Abstract: A seismic source signal generator includes a mass, a primary accumulator and a secondary accumulator, the secondary accumulator having an internal volume smaller than an internal volume of the primary accumulator. A method for generating a signal using a seismic vibrator includes operating the seismic vibrator using hydraulic fluid, damping hydraulic pressure deviations in the hydraulic fluid using a first accumulator in hydraulic communication with the hydraulic fluid, and damping pressure deviations in the hydraulic fluid using a second accumulator in hydraulic communication with the hydraulic fluid, the second accumulator having an internal volume smaller than an internal volume of the first accumulator.

Abstract: A seismic source signal generator includes a mass, a primary accumulator and a secondary accumulator, the secondary accumulator having an internal volume smaller than an internal volume of the primary accumulator. A method for generating a signal using a seismic vibrator includes operating the seismic vibrator using hydraulic fluid, damping hydraulic pressure deviations in the hydraulic fluid using a first accumulator in hydraulic communication with the hydraulic fluid, and damping pressure deviations in the hydraulic fluid using a second accumulator in hydraulic communication with the hydraulic fluid, the second accumulator having an internal volume smaller than an internal volume of the first accumulator.

Abstract: A seismic source signal generator includes a mass, a primary accumulator and a secondary accumulator, the secondary accumulator having an internal volume smaller than an internal volume of the primary accumulator. A method for generating a signal using a seismic vibrator includes operating the seismic vibrator using hydraulic fluid, damping hydraulic pressure deviations in the hydraulic fluid using a first accumulator in hydraulic communication with the hydraulic fluid, and damping pressure deviations in the hydraulic fluid using a second accumulator in hydraulic communication with the hydraulic fluid, the second accumulator having an internal volume smaller than an internal volume of the first accumulator.

Abstract: A seismic source signal generator includes a mass, a primary accumulator and a secondary accumulator, the secondary accumulator having an internal volume smaller than an internal volume of the primary accumulator. A method for generating a signal using a seismic vibrator includes operating the seismic vibrator using hydraulic fluid, damping hydraulic pressure deviations in the hydraulic fluid using a first accumulator in hydraulic communication with the hydraulic fluid, and damping pressure deviations in the hydraulic fluid using a second accumulator in hydraulic communication with the hydraulic fluid, the second accumulator having an internal volume smaller than an internal volume of the first accumulator.

Abstract: The present invention provides a radiolucent patient treatment table top with a removable tip extension base that can be accurately and repeatably mounted at the end of a table top that is completely metal free in the area of interest for imaging and treatment. The table top is composed primarily of polymer composites reinforced with carbon fibers or other non-metallic fibers such as Kevlar®. The table top allows for accurately and repeatably mounting removable tip extension members, radiographic phantoms, immobilization devices, brachytherapy steppers, and other devices to the end and sides of the patient table top. The present invention further provides a method of adding a variety of useful accessories without introducing any permanent metal components in the imaging/treatment area of the table top.

Abstract: A compact, low profile splicing system for joining optical fibers produces durable, low transmission loss fusion splices. The system employs active optical techniques such as profile alignment or local injection and detection to achieve optimized alignment of the fibers prior to fusion. Light injected into one fiber is propagated across the interface to a second fiber. A detector senses the intensity of the injected light in the second fiber. After the relative position of the fibers is manipulated to maximize the transmitted intensity, the fibers are fusion spliced using an electric arc discharge. The accurate alignment achievable using the local injection and detection system to drive adaptive fiber positioning affords a method for reliably producing low loss splices. The present system is compact and low in profile, making it operable in cramped quarters with limited clearance to adjacent equipment and structures and with only a minimal amount of free fiber slack available.

Abstract: A compact, low profile splicing system for joining optical fibers produces durable, low transmission loss fusion splices. The system employs active optical techniques such as profile alignment or local injection and detection to achieve optimized alignment of the fibers prior to fusion. Light injected into one fiber is propagated across the interface to a second fiber. A detector senses the intensity of the injected light in the second fiber. After the relative position of the fibers is manipulated to maximize the transmitted intensity, the fibers are fusion spliced using an electric arc discharge. The accurate alignment achievable using the local injection and detection system to drive adaptive fiber positioning affords a method for reliably producing low loss splices. The present system is compact and low in profile, making it operable in cramped quarters with limited clearance to adjacent equipment and structures and with only a minimal amount of free fiber slack available.

Abstract: A splicing stage for fusion joining two optical fibers comprises an electric arc welding system, a clamping and fiber position adjustment system, and an optional imaging optical system. The stage is preferably incorporated in a compact, low profile, modular fusion splicing system that employs a local injection and detection system to optimally align and position the fibers before fusion. The system is rugged, portable, and capable of operating in an adverse environment. Compact and low in profile, the splicing stage and system are operable with minimal clearance to adjacent equipment and structures and with only a minimal amount of free fiber slack available. Simplicity of design and operation enable accurate alignment and reproducible formation of low transmission loss spliced joints.

