing element is used to convert these vibrations into voltage. When no medium is in contact with the tuning fork, it vibrates; once a medium comes into contact with it, the tuning fork stops vibrating, which results in a change in the voltage output. Does that make sense?