The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The MEG experiment searches for new physics like SUSY-GUT/SUSY-seesaw through lepton flavor violating μ+ → e+γ decay. In order to improve the experimental sensitivity, the detector upgrade project (MEG II) is underway. The 900 liter of liquid xenon (LXe) detector with 846 2 PMTs measures energy, timing, and position of 52.8MeV gamma-ray. The finite size of the PMT produces non-uniform response against...
In this study we proposed a novel design of the stationary multi-pinhole dedicated cardiac SPECT based on clinical dual-head scanner with high sensitivity and low cost for nuclear medicine myocardial perfusion imaging.
The key to reaching SPECT's full diagnostic potential lies in optimizing the imaging geometry to maximize the system geometric efficiency (SGE) at a given resolution. The optimal geometry differs for different imaging applications, for different imaging tasks within a single application, and for different patients. The C-SPECT cardiac SPECT/Tct platform unifies innovative sub-systems in a cardiocentric...
Gas detection apparatus based on SAW/GC was gained by combining Surface Acoustic Wave (SAW) gas sensor with gas chromatography (GC). Because of its features as high sensitivity, more detectable gas types and resolution of crossed-interference, the SAW/GC gas detection apparatus is perfect for the gas composition analysis in the complicated atmosphere background especially. In this paper, the main...
This paper presents for the first time the design, electromagnetic modeling and simulation of a W-band micromachined receiver with a double folded slot antenna. The antenna was processed on a thin dielectric membrane obtained through wet micromachining of a 400 µm thick, high-resistivity silicon substrate. A stand-alone antenna structure was fabricated and characterized in terms of reflection losses,...
This paper investigates the performance of wideband and high sensitivity RF power detectors. A resistive-matching, reactive-matching and distributed detectors are designed and measured. The distributed detector employs an artificial transmission-line structure. A six-stage distributed detector with a characteristic impedance of 205 Ω, is demonstrated to operate from very low frequencies to 3.2 GHz...
Infrared Focal Plane Arrays have been developed with reductions in pixel size below the Nyquist limit imposed by the optical systems Point Spread Function (PSF). These smaller sub diffraction limited pixels allows spatial oversampling of the image. We show that oversampling the PSF allows improved fidelity in imaging, resulting in sensitivity improvements due to pixel correlation, reduced false alarm...
A terahertz detector using an InAlAs/InGaAs high-electron-mobility-transistor (HEMT) integrated with a bow-tie antenna was proposed and fabricated. By utilizing ballistic transport in the short-channel, a current sensitivity of 1.5 A/W at 280 GHz was achieved by the detector having 70-nm T-gate HEMT without applying drain bias. We also measured the drain bias dependence of current sensitivity on the...
Utilizing state-of-the-art TES detector arrays, the SAFARI imaging spectrometer onboard the Japanese SPICA mission will take maximum advantage of a deeply cooled 3m class space telescope, offering the far-infrared astronomical community unprecedented sensitivity, and mapping efficiency, in the 34–210 μm wavelength range filling the gap between JWST and ALMA.
We report our recent work to improve a number of performance attributes of “KIDcam,” a passive THz imaging camera based on frequency multiplexed Lumped Element Kinetic Inductance Detectors (LEKIDs.) The array operates at 250mK but the entire instrument is liquid cryogen-free and can be operated remotely and automatically. It offers high sensitivity throughout the THz region with video rate frame capture...
We discuss some recent astronomical results from the Herschel Space Observatory, and indicate future directions for astronomy and astrophysics enabled by submillimeter/far-infrared observations. A huge amount remains to be done, but it will require improved ground-based, suborbital, and space facilities. New technology enabling large format detectors of different types is also needed. Efforts underway...
Scalp electroencephalogram (EEG), a recording of the brain's electrical activity, has been used to diagnose and detect epileptic seizures for a long time. However, most researchers have implemented seizure detectors by manually hand-engineering features from observed EEG data, and used them in seizure detection, which might not scale well to new patterns of seizures. In this paper, we investigate...
Previous work demonstrated that Kinect sensor can be very useful for fall detection. In this work we present a novel approach to fall detection that allows us to achieve reliable fall detection in larger areas through person detection and tracking in dense depth map sequences acquired by an active pan-tilt 3D camera. We demonstrate that both high sensitivity and specificity can be obtained using dense...
Pedestrian detection has a wide range of applications in visual surveillance, driver assistance systems. It is also very important in computer vision and pattern recognition. In our study, we proposed a multi-scale scheme for pedestrian detection. The scheme of pedestrian detection consisted of two steps for construction a strong classifier and multi-scale detection. The strong classifier, a collection...
This paper presents an automatic calibration system for ISFET chemical sensing arrays to tune out any mismatch in sensitivity. Through exploitation of the high frequency spectrum of the sensed signal which does not contain any chemical reaction information, local sensitivity is examined and then calibrated through a successive approximation control mechanism and an 8-bit variable gain amplifier to...
This study firstly discussed effect of three coil's orientations on sensitivity of low frequency eddy current testing for inspecting wall-thinning of large pipes through experimental signals. One specimen made of carbon steel was prepared. Hollows with different depth were introduced on the bottom of the specimen. Results of experiments showed that sensitivity of low frequency eddy current testing...
Falls in nursing homes and hospitals take often place immediately after a bed exit of a patient. An alarm signaling the exit from the bed may already be too late for staff to react. In this paper we explore the possibilities of detecting the sequences of preparatory movements before the bed exit and in this way create an early warning of the preparation of bed exit. The method is described and tested...
X-ray diffraction is a powerful technique to provide information on the molecular structure of samples. Energy dispersive X-ray diffraction (EDXRD) spectra are classically measured at one single fixed scattering angle using a polychromatic X-ray source and a spectroscopic detector. In order to remove system blurring and restore material proper information, inversion of the EDXRD spectra is required...
It can be difficult to compare the merits of cameras using different sensor technologies using only the specifications typically provided by the manufacturers. The Noise Equivalent Irradiance (NEI) provides a normalized and unique parameter allowing a direct comparison. It is also fairly simple to calculate from the commercial specifications for a given wavelength and exposure time of interest. We...
This paper presents a fingertip detection method that is based on the top-hat transform. A hand is assumed to be segmented in advance. The palm of the hand is obtained using the morphological opening. Fingertips are then obtained as the opening residue, the difference between the input image and the palm image. The performance of the approach is compared with three other techniques: (1) the convex...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.