65results about How to "Guaranteed Spatial Resolution" patented technology

The invention relates to a digital X-ray flat panel detector based on a lead iodide photoconductive layer. The detector comprises a matrix thin film transistor glass substrate, the photoconductive layer and a top electrode layer, wherein the photoconductive layer is disposed on the matrix thin film transistor glass substrate and the top electrode layer is disposed on the surface of the photoconductive layer. The digital X-ray flat panel detector has the advantages that a lead iodide material layer is used as the photoconductive layer, X-ray photons are directly converted into charge signals to achieve digital X-ray imaging, the lead iodide material layer is good in structure and performance and simple in preparation process, and low-cost, large-area, continuous and stable preparation with large-thickness requirements can be achieved easily; radiation medical imaging cost and non-destructive detection imaging cost can be lowered, and the detector can be popularized in the fields of radiation imaging.

The invention provides a superspeed dual-frame image acquisition method which comprises exposure time control and CCD high-speed dual-frame image acquisition. The CCD exposure time control process realizes conduction or blocking of incident light through an image intensifier and is mainly used for adjusting the lengths of two-time exposure time, starting or ending exposure of CCD photosensitive area pixels. The CCD high-speed dual-frame image acquisition process mainly relates to a particular CCD charge transferring method and a timing sequence driving method. Different from the regular CCD working process, during the CCD high-speed dual-frame image acquisition process, CCD firstly carries out double exposure, stores photogenerated charges generated by the double exposure into the photosensitive area pixels and a vertical register respectively, and continuously outputs dual frame images finally. According to the superspeed dual-frame image acquisition method, the time interval for gathering the two frame images is only related to the time for transferring the photogenerated charge exposed for the first time to the vertical register and can reach 100ns scale.

The invention relates to a rapid three dimensional appearance measuring method and apparatus thereof. The method comprises the following steps: 1) coding the projection lines by computer and inputting the result into the projection equipments; 2) collecting the projection line images; 3) dividing out the projection lines in the demarcating image and the measuring image and determining the position of the center projection line; 4) recognizing the projection line code by using mode recognition method; 5) comparing the demarcating image and the measuring image to obtain height difference data of the corresponding points between the demarcating image and the measuring image; 6) adjusting the height difference data of the corresponding points of the demarcating image and the measuring image, and combining the height difference data of the projection equipments into the final three dimensional appearance data to abtain the three dimensional appearance measuring result. the multi-line projection coding method is a pseudorandom sequence coding of the space containing redundant codes; the constrained conditions is the single coding condition that the same coding of adjacent projection line appears only onec; the redundant code is time pseudorandom sequence coding, is used for verifying the correctness of the spatial pseudorandom sequence coding recognized in the step 4).

The application relates to a method and a device for acquiring soil moisture information, computer equipment and a storage medium. The method comprises the following steps: acquiring vegetation indexinformation and multi-source surface temperature information of a target area, wherein the multi-source surface temperature information at least includes first surface temperature information and second surface temperature information, the first surface temperature information is the surface temperature data of each clear sky day, and the spatial scale of the first surface temperature informationis smaller than the spatial scale of the second surface temperature information; spatially fusing the first surface temperature information and the second surface temperature information according tothe spatial scale of the first surface temperature information, and calculating the fused surface temperature information of the target area; calculating the temperature vegetation drought index information of the target area according to the vegetation index information and the fused surface temperature information; calculating the soil moisture information of the target area according to the temperature vegetation drought index information. By adopting the method, the accuracy of soil moisture information can be improved.

The invention discloses a three-dimensional resonance trigger probe based on a quartz tuning fork and a three-dimensional resonance trigger location method. The three-dimensional resonance trigger probe is characterized in that the quartz tuning fork is used as a micro force sensor, a piezoelectric driver is fixed on a fork arm of the quartz tuning fork, a piezoelectric sensor is fixed on the other fork arm; the quartz tuning fork is vertical to the surface of a sample in the vibration direction on the Z direction and is parallel to the surface of the sample in the vibration direction on X and Y directions, an integrated micro measuring bar measurement ball is fixedly arranged on the fork arm close to one side where the sample is in, and a sine alternating-current signal output by a phase-locked loop is applied to the piezoelectric sensor as an excitation signal, and a fork resonance signal is detected by the piezoelectric sensor. When a micro three-dimensional external force causes that the resonance frequency of the probe changes, the resonance frequency of a quarts tuning fork probe changes, and three-dimensional resonance trigger location of the three-dimensional resonance trigger probe is realized through detecting the change of the resonance frequency of the quartz tuning fork.

