177 results about "Dark room" patented technology

The invention relates to the field of electromagnetic field technology and radio frequency signal testing, in particular to a radio frequency standard field generation system and method based on near-field beam forming, and the system comprises a control unit, a radio frequency signal generation unit, a radio frequency field control unit and a broadband radiation antenna array. The control unit carries a near-field electromagnetic wave synthesis mathematical model and is used for receiving a target field type setting requirement and calculating excitation amplitude and injection compensation phase required by each radiation unit configured in the broadband radiation antenna array; the radio frequency signal generation unit comprises a pulse modulation laser source and a plurality of semiconductor radiation units and is used for generating high-power programmable radio frequency signals; the radio frequency field control unit comprises an optical delay line and an FPGA matrix and is used for performing amplitude and phase regulation and control on the high-power programmable radio frequency signal output by the radio frequency signal generation unit; and the broadband radiation antenna array is used for receiving the regulated radio frequency signal and radiating the regulated radio frequency signal to the near-field space of the darkroom, and a target field pattern is formed through multi-unit electric field vector superposition.

The application discloses a kind of photovoltaic module dark current testing device, it is related to dark current detection device technical field, the detection device includes workbench, workbench is placed with cabinet, multiple drawers are slidably installed on cabinet, multiple current detection modules are evenly installed in drawer, workbench is installed with host computer, host computer is electrically connected with current detection module, temperature and humidity control assembly is provided on the cabinet, temperature and humidity control assembly adjusts the temperature and humidity inside cabinet, when drawer is completely pushed into cabinet, darkroom for accommodating photovoltaic module is formed, meet the lightless environment requirement of photovoltaic module dark current test, improve detection precision, host computer as the overall control unit of device forms the closed-loop control of "instruction issue-data acquisition-result feedback", display screen connected with host computer real-time display test state, real-time parameter and test result, replace artificial reading judgment, reduce error.

The application relates to the field of artificial network control, in particular to an artificial network control method, device and system for shielding across a darkroom. By using a fiber link and an internal battery power supply architecture in a fully-closed shielding darkroom, the interference of personnel on a test environment is completely eliminated, monitoring of parameters such as internal temperature and voltage of the integrated darkroom is added, zero-crossing synchronization noiseless operation of phase switching is realized, in addition, user end environment adaptive identification, driving parameter dynamic calibration and equipment life prediction are realized, and the needs of high-precision, unattended automatic phase switching and testing are met.

The utility model discloses an LED lamp detection device which comprises a detection table, the top of the detection table is fixedly connected with a detection box, the top of the detection box is covered with a fixing cover, the top of the fixing cover is connected with a brightness meter in a penetrating mode, the bottom of the fixing cover is fixedly connected with a hanging bracket, the hanging bracket is fixedly connected with an LED installation base, and the LED installation base is fixedly connected with a light source. The beneficial effects of the utility model are that the LED lamp to be detected is firstly installed on the LED installation seat, then the lifting mechanism drives the fixed cover to close the detection box, the LED lamp on the LED installation seat extends into the detection box to carry out darkroom detection, then the LED installation seat is controlled to be electrified, and the LED lamp can be conveniently and rapidly detected. During illumination, the brightness meter can detect the brightness, the heat dissipation mechanism can dissipate heat generated by the LED lamp in the detection process, the structure is reasonable, the brightness of the darkroom can be conveniently detected, and operation is convenient.

The invention discloses a synthetic aperture radiometer darkroom phase calibration method and device. The method comprises the following steps: installing a synthetic aperture radiometer and a point target emission source in a microwave anechoic chamber; in the first-stage test, unit antenna output ports are connected with equal-length test cables and connected to a microwave test instrument, a synthetic aperture radiometer is set to be in an antenna observation mode, and a point target observation unit antenna phase difference test is carried out; in the second-stage test, the output end of the unit antenna is connected with each receiving channel of the synthetic aperture radiometer, the synthetic aperture radiometer is set to be in an antenna observation mode, and a point target observation full-system phase difference test is carried out; in the third stage of testing, the synthetic aperture radiometer is set to be in a common noise injection calibration mode, and common noise injection calibration is carried out; and calculating and counteracting a near field effect phase difference, a unit antenna phase difference and a receiver channel phase difference to obtain an accurate noise distribution network phase difference parameter. Darkroom phase calibration is achieved under the near-field condition, the result is accurate, and the method is simple, convenient and practical.

