58 results about "Dark chamber" patented technology

The embodiment of the invention relates to the field of antenna calibration, in particular to an antenna gain calibration system and method based on Rydberg atoms, and the system comprises a frequency stabilization module of a detection light source, a light path module, a microwave module, a signal detection module and a darkroom. A frequency stabilization module of the detection light source is used for stabilizing the laser wavelength of a semiconductor laser in a light path module, so that the laser wavelength is suitable for detection light of a Rydberg electromagnetically induced transparency (EIT) system; the light path module is used for generating coupling light and detection light; the coupling light and the detection light are oppositely emitted in an alkali metal atom gas chamber in the darkroom, alkali metal atoms in the alkali metal atom gas chamber are excited to be in a Rydberg state through two-stage excitation, and an EIT signal window needed by an experiment is obtained; the microwave module is used for generating and transmitting a microwave signal to control a microwave electric field in an experiment, and the microwave electric field influences an EIT signal; the signal detection module is used for converting the detection light into an electric signal, and the electric signal is collected through an oscilloscope in the signal detection module so as to be analyzed.

The utility model discloses an automatic calibration system for a radar liquid level meter, which relates to the technical field of radar liquid level meter production and comprises a PLC (programmable logic controller) module, an instrument fixing module, a reflecting plate lifting module, a laser ranging module, a microwave darkroom and an upper computer. The PLC module is used for controlling the whole system and collecting and transmitting data; the instrument fixing module is used for installing and fixing an instrument to be calibrated; the reflecting plate lifting module is used for controlling and realizing lifting of reflecting plates at all point positions; the laser ranging module is used for monitoring the reflecting plate closest to the instrument fixing module; the microwave anechoic chamber is used for providing a pure electromagnetic environment; and the upper computer inquires measurement information of the instrument and modifies parameters of the instrument. According to the utility model, the whole process of the calibration production link of the radar liquid level meter is automated, the measured value of an instrument is automatically read, and parameters are calculated and input in the process of realizing the sequential reciprocating lifting of each calibration point position reflecting plate, so that the dependence on manual operation control is eliminated, and the production efficiency of the calibration link and the product reliability are improved.

A fire smoke-detection method and detector based on particle shape characteristics for detecting particles in an optical dark chamber. An optical path angle between one blue light and one infrared light and a photoelectric conversion module is an acute angle, while an optical path angle between another blue light and the photoelectric conversion module is an obtuse angle. The detection method includes: starting a light source combination, calculating a change value between a current scattered light optical power and a background value of each light source, when the change value exceeds a set threshold, continuously starting the light source combination and constructing a space vector from the recorded change values, and using a classifier to classify a plurality of space vectors to obtain a plurality of classification results with categories including fire smoke and interfering aerosols; and counting the classification results to obtain the correct classification result.

A method for performing a lateral flow assay is provided. The method includes inserting a sample cartridge (201) in a dark chamber (220) and activating a light emitter (251) in the dark chamber (220). The method includes focusing an optical coupling mechanism (115a, 115b) in an image-capturing device (100a, 100b) to optimize an image of a sensitive area (202) in the sample cartridge (201) and capturing, with an image capturing device (100a, 100b), an image of a sensitive area (202) in the sample cartridge (201) after a selected period of time. The method also includes providing the image of the sensitive area (202) to a processor, wherein the processor comprises an image-capturing application (122). A system and a computer-implemented method to perform at least partially the above method are also provided.

This invention discloses an electromagnetic characteristic testing method for a large-scale vacuum anechoic chamber plasma environment, belonging to the field of microwave testing technology. The method includes: setting up an antenna movement device, an antenna protective cover, and a transmitting antenna in a large anechoic chamber; evacuating the large anechoic chamber to a vacuum and providing a stable plasma environment through a plasma source inlet within the chamber; connecting the transmitting and receiving antennas to a vector network analyzer; connecting the vector network analyzer to a computer; and using the computer to control the vector network analyzer to acquire antenna data in the large-scale vacuum anechoic chamber plasma environment, calculating the gain pattern and transmittance. This invention provides a stable large-scale anechoic chamber plasma environment, ensuring the repeatability of electromagnetic characteristic testing. The antenna movement device ensures that the movement state of the receiving antenna at every angle can be obtained, enabling rapid and large-scale acquisition of stable plasma antenna data.

