29 results about "Stray radiation" patented technology

The invention relates to the field of infrared radiation measurement, in particular to a response drift correction device and method for a large thermal inertia infrared system, and the method comprises the steps: respectively arranging a temperature sensor on each optical structure in the large thermal inertia infrared system; placing the large thermal inertia infrared system in different environment temperatures, and carrying out radiometric calibration measurement on the large thermal inertia infrared system by using a calibration black body; temperature values measured by the temperature sensor at different environment temperatures form a temperature vector; calculating a variance expansion factor of each temperature vector, and selecting the temperature vectors meeting conditions as a characteristic temperature subset representing stray radiation in the infrared system; constructing an infrared system response model based on the characteristic temperature subset, and performing multivariate linear fitting on the infrared system response model based on data measured by radiometric calibration to obtain a model coefficient; and performing response drift correction on the large thermal inertia infrared system by using the corrected infrared system response model. The large thermal inertia infrared system response drift correction method can realize large thermal inertia infrared system response drift correction under a wide temperature range.

The application discloses a kind of satellite-borne infrared emissivity differential measurement method and device using cold black background, belong to spacecraft thermal control and material on-orbit testing technical field, purpose is to eliminate environmental stray radiation and conduction heat leakage interference, realize material emissivity high-precision in-situ on-orbit test.The application relies on deep space cold black environment and differential disturbance thought, supporting layout emissivity known standard unit and unit to be measured, make two in consistent light thermal condition, respectively establish transient heat balance equation.Because two kinds of units are consistent, such as common-mode interference of stray radiation, conduction heat leakage, two formula difference can be removed interference term, only keep and emissivity related radiation heat loss term.Through the design of different thermal control conditions (such as balance heating, constant temperature control, dynamic heating), the real emissivity of the material to be measured is solved.The application is suitable for in-situ, high-precision measurement of the infrared emissivity of spacecraft surface materials, especially intelligent thermal control materials such as thermochromic materials in space environment.

The utility model relates to the technical field of electronic equipment, and discloses a shielding piece and electronic equipment. Wherein the shielding piece comprises a conducting layer and a magnetic shielding layer, the conducting layer comprises a first section, a second section and a third section, the two ends of the second section are connected with the first section and the third section respectively, the first section and the third section are located on the two opposite sides of the magnetic shielding layer in the first direction respectively, and the first direction is the thickness direction of the magnetic shielding layer. The shielding piece can solve the problems of radiation stray and low-frequency magnetic interference at the same time.

The invention discloses a method for effectively removing stray light of an infrared image, belongs to the technical field of infrared camera image processing, and particularly relates to the method for effectively removing the stray light of the infrared image. The invention aims to solve the influence of stray light on an infrared image and improve the imaging quality of an infrared camera, and provides a method for effectively removing the stray light of the infrared image. The beneficial effects are that the traditional stray light suppression mainly suppresses stray radiation outside a view field from entering the lens by designing the light shield; the exposed edge pressing surface of the lens is strictly shielded; the primary scattering surface involved in stray radiation transmission is subjected to surface treatment, such as adding matt threads and spraying matt paint. According to the methods, hardware is changed for suppression, troublesome hardware changes need to be carried out, and sometimes, the methods are not suitable for changing one device, however, the method can directly correct the collected image after imaging of the infrared camera to obtain an image with stray light eliminated, the method is more universal in the aspect of application, hardware design of the camera does not need to be considered, and the cost is reduced. The hardware cost is reduced and the production efficiency is improved. Moreover, the method also achieves a good effect in the aspect of stray light suppression, can remove stray light in the image while retaining image details, and improves the imaging quality of the image.

This invention belongs to the field of infrared radiation measurement technology, and particularly relates to a method for measuring infrared radiation characteristics by removing stray radiation. This invention obtains calibration coefficients from a large-aperture infrared optical imaging system that has already been calibrated in a high-low temperature chamber. Patch-type temperature sensors are installed at both ends of the large-aperture infrared optical imaging system. Combined with an infrared radiation measurement principle model, stray radiation caused by temperature inhomogeneity in the large-aperture optical imaging system can be calculated and eliminated, thereby improving the accuracy of infrared radiation characteristic measurements under target range conditions.

