Handheld Millimeter-Wave Imaging at Video Rates and its Applications

Hussung, Raphael; Mohammadzadeh, Shiva; Čibiraitė-Lukenskienė, Dovilė; Keil, Andreas; Friederich, Fabian

doi:10.1109/iwat54881.2022.9811003

Cited by 3 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Currently, we are aiming towards building a setup, which applies a SiGe-MMIC multi-channel array not only in the detector plane but also as a transmitter unit. We already performed promising preliminary measurements with a system featuring two multi-channel arrays [ 37 ]. The system could potentially allow the elimination of any mechanical movement (other than rotating the sample), but the high density and the resulting small aperture of the transmitting antennas lead to strongly diverging emitter characteristics and suboptimal resolution.…”

Section: Discussion and Outlookmentioning

confidence: 99%

Coherent Off-Axis Terahertz Tomography with a Multi-Channel Array and f-theta Optics

May,

Mohammadzadeh,

Keil

et al. 2024

Sensors

View full text Add to dashboard Cite

Terahertz tomography is a promising method among non-destructive inspection techniques to detect faults and defects in dielectric samples. Recently, image quality was improved significantly through the incorporation of a priori information and off-axis data. However, this improvement has come at the cost of increased measurement time. To aim toward industrial applications, it is therefore necessary to speed up the measurement by parallelizing the data acquisition employing multi-channel setups. In this work, we present two tomographic frequency-modulated continuous wave (FMCW) systems working at a bandwidth of 230–320 GHz, equipped with an eight-channel detector array, and we compare their imaging results with those of a single-pixel setup. While in the first system the additional channels are used exclusively to detect radiation refracted by the sample, the second system features an f-θ lens, focusing the beam at different positions on its flat focal plane, and thus utilizing the whole detector array directly. The usage of the f-θ lens in combination with a scanning mirror eliminates the necessity of the formerly used slow translation of a single-pixel transmitter. This opens up the potential for a significant increase in acquisition speed, in our case by a factor of four to five, respectively.

show abstract

Section: Discussion and Outlookmentioning

confidence: 99%

Coherent Off-Axis Terahertz Tomography with a Multi-Channel Array and f-theta Optics

May,

Mohammadzadeh,

Keil

et al. 2024

Sensors

View full text Add to dashboard Cite

show abstract

“…Currently, we are aiming towards building a setup, which applies a SiGe-MMIC multi-channel array not only in the detector plane but also as a transmitter unit. We already performed promising preliminary measurements with a system featuring two multi-channel arrays [27][28][29]. The system could potentially allow the elimination of any mechanical movement (other than rotating the sample), but the high density and the resulting small aperture of the transmitting antennas lead to strongly diverging emitter characteristics and suboptimal resolution.…”

Section: Discussion and Outlookmentioning

confidence: 99%

Coherent Off-Axis Terahertz Tomography with a Multi-Channel 2 Array and F-theta Optics

May,

Mohammadzadeh,

Keil

et al. 2023

Preprint

View full text Add to dashboard Cite

Terahertz tomography is a promising method among non-destructive inspection techniques to detect faults and defects in dielectric samples. Image quality recently significantly improved through the incorporation of a priori information and off-axis data. However, this improvement has come at the cost of increased measurement time. To aim toward industrial applications, it is therefore necessary to speed up the measurement by parallelizing the data acquisition employing multi-channel setups. In this work, we present two tomographic frequency-modulated continuous wave (FMCW) systems working at a bandwidth of 230-320 GHz, equipped with an eight-channel detector array, and compare their imaging results with a single-pixel setup. While in the first system, the additional channels are used exclusively to detect radiation refracted by the sample, the second system features an f-θ lens, focusing the beam at different positions on its flat focal plane, and thus utilizing the whole detector array directly. The usage of the f-θ lens in combination with a scanning mirror eliminates the necessity of the formerly used slow translation of a single-pixel transmitter. This opens up the potential for a significant increase in acquisition speed, in our case by a factor of four to five, respectively.

show abstract