Abstract: A rolling rotor motor/compressor has a stator/cylinder with an internal rotor/piston. The stator/cylinder and rotor/piston together define a chamber and a vane extends into this chamber when the device is compressor. The rotor/piston has a pair of axially extending shafts and a pair of counterweights coact with the shafts for balancing while permitting radial movement of the rotor/piston within the stator/cylinder. This permits unloading of the compressor such as when there is a liquid slug.

Abstract: An elastic bar member is coupled to an orbiting mass oscillator and the entire assembly is suspended from a cable or the like such that the bar member has freedom of lateral motion and is nakedly immersed in a slurry having particulate material contained therein such as a mineral ore reject from which metal has been extracted. The rotor of the orbiting mass oscillator is driven at a speed such as to generate cycloidal sonic energy in the bar preferably at a frequency such as to set up resonant standing wave vibration of the bar in a cycloidal quadrature pattern. The cycloidal vibrational energy tends to set the surrounding fluid material into a whirling rotation or rotary traveling wave which facilitates the agglomeration or coagulation of the particles in the material and enhances the settling operation to make for more complete separation of the particles from the liquid.

Abstract: An elastic bar member is clamped to an orbiting mass oscillator and the entire assembly is suspended from a cable or the like such that the bar member has freedom of lateral motion and is nakedly immersed in a leachant having a material contained therein such as a mineral ore from which metal is to be extracted. The rotor of the orbiting mass oscillator is driven at a speed such as to generate cycloidal sonic energy in the bar preferably at a frequency such as to set up resonant standing wave vibration of the bar in a cycloidal nutating pattern. The cycloidal vibrational energy tends to set the surrounding fluid material into a whirling rotation or rotary traveling wave which facilitates the mixing of the ore and leachant and enhances the leaching operation to make for more complete separation of the mineral from the ore.

Abstract: An alerting device for a paging receiver for generating vibration motion in the paging receiver housing. The alerting means comprises an electric motor, an eccentric weight, and a linking means. The electric motor is activated in response to an alert signal for rotating a driving shaft. The driving shaft is coupled to the eccentric weight by the linking means for rotating the eccentric weight. The linking means includes a driving means and a receiving means such that rotary motion is transmitted from the shaft to the eccentric weight while preventing transmission of vibration motion from the eccentric weight to the shaft. The eccentric weight is mechanically attached to the housing for transmitting the vibration motion directly to the housing without passing the vibration motion through the electric motor.

Abstract: A vibration generator (50) with a magnetically attractable mass (98) is loosely disposed within a substantially cylindrical cavity of a housing (54). An array of electromagnets (60-90) is circumferentially spaced around the housing cavity. The electromagnets (60-90) are sequentially energized in a predetermined sequence to magnetically attract the loosely disposed mass (98) toward an energized electromagnet, thereby causing the magnetically attractable mass (98) to orbit around the array of electromagnets, imparting centrifugal force to the housing (54) which in turn generates vibration energy.

Abstract: A vibration generator (50) is disclosed for generating vibration energy. A magnetically attractable mass (98) is loosely disposed within a substantially cylindrical cavity of a housing (54). An array of electromagnets (60-90) are circumferentially spaced around the housing cavity. The electromagnets (60-90) are sequentially energized in a predetermined sequence to magnetically attract the loosely disposed mass (98) toward an energized electromagnet thereby causing the magnetically attractable mass (98) to orbit around the array of electromagnets imparting centrifugal force to housing (54) which in turn generates vibration energy.

Abstract: An orbital vibratory mass is used for generating seismic signals and the like. An annular reaction mass is mounted on a crank by means of bearing. The reaction mass orbitally oscillates relative to the axis of the crank shaft without rotating. This reduces the internal forces created in the reaction mass by centrifugal force and enables less exotic, less expensive materials to be used in its construction.

Abstract: The invention relates to a drive mechanism which comprises a single-phase synchronous motor (5) for converting the rotation of the motor shaft (3) into a pulsating axial movement by means of an eccentric cam (25). The motor shaft (3) carries a coaxial cylindrical body (13) whose eccentric cam (25) co-operates with a piston rod. The drive-shaft system comprising the motor shaft and body is supported in a multiple bearing comprising a broad-area bearing (23) for the circumferential surface (21) of the cylindrical body (13) and a shaft bearing (19) for the shaft end (15) which projects from the body (13) at the end which is remote from the motor (5). The end portion (29) of the piston rod is guided so as to be axially slidable.