The application discloses an automatic control method and system for millimeter wave radar stray test, and relates to the technical field of electrical measurement. The method comprises the following steps: performing a pre-scan test on a millimeter wave radar device in a preset frequency range, synchronously controlling a position locator, obtaining stray radiation test data under different spatial poses, and automatically identifying and generating a marker point according to a preset stray signal screening rule; generating a final-scan test parameter according to the frequency and spatial pose information of the marker point, and performing a final-scan test; and comparing the test results under different spatial poses to generate stray test data. The application solves the technical problem that the existing millimeter wave radar stray test method cannot comprehensively cover the stray radiation characteristics under different spatial poses, and the test efficiency and accuracy are low, and achieves the technical effects of comprehensively covering the stray radiation characteristics under different spatial poses, improving the test efficiency and accuracy by automatically controlling and optimizing the test process.

The utility model discloses a kind of multilayer surface-mounted filters, it is related to microwave filter technical field, the utility model is replaced metal cavity / LTCC by adopting compression process multilayer substrate, avoid cavity bulky structure, overcome the problem of LTCC sintering deformation, realize the size is reduced substantially, simultaneously, by interlayer coupling resonance unit in vertical direction is partially overlapped, it can promote Q value to traditional single layer microstrip 2 times or more, and full-wrapped metal shell can replace traditional partial ground layer, reduce stray radiation leakage, can break through volume, loss, suppression, temperature drift and power and multiple bottleneck, to meet the use demand of filter in harsh environment.

The application belongs to the technical field of mechanical manufacturing, and discloses a special-shaped cold screen suitable for a low-temperature refrigerator, which comprises an outer cover, a filter is arranged on the top of the outer cover, a cold head is arranged in the inner cavity of the outer cover, a special-shaped cold screen body and a sensor chip are fixedly installed on the top surface of the cold head, a vacuum cover is arranged at the lower end of the outer cover, an air extraction interface is arranged at the lower end of the vacuum cover, and a flange and a lead ring are fixedly installed in sequence at the upper end of the outer wall of the outer cover. Through cooperation of the cold head, the sensor chip and other structures, the special-shaped cold screen is directly fixed on the cold head of the low-temperature refrigerator, part of cold energy is conducted to the special-shaped cold screen through heat transfer, the temperature of the special-shaped cold screen is reduced, the signal interference of thermal radiation on the sensor chip is reduced, the black body on the inner surface of the shell absorbs stray radiation energy reflected from the surface of the sensor chip, and the influence of stray radiation energy on the signal of the sensor chip is reduced.

This invention discloses a multi-energy quasi-monoenergy soft X-ray spectrometer for plasma radiation measurement, belonging to the field of X-ray detection technology. It includes an aperture group, an objective lens unit, and an image plane detector array with time resolution. The aperture group is used to define the incident solid angle of each measurement channel and suppress stray radiation. The objective lens unit consists of multiple quasi-monoenergy multilayer mirrors, each mirror surface corresponding to an independent measurement channel and including a background channel. Multiple measurement channels share a single energy point. The image plane detector array corresponds one-to-one with each measurement channel, forming a soft X-ray detection system with time-resolved measurement capabilities. This invention, using the above spectrometer, effectively avoids measurement uncertainties caused by the convolution inversion of energy spectrum distribution and energy response function, and is suitable for online soft X-ray energy spectrum diagnosis of inertial confinement fusion plasmas such as lasers and Z-pinch.

The present invention relates to the field of infrared radiation measurement, and in particular to a response drift correction device and correction method for a large thermal inertia infrared system. The method comprises: providing temperature sensors on each optical structure within the large thermal inertia infrared system; placing the large thermal inertia infrared system in different ambient temperatures and performing radiation calibration measurements on the system using a calibration blackbody; constructing temperature vectors from the temperature values ​​measured by the temperature sensors at different ambient temperatures; calculating the variance expansion factor of each temperature vector, and selecting temperature vectors that meet the conditions as characteristic temperature subsets representing stray radiation within the infrared system; constructing an infrared system response model based on the characteristic temperature subsets, and performing multivariate linear fitting on the infrared system response model based on radiation calibration measurement data to obtain model coefficients; and using the corrected infrared system response model to correct the response drift of the large thermal inertia infrared system. The present invention can correct the response drift of a large thermal inertia infrared system over a wide temperature range.

