Results 251 to 260 of about 178,073 (293)
Some of the next articles are maybe not open access.
2023
We demonstrate a non-contact elastography with low-intensity illumination, mode-selective single photon detection, and acoustic excitation. It probes target samples with milliwatt, picosecond laser pulses and measures the backscattered photons via quantum parametric mode sorting and upconversion detection.
Patrick Rehain +4 more
openaire +1 more source
We demonstrate a non-contact elastography with low-intensity illumination, mode-selective single photon detection, and acoustic excitation. It probes target samples with milliwatt, picosecond laser pulses and measures the backscattered photons via quantum parametric mode sorting and upconversion detection.
Patrick Rehain +4 more
openaire +1 more source
Photon Counting Computed Tomography–Applications
Radiologic Clinics of North America, 2023Photon-counting detector CT (PCCT) is a new technology that has recently emerged as a powerful tool for a more precise, patient-centered imaging. Ever since the FDA approved the first Photon-counting system on September 30, 2021, this new technology raised much interest all over the scientific community and numerous studies have been published in a ...
Ludovica, Lofino, Daniele, Marin
openaire +2 more sources
Photomultiplier Single Photon Counting Efficiency
Applied Optics, 1973An RCA C31000F (8853) photomultiplier with a cathode quantum efficiency of 5.5% (for 633-nm light) was found to have a single photon counting efficiency of only 3.3%. The difference is shown to be due to small pulses well below the single electron peak in the output pulse height spectrum. These pulses are usually below the discriminator threshold level
L, Birenbaum, D B, Scarl
openaire +2 more sources
Photon counting arrays for astrophysics
Journal of Modern Optics, 2007A compact system for counting and time-tagging single photons is presented, based on a monolithic array sensor of 60 pixels able to detect single photons, namely the single-photon avalanche diode array (SPADA). First, the working principle and performance of the single-photon detector pixel is detailed, with particular attention paid to monolithic ...
Zappa F +10 more
openaire +4 more sources
Review of Scientific Instruments, 1985
Two photon counters with variable dead times are described, one of simple design which is suited for low count rates and the other for system dead times down to 2 ns. Cheap, well-known components are used and the counters were designed by computer aid with a criterion that circuit performance be relatively insensitive to component values. An example of
openaire +1 more source
Two photon counters with variable dead times are described, one of simple design which is suited for low count rates and the other for system dead times down to 2 ns. Cheap, well-known components are used and the counters were designed by computer aid with a criterion that circuit performance be relatively insensitive to component values. An example of
openaire +1 more source
Nature Photonics, 2009
The detection of light at the single-photon level is important for tasks ranging from fluorescence imaging to quantum information processing, reports Neil Savage.
openaire +1 more source
The detection of light at the single-photon level is important for tasks ranging from fluorescence imaging to quantum information processing, reports Neil Savage.
openaire +1 more source
Characterizing Single Photons by Photon Counting
Conference on Lasers and Electro-Optics/International Quantum Electronics Conference, 2009We study the ability to measure the non-Gaussian character of the single photon Fock states via direct measurements of the photon number statistics of displaced quantum states.
Kaisa Laiho +3 more
openaire +1 more source
Photon Event Centroiding with UV Photon‐counting Detectors
Publications of the Astronomical Society of the Pacific, 2007We report on photon-counting data taken with a laboratory prototype detector for the ASTROSAT UV imaging telescope, and the selection of the centroiding algorithms and parameter settings for flight. Thresholds are discussed for event recognition. The optimum event centroid algorithm is a 5 × 5 pixel weighted mean, after bias removal accurate to 2%-3 ...
Hutchings, John +3 more
openaire +2 more sources
Photon Counting During an Eclipse
Applied Optics, 1970We have built an instrument that counts pulses from photomultipliers that look at four bands of solar continuum, recording the changes in intensity during an eclipse. We use a plywood spectrograph to select an ultraviolet band and interference filters for the others.
openaire +2 more sources
Igaku butsuri : Nihon Igaku Butsuri Gakkai kikanshi = Japanese journal of medical physics : an official journal of Japan Society of Medical Physics, 2014
Photon counting CT is a new technology that enables us to improve the quality of images by a conventional CT, in which the detection of transmitted photons is conducted by an integration of photon energies. This paper describes the features and advantages of the photon counting detection compared to the energy integration detection.
openaire +1 more source
Photon counting CT is a new technology that enables us to improve the quality of images by a conventional CT, in which the detection of transmitted photons is conducted by an integration of photon energies. This paper describes the features and advantages of the photon counting detection compared to the energy integration detection.
openaire +1 more source