Abstract: When cooling power corresponding to an amount of heat generated by an electronic apparatus can be generated by either n or n+1 cooling units, n+1 cooling units are operated such that each of the cooling units keeps a sufficient margin in reserve. In this manner, even if an abnormality occurs in one of the cooling units, the operation can be continued by the n cooling units. Further, since an operation frequency of a compressor in the cooling unit can be decreased to rotate a motor in the compressor at a lower rotational speed, a speed at which a bearing is worn is slowed, whereby the useful life of the bearing can be prolonged.

Abstract: A refrigerant composition capable of attaining a temperature as low as -80.degree. C., without using regulated refrigerants having a high potential of destroying the ozonosphere and capable of being used as a substituent refrigerant for R503 in view of refrigerating or other performance is provided. A refrigerant composition comprises an azeotropic mixture of trifluoromethane and hexafluoromethane.

Abstract: A refrigerant leak detection apparatus and method for testing for leaking frigerant within a heat exchanging fluid, particularly for testing for leaking refrigerant in a chiller system comprising heat exchangers.

Abstract: A method is presented for the transfer of heat from a low to a higher temperature, in that the main medium in gas form is heated and compressed, after which this main medium is conducted to a first heating chamber (1) where heat at low temperature is added to the main medium, whereafter the gas is conducted to a compressor (8) and compressed, in that before being conducted to the first heating chamber (1), the main medium can undergo a pressure drop and a possible heat absorption in a heat exchanger. In the first heating chamber (1), there is added an auxiliary medium in liquid form which evaporates together with the heating of the main medium, so that after the heating the main medium is more or less saturated with the auxiliary medium in vapor form, in that the heat is added from a second heating chamber (2) in which a gaseous medium containing evaporated auxiliary medium is cooled for the condensation of the auxiliary medium.

Abstract: The ancillary heat pump apparatus of the present invention for producing domestic hot water generally includes a domestic hot water heat pump having refrigerant and water circuits which are operatively disposed at the proximal ends thereof into close array at the heat exchanger of tile domestic hot water heat pump. The refrigerant circuit of the domestic hot water heat pump hereof has a heat exchanger coil disposed at the distal end thereof, and the water circuit is connected at the distal end thereof to a hot water heater. In the apparatus of the present invention, the distal refrigerant circuit heat exchanger coil is disposed into operative heat exchanging position, directly or indirectly, with a return fluid stream of a heat source. In combination therewith is a multimodal dehumidification apparatus providing a valve for defining flow through a selected portion of dehumidification coils.

Abstract: In a refrigerating apparatus for use in transportation, condenser fans for feeding external air to a condenser and evaporator fans for feeding air in a freezer compartment to an evaporator are mounted on a common shaft driven by an engine. The condenser fans and evaporator fans have propellers of the same size. The common drive shaft is disposed parallel to a drive shaft of the engine.

Abstract: A reversible heat pump providing a generator of refrigerant fluid in a vapor state produced by a rectifying column having perforated plates, with a hydrostatic head on the plate assured by the surface tension of the liquid, a reboiler of the generator heated indirectly, a storage tank of the condensed refrigerant fluid which contributes to controlling the cycle pressure for optimizing the efficiency under partial load conditions, expansion valve for the condensed refrigerant which changes the flow section as a function of the pressure and controls the flow rate of the refrigerant for draining any impurity, electro valve reducing the load loss of the expansion valve during summer, a plate absorber with swirl grid providing a microdrop flow between poor solution and refrigerant, and a multi-way valve which allows the heat pump to be coupled with a split-exchanger by deviating the flows of the operating fluids according to the requirements so as to cause the split-exchanger to perform the function of a cold sour

Abstract: A fastener for jewelry has a bottom body having a stud forming a male part, a safety disc movable relative to the bottom body between an open position in which it leaves a space between the stud and the safety disc and a closed position in which the space is not provided, a spring urging the safety disc to the closed position so that for displacing the safety disc from the closed position to the open position the safety disc has to be displaced against a force of the spring, and a female member connectable with the article of jewelry and placeable on the stud in the open position so that in the closed position the female member cannot be withdrawn from the stud.

