12 results about "Radiation quality" patented technology

The utility model discloses a high-performance loudspeaker, which relates to the technical field of loudspeakers, comprises a loudspeaker box, and a voice coil, a magnetic group and a membrane group which are arranged in the loudspeaker box, and is characterized in that an accommodating space is arranged in the magnetic group, the accommodating space is communicated with the external space of the loudspeaker box, a passive radiator is arranged in the accommodating space, and the membrane group is communicated with the passive radiator. The passive radiator comprises a passive radiation mass block and a passive radiation vibrating diaphragm arranged on the periphery of the passive radiation mass block, and the passive radiation vibrating diaphragm is connected with the magnetic group. According to the utility model, through the structure of the magnetic circuit and the passive radiator, the performance of the loudspeaker is improved, and under the condition of the same rear cavity space, the loudspeaker has lower resonant frequency, better low-frequency response and larger sound radiation area, and can provide more loud sound.

A multi-channel spliced large-area array infrared camera relative radiation correction method belongs to the technical field of spaceflight optical remote sensing, and comprises the following steps: calculating a non-uniform correction coefficient based on onboard blackbody calibration data; acquiring an on-orbit image, correcting the on-orbit image, acquiring a corrected image, and acting on the corrected image by using the secondary correction coefficient and the channel correction coefficient calibrated in the laboratory to obtain a channel corrected image; a plurality of in-orbit images containing different time periods and scenes are accumulated, pixel gray value sequences corresponding to a preset reference channel and a to-be-corrected channel are extracted as sample data according to design values of overlapping pixels between channels of the in-orbit images, and the sample data of the to-be-corrected channel and the reference channel are taken as an x axis and a y axis respectively, so that the to-be-corrected channel is obtained. And according to the quadratic function correction model, correction based on the overlapping area is carried out on the image after channel correction, long-term calibration and correction of the on-orbit detector pixel response relative change under the condition that the inner black body is stable are realized, and the on-orbit image radiation quality is improved.

The invention provides an anti-radiation wall hole plugging structure, and relates to the technical field of wall threading plugging, the anti-radiation wall hole plugging structure comprises a mounting sleeve part, and a lead sheath sealing part is mounted on the mounting sleeve part; the lead sheath sealing piece is used for being attached to a wall body; a bending passing piece is mounted on the mounting sleeve piece; the bending passing piece is used for enabling a cable to pass through a wall body; a closed fixing piece is mounted on the mounting sleeve piece; the bending control piece is matched with the closed fixing piece, so that the lead pipe can be conveniently and quickly controlled to be bent after a cable penetrates through the interior of the lead pipe, the anti-radiation quality is guaranteed, the cable can conveniently penetrate through the lead pipe in the earlier stage, meanwhile, the bending control piece is utilized, the lead pipe can be controlled to be straightened again in the subsequent stage, and then the cable in the lead pipe is detached; the problems that according to an existing wall hole plugging structure, it is difficult for a thick cable to penetrate through, the cable is prone to being damaged when the cable is forcibly pushed to penetrate through, and it is inconvenient to conduct threading and then bend are solved.

The method includes: 1) obtaining the inherent property parameters of the target system and / or the environmental refractive index change value Δn; the target system is a multi-resonant coupled system and / or an asymmetric BIC system; 2) constructing an equation based on the environmental refractive index change value Δn and / or the obtained inherent property parameters in step 1); when the target system is a multi-resonant coupled system, constructing a relationship between the resonance peak Qr value and the environmental refractive index change value Δn. This invention belongs to the field of optical physics, and particularly relates to a method for controlling the Q value of an optical resonance peak and its application. When the target system is an asymmetric BIC system, the radiation quality factor law of the asymmetric BIC system is used; 3) calculating based on equations 1 and 2, and adjusting or changing the asymmetry factor α of the environmental refractive index change value Δn based on the calculation results of the Qr value and the adjustment purpose to achieve the control of the Qr value. This invention can control the Qr value through changes in the environmental refractive index.

The invention discloses a remote sensing image relative radiation calibration method and system based on quantiles, and relates to the technical field of remote sensing image processing, and the method comprises the steps: collecting satellite historical image data, and separating the data according to a spectral band; performing incremental sorting on pixel values of each column of the single-band image detector, and uniformly extracting quantile values to generate a quantile feature sequence of each column; calculating an arithmetic mean value of all columns under the same quantile level, and constructing global reference quantile distribution; constructing a linear mapping relation between each column quantile sequence and reference distribution based on a least square method, and obtaining radiation correction gain and bias coefficient of each detector column; correcting the original image column by column by using the coefficient; according to the method, vertical strip noise caused by non-consistency of sensor response is effectively eliminated, the limitation that traditional calibration is limited by meteorological conditions and platform maneuvering is overcome, and high-frequency and high-precision calibration timeliness and image radiation quality are remarkably improved.

The application discloses a kind of area response difference's face array satellite image relative radiation correction method considering difference. The method is first based on NSCT transformation to remove the coarse features of image, then remove the fine features of image by RCV, and then obtain the image mainly containing noise, estimate relative radiation correction coefficient by constructing prior model considering area response difference, and under the constraint of corresponding cloud mask, other images obtained by the same sensor are carried out relative radiation correction, so as to eliminate the imaging quality degradation of face array satellite image caused by inconsistent response of probe element, and improve the radiation quality of face array satellite image. By removing coarse features and fine features, the application can effectively reduce the number of face array satellite images required for estimating relative radiation correction coefficient.

