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Radiation monitoring apparatus
II
New Patents
4551235 UTILITY CONSERVATION IN HYDROGEN RECYCLE CONVERSION PROCESSES Don B Carson assigned to UOP Inc There is disclosed a system for measuring and controlling the concentration of hydrogen in hydrogen recycle processes used in oil refineries and petrochemical plants. The system is intended to reduce the amount of hydrogen and hydrocarbon vapor circulating in such systems, thus reducing the quantity of utilities needed to operate such systems. Specifically, there is a savings of compressor power and fuel required for heating. The system is dependent on the recognition that a decrease in cooling medium temperature results in an increase in hydrogen flow, which can be decreased to the minimum permissible without endangering catalyst activity and stability and product yield if hydrogen concentration is monitored, and that partial pressure is the key parameter.
ter the laser beam emerges from an optical resonator it is deflected by a mirror against a workpiece and focused on the surface thereon. An image-rotating means is disposed in the beam path after the deflection mirror, and has an odd number of fully reflective mirrors, but at least 3 such mirrors. The angle of rotation of the imagerotating means is electronically controllable in accordance with the direction of the path of the working movement. The image-rotating means and focusing system advantageously form a single component in which at least one of the mirrors of the image-rotating means focuses the laser beam onto the surface of the workpiece. Preferred is a laser having an unstable optical resonator with at least three fully reflective mirrors of cylindrical curvature, the mirrors whose planes of curvature are parallel to one another defining the optical resonator, and the third mirror, or every additional mirror, being concavely curved in a plane perpendicular with respect to the mirrors defining the resonator.
4551711 4551298 RADIATION MONITORING APPARATUS Norman P Goldstein, Stephen Lane assigned to Westinghouse Electric Corp The radioactivity of radioactive fluid is monitored, in the presence of background radiation, without interruption of radioactivity detection with two successive volumes of radioactive fluid, the background being eliminated by subtraction. Typically the intrinsic responses are in the ratio of two to one for such successive measurements, when the proper volumes have been selected.
4551608 MATERIAL WORKING APPARATUS Hans Opower, Krailling, Federal Republic Of Germany assigned to W C Heraeus GmbH High-power laser metalworking apparatus, especially one having a carbon dioxide laser. Af-
INFRARED-TYPE INTRUSION DETECTOR Shoichi Akiyama, Mikio Kondo, Tsu, Japan assigned to Matsushita Electric Works Ltd An infrared-type intrusion detector for monitoring the presence of a person is disclosed. The detector has a plurality of concave reflector segments for defining separate fields of view. Inflared radiation emanating from the person in any of the fields of view is collected and focused upon a single sensing element to produce a cautionary signal representative of such detection. Plane mirrors are introduced in an optical reflection system of the detector to reflect the radiation from the reflector segments upon the sensing element, such as to reduce the spacing or dimension required for the optical system along the optical axis of the sensing element, whereby the detector is allowed to be made compact in size. Further, the optical system of the detector includes a device for selectively interrupting one or more paths between the respective reflector segments and the sensing element, such that the detector can receive the infrared radiation only from the selected or desired fields of view and ignore it from the undesired fields depending upon certain operating condftions, enhancing detection reliability.
New Patents
4551235 UTILITY CONSERVATION IN HYDROGEN RECYCLE CONVERSION PROCESSES Don B Carson assigned to UOP Inc There is disclosed a system for measuring and controlling the concentration of hydrogen in hydrogen recycle processes used in oil refineries and petrochemical plants. The system is intended to reduce the amount of hydrogen and hydrocarbon vapor circulating in such systems, thus reducing the quantity of utilities needed to operate such systems. Specifically, there is a savings of compressor power and fuel required for heating. The system is dependent on the recognition that a decrease in cooling medium temperature results in an increase in hydrogen flow, which can be decreased to the minimum permissible without endangering catalyst activity and stability and product yield if hydrogen concentration is monitored, and that partial pressure is the key parameter.
ter the laser beam emerges from an optical resonator it is deflected by a mirror against a workpiece and focused on the surface thereon. An image-rotating means is disposed in the beam path after the deflection mirror, and has an odd number of fully reflective mirrors, but at least 3 such mirrors. The angle of rotation of the imagerotating means is electronically controllable in accordance with the direction of the path of the working movement. The image-rotating means and focusing system advantageously form a single component in which at least one of the mirrors of the image-rotating means focuses the laser beam onto the surface of the workpiece. Preferred is a laser having an unstable optical resonator with at least three fully reflective mirrors of cylindrical curvature, the mirrors whose planes of curvature are parallel to one another defining the optical resonator, and the third mirror, or every additional mirror, being concavely curved in a plane perpendicular with respect to the mirrors defining the resonator.
4551711 4551298 RADIATION MONITORING APPARATUS Norman P Goldstein, Stephen Lane assigned to Westinghouse Electric Corp The radioactivity of radioactive fluid is monitored, in the presence of background radiation, without interruption of radioactivity detection with two successive volumes of radioactive fluid, the background being eliminated by subtraction. Typically the intrinsic responses are in the ratio of two to one for such successive measurements, when the proper volumes have been selected.
4551608 MATERIAL WORKING APPARATUS Hans Opower, Krailling, Federal Republic Of Germany assigned to W C Heraeus GmbH High-power laser metalworking apparatus, especially one having a carbon dioxide laser. Af-
INFRARED-TYPE INTRUSION DETECTOR Shoichi Akiyama, Mikio Kondo, Tsu, Japan assigned to Matsushita Electric Works Ltd An infrared-type intrusion detector for monitoring the presence of a person is disclosed. The detector has a plurality of concave reflector segments for defining separate fields of view. Inflared radiation emanating from the person in any of the fields of view is collected and focused upon a single sensing element to produce a cautionary signal representative of such detection. Plane mirrors are introduced in an optical reflection system of the detector to reflect the radiation from the reflector segments upon the sensing element, such as to reduce the spacing or dimension required for the optical system along the optical axis of the sensing element, whereby the detector is allowed to be made compact in size. Further, the optical system of the detector includes a device for selectively interrupting one or more paths between the respective reflector segments and the sensing element, such that the detector can receive the infrared radiation only from the selected or desired fields of view and ignore it from the undesired fields depending upon certain operating condftions, enhancing detection reliability.