Abstract: A fastener for jewelry has a closing body having two diametrically opposite ends as considered in one direction each provided with a stud arranged so that a space is formed between the body and an end of each of the studs, two rings provided on ends of a jewelry string and being passable through the spaces and settable on the studs, and a closing disc provided with pins which in a closed condition close the spaces between the closing body and the studs and therefore prevent unauthorized withdrawal of the rings, the disc being movable sideward in the first direction so as to displace the pins from the spaces and therefore allow a withdrawal of the rings from the studs through the spaces.

Abstract: A device for securing equipments such as personal computers, monitors, printers and the like by using a cable which is secured to a relatively immovable fixture. The device comprises a wire cable with a plastic sheath and having a bulbous protrusion on one end, a plurality of fastener blocks, a metal ring and a cam lock assembly. The cable locking device is secured to various equipments by fastener blocks with the cable passing through the blocks, the bulbous protrusion on the cable end preventing the cable from being pulled through the blocks. The free end of the cable is looped around a suitable pillar or immovable object, passing through a ring and thence through a cam lock assembly. By turning a key in the cam lock, the lock assembly is clamped to the cable, preventing the cable loop from being removed. Access to the screws holding the blocks to the equipment is prevented by the cable passing through the blocks above the screws.

Abstract: A laptop computer security attachment and handle assembly comprising an elongated mounting bracket having at each end and extending perpendicularly therefrom an L-shaped bracket and an elongated handle member with bushings for pivotally attaching the handle member to the L-shaped members. One of the L-shaped members is provided with an elongated hole for receiving a security cable for securing the laptop computer to a structure as by a padlock, or the like.

Abstract: Device for closing and coupling carryall cases having a shell and a counter-shell which are mutually hinged, the shell being provided with brackets for coupling to racks of a motorcycle. The device has a shaped plate fixed inside an accommodation seat defined within the shell. The shaped plate has first pivoting lugs for linkages which define a first pivoting axis for lever systems for coupling to the counter-shell and a second pivoting axis for a locking plate. The shaped plate has second pivoting lugs for a handle of the case, and the locking plate is provided with a lock and bolt mechanism for closing the device and with an opening for permitting uncoupling of the carryall case from a motorcycle. A snap-action release button connects the linkages to the first pivoting lugs and connects the handle to the second pivoting lugs. The handle has a cross-member which, in closed position, is interposed between the lever systems and the locking plate.

Abstract: A cover lock assembly for a process transmitter having threadably removable end caps and corrugated outer surfaces is provided for engaging the corrugated surfaces by way of a toothed cover lock which is removably affixed to the transmitter housing.

Abstract: A locking device for selectively lockingly engaging a towing element of a trailer to block coupling access to the towing element. The locking device includes a housing defining a towing element receptacle, an engaging element having an engaging portion and an actuating portion for selectively engaging a towing element disposed within the towing element receptacle, a locking compartment adapted to house the actuating portion of the engaging element, a locking compartment cover, an actuating tool coupled to the locking compartment cover and adapted to cooperate with the actuating portion of the engaging element, a locking chamber for receiving the actuating tool when the locking compartment cover is in a closed position, and a lock for selectively locking the actuating tool within the locking chamber and locking the cover in place.

Abstract: An apparatus for locking and unlocking one or more storage compartments in a truck service body includes a channel assembly that is slidably secured to the service body by at least one channel support. A rod assembly having an L-shaped locking bracket is slidably secured to the service body by a plurality of rod supports. The rod assembly passes through the channel assembly. A handle for manually moving the rod assembly between a locked position and an unlocked position is included. The handle is rigidly secured to the channel assembly and extends outside of the service body. The handle is adapted for coupling to the service body by a manual locking mechanism. An electro-mechanical actuator is coupled to the rod assembly for moving the rod assembly between its locked and unlocked positions.

