Design of low noise imaging system

2017 ◽  
Author(s):  
Xiaolai Chen ◽  
Bo Hu
Keyword(s):  
Imaging System ◽  
Low Noise

Multi-band Terahertz Imaging System Design

2005 ◽  
Vol 872 ◽  
Author(s):  
Liviu Popa-Simil
Keyword(s):  
Imaging System ◽  
Far Infrared ◽  
Electronic System ◽  
Low Noise ◽  
Molecular Structures ◽  
Resonant Structures ◽  
Field Amplification ◽  
Imaging System Design ◽  
Solid Liquid ◽  
Multi Band

AbstractDeveloping visualization devices in far infrared reveals tremendous advantages and focused the research of space agencies, defense and security as well many other private companies oriented to science. The THz wave emitters and receivers are less developed, compared to its neighboring bands (microwave and optical). During the past decade, THz waves have been used to characterize the composition and properties of solid, liquid and gas phase materials to identify their molecular structures. At the base of this development stays the possibility of achieving microstructures from conductive or super-conductive materials able to select by resonant criteria the emerging photons and drive into specialized detection devices. The problem to be solved is the ratio S/N because the energy of a single 1THz photon is 4.1 meV equivalent to a 47K temperature.A group of such highly selective micro-antenna can be grouped into a unit cell - called elementary multi-band detector. The development of resonant structures for frequency selectivity and directivity reasons coupled with the electrical field amplification and detection in low noise quantum transistors. Such an electronic system might be integrated in a modular structure and by multiplicity to create spatial sensors and phased arrays.

Large-area low-noise amorphous silicon imaging system

1998 ◽  
Author(s):  
Raj B. Apte ◽  
Robert A. Street ◽  
Steve E. Ready ◽  
David A. Jared ◽  
Andrew M. Moore ◽  
...  
Keyword(s):  
Amorphous Silicon ◽  
Imaging System ◽  
Low Noise ◽  
Large Area

TAGUCHI METHOD-BASED OPTIMIZATION OF THE MINIMUM DETECTABLE DIFFERENCE OF A CARDIAC X-RAY IMAGING SYSTEM USING A PRECISE LINE PAIR GAUGE

2019 ◽  
Vol 19 (07) ◽  
pp. 1940030 ◽  
Author(s):  
LUNG-FA PAN ◽  
KENG-YI WU ◽  
KE-LIN CHEN ◽  
SAMRIT KITTIPAYAK ◽  
LUNG-KWANG PAN
Keyword(s):  
Spatial Resolution ◽  
Imaging System ◽  
Low Noise ◽  
Optimal Combination ◽  
Line Pair ◽  
Test Analysis ◽  
X Ray ◽  
X Ray Imaging ◽  
Detectable Difference ◽  
Minimum Detectable Difference

Objective: To optimize the minimum detectable difference (MDD) of a cardiac X-ray imaging system using the Taguchi L8(27) analysis and a precise line pair (LP) gauge. Methods: The optimal combination of the four critical factors of the cardiac X-ray imaging system, namely X-ray focus, kilovoltage (kVp), milliamper-seconds (mAs) and source image distance (SID), providing the MDD was calculated via the Taguchi analysis and experimentally verified. Two (low and high) levels were assigned for each factor, and eight combinations of four factors were used to acquire instant X-ray images using an NDT commercial LP gauge (with a gauge length of 64[Formula: see text]mm and a width of [Formula: see text][Formula: see text]mm). The latter had five lines and was split gradually from top to bottom for the inspection of X-ray images, whose quality was ranked by three well-trained radiologists according to the double-blind criterion. The ranking grade was given by sharp contrast, low noise and precision to distinguish the LP. Accordingly, the MDD was derived to represent the spatial resolution of instant X-ray images by the revised Student’s [Formula: see text]-test analysis. The optimal combination of factors was experimentally identified and clinically verified in the follow-up inspections. Results: For the conventional setting, Group No. 7 (which obtained the highest grade among eight groups) and the optimal setting, the obtained MDD values were [Formula: see text], [Formula: see text] and [Formula: see text][Formula: see text]mm, respectively, while the LP (line pair/mm) interpolated from the gauge scale amounted to [Formula: see text], [Formula: see text] and [Formula: see text][Formula: see text]LP/mm, respectively. Conclusion: The Taguchi L8 analysis was proved to be instrumental in optimizing the cardiac X-ray imaging system MDD and is recommended to be used jointly with the revised Student’s [Formula: see text]-test analysis for improving the spatial resolution of instant X-ray images.