The invention relates to the technical field of nuclear radiation detection, and discloses a nuclear radiation hot spot imaging device and method.The nuclear radiation hot spot imaging device comprises a scintillator, a collimation fixing cavity, a light guide and a photoelectric detector which are sequentially arranged in the axial direction, the outer surface of the scintillator is provided with a lens structure, and the lens structure is a cambered surface protruding outwards; the lens structure is used for focusing rays emitted by a nuclear radiation source into parallel fluorescent beams and enabling the parallel fluorescent beams to penetrate through the scintillator, and when the parallel fluorescent beams irradiate the scintillator, the scintillator emits an optical signal; a plurality of collimation light windows are arranged on the collimation fixing cavity; a convex mirror structure with an outer convex cambered surface is adopted, isotropically emitted fluorescence is focused to be in a state close to parallel fluorescence, and scattering loss is reduced; the collimation fixing cavity is matched with the convex lens structure, so that collimation incidence of parallel fluorescent beams can be ensured, the incidence direction is effectively restrained, stray radiation interference is avoided, and the measurement accuracy is improved.

This invention provides a method for acquiring internal stray radiation from infrared optical systems. This method addresses the problem of calculating internal stray radiation energy during cold optics implementations of infrared optical systems. Compared to existing simulation methods, this method can rapidly calculate internal stray radiation from infrared systems. The primary source of internal stray radiation from infrared optical systems is spontaneous infrared radiation from the inner wall of the lens barrel, the lens frame, and the pressure ring. Based on radiation transmission theory, this invention establishes a corresponding model. By establishing a coordinate system for the inner wall of the lens barrel, the lens frame, and the pressure ring relative to the detector focal plane, a corresponding algorithm model is established to calculate internal stray radiation. This acquisition method provides rapid calculations and relatively accurate results.

The utility model discloses a kind of fresh mushroom irradiation fresh-keeping devices, including shielding cover, electron beam generating assembly and hang installation conveying component;The electron beam generating assembly is placed in shielding cover, including two groups of electron accelerator and scanning box of opposite arrangement, electron accelerator output end connects scanning box, scanning box is equipped with irradiation window;The hang installation conveying component includes driving mechanism, transmission chain and suspension unit, driving mechanism drives transmission chain by sprocket;The suspension unit equidistance is installed on transmission chain, and suspension unit includes several long row clamps, and every two long row clamps is a pair.In shielding cover, two groups of electron accelerator front and rear staggered distribution electron accelerator front and rear staggered distribution makes two groups of electron beam not directly cross in space, reduce the energy loss and stray radiation generated by electron beam mutual collision, improve the utilization efficiency of electron beam, reduce the pressure of shielding protection.

The invention discloses an automatic control method and system for millimeter-wave radar spurious test, and relates to the technical field of electrical measurement, and the method comprises the steps: carrying out the pre-scanning test of millimeter-wave radar equipment in a preset frequency range, synchronously controlling a position locator, obtaining the spurious radiation test data under different spatial poses, and carrying out the pre-scanning test of the millimeter-wave radar equipment; automatically identifying and generating mark points according to a preset spurious signal screening rule; generating a final scanning test parameter according to the frequency of the mark point and the spatial pose information, and executing a final scanning test; and performing maximum value comparison on the test results under different spatial poses, and generating spurious test data. The technical problems that an existing millimeter-wave radar stray test method is difficult to comprehensively cover stray radiation characteristics under different space poses, and the test efficiency and accuracy are low are solved, the stray radiation characteristics under different space poses are comprehensively covered through automatic control and optimization of the test process, and the test efficiency and accuracy are improved. And the test efficiency and accuracy are improved.

