Wide-range infrasound measuring instrument

Abstract

The invention discloses a wide-range infrasound measuring instrument, which comprises a local wide-range infrasound sensor, a data acquisition, analysis and transmission device, an upper cover and a touch display screen, the wide-range infrasonic sensor can detect infrasonic waves with the range of 10 kPa, and is used as a standard sensor for calibrating an external infrasonic sensor; the local wide-range infrasound sensor is mounted in the upper cover, and an output signal line is connected to a circuit board of the data acquisition, analysis and transmission device; the data acquisition, analysis and transmission device is provided with an external three-differential sensor port, an external double-differential sensor port and an external single-end polarized infrasound sensor port; and the data acquisition analysis and transmission device acquires sensor signals of the local wide-range infrasound sensor, the external three-differential sensor port, the external double-differential sensor port and the external single-end polarization infrasound sensor port, analyzes the sensor signals and displays an analysis result on the touch display screen in real time. According to the invention, integrated and high-performance infrasound measurement with a measuring range of 10kPa can be realized.

Description

Technical Field

[0001] The invention belongs to the technical field of infrasound measurement, and in particular relates to a wide-range infrasound measuring instrument. Background Art

[0002] Existing infrasound measurements all have sensors and acquisition equipment separated. However, due to environmental electromagnetic interference, variable frequency bands and sensitivity levels of sensors, or high noise levels, the measurement results have large errors. General infrasound sensors either have insufficient lower frequency limits, insufficient ranges, large linear distortion, or large background noise. There are even electric, electromagnetic, and piezoelectric infrasound sensors that are much worse than capacitive performance, resulting in inconsistent measurement results. A high-performance standardized infrasound measuring instrument is needed in many fields. Summary of the invention

[0003] The object of the present invention is to provide a high-performance, wide-range infrasound measuring instrument with a measuring range of 10 kPa and an integrated structure.

[0004] In order to achieve the above-mentioned object, one aspect of the present invention provides a wide-range infrasound measuring instrument, including a local wide-range infrasound sensor, a data acquisition and analysis and transmission device, an upper cover and a touch display screen;

[0005] The wide-range infrasound sensor of the machine is a capacitive sensor, which can detect infrasound waves with a range of 10 kPa, has a symmetrical output capability for positive and negative sound pressures, and is used as a standard sensor to calibrate an external infrasound sensor; the wide-range infrasound sensor of the machine is installed in the upper cover and the output signal line is connected to the circuit board of the data acquisition, analysis and transmitter, the upper cover is sealed and fixed with the data acquisition, analysis and transmitter and the touch display screen, and the touch display screen displays the signal of the data acquisition, analysis and transmitter and is used to input instructions;

[0006] The data acquisition, analysis and transmission device has an external three-differential sensor port, an external double-differential sensor port and an external single-ended polarized infrasound sensor port. The external three-differential sensor port is used to simultaneously acquire three differential signals of the external infrasound sensor and provide a working power supply voltage to the sensor. The external double-differential sensor port is used to simultaneously acquire two differential signals of the external infrasound sensor and provide a working power supply voltage to the sensor. The external single-ended polarized infrasound sensor port is used to acquire one single-ended signal of the external infrasound sensor and provide a working power supply voltage and a polarization voltage to the sensor.

[0007] The data acquisition, analysis and transmission device collects sensor signals from the local wide-range infrasound sensor and the external three-differential sensor port, the external double-differential sensor port, and the external single-ended polarization infrasound sensor port, analyzes the sensor signals, displays the analysis results on the touch display screen in real time, and responds to instructions from the touch display screen.

[0008] Preferably, the wide-range infrasound measuring instrument further comprises a battery box, and the data acquisition, analysis and transmission device are sealed and fixed with the upper cover and are installed together on the battery box.

