Abstract: An NMR imaging method and apparatus according to the present invention which enables a reduction in the scanning time without lowering the contrast resolving power and the spatial resolving power is arranged such that data which belongs to a relatively low spatial frequency region is collected by an ordinary scanning method, while data which belongs to a relatively high spatial frequency region is collected by a scanning method which enables data to be collected at a relatively high frequency, and reconstruction of an image is effected on the basis of data synthesized from data collected by these two methods.

Abstract: An apparatus and method for achieving variable observations angles by a single transducer rotationally and pivotally mounted with a housing; and for utilizing the variable angle transducer to detect and trace and distance of unseen objects within a casing from the transducer by moving the transducer within its housing which is held stationary against the casing; and for determining the angle of observation between the transducer and the observed object; and thereby accurately determining the relative position and orientation of the object within the casing.

Abstract: A method of obtaining spatially localized spectroscopic signals by using RF pulse sequences in the presence or gradient fields to generate stimulated echoes.

Abstract: A coupling for vibration testing comprises a pair of connecting links to be attached to a shaker head and to a driven fixture, respectively. Each of these has an axial passage through it and a convex spherical distal bearing surface. These bearing surfaces face each other. A center element has an axial passage through it and has opposite concave spherical bearing surfaces that face against the convex spherical bearing surfaces of the two connecting links. A low-friction coating or layer, i.e., fiber-reinforced PTFE, is applied to the convex bearing surfaces of the connecting links and provides a low-friction sliding surface against the mating surfaces of the center element. A preload bolt extends through the axial passages of the device and exerts a compressive axial preloading stress which exceeds the maximum vibrational force likely to be encountered.

Abstract: Disclosed in a nuclear magnetic resonance (NMR) based inspection apparatus using an SQUID flux meter for detecting a small NMR signal, in which a receiving coil for receiving the NMR signal from an object is connected to a mixer, which mixes a reference high-frequency signal with the NMR signal so that the NMR signal is reduced to a low-frequency signal having a differential component of frequencies of both signals, and the low-frequency signal is applied to the input coil of the SQUID flux meter so that it is converted into a voltage signal. The mixer circuit includes Schottky diodes operative at a liquid helium temperature or Josephson junctions, and the portions of apparatus from the reception coil up to the SQUID flux meter are operated in a superconductive state at a liquid helium temperature.

Abstract: Magnetic resonance imaging apparatus having a structure with an opening adapted to receive an object to be imaged. An object platform is provided which is sized so that it can be moved into the opening in the magnet structure. Structure is provided for supporting the platform and for moving the platform along x, y and z axes.

Abstract: A method for detecting faults or defects in moving machine parts wherein mechanical vibrations produced by a fault or defect are converted into an electrical signal from which the condition of the machine part is obtained. For converting the mechanical vibrations into an electrical signal, an acoustic-emission transducer with wide bandwidth is used. A frequency range in the electrical signal is selected where the half wavelength is smaller than the smallest linear dimension of the cross section of the transducer face which is in contact with the machine part.

Abstract: A method and apparatus for providing dialling intervals in dialling sequences indirectly dialled by a register in which such sequences are stored, such intervals being in accordance with the dialling intervals produced by a user during direct dialling of such sequences. Direct dialled subscriber numbers which include a dialling interval after at least one digit therein, such as for line access, are stored in a reference memory along with such interval. Upon an indirect dialling of such sequence from a redial or abbreviated dialling register, a microprocessor in the telephone set compares such sequence digit by digit with sequences stored in the reference memory, and if there is a match inserts in the dialled sequence the dialling interval in the matching stored sequence.

Abstract: A mobile device for testing an axle-mounted roller bearing of a railcar to determine possible defects in the bearing. A movable base plate has an electric motor, a drive roller, a driven roller, and a plurality of leveling jacks mounted thereon. The motor actuates the driver roller and the leveling jacks raise the base plate to move the drive roller and driven roller into contacting engagement with the outer race of the roller bearing. The outer race of the bearing is rotated by the drive roller at a predetermined rate. Shock pulses of energy also known as an acoustic emission, are emitted by defects in the bearing. A probe which senses such emissions is connected by a cable to a monitoring instrument. The probe is placed on a test point having direct metallic contact with the bearing, whereby the monitoring instrument will measure the type and magnitude of shock pulses, if any, emanating from the bearing. These readings are used to determine the type and extent of possible defects present in the bearing.

Abstract: An automatic underwater acoustic impedance measuring apparatus is instrumented with transducers whose outputs are led to a computer for the automatic measurement of acoustic impedance. One hydrophone is positioned so that it senses the incident and reflected signals to compute reflection factor. A second hydrophone is positioned at the face of the sample material so that it senses the incident and reflected waves from which it is possible to compute the phase angle. Acoustic impedance is obtained from the phase angle and reflection factor, computed and printed out in real time and automatically swept through a frequency range of interest.

Abstract: An apparatus and method for decoding ringing signals on a party telephone line coupled to the telephone line and a telephone instrument, according to the polarity of a d.c. voltage level present across the telephone line upon which ringing signals are superimposed and according to the grounded state of the telephone line. The apparatus comprises a discrimination circuit which supplies a selected one of the ringing signals to the telephone instrument via a ringing signal path to actuate the ringer of the telephone instrument. The apparatus further comprises a ringing signal rectification circuit connected to the telephone instrument via a voice signal path for preventing the ringing signal present on the telephone line from activating a ringer of the telephone instrument via the voice signal path. A switching circuit selectively connects the telephone instrument to the ringing signal path and the voice signal path.