The invention discloses a novel Brillouin time domain analyzer, which comprises a pulse detection light generation module, a pump light source module, a first optical coupler, a second optical coupler, a frequency control module, a detection light output and signal processing module and a pump light output module, and is characterized in that: the pulse detection light generation module comprises a laser driving circuit capable of generating electric pulse signals, a narrow line width tunable semiconductor laser, a third optical coupler and an optical fiber amplifier; the laser driving circuit is connected with the frequency control module; the input end of the third optical coupler is connected with the narrow line width tunable semiconductor laser; two output ends of the third optical coupler are respectively connected with the input end of the optical fiber amplifier and another input end of the first optical coupler; and the output end of the optical fiber amplifier is connected with the detection light output and signal processing module. The novel Brillouin time domain analyzer has the advantages of low cost, high spacial resolution, high measurement accuracy and long measurement distance.

The invention provides an optical-frequency-domain-reflection-based long-distance fiber distributed disturbance sensing signal processing method. The method comprises: S1, with an image processing method, noise-reduction enhanced-feature processing is carried out on a measurement signal; and S2, on the basis of a noise reduction method with spatial resolution loss, the disturbance position is highlighted by using low-pass filter noise reduction under the circumstance that the spatial resolution is ensured, so that multi-point disturbance is distinguished. According to the optical-frequency-domain-reflection-based long-distance fiber distributed disturbance sensing signal processing method, the noise is reduced and the disturbance feature information is kept. During multi-point disturbance distinguishing, the spatial-resolution-loss-free noise reduction method is used; and with the low-pass filter noise reduction, the disturbance position is highlighted under the circumstance that the spatial resolution is ensured.

The invention provides an EHz ultrafast modulation pulse scanning laser and a distributed optical fiber sensing system. A doped optical fiber is carved with a plurality of phase shift gratings with different central window wavelengths, and the wavelength interval between adjacent central window wavelengths is a preset fixed value; when pump light emitted by a pump laser source enters the doped optical fiber through the coupling of a wavelength division multiplexer, the phase shift gratings carved on the doped optical fiber can generate multi-wavelength single-mode narrow-linewidth laser with the wavelength interval of the preset fixed value; and then, the ultrafast modulation is finished by a time domain control method based on EOM (Ethernet over coax) to obtain internal variable frequencypulse light formed by continuously splicing a plurality of pulse lights with linearly increasing frequencies, thereby forming the EHz ultrafast modulation of the distributed feedback fiber laser. Therefore, the coherence length of output laser can be increased on the premise that the laser frequency is unchanged, and the problem that the existing distributed optical fiber sensing system is restricted in high spatial resolution, long distance and high frequency band can be effectively solved.

The invention discloses a one-dimensional dual-redundant antenna array and a construction method. The construction method comprises the steps of establishing a design model of the one-dimensional dual-redundant antenna array based on a minimum array redundancy; by utilizing an intelligent optimization algorithm, obtaining a plurality of first antenna arrays which meet the design model; according to an adjacent array element spacing distribution condition of the first antenna arrays, carrying out an expansion operation on the first antenna arrays to obtain a plurality of second antenna arrays; and using the second antenna arrays which meet requirements of the one-dimensional dual-redundant antenna array and have small array redundancies as third antenna arrays, and according to an adjacent array element spacing distribution condition of the third antenna array, obtaining the one-dimensional dual-redundant antenna array with a random number of array elements. The method for constructing the one-dimensional dual-redundant antenna array, which is provided by the invention, solves the problem of large-degree coverage of a sampling frequency under the condition that a single array element is damaged, and provides guarantee for system reliability of a synthetic aperture radiometer in the microwave and millimeter wave radiation measurement application.

The invention provides an optical fiber distributed vibration sensing system based on an envelope detection circuit. The system modulates a divided first path of direct current laser into pulsed lightand sends the pulsed light to a sensing optical fiber; the sensing optical fiber carries out vibration detection based on pulsed light to generate Rayleigh scattering light transmitted backwards, then the second path of direct current laser and the Rayleigh scattering light are coupled to generate two paths of scattering light interference signals with the phase difference of 180 degrees; coherent detection is carried out on the two paths of scattering light interference signals; common-mode components are filtered out, and beat frequency electric signals are obtained. After passing through an envelope detection circuit consisting of full-wave rectification and low-pass filtering, the beat frequency electric signals are moved to a baseband from a carrier in a frequency domain, so that therequirement of the system on the sampling rate of an acquisition card is reduced; the envelope of the beat frequency electric signals is obtained in the time domain; digital demodulation in coherentdetection is avoided, and the burden of a processing device is reduced. The full-wave rectification circuit and coherent detection are combined, and the sensing distance is increased while the high signal-to-noise ratio of coherent detection is ensured.