[0009] Preferably, the wide-range infrasound measuring instrument further comprises an antenna group, which is an integrated device including a Beidou / GPS antenna, a WIFI antenna, a 4G / 5G antenna, and an LR-WIFI antenna, and the antenna group is tightly fixed to the data acquisition analysis and transmitter.

[0010] Preferably, the wide-range infrasound measuring instrument further comprises a power switch and a battery switch, wherein the power switch is fixedly mounted on the data acquisition, analysis and transmission device and controls the connection and disconnection of the power supply, and the battery switch is fixedly mounted on the battery box and controls the connection and disconnection of the battery.

[0011] Preferably, the wide-range infrasound measuring instrument also includes a Beidou / GPS signal indicator light, a network transmission indicator light and a network port. The Beidou / GPS signal indicator light is fixedly mounted on the data acquisition, analysis and transmitter and indicates the reception effect of the Beidou and GPS signals. The network transmission indicator light is fixedly mounted on the data acquisition, analysis and transmitter and indicates the effect of data uploading. The network port is fixedly mounted on the data acquisition, analysis and transmitter and serves as an interface for communicating with the host computer.

[0012] Preferably, the local wide-range infrasound sensor is horizontally installed in the upper cover and the signal line is connected to the circuit board of the data acquisition, analysis and transmission device, and the signal line is plugged in horizontally.

[0013] Preferably, the wide-range infrasound sensor of the machine is vertically installed in the upper cover and the signal line is connected to the circuit board of the data acquisition analysis and transmitter. The signal line is vertically plugged in, and the antenna group is connected to the data acquisition analysis and transmitter through a soft wire.

[0014] The wide-range infrasound measuring instrument according to the above aspects of the present invention can realize high-performance infrasound measurement with a range of up to 10 kPa and integrated integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work:

[0016] Figure 1 is a schematic structural diagram of a wide-range infrasound measuring instrument according to an embodiment of the present invention;

[0017] Figure 2 It is a schematic diagram of a wide-range infrasound sensor and internal signal lines of an embodiment of the present invention;

[0018] Figure 3 It is a circuit board principle block diagram of an 8-channel data acquisition, analysis and transmission device of a wide-range infrasound measuring instrument according to an embodiment of the present invention;

[0019] Figure 4 It is a functional block diagram of a data acquisition, analysis and transmission device of a wide-range infrasound measuring instrument according to an embodiment of the present invention;

[0020] Figure 5 This is a comparison diagram of the variation of the output voltage of a wide-range infrasound sensor according to an embodiment of the present invention and a common infrasound sensor with respect to sound pressure;

[0021] Figure 6 This is a comparison diagram of output signal waveforms of a wide-range infrasound sensor and a common infrasound sensor according to an embodiment of the present invention;

[0022] Figure 7 is a distortion comparison diagram of a wide-range infrasound sensor according to an embodiment of the present invention and a common infrasound sensor;

[0023] Figure 8 This is a schematic diagram of an in-situ calibration installation of an infrasound sensor using a wide-range infrasound measuring instrument according to an embodiment of the present invention;

[0024] Fig. 9 This is a schematic diagram of the installation of a wide-range infrasound measuring instrument according to an embodiment of the present invention for on-site verification of differential sensors such as MB3a;

[0025] Fig.10 It is a schematic diagram of calibrating a polarization-required single-ended infrasound sensor such as B&K4193 using a wide-range infrasound measuring instrument according to an embodiment of the present invention;

[0026] Fig.11 is a front structural schematic diagram of a wide-range infrasound measuring instrument according to another embodiment of the present invention;

[0027] Fig.12 It is a side structural schematic diagram of a wide-range infrasound measuring instrument according to another embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 1- local wide-range infrasound sensor, 2- data acquisition analysis and transmitter, 3- upper cover, 4- touch screen, 5- battery box, 6- antenna group, 7- external three-differential sensor port, 8- external double-differential sensor port, 9- external single-ended polarization infrasound sensor port, 10- power switch, 11- battery switch, 12- Beidou / GPS signal indicator light, 13- network transmission indicator light, 14- network port. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] One embodiment of the present invention provides a wide range infrasound measuring instrument, such as Figure 1 As shown, the wide-range infrasound measuring instrument of the embodiment of the present invention includes: a local wide-range infrasound sensor 1, a data acquisition analysis and transmitter 2, an upper cover 3, a touch display screen 4, a battery box 5, an antenna group 6, a power switch 10, a battery switch 11, a Beidou / GPS signal indicator light 12, a network transmission indicator light 13, and a network port 14.

