985 results about "Darkroom" patented technology

The invention discloses an automatic LCD screen detecting cabinet based on machine vision. The automatic LCD screen detecting cabinet based on machine vision comprises a cabinet base, a darkroom, a multi-station rotating plate system, an automatic machine vision adjusting system and an automatic PG screen pointing system. The automatic PG screen pointing system comprises a graph signal generator, a pneumoelectric sliding ring, a power source, a computer and a plurality of signal rotating plates corresponding to LCD screen jigs in number. The automatic machine vision adjusting system comprises an industrial camera, a camera installation assembly, a perpendicular movement mechanical arm and a mechanical arm support. A light source support is further arranged on the top of the cabinet base, and a light source is arranged on the light source support and located between the industrial camera and the LCD screen jigs. The signal output end of the industrial camera is connected into the computer, and the control end of the perpendicular movement mechanical arm and the control end of the motor are connected into the computer. The automatic LCD screen detecting cabinet can eliminate the influences of external natural light and dust and impurities in the air on LCD screen defect detection, and meanwhile, the detecting cabinet has high integration degree, and the detecting efficiency of an LCD screen is greatly improved.

The present invention discloses a method and an apparatus for testing (TIS) in a multi-antenna (MIMO) system. The apparatus includes a base station simulator, a multipath fading channel simulator and a darkroom including a measuring antenna and a device under test placed in the darkroom. During the testing, the base station simulator generates transmitting signals of multiple transmitting antennas, and the transmitting signals have characteristic of orthogonal polarization and adopt STBC or SFBC; the multipath fading channel simulator adds corresponding channel parameters and noise interference parameters to the transmitting signals, and transmits the transmitting signals which have been decayed to the measuring antenna in the darkroom to send the transmitting signals which have been decayed to the device under test; the device under test performs multi-antenna receiving on the transmitting signals, performs MRC on received signals, and acquires the (TIS) according to the received signals which have been combined.

The invention provides a digital beam forming and phase fitting method, and aims to provide a method capable of suppressing interference, improving the signal to interference and noise ratio and accurately controlling the phase of a beam forming signal. The method is implemented according to the technical scheme that a steering vector model obtains relative steering vectors by using online calibration, accurate absolute steering vectors are acquired by combining absolute phase responses, which are measured in a darkroom, of a reference array element, model parameters of the steering vector are fitted out by combining the existing absolute steering vectors, and an accurate spare steering vector of an antenna array in any direction is acquired; the second-order statistic of the array signal is iteratively calculated through an array signal statistic hardware calculation module, and sent to an array signal processing algorithm module together with an antenna array steering vector and a channel response to calculate an optimal beam weight; and finally, the array signal processing algorithm module imbeds the optimal beam weight into the digital beam forming module to perform real-time digital beam forming and phase fitting and process multi-channel array data and beam output in real time.

The invention provides a quick testing method for the radiation characteristic of an array antenna. In a non-darkroom environment, a transceiver is used for emitting a signal to the antenna to be tested, a probe moving according to a track is used for receiving the signal and transmitting the signal back to the transceiver, a main control computer is used for calculating an output port surface near field value, a directional diagram of the array antenna to be tested is synthesized according to the output port surface near field value, and then a parameter value of the radiation characteristic of the array antenna is obtained. The method has no special requirement for the testing environment and is not limited by site size, weather and the like, a strict shield chamber is not needed, testing can be carried out in the production environment or the research and development environment of the antenna, testing speed and efficiency are high, the testing devices occupy a small area, testing can be carried out anytime conveniently and rapidly, the testing result is comprehensive and accurate, and the method is particularly suitable for quick detection of antenna products on a production line and being used for primary detection of the antenna during product research and development.

The invention relates to a self-cleaning microwave absorption paint and uses thereof. According to the invention, a urethane foam pyramidal material is coated with a layer of paint to form a micron-nano composite structure layer which has an angle of contact larger than 150 degrees and an angle of roll smaller than 5 degrees. The paint consists of a nano material, a micrometer material, a coupling agent, bonding resin, a base material, a curing agent, an auxiliary and an organic solvent. By means of the microwave absorption paint provided by the invention under a fireproof spraying mode, water beads can roll off a pyramidal surface rapidly with ashes contained in the water beads, thus achieving the effect of self cleaning, reducing the ashes in a microwave darkroom and accordingly meeting the special requirement of a cleaning-type dark room on maintaining high long-term cleanness. The self-cleaning microwave absorption paint provides a new way for implementing the cleaning-type dark room.

