Table 1. Various Transfer Functions (TF).
| transfer function | input signal | output signal |
|---|---|---|
| impedancea | voltage (V) or current (I) | current (I) or voltage (V) |
| IMPS24 | light intensity (φ) | photocurrent (I) |
| IMVS24 | light intensity (φ) | photovoltage (V) |
| electrohydrodynamic impedance25 | rotation speed (Ω) | current (I) or voltage (V) |
| thermoelectrochemical TF26,27 | electrode temperature (T) | current (I) |
| pneumatochemical impedance spectroscopy28 | pressure (P) | voltage (V) |
a
When the input signal is voltage (V), measurements correspond to admittance (see below), the inverse of impedance.