The utility model discloses an on-line intelligent fluorescent magnetic trace distinguishing mechanism, which relates to the technical field of fluorescent magnetic powder detection and comprises a darkroom, a first conveying rack, a first blanking rack, a second blanking rack and a second conveying rack. The first conveying rack transversely penetrates through one side of the darkroom and extends into the darkroom, a first conveying belt is installed at the top of the first conveying rack, and the first discharging rack and the second discharging rack are arranged on the front side and the rear side of the first conveying belt correspondingly; the top height of the first discharging rack and the top height of the second discharging rack are matched with the top height of the first conveying belt, and the second conveying belt is arranged on one side of the back face of the first discharging rack. According to the utility model, a magnetized workpiece containing magnetic traces can be quickly and conveniently subjected to magnetic trace detection treatment with higher detection accuracy and higher safety, so that the detection work is time-saving and labor-saving, higher in efficiency and higher in safety.

The invention provides a hiding device for a test darkroom and the test darkroom. The top of the test darkroom is provided with a hiding parking area. The hiding device comprises a lifting mechanism, a turnover mechanism and a control system, and the lifting mechanism and the turnover mechanism can jointly form a closed wave-absorbing shielding surface through the control system so as to shield interference sources such as travelling vehicles in the hidden parking area. Driving or similar electromagnetic test interference sources can be effectively shielded and shielded, and the influence of the structure on the electromagnetic environment of the test darkroom is reduced.

A system performs a method of verifying an anechoic chamber. A plurality of electromagnetic waves propagate from an emitter located within the anechoic chamber. Each electromagnetic wave of the plurality of electromagnetic waves is associated with one of a plurality of configurations between the transmitter and a receiver in the anechoic chamber. A plurality of reflections from a reflective element in the anechoic chamber are received at the receiver. Each of the plurality of reflections corresponds to one of a plurality of configurations. For each of the plurality of reflections, an ellipse indicative of a range of reflective elements is determined. The intersection of each ellipse is positioned to determine the position of the reflective element in the anechoic chamber. The reflectance of the reflective element is compared to a threshold to validate the anechoic chamber.

The invention relates to an AI training multi-modal imaging-oriented glass defect data set acquisition device and method, and aims to solve the problems of inconsistent imaging quality, complex device structure and incapability of automatically constructing a high-quality multi-modal data set in the existing glass defect acquisition technology. The device comprises a darkroom structure, and a light source regulation and control module, a polarization regulation and control module, a spectrum regulation and control module, a diffuse scattering regulation and control module, a rotary loading platform and an imaging module which are integrated in the darkroom structure, and each module is controlled by a control unit in a coordinated manner; according to the method, a multi-dimensional parameter combination matrix is established, parameters are called in sequence to collect images and bind metadata, and a structured data set is output after image registration and fusion. According to the method, ambient light interference is inhibited through modular electric control design, the consistency and definition of defect images are improved, differentiated display of multiple types of glass defects is realized, a high-quality multi-modal data set with optical parameter labels is automatically constructed, and reliable data support is provided for AI defect detection model training.

The utility model relates to the technical field of darkroom gate control, and particularly discloses a darkroom gate control structure, which comprises a fixed plate, an overhead rail is fixedly mounted on the outer surface of the fixed plate, the fixed plate is fixedly mounted on the outer surface of a wall body, and an intelligent control networking panel is fixedly mounted on the outer surface of the wall body on one side of the fixed plate. According to the darkroom gate control structure, when a user needs to enter a darkroom, the user only needs to input a password through the intelligent control networking panel or recognize the face to control and start the servo driving motor, and the intelligent control networking panel records the information of the person entering the darkroom and uploads the information to the system; and the servo driving motor can drive the screw rod to rotate, so that the sliding block connected with the screw rod can move on the outer surface of the hanger rail to drive the door plate to automatically move, a user does not need to manually open the door plate when entering the darkroom, and identity information of the entering person can be recorded.