The invention relates to fibrous protein targeted multi-modal nano particles for micro-thrombus detection and application thereof. The multi-modal nano particles comprise a magnetic resonance probe, a near-infrared fluorescent probe, fluorescent dye, a surface modification molecule and a fibrous protein targeted molecule, wherein the magnetic resonance probe refers to superparamagnetic ferroferric oxide nano particles; the near-infrared fluorescent probe is IR783; the fluorescent dye is rhodamine; the surface modification molecule is polyethylene glycol; and the fibrous protein targeted molecule is homing peptide. According to the multi-modal nano particles, the magnetic resonance probe and the near-infrared fluorescent probe are combined with each other, multi-modal synchronous noninvasive detection of thrombus can be realized, the detected space resolution and sensitivity are guaranteed, the high-density CREKA is distributed on the nano particles, and the specificity and sensitivity are further guaranteed. Therefore, the nano particles are particularly suitable for micro-thrombus detection with small size and disperse distribution, the fluorescent dye is connected to the nano particles, so that in-vitro detection is conveniently realized.

The invention relates to an unilateral air coupling ultrasonic scanning imaging device and method, the device is used for internal defect detection of an object, the device includes a probe scanning frame, a pair of planar transmitting probes and a pair of focusing receiving probes, a preamplifier, a pulse transmitting receiver, a signal acquisition and processing module and a computer, the pair of planar transmitting probes and the pair of focusing receiving probes are arranged on the same side of the probe scanning frame, the pulse transmitting receiver is connected with the pair of planar transmitting probes, the pulse transmitting receiver is connected with the pair of focusing receiving probes by the preamplifier, and also is connected with the computer by the signal acquisition and processing module, and the probe scanning frame is respectively connected with the computer, the pulse transmitting receiver and the signal acquisition and processing module. Compared with the prior art, , the unilateral air coupling ultrasonic scanning imaging device has the advantages of being easy to focus, high in emission efficiency, high in identification and the like.

The invention discloses a method for removing a ring artifact in a CT image. The method comprises the following steps: in a rectangular coordinate domain, performing extension an original reconstruction image having the ring artifact to generate a first reconstruction image, the image construction center of the first reconstruction image being overlapped with the rotation center of a rack; converting the first reconstruction image into a second reconstruction image in a polar coordinate domain; in the polar coordinate domain, utilizing frequency domain filtering to process a second ring image extracted from the second reconstruction image; converting the second ring image into a third ring image in the rectangular coordinate domain; performing inverse extension on the third ring image to obtain a fourth ring image, of which the size is the same with that of the original reconstruction image; and removing the fourth ring image from the original reconstruction image having the ring artifact to obtain a ringless image in the rectangular coordinate domain. For any image construction center, the ring artifact can be removed by utilizing the method in the invention.

The invention provides an array pressure sensor and pressure acquisition system for plantar pressure acquisition. The array pressure sensor and the pressure acquisition system are characterized in that the common row pressure sensing points of the array pressure sensor share the row lead wire, and the common column pressure sensing points share one column lead wire, and double surface wiring are performed on the row wire and the column wire, so as to enable the array pressure sensor to reduce the number and the wiring density of wire leads and reduce the design difficulty of the large-size array pressure sensor, thereby satisfying the increase of the pressure sensing area while ensuring the spatial resolution and sampling rate of the sampling. The invention also discloses a pressure acquisition system which is designed based on the array pressure sensor. The pressure acquisition system performs sampling on the array pressure sensor by means of the row sharing, column sharing and time sharing sampling method, so as to realize acquisition of the plantar pressure data in the natural walking state and guarantee accuracy and stability of the pressure acquisition system.

The invention relates to a precision assembly method of an eight-channel Kirkpatrick-Baez microscope. The precision assembly method is characterized in that every two reflective mirrors which are reversely and symmetrically arranged form a mirror pair, each mirror pair is respectively designed with particular mirror distance and mirror included angle, the positions of optimum view fields of channels are coincided, and an image point interval meets the microstrip interval of a multi-frame camera; after X-ray imaging experiment, the position coinciding of the optimum view fields is realized, and each image point is controlled within the microstrip range of the multi-frame camera; finally, the three pairs of adjusted reflective mirrors are bonded and cured into one set of eight-channel KB lens. Compared with the prior art, the precision assembly method has the advantages that the stricter requirement on optical components in the assembly process of the existing multi-channel KB lens is avoided, the problem of error causing in the existing indirect assembly type is solved, and the final assembly accuracy is high.