Abstract: A tree vibrator (8) includes an electric motor (14) disposed within a housing (15) mounted on tree (10) by band clamp (18). An adjustable eccentric weight assembly (24) is mounted on the rotary output shaft (26) of motor (14) to impart vibrations of a desired intensity on tree (10). Motor (14) is powered by battery assembly (49) through an intermediate electronic power control circuit assembly (56) to intermittently energize motor (14), significantly extending the useful life of batteries (50) of assembly (49).

Abstract: This invention pertains to induced vibration and the dampening of these vibrations in the motor means. Vibration induced by rotating a shaft having eccentric weights thereon has been used to produce all kinds of shaking apparatus including large car shakers in which the induced force may be as much as eight thousand two hundred pounds. These vibrations can be as much as five thousand six hundred vibrations per minute and can be used for huge bins and hoppers in which the capacity may be as much as one hundred fifty thousand pounds. Vibrators using air, electric or hydraulic motors can be tuned or adjusted to provide the desired results. Most of these vibrators using a tuned motor may be temporarily or permanently attached. Motor driven vibrators, as far as is known, transmits the vibrational force into the shaft of the motor. Said motors, which are usually standard off-the-shelf units have their rotor bearings designed for rotary motion rather than combined with a vibratory force.

Abstract: This invention pertains to induced vibration and the dampening of these vibrations in the motor means. Vibration induced by rotating a shaft having eccentric weight thereon has been used to produce all kinds of shaking apparatus including large car shakers in which the induced force may be as much as eight thousand two hundred pounds. These vibrations can be as much as five thousand six hundred vibrations per minute and can be used for huge bins and hoppers in which the capacity may be as much as one hundred fifty thousand pounds. Vibrators using air, electric or hydraulic motors can be tuned or adjusted to provide the desired results. Most of these vibrators using a tuned motor may be temporarily or permanently attached. Motor driven vibrators, as far as is known, transmits the vibrational force into the shaft of the motor. Said motors, which are usually standard off-the-shelf units have their rotor bearings designed for rotary motion rather than combined with or added vibratory force.

Abstract: This invention pertains to induced vibration and the dampening of these vibrations in the motor means. Vibration induced by rotating a shaft having eccentric weight thereon has been used to produce all kinds of shaking apparatus including large car shakers in which the induced force may be as much as eight thousand two hundred pounds. These vibrations can be as much as five thousand six hundred vibrations per minute and can be used for huge bins and hoppers in which the capacity may be as much as one hundred fifty thousand pounds. Vibrators using air, electric or hydraulic motors can be tuned or adjusted to provide the desired results. Most of these vibrators using a tuned motor may be temporarily or permanently attached. Motor driven vibrators, as far as is known, transmits the vibrational force into the shaft of the motor. Said motors, which are usually standard off-the-shelf units have their rotor bearings designed for rotary motion rather than combined with or added vibratory force.

Abstract: A machine for generating electrical power having a mechanical oscillator arranged to drive the armature of a linear generator. The oscillator, in turn, is driven by an independent prime mover.

Abstract: An electromechanical device comprised of a battery energized motor having widely separated poles and requiring momentum for operation applied by inertia from a lost motion fly-weight accelerated by the motor during commutation which momentarily starts and stops the motor for an extended dwell time and which subsequently restarts the motor for continued operation, there being primary sensory effects as a result of motor operation subject to speed change by the control of extraneous motion, there being a first motor commutated circuit energizing sensory effects, and there being a second cam switched circuit energizing sensory effects adjusted to long and short dwell modes, the motor operation and effects being synchronous at variable angular velocity within 180.degree. and 360.degree. of rotation.

Abstract: A drive motor for a flexible drive shaft of an internal vibrator or some other device potentially the source of an electrical shock features a cylindrical structure embodying a field assembly which slip fits in a cylindrical shell which embodies positioning means to which the field assembly and electrically connected commutator brush means may be releasably fixed. Slip fit as a unit into this shell is an armature assembly including a commutator means fixedly mounted directly to and about shaft means intermediate its ends. One end portion of the shaft means provides an electrically non-conductive coupling device for drivingly relating the shaft means to a device which must be powered. The shaft means has affixed thereto the inner races of bearing means to either end of the armature assembly the outer races of which are in direct contact with and protected by electrically non-conductive material forming part of end covers for said cylindrical shell.