Abstract: An electrical conductor forming a grid only partially circumferentially surrounds the path of the outer portion of a rotatable member. The member has a magnet coupled thereto for influencing the grid to produce a signal indicative of vibration of the member whenever the magnet is within a predetermined distance of the grid. During the interval that the magnet does not influence the grid, a synthesis signal, indicative of vibration of the member during the previous influence portion of the revolution, is generated. The influence signal and the synthesis signal may be provided to processing apparatus for obtaining vibration information. Providing both an influence signal and a synthesis signal substantially simplifies processing apparatus that would otherwise be needed should only an essentially null signal be available during the interval in which the magnet does not influence the grid.

Abstract: A quadrature detection MRI radio frequency coil includes plural axially-extending conductive legs. At least two of the legs include breaks in conductivity at their mid-point with circumferentially extending inner-bridge conductors connected thereacross to which RF input/output feed connections are conveniently made so as to achieve a center fed coil structure, open at both ends. Other axially-extending legs may also include conductive breaks with capacitive coupling thereacross and circumferentially extending outer-bridges between the outer or distal ends of the legs may also include breaks in conductivity with capacitive coupling thereacross.

Abstract: Techniques are disclosed for producing improved ultrasonic cross-sectional images of a body subject to a number of consecutive and at least partly overlapping scans by the pulse echo method to produce digital image signals corresponding to the received echoes. The illustrated systems includes an ultrasonic transducer scanner energized by a transmitter, and a receiver configuration which processes the received echo signals for display on a TV monitor. To reduce the image-quality-limiting noise while retaining a satisfactory representation of moving parts in the zone under examination, image signals corresponding to corresponding scanning dots of consecutive scans are combined in the receiver circuit which utilizes time-discrete non-linear filtering with filter coefficients which vary as a function of the filter input signal. This arrangement and the related process produce improved images.

Abstract: Apparatus and method for vibrating a specimen in multiple directions. Exciters for vibration in the X and Y orthogonal directions are coupled to shafts extending through orifices in the hollow vibrator to X and Y control plates on the inside of the vibrator in contact with the interior walls thereof to move the vibrator in X and Y directions. A Z-axis exciter is coupled to the base of the vibrator for moving it in the Z-axis direction. The orifices for the X and Y-axis exciter shafts are sufficiently large to allow Z-axis movement of the vibrator without affecting the motions of the X and Y shafts.

Abstract: A selective ringing circuit for a telephone line includes a rectifier which is normally connected to the telephone line for rectifying the AC ringing and other signals. The rectified ringing signals will not activate the ringing circuit of the telephone equipment, because a capacitor in the ringing circuit is charged and will not pass current therethrough in response to the DC signal. The selective ringing circuit includes a switch-selective signal-detecting arrangement by which a predetermined one of the ringing signals is detected and is used as an activation signal, while the other ringing signals are rejected. The activation signal activates an electrical connecting device which, when activated, electrically bypasses the rectifier and directly electrically connects the predetermined selected ringing signal to the telephone equipment. An automatic number identification circuit includes a transistor switch which connects a predetermined ground resistance to the telephone line.

Abstract: A modular, high density cross-connect frame specifically adapted for central office application and forming a centralized distributing frame intended for patch and cross-connect circuits for digital equipment. The frame is dual-sided, with the patching and testing administration entirely on one side confined to an area readily manually and visually accessible to service personnel, with cross-connect administration confined to the opposite side. Internal connections are made using a vertically oriented cabling plane disposed between the two sides of the frame using a relatively few number of cables each having a large number of individual connectors which interconnect a first set of connector blocks with corresponding jack frame elements. A second plurality of connector blocks is disposed immediately opposite the jack frame elements, and relatively short length connectors are required to interconnect the jack frames with the second plurality of blocks.

Abstract: A microprocessor-based telephone set includes a telephone number memory, a number indicator, an abbreviated number scanning switch and associated control circuit, in addition to a push-button dial and a hook switch as equipped in the usual telephone set. Telephone numbers are preset in correspondence to abbreviated numbers, so that a telephone number is dialed automatically by simply specifying a corresponding abbreviated number using the scanning switch and indicator. By provision of an FM transceiver within the handset and a separate relay unit for establishing radio communication with the base telephone station, a mobile telephone system is configured.

Abstract: Full duplex local intercom circuit arrangements are provided for telephone station instruments within a local network. Each instrument includes an FM receiver and an FM transmitter. If two subscriber telephone paths are provided, switches are also provided to reverse the connection of the paths of e.g. the calling party station relative to called party stations. The switches may be manual or automatic. If a single subscriber telephone path is provided, alternative carrier frequencies are selectively generated, with the calling party receive and transmit frequencies being reversed for the called party frequencies, either automatically, or manually. In all arrangements, the establishment of a normal telephone circuit through the central office over the subscriber line(s) has no effect on intercom communications, and vice versa.

Abstract: An NMR spectroscopy method monitors a component of a sample, the component having two resonances in coupled together different spectral regions. The first resonance lies in a region including a resonance of a second component of a sample while the second resonance lies in a spectral region including a resonance of a third component of the sample. Two spin-echo pulse sequences each consisting of pulses of a predetermined frequency are applied, the spin-echo resonance spectra together being used to obtain the second resonance of the first component with the resonance of the third component suppressed.