The invention provides a system for testing the aerial performance of a wireless USB modem and comprises a darkroom, a rotating floor that is arranged in the darkroom, a testing antenna and a computer, wherein, the wireless USB modem is connected with the started computer through a USB wire, and the computer is fixed in the top end of a rotating shaft that is vertical to a plane of the rotating floor; the USB modem is arranged in a proper position of the darkroom for implementing the great circle test of the USB modem. The invention further provides a method for testing the aerial performance of the wireless USB modem. Therefore, the invention can better utilize an OTA testing darkroom of existing cellphones, the hardware system of the rotating floor and the software system, and a three-dimensional directivity diagram and TRP and TIS data which are acquired from the testing can reflect the radiation and receiving characteristics of the antenna.

The invention relates to a power grid equipment detecting technology, in particular to an X-ray radiographic digital imaging detection method for power grid GIS (Geographic Information System) equipment. The detection method comprises the following steps of: (1) fixing a part needing to be shot; (2) erecting an X-ray apparatus and placing an X-ray sensitization imaging plate; (3) connecting a cable between the X-ray apparatus and a console; (4) connecting a CR (Conditioned Reflex) digital image scanner and a computer by a special data line; (5) setting a shooting parameter of the X-ray apparatus according to the field condition; (6) starting a high-voltage emitting button of the console and carrying out radiographic shooting; (7) reading data to obtain a digital image picture; and (8) processing a shooting result by the computer. An X-ray radiographic digital imaging system of the GIS equipment directly reads data of an IP (Internet Protocol) imaging plate by adopting an advanced CR digital image scanning technology and converts the sensitizing image information on the IP imaging plate into a digital image signal; and compared with the traditional ray film needing a darkroom and the step of developing, the working efficiency is greatly improved.

Plane coat technique includes following steps: (1) preparing organic colloid; (2) preparing solution of photosensitizer; (3) mixing organic colloid with photosensitizer according to proportion, adding a small quantity of dispersant or defoaming agent dispersed to organic colloid evenly to form sensitization system accorded with requirement; (4) preparing suspension of sensitization colloid of containing phosphor powder; mixing phosphor powder with sensitization liquid prepared in step (3) according to proportion, mixing them evenly so as to prepare slurry of phosphor powder; (5) coating the slurry obtained in step (4) on surface of LED chip so as to form coat layer of phosphor powder; dry in the shade or air-dry in darkroom; (6) exposure and develop obtains layer of phosphor powder with plane structure; (7) solidifying layer of phosphor powder with plane structure obtained in step (6) to make physicochemical characteristics stable.

The invention provides a test method for the performance parameter of an active antenna. According to the characteristic that an uplink and a downlink of the active antenna can not be reciprocal, in the invention, different platforms are designed for respectively testing the uplink and the downlink so as to accurately measure the uplink and the downlink antenna directional diagrams and the gain of the active antenna. The test method for the uplink and the downlink directional diagrams and the gain of the active antenna is a novel test method, which is provided for the active antenna and developed on the basis of a traditional passive antenna. Because no effective measuring method is designed for the uplink and the downlink directional diagrams and the gain of the active antenna at present, the method in the invention can be used for accurately measuring the uplink and the downlink directional diagrams and the gain of various active antennas through the matched design of related parts at the far end, the inner part and the near end of a microwave darkroom and the real-time record control of a control computer, thereby favorably promoting the development of the active antenna.

The embodiment of the invention provides a double-darkroom structure for an MIMO OTA test and a test method. The double-darkroom structure comprises a first darkroom, a second darkroom, a third darkroom and a fourth darkroom, wherein the first darkroom comprises a first tested device and a first group of probes which are respectively arranged in the first darkroom according to a real environment simulated by a first tested device, are arranged in a non-contact manner and transmit a first signal in a radiation manner. The second darkroom comprises a second tested device and a second group of probes which are respectively arranged in the second darkroom according to a real environment simulated by the second tested device, are arranged in a non-contact manner and transmit a second signal ina radiation manner. The channel simulator comprises a channel port on one side and is connected with the first group of probes through a first radio frequency wire penetrating through the first darkroom, and the channel port on the other side and contained in the channel simulator is connected with the second group of probes through a second radio frequency wire penetrating through the second darkroom.

