| abstract |
A method of determining a gap height in a droplet actuator including measuring an impedance between a droplet operations electrode of a first substrate in a droplet actuator and ground electrode of a second substrate in the droplet actuator, storing a lookup table that associates impedances to heights of gaps between the first substrate and the second substrate, querying the lookup table for the impedance measured between the droplet operations electrode of the first substrate and the ground electrode of the second substrate; and retrieving a height of a gap associated with the impedance. |