39 results about "Leakage radiation" patented technology

A system and method for generating and using broadband surface plasmons in a metal film for characterization of analyte on or near the metal film. The surface plasmons interact with the analyte and generate leakage radiation which has spectral features which can be used to inspect, identify and characterize the analyte. The broadband plasmon excitation enables high-bandwidth photonic applications.

The invention discloses a refractive index sensor and a detection method thereof. The refractive index sensor provided by the invention comprises an exciting device and a measuring device, wherein the exciting device comprises a monochromatic light source, a focusing device and a sensor chip; the measuring device is composed of a leakage radiation microscope system comprising an oil immersion objective, an imaging lens and a CCD (Charge Coupled Device) camera; the light emitted by the monochromatic light source is incident to the sensor chip via the focusing device to excite a surface plasma excimer SP; the leakage radiation light of the SP is collected by the oil immersion objective and is incident to the CCD camera together with the other beam of reference light after passing through the imaging lens, so as to cause interference at the CCD camera; the CCD camera records the information of interferometric fringes; and the refractive index of a sample to be measured on the upper surface of a metal thin film is monitored according to the cycle of the interferometric fringes. The refractive index sensor has the advantages that only a wavelength light source is needed, the structure is simple and the cost is low; the measurement is not sensitive to the intensity fluctuation of an incident light source and the noise of a detector; the accuracy of the data measurement is improved; and the microminiaturization and multi-channel detection of the sensor can be realized.

The invention relates to a combination shielded room with leakage proof structures which comprises: a plurality of anti-radiation modules, a plurality of first connecting pieces, an anti-radiation door and leakage proof structures; wherein, the anti-radiation modules are suitable for forming the roof and the wall of the combination shielded room; the first connecting pieces are used for the corner connection of the anti-radiation modules; the second connecting pieces are used for the flat panel connection of the anti-radiation modules; the anti-radiation door is arranged on the wall formed by the anti-radiation modules and used for opening and closing the shielded room; the leakage proof structures are overlaid on the position at which any two anti-radiation modules are combined. The combination shielded room with leakage proof structures is formed by the combination of a plurality of simple anti-radiation modules, so not only the combination shielded room can conveniently realize the installation, deinstallation and transportation of the shielded room but also the leakage proof structure can effectively solve the problem of leakage radiation.

The invention discloses a method for simulating and predicting leakage radiation of an electronic equipment cabinet. The radiation field of the measurement surface near the surface of the electronic equipment cabinet is measured by a proximity probe, and the integral between the equivalent radiation source and the measurement field of the radiation of the electronic equipment cabinet is established. Equation model, solve the equation to obtain the equivalent radiation source of the electronic equipment cabinet, and then calculate the relative value of the electromagnetic field at any point in the external space of the electronic equipment cabinet. Measure the actual power of the calibration surface near the surface of the electronic equipment cabinet shell, and obtain the absolute value of the electromagnetic field at any point outside the electronic equipment cabinet after calibration. Because the method of full-wave modeling is adopted, it has nothing to do with the circuit form inside the electronic equipment cabinet, the specific form of wiring and joints, the operating frequency of the equipment, power consumption and current distribution, and has nothing to do with the position of the holes on the surface of the electronic equipment cabinet, The aperture size is also irrelevant, and the prediction of the radiation field is highly accurate.

The inVention discloses a flow-type CT examination deVice, which comprises a flow room and a scanning frame arranged in the flow room, wherein the flow room is proVided with an outer lead protectiVe layer, and the scanning frame comprises a shell, a slip ring arranged within the shell and an inner lead shield for shielding an emission source and a receiVing end therein. The CT examination deVice has high flow adaptability through the arrangement of a mobile room, such as a container, a cargo box, a carriage and the like, moreoVer, a container integrated structure is used, an examination and asupport circuit are integrated together, the requirements of flow use is largely met, a two-stage protectiVe measure is adopted. The inner lead protectiVe layer is adopted for leakage radiation absorption aiming at the key radiating area. Meanwhile, an outer lead protection layer is used on the side wall and the top wall of the flow house respectiVely, and if necessary, an outer protectiVe layer can be arranged on the bottom plate, and two-stage protection is proVided, the external protection effect is effectiVely improVed, and the radiation dose inside the flow room can be reduced as much aspossible.

The invention provides an adjustable-beam graphene wave leakage antenna. The adjustable-beam graphene wave leakage antenna can be used for generating wave leakage radiation of which beam is biased andis adjustable with an applied voltage and can cover a frequency band mainly being a low-terahertz frequency band, the volume size of the antenna under a 2THz frequency is 480 micrometers by 150 micrometers by 20 micrometers. The antenna mainly comprises an antenna radiation unit, a graphene voltage bias system and metal ground. The antenna has the advantages of small size, adjustable beam directional angle, relatively high gain and the like.