The invention discloses a particle speed distribution measurement system of an ion thruster plume area. The system comprises an optical signal generation and transmission unit, an optical signal detection unit and a data acquisition and control unit. The optical signal generation and transmission unit is arranged outside a vacuum chamber, and used for generating laser and splitting the laser into four beams through a beam splitter, wherein three beams enter a wavelength meter, a power meter and an F-P interferometer respectively and the other beam enters the vacuum chamber through a chopper and a fiber and used for motivating to-be-measured particles. An axial or radial laser incidence device in the optical signal detection unit receives laser beams entering the vacuum chamber, and is used for carrying out focusing calibration on the laser beams and motivating particles of a detection area. A fluorescence detection device is used for acquiring fluorescence emitted through motivation of the particles at a detection point, and sending fluorescent signals to the data acquisition and control unit which processes the fluorescent signals.

The invention discloses a multi-band high-resolution tomographic imaging device for solar atmosphere based on an adaptive optical system. The multi-band high-resolution tomographic imaging device for the solar atmosphere based on the adaptive optical system is mainly composed of a collimating mirror, a wave front corrector, a shrinkage beam system, a dichroic beam splitter, a shack-hartmann wave front sensor, a fine tracking wave front sensor, a wave front controller, a blue light imaging channel, a red light imaging channel, a near infrared imaging channel and a data storage system. Different bands of sunlight are corresponding to different heights of the solar atmosphere. The multi-band high-resolution tomographic imaging device for the solar atmosphere based on the adaptive optical system realizes the high-resolution tomographic imaging of the solar atmosphere through simultaneously imaging multiple bands of sunlight and using the adaptive optical system to eliminate the influence of atmosphere turbulence on ground-based telescope imaging. The multi-band high-resolution tomographic imaging device for the solar atmosphere based on the adaptive optical system uses the adaptive optical system to guarantee the space definition of images, multiple bands of sunlight enter different imaging channels successively according to the wavelength, and the energy utilization of each imaging channel is improved. The multi-band high-resolution tomographic imaging device for the solar atmosphere based on the adaptive optical system has an important application prospect in the sun observation field and is significant for the solar physics research.

The embodiment of the invention relates to terminal equipment. The terminal equipment comprises a display screen and a processing circuit. The display screen comprises an ultrasonic guided wave transducer array, and the ultrasonic guided wave transducer array comprises at least one ultrasonic guided wave transducer. The at least one ultrasonic guided wave transducer can excite a Quasi-Rayleigh modal ultrasonic guided wave signal. The working frequency thickness product of the ultrasonic guided wave transducer is within the range of 5MHz. mm to 15MHz. mm. The at least one ultrasonic guided wavetransducer is used for transmitting an ultrasonic guided wave sound field signal. The processing circuit receives the scattered sound field signal, obtains a first fingerprint image according to thescattered sound field signal, and compares the first fingerprint image with a pre-stored second fingerprint image. When the first fingerprint image is matched with the second fingerprint image, an application operation is executed. The terminal excites an ultrasonic guided wave sound field with good characteristics and single mode on the display screen cover plate glass, weakens the influence of frequency dispersion characteristics of the sound field, eliminates coherent interference caused by multi-mode characteristics, improves the signal-to-noise ratio of a detection signal, and ensures thespatial resolution and contrast resolution of fingerprint imaging.

A CT device and a CT imaging method thereof. The CT device comprises: an annular electron gun array (7) that comprises multiple electron guns, wherein each electron gun is configured to emit an electron beam sequentially along a radial direction of the annular electron gun array (7) according to a predetermined pulse sequence; an accelerating cavity (8), which is arranged at an annular inner side of the annular electron gun array (7), comprises multiple concentric coaxial cavities that are embedded together, works in π mode and is used for sequentially accelerating the electron beam emitted by each electron gun of the annular electron gun array (7); an annular transmission target (9), which is arranged at an annular inner side of the accelerating cavity (8), and bombarded by the accelerated electron beam to generate an X-ray; and an annular detector (11), which receives the X-ray that penetrates an examined object.