Abstract: A double cylinder tubular deadbolt having the inside cylinder provided with a removeable cap or cover which covers the exposed screws in the flanged face of the inside cylinder. The removable cover fits over and covers the face portion of the inside cylinder. The cover is retained in place by an escutcheon which fits over the flanged face with the cover thereon.

Abstract: A locking mechanism is provided which is characterized by one or more blocking elements each consisting of two complementary semi-cylindrical parts (2),(3) snugly located in a correspondingly shaped aperture (4) defined between two relatively movable parts (5),(6) to be locked together, one of the semi-cylindrical parts (2),(3) being adapted to be operatively coupled to a key (8) to permit rotation of the two complementary semi-cylindrical parts (2),(3), whereby the two semi-cylindrical parts (2),(3) can be rotated between a position in which they prevent movement of the two lock parts (5),(6) and a position in which the two lock parts (5),(6) are relatively movable.

Abstract: A rocker mill includes a pair of roll dies rotatably mounted in a structure and having tapered circumferential grooves for receiving a workpiece. A support is provided for supporting the structure so that it is longitudinally movable relative to the support. The support is rotatably mounted on a frame. A reciprocating driving apparatus is provided for reciprocating the roll dies longitudinally relative to the support through a reduction stroke and a smoothing stroke. A rotating driving apparatus is provided for rotating the roll dies around a longitudinal axis of a workpiece. A method of forming reduced diameter tubing is also described.

Abstract: An adjustable elevator rail repair device (14) is provided with a means for forcing raised damaged areas (18) of an elevator rail (10) back into the corresponding depressions (20) of the rail surface (9). The forcing means comprises a roller (24) rotatably mounted within a wedge (22), adjustably positioned in a housing (16). A method is disclosed for repairing the damaged rail (10) comprising a calculating step to determine the amount of adjustment necessary for the rail repair device (14).

Abstract: A method of stretching and bending hollow profiled lengths of material provides for the hollow profiled length to be bent symmetrically from both ends, starting from the ends of the length of material, simultaneously in a Y torsion direction under initial tension. Respective tools for bending the length of material are stationary and the hollow profiled length of material is bent in the torsion direction by means of a movable clamping head about the bending tool. The clamping head is also pivotable in the torsion direction. Alternatively, the hollow profiled length of material can also be bent about a bending template. The hollow profiled length of material is wound onto core tools from its ends and a pressing die acts on the hollow profiled length between the core tools.

Abstract: An apparatus for forming a curved, flat sided surgical needle, which comprises a frame member including an anvil member having an arcuate surface profile; a movable first die member for simultaneously imparting an arcuate profile and at least a pair of first opposing flat surfaces to a body portion of a needle blank and adapted to receive a needle blank, the first die member having an arcuate needle forming surface which is substantially parallel to the arcuate surface of the anvil member; a first side tool for curving a tapered end portion of the needle blank about the anvil; a transfer tool adapted to slide the needle blank along the anvil a side press adapted to import second flat surfaces to a second pair of opposing sides of the body portion of the needle blank; a second side tool member for curving a drill end portion of the needle blank about the anvil; and an ejection tool for moving the needle blank away from the anvil.

Abstract: A circuit for evaluating the output of, and for testing, a capacitive sensor, such as those useful for triggering airbags, features two switches (6, 7) for selecting among a test mode and a measurement mode. In the measurement mode, two measuring capacitances (3), formed by a center electrode (1) and a respective one of the two measuring electrodes, are connected to a capacitance bridge (5). In the test mode, one of the measuring capacitances is replaced by a reference capacitance (4), and the replaced measuring capacitance is connected to a voltage source (8).