[0032] The wide-range infrasound sensor 1 of this machine has a 10kPa wide-range infrasound wave detection capability and is used as a standard sensor to calibrate an external infrasound sensor. The wide-range infrasound sensor 1 of this machine is installed in the upper cover 3 and the signal line is connected to the circuit board of the data acquisition analysis and transmitter 2. The data acquisition analysis and transmitter 2 is sealed and fixed with the upper cover 3 and installed together on the battery box 5. The upper cover 3 is sealed and fixed with the data acquisition analysis and transmitter 2 and the touch display screen 4. The touch display screen 4 displays the signal parameters and curves of the data acquisition analysis and transmitter 2 and serves as an operation input and command input. The battery box 5 is an integral body and is installed under the data acquisition analysis and transmitter 2.

[0033] The antenna group 6 is an integrated device including multiple antennas such as Beidou / GPS antenna, WIFI antenna, 4G / 5G antenna, LR-WIFI, etc. The antenna group 6 is tightly fixed to the data acquisition analysis and transmitter 2. The data acquisition analysis and transmitter 2 has three external sensor interfaces: an external three-differential sensor port 7, an external double differential sensor port 8, and an external single-ended polarized infrasound sensor port 9. Among them, the external three-differential sensor port 7 is an interface that can simultaneously collect three differential signals of a sensor and provide working power to the sensor, the external double differential sensor port 8 is an interface that can simultaneously collect two differential signals of a sensor and provide working power to the sensor, and the external single-ended polarized infrasound sensor port 9 is an interface that can collect one single-ended signal of a sensor and provide working power and polarization voltage to the sensor.

[0034] The power switch 10 is fixedly mounted on the data acquisition, analysis and transmitter 2 and controls the connection and disconnection of the power supply. The battery switch 11 is fixedly mounted on the battery box 5 and controls the connection and disconnection of the battery. The Beidou / GPS signal indicator light 12 is fixedly mounted on the data acquisition, analysis and transmitter 2 and indicates the reception effect of the Beidou and GPS signals. The network transmission indicator light 13 is fixedly mounted on the data acquisition, analysis and transmitter 2 and indicates the effect of data uploading. The network port 14 is fixedly mounted on the data acquisition, analysis and transmitter 2 and serves as an interface for communication with the host computer.

[0035] The wide-range infrasound sensor 1 of this machine is used to detect infrasound waves of 10kPa, and can be used as a standard sensor for calibration of external infrasound sensors. The data acquisition analysis and transmission device 2 has a quantization of 24bits and a dynamic range of more than 132dB, so that accurate detection can be achieved. The data acquisition analysis and transmission device 2 has three external sensor interfaces to achieve calibration of three different sensors. The battery box 5 provides a working power supply, which can realize field work and can also work indoors with an external 220V AC power supply. The battery box 5 is a relatively independent component. After removing the battery box 5, other DC power supplies can be used to directly power the wide-range infrasound measuring instrument.

[0036] The wide-range infrasound sensor 1 of this machine is installed in the upper cover 3, and has symmetrical output capability for positive and negative pressures, and its linear range is improved by about 10 times compared with the ordinary capacitive infrasound sensor, and its output signal line is connected to the data acquisition analysis and transmitter 2. The wide-range infrasound sensor 1 of this machine has a range of 10kPa, a -3dB frequency band of 0.01Hz-200Hz, and a dynamic range of 120dB. It is used as a standard infrasound sensor to calibrate other sensors connected to the data acquisition analysis and transmitter 2.

