[15a-211-1~13] 3.9 Terahertz technologies

[15a-211-9] Non-Contact Inspection of Bills by Terahertz Spectroscopic Imaging

〇Tadao Tanabe¹, Takashi Kimura¹, Kensaku Maeda², Kouichi Goi³, Yutaka Oyama¹ (1.Tohoku Univ., 2.Tohoku Univ. IMR, 3.Laurel Bank Machines)

Keywords:terahertz, non-contact Inspection, bill

Terahertz wave has high permeability for non-polar materials, which is expected to be used as non-contact inspection of bills. In this study we have demonstrated terahertz spectroscopic imaging for detection of ultrathin tapes pasted on bill by using our frequency-tunable narrow-band terahertz wave generated from GaP based on difference frequency generation of near infrared lights.