研究目的
Investigating the hyperspectral terahertz tomography in amplitude contrast using a time-domain spectroscopy system to understand the combined contribution of Beer-Lambert volume attenuation, Fresnel reflection losses, and Rayleigh roughness scattering losses.
研究成果
The hyperspectral THz tomography approach allows for the generation of images in amplitude attenuation contrast, with the contour of objects becoming a prominent feature at certain wavelengths. The combined model of Beer-Lambert volume attenuation, Fresnel reflection losses, and roughness scattering losses agrees well with experimental results. This method is useful for applications where capturing the object's contour is a priority.
研究不足
The use of iris diaphragms reduces the signal, affecting the noise performance. The dynamic range is limited to 25 dB in the operating range. The model's application to complex and composite objects is complicated by variations in incidence angles and surface roughness.
1：Experimental Design and Method Selection:
Utilizes a THz time-domain spectroscopy system for hyperspectral imaging in the range 0.3 - 2.5 THz. Standard filtered backprojection is used for image reconstruction.
2：3 - 5 THz. Standard filtered backprojection is used for image reconstruction. Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Test objects made of Styrofoam with varying porosity are scanned. Data is acquired by moving the object across the THz beam waist and rotating it to acquire projections at different angles.
3：List of Experimental Equipment and Materials:
Includes a Ti:Sapphire laser, GaAs photoconductive antenna, ZnTe crystal for detection, and various optical components like a quarter-wave plate and Wollaston prism.
4：Experimental Procedures and Operational Workflow:
The object is scanned transversally with 1 mm steps, and projections are acquired at 25 angles from 0° to 180°. The reconstruction area is 65 mm by 65 mm.
5：0°. The reconstruction area is 65 mm by 65 mm. Data Analysis Methods:
5. Data Analysis Methods: The Fourier transformed signal data is used for reconstruction. The combined effects of volume attenuation, reflection losses, and surface roughness are analyzed.
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Ti:Sapphire laser
MIRA 900
Coherent
Produces 150 fs pulses @ 76 MHz with 800 nm wavelength for generating THz pulsed radiation.
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solid-state laser
Verdi V18
Coherent
Pumps the Ti:Sapphire laser.
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Wollaston prism
WP10
Thorlabs
Used to analyze the signal in conjunction with a quarter-wave plate and balanced detector.
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GaAs photoconductive antenna
400 μm
Generates the THz pulsed radiation when biased at 180 V DC and electronically modulated at 10 kHz.
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ZnTe crystal
2 mm thick
Used for electro-optic sampling to detect the THz pulsed radiation.
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quarter-wave plate
10RP14-28
Newport
Used to analyze the signal in conjunction with a Wollaston prism and balanced detector.
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balanced detector
2007
Newport
Used to analyze the signal in conjunction with a quarter-wave plate and Wollaston prism.
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lock-in amplifier
7265
Signal Recovery
Used for demodulation of the signal.
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