RU114523U1 - DEVICE FOR MEASURING INFRASONIC OSCILLATIONS OF THE MEDIA - Google Patents

Abstract

 A device for measuring infrasonic vibrations of a medium containing an acoustic filter in the form of N sections (N≥1) connected to the housing, a sensing element connected to the environment and the environment inside the housing, a sensing element connected in series, a displacement sensor of the sensing element, a band amplifier and a demodulator connected to the analog output of the device, as well as a generator connected to the displacement sensor of the sensing element and the demodulator, characterized in that it further comprises a sequence a separately connected controlled generator, a controlled voltage divider and a first switch, a filter, an adder, a first amplifier and a first converter of an electrical signal into mechanical vibrations connected to a sensor element in series, and for each of the N sections, a (N + 1) switch connected in series, (N + 1) amplifier and (N + 1) converter of the electrical signal into mechanical vibrations installed at the input to the N section, with the filter input connected to the demodulator output, the key inputs connected to the control output emogo voltage divider, the second input of the adder connected to the output of the first switch, and the control inputs of the keys, with the voltage controlled oscillator and a divider connected to the control inputs of the device.

Description

The utility model relates to measuring technique, in particular, to the field of measuring infrasonic vibrations of a gaseous or liquid medium.

A device for measuring infrasonic vibrations of the medium, containing a housing and a sensing element associated with the environment and the environment inside the housing [1].

The closest technical solution to the proposed (prototype) is a device for measuring infrasonic vibrations of the medium, comprising a housing, a sensing element associated with the environment and the environment inside the housing, and a sensing element connected in series, a displacement sensor of the sensing element, a band amplifier and a demodulator connected to the analog output of the device, as well as a generator connected to the sensor of the displacement of the sensitive element and the demodulator [2].

The disadvantage of the prototype is that the device does not provide the required measurement accuracy due to insufficient dynamic range and lack of calibration, including when using acoustic filters.

The technical result provided by the claimed utility model is to increase the measurement accuracy.

The technical result is achieved in that a device for measuring infrasonic vibrations of the medium, comprising an acoustic filter in the form of N sections (N≥1), connected to the housing, a sensing element connected to the environment and the environment inside the housing, a sensing element connected in series, a sensitive displacement sensor element, a strip amplifier, and a demodulator connected to the analog output of the device, as well as a generator connected to the sensor of the displacement of the sensitive element and the demodulator, an additional but contains a serially connected controlled generator, a controlled voltage divider and a first switch, a series-connected filter, an adder, a first amplifier and a first converter of an electrical signal into mechanical vibrations associated with a sensitive element, and for each of N sections it is connected in series (N + 1) key, (N + 1) amplifier and (N + 1) converter of the electrical signal into mechanical vibrations installed at the input to the N section, the filter input being connected to the demodulator output, the key inputs are sub yucheny managed to output a voltage divider, the second input of the adder connected to the output of the first switch, and the control inputs of the keys, with the voltage controlled oscillator and a divider connected to the control inputs of the device.

Figure 1 presents the device that provides the required technical result.

Accepted designations:

1 - acoustic filter; 2 - section of the acoustic filter; 3 - case; 4 - sensitive element; 5 - sensor; 6 - strip amplifier; 7 - demodulator; 8 - analog output of the device; 9 - generator; 10 - controlled generator; 11 - controlled voltage divider; 12 - the first key; 13 - filter; 14 - adder; 15 - the first amplifier; 16 is a first converter of an electrical signal into mechanical vibrations; 17 - (N + 1) key; 18 - (N + 1) amplifier; 19 - (N + 1) converter of the electrical signal into mechanical vibrations; 20 - the first control input; 21 - second control input; 22 - third control input; 23 - fourth control input.

The device shown in figure 1, contains an acoustic filter 1 with sections of an acoustic filter 2; housing 3, a sensing element associated with the environment and the environment inside the housing 3, series-connected sensing element 4, a sensor 5 for displacement of the sensing element 4, a strip amplifier 6, and a demodulator 7 connected to the analog output 8 of the device, as well as a generator 9 connected to the sensor 5 for displacement of the sensing element 4 and the demodulator 7, a controlled generator 10, a controlled voltage divider 11 and a first switch 12 connected in series, a filter 13, an adder 14, a first coupler a line 15 and a first converter 16 of the electrical signal into mechanical vibrations associated with the sensing element 4, and for each of the N sections, a (17 + N) key 17, a (N + 1) amplifier 18, and a (N + 1) converter 19 an electrical signal into mechanical vibrations installed at the input to the N section, and the input of the filter 13 is connected to the output of the demodulator 7, the inputs of the keys 17 are connected to the output of the controlled voltage divider, the second input of the adder is connected to the output of the first key, and the control inputs of the controlled generator 10 controlled by voltage divider 11, and the keys connected to the control inputs.