Abstract: A compact, low profile splicing system for joining optical fibers produces durable, low transmission loss fusion splices. The system employs active optical techniques such as profile alignment or local injection and detection to achieve optimized alignment of the fibers prior to fusion. Light injected into one fiber is propagated across the interface to a second fiber. A detector senses the intensity of the injected light in the second fiber. After the relative position of the fibers is manipulated to maximize the transmitted intensity, the fibers are fusion spliced using an electric arc discharge. The accurate alignment achievable using the local injection and detection system to drive adaptive fiber positioning affords a method for reliably producing low splices. The present system is compact and low in profile, making it operable in cramped quarters with limited clearance to adjacent equipment and structures and with only a minimal amount of free fiber slack available.

Abstract: A patient support device with shoulder depression devices for accurately and repeatably positioning a patient on a treatment table. The patient support device includes a headrest frame and an adjustable shoulder depression device and optionally includes a torso positioning device and a buttock restraint device.

Abstract: A local injection and detection system assesses the attenuation of light propagating from a first optical fiber to a second optical fiber associated therewith. The system comprises a light injector, a light detector, a driver to energize a light source in the injector, and a receiver. Light from the light source is injected into the first optical fiber and propagates therethrough. A portion of the propagating light in the second fiber is extracted onto a light responsive element in the detector. The system is particularly adapted for use in a system for splicing optical fibers, the system minimizing the insertion loss of the joint by optimally aligning the fibers prior to fusing them. In addition, the insertion loss of a joint can be inferred by comparing light attenuation before and after the joint is fused. The present system is compact and low in profile, enabling it to be used with a fusion splicer that operates with minimal clearance to adjacent equipment and structures.

Abstract: A splicing stage for fusion joining two optical fibers comprises an electric arc welding system, a clamping and fiber position adjustment system, and an optional imaging optical system. The stage is preferably incorporated in a compact, low profile, modular fusion splicing system that employs a local injection and detection system to optimally align and position the fibers before fusion. The system is rugged, portable, and capable of operating in an adverse environment. Compact and low in profile, the splicing stage and system are operable with minimal clearance to adjacent equipment and structures and with only a minimal amount of free fiber slack available. Simplicity of design and operation enable accurate alignment and reproducible formation of low transmission loss spliced joints.

Abstract: A local injection and detection system assesses the attenuation of light propagating from a first optical fiber to a second optical fiber associated therewith. The system comprises a light injector, a light detector, a driver to energize a light source in the injector, and a receiver. Light from the light source is injected into the first optical fiber and propagates therethrough. A portion of the propagating light in the second fiber is extracted onto a light responsive element in the detector. The system is particularly adapted for use in a system for splicing optical fibers, the system minimizing the insertion loss of the joint by optimally aligning the fibers prior to fusing them. In addition, the insertion loss of a joint can be inferred by comparing light attenuation before and after the joint is fused.

Abstract: A compact, low profile splicing system for joining optical fibers produces durable, low transmission loss fusion splices. The system employs active optical techniques such as profile alignment or local injection and detection to achieve optimized alignment of the fibers prior to fusion. Light injected into one fiber is propagated across the interface to a second fiber. A detector senses the intensity of the injected light in the second fiber. After the relative position of the fibers is manipulated to maximize the transmitted intensity, the fibers are fusion spliced using an electric arc discharge. The accurate alignment achievable using the local injection and detection system to drive adaptive fiber positioning affords a method for reliably producing low loss splices. The present system is compact and low in profile, making it operable in cramped quarters with limited clearance to adjacent equipment and structures and with only a minimal amount of free fiber slack available.

Abstract: A patient support device with shoulder depression devices for accurately and repeatably positioning a patient on a treatment table. The patient support device includes a headrest frame and an adjustable shoulder depression device and optionally includes a torso positioning device and a buttock restraint device.

Abstract: A portable, adjustable and angling head immobilization device for accurately and repeatably positioning a patient's head.

Abstract: A digital array for capturing a radiogram. The array includes a generally flat base on which there is mounted with a plurality of shock absorbing mounts a rigid support plate. A radiation electronic detection panel is mounted on the rigid plate in a way that the panel "floats" over the base. Electronic circuitry associated with the radiation detection panel is connected thereto with flexible connectors. A cover, which is transparent to X-ray radiation and opaque to visible radiation, is attached to the base to form a light tight enclosure for the panel. The top cover inner surface opposite the front surface of the radiation detection panel, is spaced from the detection panel front surface, and the detection panel is also spaced from the side walls.

Abstract: An imaging apparatus having a drive roller in an imaging zone includes a guideplate assembly for controlling the velocity of a substrate. The assembly has a guideplate with the inlet end disposed adjacent to a dispensing magazine and the outlet end disposed adjacent to the imaging zone. The guideplate assembly has a pushing finger movable therealong, a velocity-controlling sidewall and a spring-loaded biasing member disposed along opposed edges of the guideplate. The biasing member urges an edge of the substrate into frictional contact against a portion of the sidewall directly opposite the member while the pushing finger simultaneously engages the substrate to propel the substrate at a predetermined controlled velocity toward the outlet end of the guideplate against the frictional force imposed on the substrate by the sidewall. The predetermined controlled velocity is at least ninety percent of the rotational speed of the drive roller.

Abstract: An apparatus for controlling make-up and addition of replenishment solution to a photographic processor, having one or more reservoirs and metering pumps for selecting make-up solution concentrates, and electronic controls for determining the volume of replenishment solution. Replenishment can be accomplished taking into consideration all of the operating variables such as film size, replenishment rate, and percent exposure, as well as the cumulative effect of any additions and aerial oxidation of the solution while not in use.