This invention belongs to the field of water environment monitoring technology, specifically relating to an in-situ spectral measurement device and method for shallow lakes. The measurement device includes a housing and a water-passing grid module. A vertical rangefinder, an adjustable mounting bracket, a fixed mounting bracket, and a communication module are mounted on the top of the housing. The adjustable and fixed mounting brackets are used to mount the light source and the spectrometer, respectively. A water inlet is vertically opened in the middle of the side wall of the housing. The water-passing grid module includes a light-blocking baffle and a traction ring. The light-blocking baffle is slidably mounted on the side wall of the housing and is correspondingly positioned to the water inlet. The traction ring is installed on top of the light-blocking baffle and is used to move the light-blocking baffle up and down along the water inlet as it floats with the water level. A signal trigger is located on the side wall of the housing near the top of the water inlet. This invention achieves fully automatic spectral measurement and combines the in-situ characteristics of field acquisition with the illumination stability of darkroom acquisition.

The utility model discloses a camera obscura for receiver testing. The camera obscura comprises a box body; a transmitting antenna, wherein the transmitting antenna is arranged in the box body; and the mounting seat is arranged in the box body in a sliding manner and is arranged to be used for mounting a test product. According to the camera obscura for testing the receiver, the transmitting antenna and the mounting base are integrated in the box body, and compared with a darkroom, the camera obscura which is independently designed does not need to be reserved in use and does not have a complicated process, so that the receiving and transmitting signal testing efficiency of the receiver can be improved; the camera obscura is small in overall size and convenient to move, portable design is achieved, a certain number of camera obscura can be customized according to requirements, receiver testing is facilitated, and using is more flexible; when the camera obscura is used for testing, only the cost for manufacturing the camera obscura and the tool cost for fixing different receivers need to be paid, so that the cost is greatly reduced.

The invention discloses a signal sending method and device. According to the method, information of a preset single-time sending duration and information of a preset sending time interval are obtained in response to a signal sending request, and the single-time sending duration and the sending time interval are both in positive correlation with a first distance between a sending device and a target object; according to the information of the single sending duration and the information of the sending time interval, determining the information of a single sending time period and the information of a sequence number corresponding to each single sending time period; in a preset corresponding relation between a sequence number and a sub-waveform signal, obtaining a target sub-waveform signal corresponding to the target sequence number, the target sequence number being a sequence number corresponding to the target single sending time period; and sending the target sub-waveform signal in the target single sending time period. According to the embodiment of the invention, the method can solve a self-interference problem when a wide pulse radar signal is used for measurement in a small darkroom environment, and guarantees the accuracy of a measurement result.

The application provides an AVM calibration method, comprising the following steps: determining at least one original calibration pattern in which corner point detection fails in a plurality of original calibration patterns laid around a vehicle and an original calibration pattern arrangement in which the at least one original calibration pattern is located; acquiring a redundant calibration pattern arrangement arranged at intervals with the original calibration pattern arrangement; performing a corner point detection algorithm on the original calibration pattern arrangement and the redundant calibration pattern arrangement to obtain corner points of a calibration pattern arrangement in which corner point detection succeeds in the original calibration pattern arrangement and the redundant calibration pattern arrangement, so as to calibrate AVM by using the corner points. The application also discloses a vehicle-mounted device and a storage medium. The application realizes the following advantages: without repeatedly adjusting light, without a special material calibration pattern and without constructing a darkroom and arranging controllable light sources, the operation process of AVM calibration is simple.

