| 摘要 |
<p>A photothermal measurement cell for study of light absorption by a sample substance. The sample substance is placed in contact with a temperature expansion element (6) of a solid material, for example quartz, glass, sapphire or the equivalent. The said element is arranged in contact with a mechanoelectric or mechanooptical transducer (7), for example a piezoelectric crystal. As the light is absorbed by the sample substance its temperature is raised, whereupon the temperature expansion element (6) expands and its mechanical motion is transformed to an electric signal by the transducer (7), whereupon the signal is amplified and registered for example by an X-Y recorder (10).</p> |