Abstract: An electrically operated pulse motor having a stator and a rotor mounted within a chassis, the ends of the shaft of the rotor having been mounted in a pair of sleeves joined to the chassis, the inner diameter of the sleeves being larger than the diameter of the ends of the rotor shaft. The ends are connected with a pair of projecting semi-axles (axle shafts) of the rotor that are eccentric in relation to the shaft of the rotor and of a larger size than the aforementioned difference between the diameter of the rotor shaft and the inner diameter of the sleeve, the eccentricity between the projecting semi-axles and the rotor shaft being absorbed by means of the interposition of elastic couplings that change their shape during the operation of the motor.

Abstract: There is disclosed a vibrator equipped with a hollow motive shaft penetrating through a rotor of an electric motor to project front and rear of the motor and a vibrating shaft arranged in the hollow portion of the motive shaft in concentric and rotatable relations to rotate in the same direction as the motive shaft at a higher speed than the same through a rotation transmission mechanism interposed between said two shafts.

Abstract: An external-rotor type drum motor in which the rotor includes axially extending members to which are fastened the respective end bells of the motor. The motor is further provided with a drum cylinder which surrounds the rotor and the end bells and is secured axially by means of a ring which is bolted to one of the end bells and rests against an inner shoulder formed on the drum cylinder.

Abstract: Vibratory power unit for vibrating conveyers and screens comprising an asynchronous polyphase motor, at least one pair of associated unbalanced masses disposed on the shaft of said motor, with the first mass of a pair of said unbalanced masses being rigidly fastened to said shaft and with said second mass of said pair being movably arranged relative to said first mass, means for controlling and regulating the conveying rate during conveyer operation by varying the rotational speed of said motor between predetermined minimum and maximum values, said second mass being movably outwardly by centrifugal force against the pressure of spring means, said spring means being prestressed in such a manner that said second mass is, at rotational motor speeds lower than said minimum speed, held in its initial position, and at motor speeds between said lower and upper values in positions which are radially offset with respect to the axis of said motor to an extent depending on the value of said rotational motor speed.

Abstract: A device for producing linear vibratory motion includes, in the preferred embodiment, an electric motor of the contra-rotating type, i.e. one in which both the rotor and stator rotate about a common axis and in opposite directions. One or more pairs of eccentric weights are provided, one weight of each pair rotating with the rotor and the other with the stator. Gearing is provided to assure synchronized rotation of the rotor and stator and to determine the angle of the plane in which the weights are aligned and, hence, the plane along which the vibratory motion is directed.

Abstract: An ultrasonic piezoelectric device is disclosed, comprising a piezoelectric transducer having at least one piezoelectric element having a pair of electrodes on opposite sides of the element, a solid-state amplifier having input and output connections, a driver transformer having a primary winding connected to said output connection of the solid-state amplifier, the driver transformer having a secondary winding connected to the electrodes of the piezoelectric transducer, a feedback transformer having a secondary winding connected to the input connection of the solid-state amplifier, the feedback transformer having a primary winding, and a phase shifting circuit connected between the primary winding of the feedback transformer and the electrodes of the piezoelectric transducer.

Abstract: A variable vibration motor includes a rotor shaft having a fixed weight and a movable weight mounted thereon. Adjustable means are provided on the motor casing for adjusting the movable weight to various rotational positions about the rotor shaft, and manually operable means outside of the motor casing are provided for adjusting the adjustable means and thereby vary the rotational position of the movable weight when the motor is running.

Abstract: Ink is fed into an ink chamber in an ink ejection head. An ejection orifice communicates with the ink chamber. An electrostrictive plate defines a surface of the ink chamber and is strained to decrease the volume of the ink chamber when an electrical pulse is applied thereto to cause ink to be ejected through the orifice. The apparatus is inoperative if there is no ink in the ink chamber or there are air bubbles in the ink in the ink chamber. In such a case the voltage across the electrostrictive plate has an oscillating component, the oscillating component being damped out when the ink chamber is completely filled with ink. A sensor is provided to detect the oscillating component and generate a signal indicating said detection. Circuit means are provided to increase the magnitude of the pulse when the oscillating component has a magnitude indicating that the apparatus is not inoperative but some bubbles are present in the chamber.

Abstract: A hand held device for generating ultrasonic vibrations comprises an elongate tubular casing having therein a piezoelectric vibratory element comprising an elongate bar of piezoelectric material and a generator that develops an electrical signal having a predetermined ultrasonic frequency that excites the piezoelectric vibratory element into ultrasonic vibration. The piezoelectric vibratory element also functions as the dielectric of a capacitor which constitutes part of the generator and which determines the ultrasonic frequency of the electrical signal output of the generator. A work tool protrudes from the casing and is vibrationally coupled to the piezoelectric vibrator element by a vibratory rod which transmits the vibrations from the piezoelectric vibratory element to the work tool.

