Urban geological safety pulse early warning system probe

Abstract

The utility model relates to an urban geological safety tremor early warning system probe, which comprises a probe shell, a sensor assembly and a signal processing circuit, the sensor assembly and the signal processing circuit are arranged in the probe shell, the sensor assembly comprises a broadband MEMS sensor, and the signal processing circuit is integrated with a sigma-delta A / D digital quantity filter and a sigma-delta A / D modulator. The broadband MEMS sensor is electrically connected with the sigma-delta A / D modulator through an MEMS sensor electric connection pin, the sigma-delta A / D digital quantity filter is electrically connected with the sigma-delta A / D modulator, and the sigma-delta A / D digital quantity filter is electrically connected with the probe cable. The system has the capabilities of high-sensitivity vibration detection, environmental noise suppression, automatic inclination correction and remote monitoring, significantly reduces the false alarm rate of geological disasters, and is suitable for long-term deployment in cities and remote areas.

Description

TECHNICAL FIELD

[0001] The utility model relates to geological disaster monitoring equipment technical field especially is related to city geological safety ground pulsation early warning system probe. BACKGROUND

[0002] Geological disaster monitoring probe is an intelligent monitoring equipment integrating multi-band MEMS sensor array, digital filter technology and wireless communication module, which can collect key parameters such as surface displacement, vibration frequency and inclination angle in real time.

[0003] In the prior art, the traditional geological disaster monitoring probe adopts a single acceleration sensor, which has the following defects: limited sensitivity (usually >100mV / g), low sensitivity, susceptible to environmental noise interference, and difficult to capture weak geological activities; natural vibration and artificial interference are not distinguished, the existing probe is difficult to distinguish natural pulsation signal and artificial vibration (such as traffic and construction), and the false alarm rate is as high as more than 30%; wired transmission mode restricts the deployment range, data transmission relies on wired connection or high-power wireless module, and it is difficult to deploy in remote areas for a long time; analog signal transmission is susceptible to electromagnetic interference, and the signal-to-noise ratio is <40dB. SUMMARY

[0004] In view of the deficiencies in the prior art, the utility model aims to provide a city geological safety ground pulsation early warning system probe, which has high sensitivity vibration detection, environmental noise suppression, inclination automatic correction and remote monitoring capability, significantly reduces the false alarm rate of geological disasters, and is suitable for long-term deployment in cities and remote areas.

[0005] The above utility model of the utility model is realized by the following technical schemes:

[0006] The city geological safety ground pulsation early warning system probe comprises a probe shell, a sensor assembly and a signal processing circuit installed in the probe shell, the sensor assembly comprises a wideband MEMS sensor, the signal processing circuit integrates a sigma-delta A / D digital filter and a sigma-delta A / D modulator, the wideband MEMS sensor is electrically connected with the sigma-delta A / D modulator through a MEMS sensor electric connection pin, the sigma-delta A / D digital filter is electrically connected with the sigma-delta A / D modulator, and the sigma-delta A / D digital filter is electrically connected with the probe cable.

[0007] As a further technical scheme of the utility model, a top cover is detachably fixed to the top end of the probe shell, and a double-layer corrosion and waterproof structure is arranged on the top cover.

[0008] As a further technical scheme of the utility model, a limiting groove is formed in the top end of the probe shell, and a limiting block matched with the limiting groove is integrally formed and fixedly connected to the bottom of the top cover.

[0009] As a further technical scheme of the utility model: the double-layer corrosion-proof and waterproof structure includes O type rubber sealing washer, the O type rubber sealing washer is embedded in the limiting groove, the bottom surface of O type rubber sealing washer is in contact with the bottom surface of limiting groove, the top surface of O type rubber sealing washer is in contact with the bottom surface of limiting block.

[0010] As a further technical scheme of the utility model: the double-layer corrosion-proof and waterproof structure includes anti-pulling limiting head, one end of probe cable passes through the top cover and is electrically connected with Σ-Δ A / D digital filter, the anti-pulling limiting head is installed at the inner wall gap of probe cable and top cover.

[0011] As a further technical scheme of the utility model: insulation rubber sheet is installed between Σ-Δ A / D modulator and wideband MEMS sensor.

[0012] As a further technical scheme of the utility model: the probe cable includes insulation layer and positive power line, negative power line, ground wire, negative output line and positive output line arranged in the insulation layer.

[0013] As a further technical scheme of the utility model: a plurality of screws are arranged on the top cover, and the screws are used to detachably fix the top cover on the probe shell.

