Sensitive Photo-acoustic Detection Based On Resonance Enhancement And Resonance-frequency Modulation
Original Publication Date: 1985-Mar-01
Included in the Prior Art Database: 2005-Feb-19
A sensitive photo-acoustic (PA) detection method is based on resonance enhancement and resonance-frequency modulation. This detection method involves a double modulation PA technique in which a parameter affecting the acoustic resonance of the PA cell is modulated and the light intensity of the tunable light source being modulated at a second frequency.