scholarly journals Infrared Array Detectors: Performance and Prospects

1995 ◽  
Vol 167 ◽  
pp. 69-78
Author(s):  
Ian S. McLean
Keyword(s):  
Near Infrared ◽  
Imaging System ◽  
State Of The Art ◽  
Low Noise ◽  
Infrared Images ◽  
Near Ir ◽  
Array Detectors ◽  
And Performance ◽  
Compare And Contrast ◽  
Infrared Array

Infrared array detectors, like silicon CCDs a decade before, have revolutionized infrared astronomy. The quality and performance of the current generation of devices has already allowed astronomers to obtain infrared images at wavelengths out to 2.2 microns which are as deep as the best CCD images. High resolution infrared spectroscopy is now a reality and ground-based imaging to 35 microns has been achieved. Several classes of low-noise infrared array detectors with formats of 256 × 256 pixels are now in routine use, and developments are under way which will produce detectors of 1024 × 1024 pixels (for the near IR) within the next year. This paper will briefly review the state-of-the-art and compare and contrast the properties of available arrays. Progress in the field is illustrated with recent near infrared photometry obtained with a new two-channel imaging system developed at UCLA.

scholarly journals Miniaturized 0.13-μm CMOS Front-End Analog for AlN PMUT Arrays

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1205 ◽  
Author(s):  
Iván Zamora ◽  
Eyglis Ledesma ◽  
Arantxa Uranga ◽  
Núria Barniol
Keyword(s):  
Integrated Circuit ◽  
Imaging System ◽  
Ultrasonic Transducer ◽  
Low Noise ◽  
Oxide Semiconductor ◽  
Cmos Process ◽  
Axial Distance ◽  
Cmos Integrated Circuit ◽  
Front End ◽  
Analog Front End

This paper presents an analog front-end transceiver for an ultrasound imaging system based on a high-voltage (HV) transmitter, a low-noise front-end amplifier (RX), and a complementary-metal-oxide-semiconductor, aluminum nitride, piezoelectric micromachined ultrasonic transducer (CMOS-AlN-PMUT). The system was designed using the 0.13-μm Silterra CMOS process and the MEMS-on-CMOS platform, which allowed for the implementation of an AlN PMUT on top of the CMOS-integrated circuit. The HV transmitter drives a column of six 80-μm-square PMUTs excited with 32 V in order to generate enough acoustic pressure at a 2.1-mm axial distance. On the reception side, another six 80-μm-square PMUT columns convert the received echo into an electric charge that is amplified by the receiver front-end amplifier. A comparative analysis between a voltage front-end amplifier (VA) based on capacitive integration and a charge-sensitive front-end amplifier (CSA) is presented. Electrical and acoustic experiments successfully demonstrated the functionality of the designed low-power analog front-end circuitry, which outperformed a state-of-the art front-end application-specific integrated circuit (ASIC) in terms of power consumption, noise performance, and area.

The LCLS variable-energy hard X-ray single-shot spectrometer

2016 ◽  
Vol 23 (1) ◽  
pp. 3-9 ◽  
Author(s):  
David Rich ◽  
Diling Zhu ◽  
James Turner ◽  
Dehong Zhang ◽  
Bruce Hill ◽  
...  
Keyword(s):  
Imaging System ◽  
Low Noise ◽  
Single Shot ◽  
X Ray ◽  
Performance Improvements ◽  
Spatially Resolved ◽  
Optical Imaging System ◽  
And Performance ◽  
Thin Crystal ◽  
Variable Energy

The engineering design, implementation, operation and performance of the new variable-energy hard X-ray single-shot spectrometer (HXSSS) for the LCLS free-electron laser (FEL) are reported. The HXSSS system is based on a cylindrically bent Si thin crystal for dispersing the incident polychromatic FEL beam. A spatially resolved detector system consisting of a Ce:YAG X-ray scintillator screen, an optical imaging system and a low-noise pixelated optical camera is used to record the spectrograph. The HXSSS provides single-shot spectrum measurements for users whose experiments depend critically on the knowledge of the self-amplified spontaneous emission FEL spectrum. It also helps accelerator physicists for the continuing studies and optimization of self-seeding, various improved mechanisms for lasing mechanisms, and FEL performance improvements. The designed operating energy range of the HXSSS is from 4 to 20 keV, with the spectral range of order larger than 2% and a spectral resolution of 2 × 10−5or better. Those performance goals have all been achieved during the commissioning of the HXSSS.

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