51 results about "Beryllium window" patented technology

An X-ray generator uses a high electrical field generated when a hemimorphic crystal is heated or cooled. The crystal may be lithium niobate polarized in one direction. An X-ray target is placed inside a housing inside which a vacuum is maintained. A tungsten line containing thorium is placed between the crystal and the target. When the crystal is heated or cooled by a Pelletier element, an intense electrical field is generated around the crystal. Thermoelectrons released from the tungsten line accelerate as a result of the electrical field and collide with the X-ray target. The X-rays released at this time radiate through a beryllium window exteriorly of the housing. Intense X-rays are generated without using large scale equipment, such as a high voltage power source.

The invention discloses an in-situ battery accessory for an X-ray diffractometer, which comprises an upper top cover, a lower top cover, a central bolt, a beryllium window, a central cavity insulator, a negative electrode conductive seal, a central electrode, a central insulator, and a center bolt. The upper end is installed in the second threaded hole, the beryllium window is installed on the bottom of the second threaded hole, the beryllium window closes the second through hole, the center cavity insulator is installed in the through hole of the center bolt, and the center cavity insulator The upper end is in contact with the beryllium window, the negative electrode conductive seal is installed in the inner cavity of the central cavity insulator, the central insulator is fixedly installed on the first through hole, the central electrode is fixedly installed in the through hole of the central insulator, the upper end of the central electrode and Negative conductive seal connection. The device has the advantages of simple design, convenient use and good air sealing performance. The invention also discloses a heating device, a cooling device for the in-situ battery accessory of the X-ray diffractometer and a method for measuring lithium battery materials by using the in-situ battery accessory of the X-ray diffractometer.

The invention provides a polyimide / graphene X-ray window film and a preparation method thereof, relates to the material testing field of X-ray application, specifically relates to an X-ray window film and a preparation method thereof, and aims to solve the problem that a beryllium window prepared by the prior art cannot be used barely in air due to toxicity and difficult to process. The polyimide / graphene X-ray window film is prepared from graphene or oxidized graphene, a diamine monomer, a dianhydride monomer and an organic solvent. The preparation method of the polyimide / graphene X-ray window film comprises the following steps of: 1, premixing to obtain a premixed solution; 2, finally mixing to obtain a colloid to be coated; 3, coating and carrying out thermal imidization treatment to obtain the polyimide / graphene X-ray window film. The preparation method provided by the invention is mainly used for preparing the polyimide / graphene X-ray window film.

The invention relates to a seabed in situ X fluorescence measurement influence supervision method and device. The method includes the steps: building a Monte Carlo model, and simulating by the Monte Carlo model, to obtain the transmittance of a target element characteristic X ray under a beryllium window containing no impurities and having different thickness; according to the transmittance and with combination of beryllium window security theory analysis results, determining the optimal thickness of the beryllium window; simulating by the Monte Carlo model to respectively obtain the relationships between the target element characteristic X ray intensity and the target element content under conditions that the beryllium window thickness is the optimal thickness and the beryllium window contains impurities and conditions that the beryllium window thickness is the optimal thickness and the beryllium window contains no impurities, and comparing to obtain a comparison result; according tothe comparison result, judging whether the target element characteristic X ray intensity is affected when the beryllium window contains the impurities, and if the target element characteristic X ray intensity is affected when the beryllium window contains the impurities, correcting the target element characteristic X ray intensity when the beryllium window contains the impurities. The seabed in situ X fluorescence measurement influence supervision method provided by the embodiment of the invention effectively improves the accuracy of the measurement result.

The invention relates to an ultra-small interference type ultra-fast X-ray optical fiber detector. The detector is small in size, high in time resolution and strong in anti-electromagnetic interference. It mainly includes a sleeve, a metal beryllium window, a semiconductor ultrafast detection chip, a GRIN lens, a single-mode fiber and a fiber optic circulator; the sleeve is coaxially arranged with a GRIN lens, a semiconductor ultrafast detection chip and The metal beryllium window; the semiconductor ultrafast detection chip includes a semiconductor crystal and a reflective film coated on the front and rear surfaces of the semiconductor crystal respectively; two reflective films and the semiconductor crystal form a Fabry-Perot interference cavity; the single-mode optical fiber One end is a pigtail, and the pigtail is coaxially arranged on the GRIN lens, and the other end is connected to the second port of the fiber circulator; the first port of the fiber circulator is connected to an external tunable laser, and the fiber circulator The third port is connected with an external high-speed photoelectric detection system.