CN213339072U - Wind noise suppression type debris flow infrasound detection and positioning device - Google Patents
Wind noise suppression type debris flow infrasound detection and positioning device Download PDFInfo
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- CN213339072U CN213339072U CN202022325260.XU CN202022325260U CN213339072U CN 213339072 U CN213339072 U CN 213339072U CN 202022325260 U CN202022325260 U CN 202022325260U CN 213339072 U CN213339072 U CN 213339072U
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Abstract
The application discloses a wind noise suppression type debris flow infrasound detection and positioning device, which relates to the field of monitoring and early warning amount of debris flow disasters and aims to reduce wind noise; the output end of the infrasound detection device is connected to the input end of the interface circuit, the output end of the interface circuit is connected to the input end of the low-pass filter, the output end of the low-pass filter is connected to the input end of the amplifier, the output end of the amplifier is connected to one input end of the signal modulator, the output end of the signal modulator is connected to the input end of the radio transmission circuit, the output end of the radio transmission circuit is connected to the transmission antenna, and the output end of the carrier frequency generator is connected to the other input end of the signal modulator, so that wind noise filtering is achieved.
Description
Technical Field
The utility model relates to a mud-rock flow calamity's monitoring early warning volume field, concretely relates to wind noise suppression type mud-rock flow infrasound detects and positioner.
Background
A mud-rock flow is a thick fluid saturated with silt and rocks. This fluid, which also contains a large amount of sand and lumps, flows in the valley bed at a velocity of a few to a few tens of meters per second. The frequency, the main frequency amplitude, the duration and the like of infrasound signals emitted by the underwater acoustic transducer have unique characteristics, can be transmitted at a speed of 344m/s for a long distance in the air at normal temperature, and can be transmitted without obstruction through a tiny gap. Infrasound has the characteristics of small attenuation and wide propagation range, so that infrasound becomes one of very effective checking technologies. According to the characteristics of the debris flow, the invention improves and utilizes the infrasound detection method to develop a new generation of debris flow alarm system with a brand new concept, can avoid a plurality of defects of other existing alarm methods, and enables debris flow early warning to be more practical and reliable, and the early warning lead can reach dozens of minutes.
At present, the existing technology for monitoring the debris flow by using the infrasound waves in China ignores the influence of wind noise on detection in the infrasound propagation process. The literature indicates that when the wind speed is changed in the range of 6.7-11.2m/s, the pressure is changed in the range of about 50Pa random pressure fluctuation, and the infrasound signal is in the order of mPa, so the wind pressure is a strong noise interfering with the observation of the infrasound. Without effective suppression, the effectiveness of the infrasound detection is greatly affected.
In order to reduce the influence of wind noise on infrasound monitoring, a noise reduction technology is required to be applied to improve the infrasound monitoring capability; therefore, wind noise reduction is an important component of infrasound research work. However, infrasound noise reduction systems have not progressed until the last 20 years. The wind noise filter based on the micro-seepage pipe is invented by adopting an advanced technical principle based on a large number of tests, so that the influence of infrasound wind noise is greatly reduced, and infrasound detection on debris flow is more timely and accurate. The wind noise suppression type debris flow infrasound detection and positioning system is researched and developed based on the technical background, breaks through the technical limitation of the current debris flow detection field, and becomes a new technology in the technical field of disaster reduction and prevention.
SUMMERY OF THE UTILITY MODEL
The application discloses wind noise suppression type mud-rock flow infrasound detects and positioner reduces wind noise and makes the infrasound detection to mud-rock flow more accurate.
