Microcantilever Gas Analyzer for Detecting Resonances

Technical Summary:

This detector identifies and analyzes electrical signal in semi-conductive or conductive elements at resonance frequencies. The detection and analysis of an electric signal is performed based on movement between an element and a counter electrode influenced by a non-linear electric field produced by an electrical signal impressed between the element and counter electrode. Changes in the distance and environmental parameters between the element and the counter electrode may be monitored based on the changes in the value of the capacitance between the element and counter electrode. The method includes applying a signal to a counter electrode and thereby inducing an electrostatic force on a cantilever that is in a non-contact arrangement with electrode. This electrostatic force generates electric signal at the element. At resonance, this generated signal will contain not only the fundamental mode of the applied signal, but will also contain harmonics of the generated signal. By observing the changes in the generated signal, chemical/biological species can be detected as well as monitor parameters that influence resonance.