Abstract: Method of correcting the azimuth angle of a photometric ellipsometer in which accurate ellipsometric parameters .PSI. and .DELTA. can be simply and readily obtained by measuring by means of a suitable method the errors in the azimuth angle of a polarizer assembly or a polarizer and an analyzer system or an analyzer and subtracting the error value from the actually measured value.

Abstract: A radiology patient support system includes a single vertical pillar of rigid closed box construction in which the side walls form a continuous closed cross section which rigidly supports two vertically arranged longitudinal tracks with their lateral directions at a right angle. A vertically displaceable carriage also of rigid box construction, is provided with bearing rollers which respectively engage the tracks and effectively locate the carriage horizontally relative to the pillar. A patent support table top is mounted on the carriage.

Abstract: A flow cell for high performance chromatography, in which the measuring chamber is formed by a bore (12) in a plate (11) and the supply and discharge ducts are formed by bores (13, 14) in the plate (11) communicating with grooves (16, 18) in the plate surfaces (15, 17), the grooves being covered by transparent plates (19, 20) bonded on the plate surfaces, and thus forming closed ducts.

Abstract: The present invention constitutes a differential amplifier system (50) including a main differential amplifier (60) and a compensating differential amplifier (90) which are coupled together in a complementary manner to provide a composite output signal.The amplifiers are of similar construction but have different circuit component values. Each of the amplifiers is of the differential type and includes emitter-coupled transistors (62) and (64) or (92) and (94), a feedback resistor (66) or (96) connected between the emitter leads (78) and (80) or (108) and (110) of these transistors and a pair of constant-current sources (68) and (70) or (98) and (100) separately connected to different ones of the emitter leads of the transistors. The circuit values of the constant-current sources and feedback resistors in the two amplifiers are different and are adjusted to allow the output of the compensating amplifier to cancel primary nonlinearities in the output of the main amplifier.

Abstract: An improved linear amplifier circuit includes current mirror circuits that are cross connected in the collector circuits of input transistors for supplying proportional current to circuit nodes from which signal is derived for controlling the output stages. The states for supplying boost current to the circuit nodes are stabilized in quiescent condition to avoid delays commonly associated with the turning on of a non-conducting stage.

Abstract: Electrodes are provided in the vicinity of the switching region of a carrier injection type optical switch, and carriers are removed rapidly through these electrodes when the switch is turned OFF. As the result, a switching speed is increased.

Abstract: This is a one of the many differential multiplier circuits providing a fast selection of a one set of differential input signals from a multiplexity of differential input signals in which a plurality of differential input circuits coupled to differential outputs can be selectively prevented from being propagated to the differential outputs by activating one or more switching circuits coupled to the differential output circuits.

Abstract: There is disclosed a fabric pin table having a pin holder carried by a movable rack mounted below the table. Holes or slots are provided in the table's top so that pins can be inserted through the holes or slots and into the pin holder. The pin holder clamps the pins by means of a spring so that they are held tightly but are still removable.

Abstract: A low-pass filtering cell is disclosed. This cell uses a distributed capacitance resistive line having an intermediate tap to which a feedback capacitor is connected, the resistive line being connected to the input of an operational amplifier. The intermediate tap is positioned at one third of the length of the line to reduce the overall space factor of the cell to the minimum while, at the same time, obtaining the flattest possible response curve.

Abstract: A zero to one hundred and eight-degree active phase shifter for microwave frequencies contains a differential input amplifier having an inverting output (.beta.V) and a non-inverting output (.alpha.V) and a first (T.sub.11, T.sub.12) and a second (T.sub.13, T.sub.14) output stage of the push-pull type realized with MES-transistors and each comprising an inverting input and a non-inverting input. The inverting output (.beta.V) of the input amplifier controls the inverting input (T.sub.12) of the first output stage and the non-inverting input (T.sub.13) of the second output stage. The non-inverting output (.alpha.V) of the input amplifier controls the non-inverting input (T.sub.11) of the first output stage and the inverting input (T.sub.14) of the second output stage.

Abstract: The present invention relates to an universal clamping device with multi-purpose clamping surfaces, it is composed of a jaw and one or more jaw seats. Wherein the jaw comprises a plurality of vertical jaw seats and each of said jaw seat comprises a vertical curve wall and a horizontal bottom base, said vertical curve wall comprises an extension rib parallel to the bottom base, said horizontal bottom base comprises a piercing hole whch is relatively in the center of the extension rib. The jaw plate has various different vertical clamping surfaces, it comprises peripherally a ring groove corresponding to said extension rib and has a vertical bottom hole corresponding to the piercing hole of said jaw, the maximum radius of gyration of the jaw plate is smaller than the radius of the curve of vertical wall.