[0037] The data acquisition analysis and transmission device 2 collects the signals of the local wide-range infrasound sensor 1 and the external three-differential sensor port 7, the external double-differential sensor port 8, and the external single-ended polarized infrasound sensor port 9, analyzes the sensor signals and provides them to the touch screen 4 for display, and uploads the collected data to the host computer through the antenna group 6 or the network port 14.

[0038] The randomly installed wide-range infrasound sensor 1 is fixedly installed in the inner hole of the upper cover 3, and the signal line is connected to the data acquisition analysis and transmission device 2. Figure 2 The wide-range infrasound sensor 1 is a capacitive sensor with symmetrical output capability for positive and negative pressures. The linear range is improved by about 10 times compared with ordinary capacitive infrasound sensors. The RMS value of the range reaches 10kPa, the -3dB frequency band is 0.01Hz-200Hz, the dynamic range is 120dB, the performance is stable, and it can be used as a standard sensor to test other external sensors.

[0039] Figure 5 The figure shows the relationship between the output voltage of the infrasound sensor and the sound pressure. It can be seen that the output voltage value of the ordinary capacitive infrasound sensor increases when the positive sound pressure increases and approaches the limit when the negative pressure increases. The positive pressure output and negative pressure output amplitudes of the wide-range capacitive infrasound sensor of the present invention are symmetrical, so the distortion is small. Figure 6 The figure shows the change of the infrasound sensor output voltage with the 1kHz sine wave sound pressure. It can be seen that the negative sound pressure output voltage of the common capacitive infrasound sensor becomes flat, while the output voltage waveform of the wide-range capacitive infrasound sensor of the present invention is symmetrical. Figure 7 The distortion changes with the sound pressure level. When the sound pressure is 1000Pa, the distortion of the ordinary capacitive infrasound sensor is 3%, while the distortion of the wide-range capacitive infrasound sensor of the present invention is 0.5%. When the sound pressure is 10kPa, the distortion of the ordinary capacitive infrasound sensor is 8%, while the distortion of the wide-range capacitive infrasound sensor of the present invention is 3%.

[0040] The data acquisition analysis and transmission device 2 can not only collect signals from 4 sensors (including the local wide-range infrasound sensor 1 and 3 external infrasound sensors) through channel switching, but also can collect signals from 8 channels in total. Figure 3 and Figure 4 , and can analyze sensor signals (waveform, spectrum, time-frequency, consistency error, etc.), and display the analysis results in real time on the touch screen 4, and respond to the instructions of the touch screen 4. The battery box 5 supplies power to each sensor interface through the power conversion module.

[0041] like Figure 3 As shown, the antenna group 6 is fixedly connected to the data acquisition analysis and transmitter 2 through the antenna base, including Beidou / GPS antenna, WIFI antenna, 4G / 5G antenna, LR-WIFI transmission and LR-WIFI reception, a total of 5 rod antennas, the gain of which varies from 3dB to 16dB when the antenna length is different, and is used to transmit data and instructions to the host computer. The data acquisition analysis and transmitter 2 performs system control, data storage, network transmission management and high-precision acquisition of multi-channel differential signals, including ARMA9, FPGA, ∑-Δ analog-to-digital converter ADC and other chips.

