Showing papers on "Impulse generator published in 1976"

Present capabilities of the NBS Automatic Pulse Measurement System

Abstract: In 1972, NBS began development of an Automatic Pulse Measurement System (APMS) consisting essentially of a minicomputer-controlled wide-band sampling oscilloscope. The objective of the work was to produce a fast general purpose pulse waveform acquisition and processing instrument with spectral capability in the frequency range dc-18 GHz. The purpose of this paper is to report the highlights of work done on the APMS from early 1975 to present. The measurement applications of the APMS now consist of both publicly offered calibration services and in-house experimental measurements. In the first category, calibration services are available for the following physical parameters: a) Impulse generator spectrum amplitude; b) Wide-band coaxial attenuation/gain; c) Pulse generator transition time. Still in the experimental stage are measurements involving reflection coefficient and impedance, group delay, pulse distortion, and wide-band antenna characteristics.

Locating of intracorporeal catheters already in place - using impulse generator linked to skin mounted electrodes

Abstract: A device for the accurate position finding of already innerted intracorporeal catheters plastic heart and vessel catheters produces direct-current impulses which are introduced into the patient by means of electrodes attached to the skin. The location of the catheter tip is then done by means of a commercial E.C.G. machine, such that the electrical potential between the catheter tip and the skin mounted electrode is detected by the E.C.G. machine. The positioning device may also produce various forms of alternating current impulses which allows usage of several electrical fields simultaneously if any one impulse type is transmitted only by specific skin mounted electrodes.

Film frame counter for camera - has impulse cover at top and counter devices coupled to film transport and display systems

Abstract: The device is for indicating the frame number of a film in a camera with a filter transportation system, and has an impulse generator which produces at least one single impulse when the film transportation system has been completely operated. This impulse generator is connected to an impulse counter which counts the impulses generated by the impulse generator device during film transport. An indicator is provided to display, in an optical manner, the status of the impulse counter, typically a forwards-backwards counter.

Bionic speech equipment for laryngotomy patients - uses impulse generator as separate unit from pharyngonasal sound vibration vibrator

Abstract: The speech equipment for laryngectomy patients consists of an impulse generator which can be switched on or off and a vibrator connected to it which can be pressed onto the neck producing sound vibrations in the pharyngonasal cavity, whereby the vibrator forms a separate unit from the impulse generator and is fastened by a clip or similar device onto the neck of the patient. Pref., the vibrator is formed on electro magnetic principles with a diaphragm as armature with the armature coupled to the housing. The switch for the impulse generator is also formed as a separate unit.

Tempo display for electronic rhythm device - has impulse generator producing optical displayed signal indicating start of rhythm pulse

Abstract: An indicator device for tempo and/or rhythm in an electronic rhythm, device, having an optical display with an impulse generator which produces an impulse at the commencement of the rhythm, and which operates the display to optically notify the commencement of consecutive rhythm pulses, is constructed such that the impulse generator produces impulses for each rhythm reflecting the sum of the rhythm components. These impulses activate the display such that the device displays not only the start of the first component but also the start of further components of one or more rhythm, in an optically separable manner.

Regulating installation for power transmitted to a three-phase user

Abstract: A regulating installation for the power output conveyed to a three-phase user; including switches transmissive in both current directions having triggering characteristics, with the switches being positioned in two of the three power supply phases; first and second impulse generators; and an element transmitting a control signal to the impulse generators dependent upon the difference in the actual value and a reference value of the power output being regulated. Each of the impulse generators has, respectively, one switch associated therewith, the generators each being synchronized by a power supply phase and transmitting a triggering impulse to its associated switch. The first impulse generator is synchronized through a T-phase uninterruptedly applied to the user, and the second impulse generator is synchronized through an R-phase connected thereto by the switch associated therewith.

Coherent impulse doppler radar system - designed esp for low impulse sequence frequency and suppressing slow ground echo signals

Abstract: The objective is a radar sytem which blocks echo signals from ground vehicles and provides accurate information relating to the location of relatively fast air targets. The system has a send/receive unit whose sender unit is triggered by an impulse generator which generates sequentially groups of trigger impulses, each with a sequency frequency differing from that of the previous group. The sender accordingly generates radar output impulses whose sequence frequency changes during a target delay period i.e. the period required by the antennae to scan the target. The reflected echo signal received by the antennae is fed through the unit's receiver to a digital clutter-attenuation band-comb filter and control circuit.

