摘要:
Disclosed is a detector array comprising a first linear array for detecting a first ray and a second ray which penetrate through a first plurality of parts of the inspected object to acquire first values and second values for the first plurality of parts, wherein the second ray is alternately emitted with the first ray; and a second linear array arranged parallel to the first linear array for detecting the first ray and the second ray which penetrate through a second plurality of parts of the inspected object to acquire third values and fourth values for the second plurality of parts, wherein the first plurality of parts is partly identical to the second plurality of parts. With the detector array, the efficiency and material discrimination accuracy can be improved in the scanning inspection of the inspected object by use of alternate dual-energy rays.
摘要:
A cargo security inspection method and system based on spiral scanning, the method including: spirally scanning an inspected object at a first precision to obtain the transmission projection data; judging whether there is a suspect area in the inspected area; scanning at least one slice of the suspect area at a second precision wherein the second precision is greater than the first precision; reconstructing a tomographic image of the at least one slice; and using the reconstructed tomographic image to judge whether there is any dangerous article in the suspect area.
摘要:
Disclosed is a multi-array detector module structure pertaining to the technical field of radiation detecting. The multi-array detector module structure comprises a casing, a bottom plate to which a bottom end of the casing is fixedly connected, and a multi-array detector composed of a plurality of detectors, wherein a mounting frame is disposed on the bottom plate, and the mounting frame includes an upper plate and a lower plate. The multi-array detector comprises two rows of peripheral detector arrays fixed to the upper plate and the lower plate of the mounting frame, respectively, and at least one row of middle detector array disposed between the two rows of peripheral detector arrays and fixed to the same. Heavy metal sheets are provided between respective detector arrays in respective rows of detector arrays, for reducing cross talk. Furthermore, heavy metal plates are provided between the two rows of peripheral detector arrays and the upper plate and the lower plate of the mounting frame, respectively, for reducing diffusion. Compared with the prior art, the present invention can achieve remarkable economic benefit by slightly improving the structure with low investment. The present invention further has advantages of a simple structure and convenience in installation and maintenance.
摘要:
The present invention discloses a lifting apparatus, comprising: a vertical guide device; a turntable device which is movable along the vertical guide device upwards or downwards; and a first driving device which drives the turntable device moving in an upward and downward direction guided by the vertical guide device. Wherein said turntable device comprises: a bracket which is slidably engaged with the vertical guide device and projects perpendicularly toward a side of the vertical guide device; a turntable which is rotatably provided on the bracket; and a second driving device which rotates the turntable on the bracket. The present invention further discloses a safety inspection system comprising the lifting apparatus. Compared with prior art, the present invention combines a rotating mechanism and a lifting mechanism as a single apparatus, thus, realizing the self rotation and elevation of the objects to be detected. Thus the present invention has the beneficial features, such as high movement precision, high transmission efficiency, low friction resistance and reduced noise etc.
摘要:
The present invention discloses a method for performing CT imaging on a region of interest of an object under examination, comprising: acquiring the CT projection data of the region of interest; acquiring the CT projection data of region B; selecting a group of PI line segments covering the region of interest, and calculating the reconstruction image value for each PI line segment in the group; and combining the reconstruction image values in all the PI line segments to obtain the image of the region of interest. The present invention further discloses a CT imaging device using this method and a data processor therein. Since the 2D/3D slice image of the region of interest can be exactly reconstructed and obtained as long as the X-ray beam covers the region of interest and the region B, it is possible to use a small-sized detector to perform CT imaging on the region of interest at any position of a large-sized object, which reduces to a great extent the radiation dose of the X-ray during the CT scanning.
摘要:
A method for imaging an object by means of photoneutron transmission is provided. The method determines the position of the photoneutron rays based on the position of a neutron collimator, to overcome the problem of incapability of imaging due to loss of position information of the photoneutrons during moderation thereof. The method also images the object by arranging detector module arrays.
摘要:
The present invention discloses a radiation detector, an imaging device and an electrode structure thereof, and a method for acquiring an image. The radiation detector comprises: a radiation sensitive film, a top electrode on the radiation sensitive film, and an array of pixel units electrically coupled to the radiation sensitive film. Each pixel unit comprises: a pixel electrode (which is configured to collect a charge signal in a pixel area of the radiation sensitive film), a storage capacitor, a reset transistor, a buffer transistor, a column strobe transistor, and a row strobe transistor. The column strobe transistor and the row strobe transistor are connected in series between the buffer transistor and the signal line, and transfer the voltage signal of the corresponding pixel unit in response to a column strobe signal and a row strobe signal. The radiation detector may be used for, for example, X-ray digital imaging.
摘要:
A method and system for detecting special nuclear materials are disclosed. Said method and system detect the special nuclear materials by making use of the photofission characteristic and thermal neutron induced fission characteristic thereof. In one preferred embodiment, the high density and/or high atomic number region in the object to be detected is also detected first as a suspicious region.
摘要:
A boron-coated neutron detector, comprising a cathode tube with a plurality of passages formed therein along its longitudinal direction, the inner wall of each passage being coated with boron material; an electrode wire serving as an anode and arranged longitudinally in each of the passages, the electrode wire adapted to be applied with high voltage; and an insulating end plate to which each end of the cathode tube is fixed, the electrode wire being fixed to the cathode tube via the insulating end plate. Preferably, the cathode tube is formed by jointing a plurality of boron-coated substrates. The boron-coated neutron detector increases the detection efficiency of the neutron detector, which may reach or even exceed the detection efficiency of the 3He neutron detector of the same size, and the cost thereof is much cheaper than the 3He neutron detector.
摘要:
Disclosed is a millimeter-wave receiving device. The device includes at least one radiometer; and a positioning assembly for holding the radiometer, wherein the positioning assembly comprises: a first positioning member having a first surface; a second positioning member having a second surface, the first surface of the first positioning member and the second surface of the second positioning member holding the radiometer in opposite to each other. With the configuration according to the present invention, the at least one radiometer in the millimeter-wave receiving device can be located in all of freedoms on basis of various design requirements of the radiation path to ensure that the radiometer can be arranged in desired receiving positions.