Acoustic resonance frequency locked photoacoustic spectrometer
AssigneeSouthwest Sciences Incorporated
InventorsJeffrey S. Pilgrim, David S. Bomse, Joel A. Silver
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Abstract
A photoacoustic spectroscopy method and apparatus for maintaining an acoustic source frequency on a sample cell resonance frequency comprising: providing an acoustic source to the sample cell, the acoustic source having a source frequency; repeatedly and continuously sweeping the source frequency across the resonance frequency at a sweep rate; and employing an odd-harmonic of the source frequency sweep rate to maintain the source frequency sweep centered on the resonance frequency.
Claims25
A photoacoustic spectroscopy method for maintaining an acoustic source frequency on a sample cell resonance frequency, the method comprising the steps of:
- providing an acoustic source to the sample cell, the acoustic source having a source frequency;
- repeatedly and continuously sweeping the source frequency across the resonance frequency at a sweep rate;
- and
- employing an odd-harmonic of the source frequency sweep rate to maintain the source frequency sweep centered on the resonance frequency.
A photoacoustic spectroscopy apparatus for maintaining an acoustic source frequency on a sample cell resonance frequency, said apparatus comprising:
- means for providing an acoustic source to the sample cell, said acoustic source having a source frequency;
- means for repeatedly and continuously sweeping the acoustic source frequency across the resonance frequency at a sweep rate;
- and
- means for employing an odd-harmonic of the acoustic source frequency sweep rate to maintain the acoustic source frequency sweep centered on the resonance frequency.
An acoustic resonance frequency locked photoacoustic spectrometer comprising:
- an acoustic source repeatedly and continuously sweeping an acoustic source frequency across a resonance frequency of a sample cell at a sweep rate;
- and
- a lock-in amplifier employing an odd-harmonic of the acoustic source frequency sweep rate to maintain the acoustic source frequency sweep centered on the resonance frequency.
Dependencies are inferred from the claim text.