Abstract: The flowrate of powder in an air-powder mixture circuit comprising a mixture drive area defined by a powder drive device comprising air injector means adapted to inject air in the direction in which the mixture is to be driven is measured by measuring the pressure difference across the drive area and the injected air flowrate and computing the powder flowrate as a function of these two variables. The degree of wear of a venturi tube which forms the drive area is calculated by integrating with respect to time two parameters representing air-powder mixture flow rate and the air flow rate.

Abstract: A device for measuring the relative proportions of gas, oil and water in a conductive pipe includes at least one open-ended, conductive tube having a radius different from the pipe, disposed within the pipe. Microwave transmission structure transmits microwave signals along the pipe and the at least one tube at a plurality of frequencies, the pipe and the at least one conductive tube acting as waveguides for the microwave signals. At least two microwave receiving devices are disposed at separate positions having different respective radii, spaced apart along the pipe and at least one tube, for receiving the microwave signals transmitted by the transmission structure. Determining circuitry determines the relative proportions of gas, water and oil in the pipe by comparing the transmitted and received signals.

Abstract: The invention relates to an oxygen sensor which measures the concentration of oxygen based upon ultrasonic sound waves traveling through a binary gas. The measured sound-wave delay through the gases determines the concentration level for oxygen within the transducer chamber. The invention includes an L-shaped housing where a transmitter/transducer is attached to one end of the housing and the receiver/transponder is positioned at the junction between the two substantially straight portions of the L-shaped housing. A straight transducer chamber is thereby provided, while simultaneously provided a housing design which minimizes reflected standing waves for detection by the receiver/transponder. The invention includes a sonic baffle positioned at the opposite end of the L-shaped housing from the transmitter/transducer which minimizes standing waves thereby improving the performance of the gas detection device.

Abstract: A system for determining the fractional capture efficiency of filters includes two filters having substantially the same capture efficiency connected in series. A steady, controlled flow of ultrapure water and a colloidal silica suspension is directed through both filters, with respective stages of the flow upstream of the upstream filter, between the filters and downstream of the downstream filter, directed to respective non-volatile residue monitors. Each residue monitor produces a digital output representing the non-volatile residue concentration at its respective stage. A microprocessor receives the digital outputs and generates respective residue values indicating residue concentration in parts per billion. The three residue values are used to characterize the residue by proportion of the colloidal silica suspension to other residue components, and to calculate filter capture efficiency with respect to the colloidal silica.

Abstract: To be used in a gas supply line having an upstream main on/off valve, a meter downstream of the valve, and a pressure regulator intermediate of the valve and meter, the gas supply line being used to supply gas to appliances at an installation site, a gas leak detection test station including a fitting connected in fluid communication with the line downstream of the pressure regulator, fitting having a body with a main inlet opening, a main outlet opening, and a flow path between the openings. The station further having a fixed valve body portion integrally formed with the body of the fitting, the fixed valve body having a movable valve portion which is movable between a normal valve closed position and a valve open position, the movable valve portion normally being urged towards the normal closed position, the body portion being adapted for connection with a manometer.

Abstract: A technique is disclosed for obtaining the true capillary pressure curve directly from experimental measurements. The above said technique is based on the use of a small-size sample being into capillary contact with the sample to be tested, with the usual tail effects being thus prevented. The resulting experimental data does not require complex mathematical processing yielding approximate results.

Abstract: Apparatus for monitoring suction leakage of external air into the exhaust gas path of an internal combustion engine during intermittent reduced pressure phases of engine running, includes two oxygen concentration sensing lambda probes arranged at a distance from one another along the path. The probes issue signals indicative of such oxygen concentration which are fed to a control device, such that an error signal is generated on deviation of the two probe signals from one another as caused by suction entry of external air into the path solely during a reduced pressure phase.

