Terahertz-Wave Imaging System Based on Backward Wave Oscillator


An imaging system primarily based on the transmission and reflection modes in the terahertz (THz) region is developed by using a backward-wave oscillator (BWO) as source, a Golay-Cell as detector, and an oscilloscope as data acquisition unit. The system software based mostly on the oscilloscope is intended to control the thing movement, and therefore the capture and show of the continuous THz wave image information. The imaging of different objects is tested at the frequencies of 450 GHz and 890 GHz to show the validity of the imaging system at room temperature. The influence of object's humidity and thickness, incident wavelength, and translation step on the THz imaging is discussed in details. The direct grey level transformation methodology and therefore the histogram equalization methodology are adopted to method the first data to get high-quality THz images.

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