Abstract: A massaging vibrator where the motor is coupled directly to the vibrating pad and eccentric counter balance weights are disposed on both sides of the motor.

Abstract: A system for flaw detection during a continuous welding process uses a transducer to provide a signal burst for each acoustic burst from an article being welded. The signal burst is amplified and filtered to pass frequencies between about 100 and about 550 KHz. The ring-down counter counts signals of the filtered signal burst. The first signal of the filtered signal burst initiates a timing circuit that times out to provide a reset pulse to reset the ring-down counter. If the decimal count exceeds 100 but does not exceed 1000, the ring-down counter operates circuitry to provide a latched signal to an output of a flip-flop to enable a gate before the counter is reset by the reset pulse of the timing circuit. That reset pulse is also provided to the gate to provide at its output a pulse representing one filtered signal burst having more than 100 and no more than 1000 signals during the timing operation.

Abstract: An automatic punch press and monitoring system. The monitoring system includes a piezoelectric accelerometer mounted within the stationary die shoe of the punch press, and electronic circuitry including a variable gain amplifier, a detector, an integrator, and a comparator. The monitoring system is manually placed in a "LEARN" mode whereupon the signal produced by the accelerometer during normal operation of the punch press is amplified, detected, and integrated over the time period of one stroke to produce a test function. The gain of the amplifier is automatically adjusted during successive normal strokes of the punch press until the test function is equal to an arbitrary set point, thereby establishing a reference function. The monitoring system is then automatically placed in an "AUTO CONTROL" mode whereupon on each succeeding stroke, with the gain of the amplifier fixed, the test function produced is compared with the reference function.

Abstract: An electronic buzzer comprises an acoustic vibrator comprised of a circular metal plate having its entire periphery rigidly secured to a support, and a piezoelectric element adhered to one face of the metal plate. A driving circuit applies electric driving signals to the vibrator to vibrationally drive it at a 1/N multiple of its natural frequency, where N is an integer, so that the vibrator emits an audible buzzing sound. The metal plate is preferably mounted to undergo vibration in a natural vibration mode having only one nodal circle. The drive circuit includes an inductor connected in a closed loop with the vibrator, which functions as a capacitor, and the circuit applies signals at a selectively variable frequency to the closed loop to accordingly vary the inductance of the inductor to thereby vary the period of oscillation of the acoustic vibrator and the resultant frequency of the buzzing sound.

Abstract: A piezoelectric pressure sensor for detecting the amount of oil in an engine oil pan of an automobile, and liquid level or the amount of liquid such as water level in a water bath, makes use of the phenomenon that an impedance of an excited piezoelectric element varies between in a gas and in a liquid. The pressure sensor is insensitive to surrounding temperature, and has high response and is of simple construction.

Abstract: The invention relates to a device which forms the product of convolution of two signals available in electrical form. This device consists of a substrate of lead molybdate in which there are created, at the two ends, volume elastic waves, which are longitudinal and transverse respectively for each of the two applied signals. The non-linear interaction of these waves produces an elastic wave of transverse mode, representing the product of convolution of the two signals.

Abstract: A continuously programmable matched filter device using a piezoelectric substrate capable of propagating acoustic wave signals on a selected surface thereof and a semiconductor substrate mounted adjacent and spaced from such surface. Means are provided for altering the conductivity pattern in the semiconductor substrate in accordance with the wave form of a reference wave signal so that a representation of the reference wave is effectively stored therein. Storage of the reference is achieved with electrostatic charge by supplying a plurality of electrons in the spatial region between the substrates or by manipulating the carriers in the semiconductor material into trapping states in order to produce such altered conductivity pattern. A second signal can thereupon be propagated along the piezoelectric substrate to interact with the stored reference conductivity pattern to provide either correlation or convolution operation depending on the direction of propagation thereof along the piezoelectric surface.

Abstract: A ghost signal erasing system for television receivers in which a variable delay element utilizing the propagation of an elastic surface wave is used. The variable delay element includes a piezoelectric substrate, a plurality of first interdigitated electrode pairs formed on the substrate and a plurality of second interdigitated electrode pairs also formed on the substrate. An elastic surface wave produced by applying a video i-f signal to the first interdigitated electrode pairs is propagated along the surface of the piezoelectric substrate and taken up at the second interdigitated electrode pairs as a delayed a-c signal. By switching the first and second interdigitated electrode pairs to change the combination thereof, various delay times are obtained.