The embodiment of the invention discloses a functional magnetic resonance imaging method, device and system as well as equipment and a storage medium. The method comprises the steps as follows: controlling the magnetic resonance scanning of a target region of an examinee based on a preset balanced steady-state free precession sequence; acquiring a plurality of magnetic resonance fingerprint data of the target region, and determining at least one tissue feature including T2* and corresponding to the magnetic resonance fingerprint data based on the magnetic resonance fingerprint data and a pre-constructed signal dictionary; and generating a magnetic resonance image based on the at least one tissue feature including T2*. According to the method provided by the embodiment of the invention, magnetic resonance fingerprint imaging and balanced steady-state free precession imaging are combined, so that a higher image signal-to-noise ratio and a deformation-free image are provided.

The invention discloses a panel PET and optical dual-mode fusion imaging system and method based on breast cancer detection. The system comprises a signal acquisition subsystem and a computer subsystem, wherein the signal acquisition subsystem comprises a panel PET imaging device and an optical imaging device, and is used for obtaining PET data and optical data; the computer subsystem comprises asystem control module, a data processing module, a data reconstruction module and a data registration module; the data processing module can preprocess the PET data and optical data; the data reconstruction module can reconstruct the preprocessed PET data and optical data respectively to obtain reconstructed images; the data registration module is used for performing registration and fusion on thetwo reconstructed images, so as to realize accurate positioning of breast cancer. The system can perform PET imaging and optical imaging at the same time on a breast, and provides a powerful image technology support for the early accurate diagnosis and prognosis therapeutic evaluation of breast cancer.

The invention discloses a chlorophyll a concentration inversion method and system, and the method comprises the steps: obtaining the data of a high-resolution No.6 full-color multispectral camera anda wide-width camera which transit at the same time, carrying out the preprocessing, and obtaining a remote sensing reflectivity image; performing equivalent resampling on the actually measured water body spectrum to obtain a spectrum range the same as that of the remote sensing reflectivity image to obtain an equivalent actually measured water body spectrum, and establishing a chlorophyll a concentration inversion initial model with the actually measured chlorophyll a concentration; optimizing the chlorophyll a concentration inversion initial model based on the remote sensing reflectivity image to obtain a chlorophyll a concentration inversion model; and inputting the remote sensing reflectivity image into a chlorophyll a concentration inversion model to obtain the chlorophyll a concentration. Compared with other high-resolution images, the fused Gaofen-6 data can monitor the water quality in a single scene and a large range, has a red-edge wave band highly related to the chlorophyll aconcentration, and has higher precision for inversion of the chlorophyll a concentration.

The invention provides a thermal diaphragm suitable for an annular solar telescope. One end of the thermal diaphragm suitable for the annular solar telescope toward the direction of light incidence isa reflective surface, and the other end is a bottom surface; the reflective surface of the thermal diaphragm suitable for the annular solar telescope is an inverted cone shape, and the bottom surfaceis a positive cone shape; the reflective surface with the inverted cone shape and the bottom surface with the positive cone shape are tangent at the vertexes of the two cones to form a light passinghole; and the cone angle of the inverted cone of the reflective surface is 88 to 93 degrees. The thermal diaphragm structure design provided by the invention strengthens the thermal control ability near the light passing hole, optimizes the temperature field near the light passing hole, reduces stray light to the greatest extent, and suppresses a ghost image; and the thermal diaphragm suitable forthe annular solar telescope has good temperature control effect, no ghost image and good stray light suppression effect, which ensures the imaging quality of the telescope.

The invention provides a substation foreign matter identification and detection method, device and system, and relates to the technical field of target detection, and the method is executed through an improved target detector. The improved target detector comprises a backbone network, a feature fusion network and a classification identification network which are connected in sequence; the method comprises the steps of obtaining a to-be-detected image for a transformer substation; performing feature extraction on the to-be-detected image through the backbone network of the target detector to obtain a feature map of the to-be-detected image, wherein the backbone network comprises a first preset number of dilated convolution residual error sub-networks which are connected in sequence; performing feature fusion on the feature map of the to-be-detected image based on a feature fusion network to obtain fused feature information; and performing target detection on the fusion feature information based on a classification identification network so as to identify and detect the foreign matters of the transformer substation. According to the invention, the accuracy and robustness of foreign matter identification of the target detector in the transformer substation are improved.

