PRESSURE MEASURING FACILITY Russian patent published in 2003 - IPC

FIELD: instrumentation, measurement of pulsating pressures in technical diagnostics systems of explosive gas compressing equipment. SUBSTANCE: pressure measuring facility includes differential inductive primary measurement converter which ferrite core is coupled to springy element and secondary measurement converter connected with output to diagnostics system connected in series. Secondary measurement converter has controllable self-excited high-voltage oscillator with oscillatory circuit connected to output of primary measurement converter and high-frequency amplifier equipped with source of constant bias voltage connected with output to transformer whose secondary winding is connected in power supply circuit with primary measurement converter which output is connected via feedback line to input of oscillatory circuit. Amplitude detector fitted with RC filter and connected to one input of operational amplifier whose second input is connected to source of constant bias voltage is connected to output of amplifier. Output of operational amplifier and another output of source of constant bias voltage are connected to contacts of secondary measurement converter sending output signal and output of operational amplifier is connected to one input of comparator whose second input is connected to output of amplifier through forcing link. Output of comparator is connected to inputs of two formers of short pulses of rectangular shape, their outputs are connected through matching resistors to adder of their currents, to third winding of transformer via matching resistor which convert compensating feedback circuit to oscillatory circuit. Technical result of invention consists in design of new circuit of measurement converter of high-frequency input signal to D C output bipolar signal proportional to it which ensures linearity of functional dependence of measurement conversion, suppression of action of interference on outside communication line and distant transmission of signals. Formation of resulting current of main feedback on high frequency resistively isolates primary measurement converter from outside circuit by direct current which admits its installation on explosive objects of control over technical condition. EFFECT: possibility of installation of primary measurement converter on explosive objects. 4 dwg