MEASUREMENT METHOD AND TAG ARRANGED IN A SMOKING ARTICLE OR SMOKING ARTICLES PACKAGING

The invention relates to a measurement method for detection of features in a specimen (1) being a smoking article (1a) and/or a smoking articles packaging (1b), wherein the specimen (1) consists of at least a first material (2) and comprises a tag (3) consisting of at least one second (4) material having predetermined optical properties differing from those of the first material (2) in a frequency range between 0.3 and 10 THz, wherein the differing optical properties of the second material (4) comprise a coded information comprised in the tag. The method comprises the steps: a) generating electro-magnetic waves (5) comprising a frequency between 0.3 and 10 THz with a THz-wave-emitter (6), b) directing the electro-magnetic waves (5) being an incident signal (7) onto the specimen (1) and onto the tag (3), c) allowing the electro-magnetic waves (5) of the incident signal (7) to be modulated by the tag (3) due to different interaction with the second material (4) in comparison to the interaction with the first material (2) thereby creating a response signal (8) consisting of at least modulated electromagnetic waves (5a) comprising the coded information from the tag (3), d) detecting the response signal (8) comprising the modulated electro-magnetic waves (5a), which interacted with the tag (3), with a THz-wave-detector (9) and e) deriving the coded information from the detected modulated electro-magnetic waves (5a) of the response signal (8). The invention also relates to a tag.