This invention discloses a device for detecting the wall thickness of a transparent container, relating to the field of detection technology. It includes a dark chamber with a lid on top, an analysis component, a positioning component on the top of the lid, a light source component fixedly mounted on the side of the dark chamber, and a rotating component at the bottom of the inner cavity. A transparent container body is placed on the rotating component. This invention utilizes the fact that light rays incident at an angle to the surface of the transparent container body undergo two refractions upon passing through and after passing through the medium of the transparent container body, forming a three-segment light ray. The thickness of the medium of the transparent container body can be determined by the horizontal projection distance of the ray in the medium of the transparent container body. Furthermore, based on the known length of the horizontally emitted ray B, the percentage of ray A within the first medium can be calculated, thus yielding the target wall thickness.

The present invention relates to an apparatus (100) for the detection of at least one target analyte in a sample to be analysed applied to a diffractive sensor (1), including a housing (101) delimiting within it a dark chamber (102); a support device (105) suitable for supporting and integrally holding the diffractive sensor (1), said support device (105) being movable within the dark chamber (102) and between the inside and outside of the dark chamber (102); a source (103) of laser light suitable for emitting laser light with a wavelength within the visible spectrum in the darkroom (102); a screen (107) arranged in the dark chamber (102); a vision system (111) configured to capture images on the screen (107); and a control unit operatively connected to the laser source (103), the support device (105) and the vision system (111).

The device and method for testing the point source transmittance of a space camera based on the principle of reverse light path belongs to the field of stray light testing technology, and specifically relates to the stray light test of a space camera; it solves the problem that the test device is expensive and the test accuracy and test threshold are affected by stray light in the existing stray light test of large-aperture space cameras; the device includes: a light energy detector, a flat surface light source, a lens fixture to be tested, a darkroom, and a test tank; the light energy detector is used to parse the complete PST curve in the direction of the light path from the flat surface light source to a given optical entrance and then to infinity. The device and method for testing the point source transmittance of a space camera based on the principle of reverse light path are suitable for testing the point source transmittance of a space camera.

The utility model discloses a multi-view spectrometer which comprises a shell with an upward opening, a top cover is assembled on the top of the shell to form an internal accommodating space, a partition plate is arranged between the shell and the top cover, and the internal accommodating space is divided into a darkroom and an equipment room by the partition plate; an arc-shaped seat is assembled on the side wall surface of the shell at the darkroom, a plurality of probes are distributed on the arc-shaped seat at intervals along the arc-shaped direction, one probe is a scintillation measurement probe, and the other probes are spectrometer probes; a linear array sensor is mounted in the equipment chamber, and a display screen is embedded in the top cover at the equipment chamber; the whole structure is simplified, the darkroom and the equipment room are separately arranged, interference of light to the probe is effectively reduced, the acquisition accuracy of the lens is ensured, parallel acquisition and measurement of spectrums at all angles can be realized, the flicker characteristic can be synchronously measured, and the practicability is good.

The novel uniform light guide structure comprises a shell, a substrate, an LED light source and a light guide ring, the substrate is arranged in the shell, the LED light source is arranged on the substrate, the light guide ring is arranged on the shell, the inner end of the light guide ring is arranged above the LED light source, the shell comprises an upper cover, a main body and a base, and the upper cover is arranged on the main body. The upper cover is arranged above the main body in a covering manner, the main body is arranged on the base in a sleeving manner, a lightproof darkroom is formed between the main body and the base, and the substrate and the LED light source arranged on the substrate are arranged in the darkroom. And the light source is guided to the light guide ring through the light guide part, so that the light emitted by the LED is uniformly irradiated to the annular light emitting surface through a smaller space, and the beneficial effect of avoiding the problems of light leakage and light channeling is achieved.