The application discloses a kind of multi-temporal remote sensing image database creation method and system, and the application relates to remote sensing image data processing technical field, comprising the following steps: S1: receiving multi-temporal remote sensing image data as input;S2: each image is carried out preliminary quality assessment, and this assessment is by extracting the radiation statistical characteristics of image, cloud amount index and the spectral correlation with reference image to construct multidimensional quality feature vector.The multi-temporal remote sensing image database creation method and system solve the core technical problems that traditional multi-temporal remote sensing image database creation process relies on manual intervention, processing efficiency is low and radiation consistency is difficult to guarantee;Through the complete quality guarantee system established from preliminary assessment to final decision, the standardization, automation control of mass image data radiation quality is realized, and the artificial cost is reduced and the database construction efficiency is improved.

The invention belongs to the technical field of radiation protection, and relates to an ionization chamber for radiation protection dosimetry and a dosimeter system thereof. Wherein the ionization chamber comprises a cylindrical ionization chamber shell (1) and a collector (2) arranged in the ionization chamber shell (1); the ionization chamber further comprises a supporting rod (3) connected with the ionization chamber shell (1), and a signal cable connected with the collector (2) and used for transmitting ionization chamber signals is arranged in the supporting rod (3). As a standard measuring instrument for a secondary standard dosimetry laboratory (SSDL) and a high-requirement user, the geometric configuration, the material and the thickness of the shell of the ionization chamber are reasonably selected, and the radiation dose can be accurately measured within a quite wide energy range on the premise that the sensitivity of the ionization chamber is guaranteed. According to the ionization chamber, within the range from low-energy X rays (40keV) to high-energy photons (1.25 MeV), the fluctuation of response along with radiation substances is smaller than + / -5%, and the problem of magnitude transfer deviation caused by energy dependence of a traditional reference chamber is solved.

This invention provides a wall opening sealing structure for radiation protection, relating to the field of wall wiring sealing technology. It includes an installation sleeve with a lead-sheathed sealing element installed on it. The lead-sheathed sealing element is used to conform to the wall. A bending and passing element is installed on the installation sleeve to allow cables to pass through the wall. A sealing and fixing element is installed on the installation sleeve. By using the bending control element in conjunction with the sealing and fixing element, it is convenient to first pass the cable through the lead pipe and then quickly control the bending of the lead pipe, ensuring radiation protection quality. This facilitates the initial cable passage through the lead pipe, and the bending control element allows for subsequent straightening of the lead pipe, enabling the removal of the cable inside. This solves the problems of current wall opening sealing structures where thicker cables are difficult to pass through, and where forcibly pushing cables through can easily damage them, making it inconvenient to pass the cable through first and then bend it.

The application discloses a remote sensing image stripe noise removal method and device, equipment and storage medium, and relates to the technical field of remote sensing image processing. The method comprises the following steps: acquiring a to-be-processed remote sensing image, constructing a smoothing constraint term based on an edge weight factor; calculating an average cross-track profile based on gradient information, and constructing a statistical constraint term; constructing a stripe sparse constraint based on an RBS regularization method; combining the smoothing constraint term, the statistical constraint term and the stripe sparse constraint to construct an optimization model for removing stripe noise, calculating the optimization model to remove the stripe noise, and outputting a clean image without stripe noise. The application combines the smoothing constraint term and the statistical constraint term, so that the constructed optimization model can fully consider the prior information of a potential clean image, and the prior information of stripe noise is fully utilized through the stripe sparse constraint, thereby effectively removing the stripe noise in a line array push-broom remote sensing image, and improving the radiation quality of the remote sensing image.

The invention discloses a method and system for creating a multi-temporal remote sensing image database, and relates to the technical field of remote sensing image data processing, and the method comprises the following steps: S1, receiving multi-temporal remote sensing image data as input; s2, performing primary quality evaluation on each image, wherein the evaluation constructs a multi-dimensional quality feature vector by extracting radiation statistical features and cloud cover indexes of the image and spectral correlation with a reference image; according to the method and system for creating the multi-temporal remote sensing image database, the core technical problems that in the traditional multi-temporal remote sensing image database creation process, manual intervention is relied on, the processing efficiency is low, and radiation consistency is difficult to guarantee are solved; through an established complete quality assurance system from primary evaluation to final judgment, standardized and automatic management and control of the radiation quality of mass image data are realized, the labor cost is reduced, and the database construction efficiency is improved.

The invention discloses a reference radiation field system of an accelerator R-F radiation substance and a construction method, and the system comprises an accelerator which is used for generating incident protons; the CaF2 target material is fixed in the direction perpendicular to the proton incidence direction, the experiment positioning system is arranged in the direction with the included angle of 0 degree in the proton incidence direction, the starting point of the experiment positioning system is located at the lower end of the CaF2 target material, the total stroke length is 5 m, and the experiment positioning system has the front-back, left-right, up-down and rotary movement functions; the dose rate selection module is used for carrying out R-F radiation substance low-energy pollution photon research in an area which is 0-1m away from the CaF2 target material, and selecting a dose rate value in a range of 1 [mu] Sv / h-1mSv / h in an area which is 1-5m away from the CaF2 target material according to an inverse proportion attenuation relation of a high-energy photon radiation dose rate along with the square of the distance; the first movable lifting positioning table is used for placing a sample and enabling the irradiated center position of the sample and an accelerator beam to be at the same height through lifting adjustment; the CaF2 target material, the experiment positioning system and the first movable lifting positioning table are all arranged in the target chamber.