6 results about "Leakage radiation" patented technology

The invention relates to a double-layer multi-leaf collimator with a self-monitoring function and a using method thereof, and belongs to the technical field of radiotherapy equipment.The double-layer multi-leaf collimator is subjected to multiple times of image acquisition through an image acquisition assembly, the actual position and the preset position of a grating leaf are judged based on the self-monitoring function of a backlight path, and the real position of the grating leaf is determined. The leakage emission rate is further reduced, the dynamic intensity modulation capability is improved, an external sensor is not needed, and the system integration degree is high. Micron-scale control of the grating blade position is realized through optical feedback, and the high-precision treatment requirement is met. By utilizing the mutual shielding effect of the two layers of blades, the effects of simplifying the accelerator layout, reducing leakage radiation and improving the projection resolution of the blades are achieved, the device is mainly used for stereotactic radiotherapy of tumors and other adaptations, blade position errors caused by motor faults and mechanical faults of a multi-blade collimator are avoided, and the reliability of the device is improved. And irradiation errors are further avoided.

A method for identifying the cessation of a rotatable microwave distribution device (8) of a household microwave appliance (1), wherein during the feeding of microwaves (MW) into the cooking chamber (2) of the household microwave appliance (1), at least one microwave leakage radiation (LS) is monitored for the presence of angle-related repetitive fluctuations (Max1, Min, Max2), and if the absence of such fluctuations (Max1, Min, Max2) is identified, at least one action is triggered. A household microwave appliance (1) comprises: a cooking chamber (2), a microwave generator (5) for generating microwaves (MW), at least one rotatable microwave distribution device (8) for changing the field distribution of microwaves (MW) fed into the cooking chamber (2), at least one leakage radiation measuring device (11) for measuring microwave leakage radiation (LS), and a data processing device (10) configured to perform the method. The invention can be particularly advantageously applied to microwave cooking appliances, especially ovens with microwave functionality.

In a method for detecting a standstill of a rotatable microwave distribution apparatus of a household microwave appliance, while microwaves are being supplied into a cooking compartment of the household microwave appliance, a microwave leakage radiation for angle-dependent recurring fluctuations is monitored and an action in the absence of such fluctuations being detected.

The present application relates to the technical field of nuclear power plant radiation monitoring, and particularly relates to a primary loop pressure boundary leakage radiation monitoring device and a monitoring method thereof. 18 F has a long half-life, positron annihilation and other characteristics, and the gamma-gamma digital coincidence measurement technology is applied to the primary loop pressure boundary leakage monitoring, quantitative monitoring of the primary loop pressure boundary leakage rate is realized, the anti-interference capability of the system is improved, the detection lower limit of the system is reduced, and the system is miniaturized to a certain extent.

A method for identifying arcing within a processing chamber (2) of a household microwave appliance (1) during a microwave processing procedure, wherein the setpoint of at least one microwave operating parameter is varied during the method, wherein a measured value (LM) of leakage radiation is measured multiple times sequentially at the same setpoint of the at least one microwave operating parameter during the microwave processing procedure, and an arcing is identified when the fluctuation range (LMS) of the measured value (LM) measured at the same setpoint reaches or exceeds a predetermined fluctuation range (LMS thr). A household microwave appliance (1) has a microwave generator (5) for generating microwaves, a processing chamber (2) capable of being loaded by the generated microwaves, microwave detection devices (10, 11) for measuring microwave leakage radiation escaping from the processing chamber (2), and a data processing device (10) for identifying arcing by evaluating the microwave leakage radiation (LM) measured by the microwave leakage detection devices (10, 11), wherein the household microwave appliance (1) is configured to perform the method. This invention can be particularly advantageously applied to stand-alone microwave devices and ovens with microwave functionality, especially when the microwave detection device is equipped with a sniffing circuit.

This invention discloses a surface wave antenna system integrated into a tilted vehicle windshield, comprising a stacked glass substrate, a parallel plate waveguide, a TEM surface wave excitation structure, a TM0 mode conversion and radiation structure, and a TE0 mode excitation and radiation structure. The TEM mode surface wave is shaped and propagated using a gradient-profile parallel plate waveguide, and TM0 mode conversion and leakage radiation are achieved at a single-sided ground interface. Simultaneously, the reverse current coupling between the upper and lower metal conductors excites large-angle TE0 mode surface wave propagation and radiation in the azimuth plane. This invention achieves wide-angle radiation coverage in both the elevation and azimuth planes, and requires no interconnecting vias, making it suitable for integration into vehicle windshields and application in high-frequency communication scenarios such as V2X.