[0042] The external sensor of the external three-differential sensor port 7 can be connected through the 10-core LEM0 socket A with three differential signals S0, S1, and S2, and the working power supply voltage is provided to the sensor. The wide-range infrasound sensor 1 of this machine is connected to the differential signals S3 and S4 through the 8-core row socket D. Figure 8In the in-situ calibration of the infrasound sensor shown, the wide-range infrasound measuring instrument of the present invention is connected to the infrasound sensor to be calibrated, and the wide-range infrasound measuring instrument and the infrasound sensor to be calibrated are installed in the same spatial position, close together with a spacing of less than 1m, and the infrasound waves in the same spatial position are detected. For sounds with a frequency below 50 Hz within 6 wavelengths, the wide-range infrasound measuring instrument is used as a reference, and the signal of the infrasound sensor to be calibrated is connected by the sensor interface A of the wide-range infrasound measuring instrument. The data acquisition analysis and transmitter 2 collects the signal of the interface A, and the amplitude deviation and phase deviation of the signal of the wide-range infrasound sensor 1 of the local wide-range infrasound sensor and the signal of the infrasound sensor to be calibrated are calculated by software. When the signal is collected for a long enough time, it can be determined that the sounds received by the two sensors are basically the same, or when the environmental infrasound waves are relatively stable, the interference of other noises can be eliminated to achieve calibration.

[0043] The external sensor of the external dual differential sensor port 8 can be connected through the 7-pin LEMO socket B with two differential signals S5 and S6, and the working power supply voltage is provided to the sensor at the same time. Fig. 9 When the dual differential sensor such as MB3a is calibrated on site, the wide-range infrasound sensor 1 of the local unit is taken out and connected to the same sound port on the infrasound standard source as the calibrated infrasound sensor. The wide-range infrasound sensor 1 of the local unit is connected to the interface A of the data acquisition, analysis and transmission device 2, and the calibrated infrasound sensor is connected to the interface B of the data acquisition, analysis and transmission device 2.

[0044] The external sensor of the external single-ended polarized infrasound sensor port 9 is connected through a 7-core LEM0 socket C with only one single-ended signal S7, which provides the sensor with a working power supply voltage and a polarization voltage. Fig.10 When calibrating the B&K4193 and other infrasound sensors that need polarization, the wide-range infrasound sensor 1 of the local machine is taken out from the wide-range infrasound measuring instrument and connected to the infrasound calibration source. The local wide-range infrasound sensor 1 is connected to the interface A of the data acquisition analysis and transmitter 2 by a double-headed 7-core LEMO plug line. The B&K4193 and other single-ended infrasound sensors that need polarization are connected to the interface C of the data acquisition analysis and transmitter 2 through another double-headed 7-core LEMO plug line. The socket C provides 200V polarization voltage to the sensor to be calibrated, and also provides the working power supply voltage of the sensor, so that the local sensor can be used to calibrate the B&K4193 and other infrasound sensors that need polarization. The calibrated B&K4193 and other infrasound sensors that need polarization are connected to the same sound port of the infrasound standard source through the tooling.

[0045] Another embodiment of the present invention provides a wide range infrasound measuring instrument, such as Fig.11 and Fig.12The device shown includes a wide-range infrasound sensor 1, a data acquisition, analysis and transmitter 2, an upper cover 3, a touch screen 4, an antenna group 6, a power switch 10, a Beidou / GPS signal indicator light 12, a network transmission indicator light 13, and a network port 14. The data acquisition, analysis and transmitter 2 has an external three-differential sensor port 7, an external double-differential sensor port 8, and an external single-ended polarization infrasound sensor port 9.

[0046] Compared with the wide-range infrasound measuring instrument of the previous embodiment of the present invention, this embodiment has the following differences: the previous embodiment is a throne-style installation, the wide-range infrasound sensor 1 of this machine is horizontally installed in the upper cover 3 and the signal line is connected to the circuit board of the data acquisition analysis and transmitter 2, and the signal line is plugged horizontally; this embodiment is a mountain beam installation, the wide-range infrasound sensor 1 of this machine is vertically installed in the upper cover 3 and the signal line is connected to the circuit board of the data acquisition analysis and transmitter 2, and the signal line is plugged vertically. In addition, in this embodiment, Fig.12 As shown, the antenna group 6 is connected to the data acquisition, analysis and transmission device 2 through a flexible wire. Other structures are the same as those in the previous embodiment and will not be described in detail.

