Optical Microphone For Photoacoustic Spectroscopy

An optical microphone configuration is experimentally demonstrated. It is based on the deflection of a He-Ne laser beam from a thin reflective pellicle bound on one edge over the duct of a conventional photoacoustic cell. Possible applications of this kind of photoacoustic detection are discussed.6473722372

Photoacoustic Spectroscopy For Depth-profile Analysis And Herbicide Monitoring In Leaves

Depth profiles of double-layer biological samples obtained by photoacoustic spectroscopy were studied using the two-signal phase-resolved method. The application of the method was demonstrated by singling out the spectra of the cuticle and the pigment layers of a leaf, and the pericarps and the endosperm layers of a corn kernel. The use of the method for monitoring temporal changes occurring in a leaf under the action of a herbicide was also investigated.112111487149