The invention discloses an independent photoelectric smoke detection alarm which comprises an alarm base, an alarm upper cover and a circuit board. The alarm upper cover covers the alarm base to form a photoelectric darkroom, and only smoke and less light are allowed to enter the photoelectric darkroom. A space is surrounded by a lower recessed cavity in the alarm base and an upper recessed cavity in the alarm upper cover to form the photoelectric darkroom. The circuit board is arranged in the lower recessed cavity. A signal processing module, an infrared transceiver module and a wireless communication module are integrated on the circuit board. The infrared transceiver module comprises an infrared light emitting diode and an infrared receiving diode. A voice alarm module and a display module are built in the alarm upper cover. A test button is arranged on the alarm upper cover. A power supply module is arranged in the alarm base. The independent photoelectric smoke detection alarm provided by the invention has the advantages of strong anti-interference ability, sensitive detection, simple structure, reasonable design, accurate detection and long service life. A 3-volt lithium manganese battery with the service life of 10 years is built in the independent photoelectric smoke detection alarm.

The invention relates to a full electric wave darkroom possessing both aerial radio frequency testing and EMC testing abilities, belonging to the technical field of aerial radio frequency testing darkroom and full electric wave darkroom design for radio equipment. And it comprises shielding casing, wave absorption material layer bonded with inner wall of the casing, false wall, darkroom door, turntable and tested equipment supporting device installed in the casing, antenna bracket system, vent illuminating device, filter, safe and electrical device and interface board to be connected with a tester, where the shielding casing is L-shaped, on two sides of the L shape are OTA testing darkroom and full electric wave darkroom, mutually vertical and interconnected, and a set of turntable and tested equipment supporting device is arranged at the junction of the two darkrooms. And it can reduce darkroom construction cost and raise utilization ratio.

The invention discloses an optical imaging device as well as a manufacturing method and application thereof. The optical imaging device comprises an identification carrier, a darkroom shell, an image sensing device and a light source, wherein the identification carrier is provided with a transparent object space identification area; the darkroom shell forms a darkroom and has a through hole which is communicated with the darkroom; the image sensing device comprises an image sensor which is mounted in the darkroom; the light source is mounted outside the darkroom shell; and when an identification object is placed in the object space identification area, an emission light ray emitted by the light source emits to the object space identification area and further reaches the surface of the identification object to be reflected, and then passes through the through hole to be projected to the image sensor, so that the identification object is imaged through the optical imaging system via a pin-hole imaging principle.

The invention discloses an OTA test system and method for NB-IoT equipment, wherein the system comprises: a darkroom; a rotating platform arranged in the darkroom and used for placing to-be-tested equipment which is narrowband IoT (Internet of Things) equipment based on a cellular network; an annular antenna support frame which is vertically arranged in the darkroom and on which a plurality of antennas are distributed; a control terminal; and a comprehensive test instrument which is connected with the to-be-tested equipment and the control terminal and is used for measuring transmitting performance and receiving performance of the to-be-tested equipment under control of the control terminal. The OTA test system and method provided by the invention solve a technical problem that the OTA test system for the NB-IoT equipment is absent in the prior art.

The invention discloses a quartz rod bubble detection and quality grading method based on machine vision. The method comprises the following steps: S1. a quartz rod is placed in a darkroom, a laser beam is irradiated from one side to the quartz rod, and an industrial camera is used for shooting a grey-scale image of a quartz rod cross section; S2. noise removing, threshold segmentation, and binaryzation of the grey-scale image are carried out in order, and a binary image is obtained; S3. a connected domain of the binary image is labeled by a course-based connected domain labeling method, and the labeled connected domain is a bubble; S4. characteristics of the bubble are extracted from the connected domain, and quality of the quartz rod is graded according to the characteristics of the bubble. Bubbles in the quartz rod can be detected based on image processing techniques, detection standard is unified, capability for resisting interference of ambient light is high, and bubbles in the quartz rod can be rapidly and accurately detected.