The invention relates to the technical field of unmanned aerial vehicle performance testing and electromagnetic compatibility, and discloses a method and system for evaluating GNSS anti-deception jamming performance of an unmanned aerial vehicle in a darkroom, and the method comprises the steps: adjusting the support rod diameter of a hoisting system, adjusting bearing parameters, and fixing the unmanned aerial vehicle in a central region of the darkroom according to the model of the tested unmanned aerial vehicle; the method comprises the following steps: starting system self-inspection, after ensuring that each module works normally, starting a first GNSS signal simulator to emit a real navigation signal, controlling the unmanned aerial vehicle to lift off and stably hover, and recording initial positioning precision P0 and flight attitude parameters including a pitch angle theta 0, a roll angle phi 0 and a yaw angle psi 0; synchronously starting a magnetic field interference source and a second GNSS signal simulator, and applying mixed interference according to a set time sequence; coupling noise is eliminated by using a mixed interference data processing algorithm; and judging whether the anti-deception jamming performance of the unmanned aerial vehicle reaches the standard or not according to a quantitative evaluation standard corresponding to the model, and recording an anti-interference critical value, thereby realizing accurate evaluation of the anti-deception jamming performance of the unmanned aerial vehicles of different models in an environment close to an actual complex environment.

The application discloses a kind of measuring camera image high dynamic range device and method, it is provided with optical darkroom, wide dynamic light source, lens and host computer, wherein lens is installed at the opening of optical darkroom, wide dynamic light source is installed in optical darkroom inside facing lens, and wide dynamic light source includes LED lamp group and time sequence control circuit module;The target surface of the scientific camera to be measured is connected with lens, and host computer is connected with the scientific camera to be measured to establish control connection and data connection;Host computer starts the scientific camera to be measured and sends measurement start instruction to time sequence control circuit module in wide dynamic light source, time sequence control circuit module starts LED lamp group and controls the light-emitting duration of each LED lamp, after the image is photographed to the scientific camera to be measured, it is uploaded to host computer, and host computer obtains the dynamic range of the scientific camera to be measured by detecting the number of LED light spot in image.This application obtains dynamic range by analyzing the image that the scientific camera to be measured is photographed to wide dynamic light source, effectively improves dynamic ratio measurement range.

The utility model provides a keyboard LED lamp brightness detection jig, which comprises a bottom plate, a cover plate, positioning pins, a lamp controller, a positioning shade block and an illuminometer, and is characterized in that at least two groups of positioning pins are arranged around each group of keycaps to quickly position the positioning shade block, so that the same detection position at each time is ensured, and the detection error is reduced; the positioning shielding block is attached to the cover plate, so that the pressing distance of the keycap is a specific value, the detection accuracy is improved, and certainly, the upper end face of the cover plate can be flush with the top of the keycap, namely, the keycap cannot be pressed; the lower end face of the positioning shade block is tightly attached to the cover plate, and external light cannot enter the detection cavity, so that the detection cavity forms a darkroom, and the detection accuracy is further improved.

The invention relates to a high-compactness large-view-field active and passive simulation rotary table, and belongs to the technical field of test simulation rotary tables. Comprising a gantry type base, an outer frame assembly, a middle frame assembly and a tested product. The gantry type base is of a horizontally-placed frame structure. The outer frame assembly is vertically and fixedly installed in the middle of the gantry type base. The middle frame assembly is installed in the middle of the outer frame assembly. A tested product is axially and horizontally installed on the middle frame assembly. The three-degree-of-freedom motion of the tested product in the space, namely rolling, pitching and yawing motion, is realized; the problem that a conventional rotary table structural form shields a field angle in the active and passive simulation process is solved, the overall structural size of the rotary table is effectively reduced, high-compactness design is achieved, and the adaptability of a rotary table product in a darkroom environment is improved.

The invention discloses a fluorescent penetrant detection method under a white light condition, and aims to solve the problems that when the ambient light illuminance is between 20Lx and 500Lx, a darkroom needs to be additionally built or lighting equipment needs to be added in the existing detection technology, and the correlation between parameters and sensitivity is fuzzy. The method comprises the following steps: firstly, establishing a white light illuminance-black light intensity-minimum recognizable defect size quantification correlation model, and then carrying out the steps of workpiece pretreatment, illuminance measurement and parameter initial determination, sensitivity test block verification, personnel qualification assessment, real-time parameter monitoring, remeasurement exception handling and the like. And accurate detection of the surface defects of the product in the illumination interval is realized. The method does not need additional equipment, quantifies the incidence relation between the detection parameters and the sensitivity, remarkably improves the detection efficiency and the result reliability, and is particularly suitable for scenes such as field operation and large-scale structure field detection.

