Abstract: An ion detector of simple construction and ease of operation comprising a space charge detector having a sensing electrode which detects the presence of a space charge by the charging of the sensing electrode, an evaluating circuit contained in a housing bearing the sensing electrode in the form of a surface electrode, and indicator means for indicating the presence or absence of ions depending on the charge on the sensing electrode.

Abstract: A meter is provided for measuring the total parts per million dissolved solids in an electrolytic solution. The sensor for the meter is located on an upright probe on the face of a mount which is rotatably attached to the casing of the meter. Such a construction enables the sensor to be immersed directly into a batch of the solution while the casing is maintained in an upright position to enable the scale on the upper surface thereof to be viewed by the operator. In addition, a recessed circular opening is provided on the face of the mount about the upright probe to enable the threaded ends of sample bottles to be attached thereto.

Abstract: A gas discharge lamp is disclosed which has a generally straight, tubular configuration and exhibits an approximately constant irradiation power along a greater portion of its length than previous lamps. This feature is achieved by forming the radiation body of the lamp into three sections along its length, a central sectors and two end sectors, wherein the central sector has different cross section than the two end sectors. In one embodiment, the central sector has a larger cross section than either of the end sectors.

Abstract: A bridge circuit of the transformer ratio-arm type includes a feedback circuit that is responsive to the output winding of the transformer and that is connected to produce in the transformer a compensating magnetomotive force in such direction as to reduce the unbalance between the magnetomotive forces produced by the two ratio windings. The compensating magnetomotive force may be produced in various ways, as for example, an output current from the feedback circuit may be applied to either one of the ratio windings of the transformer or to a further auxiliary winding of the transformer to generate the compensating magnetomotive force.

Abstract: A battery of series-connected storage cells is checked by:Measuring the transient elementary open-circuit voltage at the terminals of each storage cell;Comparing the said elementary voltages with the average transient voltage of the said storage cells (i.e. with the total transient open-circuit voltage divided by the number of storage cells). The battery is rejected if the difference between the said average transient voltage and one of the said elementary transient voltage becomes greater than a predetermined threshold.BACKGROUND OF THE INVENTION1. Field of the InventionThe present invention relates to a method and a device for checking a storage battery, more particularly a lead acid storage battery, charged and filled with electrolyte, this checking being effected in principle when the battery comes off the production line.2.

Abstract: An address counter sequentially addresses locations in a shift register or random access memory in which a waveform is stored in digital form to display the waveform on a cathode ray tube. Several magnification ranges are provided so that a selected portion of the waveform may be viewed in magnified form. A manually controllable position counter selects the portion of the magnified waveform for viewing in such a manner that the center of the portion will remain in the center of the cathode ray tube when the system is switched between magnification ranges. The position counter is an up-down counter which is driven by a same clock pulse generator which drives the address counter. A variable frequency divider is provided between the clock pulse generator and the position counter in such a manner that the position counter is driven at a convenient speed regardless of the magnification range.

Abstract: The specification discloses a first and a second rotary disk fixed together, each disk having a magnetic pole on its circumference, which disks rotate in the vicinity of a fixed magnetic head; the fixed magnetic head provides an electrical output signal each time a magnetic pole passes near it and, thus, said electrical output signal indicates a rotational angle and/or the number of rotations of said disk. Said magnetic head operates on a new principle developed from parametric excitation.

Abstract: A light pen sighting device for aligning the receptor of a light pen with an interactive display includes a support member in the form of a transparent plastic body having opposed parallel surfaces with a reticle in the form of points formed in the respective surfaces and a reflector disposed directly between and aligned with the reticle for reflecting light travelling along the axis of the reticle directly into the receptor of a light pen to which the device is mounted, thereby providing a parallex free light pen. An alternate embodiment utilizes fiber-optics for receiving and transmitting light to the receptor.

Abstract: Spurious voltage in the receiver coil of a nuclear magnetic resonance probe due to stray induction is cancelled out by inducing a voltage of correct phase and amplitude in a balance winding which is in RF coupling relationship to the receiver coil.

Abstract: Circuitry for developing a binary number proportional to the frequency of an input signal includes a first and second shift register and an adder. Timing control circuitry establishes a 16 bit computation period and also develops a fixed binary number. Circuit means are provided for interconnecting the adder and the firsrt register for increasing the content of the register by the fixed binary number once each cycle of the input signal and for reducing the content of the register by a fixed proportion each of the computation periods occurring during each cycle of the input signal. The content of the first register is transferred to the second or buffer register each cycle of the input signal and display means are provided for displaying the input frequency of a function as the binary number contained in the second register.