Abstract: An apparatus (20) for sensing pressure in a stiff wall sealed vessel (30) comprises a speaker (60) operatively coupled to the vessel (30) for, when energized, transferring energy to pressurized fluid in the vessel (30). The energy transferred from the speaker (60) establishes oscillations of the pressurized fluid in the vessel (30). A piezoelectric capacitive sensor (62) is operatively coupled to the vessel (30) for providing a received electrical signal having a frequency value indicative of the oscillation frequency of the pressurized fluid in the vessel (30). A receiver circuit (70, 90, 110) is operatively connected to the capacitive sensor (62) and provides a fluid resonating signal having a frequency indicative of the natural frequency of the oscillating pressurized fluid in the vessel (30). The natural frequency of the pressurized fluid is indicative of the fluid pressure in the vessel (30).

Abstract: Misfiring in an engine cylinder can be detected based on the pressure therein as sensed by a pressure sensor with a high degree of reliability at any time even if the output signal of the pressure sensor contains an offset component superposed on a pressure component representative of the actual cylinder pressure. In one form, the pressure sensor output is differentiated to eliminate the influence of the offset component and then processed to generate a power stroke pressure information signal in the form of the time of a pressure-change peak in the differentiated pressure sensor output or an integrated value of the differentiated output, which is then compared with a threshold so as to determine whether misfiring took place in the cylinder.

Abstract: An apparatus for testing components of an electronic engine governor is disclosed. The governor to be tested has a speed control unit responsive to a control signal for producing a fuel control signal and an amplifier coupled to the speed control for compensating engine load, and may have a load computer for producing a load signal indicative of engine loading. A voltage controlled oscillator (VCO) in the test apparatus is adapted to be coupled to the speed controller for simulating engine speed as a variable frequency output in response to an input voltage. A summing node is adapted to be responsive to the output of the speed control unit and the load computer for producing a summed input control signal to the VCO. Substitute voltage and current signals are provided as input to the load computer to check the load computer operation.

Abstract: A method and apparatus for carrying out the checking of the state of wear of a covering fabric in a driving belt (2) mounted on a plurality of pulleys (3, 4, 5) by measuring the electric resistance variations of the belt fabric. The apparatus provides that at least two of the pulleys (3, 4, 5) should be electrically insulated with respect to each other and connected to an electric circuit (20) designed to apply an electric voltage to said pulleys in order to carry out the measuring of the electric resistance of the fabric exhibited by belt stretches (A, B) comprised between the pulleys themselves. The electric resistance thus found lends itself to be compared with predetermined resistance values corresponding to different states of wear of the belt (2) fabric. The work surface of the belt (2) is coated with an electrically conductive fabric (12) acting by contact on the pulleys (3, 4, 5) and having characteristics of tensile strength.

Abstract: A depth measuring system for a slickline utilized in a well bore operation where the slickline is in a non-slip relationship with the circumference of a calibrated measuring wheel and the revolutions of the wheel are utilized to provide a first length measurement. A load cell is provided to measure tension in the slickline so that length elongation of the slickline due to tension can be determined. A temperature differential determination is made so that corrections in length can be made for the temperature effects. The temperature differential can be temperature effects on the measuring wheel and/or temperature effects of the slickline in the well bore. The measuring wheel determination of length is algebraically summed with the tension elongation and changes due to temperature to provide a more accurate indication of the depth measurement in the well bore.

Abstract: An in-hole oil-drilling probe is mountable in a drill string to measure hydrocarbon concentrations in drilling fluid flowing around the drill string. The probe consists of a drill collar which is mountable in the drill string. A solvent, in which hydrocarbons are soluble, circulates within the drill collar through a hydrocarbon detection chamber. A membrane in the drill collar has an outer surface positioned to contact flowing drilling fluid and an inner surface positioned to contact circulating solvent within the drill collar. The membrane allows hydrocarbons to permeate from the drilling fluid into the solvent and into the hydrocarbon detection chamber with the solvent. A radiant energy source directs radiant ultra-violet energy into the hydrocarbon detection chamber. A sensor apparatus measures fluorescent energy radiating from the hydrocarbon detection chamber to determine solvent hydrocarbon concentration.