Abstract: An amplifier comprising a plurality of stacked current mirrors, each having an input and a common terminal, provides an output amplified current in response to receiving an input current at first and second inputs. A current source supplies a direct current to the input of the first one of the current mirrors while the input and the common terminal is also coupled to the first and second inputs of the amplifier. The common terminal of each preceding current mirror is coupled to the input of the next proceeding current mirror whereby the sum of the input and output currents of the preceding amplifier is sourced to the input of the proceeding current mirror. An output of the last one of the plurality of current mirrors is coupled to the output of the amplifier.

Abstract: A method and apparatus for automatically restoring the DC signal level of recorded servo information which has been electronically recovered from a rotating disk storage device has a high gain differential amplifier which is connected to sense the DC level of the signal relative to a reference potential, and generate an error current. The resultant current is integrated to generate a potential and corresponding current, which is then applied via a feedback loop to adjust the DC level of the input signal. DC restoration is performed without altering the bias conditions of the preceeding amplifier stages, and is not dependent on waveform symmetry.

Abstract: A high speed curved position sensitive porportional counter detector for use in x-ray diffraction, the detection of 5-20 keV photons and the like. The detector employs a planar anode assembly of a plurality of parallel metallic wires. This anode assembly is supported between two cathode planes, with at least one of these cathode planes having a serpentine resistive path in the form of a meander having legs generally perpendicular to the anode wires. This meander is produced by special microelectronic fabrication techniques whereby the meander "wire" fans outwardly at the cathode ends to produce the curved aspect of the detector, and the legs of the meander are small in cross-section and very closely spaced whereby a spatial resolution of about 50 .mu.m can be achieved. All of the other performance characteristics are about as good or better than conventional position sensitive proportional counter type detectors. Count rates of up to 40,000 counts per second with 0.5 .mu.s shaping time constants are achieved.

Abstract: A broad band, balanced microwave component, such as an amplifier, includes an input Lange coupler having a first center frequency and an output Lange coupler having a second center frequency. The center frequencies of the two Lange couplers are offset or the coupling is different so that at least one of the cross-over points of the input Lange coupler is offset in frequency from both the cross-over points of the output Lange coupler. The pair of Lange couplers so offset in frequency yields no more than one peak in gain which is readily equalized by single-ended amplifiers within the balanced amplifier.

Abstract: A method and apparatus for regulating a voltage controlled amplifier to operate within Class A and Class AB extremes generate a bias control signal from one or more signals in a system including the voltage controlled amplifier and applying the bias control signal to the voltage controlled amplifier to affect operation within the extremes.

Abstract: An optical element comprising: a substrate; an optical waveguide arranged on the substrate; and flat electrodes disposed asymmetrically about the optical waveguide. An electric field is applied through the flat electrodes to the substrate and the optical waveguide so that a refractive index of a portion of the substrate in the vicinity of the optical waveguide is varied to interrupt a light beam propagating through the optical waveguide. The optical modulation, optical switching or the like can be carried out by electrically controlling the difference between refractive indices of the optical waveguide and the substrate in the horizontal direction, so that the nonuniformity of the refractive index of the optical waveguide which causes some problems in conventional branching interference type optical modulator and directional optical coupler do not cause any problem. The optical element has a higher light extinction ratio and the output light is by far stabilized against the variation in temperature.

Abstract: The subject of the present invention consists of a method and an apparatus for measurement of the fluorescence relaxation period of the radiation of a fluorescent substance whose fluorescence relaxation period is a function of at least one physical parameter. The fluorescence radiation is fed back to the output radiation in a regulating circuit, whose regulating parameter is a parameter for the physical parameter. This is accomplished by advancing the fluorescence radiation to a photoelectric receiver whose output signals are supplied to a voltage controlled oscillator following phase-sensitive rectification and integration. The fluorescence radiation is alternately phase-sensitively rectified only during the relaxation phase. The total durations of the different rectification periods in the two directions are identical. The alternatingly rectified signals are integrated.

Abstract: The invention has the object of providing an optic contact, that is to say the positioning and fixing of a termination (5) of an optic fibre in a connection terminal (4). According to the invention: the termination is inserted in the terminal in a manner to allow the termination a transverse play in the terminal; an optic signal is axially injected (120,110) into the core of the fibre through the end face (6) of the termination; the signal returned through this same end face is detected (110,130,140) on a point of this latter corresponding to a predetermined reference axis; the termination is displaced transversely (210,220; 210',220') in the terminal with respect to the reference axis as far as a position at which the amplitude of detected signal (S.sub.W) is a maximum, so that this position corresponds to an alignment of the axis of the core of the fibre on this reference axis; the termination is fixed in this position in the terminal.

Abstract: Circuitry for producing an extremely linear frequency modulated audio carrier for use in the head end of a video signal distribution system, such as a cable television system. A reference oscillator operating at a relatively high frequency, such as the video carrier frequency, generates a signal which is divided down to a relatively low frequency. A voltage controlled oscillator operating at the relatively low frequency is used to frequency modulate the audio signal. After modulation, the audio carrier is upconverted utilizing a signal frequency which is also derived from the original reference frequency, thus providing a stable and linear frequency modulated audio carrier particularly suitable for transmission of stereo program audio.