162
A. Saha
5.3 Food Industry
Food industry all over the world is suffering from potential hazards of contaminations. THz systems can detect both non-metallic and metallic contaminations [107].
Even the presence of different non-metallic and metallic inclusions within low water
content foodstuff like chocolate bars can also be detected using THz imaging [108].
In the fresh food industry with packaging protection, the study of moisture quantification can also be an interesting application. Cardboard and plastic are transparent
in the THz waveband. Utilizing this property, foreign object inside packaging is
detected. Detection of potentially harmful contaminants such as pieces of wood,
plastic, stone, glass or metal in food is one of the most important problems for the
food industry. Terahertz technology can detect the presence of metallic as well as
non-metallic materials in food items.
5.4 Art Conservation
To preserve cultural heritage artworks efficiently, it is required to have knowledge
of materials science. Challenges are faced by THz technology in developing nondestructive analytical methods and to integrate it with new diagnostic techniques.
However, THz investigations of mural paintings are performed [109]. Using THzTDS technique, it is detected by Abraham et al. that a graphite drawing was present
[110] under paint and plaster layers. Images of THz reflection from hidden paint
layers [111] have been compared. Recently, THz imaging is used for the study of
mummies also [112].
5.5 Pharmaceutical Industry
Recently, it is seen that the THz imaging has applications in the pharmaceutical
industry [57, 59]. A lot of chemicals show characteristic spectral fingerprints in the
terahertz waveband. This property may be used to identify and detect unwanted
contamination at the time of production of drugs in the pharmaceutical industry
[113]. THz is also suitable for quality control of tablet coatings [114].
5.6 Polymer and Paper Industries
Current trends in the areas of quality control and technical diagnostic applications
demand non-destructive THz imaging. Its core uses are seen in the polymer and paper
industries. THz systems can be utilized in polymer and paper industries to control
A. Saha
5.3 Food Industry
Food industry all over the world is suffering from potential hazards of contaminations. THz systems can detect both non-metallic and metallic contaminations [107].
Even the presence of different non-metallic and metallic inclusions within low water
content foodstuff like chocolate bars can also be detected using THz imaging [108].
In the fresh food industry with packaging protection, the study of moisture quantification can also be an interesting application. Cardboard and plastic are transparent
in the THz waveband. Utilizing this property, foreign object inside packaging is
detected. Detection of potentially harmful contaminants such as pieces of wood,
plastic, stone, glass or metal in food is one of the most important problems for the
food industry. Terahertz technology can detect the presence of metallic as well as
non-metallic materials in food items.
5.4 Art Conservation
To preserve cultural heritage artworks efficiently, it is required to have knowledge
of materials science. Challenges are faced by THz technology in developing nondestructive analytical methods and to integrate it with new diagnostic techniques.
However, THz investigations of mural paintings are performed [109]. Using THzTDS technique, it is detected by Abraham et al. that a graphite drawing was present
[110] under paint and plaster layers. Images of THz reflection from hidden paint
layers [111] have been compared. Recently, THz imaging is used for the study of
mummies also [112].
5.5 Pharmaceutical Industry
Recently, it is seen that the THz imaging has applications in the pharmaceutical
industry [57, 59]. A lot of chemicals show characteristic spectral fingerprints in the
terahertz waveband. This property may be used to identify and detect unwanted
contamination at the time of production of drugs in the pharmaceutical industry
[113]. THz is also suitable for quality control of tablet coatings [114].
5.6 Polymer and Paper Industries
Current trends in the areas of quality control and technical diagnostic applications
demand non-destructive THz imaging. Its core uses are seen in the polymer and paper
industries. THz systems can be utilized in polymer and paper industries to control