RU1791722C - Device for measuring parameters of medium in the reservoir - Google Patents

Abstract

Usage: the invention relates to measuring technique and can be used to measure the density and level of the medium in tanks and pipelines of various industries. SUMMARY OF THE INVENTION: the device comprises an ultrasonic transducer mounted on a capacitor, a generator, a timer, an amplitude limiter, and so on, a digital transducer, a time selector, and random access memory. 2 il ..

Description

The invention relates to measuring technique and can be used for rapid analysis and in devices with automatic process control in various industries.

An ultrasonic level switch is known, the operation of which is based on recording changes in the density of the medium in the tank, containing an ultrasonic transducer mounted on the side wall of the tank, an amplifier, a shock excitation generator, a timer, a time and amplitude selection circuit, and an information processing circuit.

The disadvantage of this device is the low reliability caused by the complexity of the circuitry for the conversion of information built on analog nodes.

Closest to the claimed device (prototype) is an ultrasonic annunciator of the density of the medium in the tank, containing an ultrasonic transducer mounted on the tank, a shock excitation generator connected to the output of the transducer, two time selectors, two RS-flip-flops and a timer, the timer being connected the first output to the input of the generator and the S-input of the first trigger a, the second to the input of the first selector, the third to the input of the second selector, the output of the first selector is connected to the R-input of the first trigger and the S-input of the second flip-flop, the first flip-flop output being connected to the second WMOs row of the second selector and the second selector output is connected to the R-input of the second flip-flop, the amplitude limiter and a comparator, whose output is connected to the selector input, and input - with the output of the limiter, the input limiter is connected to the converter.

The disadvantage of this device is the inability to have continuous information about changes in the density of the medium. - -; - - .., ... ..., .... :,. : -,;

The purpose of the invention is to improve precisely. sti measurements.

The goal is achieved by the device for determining the parameters of the medium in the tank,

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comprising an ultrasonic transducer, a shock excitation generator, an amplitude limiter, the input of which is connected to the transducer, a timer and a time selector, one input of which is connected to the second output of the timer, and the first .xx ° D timer is connected to the input of the generator. th, the input circuit of the generator is connected to the converter, an analog-to-digital converter (ADC) is introduced, with an input 5 And an amplitude limiter connected; the ADC output is connected to another input of the temporary selector, random access memory (RAM), the input of which is connected to the output of the temporary selector, a maximum allocation circuit (CBM), the input of the connection to the output of the temporary selector, and the output is connected to the write enable address of the RAM.

Comparison of the claimed solution with other technical solutions shows that the introduction of the ADC, RAM and SVM with the connections indicated in the diagram allows you to continuously have information on the change in the density of the medium in the capacitance in digital form, which extends the functionality of the device. This allows us to conclude that the technical solution meets the criterion of significant differences.

Figure 1.2 presents a functional diagram of the device.

An ultrasonic meter of the parameters of the medium in the vessel contains an ultrasonic transducer 1 mounted on the vessel 2, a generator 3, the output of which is connected to the transducer, a timer 4, the first output of which is connected to the generator input, an amplitude limiter 5, an ADC b and a time selector 7, one the input of which is connected to the second output of the timer, and the ADC output is b, the input of the ADC 6 is connected to the output of the amplitude limiter, RAM 8, the information input of which is connected to the output of the temporary village. Ctor, CBM 9, the input connected to the output temporal selector and output - to the input of the RAM 8 write enable.

The device operates as follows.

From the first output of timer 4 of generator 3, synchronization pulses periodically arrive. The probe ™ iM pulses synchronously arising at the output of the generator 3 are supplied to the ultrasonic transducer 1, which transmits the acoustic pulse arising on it through the wall of the container 2 into the medium. At different density of the medium in the tank 2, the degree of damping of the wall by this medium in place

The installation of converter 1 will be different. Therefore, the amplitude of the pulse reflected from the inner wall will be different depending on the degree of damping, i.e. from the density (level of sediment) of the medium at the installation site of the converter 1. An analog-to-digital converter measures the amplitudes of all pulses, including the probe, which are fed to it

the input from the converter 1 through the amplitude limiter 5. The resulting code values of the amplitudes of the entire spectrum are fed to the input of the temporary selector 7, to the other input of this selector is fed into the calculated

time, strobe pulses from timer 4, which allow code values of pulse amplitudes reflected from the inner wall of the tank 4 to pass through the selector to the input of RAM 8 and CBM 9;

the amplitude value of the reflected pulse is recorded, which itself consists of many radio pulses of various amplitudes. The maximum 9 extraction circuit should analyze the envelope of the reflected radio pulse and give to the input the write permission of the RAM pulse, which will write the amplitude value of the pulse reflected from the inner wall into the RAM. The amplitude of this pulse will be proportional to the density (level) of the medium in the vessel 2. In this case, to determine the density, the converter 1 is mounted on the side wall of the vessel 2, to determine the level bottom of the vessel 2.

Formulas of the invention

A device for determining medium parameters in a container, comprising an ultrasonic transducer, a time selector, a shock excitation generator,

the output of which is connected to an ultrasonic transducer, a timer, the first output of which is connected to the input of the generator, and the second output is connected to the first input of the temporary selector, and an amplitude limiter,

the input of which is connected to an ultrasonic transducer, which requires that, in order to increase the measurement accuracy, an analog-to-digital transducer and a maximum isolation circuit are introduced into it

and random access memory, while the input of the analog-to-digital converter is connected to the output of the amplitude limiter, and the output is to the second input of the temporary selector, the output of which is connected to the first input of the random access memory and to the input of the maximum allocation circuit, the output of which is connected to the second input of the operational storage device.