Abstract: The present invention is an improved apparatus and method for measuring downhole flowing and shut-in pressures to determine the condition of the reservoir and the potential of the well as a stimulation candidate. The tool string of the present invention is a novel combination of existing equipment that allows an electronic pressure gauge and shut-in tool to be run into the hole with coiled tubing. The present invention, in most cases, solves the potential problem of having to shut in or kill a flowing well prior to and after performing pressure testing, preventing lost production or potential well damage due to the killing operation. In addition, the present invention provides accuracy over current coiled tubing systems by reducing the effects of wellbore storage on pressure build-up testing.

Abstract: A process and a device for creating production logs in a gushing well. A seal permits measurement of at least part of the upstream flow and/or downstream flow in the well relative to the seal. The pressure differential is monitored on either side of the seal.

Abstract: The insertion of thread into a yarn tester is accomplished by a mechanism that includes a clamp (3) for the thread end and an insertion arm (14) mounted for pivoting movement about a fixed axis to contact a portion of the thread above the clamp and swing a loop portion of the thread down into the space between feed rollers and to present the loop to a take-over nozzle (13). The thread is transferred from the insertion arm to the nozzle (13) and is fixed until transfer in the clamp (3), so that the thread transfer takes place in the form of a loop. Consequently, the insertion arm (14) need have no special thread clamp and can be of correspondingly simple design. The pivoting movement of the insertion arm (14) requires only a simple drive, and the take-over of the loop-shaped thread (F) by the take-over member is carried out without difficulty.

Abstract: A thermal air flow meter having therein a thermo sensitive film resistor and a charging current control circuit for controlling a current supplied to the thermo sensitive film resistor both being formed on a commom substrate by the same process technology, and the thermo sensitive film resistor unit being disposed along a direction of flow of an air to be detected.

Abstract: A heat-sensitive flow rate sensor employs a measuring resistor unit which has patterning wirings formed on a heat-sensitive resistor and presenting a principal pattern which extends in parallel with the longitudinal axis of the measuring resistor unit. Temperature distribution over the heat-sensitive resistor is made uniform so that measuring error due to change in the temperature of a measured fluid is reduced, thus enabling flow rate measurement at enhanced accuracy.

Abstract: An on-line fishing depth indicator is adapted to be placed either in series or in parallel on a typical fishing line in combination with fishing bait. The indicator is adapted to read and store the maximum depth of the bait during a trolling operation under controlled conditions. This permits the user to determine the performance of the bait under certain, predefined conditions. The electronics and pressure transducers associated with the indicator are self-contained in the unit.

Abstract: A sensor is proposed which is used for detecting the acceleration and the inclination of a movable object (10), in particular a motor vehicle. A bubble level (11) is fixed on the object (10). The bubble level (11) comprises a housing (12), a liquid (16) contained in the housing (12) and a gas bubble (17) contained in the housing (12). The liquid (16) and the gas bubble (17) together completely fill the hollow chamber (15) enclosed by the housing (12), so that the gas bubble (17) is not completely enclosed by the liquid (16), but lies against the interior of the housing (12), so that the surface separating the liquid and the gas pushes against the interior of the housing (12). The gas bubble (17) is in an initial position inside the housing (12) when the acceleration and the inclination of the bubble level (11) are equal to zero or their effects are mutually canceled out.

Abstract: A grade and acceleration sensor having a weight, a first sensor for measuring a first parameter of the weight due at least to the force of gravity to generate a first signal, a second sensor for measuring a second parameter of the weight due to both the force of gravity and the acceleration of the vehicle on which the sensor is mounted to generate a second signal, a grade angle generator generating the grade angle .theta. in response to the first and second signal, and an acceleration generation generating a signal having a value corresponding to the acceleration of the vehicle in response to the first and second signals. In a first embodiment, the weight is a bob of a pendulum, the first parameter is a displacement angle of the bob due to acceleration and gravity and the second parameter is the force on the arm of the bob due to gravity and acceleration.