The utility model relates to a simple and convenient particulate matter concentration detection device. Through the combination of the darkroom and the light source, a stable detection environment is provided, and the definition of image acquisition is ensured. Secondly, the sampling carrier can conveniently enter and exit from the darkroom through the arrangement of the conveying mechanism, and the detection efficiency is improved. The image acquisition device is matched with the image analysis device, so that the concentration of the particulate matters is automatically and quickly detected, and the requirement of knowing the pollution degree of the atmospheric particulate matters in the environment in real time is met. Through the combination of the technical characteristics, the device can quickly respond to particulate matter concentration detection requirements in real time in the fields of environmental monitoring and pollution prevention and control, and the detection time is shortened.

The present invention provides a spurious radiation test system and test method for a radio frequency transmitter. The system is a near-field test system, the test field is a microwave darkroom; the servo system is a one-axis precision turntable installed in the microwave darkroom, and the antenna of the radio frequency transmitter to be tested is set on the precision turntable; the radio frequency subsystem includes a vector network analyzer, and the vector network analyzer uses a test probe to receive the radiation signal of the antenna of the radio frequency transmitter to be tested to complete the amplitude and phase parameter test of the antenna of the radio frequency transmitter to be tested. The test method adopts a field test method. The present invention uses a one-axis turntable in conjunction with a probe array to achieve spherical near-field sampling of the electromagnetic field.

The invention relates to the field of semiconductor drift chamber detector measurement, in particular to a system and a method for testing drift characteristics of a semiconductor drift chamber detector. The test system comprises a double-sided probe station, a semiconductor drift chamber detector, a first double-channel digital multimeter, a second double-channel digital multimeter, a laser and an optical fiber clamp. The double-sided probe station is used for fixing and connecting the detector, the digital multimeter respectively applies bias voltage and acquires data, and the laser irradiates the back of the detector through the optical fiber. During testing, the wavelength of the laser is selected, the light power is adjusted, the detector is arranged on a darkroom double-sided probe station and connected with equipment, after illumination, voltage is set, current is monitored, the illumination position is adjusted, and whether the transverse drift characteristic is qualified or not is judged according to the current difference of different illumination positions. Compared with a traditional integrated test, the test system and the test method have the advantages that the test time is effectively shortened, the device iteration speed is improved, and the lateral drift characteristic of electrons in the semiconductor drift chamber detector can be conveniently represented.

The application relates to a kind of AR light machine field angle measurement methods based on camera calibration, comprising the following steps: preparing a black and white grid calibration board;Change the distance between calibration board and camera, so that the distance between them is greater than 10 times the focal length of camera;Transform the position of calibration board, repeat the direct imaging of calibration board by camera;Remove the calibration board, do not change the position and parameters of camera, control the direct projection of black and white grid image by AR micro display system;Adopt darkroom shooting mode, camera directly images light machine target;Through Zhang Zhengyou calibration method, the image of calibration board and the projected black and white grid image are calibrated and corrected, according to the calibration result, the focal length of camera at this time is recorded as f0;Image processing is carried out on the corrected image, the diagonal line size h of the image is obtained, and the diagonal line size is brought into the curve formula h=2f0·tanω of field angle-image height, and the measured field angle 2ω is directly solved.

This invention discloses a flat, compact field device with arbitrary aperture-to-height ratio. The device mainly consists of a flat, compact field aperture, a collimated flat plane wave quiet zone, and a feed source. The aperture-to-height ratio is arbitrary, but is recommended to be greater than or equal to 2. This invention also discloses a low-frequency limit design formula for arbitrary flat, compact fields. The low-frequency limit is determined by the aperture type, narrow-side electrical dimensions, and aperture-to-height ratio. A diagonal feed layout is recommended for flat reflector compact fields, which reduces the three-dimensional angle of the reflector towards the feed source, lowers the illumination level of the feed source on the reflector, thereby reducing the taper of the quiet zone amplitude and improving the aperture utilization rate of ultra-large flat, compact fields to 67%. The flattened compact field aperture reduces the aperture size and the height of the shielded anechoic chamber, reduces the self-weight deformation of the high-precision reflector, facilitates the engineering implementation and cost control of ultra-large compact fields, and ensures high-frequency and low-frequency limit performance.