A treatment planning method and system for determining a treatment plan used to irradiate a treatment volume using a radiation treatment system that includes a multi-leaf collimator (MLC), is disclosed. The treatment plan includes settings for leaf patterns of individual leaves of the MLC, each leaf pattern including a geometry of the individual leaves and forming an aperture for use in the treatment plan. Areas of radiation leakage are identified in each of the leaf patterns, the areas of radiation leakage including first unshielded areas corresponding to gaps that are located between adjacent leaves and outside of the aperture. At least one leakage metric is calculated based on the areas of radiation leakage. A setting for at least one of the leaf patterns can be adjusted based on the at least one leakage metric.

The invention discloses a device and a method for detecting sub-wavelength-scale multi-focal light spot polarization orientation. An angularly polarized laser beam can generate multiple light spots different in polarization orientation on a focal plane after being modulated through a pure phase spatial light modulator. A periodic slit microstructure on the surface of a gold film is put on the focal plane, and when polarization direction of the light spots is perpendicular to orientation of a slit, incident light spots can be coupled into surface plasmons in a most effective manner. When the polarization direction of the light spots is parallel to the orientation of the slit, the incident light spots almost cannot excite the surface plasmons. When the polarization direction of the light spots and the orientation of the slit form an included angle smaller than 90 degrees, coupling efficiency is directly proportional to a squared value of cosine of the included angle. Surface plasmon intensity of a position where multiple light spots are located can be observed through a leakage radiation submicro imaging system, so that detection of polarization orientation of each light spot is realized.

The invention provides a leakage radiation testing method for an accelerator head. 24 testing points are determined on the accelerator head, and one thermoluminescent dosimeter is placed on each testing point. Each thermoluminescent dosimeter carries out leakage radiation testing on each testing point at the same time. The thermoluminescent dosimeters are taken of and the data are read after the testing is finished. The thermoluminescent dosimeters are low in cost and can be conveniently placed on testing points. Testing all testing points can be finished in one time, and the testing efficiency is substantially improved. The accuracy of the positions of the testing points is ensured, and the risk of damaging apparatuses is lowered.

The invention discloses a method for retaining freshness of a boiled salted duck based on electronic beam radiation. The method is characterized by comprising the following steps of: 1, processing a boiled salted duck semi-finished product by the conventional boiled salted duck production line, and splitting the boiled salted duck along the spinal column or the belly; then performing vacuum packaging; putting the vacuum packaged boiled salted duck into an electronic beam radiation device, and fixing the boiled salted duck, wherein the total thickness of the boiled salted duck is not more than 3.85cm; performing electronic beam radiation processing, wherein the energy is 10 Mev, the beam power is not less than 10 kW, and the radiation time is controlled to be shorter than 3 seconds, the radiation dosage is 3.5 to 4.55 Gy, and the absorption amount non-uniformity is less than 1.3; and bagging and storing. By the method, the boiled salted duck does not need to turn around during radiation, so that leakage radiation is prevented, and labor cost is reduced; and the fresh time is longer than 6 months.

In an electron beam tube arrangement, such as an IOT amplifier, an input cavity surrounds an electron gun. The cavity includes parts which are at high and low relative electrical potentials. These are separated by RF chokes to provide dc isolation whilst acting as a short circuit to high frequency radiation coupled into the cavity. The arrangement also includes a bypass capacitor located behind the electron gun which short circuits stray or leakage radiation to prevent deterioration of the amplified signal. The bypass capacitor presents a distributed capacitance of low inductance. In one embodiment, the RF choke and bypass capacitor include insulating material defined by a common member on which metallization layers are deposited.

The particle beam irradiation room of the invention includes: an irradiation execution room in which a patient table having a detachable-attachable top board and an actuation device for actuating the top board is mounted, and that is surrounded by a shielding wall; a passage formed in the shielding wall on its side where a pre-room for positioning the patient relative to the top board is located, in a form that allows the patient positioned relative to the top board to pass straight to the irradiation execution room by a transport apparatus; and a shielding door at the irradiation-room entrance located on a side of the passage toward the pre-room, for shielding against a leakage radiation at the radiation of the particle beam so that the leakage radiation is kept at a management value or less.

An x-ray apparatus that accepts an x-ray radiator therein has shielding for the x-ray leakage radiation originating from the x-ray radiator that is an Integral component of (built into) the x-ray apparatus. An x-ray radiator with an x-ray tube and a housing in which the x-ray tube is contained is composed only of materials that are not suitable for absorption of x-rays.

