&lt;title&gt;Passive millimeter-wave video camera&lt;/title&gt;

Yujiri, L.; Agravante, Hiroshi H.; Fornaca, S.; Hauss, B.; Johnson, Ronald L.; Kuroda, Roger T.; Quon, B. H.; Rowe, Arlen W.; Samec, Thomas K.; Shoucri, Merit; Yokoyama, Karen E.

doi:10.1117/12.319397

Cited by 10 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The MTF corresponding to the diffraction PSF is obtained by taking the Fourier transform of the function in Eq. (7). The diffraction MTF is given as follows [17]:…”

Section: Lens Diffraction Psf and Mtfmentioning

confidence: 99%

See 1 more Smart Citation

Optical Performance Analysis Using a Point Spread Function and Modulation Transfer Function for W-Band PMMW Imaging System Based on Quasi Optics Focused Array of Dielectric Rod Waveguide Antenna

Singh

Kim²,

Tiwary³

et al. 2010

PIER B

View full text Add to dashboard Cite

Abstract-The appropriateness of dielectric loaded antenna for the passive millimeter wave imaging application has recently been demonstrated. In this paper, we analyze the optical performance of the passive millimeter wave (PMMW) imaging system based on a 1D focal plane array (FPA) of dielectric rod waveguide (DRW) antennas. A first step in the design process is to analyze the image quality potential of 1D FPA-based imaging system in terms of the point spread function (PSF) and the modulation transfer function (MTF). We consider the effect of lens, DRW antenna, electromagnetic crosstalk between adjacent DRW antenna elements in the array, and sampling. From simulation and measurement, we found that the image quality in the passive millimeter wave imaging system with a DRW antenna array is less sensitive to electromagnetic crosstalk between antenna elements in the array. The measurements and simulations show that the system is diffraction limited and also closely agrees with the Rayleigh criterion of resolution for diffraction limited optical systems.

show abstract

“…The MTF corresponding to the diffraction PSF is obtained by taking the Fourier transform of the function in Eq. (7). The diffraction MTF is given as follows [17]:…”

Section: Lens Diffraction Psf and Mtfmentioning

confidence: 99%

“…This imaging is typically performed using a single or a linear array of the focused detector † to raster scan the scene [4,5]. The PMMW camera was also developed using the same configuration similar to what is commonly used in visible and IR camera [6,7], i.e., the 2D array of the focused detector [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Optical Performance Analysis Using a Point Spread Function and Modulation Transfer Function for W-Band PMMW Imaging System Based on Quasi Optics Focused Array of Dielectric Rod Waveguide Antenna

Singh

Kim²,

Tiwary³

et al. 2010

PIER B

View full text Add to dashboard Cite

show abstract

“…Remarkable successes in the field are reached in England [2], USA [3], and Russia [4,6]. The main result of our developments is a revealed and experimentally realized possibility of IO-fold increasing of spatial resolution of passive radio-vision systems, which content both single-element receiver and sensor arrays.…”

Section: Problems and Ways Of Their Solutionmentioning

confidence: 89%

Passive radio imaging in 8-mm and 3-mm ranges

Pirogov

Twenty Seventh International Conference on Infrared and Millimeter Waves

View full text Add to dashboard Cite

It is presented results of radio imaging investigations in the Moscow University. Some facilities of 8-mm and 3-mm ranges were developed to demonstrate effectivity of smme superresolution methods. Reached in the 8-mm range super-resolution factor had a value about 10. After processing in 3-mm case, a resolution of passive radio vision facility with moderate s h e of antenna was pmctiely the same as in optics.

show abstract

A technique for the fast raster‐scanned motion of a small window for millimeter‐wave image acquisition

Soto

Dávila

2002

Micro & Optical Tech Letters

View full text Add to dashboard Cite

Millimeter-wave imaging has recently become a vigorous research area because of its demonstrated ability to see under a variety of adverse environmental conditions, such as fog, clouds, snow, smoke, rain, etc., as well as through walls, w x doors, and most common clothing materials 1᎐4 . Among the civilian applications being developed for imaging in this spectral range are contraband and concealed weapon detection, through-wall imaging, surveillance within buildings, remote forest-fire detection, underground metal detection, lowvisibility autonomous landing of aircrafts, and many more.For short-range applications, both active and passive imaging systems are being perfected. In active imaging, the object is illuminated with a source of millimeter waves, and a large lens or a focusing mirror is used to form an image of the object with the power reflected by it. In passive imaging, the electromagnetic power is thermally emitted by the object, and a focusing element forms an image of it. For longrange applications, mostly passive imaging systems are being developed.Once the image is formed, either actively or passively, there are several methods for acquiring it. Early systems used single detectors at the focal plane, the detector being mechanically scanned across the scene of interest. Due principally to the slow mechanical scan motion, these systems took tens of minutes to take single-frame images. The present goal in millimeter-wave imaging research is to drastically reduce the image acquisition time in order to approach TV frame rates. One of the important approaches being investigated to reach this goal is the use of focal plane solid-state arrays with individualized amplification and detection. The other important approach is the combination of raster motion and a single receiver channel. The raster motion is either of the image in front of a fixed receiver by means of a flapping w x reflector 1, 5 or of the receiver in front of a fixed image w x 3, 6 .Although millimeter-wave imaging may be mostly dominated in the future by focal plane arrays, there are, however, several problems associated with them, like high cost, large Contract grant sponsor: CONACYT Contract grant number: 25789-A size, cryogenic cooling, complexities associated with interw x channel gain stability, and others 1, 3 , so that, as present, the field remains dominated by scanned systems; however, their success awaits the discovery of a compact and efficient w x scanner capable of achieving video rates 3 .In this work, we propose a new scheme for raster-scanned image acquisition in which neither the image nor the single channel receiver has to be scanned, and whose maximum frame rate will be determined ultimately by the speed and sensitivity of the single-channel receiver, and not by mechanical-motion limitations. The two principal components in this new scheme are a Nipkow disk and an integrating sphere. The Nipkow disk, which is utilized for scanning, is provided with a number of spirally distributed sampling apertures. Historically, it was ...

show abstract

<title>Passive millimeter-wave video camera</title>

Cited by 10 publications

References 11 publications

Optical Performance Analysis Using a Point Spread Function and Modulation Transfer Function for W-Band PMMW Imaging System Based on Quasi Optics Focused Array of Dielectric Rod Waveguide Antenna

Optical Performance Analysis Using a Point Spread Function and Modulation Transfer Function for W-Band PMMW Imaging System Based on Quasi Optics Focused Array of Dielectric Rod Waveguide Antenna

Passive radio imaging in 8-mm and 3-mm ranges

A technique for the fast raster‐scanned motion of a small window for millimeter‐wave image acquisition

Contact Info

Product

Resources

About