A method of measuring the displacement
(57) Abstract:The invention relates to the field of automation and can be used to convert non-electrical quantities in an electrical signal. The technical result is to increase the accuracy. The method is based on the fact that the form of the reference signal with a known spectrum, determine the range of the output signal, compare the spectra of the reference and output signals and, if they are identical, is determined taking into account the inverse Fourier transform spectrum of the excitation signal. 1 Il. The invention relates to locating method of converting non-electrical quantities in an electrical signal, namely, the measuring device is moved.Known location method based on measuring the travel time of the measured displacement (distance) radiation, the speed of which is known and remains unchanged during the measurement process [see Spector, S. A. Electrical measurement of non-electrical quantities: measurement Methods: Educational. manual for schools. HP: Energoatomizdat. Leningrad. separa-tion, 1987, S. 172-178].The disadvantage of this method is the low accuracy due to the heterogeneity of the properties along the length of the sections ol the Directors (temperature and so p. ), which leads to changes in the velocity of propagation of the radiation and the dependence of its time and coordinates.Closest to the invention is also a locating method for motion measurement based on measuring the time of passage of the elastic wave section of the waveguide is equal to the measured displacement, from the moment of its initiation until the reception, in order to obtain high precision measurements of the shape of the excitation signal is chosen such that the output signal after passing through the waveguide path had maximum amplitude under normal conditions, and for one of the characteristic points of the output signal, we take the point of maximum [see Artemiev E. A., Druzhinin Century A. optimization of the shape of the probing signal magnetostrictive linear displacement sensor. Abstracts of all-Union scientific-technical conference "Theory and practice of simulation and create simulators". M. : 1985. - 95 S.] (hereinafter, the characteristic point will be called a point of reference level).However, the accuracy of this method is also low due to the action of influencing factors on the properties of the waveguide path and, consequently, the speed of propagation of the light.It is known that the incorporation method of measuring the time interval t between the characteristic points of the excitation signal SVASB(t) and the output signal SO(t) depends keemah complex frequency response K():
When the wave propagation in the waveguide due to the heterogeneity of its properties along the length, different length of the section of the waveguide, the phenomena of dispersion and changes of parameters of the medium of propagation of the radiation caused by the action of influencing factors (temperature, etc.), changes of the complex frequency response K() section of the waveguide:
< / BR>where SO() and SVASB() - respectively the spectra of the output signal and the excitation signal;
x - measured displacement [m];
- ambient temperature [oI];
with the average speed of wave propagation on the section of the waveguide in the current time [m/s].When you change To() eventually change the shape of the output signal and its spectrum) and accordingly the position of the characteristic points in time relative to the characteristic points of the excitation signal, resulting in measurement errors.Characteristic points (XT) input and output signals may be the position of their extremum on the time axis, the moments of their passage through zero, the position of the point on their fronts corresponding to a certain percentage of the amplitude, combinations thereof, etc.,
the position of the characteristic point on the time axis for the output signal will be constant and at a constant position of characteristic points of the excitation signal time interval t is uniquely determined measured move:
The current value KCH Ki(a) plot of the waveguide path corresponding to the measured displacement x at the current time t, must comply with the following range of excitation signal:
< / BR>The spectra of the excitation signal SVASB() and the output signal SO()=SFL() correspond to the signals which form taking into account the inverse Fourier transform is:
< / BR>The spectrum of the received signal due to the delay while passing through the waveguide path (range delayed signal) will be:
< / BR>where SWYH(a) spectrum of the output signal received in the system in the absence of displacement of the receiver relative to the emitter (ti);
ti- the period of time between the launch and reception of the signal [s].
