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| Number | Title | Issue Date |
| 4297600 | Multipath Raman cell for wavelength conversion The wavelength of an optical pump beam is down converted to a longer wavelength in a Raman active gaseous medium by stimulated Raman scattering. The Raman active gaseous medium is contained in the space between a pair of optical reflectors of an optical r... | 10/27/1981 |
| 4263551 | Method and apparatus for identifying conductive objects by monitoring the true resistive component of impedance change in a coil system caused by the object The type of conductor, its property, and if a metal, its type and cross-sectional area can be obtained from measurements made at different frequencies for the amount of unbalance created in a previously balanced stable coil detection system. The true resi... | 04/21/1981 |
| 4254348 | Tunable ultra-violet generator for use in the isotope separation of deuterium The frequency of the output beam of a high power krypton fluoride laser is shifted by a plurality of Raman cells arranged successively in the path of the laser beams. These cells each contain a gas selected from the following gases: H2, HD, D | 03/03/1981 |
| 4249104 | Self shift type gas discharge panel A self shift type gas discharge panel in which pluralities of buses are respectively provided on a pair of substrates disposed opposite each other, electrodes are respectively connected to the buses and shift channels are set up in row and column directio... | 02/03/1981 |
| 4249102 | Halogen-metal vapor discharge lamp To increase operating temperature, and hence vapor pressure, the arc tube ose to the arc, typically an inner arc tube, is at least partially frosted. The outer bulb which surrounds the inner arc tube may also be frosted. The lamps have low color temperatu... | 02/03/1981 |
| 4245171 | Device for producing high-powered radiation employing stimulated Raman scattering in an off-axis path between a pair of spherical mirrors A device is disclosed for producing intense 16 micron radiation in which stimulated rotational Raman scattering takes place in parahydrogen on an off-axis path between a pair of spherical mirrors.... | 01/13/1981 |
| 4243939 | Determining paramagnetic additive content of a base paramagnetic material containing ferromagnetic impurity Method and apparatus for the nondestructive determination of the amount and quantitative distribution of a paramagnetic additive such as gadolinia in nuclear fuel elements. Changes in paramagnetic susceptibility of the material in the element are detected... | 01/06/1981 |
| 4243881 | Time-resolved infrared spectral photography An intense broadband continuum light pulse of uniform spectral intensity and short time duration is generated. This continuum pulse is then downconverted in frequency to a region of interest, preferably in the infrared region, by applying it as a pump pul... | 01/06/1981 |
| 4239995 | Metal vapor Raman frequency shifter Shifted Raman radiation for an all-hot Raman discharge cell is produced by external laser pumping of a metal halide medium in the cell during an afterglow period following dissociation of the metal halide medium into metal atoms and before recombination t... | 12/16/1980 |
| 4237416 | Apparatus for counting and sizing particles suspended in a liquid electrolyte An apparatus for counting and sizing particles suspended in a liquid electrolyte, having first and second vessels for first liquid electrolyte having particles to be counted and sized suspended therein; and for particle-free second liquid electrolyte, res... | 12/02/1980 |
| 4233530 | Elastic surface wave device An elastic surface wave device, especially amplifier which includes input and output means for electrical signals provided so as to be spaced on a surface of a piezoelectric material which composes a laminate in combination with a semiconductor, and an el... | 11/11/1980 |
| 4233537 | Multicusp plasma containment apparatus It has been discovered that plasma containment by a chamber having multi-pole magnetic cusp reflecting walls in combination with electronic injection for electrostatic containment provides the means for generating magnetic field free quiescent plasmas for... | 11/11/1980 |
| 4229695 | Rotational speed transducer having greater low speed discrimination A digital transducer for rotary shaft speed has a resolution which varies automatically with shaft speed. A wheel, keyed to the shaft, is partitioned into plural sectors by angularly spaced notches, the angular spacing between successive notches increasin... | 10/21/1980 |
