摘要:
A photoelectron microscope wherein a normal conductive coil is used to produce a divergent magnetic field to form an enlarged photoelectron image of a specimen to be examined. The coil is only momentarily energized by pulse current, and in synchronism with the energization of the coil and while the change of the resultant magnetic field with time is small, the radiation source is actuated to produce a radiation pulse so that the photoelectrons produced upon irradiation of a specimen with the pulse flies through the magnetic field so as to be received by an image forming device. The image forming device is operated in synchronism with and a predetermined variable period of time after the actuation of the radiation source thereby to obtain photoelectron images of the specimen of different energy levels. By skimming only those photoelectrons of low energy which are emitted close to the axis of the magnetic field, it is possible to obtain images of high resolution.
摘要:
By using the delay time incurred in image reproduction brought about by the convolution action of the phosphor in image converter tubes, time is obtained in which to turn off the reproduction of the image or to lower the reproduction intensity so that the intensity of the oncoming image will not damage a camera tube or overexpose photographic film. Conversely, time may be achieved in which to turn the image on, likewise to a camera tube or photographic film, or reproducing or recording a fastacting phenomenon such as a lightning flash or bomb burst without the necessity of wasteful continuous exposure in order to ''''catch'''' the desired image.
摘要:
An integrated LIDAR receiver includes a single detection element to provide both imaging and ranging functions. The single detection element includes an opaque photocathode, a microchannel plate (MCP) electron multiplier, and a phosphor coated anode covered with a metalized layer. The metalized layer on the phosphor anode allows electrons striking the anode to be detected as a prompt electrical current. The prompt electrical current is detected through a transformer that couples the anode to a power supply. The power supply biases the anode relative to the MCP and photocathode such that the MCP is grounded. The use of a transformer allows the prompt anode current to be detected without having to ground the anode, thereby simplifying the power supply circuitry. The detection of the prompt electrical current provides a first output signal useful for ranging information. Visible light (photons) is also output from the anode in response to electrons striking the phosphor in the anode, and is used to provide an intensified image of a scene. The visible light may thereafter be detected by an imaging sensor, such as a CCD camera.
摘要:
An integrated LIDAR receiver includes a single detection element to provide both imaging and ranging functions. The single detection element includes an opaque photocathode, a microchannel plate (MCP) electron multiplier, and a phosphor coated anode covered with a metalized layer. The metalized layer on the phosphor anode allows electrons striking the anode to be detected as a prompt electrical current and used as a first output signal to provide ranging information. Visible light (photons) is also output from the anode in response to electrons striking the phosphor in the anode, and is used to provide an intensified image of a scene. The visible light may thereafter be detected by an imaging sensor, such as a CCD camera. The phosphor anode is biased at ground potential. A transimpedance amplifier is coupled to the metalized layer on the phosphor anode and, with the anode being at ground potential, operates with a virtual null input.
摘要:
An optical or photon image is converted by a photocathode to an electron image. A semiconductor plate receives the electron image on a first side thereof. For an electronically controlled time, the image is integrated and stored in thousands of reversed biased PN junctions connected to micro-sized conductors, in the plate. An intensified image is then transferred from a second side of the plate, at an electronically controlled time, to an output plate where the intensified image may be viewed.
摘要:
A neutron reactant layer (220) is directly coated inside an aluminum substrate (200) of an incident window (20). A first scintillator layer (201) is formed inside the neutron reactant layer 220, and a photoelectric conversion layer (202) is formed inside the first scintillator layer (201). A neutron reactant layer (210) is composed of enriched boron carbide (10B4C), and generates α-rays from neutrons by a (n, α) reaction in enriched boron. The first scintillator layer (201) is light-emitted by this α-rays.
摘要:
Protection of a low level television camera tube used with an image intensifier tube is provided by a shutter and a current limiting element in series with the photocathode of the image intensifier tube to cause the electron image in the intensifier to defocus, thereby providing protection for the camera tube while the shutter is being closed. A current limiting element in series with the photocathode of the camera tube further aids in protecting the target of the camera tube by reducing the kinetic energy of photoelectrons produced in response to a light image from the intensifier. A photodetector responds to excessive illumination to cause a control circuit to close the shutter.