The invention discloses a full-automatic lamp inspection machine for oral liquid, and relates to the technical field of lamp inspection machines for oral liquid. Comprising a working table, a discharging table arranged on one side of the working table, a baffle arranged on the outer wall of the working table, a feeding table arranged on the other side of the working table, a control end installed on the surface of the working table and a lamp inspection darkroom arranged in the working table. The discharging disc is rotationally connected to the side, close to the lamp inspection darkroom, of the workbench, and the feeding track is connected between the feeding table and the lamp inspection darkroom. By means of the lamp inspection machine, the problems that before an existing lamp inspection machine conveys oral liquid to a lamp inspection darkroom, the medicine liquid in a bottle can be rotated and shaken, floccules and precipitates in the medicine liquid are made to suspend, impurities can be accurately recognized in the follow-up lamp inspection link, and rotating and shaking of existing equipment still have an optimized space in the aspect of matching of force and rotating speed, so that the rotating and shaking effect is poor are solved. And floccules and sediments in the liquid medicine cannot be fully suspended, so that leak detection is easily caused in the subsequent light inspection process.

The invention discloses an environment-friendly electromagnetic shielding building material and a preparation method thereof, and relates to the technical field of building materials. The material is prepared by compounding nano copper cobaltate, magnesium aluminum hydrotalcite and polyvinylidene fluoride through gradient structural design. The preparation method comprises the following steps: preparing nano copper cobaltate particles, mixing the nano copper cobaltate particles with magnesium-aluminum hydrotalcite powder and polyvinylidene fluoride to form a composite film, and finally carrying out hot-pressing molding to obtain a final product. The problem that an existing electromagnetic shielding material is prone to interface fatigue failure under the dynamic mechanical load is solved, and high strength, high toughness, high shielding effectiveness and high environmental stability are achieved by optimizing the adding amount and the structure of the magnesium-aluminum hydrotalcite. The material is excellent in electromagnetic shielding, interlayer shear strength and fatigue life, and is suitable for building scenes such as microwave anechoic chambers and confidential conference rooms.

A glasses-free AR display device includes a half mirror, a darkroom-like structure, a display, an illumination, and a video controller. The half mirror is disposed upright on a floor. The darkroom-like structure is provided behind the half mirror. The display is disposed in the darkroom-like structure obliquely to a surface of the half mirror. The illumination illuminates a user located in front of the half mirror on the opposite side of the display. The video controller receives a video signal and causes the display to display a video.

The utility model provides a small-size folding light path visual training device which comprises a front shell, a middle frame and a rear shell which are connected in sequence, the front shell is provided with a lens device, and a visual training module, a left darkroom, a right darkroom, a flexible FPC and a reflection lens are arranged between the middle frame and the rear shell; the visual training module, the reflecting lens, the left darkroom, the right darkroom and the lens device jointly form a light path system. According to the visual training device with the small-size folding light path, the problems that an existing device is large in size, close in imaging position and poor in experience are solved, the visual training device is heavy to wear, the left eye and the right eye can see the same visual pattern through the spirally-arranged LED light sources, the left eye and the right eye share one visual cylinder, the size is saved, and the imaging distance is increased.

The application particularly relates to a harmless treatment method of nitrate wastewater based on microwave-assisted catalytic reduction, and the technical scheme is as follows: according to the mass ratio of catalyst to nitrate wastewater of 0.001-0.1:1, the catalyst is added into the nitrate wastewater to obtain a mixed solution; then 1-5wt% of a cavity scavenger in the mixed solution is added into the mixed solution, hydrochloric acid is used to adjust the pH of the mixed solution to 1-6, the mixed solution is stirred in a dark room for 1-2h to obtain a suspension I; then the suspension I is placed into a microwave reaction device, and is reacted under the microwave irradiation of 0.3-20GHz for 60-120min to obtain nitrogen gas based on the harmless treatment of the nitrate wastewater by the microwave-assisted catalytic reduction. The application has the advantages of simple operation, low cost, low energy consumption, and the prepared catalyst can be repeatedly used and easily used in large scale, the method has high conversion rate of nitrate, no secondary pollution, high selectivity of target product, and can realize the harmless removal of nitrogen.

