Knowledge Center

Here, we examine the principles of how biological piezoelectric sensors and impedance analyzers can be used to detect changes in resonant frequency, including some practical applications and key aspects of using the technique.

Impedance analyzers have been used on a commercial basis and increasingly for biological applications since the 1980s. The techniques are relatively easy to learn and use, while equipment has also become increasingly portable and cost-effective due to technological advances over recent decades… read more

In an electrical circuit, a potential difference between two points induces the flow of current. Impedance is defined as the sum of resistance and, in the case of alternating current supplies, reactance; the effect is to reduce current flow.

If the circuit comprises only resistors, then the impedance is constant at all frequencies and has what is known as ohms law, defined by: … read more