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Abstract
Amplitude and phase-modulation (AM-PM) wide-band photothermal spectrometry is experimentally demonstrated, using apparatus constructed from readily available components. Theoretical AM-PM wide-band waveforms were digitally synthesized, filtered, and used as excitation waveforms in a wide-band spectrometer using photopyroelectric effect detection. The frequency domain dynamic range of the AM-PM wide-band technique was clearly superior to linear FM photothermal spectrometry. Multiband spectrometry was also demonstrated, in which several arbitrary narrow-band regions or ‘‘slices’’ of the frequency response were recovered simultaneously. The procedure shows great promise for image enhancement in thermal-wave applications, where selective target features of interest may be studied in the absence of neighboring interference.
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