The invention discloses a high and low temperature compact range darkroom satellite-ground link real-time simulation verification system, and belongs to the technical field of aerospace testing. The system comprises a compact range darkroom, an integrated high and low temperature control subsystem, an integrated cooperative control and link simulation subsystem, a radio frequency test subsystem and a mechanical support subsystem. The core innovation of the device is as follows: a polymethacrylimide (PMI) foam material with a dielectric constant close to that of air is adopted to integrally construct a closed temperature control cavity, so that electromagnetic measurement errors introduced by a traditional medium window at high and low temperatures are thoroughly eliminated; and through a high-precision synchronous control technology, wide-temperature-range environment simulation, phased array terminal calibration and dynamic satellite-ground communication link simulation are deeply integrated and synchronously carried out. According to the method, the real, efficient and closed-loop verification of the functions and performance of the satellite-ground communication system is realized in an equivalent in-orbit temperature environment, the test precision, authenticity and efficiency are remarkably improved, and the development of high-reliability spacecrafts is powerfully supported.

The invention discloses a photovoltaic module dark current testing device, and relates to the technical field of dark current detection devices.The detection device comprises a workbench, a cabinet is placed on the workbench, a plurality of drawers are installed on the cabinet in a sliding mode, a plurality of current detection modules are evenly installed in the drawers, and an upper computer is installed on the workbench; the upper computer is electrically connected with the current detection module, the cabinet body is provided with a temperature and humidity control assembly, the temperature and humidity control assembly adjusts the temperature and humidity in the cabinet body, and when the drawer is completely pushed into the cabinet body, a darkroom for accommodating the photovoltaic module is formed together, so that the requirement of a dark current test of the photovoltaic module on a non-illumination environment is met; the detection precision is improved, the upper computer serves as an overall control unit of the device to form closed-loop control of instruction issuing, data acquisition and result feedback, the display screen connected with the upper computer displays the test state, real-time parameters and test results in real time, manual reading judgment is replaced, and errors are reduced.

The present application relates to the assembly technology of foam darkroom material, in particular to a mounting method of sharp cone hard foam darkroom material suitable for extreme use environment, and belongs to the field of material engineering. The steel wire barb method is adopted, a hole is first drilled in the middle of the bottom of the sharp cone hard foam darkroom material unit, then one end of a metal round rod is fixed on the bottom plate, the other end of the metal round rod is loaded with a steel wire shaped by moulding, and the steel wire is inserted into the hole in cooperation with the hole in the bottom of the hard foam darkroom material, the steel wire in the hole plays a rebounding role to make the end of the metal round rod embedded into the hole of the hard foam, and a barb hook is formed to tightly fix the sharp cone hard foam darkroom material unit so that it cannot be moved and rotated at will, and fast and stable installation is realized. The method can tightly connect the sharp cone structure hard foam darkroom material with the metal bottom plate, and can effectively solve the problem of mass installation of foam darkroom material used in extreme use environment.

The utility model discloses an automobile lamp full-function optical performance detection device which comprises a cabinet body and an optical detection box, the optical detection box is installed in the middle of an inner cavity of the cabinet body, and a light type detection camera is installed on the upper right corner of the inner wall of the optical detection box through a support and a fastener structure. And a projection light type background is mounted on the left side of the inner cavity of the light detection box through a bracket and a fastener. The full-function optical performance detection equipment for the automobile lamp can be matched with a tool mould to see the rear of a lens as a self-made darkroom, interference of all external light is completely shielded, inflection points, brightness uniformity and overall judgment of a light-emitting area of the automobile lamp are detected through multi-camera deployment, whether animation detection of the automobile lamp meets production judgment or not is detected, and the detection efficiency is improved. And detecting the passing rate through a software algorithm. The detection efficiency and the detection accuracy are far higher than those of human eye detection, the manual misjudgment rate is greatly reduced, and effective guarantee is provided for the stability of the vehicle lamp in the using process.