Figure 1 presents the dotted line of the second key 17, the second amplifier 18 and the second transducer 19 for the second section of the acoustic filter in order to explain their connection. Similarly, these blocks are connected for the third, fourth and subsequent sections. The number of sections is usually limited by equipment capabilities and expediency.

The device shown in figure 1, operates as follows.

The acoustic filter 1 with sections 2 is connected to the housing 3. The sensing element 4 is fixed in the housing 3 between the environment and the housing containing the support medium, so that changes in environmental pressure lead to a displacement of the sensitive element 4, which can be used as a membrane, bellows or plate on the suspension. The displacement of the sensor element 4 relative to the neutral position leads to a change in the parameter (amplitude, frequency, phase, pulse duration) of the electric signal at the output of the sensor 5, to which the electric signal is supplied from the generator 9. From the output of the sensor 5, the signal is fed through a strip amplifier 6 to the demodulator 7 , which also receives the reference signal from the generator 9, so that at the output of the demodulator 7 connected to the analog output 8 of the device, an analog signal is formed, the amplitude of which depends on displacement of the sensing element 4. From the output of the demodulator 7, the analog signal is fed to a filter 13, forming the desired frequency response of the device and then, through the adder 14, is fed to the first amplifier 15, which provides the required signal amplitude for the first converter 16 of the electrical signal into mechanical vibrations. The first converter 16 of the electrical signal into mechanical vibrations is connected mechanically to the sensor 4 or acts on the sensor 4 through the medium, causing it to move. Thus, negative feedback is provided, which reduces the movement of the sensing element 4, increases the dynamic range of the device and extends the frequency range. This increases the measurement accuracy over a wider range of amplitudes of the input infrasound signals. In addition, to increase the accuracy of measurements, the device is calibrated with reference sinusoidal infrasound signals. To do this, from the output of the controlled generator 10 through the controlled voltage divider 11, and the first switch 12 to the second input of the adder 14 receives a sinusoidal signal, the amplitude of which changes from zero to maximum value by changing the voltage at the control input 21, and the frequency changes when the voltage at the control input 20. When voltage is applied to control input 22, the first key 12 closes and supplies a calibration signal from the controlled generator 10 through the adder 14 and the first amplifier 15 to the first converter 16 The electrical signals into mechanical vibrations, which forms the reference sinusoidal infrasonic signals.

When changing the amplitude and frequency of the controlled generator 10 by changing the voltage at the inputs 21, 20, according to the voltage at the output 8, the known characteristics of the links and the known voltage and frequency of the generator 10, the amplitude and amplitude-frequency characteristics of the device are calculated.

When the signal is removed from the control input 22 and applied to the control input 23, the second key 17 closes and supplies the calibration signal from the controlled generator 10 through the second amplifier 18 to the second converter 19 of the electrical signal into mechanical vibrations, which generates reference sinusoidal infrasound signals.

When changing the amplitude and frequency of the controlled generator 10 by changing the voltage at the inputs 21, 20, according to the voltage at the output 8, the known characteristics of the links and the known voltage and frequency of the generator 10, the amplitude and amplitude-frequency characteristics of the device as a whole, including the acoustic filter, are calculated (if all keys 17) or individual sections are included. This allows you to identify changes associated with clogging or damage to individual sections of the acoustic filter.

The first transducer 16 can also be installed on the other side of the sensing element 4, on the housing or on the partition between the compartments.

Information sources

1 K.V. Kislov, Yu.A. Kolesnikov, A.Yu. Marchenkov, Yu.O. Starovoit, Microbarometer, Copyright certificate SU 1769172A1, G01V 1/16, G01L 23/00, 1990.

2 Microbarometer MB 2000, Technical Description, Microbarometer MB 2000, Technical manual, Departement Analyse et Surveillance de L'Environnement (DASE), 1998

Claims (1)

A device for measuring infrasonic vibrations of a medium containing an acoustic filter in the form of N sections (N≥1) connected to the housing, a sensing element connected to the environment and the environment inside the housing, a sensing element connected in series, a displacement sensor of the sensing element, a band amplifier and a demodulator connected to the analog output of the device, as well as a generator connected to the sensor of the displacement of the sensing element and the demodulator, characterized in that it further comprises a sequence a separately connected controlled generator, a controlled voltage divider and a first switch, a filter, an adder, a first amplifier and a first converter of an electrical signal into mechanical vibrations connected to a sensor element in series, and for each of the N sections, a (N + 1) switch connected in series, (N + 1) amplifier and (N + 1) converter of the electrical signal into mechanical vibrations installed at the input to the N section, with the filter input connected to the demodulator output, the key inputs connected to the control output emogo voltage divider, the second input of the adder connected to the output of the first switch, and the control inputs of the keys, with the voltage controlled oscillator and a divider connected to the control inputs of the device.