The application discloses a quantization disturbance method and device based on a Sigma-Delta modulation DAC, which comprises the following steps: calculating the difference between a determined modulation signal and a determined feedback signal as a target signal, and performing a preprocessing operation on the target signal to obtain an integral signal, wherein the preprocessing operation comprises integral processing; performing a quantization operation on the integral signal to obtain a target disturbance modulation signal, wherein the target disturbance modulation signal is used as a disturbance modulation signal of the DAC. It can be seen that, by performing integral processing on the calculated signal and performing a quantization operation on the signal after the integral processing, the accurate disturbance modulation signal used for disturbing the DAC can be obtained, the randomness of the quantization code word of the disturbance modulation signal is enhanced, the SFDR performance of the DAC is improved, the stray radiation of the DAC is ensured, the application is not dependent on the specific implementation structure of the DAC, has higher universality, and can be used simultaneously with DEM.

The invention provides a stray radiation optimization method and device of a radio frequency front end, a medium and a product, and relates to a wireless communication technology. The method comprises the following steps: acquiring a working frequency band of a modem connected with a radio frequency front end; according to the working frequency band, determining an isolation port when the radio frequency front end does not generate stray radiation; and controlling to set the isolation port to be in an isolation state. According to the method and the device, the isolation port when the radio frequency front end does not generate stray radiation is determined according to the acquired working frequency band of the modem connected with the radio frequency front end, and the isolation port is controlled to be set in the isolation state, so that when the wireless communication equipment enters the working frequency band, the isolation port is actively set in the isolation state; therefore, the generation of stray radiation at the radio frequency front end is effectively prevented or suppressed, and the hysteresis quality that passive processing can be carried out only after the stray radiation is generated in the existing method is overcome.

The invention belongs to the technical field of infrared radiation measurement, and particularly relates to an infrared radiation characteristic measurement method for removing stray radiation. Calibration coefficients are obtained through a large-aperture infrared optical imaging system calibrated in a high-low temperature box, patch type temperature sensors are installed at the two ends of the large-aperture infrared optical imaging system respectively, and stray radiation caused by the large-aperture optical imaging system with uneven temperature can be calculated in combination with an infrared radiation measurement principle model. Therefore, the precision of infrared radiation characteristic measurement under the target range condition is improved.

Provided are: an optically anisotropic layer capable of suppressing stray radiation from a light guide plate; a laminate; and a light guide element and a head mounted display which use the same. This optically anisotropic layer is formed using a composition containing a liquid crystal compound, and includes at least: a region A having a liquid crystal alignment pattern in which the direction of an optic axis derived from the liquid crystal compound changes while continuously rotating along at least one direction in a plane; and a region C not having the liquid crystal alignment pattern, wherein the region A includes, in at least a portion of a side edge part in contact with the region C, a region Ad in which the liquid crystal alignment pattern changes, and the width Dd of the region Ad and the thickness T of the optically anisotropic layer have the relationship T<Dd<25×T.

The invention relates to an infrared radiation detector (10a) comprising:– a cryostat (11) provided with a cold finger (12) and a window (13) transparent to the infrared radiation to be detected;– a cold plane (14) mechanically fixed and in heat exchange with the cold finger (12);– a detection block (15) in direct or indirect heat exchange with the cold plane (14); and– a cold screen or diaphragm (16), mechanically fixed and in heat exchange with the cold plane (14), and capable of limiting stray radiation;the cryostat (11) incorporating at least one zeolitic material (17a-17d) having a pore opening of between 5 and 8 Ångströms, configured to maintain a vacuum of less than 10-2 mbar in the cryostat (11) continuously throughout the lifetime of the infrared radiation detector (10a), even when the cold finger (12) is not cooled. Figure for abstract: Fig 2

Provided are: an optically anisotropic layer capable of suppressing stray radiation from a light guide plate; a laminate; and a light guide element and a head mounted display which use the same. This optically anisotropic layer is formed using a composition containing a liquid crystal compound, and includes at least: a region A having a liquid crystal alignment pattern in which the direction of an optic axis derived from the liquid crystal compound changes while continuously rotating along at least one direction in a plane; and a region C not having the liquid crystal alignment pattern, wherein the region A includes, in at least a portion of a side edge part in contact with the region C, a region Ad in which the liquid crystal alignment pattern changes, and the width Dd of the region Ad and the thickness T of the optically anisotropic layer have the relationship T<Dd<25×T.