The invention provides a small target semantic segmentation method and system based on a low-rank mixed attention mechanism, and the method comprises the steps: constructing a segmentation model, specifically, constructing a segmentation data set, and carrying out the data preprocessing; performing feature extraction on the preprocessed segmented data set: expanding a receptive field based on expansion convolution; as the substitution of a pooling layer, adding a low-rank mixed attention mechanism in the network to aggregate feature information and extract high-order semantic features; for the extracted features, calculating weighted cross entropy loss and Dice loss, and training the network by using a mixed loss function to obtain a network model; and for the to-be-segmented object, outputting a small target segmentation result by using the segmentation model. The method effectively solves the problem that a relatively small target size in an image data set is easy to cause serious class imbalance, and the problem that accurate reconstruction of an image is difficult to realize in a decoder due to information loss in a feature learning process.

The invention relates to a spectral imaging technology, and in particular relates to a spectral imaging system and method based on a diffraction lens / zoom lens array, and aims at solving the problemsthat an existing spectrograph is complex in structure, high in manufacturing cost and poor in spatial resolution of a formed image. According to the technical scheme, the spectral imaging system basedon the diffraction lens / zoom lens array comprises the diffraction lens array, the zoom lens array, a photoelectric detector array, a control unit and a data processing unit. The diffraction lens array, the zoom lens array and the photoelectric detector array are sequentially arranged on the same optical path, the optical path comprises N wavelength spectrum bands, and N is greater than or equal to 2; the control unit is electrically connected with the zoom lens array, the control unit is used for adjusting the focal length of the zoom lens array, and the data processing unit is electrically connected with the photoelectric detector array; the invention further provides a method of the spectral imaging system based on the diffraction lens / zoom lens array.

The invention provides a ceramic shell for a laser detector, the laser detector and a preparation method of the ceramic shell, and belongs to the technical field of ceramic packaging. The ceramic shell comprises a ceramic base and a flange plate, and the ceramic base is provided with a packaging cavity; the flange plate is arranged on the ceramic base, and the outer edge of the flange plate protrudes out of the outer edge of the ceramic base; and the protruding outer edge of the flange plate is provided with a connecting part used for installation and fixation. According to the ceramic shell for the laser detector provided by the invention, the size of the flange plate is increased, and the connecting part used for fixed installation after packaging is arranged on the outer edge of the flange plate, so that the packaged device can be conveniently installed on a loading platform, and the requirement on the loading platform is reduced. According to the invention, the matching problem of the large-size metal component and the ceramic and the problems of residual stress and welding deformation compensation after high-temperature welding can be solved, good matching of the large-size metal component and the ceramic of a large cavity is achieved, the spatial resolution of a device and the imaging effect of an imaging system are guaranteed, and the reliability of signal transmission is improved.

The invention relates to a flat-plate real-time image-forming gas detector based on FET switch array, which belongs to the radiation imaging field. The detector comprises a closed air chamber (1), a drift electrode (2), a GEM film (3), a FET switch array (12), a data-acquisition system (8) and the like, wherein the drift electrode (2) and the GEM film (3) are both arranged in the closed air chamber (1), negative high pressure is applied on the upper surfaces and the lower surfaces of the drift electrode (2) and the GEM film (3) through a high-pressure divider resistance string (7) in turn, and the electric potential difference between the upper surface and the lower surface of a single-layer GEM film is 300-400v. Rays are ionized by a drift region, electrons which are generated are magnified through GEM avalanche and are gathered by a readout electrode pad array (5), and the FET array (12) is controlled to select and sequentially read out to the data-acquisition system (8), and is transmitted to a data processing and displaying computer (9). The flat-plate real-time image-forming gas detector utilizes the FET switch array to achieve real-time image, which greatly reduces the number of electronic channels which are needed, and lowers the production cost.

The invention discloses CT (computed tomography) equipment and a usage method thereof. The CT equipment comprises an electron beam generating device, an annular reflection target and an annular detector array, wherein the electron beam generating device comprises an electron gun, deflection scanning devices and a current-limiting device; the electron gun generates electron beams; the deflection scanning devices deflect the electron beams, and the deflection directions are changed along with time to realize annular scanning; the current-limiting device is provided with a plurality of holes arranged annularly; when the electron beams carry out scanning along the holes arranged annularly, a plurality of electron beams distributed annularly are output; the annular reflection target and the annularly-distributed electron beams are coaxially arranged; the electron beams bombard the annular reflection target to generate X rays intersecting with the axes of the electron beams distributed annularly; the annular detector array is coaxially arranged with the annular reflection target and comprises a plurality of detector units; and the X rays enter the corresponding detector units after penetrating through a detected object.