42results about How to "Low detection efficiency" patented technology

The invention discloses LED (Light Emitting Diode) ageing detection screening equipment and method. In the equipment, a push rod is driven by a power device to make each splint press towards a corresponding LED row and a corresponding LED cathode pin is in contact with a corresponding cathode contact, so that electrification of LEDs is realized; meanwhile, detection screening of the LEDs is realized by using a PC (Personal Computer) machine. In the entire ageing process, rated voltage output by a circuit control system is kept at 24V, the rated current output is 50mA, current and voltage input to the LEDs are adjustable, and the rated current and rated voltage are supplied to the ageing of the LEDs for 20-60 minutes; through ageing, LEDs with electrical and process hidden troubles can be eliminated; and after ageing, the power device stops acting on the push rod and each splint returns to an initial position under the action of the acting force of a return spring, so that detection ofLEDs is realized and defective LEDs are eliminated.

A method and apparatus for identifying a concrete crack includes: obtaining a crack video, and manually annotating a video image frame by using a label; predicting a future frame and label for the annotated frame by using a spatial displacement convolutional block, propagating the future frame and label, to obtain a synthetic sample, and preprocessing the synthetic sample, to form a crack database; modifying input and output ports of data of a deep learning model for video semantic image segmentation and a parameter, to enable the deep learning model to accept video input, and establishing a concrete crack detection model based on the video output; using a convolutional layer in a trained deep learning model as an initial weight of the concrete crack detection model for migration; inputting the crack database into a migrated concrete crack detection model, and training the concrete crack detection model for crack data.

An image processing method and apparatus, and a storage medium are provided. The method includes: detecting a target object in a current video frame of a target video stream, to obtain a current detection region for the target object; adjusting the current detection region according to a historic detection region corresponding to the target object in a historic video frame of the target video stream, to obtain a determined current detection region; performing key point positioning on the target object based on the determined current detection region, to obtain a first set of key points; and performing stabilization on locations of the key points in the first set according to locations of key points in a second set corresponding to the target object in the historic video frame, to obtain current locations of a set of key points of the target object in the current video frame.

The invention discloses a novel dual-energy X-ray imaging detector. The novel dual-energy X-ray imaging detector comprises a composite flicker body, wherein the composite flicker body is composed of two different sheet flicker bodies. One kind of flicker body is used for absorbing high-energy X-rays in a dual-energy X-ray and producing flickering light. The other kind of flicker body is used for absorbing low-energy X-rays in the dual-energy X-ray and producing flickering light. An optical module is located between the composite flicker body and an imaging sensor. The flicker light produced by the composite flicker body is enabled to form an image on the imaging sensor. The imaging sensor is used for detecting optical field distribution of the image formed on the light-sensitive surface of the imaging sensor and converting the image into a digital image. Three-dimensional spatial distribution information of flicker lighting points is obtained after arithmetic processing is carried out on the digital image. According to the novel dual-energy X-ray imaging detector, image formation of flicker light produced in a flicker body of a continuous structure is available, and the problems that high system complexity and low detection efficiency and the like caused by an independent flicker body array structure are solved.

The invention discloses a method for quickly grading terrene surrounding rock in real time on the basis of while-drilling parameters. The relational expression between a clay soil liquidity index and the while-drilling parameters, the relational expression between the sandy soil standard penetration hammering number and the while-drilling parameters and the relational expression between the gravel soil dynamic sounding hammering number and while-drilling parameters can be established, in actual underground engineering, the soil variety of a terrene tunnel is firstly judged, drilling detection is conducted, the obtained while-drilling parameters are substituted into the relational expressions to obtain the liquidity index I<L> of clay soil surrounding rock, the standard penetration hammering number N of sandy soil surrounding rock and the dynamic sounding hammering number N<63.5> of gravel soil surrounding rock, and then quick and real-time grading is conducted on the surrounding rock in front of a tunnel face according to the Guidelines for Design of Highway Tunnel. According to the method for quickly grading the terrene surrounding rock in real time on the basis of the while-drilling parameters, only drilling testing needs to be conducted on the surrounding rock through a drilling machine at an engineering site, other tedious indoor tests or site tests are not needed, quick and real-time grading is conducted on the terrene surrounding rock, the grading efficiency is high, and operation is easy.

