THz Spectroscopic Imaging of Chemicals Using IS-TPG

2016 ◽  
Vol 25 (03n04) ◽  
pp. 1640016
Author(s):  
Kosuke Murate ◽  
Mikiya Kato ◽  
Kodo Kawase
Keyword(s):  
Illicit Drugs ◽  
Tuning Range ◽  
Dynamic Range ◽  
Spectroscopic Imaging ◽  
Thz Wave ◽  
Non Destructive ◽  
Parametric Source ◽  
Wave Spectrometer

In 2003, we demonstrated a non-destructive terahertz spectroscopic imaging of illicit drugs hidden in envelopes using a widely tunable THz-wave parametric source, though its dynamic range at that time was less than four orders. Recently, we have realized more than nine orders of dynamic range with an evolved injection seeded THz-wave spectrometer. Now we can detect drugs under much thicker obstacles than before. In this report, we introduce the result of THz spectroscopic imaging of chemicals under thick envelopes and related topics; Enhanced tuning range of is-TPG up to 5 THz and >90 dB dynamic range THz spectroscopic system.

Non-destructive Inspection Method for Defects in Epoxy Resin by using THz Wave

2020 ◽  
Author(s):  
Rieko Mizuuchi ◽  
Yuji Hisazato ◽  
Hiroaki Cho ◽  
Yusuke Nakamura ◽  
Yuichi Sumimoto ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Inspection Method ◽  
Thz Wave ◽  
Non Destructive

scholarly journals Integrating Resonator to Enhance Magnetometer Microelectromechanical System Implementation with ASIC Compatible CMOS 0.18 μm Process

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 635
Author(s):  
Chih-Hsuan Lin ◽  
Chao-Hung Song ◽  
Kuei-Ann Wen
Keyword(s):  
Resonant Frequency ◽  
Tuning Range ◽  
Dynamic Range ◽  
Ambient Pressure ◽  
Readout Circuit ◽  
Microelectromechanical System ◽  
Correlated Double Sampling ◽  
Driving Current ◽  
Mems Oscillator ◽  
Oscillation Characteristics

In this study, a multi-function microelectromechanical system (MEMS) was integrated with a MEMS oscillator, using the resonant frequency oscillation characteristics of the oscillator to provide the Lorentz current of the magnetometer to enhance a large dynamic range of reading, which eliminates the off-chip clock and current generator. The resonant frequency can be adjusted by adjusting the bias voltage of the oscillator to further adjust the sensitivity of the magnetometer. With the mechanical Q value characteristic, a great dynamic range can be achieved. In addition, using the readout circuit of the nested chopper and correlated double-sampling (CDS) to reduce the noise and achieve a smaller resolution, the calibration circuit compensates for errors caused by the manufacturing process. The frequency of the tuning range of the proposed structure is 17,720–19,924 Hz, and the tuning range of the measurement result is 110,620.36 ppm. The sensitivities of the x-, y-, and z-axes of the magnetometer with driving current of 2 mA are 218.3, 74.33, and 7.5 μV/μT for ambient pressure of 760 torr. The resolutions of the x-, y-, and z-axes of the magnetometer with driving current of 2 mA are 3.302, 9.69, and 96 nT/√Hz for ambient pressure of 760 torr.

scholarly journals Non-Destructive Inspection of Illicit Drugs Concealed in Mail Envelopes

2016 ◽  
Vol 82 (3) ◽  
pp. 217-220
Author(s):  
Ryo YAMAZAKI ◽  
Mikiya KATO ◽  
Kosuke MURATE ◽  
Kazuki IMAYAMA ◽  
Kodo KAWASE
Keyword(s):  
Illicit Drugs ◽  
Non Destructive

scholarly journals Non-destructive terahertz imaging of illicit drugs using spectral fingerprints

2003 ◽  
Vol 11 (20) ◽  
pp. 2549 ◽  
Author(s):  
Kodo Kawase ◽  
Yuichi Ogawa ◽  
Yuuki Watanabe ◽  
Hiroyuki Inoue
Keyword(s):  
Illicit Drugs ◽  
Terahertz Imaging ◽  
Non Destructive
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