The invention relates to a displacement sensing device based on a Bloch surface wave one-way coupling effect. The device comprises a leakage radiation microscopy system, the leakage radiation microscopy system sequentially comprises a laser, a lens group, a polarizing film, a half slide, an incident objective lens, a displacement platform, a collection objective lens, a collection lens and an imaging camera along the trend of optical signals, a displacement sensing chip is arranged on the displacement platform, and the displacement sensing chip is a Bloch surface wave one-way coupling chip. According to the invention, the used incident light field is simple, vector beam shaping is not needed, and the extinction ratio of Bloch surface light field changes drastically along with the relativedisplacement of the incident light field and the chip, so that the sensing sensitivity and precision are high, and the response speed is high. Meanwhile, the measuring range is also increased. Besides, the Bloch surface wave one-way coupling chip used in the invention is of an all-dielectric structure, is easy to store and high in repeated utilization rate, has a high error-tolerant rate, is easyto process, and reduces the processing difficulty.

The invention discloses a primary loop coolant leakage radiation monitoring system and method. The system comprises a sampling pipeline, a purging pipeline, an exhaust pipeline, an F-18 aerosol detector and an inert gas detector. The purging pipeline and the exhaust pipeline are both communicated with the sampling pipeline, and a sampling inlet, a first stop valve, a second stop valve, a regulating valve, a flowmeter, a third stop valve and a fourth stop valve are sequentially arranged on the sampling pipeline in the airflow direction; a purging inlet, a fifth stop valve, a one-way valve, a sixth stop valve, an aerosol and iodine filter and a seventh stop valve are sequentially arranged on the purging pipeline along the airflow direction; an eighth stop valve, a first sampling pump, a ninth stop valve, a tenth stop valve and an exhaust port are sequentially arranged on the exhaust pipeline in the airflow direction. The method can be effectively applied to containment atmospheric radiation monitoring, the radiation monitoring precision and detection efficiency are high, the radiation monitoring continuity is good, and harm to the environment and human beings is avoided.

The invention provides mid-infrared heat-insulation packaged mid-infrared heating wall cloth which has a laminated structure and comprises a top surface covering layer, a porous polyethylene heat-insulation mid-infrared penetrable anti-puncture layer, an electric-to-mid-infrared emission film layer (emission source), a heat insulation layer, a bottom surface covering layer and a wall surface pasting layer; the infrared radiation intensity in the top surface of the wall cloth is up to more than 70% of the intensity of the emission source, and the leakage radiation of the bottom surface is less than 10%; and the emission source is composed of a conductive nano carbon plastic compound. The innovation of the mid-infrared heating wall cloth is derived from the special combination of quantifiable attributes, and porous polyethylene is utilized, so that the defect of high energy consumption of hot air convection heating is overcome, the mid-infrared radiation can be efficiently transmitted, and a user can be prevented from being burnt due to careless puncture of the heat insulation layer. The wall cloth is intelligent and environment-friendly, a plurality of rectangular independent electric control assemblies can be embedded or hidden in wall decoration, the on-off and heating power of each assembly can be regulated and controlled according to the position and temperature of a human body, and a subversive energy-saving heating system is formed.

The invention provides a shielding structure for connecting a golden finger end of an optical module, and the structure comprises a connector body, a shielding cover and a soft conductive material; the connector body is provided with an interface end connected with the optical module, and the soft conductive material is arranged on the interface end and can guide the optical module to be inserted into the connector body; the shielding cover is arranged at the upper end of the connector body in a buckled and matched mode so as to eliminate radiation leakage at the end of the connector body. The invention further provides a shielding mode for connecting the golden finger end of the optical module, and leakage radiation of the optical module can be greatly eliminated. The optical module can be directly used for replacing an existing connector component, a better shielding effect is achieved, EMI data of the optical module is reduced, the performance index and reliability of the whole system are improved, and the operation experience of a user is improved; in addition, the EMI design requirement for the optical module can be lowered, the cost of the optical module is lowered, and more exertion space can be achieved when a machine shell is designed.

The invention relates to a measuring bracket for measuring the leakage radiation under a machine head of a medical accelerator. The measuring bracket comprises a positioning plate, eight first connecting rods and eight second connecting rods, wherein the eight second connecting rods and the eight first connecting rods are respectively arranged in the corresponding directions along the circumferential direction of the positioning plate; the four first connecting rods, which are respectively positioned in the 12 o'clock direction, the 3 o'clock direction, the 6 o'clock direction and the 9 o'clock direction, are respectively provided with support rods; the first connecting rods, the second connecting rods and the support rods are respectively and correspondingly provided with first measuringpoints, second measuring points, third measuring points, fourth measuring points and fifth measuring points. The measuring bracket, provided by the invention, for measuring the leakage radiation underthe machine head of the medical accelerator has the advantages of being simple in structure, convenient to use, high in efficiency, and the like, can detect the key indicators of dosimetry, shorten the time used for position verification, installation, debugging and data collection, is in line with the domestic radiotherapy application status, and is conducive to the standardized application of medical institutions, technical service organizations and related departments.