OSCILLATOR ELEMENT FOR PHOTO ACOUSTIC DETECTOR

摘要

An oscillator element (10) for use in a photo acoustic detector is provided for detecting a concentration of a sample in a sample mixture. The photo acoustic detector uses a light beam (11) for excitation of molecules of the sample (15) in proximity of an excitation area (25) of the oscillator element (10). The excitation results in resonance of the oscillator element (10). The oscillator element (10) comprises piezoelectric material (20) for generating a voltage when mechanically distorted and electrodes (21-24), at least partially covering a surface of the oscillator element (10) for registering the generated voltage. The excitation area (25) is arranged in such a way that heating of the electrodes (21-24) in the excitation area (25) by the light beam (11) is avoided.