This invention proposes a flow field visualization experimental device and method based on *Noctiluca scintillans* biosol, belonging to the interdisciplinary field of fluid mechanics experimental measurement and bio-optics. It addresses the shortcomings of existing flow field measurement technologies in terms of economy, safety, adaptability to complex boundaries, and engineering applications of biological tracer media. It includes a biosol culture module, a flow field experimental module, a bioactivity recovery module, a biosol storage tank, and a bioactivity calibration unit. The biosol culture module includes an LED light source and *Noctiluca scintillans* culture dishes. The flow field experimental module includes an experimental flow channel, imaging equipment, and a flow field excitation model arranged in an experimental dark chamber. The bioactivity recovery module includes a light-shielding tank. The biosol storage tank is connected to the light-shielding tank. The *Noctiluca scintillans* culture dishes, experimental flow channel, and light-shielding tank are equipped with bioactivity calibration units for detecting the emission peak value of the *Noctiluca scintillans* solution. It is mainly used for flow field visualization experiments.

The invention belongs to the technical field of nondestructive testing, and discloses a method for determining defects through translation secondary radiography of a contrast reference object, which specifically comprises the following steps: S1, appearance inspection; s2, preparing for radiographic inspection; s3, training the ray machine; s4, performing ray shooting inspection; s5, processing the film in a darkroom; and S6, negative film evaluation. The method has the advantages of simplicity, convenience and rapidness, realizes defect depth measurement, can be well applied to practical engineering, and efficiently guides practical work.

The invention belongs to the field of stray light suppression, and particularly relates to a stray light suppression capability test system, which comprises a stray light simulation source for emitting stray light, and a stray light incident angle adjustment module, a pose adjustment module, an irradiation detection module, an environment detection module, a background extinction cavity and a stray light suppression module which are respectively arranged in an optical camera obscura, the stray light incident angle adjusting module is used for adjusting the angle of stray light entering the optical camera obscura; the pose adjusting module is used for adjusting the pose of the optical system to be measured; the irradiation detection module is used for measuring the irradiance at a light inlet of the optical system to be measured; the environment detection module is used for measuring environment stray light energy in the field of view of the to-be-detected optical system; the background extinction cavity is used for absorbing residual stray light in a view field of the optical system to be detected; and the stray light suppression module is used for absorbing residual stray light outside the field of view of the to-be-detected optical system. Through the systematic innovative design, the precision, efficiency and reliability of the stray light suppression capability test of the optical system are comprehensively improved.

This utility model discloses a curing device for solar cells, including a variable-temperature dark chamber, a curing stage, and a curing lamp. Both the curing stage and the curing lamp are disposed within the variable-temperature dark chamber, with the curing lamp positioned above the curing stage. The curing device also includes a threaded movable bracket and a telescopic cylinder. The telescopic cylinder is fixed to the top of the variable-temperature dark chamber and located above the curing stage. The threaded movable bracket is connected to the telescopic cylinder and includes a screw, on which the curing lamp is mounted. This utility model allows for coarse and fine adjustments to the distance between the curing lamp and the curing stage using the telescopic cylinder and the threaded movable bracket, thereby adjusting the irradiation area of ​​the curing lamp. This enables the curing device to be applied to the curing of solar cells of different sizes. Simultaneously, the telescopic cylinder can drive the curing lamp to press down onto the surface of the solar cell, lightly touching and pressing the silicon wafer to inspect for microcracks.

The utility model discloses imaging equipment which comprises a shell, the shell comprises a first cavity, the first cavity is a darkroom space and can be opened or closed, an imaging assembly is arranged in the first cavity and used for converting optical signals generated by a detected sample into images, the shell further comprises a second cavity, and the imaging assembly is arranged in the second cavity and used for converting optical signals generated by the detected sample into images. The second chamber is arranged below the first chamber, a control mainboard is arranged in the second chamber, the control mainboard is in signal connection with the imaging assembly, the shell is further provided with an external port, the external port is electrically connected with the control mainboard, and the external port is used for enabling the imaging equipment to be in operable connection with external equipment. According to the imaging device, the control mainboard is arranged to enable the imaging device to be in operable connection with the external device, the imaging device can be debugged in real time according to the displayed image, various parameters can be conveniently adjusted, and an operator can conveniently select a proper operation mode according to own operation habits or operation environments.

