“All-in-one” solid-state device based on a light-addressable potentiometric sensor platform

A miniaturised 16-channel LAPS device together with a control and measurement software was developed. The sensor chip, the IR-LED array and the electronic unit are accommodated in a small cylinder, which can be directly filled with the solution to be investigated. By modifying the measuring spots with various ion-selective membranes, this device can measure the concentrations of up to 16 different ions in parallel. The individual behaviour of each sensor spot is investigated separately by dynamically varying the analyte composition, by modifying the distance of the 16 LEDs to the sensor chip, and by means of IR long-time exposure pictures.