Abstract: An apparatus and method for monitoring a reciprocating member of a reciprocating piston compressor is presented. The apparatus and method provide a means for measuring parameters of the reciprocating member, such as road load or cross-head temperature and the like, and wirelessly transmitting the data to a receiver. A mobile assembly is attached to a reciprocating member of the compressor, the mobile assembly having a sensor assembly, a wireless transmitter and a power generation assembly. The sensor assembly measures a parameter of the reciprocating member and generates a representative sensor signal. The wireless transmitter wirelessly transmits a corresponding data signal to a stationary assembly mounted nearby. The power assembly powers the transmitter and sensor assembly. The measured data is used, in conjunction with other measurements, such as a crankshaft encoder, to calculate the work performed by the compressor, the power used by the compressor and other information.

Abstract: An apparatus and method for monitoring a reciprocating member of a reciprocating piston compressor is presented. The apparatus and method provide a means for measuring parameters of the reciprocating member, such as road load or cross-head temperature and the like, and wirelessly transmitting the data to a receiver. A mobile assembly is attached to a reciprocating member of the compressor, the mobile assembly having a sensor assembly, a wireless transmitter and a power generation assembly. The sensor assembly measures a parameter of the reciprocating member and generates a representative sensor signal. The wireless transmitter wirelessly transmits a corresponding data signal to a stationary assembly mounted nearby. The power assembly powers the transmitter and sensor assembly. The measured data is used, in conjunction with other measurements, such as a crankshaft encoder, to calculate the work performed by the compressor, the power used by the compressor and other information.

Abstract: A diffraction-optical component for providing a radiation-diffracting grating structure is proposed, comprising a surface wave device including a substrate 43, a surface wave source 47 excitable with an adjustable frequency for producing surface waves on a surface 45 of the substrate 43 and an interaction region 17 of the substrate surface 45 which is provided for the radiation to interact with a grating structure provided by the surface waves produced.

Abstract: An apparatus and method for monitoring a reciprocating member of a reciprocating piston compressor is presented. The apparatus and method provide a means for measuring parameters of the reciprocating member, such as road load or cross-head temperature and the like, and wirelessly transmitting the data to a receiver. A mobile assembly is attached to a reciprocating member of the compressor, the mobile assembly having a sensor assembly, a wireless transmitter and a power generation assembly. The sensor assembly measures a parameter of the reciprocating member and generates a representative sensor signal. The wireless transmitter wirelessly transmits a corresponding data signal to a stationary assembly mounted nearby. The power assembly powers the transmitter and sensor assembly. The measured data is used, in conjunction with other measurements, such as a crankshaft encoder, to calculate the work performed by the compressor, the power used by the compressor and other information.

Abstract: A diffraction-optical component for providing a radiation-diffracting grating structure is proposed, comprising a surface wave device including a substrate 43, a surface wave source 47 excitable with an adjustable frequency for producing surface waves on a surface 45 of the substrate 43 and an interaction region 17 of the substrate surface 45 which is provided for the radiation to interact with a grating structure provided by the surface waves produced.

Abstract: A lithotriptor station has a shockwave generator connected to a drive circuit and an x-ray system for generating an image of the calculi to be disintegrated. An output of the x-ray system is applied to a detection circuit which forms an electrical signal corresponding to the degree of calculus disintegration in the x-ray image. The electrical signal is supplied through a computer to the drive circuit for the shockwave generator for controlling the number of shockwaves administered.

Abstract: An X-ray diagnostic system for angiographic X-ray examinations having an X-ray source for irradiating a patient, a television image intensification chain, and an image subtraction device for producing images which are the result of the difference between images taken at a progression of discrete times during which the concentration of an X-ray contrast medium in blood vessels changes. The subtraction device is provided with two image memories. A control device having a preprogrammable memory controls the times at which image data are stored in the image memories. The preprogrammable memory may be programmed for each time of image storage, or may be programmed only for the times of storage in the first image memory and a time delay factor for storage in the second image memory relative to the times of storage in the first image memory. The time delay factor may be constant or variable.

Abstract: An X-ray diagnostic system for angiographic X-ray examinations having an X-ray source for irradiating a patient, a television image intensification chain, a digital semiconductor memory for storing image data and an image subtraction device for producing images which are the result of the difference between images taken with the patients injected with an X-ray contrast medium and images taken without the X-ray contrast medium. The resulting subtraction image shows only the blood vessels important to the examination. A control device directs the storage of data in the digital semiconductor memories. The memories contain data for successive images and, when full, may be overwritten by subsequent image data.

