| 摘要 |
A photoacoustic detector is presented having the following structure: a first and a second light source (1a, b) for providing light of the same intensity while retaining the same spectral distribution; a first beam path allocated to the first light source (1a) and at least one second beam path allocated to the at least one second light source (1b), wherein a different absorption of light can occur in the first and second beam paths in selected wavelength ranges; means (4) for alternately guiding light from the first and from the at least one second beam path into a photoacoustic measuring cell (6), the intensity of the light sources being constant in such a way that the temporal change thereof cannot generate a photoacoustic signal that distorts the measurement.
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