| 4224577 | Multistaged stokes injected Raman capillary waveguide amplifier A multistaged Stokes injected Raman capillary waveguide amplifier for providing a high gain Stokes output signal. The amplifier uses a plurality of optically coupled capillary waveguide amplifiers and one or more regenerative amplifiers to increase Stokes... | 09/23/1980 |
| 4223300 | Electro mechanical position indicator using relatively moveable coils An electromechanical positioner indicator is provided which comprises first and second relatively movable parts, the first part including two oppositely facing surfaces which are everywhere equidistant and the second part including two surfaces which are ... | 09/16/1980 |
| 4222011 | Stokes injected Raman capillary waveguide amplifier A device for producing stimulated Raman scattering of CO2 laser radiation by rotational states in a diatomic molecular gas utilizing a Stokes injection signal. The system utilizes a cryogenically cooled waveguide for extending focal interaction... | 09/09/1980 |
| 4221981 | Device for frequency conversion of coherent light A device for converting the frequency of coherent light from a prescribed wavelength range characterized by utilizing at least one crystal consisting of a nonlinear optical material. In order to obtain phase adjustment or phase matching, the device of the... | 09/09/1980 |
| 4219772 | Apparatus for nondestructive testing of small blind bores utilizing the dry magnetic particle method A pair of electrical prods along with a powder supply gun are incorporated in a single portable frame member which is easily insertable into a relatively small blind bore; prod tension against the bore wall is adjustable by varying spring plunger tension;... | 08/26/1980 |
| 4219757 | Gas discharge lamp A gas discharge lamp having a glass tube with preformed sintered glass bodies sealed to each end with each body carrying at least one connector pin for an electrode so that at least one electrode is disposed and supported adjacent each end of the discharg... | 08/26/1980 |
| 4219774 | Automatic eddy current surface probe for fastener holes An eddy current flaw detector is held in a mounting block by a spring bias, the mounting block is selectively rotatable about a shank member for varying the radius of the detector as the shank rotates about a pivot point, turned by an electric drive mecha... | 08/26/1980 |
| 4218652 | Apparatus for measuring the intensity and direction of external magnetic fields including power supply and recording units having respective semi-conductor devices A device for measuring the intensity and direction of external magnetic fields comprising a differential ferroprobe, a recording unit and a unit for feeding field windings of the ferroprobe, the latter unit including a thyristor, a capacitor one terminal ... | 08/19/1980 |
| 4218651 | Apparatus for detecting longitudinal and transverse imperfections in elongated ferrous workpieces Apparatus for detecting defects such as fissures in the ferrous metal of elongated workpieces such as pipe may take the form of wall thickness and material continuity inspection apparatus that is located at an inspection site, with the inspection site bei... | 08/19/1980 |
| 4218628 | Vacuum ultraviolet and x-ray light source and method and short wavelength laser pumped by said light source A vacuum ultraviolet and x-ray light source based on spontaneous anti-Stokes scattering from atomic population stored in a metastable level is described. The source has a maximum brightness, attained as the media approaches two-photon opacity, equal to th... | 08/19/1980 |
| 4217542 | Self inverting gauging system A self inverting gauging system for such parameters as capacitively sensed distance or inductively sensed resistivity in which the sensor provides an output inversely varying with the dimension of interest. The gauge typically includes a dual slope integr... | 08/12/1980 |
| 4217548 | Flaw detector for pipe employing magnets located outside the pipe and detector mounted inside and movable along the pipe with the magnets A detector for magnetically detecting flaws on the inner surface of a pipe of magnetizable material comprises a magnetizing assembly having exciting magnets and movable longitudinally along the interior of the pipe and a detecting assembly movable longitu... | 08/12/1980 |
| 4215310 | Magnetic testing method and apparatus having provision for eliminating inaccuracies caused by gaps between probe and test piece A method and apparatus for electromagnetic testing of magnetic and/or electrically conductive materials. The apparatus includes the usual test probe which carries excitation and pickup coils and is placed against a test piece of magnetic and/or electrical... | 07/29/1980 |
