| 摘要 |
An apparatus (1) for detecting a substance in a rod shaped article of the tobacco industry (2), the apparatus (1) including one or more sources (10,11) of electromagnetic radiation, one or more detectors (26, 27) and a processor (32). The one or more sources (10, 11) are configured to generate electromagnetic radiation at first and second wavelengths (λl, λ2). The one or more detectors (26, 27) are configured to detect the first and second wavelengths (λ1, λ2) after propagation in the rod shaped article (2), lo and to generate signals (A, B) based on the amount of radiation received at each wavelength (λ1, λ2). The processor (32) is configured to process the signals (A, B) to determine information relating to the presence of the substance, based on the relative amount of radiation received at the first and second wavelengths. |