The invention discloses a test method and device of total isotropic sensitivity (TIS) in a multi-antenna multi-input multi-output (MIMO) system. The test device comprises a base station emulator, a multipath fading channel simulator and a darkroom, wherein the darkroom comprises test antennas and a tested device, wherein the test antennas and the tested device are arranged in the darkroom. When the device is used for testing the TIS, the base station emulator generates emission signals of multiple transmitting antennas, wherein the emission signals have cross polarization characteristics and adopt space-time codes or space-frequency codes; the multipath fading channel simulator adds corresponding channel parameters and noise interference parameters to the emission signals, and transmits the faded emission signals to the test antennas in the darkroom so as to transmit the faded emission signals to the tested device; and the tested device performs multi-antenna receiving on the emission signals, and carries out maximum ratio combining (MRC) on the received signals as well as acquires the TIS in accordance with the combined received signals. According to the invention, the test of the TIS in the multi-antenna MIMO system can be realized.

The invention provides a radiation emission test system and a radiation emission test method, and relates to the technical field of electromagnetic compatibility test. The radiation emission test system includes a control device, a signal source, a receiver, a radio communication tester, a radiofrequency signal processor, a filter, a radiofrequency cable, a general purpose interface bus (GIPB) cable, an electric wave darkroom, a preamplifier, a measuring antenna, an antenna tower, an antenna cable, a test rotary table, a radio communication tester antenna and a pre-embedded cable. The preamplifier, the measuring antenna, the antenna tower, the test rotary table and the radio communication tester antenna are arranged in the electric wave darkroom; and the pre-embedded cable is embedded in the wall of the electric wave darkroom or under the ground. By establishing a mathematical model of the electric field intensity for the radiation emission test system and analyzing various uncertain source components of the radiation emission test system, the expanded uncertainty of the radiation emission test system can be determined so that a test result can be revised, and the accuracy and the reliability of a final test result can be raised.

The invention discloses an electromagnetic measurement comprehensive darkroom for electromagnetic compatibility test and antenna measurement. The structure is that the top surface and all side surfaces of the darkroom are fully paved with full-frequency-band wave-absorbing materials, and the bottom surface of the darkroom is fully paved with movable full-frequency-band wave-absorbing material; the full-frequency-band wave-absorbing material unit is of the tetraquetrous cone shape, the top opening angle is 17-20 degrees, the surface resistance is 50-100ohm, and non-woven fabrics serve as the bearing base material. The electromagnetic measurement comprehensive darkroom can meet the test environment required by the electromagnetic compatibility test and the antenna measurement at the same time, one room has two functions, and the cost can be saved compared with constructing an electromagnetic compatibility darkroom and a full-anechoic darkroom respectively; meanwhile, the relevant costs of land utilization, subsequent maintenance and the like can be saved.

The invention discloses a lens watermark defect image detection device. The detection device comprises a darkroom cabinet, and a bracket, a light source, a lens holder, a camera and a light screen, which are mounted in the darkroom cabinet. The lens watermark defect image detection device is characterized in that the light source, the lens holder and the light screen are mounted on the bracket from top to bottom; the center of the light source and the center of a supporting part of the lens holder are located on the same axis; the light screen is located below the lens holder; the area of the light screen is larger than that of the supporting part of the lens holder; the camera is located on the side face of the light screen and the vision field of the camera covers the light screen; the camera is connected with a computer by a data line; the computer is used for obtaining an image photographed by the camera and judging the size of a watermark defect. According to the lens watermark defect image detection device, the detection time of a lens is shortened and the detection efficiency of the lens is improved.

The invention discloses a device and method for detecting ultraviolet photoelectronic imaging system performance parameters. The whole detecting device comprises a deuterium lamp light source (1), a light filter wheel (2), an iris diaphragm (3), an integrating sphere (4), an ultraviolet intensity detector (5), an ultraviolet object distinguishability testing target (6), a testing darkroom (7), a main control circuit (11) and a main control computer (16). The main control computer (16) adjusts the light source, the light filter wheel and the iris diaphragm to output ultraviolet light, the ultraviolet light is converted into even area array light through the integrating sphere, and then the ultraviolet light irradiates an ultraviolet photoelectronic imaging system (10) to be tested in the testing darkroom. The main control circuit carries out noise reduction, collecting and analog-digital conversion on output signals of the ultraviolet photoelectronic imaging system to be tested, and then the output signals are sent to the main control computer. The main control computer computes obtained data, and the performance parameters of the ultraviolet photoelectronic imaging system to be tested are obtained. An optical environment which can change accurately is provided for the tested ultraviolet photoelectronic imaging system, testing stability is high, and the device and method are suitable for detecting the performance parameters of all ultraviolet photoelectronic imaging systems.