This application provides a terahertz three-temperature testing system, relating to the field of automated testing technology. The system includes: a microwave dark chamber, a power-dividing waveguide assembly, a waveguide adapter assembly, a frequency up / down converter assembly, and an RF switching switch. A test probe is disposed at the center of the inner side wall of the microwave dark chamber, and a waveguide and a waveguide adapter structure are disposed on the top of the microwave dark chamber. The power-dividing waveguide assembly is disposed on the outer wall of the microwave dark chamber, opposite the test probe, and aligned with and connected to the waveguide. One end of the waveguide adapter assembly is connected to the waveguide adapter structure, and the other end is connected to the frequency up / down converter assembly. The frequency up / down converter assembly is connected to the RF switching switch, and the RF switching switch is connected to external testing instruments. This terahertz three-temperature testing system achieves the application requirements of high efficiency, small size, and high stability.

The invention discloses a modularized reflector array ultra-wideband plane wave synthesis system. The system comprises a microwave darkroom, a feed source array and a reflector array, wherein the feed source array and the reflector array are arranged in the microwave darkroom. The feed source array comprises N ultra-wideband feed source antennas, the N ultra-wideband feed source antenna units are arranged at equal intervals to form the feed source array, the main reflecting surface array is located in the middle of one side of the anechoic chamber, and the M main reflecting surface units are tightly arranged to form the main reflecting surface array. The plane waves formed by the M main reflecting surface units are synthesized into large-size plane waves, and a large-size measurement quiet zone is formed. According to the invention, a complex antenna array feed network is reduced, the insertion loss is greatly reduced, the system complexity is reduced, amplitude-phase errors caused by factors such as manufacturing processes and installation processes of a power division PCB and an independent power division PCB are eliminated, and the antenna has the advantages of high aperture utilization rate, low processing difficulty of a reflecting surface, low manufacturing cost and the like; the method is especially suitable for measurement of large-size targets.

A method for performing a lateral flow assay is provided. The method includes inserting a sample cartridge in a dark chamber and activating a light emitter in the dark chamber. The method includes focusing an optical coupling mechanism in an image-capturing device to optimize an image of a sensitive area in the sample cartridge and capturing, with an image capturing device, an image of a sensitive area in the sample cartridge after a selected period of time. The method also includes providing the image of the sensitive area to a processor, wherein the processor comprises an image-capturing application. A system and a computer-implemented method to perform at least partially the above method are also provided.

The glaucoma clinical darkroom test eyeshade comprises an eyeshade body, an adjusting assembly and a supporting sliding assembly are arranged on the back face of the eyeshade body, the adjusting assembly is used for adjusting the angle of the eyeshade body, the supporting sliding assembly is used for adjusting the height of the eyeshade body and supporting the eyeshade body, and the adjusting assembly comprises a concave block and a connecting block; a rotating shaft is rotatably connected to the interior of the concave block, the two ends of the rotating shaft penetrate through the two sides of the concave block and are fixedly connected with rectangular blocks, the rotating shaft is further fixedly sleeved with a connecting block, one side face of the connecting block is fixedly connected with the back face of the eye patch body, and a fixing rod is fixedly connected to the lower surface of the rectangular block; according to the eye patch, two kinds of inspection can be completed without using two kinds of instruments, the purpose of adjusting the height of the eye patch body can be achieved, the purpose of supporting the eye patch body can also be achieved, and then the effect that a tester does not feel that the head falls down in the long test process can be achieved.

The utility model discloses a movable wave-absorbing shielding darkroom, which relates to the technical field of shielding rooms and comprises a shielding room main body, supporting legs are fixedly mounted at the bottom of the shielding room main body in a symmetrical structure, and a first supporting plate is connected between the supporting legs below the shielding room main body in a buckling manner. Universal pulleys are rotationally connected to the bottoms of the first supporting plate and the second supporting plate in a symmetrical structure, and auxiliary pulleys are arranged at the bottoms of the first supporting plate and the second supporting plate and located on the inner sides of the universal pulleys. When the shielding room main body needs to be moved, the whole moving device is firstly carried to the lower part of the shielding room and is positioned in the middle of the supporting legs, the universal pulleys can rotate towards multiple directions, the auxiliary pulleys play roles in auxiliary supporting and stable movement, and the shielding room main body can be moved according to actual requirements. The moving device can be selectively left at the bottom of the shielding chamber main body, so that subsequent re-movement is facilitated; and the moving device can be moved away from the bottom of the shielding room body, so that the device can be used for moving other types of shielding room main bodies.