The invention discloses a multi-energy-point quasi-single-energy soft X-ray spectrometer for plasma radiation measurement, and belongs to the technical field of X-ray detection, the multi-energy-point quasi-single-energy soft X-ray spectrometer comprises a diaphragm group, an objective lens unit and an image plane detector array with time resolution capability, and the diaphragm group is used for limiting incident solid angles of all measurement channels and inhibiting stray radiation; the objective lens unit is composed of a plurality of quasi-monoenergy multilayer film reflectors, the mirror surface of each quasi-monoenergy multilayer film reflector corresponds to an independent measurement channel and comprises a background channel, and the plurality of measurement channels share one energy point; and the image plane detector arrays are in one-to-one correspondence with the measurement channels to form a soft X-ray detection system with a time resolution measurement function. By the adoption of the spectrometer, measurement uncertainty caused by energy spectrum distribution and energy response function convolution inversion is effectively avoided, and the spectrometer is suitable for online soft X-ray energy spectrum diagnosis of laser, Z pinch and other inertial confinement fusion plasmas.

The invention discloses an infrared detector and cold optical component integrated packaging structure, which integrates an infrared detector and a cold optical component in a vacuum packaging shell, adopts a thin-wall structure with high thermal resistance, high strength and high rigidity to insulate heat and support, and constructs a three-stage temperature zone platform. And the working requirements of the infrared detector and the cold optical assembly on cross-temperature zone, low heat leakage and high structural stability at low temperature are met. In order to reduce heat leakage of a cold optical assembly caused by a thermal environment and suppress stray radiation, a low-temperature cold shield with the outer surface plated with gold and polished and the inner surface provided with a high-emissivity nano-particle coating is designed. The position adjustment of the optical lens can be realized by controlling the compression amount of the flexible corrugated pipe, and the optical path position correction is realized. The temperature control heating loops on the window flange and the cold optical substrate not only have the dual functions of adjusting the working temperature of the window lens and the cold optical assembly and baking, decontaminating and heating when low-temperature pollution occurs, but also can realize quick temperature returning after the test is finished, so that the time cost is remarkably saved.

The invention belongs to the technical field of mechanical manufacturing, and discloses a special-shaped cold shield suitable for a low-temperature refrigerator, the special-shaped cold shield comprises an outer cover, an optical filter is arranged at the top of the outer cover, a cold head is arranged in an inner cavity of the outer cover, and a special-shaped cold shield body and a sensor chip are fixedly mounted on the top surface of the cold head; the lower end of the outer side of the outer cover is provided with a vacuum cover, the lower end of the vacuum cover is provided with an air exhaust interface, and the upper end of the outer wall of the outer cover is fixedly provided with a flange and a lead ring in sequence. Through cooperation of the cold head, the sensor chip and other structures, the special-shaped cold shield is directly fixed to the cold head of the low-temperature refrigerator, part of cold energy is conducted to the special-shaped cold shield through heat transfer, the temperature of the special-shaped cold shield is reduced, signal interference of heat radiation on the sensor chip is reduced, and the reliability of the sensor chip is improved. The black body on the inner surface of the shell absorbs stray radiation energy which is irradiated on the surface of the sensor chip and is reflected, so that the influence of the stray radiation energy on signals of the sensor chip is reduced.

The invention provides an infrared radiation scanning comparison and magnitude traceability system in a vacuum low-temperature environment, and the system is characterized in that a scanning mechanism, an optical system, a cold trap, a modulator, a diaphragm, a cold shield and an infrared detector assembly are all located in a stray radiation suppression system; the scanning mechanism is used for scanning a measured target; the calibration source is used for realizing calibration and value traceability in the measurement process of the radiometer; the optical system is used for converging infrared radiation of a measured target and projecting the infrared radiation to the modulator; the cold trap provides a measurement basis for the system; the diaphragm is located between the modulator and the infrared detector assembly, and the cold shield is located in front of the infrared detector assembly; and the lock-in amplifier processes and outputs signals to the data acquisition processing and control device according to the signals of the infrared detector assembly and the modulator. The technical problem that in the prior art, high-precision measurement and value traceability of the infrared radiation value under the high and low temperature environment condition cannot be achieved can be solved.

