A 32x32-pixel array with in-pixel photon counting and arrival time measurement in the analog domain

The ability to locate a target around a corner is crucial in situations where it is impractical or unsafe to physically move around the obstruction. However, current techniques are limited to long acquisition times as they rely on single-photon counting for precise arrival time measurements. Here, we demonstrate a single-shot non-line-of-sight range-finding method operating at 10 Hz and capable of detecting a moving human target up to distances of 3 m around a corner. Due to the potential data acquisition speeds, this technique will find applications in search and rescue and autonomous vehicles.

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Erratum to “Timepix, a 65 k programmable pixel readout chip for arrival time, energy and/or photon counting measurements” [Nucl. Instr. and Meth. A. 581 (2007) 485–494]

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment ◽

10.1016/j.nima.2007.11.003 ◽

2008 ◽

Vol 585 (1-2) ◽

pp. 106-108 ◽

Cited By ~ 29

Author(s):

X. Llopart ◽

R. Ballabriga ◽

M. Campbell ◽

L. Tlustos ◽

W. Wong

Keyword(s):

Arrival Time ◽

Photon Counting ◽

Nucl Instr

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Speckle Observations of Binary Stars with the MAMA Detector

International Astronomical Union Colloquium ◽

10.1017/s0252921100007119 ◽

1992 ◽

Vol 135 ◽

pp. 549-551

Author(s):

E. Horch ◽

J.S. Morgan ◽

G. Giaretta ◽

John G. Timothy ◽

D.B. Kasle

Keyword(s):

Binary Stars ◽

Binary Systems ◽

Arrival Time ◽

Photon Counting ◽

Diffraction Limit ◽

Image Features ◽

Future Prospects ◽

Imaging Device ◽

Microchannel Array ◽

Magnitude Difference

AbstractWe have made two sets of speckle observations of binary stars with the Multi-Anode Microchannel Array (MAMA) detector. Our observing system is a true photon counting imaging device which records the arrival time of every detected photon. We present speckle autocorrelation analyses of five binary systems, two observed with the 3.6-m telescope at the European Southern Observatory and three observed with the 40-in reflector at Lick Observatory. These five systems represent a wide variation in separation and magnitude difference that indicate that the MAMA detector is capable of recording high quality speckle data at extremely low count rates and can recover image features very near the diffraction limit of the telescope. In one case, only 10 photons per frame were recorded for the dim companion of the system, and in another case, a separation of 0″.157±0″.031 was derived for a system observed with the 40-in telescope where the diffraction limit is about 0″.125. Future prospects for this system are discussed.

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The complex envelope in seismic signal analysis

Bulletin of the Seismological Society of America ◽

10.1785/bssa0650040951 ◽

1975 ◽

Vol 65 (4) ◽

pp. 951-962 ◽

Cited By ~ 3

Author(s):

John S. Farnbach

Keyword(s):

Signal Analysis ◽

Arrival Time ◽

Seismic Signal ◽

Time Measurement ◽

Seismic Signals ◽

Visual Interpretation ◽

Complex Envelope ◽

Seismic Records ◽

Natural Separation ◽

Practical Implications

Abstract Some practical implications of the complex envelope representation of seismic signals are presented. Beginning with a look at an artificially constructed signal and proceeding to seismic records, it is seen that the complex envelope is more amenable to visual interpretation than the real signal itself. This is attributed to the natural separation of amplitude information from angle information afforded by the complex representation, and examples of arrival time measurement and P-coda correlation suggest that this leads to concrete seismological benefits. On this basis, it is suggested that the complex envelope may be a useful tool in seismic signal analysis.

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