The invention provides a neutron energy spectrum measuring device and a Bonner sphere spectrometer system. A diamond detector is adopted as a thermal neutron counter, the advantage that the diamond detector is low in thermal neutron detection efficiency and quick in response is utilized, data real-time recording can be realized, the problem of detector counting saturation in a strong neutron fieldis avoided, and the device has the advantages of a real-time data recording function that existing active Bonner sphere spectrometers have and an anti-saturation function in a high-throughput neutronfield. A gap is formed between a diamond sensitive unit and a 6LiF neutron converter, so that alpha and tritium particles obtained by thermal neutrons and 6Li reaction can be separated, and tritium particle counting is more accurate. In addition, only one diamond detector is arranged in each spherical moderator, so that electronics and a data collection system are enabled to become simple and bemore convenient for operation, and subsequent data processing is made simple and convenient.

A method and apparatus for detecting a multimedia content change, and a resource propagation system. The method comprises: when importing a resource address of multimedia content, acquiring original feature information of the multimedia content; receiving first feature information of the multimedia content from a client; determining, according to the first feature information and corresponding original feature information of the multimedia content, whether the resource address of the multimedia content is abnormal; and detecting whether multimedia content at an abnormal resource address is changed. It is firstly determined whether a resource address corresponding to multimedia content is abnormal, and if the resource address is abnormal, then it is determined whether the multimedia content corresponding to the resource address is changed, thereby preventing repeated checking of a large number of normal resource addresses, improving the detection efficiency, and reducing the detection cost.

The present invention provides a color filter substrate, a display device and a detection method thereof, aims to solve the problems of difficulty in failure positioning and low detection efficiency in existing display panels. The color filter substrate comprises a plurality of sub-pixels arranged in an array, each of the sub-pixels is provided with a color filter, and at least a part of columns of sub-pixels are marked column of sub-pixels. The shapes of the color filters of a part of sub-pixels of the marked column of sub-pixels are different from those of the remaining sub-pixels. The display device comprises the above-mentioned color filter substrate. The color filter substrate can be used in the display device, particularly suitable for the display device which adopts double side GOA circuits.

A radiation residue scanning device includes a plurality of CZT detectors, a plurality of data processing units, a plurality of window acquisition circuits, a plurality of counting units, and a processor; the plurality of CZT detectors connected in one-to-one correspondence to the plurality of data processing units; the plurality of data processing units are connected in one-to-one correspondence to the plurality of window acquisition circuits; and the plurality of window acquisition circuits are connected in one-to-one correspondence to the counting units The window acquisition circuit includes a plurality of acquisition modules, and the respective acquisition modules are connected in parallel; the counting unit includes a plurality of counting subunits, the counting subunits are connected in one-to-one correspondence to the acquisition window modules, and the processor is connected to the plurality of counting units.

The invention relates to a CMOS SPAD (Single Photon Avalanche Diode) photoelectric device with a deep N well adopting inverse doping distribution, which comprises a P substrate, wherein the P substrate is provided with a deep N well, a central N well and a P+ layer, two sides of the deep N well are provided with N wells, the deep N well adopts an inverse doping distribution structure, that is, thedeep N well close to the device surface is low in concentration and the concentration of the deep N well increases along the increase in vertical depth away from the device surface, the transverse diffusion exists between the two lateral N wells and the central N well in the deep N well, an n- virtual protection ring is formed at the edge of a PN junction, incident photons are mainly absorbed bythe deep N well when shooting to the internal part of the device, most of the photons can be utilized by the P+ layer/central N well junction to form photon-generated carriers, and only a few of the photons penetrate through the deep N well and form photon-generated carriers on the P substrate. The photon detection efficiency of the device is improved by mainly increasing the thickness of an absorption region of the device and optimizing the quantum efficiency of the device.

The invention relates to a CMOS SPAD photoelectric device with a deep N well in reverse doping distribution. The CMOS SPAD photoelectric device comprises a P substrate, the deep N well, a central N well and a P + layer are arranged on the P substrate, N wells are arranged at the two sides of the deep N well, the deep N well is of a reverse doping distribution structure, namely, the concentration of the deep N well close to the surface of the device is low, and the concentration of the deep N well is higher with the longitudinal depth away from the surface of the device is increased, transverse diffusion exists between the N wells at the two sides in the deep N well and the central N well, an n-virtual protection ring is formed at the edge of the PN junction, when incident photons are emitted into the device and are mainly absorbed by the deep N well, most photons can be utilized by the P + layer/central N well junction to form photon-generated carriers, and only a small number of photons penetrate through the deep N well to form a photon-generated carrier on the P substrate. The photon detection efficiency of the device is improved mainly from two aspects of increasing the thickness of the absorption region of the device and optimizing the quantum efficiency of the device.

