A stereomicroscope has a dark field illumination apparatus capable of irradiating a subject with the light from a light source at a high efficiency by providing an optical system through which regularly reflected light beams are overlapped with each other by an annular reflective member with less ununiformity of the illumination.

Disclosed is a dark field illumination apparatus which is capable of performing a dark field illumination which exhibits a sufficient brightness and a sufficiently suppressed unevenness in brightness. The apparatus comprises a shaping system for shaping a light beam from a light source into approximately parallel beam having a ring- shaped section; a fly-eye optical device for forming a plurality of light source images in the vicinity of its exit plane based on the approximately parallel beam, t...

Three means or methods for compensating for thermal noise, also referred to as dark signal, are utilized to enhance the accuracy of a monolithic diode array. A charge-coupled linear photodiode array is used in a camera to detect densities of any image projected or reflected onto the array. After conversion, voltage variations of one/one thousandth (1/1,000) volt in a ten volt range are significant to the measurement of densities. Therefore, extremely accurate control of thermal noise, which is g...

A method, system, and apparatus for providing reduced dark current in a linear accelerator includes a cavity having an input aperture and an output aperture, and a particle source coupled to the input aperture, the input aperture having a radius greater than a radius of the output aperture.

A disconnection mechanism for a dark current fuse provides a connecting terminal connecting the dark current fuse, a fuse block body receiving the connecting terminal, and a fuse holder slidably engaged with the fuse block body in a direction of connecting the dark current fuse, the fuse holder provides a cutaway opening exposing a head of the dark current fuse being therein, an engaging projection disposed at an opening edge of the cutaway opening for engaging the head, and a supporting wall po...

A glow-in-the-dark composition suitable for molding fishing lures and fishing accessories is disclosed that provides improved glowing capabilities. By combining a white powder (preferably baking soda or salt) with a plastic resin and further including phosphorescent substance, mineral oil, color concentrate, foaming agent and silicone, plastic fishing accessories are created with superior glowing capacity. Briefly exposing the fishing accessories to light will cause them to emit light for a subs...

A pressure-sensitive adhesive tape can be produced by photopolymerization and yet its pressure-sensitive adhesive layer can have a dark appearance when it contains a pigment or dye plus finely divided hydrophobic silica. As compared to a tape which is identical except for omission of the hydrophobic silica, the adhesive layer of the tape is substantially darker and usually of substantially more intense color. Furthermore, the tape exhibits better adhesive properties than do otherwise identical t...

A device for affecting an individual bit rate limitation for each of a plurality of wavelength channels propagating in an optical fiber is disclosed. In a particular embodiment, the device comprises a directional coupler which is inserted into the optical fiber link. A recirculation path for a fraction of the power propagating in the fiber link extends between an output of the coupler and an input of the coupler. Illustratively, the recirculation path includes a wavelength division demultiplexer...

A vial, level including such vial, and method of using such level are disclosed. The vial comprises a body having first and second ends, a midpoint, and interior and exterior surfaces, at least one marker ring connected with respect to the body, a bubble positioned in the cavity and defined by an interface, and first and second dark-colored bands circumscribing the cavity. The vial enhances the visibility of the bubble through the reflection of the first and second bands on the interface such th...

A method and system for improving the quality of an image in an electronic imaging system is disclosed. The method and system comprise capturing an image frame, capturing a compressed dark frame, decompressing a portion of the compressed dark frame and subtracting the decompressed portion of the compressed dark frame from a corresponding section of the image frame. The steps of decompressing a portion of the compressed dark frame and subtracting the decompressed portion from a corresponding sect...