In order to achieve the purpose, the technical scheme adopted by the application is as follows:
a wind noise suppression type debris flow infrasound detection and positioning device comprises an infrasound detection device, an interface circuit, a low-pass filter, an amplifier, a signal modulator, a radio transmission circuit, a transmission antenna, a power supply and a carrier frequency generator; the output end of the infrasound detection device is connected to the input end of the interface circuit, the output end of the interface circuit is connected to the input end of the low-pass filter, the output end of the low-pass filter is connected to the input end of the amplifier, the output end of the amplifier is connected to one input end of the signal modulator, the output end of the signal modulator is connected to the input end of the radio transmission circuit, and the output end of the radio transmission circuit is connected to the transmission antenna; the power supply is connected with the infrasound detection device, the interface circuit, the low-pass filter, the amplifier and the carrier frequency generator; the output of the carrier frequency generator is connected to the other input of the signal modulator.
Preferably, the infrasound detection device consists of four micro-seepage hoses, four connecting devices, an infrasound sensor and a cross-shaped steel pipe, wherein the four micro-seepage hoses are connected end to end through the connecting devices to form a ring, the infrasound sensor is arranged in the center of the cross-shaped steel pipe, and four ends of the cross-shaped steel pipe are fixed to the connecting devices.
Preferably, the micro-infiltration hose is uniformly provided with small holes.
Preferably, the infrasound sensor employs a capacitive infrasound sensor.
Preferably, the low-pass filter adopts a low-pass filter with a cut-off frequency of 20 HZ.
The wind noise reduction and the infrasonic wave monitoring are realized by arranging an infrasonic detecting device, an interface circuit, a low-pass filter, an amplifier, a signal modulator, a radio transmitting circuit, a transmitting antenna, a power supply and a carrier frequency generator; the micro-seepage hose is provided with small holes, so that part of wind noise can be filtered, the accuracy of debris flow infrasound detection is greatly improved, and the low-pass filtering processing of the circuit is combined, so that the debris flow infrasound detection is quasi-reliable; by means of radio transmission, accurate synchronization is achieved, the time difference of infrasound reaching different detection points can be accurately measured, and calculation accuracy is guaranteed.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of an infrasound detection apparatus;
FIG. 3 is a schematic cross-sectional view of an infrasound detection apparatus A-A;
wherein, 1-micro-seepage hose, 2-cross steel pipe, 3 connecting devices and 4-infrasound sensor.
Detailed Description
The application discloses a wind noise suppression type debris flow infrasound detection and positioning device, which comprises an infrasound detection device, an interface circuit, a low-pass filter, an amplifier, a signal modulator, a radio transmission circuit, a transmission antenna, a power supply and a carrier frequency generator, wherein the infrasound detection device is connected with the interface circuit; the output end of the infrasound detection device is connected to the input end of the interface circuit, the output end of the interface circuit is connected to the input end of the low-pass filter, the output end of the low-pass filter is connected to the input end of the amplifier, the output end of the amplifier is connected to one input end of the signal modulator, the output end of the signal modulator is connected to the input end of the radio transmission circuit, and the output end of the radio transmission circuit is connected to the transmission antenna; the power supply is connected with the infrasound detection device, the interface circuit, the low-pass filter, the amplifier and the carrier frequency generator; the output of the carrier frequency generator is connected to the other input of the signal modulator.
The infrasound detection device is responsible for infrasound monitoring and can achieve wind noise filtering on hardware. The infrasound detection device is structurally shown in figure 2, a cross-sectional schematic view of the A-A surface of the infrasound detection device is shown in figure 3, the infrasound detection device is annular and comprises four micro-seepage hoses 1, four connecting devices 3, an infrasound sensor 4 and a cross-shaped steel pipe 2, the four micro-seepage hoses 1 are connected end to end through the connecting devices to form an annular shape, the infrasound sensor 4 is installed in the center of the cross-shaped steel pipe 2, and four ends of the cross-shaped steel pipe 2 are fixed to the connecting devices 3. Based on the micro-seepage pipe noise filtering principle, micro-pores are uniformly distributed on the micro-seepage hose 1 and used for filtering wind noise, and various sound information can be transmitted to the filter from different directions due to the annular design. Sound information passes through the micropores, 70-80% of wind noise can be filtered, and meanwhile, low-frequency signals below 20Hz can reach the infrasound sensor 4. Micropores are uniformly distributed on the micro-seepage hose 1 which is connected into a ring and connected with the cross-shaped steel pipe 2, so that sound information is transmitted to the infrasound sensor 4 arranged at the center of the circle. The infrasound detection means may be connected to the interface circuit by wiring through the infrasound sensor 4.