The invention discloses a signal detection method and device for a continuous variable quantum key distribution system. The method comprises the following steps: splitting received quantum light into first split light and second split light; combining the first split light and the second split light to generate first combined light; calibrating the polarization of the first combined beam according to a preset polarization value; splitting the first combined beam into first detection light and second detection light; modulating the phase of the local oscillation light according to a preset phase value; splitting the local oscillation light into third detection light and fourth detection light which are polarized and orthogonal; carrying out the homodyne detection on the first detection light and the third detection light, carrying out the homodyne detection on the second detection light and the fourth detection light, and obtaining a detection result; and obtaining the quantum state of the quantum light according to the detection result. According to the invention, because the strong light of the local local oscillation light is introduced, even if the transmission process is too long and the reference light is attenuated, the local local oscillation light can also complement the reference light, so that the detection efficiency of a receiver is prevented from being reduced, and the code rate of the system is further improved.

The invention discloses an access control detection system and a detection method using an energy spectrum recognition algorithm. According to the detection method, when a plastic scintillator is long, an optical path of photons generated by incident ions far away from a light collection point to the collection point is long, the attenuation of light signals is severe, the light collection efficiency is reduced, and the detection efficiency is reduced. The access control detection system is composed of a plastic scintillator, wherein two ends of the plastic scintillator are connected with photomultipliers respectively; the two ends of the plastic scintillator are electrically connected with a signal acquisition system for signal acquisition; two paths of single-channel analyzers of the signal acquisition system are connected by means of a coincidence counter and are used for measuring two paths of coincidence counts; and output ends of the single-channel analyzers of the signal acquisition system are connected by means of a summing counter and used for summing the two paths of signals. The detection method is used for detecting iodine-125 particles in access control.

The invention discloses a time domain stacking surface wave detection method based on pseudo random signals. The method comprises the steps of: the step 1, obtaining pseudo random signals, wherein theobtained pseudo random signals must have the directionality and are in full spectrum band distribution or in a spectrum band range of 1Hz-1000Hz, and the mode of obtaining the pseudo random signals is that vehicle vibration noise, vibration noise of a river with a flow speed larger than 2m/s or vibration noise loaded by manual operation; the step 2, performing t-p transform of the obtained pseudorandom signals to obtain time-speed domain signals; and the step 3, performing overlapping of the obtained time-speed domain signals in the time-speed domain, namely performing Fourier transform onceat the time domain to transform the time domain to a frequency domain to obtain frequency-speed domain signals. The time domain stacking surface wave detection method has the advantages of high detection precision and good consistency, at the same point, the speeds obtained by testing at different times have an error of less than 10%, the precision is very high, and therefore the time domain stacking surface wave detection method can be used as an effective testing method for testing.

The present invention provides a category of cyano-substituted asymmetric cyanine dyes having the following general structural Formula I and its synthesizing method. The cyano-substituted asymmetric cyanine dyes in present invention are easily synthesized and have long emission wavelength, high molar extinction coefficient, high sensitivity, good light stability, high fluorescence quantum yield after binding with nucleic acid, and low cell toxicity, which is beneficial for application as fluorescent dyes and could also be used in the field of identifying nucleic acid molecules, clinical diagnostics, and immunoassay testing etc.

Nonuniformities in the efficiency of detection of individual fluorescing reaction mixtures in a well plate with a two-dimensional array well array are corrected. The nonuniformities arise both from the stimulation pattern and the detection pattern, and are corrected by adding additional segments to a pair of segmented mirrors. The additional segments are oriented to direct light to the outermost reaches (i.e., the four corners) of the array and thereby produce a stimulation pattern that has a greater intensity in the outermost regions. This compensates for a radial decline in the efficiency of the detector in detecting the emissions from the well plate, the radial decline being an artifact of systems that utilize CCDs or similar components as detectors.