TERAHERTZ WAVE REFLECTION IMAGING SYSTEM BASED ON BACKWARD WAVE OSC ILLATOR AND ITS APPL ICATION
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1 J. Infrared M illim. W aves Vol. 29, No. 1 February, 2010 : (2010) ,,, (, ) :..,. 0. 7THz,.,,. : ; ; ; : O439 : A TERAHERTZ WAVE REFLECTION IMAGING SYSTEM BASED ON BACKWARD WAVE OSC ILLATOR AND ITS APPL ICATION GE Xin2Hao, LV Mo, ZHONG Hua, ZHANG Cun2L in (Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Key Laboratory of Terahertz Op toelectronics, M inistry of Education, Department of Physics, Cap ital Normal University, Beijing , China) Abstract: A terahertz ( THz) wave reflection imaging system based on backward wave oscillator (BWO) was p resented. It is a new app roach to non2destructive testing. The intensity information of the terahertz wave after being reflected from the samp le surface or substrate was collected by a pyroelectric detector, and then imaged by computer. A number of samp les which had potential imaging app lications were tested by using 0. 7 THz radiation, including coins, badges, a model air2 p lane and some industrial samp les that contained p re2built defects. The experimental results reveal that THz radiation is highly transparent to many industrial materials, especially the m icrowave2absorbing material which is widely used in aero and space technologies. Key words: nondestructive testing; terahertz imaging; backward2wave oscillator(bwo) ; reflection imaging ( THz, 1THz = Hz) THz.,, [ 1 ],. (, BWO, Backward W ave O scillator),, 0. 1THz [ 1 ].,. (BWO ),,,..,, [ 2 ]. : , : Rece ived da te: , rev ised da te: : 973 (2007CB310408) ; ( ) : (19832),,,,, E2mail: loringe@126. com.
2 16 29 [ 3 ],,., [ 4] BWO.,,,,.,.,., GHz, [ 5], :,,.,,.,.,, :,,,, ;,,.,,,,.,., 1 BWO Fig. 1 Schematic layout of the reflective BWO THz imaging setup, [ 1 ].,,,. 2 BWO [ 6 ] 1, GHz, 0. 2mW. [ 7 ] ( Pyroelectric Detector)., 700GHz., 10Hz,, 20cm 30cm.,.,,,.,. 2, ( a) ( b) ( c), (d).,,., TDS,., 10cm 10cm, 1mm, 30m in. [ 8 ],.,., 700GHz.
3 1 : mm, 700GHz 0. 19mm., [ 9 ], [ 10 ]. [ 4 ],, 4. 3mm , 6mm, 0. 5mm, 1mm,, 1mm.,. 3 ( a), ( b), 140mm 85mm , 5, 6.,, ; ( 5) ( 4 ),.,.,,. 7,., 7 ( a) 12 ( b),.,.
4 29,,, m,,.,. 9, 9 ( b),,..,, ,.,.,,.,.,.,,,,. 4 (BWO ),, ( Pyroelectric Detector), 1 mm..,,,,,. (973 ) (No. 2007CB310408) ( 31 )
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