Abstract: A device for scanning patterns, e.g. optical patterns, in which on the surface of a piezo-electric material Bleustein-waves are produced, while in the material or in a semi-conductor layer deposited on the surface a drift field is produced. Said drift field pulsates between two levels, a low level at which the gain of the surface wave is independent of the "exposure" pattern and a high level at which the surface wave is locally amplified in accordance with the "exposure" pattern.

Abstract: The invention discloses various embodiments of an ultrasonic motor and converter adapted to be used in home or industrial ultrasonic devices. The ultrasonic motor is generally of a piezoelectric material having a removable tip or of a design in which the complete motor is contained in a housing, which housing has electrical contact means adapted to be plugged into an adapter which, in turn, is connected to a converter. The motor is designed such that frequency sensing means is provided therein and the feedback signal is utilized by the converter to adjust itself thereto. The converter includes tuned circuit means tuned to a band including a desired frequency for sustaining the vibration of said motor at the desired frequency.

Abstract: A piezoelectric transducer is positioned on a member of a power press subject to stress under dynamic conditions. A ball joint bracket means fixes and maintains the transducer on the member parallel with the direction of force and with the faces of the piezoelectric ceramic plate perpendicular thereto. The high voltage signal generated by the transducer is transmitted to a signal conditioning circuit and impressed upon the grid of a grid-controlled vacuum tube. If the conditioned signal is sufficient to overcome the biasing grid voltage, it activates an electric circuit for the performance of one or more functions, including stopping the power press in the case of an overload, counting the number of times the press is overloaded or the number of times a workpiece is produced, and measuring the press load during a work cycle.

Abstract: The electromechanical acoustic emission detector of this invention comprises a plurality of sensor elements secured in an areal array on a base plate. The spacing and arrangement of the sensor elements are such that the transducer is "tuned" to acoustic emission waves that travel along the surface of the vessel to which the transducer is attached. Because of the non-linear character of the array the transducer detects waves arriving from different directions with substantially equal sensitivity.

Abstract: A measuring circuit including a piezoelectric transducer contains an output charge amplifier circuit with a semiconductor element connected across the storage element of the charge amplifier. The semiconductor element controls the resetting or zeroing of the storage element to thereby effect control of the operation of the charge amplifier. Typically, the semiconductor element may be a field effect transistor, photo-device, etc., and the control of the same may be remotely controlled.

Abstract: A surface acoustic wave delay line uses a closed loop principle with separate input and output transducers side by side. 3dB Multistrip couplers are introduced to achieve substantially 100% transfer for surface acoustic wave energy from the propagation path associated with the input transducer to the propagation path associated with the output transducer. Several such delay lines can be formed on a single cylindrical body of piezoelectric material and these can then be cascaded with intermediate amplification to form a long delay or a tapped delay.

Abstract: A piezo electric signal generator and receiver assembly for a flaw detector has a generator adjacent to the crystal transducer and a cable connection to a distant point where a d.c. power supply and the indicator is located. The same cable is used for supplying power to the generator and for conveying to the indicator signals corresponding to both acoustic transmitted pulses and reflected returns. For this purpose a charging voltage is applied to a series circuit comprising the capacitor and crystal and this circuit is discharged by a switch connected to the capacitor at the input end of the charging circuit. Both transmitted and received signals are fed in the same direction through the cable and are therefore subjected to the same delays.

Abstract: A sensor for remotely monitoring a physical stimulus is rendered completely self-contained by utilizing the equivalent electrical signal transduced from the stimulus to power an A. C. signal source as well as to modulate the A. C. signal generated therefrom before transmitting the modulated A. C. signal to the remote monitoring location.

Abstract: Apparatus and a corresponding method for the protection of an ultrasonic transducer operating immersed in a liquid, such as in an ultrasonic nebulizer. Surface motion of the liquid is detected by analysis of the voltage across the transducer terminals, and this surface motion indication is combined with a transducer temperature indication to determine whether or not the transducer should be shut off to prevent destruction or damage due to overheating or absence of surrounding water. Once turned off, the transducer cannot be re-energized without the removal and reapplication of electrical power to the apparatus. Provision is made for allowing the transducer to remain on even when no surface motion is present, provided the temperature is below a certain value, to permit adjustment of the transducer circuit while the transducer is in operation. An alarm is actuated when the transducer is turned off to call attention to the high temperature or loss of surface motion.

