Image acquisition device comprising a photocathode, converting an incident flux of photons into a flux of electrons, a sensor, and a processor. The device according to the invention comprises a matrix of elementary filters, each associated with at least one pixel of the sensor, the matrix being disposed upstream of the photocathode. The matrix comprises primary color filters, and transparent filters, termed panchromatic filters. The processor is configured to: calculate a quantity, termed a useful quantity (F), for determining whether at least one zone of the sensor is in conditions of weak or strong illumination, the useful quantity being representative of a mean surface flux of photons or of electrons which is detected on a set of panchromatic pixels of the sensor; forming, only if the zone is in conditions of strong illumination, an image of the zone on the basis of the primary color pixels of this zone.

A radiation imaging apparatus, comprising a sensor panel in which a plurality of sensors configured to detect radiation are arrayed, a first circuit board that is arranged on the sensor panel and includes a circuit configured to read out a signal from each sensor, and a second circuit board that is arranged on the first circuit board and includes a circuit configured to read out a signal from each sensor, and whose radiant noise generation amount at a driving time of the circuit is larger than a radiant noise generation amount at a driving time of the circuit of the first circuit board, wherein the first circuit board is arranged between the sensor panel and the second circuit board.

The present invention improves sensitivity of the ultraviolet band of a photoelectric surface. A photoelectric surface includes a window material that transmits ultraviolet rays, a conductive film that is formed on the window material and has conductivity, an intermediate film 4 that is formed on the conductive film and is formed of MgF.sub.2, and a photoelectric conversion film that is formed on the intermediate film 4 and is formed of CsTe. Since the photoelectric surface includes the intermediate film 4 formed of MgF.sub.2, the sensitivity of the ultraviolet band is improved.

The present invention improves sensitivity of the ultraviolet band of a photoelectric surface. A photoelectric surface includes a window material that transmits ultraviolet rays, a conductive film that is formed on the window material and has conductivity, an intermediate film 4 that is formed on the conductive film and is formed of MgF.sub.2, and a photoelectric conversion film that is formed on the intermediate film 4 and is formed of CsTe. Since the photoelectric surface includes the intermediate film 4 formed of MgF.sub.2, the sensitivity of the ultraviolet band is improved.

The present invention provides a sheath for a disposable dental direct imaging digital device. The sheath for a disposable dental direct imaging digital device includes a bag structure that is made up of an elastic material, and is also made up of a positioning device that is placed in an opening of the bag structure. A direct imaging digital device may be inserted into the sheath. A first housing segment that is in connection with the opening exists on one end of the bag structure. The other end of the first housing segment is in connection with a second housing segment. A tapered channel is formed from the opening of the first housing segment towards the second housing segment. A positioning device may close or shrink the opening, so as to prevent the direct imaging digital device from sliding out of the sheath. The direct imaging digital device may be inserted into the first housing segment, and then may be inserted into the second housing segment. Accordingly, the direct imaging digital device may be encapsulated and positioned by the second housing segment. In accordance with the present invention, the time of insertion the direct imaging digital device into the sheath may be shortened, and ease of use of the sheath with the direct imaging digital device may be enhanced. Moreover, the sheath of the present invention may be suitable for a direct imaging digital device of any size.

The disclosure relates to a grid-controlled X-ray source, a space X-ray communication system and a space X-ray communication method. The structure of the grid-controlled X-ray source is: one end of the filament is grounded and the other end is connected with the anode of a power supply, the thermionic cathode is located at the side of the filament and the emergence hole thereof faces the filament, the modulation grid is an electrode plate with a small hole which faces the emergence hole of the thermionic cathode, the electronic beam focusing electrode is located on the two sides of the small hole of the modulation grid to form a focusing channel facing the small hole, an electronic beam is focused by the electronic beam focusing electrode and then transmitted to the metallic target anode, wherein the transmitting surface of the metallic target anode faces the outlet of the focusing channel and the other surface is connected with the anode of the power supply, and the output window is located on an reflection path of the electronic beam which is from the metallic target anode. The disclosure solves the technical problems that the signal-to-noise ratio of communication is low, the error rate error rate of communication is high and the speed of communication is low when an X ray is used for implementing communication in the conventional art, and has the advantages of long communication distance and the low error rate of communication.

The disclosure relates to a grid-controlled X-ray source, a space X-ray communication system and a space X-ray communication method. The structure of the grid-controlled X-ray source is: one end of the filament is grounded and the other end is connected with the anode of a power supply, the thermionic cathode is located at the side of the filament and the emergence hole thereof faces the filament, the modulation grid is an electrode plate with a small hole which faces the emergence hole of the thermionic cathode, the electronic beam focusing electrode is located on the two sides of the small hole of the modulation grid to form a focusing channel facing the small hole, an electronic beam is focused by the electronic beam focusing electrode and then transmitted to the metallic target anode, wherein the transmitting surface of the metallic target anode faces the outlet of the focusing channel and the other surface is connected with the anode of the power supply, and the output window is located on an reflection path of the electronic beam which is from the metallic target anode. The disclosure solves the technical problems that the signal-to-noise ratio of communication is low, the error rate error rate of communication is high and the speed of communication is low when an X ray is used for implementing communication in the conventional art, and has the advantages of long communication distance and the low error rate of communication.

A method and high precision robot arm system are provided, for example, for X-ray nanodiffraction with an X-ray nanoprobe. The robot arm system includes duo-vertical-stages and a kinematic linkage system. A two-dimensional (2D) vertical plane ultra-precision robot arm supporting an X-ray detector provides positioning and manipulating of the X-ray detector. A vertical support for the 2D vertical plane robot arm includes spaced apart rails respectively engaging a first bearing structure and a second bearing structure carried by the 2D vertical plane robot arm.

A device (1), such as a detector or imaging device, for detecting ultraviolet light, is described. The device comprises a housing (4) for a chamber. Disposed within the housing is a charge carrier multiplier structure (9) comprising a dielectric sheet (10) having first and second opposite faces (11, 12) and having an array of holes (16) traversing the dielectric sheet between the first and second faces. The device includes a photocathode (13) supported on the first face of the dielectric sheet, having a work function of less than 6 eV. The device includes an anode (14) supported on the second face of the dielectric sheet.

A nightvision system includes an underlying device that provides output light in a first spectrum. A transparent optical device transmits light in the first spectrum from the underlying device through the transparent optical device. The transparent optical device includes an active area of a semiconductor chip. The active area includes active elements that cause the underlying device to detect light from the underlying device and transparent regions formed in the active area which are transparent to the light in the first spectrum to allow light in the first spectrum to pass through from the underlying device to a user. An image processor processes brightness maps produced using light detected by the first plurality of active elements. A tunable filter array coupled to the image processor filters at least a portion of the input light into the underlying device the underlying device based on brightness map processing.