SU663107A1 - Parametric physical value-to-voltage converter - Google Patents

Description

(54) PHYSICAL VALUE MEASURING CONVERTER FOR VOLTAGE

The invention relates to pulsed technology, in particular devices used to convert physical quantities into electrical voltage. These devices are used to measure the pressure fields of shock waves in various traces of seismic waves using measuring manganin piezoresistive transducers (MSD) with pulsed power, dynamic deformation waves of objects using measuring tensor-resistive transducers, as well as during the formation, in particular, when shortening pulsed signals, h

Physical-to-voltage measuring transducers are known that are used in experimental studies of an explosion and its effect on objects consisting of a recorder, a generator of rectangular feed current pulses, a manganin piezoresistive transducer, matching resistances and communication lines. The current pulse generator and the recorder through the corresponding communication lines are the matching Resistances Connected to the MPRM experiencing shock 1.

However, the measurement of the signal under study, when it is located on the flat vertex of the signal-stand pulse, occurs with great error. The dynamic range of the recorder is mainly loaded with information about the parameters of the pedestal signal, i.e. the power pulse. The information on the signal under investigation occupies only a small dynamic range of the dynamic range, therefore, the distortions of the signal under investigation increase simultaneously with the increase in the error.

0 measuring its parameters.

A physical-to-voltage measuring transducer is also known, consisting of a recorder, a power current pulse generator, a parametric transducer, a line.

5, a matching resistor, a stand-by block generator with an emitter connection and a trigger circuit, in which the outputs of said generator and converter are connected to the matching resistor 2 via a communication line.

Claims (2)

However, this device produces distortions of the signal under study during its registration due to the power pulses input to the recorder. The purpose of the invention is to reduce the distortions of the signal under investigation due to the pulsed power of the MPRM input to the recorder input, which prevents its dynamic range from being loaded with useless information during the time of action of the signal under study. This is achieved by the fact that in a measuring transducer of a physical quantity into a voltage, consisting of a recorder, a generator of current supply pulses, a parametric converter, a communication line, a matching resistor, waiting for a blocking generator with an emitter connection and a circuit circuit, in which the outputs of the generator and converter through the communication line are connected with a matching resistor, one common point of the outputs of the generator of the pulses of the power supply current and the parametric converter through the input to the condensation device the torus is connected to one input contact of the recorder and collector of the transistor, blocking generator, the input circuit of the block-generator generator is connected to the synchronization output of the power supply current pulse generator and another common point of the outputs of the mentioned generator and converter and the other input of the recorder KOHTaKt recorder are blocked to the transistor emitter circuit -generator. The drawing shows a schematic diagram of the proposed device. The measuring transducer consists of MPRP 1, communication line 2 with a matching resistor 3, a pair of signals that are generated by a power supply current pulse 4, a capacitor 5 connected between the input contact of the recorder 6 and the connection point of the resistor 3 and the generator 4. Parallel to the input contacts of the registrar 6 A stand-by blocking generator is included, which contains a transistor 7, a pulse transformer 8 and a start circuit consisting of a resistor 9 and a capacitor 10. A capacitor 10 is connected between the resistor 9 and the clock output of the generator 4 .. stroystvo works as follows. In the initial state, the current of the generator 4 is absent and the voltage drop across the capacitor 5 is zero. The transistor 7 is waiting for the blocking generator is closed. When the generator 4 is triggered, the impulse current of the power supply 3 and the impulse of the current 3 comes through the communication link 2 through the MPID 1. a small part of which (since R, where R (. is the matching of the resistor 3) branches into resistor 3. On the matching resistor 3, the voltage of the stand Li signal is applied through the capacitor 5 capacitor to the collector of the waiting transistor 7 and To the input of the recorder 6. At the same time, the output of the synchronization of the generator 4 is a signal coming through the trigger circuit 10-9 and the base winding of the transformer 8 to the base of the transistor 7, opening it. A regenerative process occurs in the waiting blocking generator, as a result The transistor 7 goes into deep saturation mode. The capacitor 5 capacitance is charged by the high collector current of transistor 7 to the voltage, then the blocking generator is turned off, the collector current of transistor 7 is reduced to the reverse uncontrolled collector current. From this moment on, the input resistance of the transistor 7, the collector circuit increases by several orders of magnitude, from hundreds of ohms to hundreds of kilo. From the moment of locking the blocking generator, the voltage at the input of the recorder 6 decreases to zero. The process of charging the capacitor 5 takes about 10 seconds and ends before the signal under investigation appears on the MPDI. In accordance with the progress of the capacitor 5 capacitance charging process, a short bell-shaped signal is recorded at the initial part of the oscillogram recorded by the recorder 6, the amplitude of which does not exceed the value of Di ,. At subsequent points in time, up to the arrival of the signal under study, zero voltage is recorded on the oscillogram. G of the moment of the beginning of the interaction of MPRP with the investigated shock pressure on the converter, an information analog signal is generated, which through the matched line 2 and the capacitor 5 is led to the input of the register 6. The transmission circuit of this investigated sigiafta does not introduce distortions, because the transistor 7 of the waiting blocking generator is locked. From the moment you lock the blocking generator, the dynamic range of the recorder 6 is not loaded with useless information. Thus, switching on the capacitor 5 reduces the distortion of the signal under investigation by preventing the loading of the dynamic range of the recorder 6 with useless information. The invention of a physical variable-voltage transducer. The voltage consists of a recorder, a generator of current supply pulses, a parametric converter, a communication liaison, a matching resistor, a stand-by blocking generator with an emitter connection and a trigger circuit, in which the outputs of the said generator and A converter is connected to a terminating resistor via a link, characterized in that, with a target. reducing the distortions of the signal under investigation, one common point of the outputs of the generator of the pulses of the power supply and the parametric converter through a capacitor temporary into the device connected to one input contact of the recorder. 5 I and the collector of the blocking transistor, the start circuit of the blocking generator is connected to the clock output of the power supply pulse generator, and the other common point of the outputs of said generator and converter and the other input contact of the recorder are connected to the emitter circuit of the blocking transistor generator. Sources of informavdi taken into account during the examination of iGt-od- Dennis E., A constant Curreni source rg mangranin gotnge-biennially SciRe-viEw Science 3ns-lruments .40, 1969, No. 11, pp. 1399-402. 2. Copyright certificate N 395981, CL. H 03 K 17/30, 1971. -A