摘要:
A method of calibrating a pixelated radiation detector containing a plurality of pixel detectors electrically connected to a plurality of respective read-out channels of detector read-out circuitry includes determining a sensor material deadtime, τsensor, for each of the plurality of pixel detectors, and adjusting the respective read-out channel deadtime, τASIC, based on the determined sensor material deadtime, τsensor, of the respective one of the plurality of pixel detectors, such that a total deadtime, τtotal of each pixel detector including a sum of the respective sensor material deadtime, τsensor, and the respective read-out channel deadtime, τASIC, varies by less than ±5% from each other.
摘要:
An array (1) for detecting electromagnetic radiation is provided for a radiographic inspection system (20). The array has a plurality of detector elements (2) arranged consecutively along a scan line which extends in a first direction (Y). Each of the detector elements has a detection surface (3) for receiving electromagnetic radiation and converting the received electromagnetic radiation into a corresponding detection signal. Each detection surface (3) has a surface normal (4, N) that extends in a common plane (S) and converges into a common focus (5). The common plane (S) extends in the first direction (Y). The distances between the common focus and the detection surfaces along the respective surface normal (4, N) are different for at least two detector elements.
摘要:
The present specification provides a detector for an X-ray imaging system. The detector includes at least one high resolution layer having high resolution wavelength-shifting optical fibers, each fiber occupying a distinct region of the detector, at least one low resolution layer with low resolution regions, and a single segmented multi-channel photo-multiplier tube for coupling signals obtained from the high resolution fibers and the low resolution regions.
摘要:
The invention provides a system and method for characterising at least part of a material comprising: a source of incident X-rays (4, 28) configured to irradiate at least part of the material; one or more detectors (300,302,312,1701,1704,1600,1607,1608,1604) adapted to detect radiation emanating from within or passing through the material as a result of the irradiation by the incident radiation (1700) and thereby produce a detection signal (313); and one or more digital processors (304-311,2000-2009) configured to process the detection signal (313) to characterise at least part of the material; wherein the one or more detectors (300,302,312,1701, 1704,1600,1607,1608,1604) and one or more digital processors (304-311,2000-2009) are configured to characterise at least part of the material by performing energy resolved photon counting X-ray transmission spectroscopy analysis.
摘要:
The invention provides a material characterisation system and method for characterising a stream of material emanating from a material identification, exploration, extraction or processing activity, the system comprising: a source of incident radiation (64) configured to irradiate the stream of material in an irradiation region (18); one or more detectors (300,302,312,1701,1704,1600,1607,1608,1604) adapted to detect radiation emanating from within or passing through the stream of material as a result of the irradiation by the incident radiation (1700) and thereby produce a detection signal (313); and one or more digital processors (304-311,2000-2009) configured to process the detection signal to characterise the stream of material; wherein the source of incident radiation (64) and the one or more detectors (300,302,312,1701,1704,1600,1607,1608,1604) are adapted to be disposed relative to the stream of material so as to irradiate the stream of material and detect the radiation emanating from within or passing through the stream (1700) as the stream passes through the irradiation region (18).
摘要:
Apparatus for computed tomography is described that is also suitable for X-ray diffraction. The computed tomography measurement uses a line focus 8 and passes the X-rays from the line focus through a perpendicular slit 22 and then through a sample onto a two dimensional detector. A plurality of images are taken, each with the sample rotated about a rotation axis 14 by a different amount, and combined to create a computed tomography image.
摘要:
A device and method for testing a fiber-composite component, which is to be processed by means of bonding, for the presence of at least one substance out of a selection of possible contaminants. A surface heating device for regional heating of a part-zone of the fiber-composite component to be bonded is performed for desorption of contaminants. A sensor array with a plurality of sensors detects contaminants in the gas phase, and a control device ascertains and signals contaminations which are found. An extractor device can be employed to extract machining dust from the fiber-composite component to a desorption device.
摘要:
A scanning method which is a method of identifying a change in the density of an object includes arranging a source of ionizing radiation and an array of radiation detectors Dn, where n is an integer from 1 to N, capable of detecting the radiation in such a way that radiation counts are counted by the detectors as the source and detectors are rotated around the object and normalized counts values are collated in a matrix such that a pattern may be detected within the matrix from which the presence of a change in the density of the object at a location lying on at least one of the radiation paths may be inferred.
摘要:
A photon count-based radiation imaging system. The invention also relates to a method of implementing X-ray imaging in said system, and to key apparatus of said system. In the system, an x-ray source directs x-rays at a sample on a scanning platform. When the x-rays pass through said sample, photons carrying information about characteristics of the material at various spatial positions are produced. A photon count detector counts the photons on an imaging plane, obtains incident photon projection data and energy data, and transmits same to a 3D reconstruction system. The 3D reconstruction system reconstructs, on the basis of said projection data and energy data, the 3D structure and the matter composition inside the sample, then performs digital dyeing on the component parts of the sample, thereby differentiating the matter composition of the sample.
摘要:
An x-ray detector of a grid-based phase-contrast x-ray device and a method for operating a grid-based phase-contrast x-ray device. Signal values of detector elements are combined to form group signal values. An image computing unit calculates an x-ray beam phase value from the group signal values.