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Photoacoustic spectrometry PAS

Photoacoustic spectrometry (pas) differs from the other methods in that the detector is a microphone. This makes pas wavelength independent. [Pg.199]

In this article, the key principles of photoacoustic spectrometry (PAS) will be described together with a simple discussion of the instrumentation required to perform PAS. Some important applications will be discussed and future scope of the technique s application outlined. The introduction brings together some historical generalities of the technique followed by sections on its theoretical aspects, instrumentation, and analytical applications. The emphasis is on chemical analysis throughout. [Pg.3718]

Photoacoustic spectrometry (PAS) was first developed for applications in the ultraviolet-visible region its practical use for measurements in the mid-infrared region became popular with Fourier transform (FT) spectrometers in the 1980s. [Pg.199]

In Chapter 20 we saw how photoacoustic (PA) spectra could be measured with a step-scan interferometer no matter whether the PA signal was demodulated with a lock-in amplifier or by digital signal processing (DSP). For DSP, a Fourier transform (FT) has the same function as the lock-in amplifier. Manning et al. [14] showed that the same approach is feasible in DIRLD spectrometry with a step-scan FT-IR spectrometer but without a PEM. Consider the case where the detector signal contains components caused by simultaneous sinusoidal phase modulation at frequency /pm, and sample modulation at frequency fs. The phase- and sample-modulated components of the signal can be demodulated either with a... [Pg.454]


See other pages where Photoacoustic spectrometry PAS is mentioned: [Pg.106]    [Pg.1100]    [Pg.53]    [Pg.106]    [Pg.1100]    [Pg.53]    [Pg.3718]    [Pg.750]    [Pg.416]    [Pg.423]    [Pg.32]    [Pg.534]    [Pg.241]    [Pg.415]    [Pg.422]    [Pg.1144]   
See also in sourсe #XX -- [ Pg.199 , Pg.200 , Pg.201 , Pg.202 , Pg.203 , Pg.204 , Pg.205 , Pg.206 , Pg.207 ]




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