The utility model belongs to the technical field of antenna testing, and discloses an antenna rapid test translation stage, which comprises a mounting base and a support frame, the front side of the support frame is fixedly connected with a rotation driving device, the two sides of the top surface of the mounting base are fixedly connected with sliding rails, the sliding rails are slidably connected with a plurality of sliding blocks, and the sliding blocks are fixedly connected with the support frame. The supporting frame is fixedly connected to the tops of the multiple sliding blocks, a horizontal driving mechanism is further connected between the mounting base and the supporting frame, the driving end of the rotary driving device faces the front side and is detachably connected with a flange frame, and the portion, located outside the rotary driving device, of the supporting frame is detachably and fixedly connected with a protective shell. By adopting the design of double sliding rails, the driving motor can drive the driving screw to rotate, the driving screw rotates to drive the driving block and the supporting frame to slide stably, then a product to be tested is stably pushed into the dark box and the dark chamber, the mounting base is conveniently mounted on the dark box wall or the dark box side wall, the structure is stable and reliable, and production and assembly are convenient.

The invention discloses a phased-array antenna beam forming test method in a darkroom-free environment, and relates to the technical field of satellite communication terminal complete machine testing, comprising the steps of initializing test system configuration, setting test parameters, initializing an antenna state, establishing a test environment, and connecting a test antenna with a channel simulator; cross coupling of non-corresponding channels is isolated and reduced through an algorithm, a signal transmission link between a test antenna and a tested antenna is established through a wireless channel by adopting a virtual wire connection mode, non-contact test is realized, beam forming test is performed, a mobile station moves to a preset test area, impedance of the test antenna is adjusted by adopting an electronic tuning mode, and the antenna is tested. The beam former realizes independent control of an uplink and a downlink, analyzes a test result and generates a report, does not need to depend on fixed test facilities such as a microwave anechoic chamber and a calibration tower, can directly test in an actual working scene, and is particularly suitable for field test of mobile equipment such as a large vehicle-mounted phased array system.

The present application relates to a kind of microwave darkroom static area automatic acquisition method, microwave darkroom static area is under the static area of reflectivity level and amplitude unevenness;The static area under reflectivity level is obtained using initial seed point selection algorithm and growth algorithm;The automatic acquisition of amplitude unevenness index range is based on the reflectivity level range, by selecting amplitude unevenness standard point as initial seed point, also in the way of neighborhood growth;The calculation of amplitude unevenness growth process only needs to extract its amplitude from the previous reflectivity level calculation result, and compare with standard point amplitude;Static area is the spatial range under the superposition of two indicators.The present application realizes the static area of the required static area index three-dimensional space, realizes static area extraction automation.

The invention discloses an active control and collaborative support construction method for an inclined shaft open channel-hidden tunnel junction section, and belongs to the technical field of mine and tunnel engineering construction. The method sequentially comprises the following steps that guniting protection is conducted on an open channel excavation upward slope, and a surface stress closed shell is formed; an advanced pipe shed is constructed on the arch portion of the hidden tunnel, grouting is conducted, and a deep pressure-bearing arch and a composite stress shell are formed; mechanical excavation is conducted under protection of the composite pre-supporting system, and a U-shaped steel retractable support is immediately erected to serve as a temporary support; a reinforced concrete permanent well wall is constructed on the inner side of the temporary support; and finally, wall back grouting backfilling reinforcement is carried out, and a full-ring closed three-dimensional waterproof and drainage system is formed. The core of the method lies in that a linked active control and collaborative supporting system is constructed, and the industrial problems that surrounding rock of the light and shade junction section is poor in stability and prone to collapse and water seepage are effectively solved through temporary and permanent supporting conversion combining composite pre-supporting, yielding and pressure resistance and three-dimensional water prevention; and the construction safety and the engineering quality are obviously improved.