Furthermore, the infrasound sensor 4 adopts a capacitive infrasound sensor with small volume and high sensitivity; the micro-seepage hose 1 is made of soft materials, so that extra noise is not increased; the micro-seepage hose 1 and the cross-shaped steel pipe 2 are fixed through the connecting device 3, and the frequency characteristic of the whole filtering device can be controlled by adjusting the micro-seepage hose 1; when the equipment is installed, the supporting device must ensure that the micro-infiltration hose 1 does not deform.
The working principle of the utility model is as follows:
the infrasound detection device detects infrasound signals, the infrasound detection device primarily filters most of wind noise, the detected signals are input to the low-pass filter through the interface circuit to be filtered and filtered to filter residual noise, then the signals are amplified by the amplifier and then transmitted to the signal modulator, the carrier frequency generator and the signal modulator perform frequency modulation on the signals, and the signals after the frequency modulation are more beneficial to wireless transmission and have stronger anti-interference capability. The finally processed signal is transmitted to the transmitting antenna via the radio transmitting circuit. The power supply supplies power to the infrasound detection device, the interface circuit, the low-pass filter, the amplifier and the carrier frequency generator.
Claims (5)
1. The utility model provides a wind noise suppression type mud-rock flow infrasound detects and positioner which characterized in that: the device comprises an infrasound detection device, an interface circuit, a low-pass filter, an amplifier, a signal modulator, a radio transmission circuit, a transmission antenna, a power supply and a carrier frequency generator;
the output end of the infrasound detection device is connected to the input end of the interface circuit, the output end of the interface circuit is connected to the input end of the low-pass filter, the output end of the low-pass filter is connected to the input end of the amplifier, the output end of the amplifier is connected to one input end of the signal modulator, the output end of the signal modulator is connected to the input end of the radio transmission circuit, and the output end of the radio transmission circuit is connected to the transmission antenna;
the power supply is connected with the infrasound detection device, the interface circuit, the low-pass filter, the amplifier and the carrier frequency generator; the output of the carrier frequency generator is connected to the other input of the signal modulator.
2. The wind noise suppression type mud-rock flow infrasound detecting and locating device of claim 1, wherein: the infrasound detection device comprises four micro-seepage hoses, four connecting devices, an infrasound sensor and a cross-shaped steel pipe, wherein the four micro-seepage hoses are connected end to end through the connecting devices to form a ring, the infrasound sensor is arranged in the center of the cross-shaped steel pipe, and four ends of the cross-shaped steel pipe are fixed to the connecting devices.
3. A wind noise suppression type mud-rock flow infrasound detecting and locating device according to claim 2, characterized in that: the micro-seepage hose is uniformly provided with small holes.
4. A wind noise suppression type mud-rock flow infrasound detecting and locating device according to claim 2, characterized in that: the infrasound sensor adopts a capacitance type infrasound sensor.
5. The wind noise suppression type mud-rock flow infrasound detecting and locating device of claim 1, wherein: the low-pass filter adopts a low-pass filter with the cut-off frequency of 20 HZ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022325260.XU CN213339072U (en) | 2020-10-19 | 2020-10-19 | Wind noise suppression type debris flow infrasound detection and positioning device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022325260.XU CN213339072U (en) | 2020-10-19 | 2020-10-19 | Wind noise suppression type debris flow infrasound detection and positioning device |
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| CN213339072U true CN213339072U (en) | 2021-06-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113311479A (en) * | 2021-06-28 | 2021-08-27 | 江西省安特机械有限公司 | Earthquake prediction alarm system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113311479A (en) * | 2021-06-28 | 2021-08-27 | 江西省安特机械有限公司 | Earthquake prediction alarm system |
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