| 4214201 | Integrated circuit testing probe Multi-tipped probe for testing integrated circuit elements, featuring, in various aspects, contact elements each resiliently biased in a rest position with a portion of itself spaced from a support and movable to an operating position against the support,... | 07/22/1980 |
| 4213089 | Variable scale readout for multi-meter use This invention provides an apparatus for adjusting the scale and range of D'Arsonval pointer-type meters providing an uncluttered accurate readout particularly adapted for compact hand-held meters. Display wheels imprinted with numerals for a plurality of... | 07/15/1980 |
| 4213060 | Tunable infrared source employing Raman mixing A tunable source of infrared radiation is obtained by irradiating an assemblage of Raman active gaseous atoms or molecules with a high intensity pumping beam of coherent radiation at a pump frequency ωp to stimulate the generation of Stokes wa... | 07/15/1980 |
| 4213085 | Phase inversion test device A device for testing phase inversion of a circuit includes a signal generator having an assymetrically shaped positive phased test signal output electrically connected through a buffer circuit to the input of the circuit under test. A differentiator circu... | 07/15/1980 |
| 4213088 | Voltage measuring circuit A voltage indicating meter is connected between the outputs of two high impedance operational amplifiers, the first of which receives an input signal to be measured through a range setting resistance dividing network and having a gain which can be set to ... | 07/15/1980 |
| 4211970 | Apparatus for determining the water content of isotropic materials The water content of electrically non-conductive powders, granulates, pastes and fibrous materials may be measured on the basis of microwave absorption. A frequency-modulated microwave oscillator supplies a closed multimode measuring resonator charged wit... | 07/08/1980 |
| 4211973 | Apparatus for detecting faults to be occurred or initially existing in a running electric rotary machine Apparatus for detecting possible changes or variations in the dimension of an air gap of a running electric rotary machine during operation thereof. Detector coils are each accommodated within respective slots formed in the stator core of the machine, the... | 07/08/1980 |
| 4210865 | Position sensor of linearly moving bodies Disclosure is made of a position sensor comprising a plurality of inductance coils with open magnetic circuits. One of the coils has two pairs of poles. The position sensor further includes a shunting element designed for movement along the axis of the co... | 07/01/1980 |
| 4210866 | Linearizing circuit for a non-destructive testing instrument having a digital display A linearizing circuit is provided for a non-destructive testing instrument having circuit means developing a DC voltage having a non-linear relationship to units of measurement or of conductivity or some other characteristic measure. A plurality of linear... | 07/01/1980 |
| 4209740 | Detector for locating the interfacial boundary level between two liquids The level of the interfacial boundary between two liquids having different dielectric constants is located by means of a detector in which two parallel sectional members constitute external capacitor plates supported by a metallic base plate and in which ... | 06/24/1980 |
| 4209743 | Circuit arrangement for measuring currents at high potential In a circuit arrangement for measuring currents at high potential, a capacitor, charged in accordance with the current to be measured, is shunted by a light emitting diode which generates a light pulse sequence with a frequency proportional to the current... | 06/24/1980 |
| 4209744 | Eddy current device for automatically testing the quality of elongated electrically conductive objects by non-destructive techniques An automatic eddy current inspection system for discrimination of defects in elongated parts made of conducting materials comprises an alternating current generator connected in series to an amplitude selector via a differential encircling eddy-current tr... | 06/24/1980 |
| 4209745 | Interchangeable test head for loaded test member An interchangeable test head for a vacuum fixture for testing a loaded planar test member. The test head includes support means comprising a planar support surface. A platform is in opposed relation to the planar support surface and has a planar test memb... | 06/24/1980 |
| 4208627 | Alarm circuit to detect shorting of periodic signal source An alarm circuit to monitor a periodic signal source for an occurrence of a short-circuit condition detects the entry of the instantaneous periodic signal magnitude into a predefined window bounded by an upper and lower threshold. The duration of the entr... | 06/17/1980 |