Abstract: In an exemplary x-ray generator with several focal spots, a supply device for energizing the heating filaments for the respective focal spots comprises a single filament supply transformer for all heating filaments with which generator circuitry for supplying different frequencies is connected, and one filter each is connected between each heating filament and the secondary winding of the filament transformer. The pass bands of the filters correspond to the different generator frequencies.

Abstract: A pinhole camera forms an image of the optical focal spot of an x-ray tube on a radiation-electrical transducer comprising an intensifier foil and a matrix of photo-sensitive detectors. A processing circuit including an adjustable amplitude selector selects detector output signals for transmission to a video monitor. A calibrated measuring grid can be superimposed on the focal spot image on the monitor.

Abstract: In an exemplary embodiment, a medium frequency generator is mounted on the rotating frame together with at least one x-ray tube, preferably, however, a plurality of x-ray tubes. The x-ray tubes are grid-controlled and, together with their filament transformer are provided in one separate housing each. A grid control circuit is connected with the component parts on the rotating frame.

Abstract: In an exemplary embodiment, a cathode cup for electron focusing has a groove-like cavity for the heater coil. The cathode cup is subdivided, approximately perpendicularly to the longitudinal direction of the heater coil into several parts which are insulated from one another, to which separate control potentials can be supplied.

Abstract: In an exemplary embodiment a variable ohmic resistance in the high voltage circuit of the x-ray tube is formed of a series of individual resistors which can be individually bridged by means of electronic switches. There can be connected, in parallel with at least one individual resistance, a series of fine adjustment resistances which can be individually bridged by means of further electronic switches.

Abstract: In an exemplary embodiment, an exposure time selector and a mAs relay are connected to a computer which controls the x-ray tube current according to the selected mAs product and the freely selected value of exposure time. For example, the exposure time may be set to any of a range of analog values for determining exposure time, while the mAs relay is disconnected from the exposure termination switching circuit.

Abstract: In an exemplary embodiment, an mAs relay having selector keys and also a digitally operating manual control for selection of mAs products is capable of being switched over for digital selection of the exposure time independently of later radiographic current selection. For this purpose, the input of the mAs relay is capable of connection to an auxiliary current source which delivers a constant auxiliary current. The operating threshold of the mAs relay is then adjusted by the digital selection of exposure time. For the purpose of overload protection, a power circuit can be present which in a step-by-step fashion reduces the x-ray tube power via the x-ray tube current to a permissible value when preprogrammed times, e.g. planigraphic exposure times provided for planigraphic operation, are exceeded for the given settings of radiographic current and voltage.

Abstract: The inverter utilizes an LC oscillatory circuit and a switching device for the alternate connection of this oscillating circuit to a d.c. voltage source. Adjustment circuitry is present for the adjustment of the capacitance and/or inductance of the LC oscillatory circuit. Through this circuitry, the inverter is adaptable to different load conditions.

Abstract: In the exemplary embodiments, the x-ray tube current is controlled in such manner that the desired x-ray tube voltage is established on the basis of the voltage drop in the supply circuit of the x-ray tube. For the adjustment of the x-ray tube voltage, in addition to the control means for the x-ray tube current in the primary circuit of the high voltage transformer, a circuit is present for altering the primary voltage of the high voltage transformer.

Abstract: In an exemplary embodiment an inverter manifests a circuit for the alternate connection of the terminals of an LC oscillatory circuit with the poles of a d.c. voltage source. The primary winding of the high voltage transformer is connected in series with the capacitor to form the LC oscillatory circuit. By this means, a short-circuit proof state of the inverter results.

Abstract: The inverter delivers a supply frequency for the high voltage transformer which lies in the kHz-range. There is connected to the input of the inverter a smoothing circuit which is fed by a mains rectifier. There is series connected to the smoothing circuit a phase gating control for controlling the duty cycle of the pulses supplied to the smoothing circuit and thus for controlling the x-ray tube voltage.

Abstract: In an exemplary embodiment, two inverters of which each exhibits a switching installation controlled by a control circuit for the alternate connection of two output lines with the power rectifier. The control signals supplied to the inverters by the control circuit are out of phase with one another, so that the x-ray tube voltage possesses a low ripple component.