Abstract: A microwave resonator accelerometer including a microwave resonant cavity having a predetermined resonant frequency; the cavity including a flexible portion; a proof mass fixed to the flexible portion for changing the geometry and establishing a new resonant frequency of the cavity in response to an acceleration force on the proof mass; a microwave frequency signal at or approximately at the predetermined resonant frequency coupled to the cavity; and a discrimination circuit, responsive to the reflected microwave signal from the cavity, for discriminating a shift in the predetermined resonant frequency of the cavity to a new resonant frequency effected by the change in geometry of the cavity resulting from the acceleration force on the proof mass.

Abstract: An acceleration sensor assembly is shown, which comprises a base board; a ceramic plate bonded to the base board, the ceramic plate having predetermined circuits printed thereon; an operational amplifier in the shape of Silicon-chip, the amplifier being mounted on the ceramic plate; an acceleration sensor proper mounted on the ceramic plate, the sensor proper being of a piezoresistance semiconductor type; a first group of bonding wires through which the operational amplifier and the circuits are connected; and a second group of bonding wires through which the acceleration sensor proper and the circuits are connected. In order to facilitate the bonding connection of the bonding wires to their associated parts, the bonding wires of the first and second groups are identical in diameter.

Abstract: Method and apparatus are provided for detecting crack-like flaws in components. A plurality of exciting frequencies are generated and applied to a component in a dry condition to obtain a first ultrasonic spectrum of the component. The component is then wet with a selected liquid to penetrate any crack-like flaws in the component. The plurality of exciting frequencies are again applied to the component and a second ultrasonic spectrum of the component is obtained. The wet and dry ultrasonic spectra are then analyzed to determine the second harmonic components in each of the ultrasonic resonance spectra and the second harmonic components are compared to ascertain the presence of crack-like flaws in the component.

Abstract: A measuring apparatus using an ultrasonic wave according to the invention transmits an ultrasonic wave pulse into a specimen, receives the echo reflected by the specimen and converts it into an electric signal. The components of the electric signal that represent the wave reflected by the specimen and contain data on the state of the specimen are extracted by a gate circuit. The components obtained by the gate circuit are converted into a power spectrum by a circuit for performing a Fourier transformation. The thickness of the specimen and/or the flaking state of the specimen can be determined from this power spectrum.

Abstract: An armature for an electromagnetic vibration generator is suspended at its periphery by a plurality of circumferentially spaced flexure members each connected to the vibrator stator by means of an anchoring bracket having a floating part connected to the outer end of the flexure member and a stationary part connected to the stator. The brackets are provided with recesses in each of which is located a resilient member of elongate form. The recesses have closed ends so as to reduce the tendency of the material of the resilient members to migrate during operation of the vibration generator as well as to provide rotational stiffness for the complete armature suspension assembly.

Abstract: A transducer for generating or detecting ultrasonic energy of very narrow bandwidth which closely approximates a monochromatic source or detector has a gas gap of uniform dimensional width. The transducer employs standing ultrasonic waves generated, by multiple reflections and constructive interference, within the gap, effectively acting as a filter to pass only ultrasonic waves having a predetermined resonant frequency in response to impingement of broadband ultrasonic energy. This filtering effect enables the transducer to act as a source or detector of monochromatic ultrasound.

Abstract: An optical pressure transducer includes a body for supporting therein both an input optical fiber and an output optical fiber. A light source generates input light to the input optical fiber. A force responsive diaphragm is secured to the body and deflects in response to sensed pressure. A fixed reflector and a moveable reflector, which is attached to and moves with the diaphragm, are disposed in the optical path between the input and output optical fibers and reflect at least a portion of the input light from the input optical fiber to the output optical fiber. The amount of light reflected depends upon the deflection of the diaphragm. A system for monitoring and controlling the light source, including an optical detector in a feedback arrangement, is provided such that the amount of light generated by the light source remains constant and maximized.