Abstract: A nuclear magnetic resonance apparatus incorporating a first trans-receiver coil, an internal lock coil, a decoupling coil, means for tuning said coils to desired frequencies, a first trans-receiving system for supplying the first trans-receiver coil with a first nuclear (such as .sup.1 H) resonance RF wave and detecting the first nuclear resonance F.I.D. signal, a second trans-receiving system for supplying the first trans-receiving coil with a second nuclear (such as .sup.13 C) resonance RF wave and detecting the second nuclear resonance F.I.D. (Free Inductance Decay) signal, a third trans-receiving system for supplying the internal lock coil with a third nuclear (such as .sup.2 D) resonance RF wave and detecting the third nuclear resonance signal, and a transmission system for supplying the first nuclear resonance RF wave to the decoupling coil, it being possible in said apparatus to observe different types of nucleus, viz; .sup.1 H and .sup.

Abstract: A signal responsive burst period timer and counter is provided for laser Doppler velocimetry, and the like, by bandpass filtering a signal burst and testing the filtered signal for exceeding a first level (V.sub.O -V.sub.L) and a second level (V.sub.O +V.sub.L), and subsequently crossing a reference level (V.sub.O) from the second level, and in that order, to qualify each cycle of the signal burst for timing and counting. A timing system checks the reference crossing of every qualified cycle, in accordance with the level crossing logic criteria described above, to determine that it occurs within a prescribed time interval as measured from the previous qualified reference crossing. When the sequence ends, either because a predetermined number of qualified cycles have been received or because the signal fails to meet one of the amplitude or time criteria described above, the burst period counter stops, the data is read out and the counter resets itself to process the next burst.

Abstract: An improvement in nuclear magnetic resonance spectrometer apparatus and one onsisting of a spectrometer which utilizes separate materials containing, respectively, sample and detector spin systems as opposed to one in which the sample and detector spins are contained in the same single material.

Abstract: A permanent magnet structure provides high fields (e.g., .about. 4500 Gauss) with excellent uniformity (e.g., .+-. 3 Gauss) over a moderately large volume of the gap (e.g., approximately 20 percent of the gap diameter and gap width). This is accomplished by grinding away a portion of the permanent magnet material at the center of each face of the gap to form a depression, deepest at the center of the face. The magnet may include means for varying the gap width and a modulating coil for low frequency minor variation of the magnetic field. The magnet structure is used in conjunction with a 12 GHz self-excited spin resonance cavity to form a compact, portable electron spin resonance spectrometer.

Abstract: A method for determining the expected consumption rate of graphite electrodes is disclosed. An electrical signal is applied to a number of electrodes to generate eddy currents therein which are sensed to provide eddy current values. The consumption rate of the electrodes in use in an electric arc metallurgical furnace are measured. A standard eddy current value (with respect to the measured consumption rates) is determined, for example, by plotting the eddy current values and measured consumption rates. Thereafter, eddy current values obtained from other electrodes are compared with the standard eddy current value to determine the expected consumption rate.

Abstract: The multiplet spectral structure produced by coupled gyromagnetic resonators, such as heteronuclear coupling, is resolved by inducing a train of transient free induction decay (FID) resonances of a first group of gyromagnetic bodies, such as carbon-13 nuclei coupled to a second group of gyromagnetic bodies, such as protons, and detecting the FID resonance. A decoupling r.f. magnetic field is applied to the second group during free induction decay resonance of the first group for decoupling the spins of the first and second groups during detection of resonance of the first group. The duration of the decoupling effect is changed from one successive free induction decay resonance to the next and the detected resonance data is stored as a function of the change in the decoupling effect.

Abstract: A method and system for making absolute measurements of coherent rf power is described. The method surmounts the primary shortcoming of the other existing methods in that it permits absolute measurement of power at all radio frequencies, whereas the other methods are inherently frequency limited, with the current upper limit being about 75 GHz. This major advantage stems from the fact that this method utilizes a direct comparison of the unknown rf power with a primary standard, whereas all other methods require a conversion of the power to heat before making the comparison.

Abstract: A series of input pulses are applied to one terminal of an electron tube having at least two electrodes. As a result of interelectrode capacitance, the input pulses produce output pulses at the other electrodes, the output pulses having amplitudes which are substantially less than those of the input pulses. Level detection means is used to detect interelectrode open and short circuits by measuring the amplitudes of the output pulses.

Abstract: A continuous automatic calibration system and fault detection method for analytical instruments of the kind used for measuring constituents of a fluid sample which system includes a memory for storing reference information, a comparator circuit for continuously comparing the instrument output to the stored reference information, and a sample-and-hold circuit charged positive or negative by the comparator, depending whether or not the instrument output exceeds the value of the reference information. The output of the sample-and-hold circuit in turn is coupled to the instrument continuously to adjust its output to correct value. Where the maximum allowed corrective range of the sample-and-hold circuit is exceeded by the signal from the comparator circuit beyond a predetermined time period, the system displays fault, warning the operator.

Abstract: A moving coil electrical meter mechanism has a substantially rectangular coil and a magnetic structure surrounding first, second and third sides of the coil and defining first, second and third magnetic flux filled air gaps containing magnetic fields so oriented that the forces exerted on the first, second and third sides of the coil are in the same direction. The rectangular coil is mounted to rotate under the influence of the magnetic fields around an axis adjacent to the fourth side of the coil, with the magnetic fields remaining orthogonal to the coil sides during rotation.