The invention relates to an infrared radiation detector (10a) comprising: – a cryostat (11) equipped with a cold finger (12) and a window (13) transparent to the infrared radiation to be detected; – a cold plate (14) mechanically fixed and in heat exchange with the cold finger (12); – a detection block (15) in heat exchange directly or indirectly with the cold plate (14); and – a cold screen or diaphragm (16), mechanically fixed and in heat exchange with the cold plate (14), and suitable for limiting stray radiation; the cryostat (11) incorporating at least one zeolite material (17a-17d) having a pore opening of between 5 and 8 Ångströms, configured to maintain a vacuum of less than 10-2 mbar in the cryostat (11) continuously throughout the lifetime of the infrared radiation detector (10a), even when the cold finger (12) is not cooled. Figure for the summary: Fig 2

A flow cell, for detecting a fluidic sample separated by a sample separation apparatus, includes a cuvette, a flow channel formed at least partially in the cuvette and configured to enable a flow of the separated fluidic sample through the flow channel, an electromagnetic radiation inlet at which an excitation electromagnetic radiation beam is couplable into the cuvette, and an electromagnetic radiation outlet at which an emission electromagnetic radiation beam, generated by an interaction between the excitation electromagnetic radiation beam and the separated fluidic sample, is couplable out of the cuvette. A geometry of the cuvette is configured so that at least one point at the excitation backside surface of the cuvette is outside of a direct field of view of the electromagnetic radiation outlet.

The invention relates to an automatic analysis method for screening gradient temperature control configuration of an optical system, which comprises the following steps of: dividing the optical system into a plurality of temperature control modules, and setting an adjustable range of each temperature control module in a certain temperature interval; automatically traversing the temperature combination of each temperature control module by using a macro program in optical design software; after the macro program runs each time, automatically recording the imaging indexes of the optical system under the temperature combination, and screening the temperature combination meeting the imaging standard; all the temperature combinations meeting the imaging standard are sorted according to a certain standard, and the infrared stray radiation level under each temperature combination is further calculated; and selecting a combination with excellent imaging quality and the lowest infrared stray radiation level as an optimal temperature control configuration suggestion of the optical system. According to the method, the problems of energy consumption increase and function limitation caused by temperature control of the whole machine can be avoided, the analysis basis of the temperature control range is provided for the heat sensitive element, and the optimal balance between optical performance and heat control is achieved.

The invention relates to a CBCT imaging dose measurement method and system based on a simple die body, and belongs to the field of imaging dose measurement. The method comprises the steps that the simple die body of a first preset size is placed, and the simple die body is a solid water die body; placing an ionization chamber with a second preset size in the center of the solid water mold body for dose measurement; dose measurement is carried out by changing different measurement positions; and performing weighted calculation on the dose measurement values at different measurement positions to obtain a final dose value. Solid water is adopted as a simple die body, the die body is easy to obtain and high in universality, and the problem that a standard CT die body is less in preparation is solved. The volume of the solid water mold body is large, so that the dosage contribution of stray radiation can be considered more comprehensively, and the accuracy of imaging dosage measurement is improved. The sheet-shaped solid water can be arranged and combined, more fixed measuring points are provided, multi-point measurement is facilitated, high measuring flexibility is achieved, and a reliable foundation is laid for radiation protection optimization.

The invention discloses a variable cold diaphragm infrared detector testing Dewar structure which is composed of a Dewar shell, a cold shield assembly, a rotating device and a cold head. The cold shield assembly is positioned above the inner side of the Dewar shell, is adhered above the substrate of the cold head and is used for reducing stray radiation; the rotating device is arranged on a lead ring flange of the Dewar shell, extends to the upper part of the cold shield part and is used for controlling and changing the aperture size of the cold diaphragm of the detector; the cold head structure is located below the cold screen assembly. Through the design of the ultrasonic motor rotating device, the aperture size of the cold diaphragm can be accurately controlled in real time. The ultrasonic motor rotating device is compact and simple in structure and can stably operate for a long time under the low-temperature vacuum condition. The design of the truss and the base plate can reduce the requirements for the machining precision and the assembly precision, reduce the heat leakage at the position of the diaphragm and the overall thermal load of the Dewar, and accelerate the starting speed of the detector.