[0014] As a further technical scheme of the utility model: the working frequency range of the wideband MEMS sensor is 10-500Hz.

[0015] As a further technical scheme of the utility model: the probe shell and the top cover are made of corrosion-proof and waterproof insulation engineering plastic.

[0016] In summary, the utility model includes at least one of the following beneficial technical effects:

[0017] 1. The utility model discloses a city geological safety ground pulsation early warning system probe, which is characterized in that: a Σ-Δ A / D digital filter, a Σ-Δ A / D modulator and a wideband MEMS sensor are arranged in the probe shell, and a probe cable is connected to the Σ-Δ A / D digital filter, wherein the Σ-Δ A / D digital filter has adjustable passband and can eliminate power frequency interference, and the Σ-Δ A / D modulator realizes self-adaptive adjustment of sensitivity. The probe shell and the top cover adopt a sealing structure with a waterproof level of IP68, and a low-power wireless transmission module is built-in. The utility model has high sensitivity vibration detection, environmental noise suppression, inclination automatic correction and remote monitoring capability, significantly reduces the false alarm rate of geological disasters, and is suitable for long-term deployment in cities and remote areas.

[0018] 2. The ground pulsation sensor of this invention employs a MEMS (Micro Electro Mechanical System) sensor, which senses ground pulsation vibration acceleration signals through gravity balance and converts them into high-precision digital signals. Its main performance characteristics are as follows:

[0019] It exhibits excellent frequency response. The amplitude and phase frequency response curves are flat straight lines within the DC-500Hz range.

[0020] Signal distortion is less than 0.003%, i.e., instantaneous dynamic distortion is above 90dB;

[0021] The sensor directly outputs a 24-bit digital signal per sample point.

[0022] It can automatically identify and correct the tilt angle perpendicular to the Earth's center. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the present invention.

[0024] Figure 2 This is a top view of the present invention.

[0025] Reference numerals: 1. Probe housing; 2. Wideband MEMS sensor; 3. Σ-ΔA / D digital filter; 4. Σ-ΔA / D modulator; 5. MEMS sensor electrical connection pin; 6. Probe cable; 7. Top cover; 8. O-ring rubber seal; 9. Anti-pull limit tie; 10. Insulating rubber sheet; 11. Screw. Detailed Implementation

[0026] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0027] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] Example 1:

[0030] Reference Figure 1 This utility model discloses a probe for an urban geological safety ground pulsation early warning system. It includes a probe housing 1 and a sensor assembly and signal processing circuit installed within the housing 1. The sensor assembly includes a wideband MEMS sensor 2. The signal processing circuit integrates a Σ-ΔA / D digital filter 3 and a Σ-ΔA / D modulator 4. The wideband MEMS sensor 2 is electrically connected to the Σ-ΔA / D modulator 4 via a MEMS sensor electrical connection pin 5. The MEMS sensor electrical connection pin 5 uses a gold-plated spring pin structure with a contact resistance <0.1Ω. The Σ-ΔA / D digital filter 3 is electrically connected to the Σ-ΔA / D modulator 4, and a probe cable 6 is electrically connected to the Σ-ΔA / D digital filter 3. An insulating rubber sheet 10 is installed between the Σ-ΔA / D modulator 4 and the wideband MEMS sensor 2, with a vibration transmission attenuation rate <3dB.

[0031] Among them, the wideband MEMS sensor 2 operates in the frequency range of 10-500Hz and captures shallow vibrations; the Σ-ΔA / D digital filter 3 can suppress power frequency noise and mechanical vibration interference, and the passband can be adjusted according to the site environment; the Σ-ΔA / D modulator 4 can automatically adjust the sensitivity according to the signal strength.

[0032] The wideband MEMS sensor 2 features a gravity balance mechanism, outputs a 24-bit digital signal, has a dynamic range ≥90dB, and a distortion <0.003%. The Σ-ΔA / D digital filter 3 is equipped with a switchable power frequency suppression module, supporting 50Hz / 60Hz dual-mode noise cancellation. The Σ-ΔA / D modulator 4 includes an adaptive gain control circuit, with a sensitivity adjustment range of ±2g to ±16g.

[0033] The top of the probe housing 1 is detachably fixed with a top cover 7, which has a double-layer anti-corrosion and waterproof structure. A limiting groove is formed at the top of the probe housing 1, and a limiting block matching the limiting groove is integrally formed and fixedly connected to the bottom of the top cover 7. Both the probe housing 1 and the top cover 7 are made of anti-corrosion, waterproof, and insulating engineering plastic.