Low voltage impulse testing of power transformers.

Abstract: 1 I Present Transformer Testing Techniques ... 4 II Low Voltage Impulse Testing 32 III Frequency Domain Analysis 56 IV Application of Frequency Domain Analysis Techniques to Low Voltage Impulse Testing of Power Transformers. . 84 V Conclusions and Recommendations 98 \ Bibliography 103

Safety brake light control - uses impulse generator coupled to brake light with frequency determined by retardation

Abstract: The retardation of the vehicle is monitored and is used to control the frequency of an impulse generator coupled to the brake lights. The following vehicles can thus judge the amount of braking accurately. The retardation signal is derived in one of several simple ways translated into a signal level and stored in a reference capacitor. The stored value is then compared with a second value, after a set time interval, with the difference in levels proportional to the retardation. The brake pressure can be directly used to modulate the frequency of the impulse generator, as can the displacement of an inertial mass.

Electrical diagnosis and treatment of inflammatory tissue - negative electrode laid on inflammation focus to destroy bacteria

Abstract: A negative electrode (17, 18, 19) is laid on the focus of the inflammation to be treated and a positive electrode (10) applied to a remote point of the body thus producing an electrical direct voltage. Pref. the direct voltage is of low frequency impulses with an impulse ratio of 1:10 to 1:1 and a voltage of at least one volt. An operational amplifier (1) charged from a dc source (2) and regulated by a low frequency impulse generator circuit has a Darlington amplifier as impedance transformer coupled to it, whose emitter output has the positive electrode (10) coupled to it whilst the negative electrode (17, 18, 19) is connected to the negative pole of the d.c. source (2).

Electronic rhythm production device - is fitted with programmable selector switches with augmentation circuit and uses impulse generator

Abstract: An electronic rhythm device having an impulse generator the output impulse of which produces a periodically repeated series of various notes and/or chords by means of selector switches of selectable programme in the control leads of automatic rhythm units or controls for an automatic accompaniment device, has an acceleration or augmentation circuit (26) to which a number of selector switches (12-16) are attached. The augmentation circuit (26) can be altered by means of the programme selected on the selector switches (12-16).

Impulse generator spectrum amplitude measurement techniques

Abstract: Various techniques that have been used to calibrate impulse generators and to measure spectrum amplitude are surveyed. A summary of experiments comparing the various techniques is included. The NBS measurement service for calibrating impulse generators is described.

Remote controlled multi stage speed regulator - has impulse generator and vehicle mounted receiver giving audible warning and interrupting ignition

Abstract: The design enables the speed of motor vehicles to be controlled externally so that speed limits cannot be exceeded. The speedometer dial has a circular slot in which the switch ring fits. The lower part of the ring has a short low voltage collector and a long low voltage collector. An external sender emits an impulses signal to a receiver in the vehicle. This alters mechanically the position of the switch ring. When the needle exceeds the permitted setting, a relay in activated by the short current collector to sound a horn in the vehicle. The long collector then activates a relay to break the ignition circuit.

IC engine fuel injection system - has electronic control with timing variation unit for cold start conditions

Abstract: The engine has four solenoid operated fuel valves whose coils are energised by an output amplifier. The control system has a crankshaft driven timer feeding an impulse generator which feeds a frequency divider stage supplying a multivibrator. The output of this feeds an impulse prolongation unit with a voltage regulator which supplies the output amplifier. The output of the multivibrator is controlled by the signal from an air flow detector in the engine air inlet. The duration of the pulse is prolonged in the prolongation unit which is supplied with controlling inputs from a load detector an engine temperature detector and an engine starting signal generator which produces a signal for a set period after the throttle has been closed.

Railway wagon bearings temperature monitor control - has transmission elements consisting of cable conductors with dividing elements for multiple usage

Abstract: The control is for temperature monitors, which issue alarm signals at critical temperatures, for the axle-and wheel set bearings of railway wagons. It has wire-connected transmission elements between the control plant in the drivers cabin, and the individual monitors. The transmission elements consist of in-use conductors of the UIC cable. There are dividing elements for the multi usage. Each unit of monitors (AltU) has an associated individual identification, which may be registered by enquiry impulses. The control (ZSt) has an impulse generator (SEN) to issue test impulses for the function monitoring of the temperature monitors. To identify the appliances to be tested, the generator issues enquiry impulses to record the identifications of all appliances, before the testing processes. Each temperature monitor has a connected impulse receiver, to receive enquiry- and test impulses from the impulse generator impulse appliance (UTR), issuing return impulse to an impulse receiver (SEN) of the control.