The invention provides integrated portable standardized traditional Chinese medical science tongue image acquiring equipment which has the characteristics of standard imaging environment, high color fidelity, high imaging quality and humanized man-machine interaction. The equipment comprises a camera, a standard imaging light source, an equipment shell for simulating darkroom environment, a computer, a display, a jaw support and a standard color card, wherein the camera, the standard imaging light source, a power supply, a monitoring television, a heat radiating fan, the jaw support and the standard color card are arranged in the shell for simulating the darkroom environment; the jaw support is arranged at the lowest side, a nose support is arranged in the middle, the standard imaging light source is arranged between the camera and the standard color card, and the heat radiating fan is arranged on the upper part of the shell for simulating the darkroom environment; the camera is connected with the computer; and the computer is connected with the display. The invention is suitable for traditional Chinese medical science diagnosis and treatment and traditional Chinese medical science objective researches and has the characteristics of high integration degree, standard imaging environment, high color fidelity, high imaging quality and humanized man-machine interaction.

The invention relates to a luminance and chrominance correction production line for LED (light-emitting diode) display modules. The production line comprises a track, a plurality of stations, a plurality of image acquisition devices and a track computer system, wherein the stations are arranged on the track and include a plurality of first darkroom stations; the image acquisition devices are arranged in the first darkroom stations respectively, and used for performing image shooting on pictures different in color and sequentially displayed by the to-be-corrected LED display modules loaded on the track respectively to obtain color image data; the track computer system is used for controlling the motion of the track and controlling the to-be-corrected LED display modules to display the pictures different in color, and is in signal connection with the image acquisition devices to obtain the color image data. According to the production line, various color image information of the LED display modules is acquired in an assembly-line manner through the image acquisition equipment, so that the correction efficiency is improved, the data acquisition is relatively accurate, the data acquisition errors caused by correction of different LED display modules by different image acquisition devices are avoided, and the correction manpower is reduced.

The invention provides a location test system for defects of an integrated circuit and an implementation method thereof, belonging to the field of electronic test equipment, and relating to a system for locating and testing the defects of the integrated circuit and an implementation method thereof. The system mainly comprises a control analysis unit, a laser generator, a laser distribution device,a laser scanning device, an acoustic oscillation generator, an optical microscope device, a sample electrification module, a weak light detection device, a rated current voltage measurement device, arated voltage current measurement device, a damping platform, a darkroom case, and the like. Due to the adoption of the invention, the physical position of various defects of the integrated circuit can be located intuitively, and the defects of the integrated circuit can be found in time and accurately so as to improve the product quality, accelerate the speed of research and development and improve the production technique level.

The invention discloses a BRDF quick measurement device based on hemisphere array detection. The BRDF quick measurement device consists of a laser, a fiber beamsplitter, a light power meter, a two-dimensional adjustment and laser collimation mechanism, a fully-closed hemisphere darkroom, an array photoelectric detector, a data collecting and processing system and an upper computer. According to the invention, complicated mechanical structures and electromechanical control systems are omitted, so that the structure is simple and the operation is convenient; the hemispherical fully-closed design is provided with the darkroom experiment environment, so that the system environmental adaptability is improved; through intensive array detection in the hemispherical space, the bidirectional reflectance distribution functions of all sampling angles of the reflective hemispherical space of a material to be tested can be measured quickly at one time within 2 seconds, so that the measurement efficiency is improved; complicated optical systems are not provided, the simple universal model that only the photoelectric detector and a high-speed digital circuit acquisition module are adopted is used for quick collecting and processing of multiple signals, so that the cost is relatively low.