1. Spector, S. A. Electrical measurement of non-electrical quantities: measurement Methods: Educational. manual for schools. HP: Energoatomizdat. Leningrad. separa-tion, 1987, S. 172-178.2. Artemiev E. A., Druzhinin Century A. optimization of the shape of the probing signal magnetostrictive linear displacement sensor. Abstracts of all-Union scientific-technical is>Method for motion measurement, implemented waveguide path, consisting of a waveguide, shaper of the excitation signal and the receiver, namely, that form the excitation signal, to excite a wave in the waveguide, take wave after passing through the section of the waveguide is equal to the measured displacement, and convert the wave into an output signal, characterized in that the form of the reference signal with a known spectrum, determine the range of the output signal, compare the spectra of the reference and output signals and, if they are identical, is determined taking into account the inverse Fourier transform spectrum of the excitation signal, calculate the complex frequency response plot of the waveguide path corresponding to the measured movement at the current time, as the ratio of the spectrum of the output signal to the spectrum of the excitation signal, calculate the range of the new excitation signal as the ratio of the spectrum of the reference signal to the mentioned complex frequency response and repeat the cycle of measurement, the measured displacement corresponds to the time interval between the characteristic points of the excitation signal and the output signal when the identity of the spectra of the output and atalo the
FIELD: digital technology; conversion of analog voltage to digital code.
SUBSTANCE: proposed converter has differential amplifiers, comparator, dc amplifier, analog memory device, control device, serial-to-parallel code converter, modulo M counter, switches, inverter, and input stage for determining polarity and inverting negative voltages.
EFFECT: enhanced bit capacity at high speed and simple architecture of converter.
1 cl, 2 dwg
FIELD: computer engineering; automation, data processing and measurement technology.
SUBSTANCE: proposed converter has two registers, NOT gate, angle-code-to-sine/cosine-code functional conversion unit, two digital-to-analog converters, reference voltage supply, pulse generator, counter, two capacitors, subtracting amplifier, two modulators, threshold unit, two selector switches, two buffer followers, threshold voltage supply, comparison circuit, D flip-flop, and reference code shaper; all these components enable functional control of converter during recording pulse time and supply of signal indicating normal or abnormal operation of converter to user thereby essentially raising its self-control ability and yielding profound and reliable information.
EFFECT: enhanced comprehensiveness of control and reliability of converter output data.
1 cl, 2 dwg
FIELD: electronic engineering.
SUBSTANCE: device has a setoff transducers kinematically connected to gantry shaft, angular information transformer, code transducer, adder, control unit, clock pulse oscillator, delay circuit, binary pulse counter, two static registers, digital comparator line and RAM unit.
EFFECT: high transformation accuracy.
FIELD: electronic engineering.
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EFFECT: eliminated ambiguity in reading coordinate code; high performance and accuracy.
3 cl, 6 dwg
FIELD: computer engineering; data processing devices.
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EFFECT: enhanced precision characteristics of converter.
1 cl, 1 dwg
FIELD: computer engineering.
SUBSTANCE: proposed device that can be used in high-reliability computer-aided monitoring, data processing and acquisition systems has two analog-to-digital converters, two switching units, two sensors, and control unit. This device is characterized in low failure probability, reliability of conversion when implementing structure of analog-to-digital computer capable of operation in two modes of parallel and/or serial polling of sensors, and in ability of its on-line reconfiguration in the event of failure by self-check results of each analog-to-digital converter.
EFFECT: enlarged functional capabilities, extended mean time between failures, reduced maintenance charges.
4 cl, 6 dwg
FIELD: computer science.
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EFFECT: higher precision, higher speed of operation.
FIELD: control systems.
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EFFECT: higher speed of operation.
FIELD: computer engineering; angle-of-turn-to-code converters and data processing systems.
SUBSTANCE: proposed converter has synchro resolver transducers, switching unit, four integrators, voltage-to-code ratio functional converter, threshold elements, 4AND-NOT gate, integrator start and stop unit, counter, two inverters, two selector switches, and NOT gate.
EFFECT: enhanced speed of converter.
1 cl, 2 dwg
FIELD: measuring equipment for information controlling of predetermined tillage depth.
SUBSTANCE: apparatus has primary information sensor with two sensitive members connected to different circuits of digital RC-generator of rectangular pulse connected in series with frequency divider and with frequency meter, control unit, reference signal generator, two differential amplifiers, demodulator, comparison circuits and two actuating mechanisms. Control unit is connected to RC-generator, frequency meter and reference signal generator. Actuating mechanism is connected through comparison circuit to demodulator whose inputs are connected through differential amplifier to frequency divider and reference signal generator. Output signal is determined from formula.
EFFECT: increased precision and wider operational capabilities of automatic controlling of predetermined tillage depth.