Alarm cct. for battery driven device - has load capacitor with pulse generator and transistors

Abstract: The alarm circuit connections are made to an alarm contact from an impulse generator through a delay unit. The control element consist of a bistable switching element connected to the pulse generator through a capacitor. The delay circuit is constructed from a load capacitor in parallel with the collector-emitter side of a transistor. The circuit operates from a 1.5 volt battery. Pulses developed are square in profile with a long initial pulse gradually reducing in length until a regular pattern is formed.

Electromagnetic impulse generator for electricity meters - has Hall generator detector head

Abstract: The impulse generator comprises a rotating magnetic disc (16) attached to the underside of a flat plate (2) fixed to the shaft (1) of the meter. A second magnetic disc is fixed to a carrier attached to the body of the instrument which forms a needle bearing (11). The gap between the two magnetic discs is adjustable by means of a screw thread and clamping collar (9). An arm (14) placed in the vicinity of the outer magnetic pole of the rotating disc carries a Hall generator with ferrite magnet element (17). An electrical impulse is available at the output of the Hall generator for each complete revolution of the shaft. Under no-load conditions of the electricity supply, the assembly assumes a stationary position.

Spinning unit productivity monitor - uses combination of impulse counter and timer to give digital display of throughput

Abstract: The appts. is used to measure the length of material processed by a spinning machine, whether the spun or twisted yarn, or the sliver input, either of staple or continuous fibre material. The material being measured rotates an impulse generator as it is being advanced, the impulses being repeated by a counter and added with a timer to indicate the length measured in a particular time unit, or the delivery speed. The system gives an accurate measurement of the spinning unit's productivity, which is easily read.

Step motor control system - has impulse generation and selection according to program for sewing machine

Abstract: An appts. is claimed for the control of a step motor, partic. for a sewing machine, with a drive circuit to generate activating signals to the step motor. A store holds the information on the number of impulses and the impulse sequences for the drive circuit to pass on successively. A reader extracts the stored information data, while a decoder establishes the number of impulses in a sequence. An impulse generator delivers a frequency, selected from an available number of frequencies, to match the decoded impulse information. The generated impulses are fed to the drive circuit where a digital unit stores the number of impulses through the decoded impulse sequence, with gates to end the impulse supply when the number of fed impulses matches the stored number of impulses. The system provides a simple method of activating the motor to operate at a given and determined number of rotations, at high speeds, with a positive stop action without requiring absorbers for vibration.

Cinematographic camera with electronic shutter/control - has internal light source and impulse generator to control illumination of light measuring sensor

Abstract: The cinematographic camera with electronically controlled shutter and diaphragm devices has a stepping motor and impulse generator with a light source (31) coupled to the switching circuits (29, 28', 35) in an impulse controlled in and out manner by means of which the light measurement sensor (7) is illuminated during the fade in phase in a pulsed manner. The strength of the light source (31) is so selected that it has an illuminating power which does not exceed the illumination level falling on the light sensor (7) in normal circumstances and that the start and duration of each light impulse can be adjusted.

Rhythm production unit of electronic design - has storage capacitor on oscillator input with cut-in switch

Abstract: The electronic rhythm has an impulse generator the impulse of which is linked to mechanical or electronic accompaniment instruments or automatic devices which fulfil the function of left hand playing, and the control and impulse frequency/velocity of which determines the tempo of the accompaniment, such that the impulse generator has oscillator controlled by a control voltage It has a storage capacitor (7) attached to the control input (4) of the oscillator (1) which can be bought into circuit by a switch (8) at a set voltage

Pulse generator with frequency and pulse width modulation - used for setting control voltage level

Abstract: The circuit is used for setting the level of a direct voltage to be used for reference or control purposes by varying its pulse width. The impulse generator works over a wide range of frequency and pulse width, and has the characteristics of a self resetting integrator. It generates an output signal which is dependant on the level of the input voltage, the output being used to switch a controller on and off thus regulating the average value of the quantity to be controlled. The circuit may be used in a control loop and derive its input voltage from an error signal.