Abstract: In an oscillator-exciting system for a ultrasonic liquid nebulizer, a piezo-oscillator element for nebulizing the liquid is electrically connected to a self-exciting oscillating circuit as a constituent element thereof and the circuit is oscillated at that frequency at which the electric impedance of the piezo-oscillator element is inductive. A protective transistor may be connected to a current-bias resistance of the oscillating circuit, which protective transistor may be cut off by a reed switch sensing the exhaustion of the liquid being nebulized and/or by an overcurrent sensing circuit, for ceasing the oscillation in case of liquid exhaustion and/or overcurrent.

Abstract: At least three pairs of opposing electrodes on the two major faces of a poelectric or electrostrictive transducer element having a gap which is adapted to change in response to selected control voltages applied across the three pairs of electrodes. The pairs of electrodes are electrically insulated from one another and one pair of electrodes covers substantially one half of the major faces across from the gap, while the other two pairs of electrodes are disposed on the major faces of the transducer adjacent the gap and respectively covering substantially quarter sector portions of the transducer surface. By the mechanical bonding of electrical switch contacts for example to the opposing end faces at the gap, switch actuation is provided by the application of control voltages across all three pairs of electrodes, causing the gap to diminish and thereafter shorting the pairs of electrodes or applying a reverse control voltage to widen the gap.

Abstract: A control circuit for cyclically operating one or more piezoelectric transducers to transmit and receive ultrasonic signals is disclosed. The circuit comprises a power transistor in series with an induction coil and controlled by a timing circuit to conduct for a short time during each cycle. As the power transistor cuts off a high voltage pulse is generated by the induction coil and this is fed via a zener diode as the transmission signal to the or each piezoelectric transducer across which is connected a switching circuit comprising a potential divider and a pair of opposite polarity diodes which automatically feed off the high voltage transmission signal to earth and pass low strength received signals to an amplifier.

Abstract: A tubular section is constructed for radial and axial resonance. The tubular resonator is clamped along a line of clamping engagement near one end of the tubular section and is driven by means of radially directed oscillatory force applied at a line of driving engagement spaced from the line of clamping engagement. The oscillatory force is obtained from a driver which is formed of an annulus of piezoelectric crystal polarized in a radial direction, having an inner base ring and outer annular driver wedge, triangular in cross section. Since the frequency of radial resonance is a function of the radius of the tubular section, and the frequency of axial resonance is a function of the length of the tubular section, the two frequencies of resonance are made to coincide by proper selection of tube radius and length and the resonant frequencies therefore made to reinforce one another.

Abstract: A wide bandwidth, high gain ultrasonic frequency transducer drive circuit utilizes a relatively low voltage source of supply voltage. A first signal path from a source of drive signals includes circuitry resonant with the transducer for providing a relatively high signal voltage across this transducer. A second signal path from the source of drive signals includes a resonant circuit mutually coupled to the first resonant circuit for inducing signal energy into the first path and increasing the signal voltage across the transducer.

Abstract: A device for correcting the frequency response of an electromechanical transducer, thus allowing said transducer to be used over a wide frequency band and set at or near its resonance frequency. The device includes a delay element having substantially the inverse transfer function of said transducer. An amplifier may be connected between said transducer and said delay element. Said delay element may comprise a variable delay line such as an adjustable length of coaxial cable, and may also include an integrated delay line.

Abstract: A radiation detector utilizing temperature changes particularly suited for detecting small changes of short duration, such as produced by radiation pulses of microjoules of energy and 10 to 100 nanoseconds duration. An acoustic transmission line with transducers on a substrate providing an acoustic surface wave in the substrate, with the phase change in the wave being a measure of the temperature change at the surface of the substrate.

Abstract: A surface acoustic wave filter including a relatively broad band input transducer that launches acoustic energy along a first path, at least one frequency-selective periodic grating filter disposed in the first path and adapted to reflect the energy incident thereon along an intermediate path, at least one frequency selective periodic grating filter disposed in the intermediate path and adapted to reflect the energy incident thereon along an output path to an associated output transducer.

Abstract: An elastic surface wave device comprises a piezoelectric body and interdigital type electric signal-surface wave conversion conductors formed one at each end portion of one surface of the piezoelectric body. A groove elongated in a surface wave propagation direction is provided in a surface opposite to the surface on which the conversion conductors are formed.