1.56 Terahertz 2-frames per second standoff imaging

Goyette, Thomas M.; Dickinson, Jason C.; Linden, Kurt J.; Neal, William R.; Joseph, Cecil S.; Gorveatt, William J.; Waldman, J.; Giles, Robert H.; Nixon, William E.

doi:10.1117/12.764672

Cited by 18 publications

(12 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These systems use different techniques for image acquisition. High-speed mechanical scanning is the selected strategy for systems such as [7], [10], [12], [13], and the present system [14], and those based on galvanometers [15], [16]. Another imaging technique is synthetic aperture focusing applied to systems such as [17].…”

mentioning

confidence: 99%

3-D High-Resolution Imaging Radar at 300 GHz With Enhanced FoV

Grajal

Badolato

Rubio-Cidre

et al. 2015

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

We have developed a 3-D high-resolution radar at 300 GHz with a cell resolution of 1 1.6 1.6 cm at a standoff distance of 8 m for security applications. The selection of an operating frequency of 300 GHz, a bandwidth of 27 GHz, and a field of view of 50 90 cm improves the through-clothes imaging of person-borne concealed objects. The radar's antenna design allows single-pixel imaging at a frame rate of two frames per second. A reduction in cost and power consumption and improvements in image quality are additional requirements taken into account in the design of this radar system.Index Terms-Continuous-wave linear-frequency modulation (CW-LFM), field of view (FoV), imaging radar, millimeter wave.

show abstract

mentioning

confidence: 99%

3-D High-Resolution Imaging Radar at 300 GHz With Enhanced FoV

Grajal

Badolato

Rubio-Cidre

et al. 2015

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…Meanwhile, in most THz optical systems for security screening, the objects are placed far from the THz optical system so that a large fnumber objective can give rise to low-resolution images, even if they have large imaging speeds [14]. In some ways, this can be rather helpful because of privacy issues associated with the security system.…”

Section: Introductionmentioning

confidence: 99%

“…However, the intrinsically low speed caused by the galvanometer mirror with a large aperture should be improved by substituting it with faster steering tools [12,[14][15][16].…”

Section: Introductionmentioning

confidence: 99%

High-performance sub-terahertz transmission imaging system for food inspection

Ok¹,

Park²,

Chun³

et al. 2015

Biomed. Opt. Express

View full text Add to dashboard Cite

Unlike X-ray systems, a terahertz imaging system can distinguish low-density materials in a food matrix. For applying this technique to food inspection, imaging resolution and acquisition speed ought to be simultaneously enhanced. Therefore, we have developed the first continuous-wave sub-terahertz transmission imaging system with a polygonal mirror. Using an f-theta lens and a polygonal mirror, beam scanning is performed over a range of 150 mm. For obtaining transmission images, the line-beam is incorporated with sample translation. The imaging system demonstrates that a pattern with 2.83 mm line-width at 210 GHz can be identified with a scanning speed of 80 mm/s.

show abstract

“…Moreover, our design leaves open the possibility of zooming the THz beam's focal point throughout a swath of near field distances in order to attain high quality imagery of targets over a long span of standoff ranges. The idea of using a small rotating mirror in order to increase the imaging acquisition time has already been used in several existing active THz imagers [7]- [9]. In [7] and [8], a telecentric lens design is used to focus each target pixel into a collimated beam.…”

mentioning

confidence: 99%

“…The idea of using a small rotating mirror in order to increase the imaging acquisition time has already been used in several existing active THz imagers [7]- [9]. In [7] and [8], a telecentric lens design is used to focus each target pixel into a collimated beam. The collimated beams can be steered with a small mirror towards the frontand back-end electronics.…”

mentioning

confidence: 99%

Confocal Ellipsoidal Reflector System for a Mechanically Scanned Active Terahertz Imager

Llombart

Cooper

Dengler

et al. 2010

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

Abstract-We present the design of a reflector system that can rapidly scan and refocus a terahertz beam for high-resolution standoff imaging applications. The proposed optical system utilizes a confocal Gregorian geometry with a small mechanical rotating mirror and an axial displacement of the feed. For operation at submillimeter wavelengths and standoff ranges of many meters, the imaging targets are electrically very close to the antenna aperture. Therefore the main reflector surface must be an ellipse, instead of a parabola, in order to achieve the best imaging performance. Here we demonstrate how a simple design equivalence can be used to generalize the design of a Gregorian reflector system based on a paraboloidal main reflector to one with an ellipsoidal main reflector. The system parameters are determined by minimizing the optical path length error, and the results are validated with numerical simulations from the commercial antenna software package GRASP. The system is able to scan the beam over 0.5 m in cross-range at a 25 m standoff range with less than 1% increase of the half-power beam-width.

show abstract

1.56 Terahertz 2-frames per second standoff imaging

Cited by 18 publications

References 6 publications

3-D High-Resolution Imaging Radar at 300 GHz With Enhanced FoV

3-D High-Resolution Imaging Radar at 300 GHz With Enhanced FoV

High-performance sub-terahertz transmission imaging system for food inspection

Confocal Ellipsoidal Reflector System for a Mechanically Scanned Active Terahertz Imager

Contact Info

Product

Resources

About