[0047] The wide-range infrasound measuring instrument of the above embodiment of the present invention can realize an integrated wide-range infrasound measuring instrument with a measuring range of 10kPa, a -3dB frequency range of 0.01Hz-200Hz, a full-scale distortion of less than 3%, a dynamic range of 120dB, and strong analysis function.

[0048] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A wide-range infrasound measuring instrument, characterized in that: It includes the local wide-range infrasound sensor, data acquisition analysis and transmitter, top cover and touch display screen; The wide-range infrasound sensor of the machine is a capacitive sensor, which can detect infrasound waves with a range of 10 kPa, has a symmetrical output capability for positive and negative sound pressures, and is used as a standard sensor to calibrate an external infrasound sensor; the wide-range infrasound sensor of the machine is installed in the upper cover and the output signal line is connected to the circuit board of the data acquisition, analysis and transmitter, the upper cover is sealed and fixed with the data acquisition, analysis and transmitter and the touch display screen, and the touch display screen displays the signal of the data acquisition, analysis and transmitter and is used to input instructions; The data acquisition, analysis and transmission device has an external three-differential sensor port, an external double-differential sensor port and an external single-ended polarized infrasound sensor port. The external three-differential sensor port is used to simultaneously acquire three differential signals of the external infrasound sensor and provide a working power supply voltage to the sensor. The external double-differential sensor port is used to simultaneously acquire two differential signals of the external infrasound sensor and provide a working power supply voltage to the sensor. The external single-ended polarized infrasound sensor port is used to acquire one single-ended signal of the external infrasound sensor and provide a working power supply voltage and a polarization voltage to the sensor. The data acquisition, analysis and transmission device collects sensor signals from the local wide-range infrasound sensor and the external three-differential sensor port, the external double-differential sensor port, and the external single-ended polarization infrasound sensor port, analyzes the sensor signals, displays the analysis results on the touch display screen in real time, and responds to instructions from the touch display screen.

2. The wide-range infrasound measuring instrument according to claim 1, characterized in that: It also includes a battery box, and the data acquisition analysis and transmission device are sealed and fixed with the upper cover and installed together on the battery box.

3. The wide-range infrasound measuring instrument according to claim 1 or 2, characterized in that: It also includes an antenna group, which is an integrated device including a Beidou / GPS antenna, a WIFI antenna, a 4G / 5G antenna, and an LR-WIFI antenna. The antenna group is tightly fixed with the data acquisition analysis and transmitter.

4. The wide-range infrasound measuring instrument according to claim 1 or 2, characterized in that: It also includes a power switch and a battery switch. The power switch is fixed on the data acquisition analysis and transmission device and controls the connection and disconnection of the power supply. The battery switch is fixed on the battery box and controls the connection and disconnection of the battery.

5. The wide-range infrasound measuring instrument according to claim 1 or 2, characterized in that: It also includes a Beidou / GPS signal indicator light, a network transmission indicator light and a network port. The Beidou / GPS signal indicator light is fixedly installed on the data acquisition, analysis and transmitter and indicates the reception effect of Beidou and GPS signals. The network transmission indicator light is fixedly installed on the data acquisition, analysis and transmitter and indicates the effect of data uploading. The network port is fixedly installed on the data acquisition, analysis and transmitter and serves as an interface for communication with the host computer.

6. The wide-range infrasound measuring instrument according to claim 1 or 2, characterized in that: The wide-range infrasound sensor of the machine is horizontally installed in the upper cover and the signal line is connected to the circuit board of the data acquisition analysis and transmission device, and the signal line is plugged in horizontally.

7. The wide-range infrasound measuring instrument according to claim 1 or 2, characterized in that: The wide-range infrasound sensor of this machine is installed vertically in the upper cover and the signal line is connected to the circuit board of the data acquisition analysis and transmitter. The signal line is plugged vertically, and the antenna group is connected to the data acquisition analysis and transmitter through a soft line.

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