SU1335864A1 - Method of checking acoustic devices for serviceability - Google Patents

Abstract

The invention relates to the field of acoustic methods for measuring distance and medium properties in a pulsed mode and can be used to monitor the performance of acoustic devices, such as liquid and gaseous medium analyzers, distance numbers or level gauges. The aim of the invention is to improve the reliability of monitoring the operability of acoustic devices by monitoring the operability of both the electroacoustic transducer and the measurement circuit. Both in the first and in the second time interval of the monitoring cycle, the time interval between the pulse that passed the medium being sounded and the next probe iM pulse is measured, and in one time interval the probe pulse is shifted by a stable period of time relative to the probe pulse in another time interval , compare the measured time intervals and determine the serviceability of the device by the comparison result. When establishing the fact of failure, auxiliary pulses, simulating an acoustic signal, are carried out at the input of the measurement circuit, similar measurements are made, and the measurement result is judged by the comparison result. c: S (L s 00 00 el 00 O) 4

Description

The invention relates to acoustic methods for measuring distances and properties of a medium in a pulsed mode and can be used to monitor the performance of acoustic devices, such as liquid and gaseous medium analyzers, range finders or level gauges.

The purpose of the invention is to increase the reliability of monitoring the operability of acoustic devices by monitoring the operability of both the acoustic transducer and the measurement circuit.

The method is carried out as follows.

The measurement circuit is supplied with pulses passed through the sounding medium. In each interval of one of the control cycles consisting of two time intervals, each of which is enclosed between two probe pulses, the interval of time between the pulse passed through the medium and the probe pulse following it is measured, and in one of the cycle intervals one probe the pulse is shifted relative to the other for a stable period of time, compared with each other and based on the comparison results — the control signal determines the degree of health or malfunction of the device.

When a malfunction is established, the devices stop the flow of the measurement circuit of pulses that absorb the medium being heard, and auxiliary pulses are fed to its input, one at each of the time intervals of the control cycle, remote from the preceding probe pulses for equal lengths of time. The time interval between the auxiliary pulse and the pulse following it is measured at each interval of the monitoring cycle. The measured time intervals are compared with each other and, based on the comparison results, they judge the health of the measurement circuit.

The method allows testing of the acoustic transducer both in the transmission mode and in the reception mode due to the impulse of the learning medium that has been lost. The same impulse is involved in the formation of time intervals in the control cycle, with the help of which it is tested stable.

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conversion ratio and drift of the measurement circuit. These parameters characterize its state and can be used to judge the degree of a device’s health (failure or deterioration of metrological characteristics). In the event of a device failure, a measurement circuit is checked, the positive control results of which indicate a malfunction of the acoustic transducer.

Claims (1)

The method makes it possible to increase the reliability of monitoring the operability of acoustic devices in the process of operation due to the participation of all its nodes in it and to reduce the cost of checking and finding the failed node. Invention Formula A method for monitoring the operability of acoustic devices, including the supply of probe pulses to an acoustic transducer and the determination of a control signal by a measuring circuit, characterized in that, in order to increase the reliability of the control, pulses passed through the measuring medium are fed to the measurement circuit in each interval of control cycles consisting of two time intervals, each of which is between two probing pulses, the length of time between the pulse that passed through the medium, and a probe pulse following it, in one of the monitoring cycle intervals, one probe pulse is shifted relative to the other for a stable period of time, the measured time intervals are compared with each other and the device’s health condition or device malfunction is determined by the results; on the measurement circuit im. . pulses that have passed through the sounding medium, and serves auxiliary pulses one at each time interval of the control cycle, remote from the probe pulses preceding them for equal lengths of time, measured in each interval of the control cycle, the length of time between the auxiliary and following probe pulses, measured periods of time are compared with each other and, based on the results of a comparison, a judgment is taken on the serviceability of the measurement scheme.