A plant-growing device with light emitting diode comprises a darkroom, a generator, a gas collecting device and a water supplying device. The darkroom comprises an accommodating space and a plurality of light emitting diodes disposed in the accommodating space for producing a light beam irradiating the accommodating space. The generator is disposed outside the darkroom. The generator is configured to receive sunlight from the atmospheric environment and convert it into an electric energy and provide the electric energy for the light emitting diodes. The gas collecting device connected between the accommodating space and the atmospheric environment is configured to transfer carbon dioxide from the atmospheric environment into the accommodating space and discharge oxygen from the accommodating space into the atmospheric environment. The water supplying device connected to the darkroom is configured to transport water outside the darkroom into the accommodating space.

The present invention discloses a graphite oxide loading the nano metallic silver particle and the preparing method thereof. The graphite oxide is prepared by the following procedures: adding the graphite oxide into the dispersing agent to do ultrasonic dispersion and the mixed liquid forms; adding the silver salt solution to the mixed liquid prepared in the last procedure and stirring; doing stirring at the condition of darkroom condition; centrifugation, washing and vacuum furnace drying the mixed liquid obtained in the last procedure and the graphite oxide loading the nano metallic silver particle is obtained. The present invention fully uses the oxygen group on the surface of the graphite oxide to form the nucleation center, and the more surface area of the graphite oxide piece is used to facilitate that the nano metallic particles can uniformly subsides on the graphite oxide piece thereby reducing the agglomeration property of the particle and increasing the specific surface area of the particle; the composition prepared by the invention is combined with the property of graphite oxide and the metallic elemental silver, has a better application prospect and economic benefit in the fields of biological medicine and catalyzing, etc.

The invention discloses a target-body radar scattering cross section obtaining method and device based on darkroom frequency sweep. In the method and device, in a preset frequency range, according to preset frequency-sweep frequency points, a unit target point radar scattering cross section frequency domain information frequency which contains the different frequency-sweep frequency points is constructed and Fourier inversion is performed, so that unit target point radar scattering cross section time domain information is generated and software time domain gate processing is performed so that unit target point radar scattering cross section filtering time domain information is formed; Fourier inversion is performed on the formed unit target point radar scattering cross section filtering time domain information and unit target point radar scattering cross section filtering frequency domain information is obtained; and according to the obtained unit target point radar scattering cross section filtering frequency domain information, pre-obtained target-body radar scattering cross section filtering frequency domain information is corrected and a calibrated target-body radar scattering cross section is obtained. Through application of the target-body radar scattering cross section obtaining method and device, resource cost needed calibration and time needed in the calibration can be reduced.

The invention discloses a device and a method for measuring liquid jet on an outermost boundary. The device comprises a computer, a camera, a test section and a laser generator, jets are injected in the test section, laser sheet-light emitted by the laser generator irradiates on jet droplets, a focal plane of the camera, the laser sheet-light and an observing plane are on a same plane, the camera is used for shooting droplets in a laser plane, a camera shooting face and a laser sheet-light incident plane are transparent, the measuring device is disposed in a darkroom environment, and the computer collects shot images and binarize the images to obtain a jet boundary figure and calculates physical boundary distance information of the jet boundary figure. The method includes: A, demarcating the measuring device; B, utilizing the camera to shoot the droplets, and obtaining image results; C, converting the image results into a grayscale map, and extracting a boundary; and D, calculating the physical distance information of the jet boundary. By the device and the method for measuring liquid jet on the outermost boundary, quantitative information of the droplets, formed after the liquid jets are crushed, on the outermost boundary in a whole flow field observing plane, can be obtained.

The invention provides a simple and practical indoor polarization scattering measurement system, which is used for obtaining high-polarization-purity scattering data based on a vector network analyzer. The indoor polarization scattering measurement system is formed by the vector network analyzer, antennas, a main control computer, a microwave shielding darkroom and a turntable control cabinet. By filling a part of absorbing materials between the antennas, influence of mutual coupling between the antennas is reduced physically;and after converting broadband step frequency domain data to a time domain, near-end antenna mutual coupling signals are removed by utilizing selectivity of a time domain wave door. High-purity target polarization scattering characteristic data is obtained through a method of setting appropriate parameters and the like for the step frequency signals, and polarization data purity is higher than 45 dB; and the polarization scattering measurement system is simplified, and a lot of production cost is reduced.