[0034] Reference Figure 2The top cover 7 is provided with a plurality of screws 11, which are used to detachably fix the top cover 7 to the probe housing 1. In this embodiment, there are nine screws 11, which are evenly distributed on the edge of the top surface of the top cover 7 and pass through the top cover 7 to be threadedly connected to the top of the probe housing 1. This arrangement not only facilitates disassembly, but also increases the sealing of the inside of the probe housing 1.

[0035] The double-layer anti-corrosion and waterproof structure includes an O-ring rubber sealing gasket 8, which is embedded in a limiting groove. The bottom surface of the O-ring rubber sealing gasket 8 contacts the bottom surface of the limiting groove, and the top surface of the O-ring rubber sealing gasket 8 contacts the bottom surface of the limiting block. The double-layer anti-corrosion and waterproof structure also includes a pull-out limiting tie 9. One end of the probe cable 6 passes through the top cover 7 and is electrically connected to the Σ-ΔA / D digital filter 3. The pull-out limiting tie 9 is installed in the gap between the probe cable 6 and the inner wall of the top cover 7. IP68 waterproof protection is achieved by screws 11 in conjunction with the O-ring rubber sealing gasket 8.

[0036] The probe cable 6 includes an insulation layer and a positive power line (VDD), a negative power line (VSS), a ground line (GND), a negative output line (-OUT), and a positive output line (+OUT) disposed within the insulation layer.

[0037] The Σ-ΔA / D digital filter 3 receives FPGA configuration parameters via the SPI interface to implement 50-60Hz notch filtering. The Σ-ΔA / D modulator 4 automatically switches between 16-bit and 24-bit modes based on signal strength. The ground pulsation signal is converted into a digital signal by the broadband MEMS sensor 2, and then adaptively filtered by the Σ-ΔA / D digital filter 3 to eliminate environmental noise. The Σ-ΔA / D modulator 4 enhances the signal in the effective frequency band (0.1-30Hz), and the signal is then uploaded to the monitoring center via a wireless module.

[0038] The implementation principle of this utility model is as follows: This utility model discloses a probe for an urban geological safety ground vibration early warning system. It incorporates a Σ-ΔA / D digital filter 3, a Σ-ΔA / D modulator 4, and a wideband MEMS sensor 2 within the probe housing 1. A probe cable 6 is connected to the Σ-ΔA / D digital filter 3. The Σ-ΔA / D digital filter 3 has an adjustable passband and can eliminate power frequency interference, while the Σ-ΔA / D modulator 4 achieves adaptive sensitivity adjustment. The probe housing 1 and top cover 7 adopt an IP68 waterproof sealing structure and incorporate a low-power wireless transmission module. This utility model features high-sensitivity vibration detection, environmental noise suppression, automatic tilt correction, and remote monitoring capabilities, significantly reducing the false alarm rate of geological disasters. It is suitable for long-term deployment in urban and remote areas.

[0039] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A probe for an urban geological safety ground pulsation early warning system, comprising a probe housing (1) and a sensor assembly and signal processing circuit installed within the probe housing (1), characterized in that, The sensor assembly includes a wideband MEMS sensor (2), the signal processing circuit integrates a Σ-ΔA / D digital filter (3) and a Σ-ΔA / D modulator (4), the wideband MEMS sensor (2) is electrically connected to the Σ-ΔA / D modulator (4) through a MEMS sensor electrical connection pin (5), the Σ-ΔA / D digital filter (3) is electrically connected to the Σ-ΔA / D modulator (4), and a probe cable (6) is electrically connected to the Σ-ΔA / D digital filter (3).

2. The probe for the urban geological safety ground vibration early warning system according to claim 1, characterized in that, The top of the probe housing (1) is detachably fixed with a top cover (7), and the top cover (7) is provided with a double-layer anti-corrosion and waterproof structure.

3. The probe for the urban geological safety ground vibration early warning system according to claim 2, characterized in that, The top of the probe housing (1) has a limiting groove, and the bottom of the top cover (7) is integrally formed and fixedly connected with a limiting block that matches the limiting groove.

4. The probe for the urban geological safety ground vibration early warning system according to claim 3, characterized in that, The double-layer anti-corrosion and waterproof structure includes an O-ring rubber sealing gasket (8), which is embedded in the limiting groove. The bottom surface of the O-ring rubber sealing gasket (8) is in contact with the bottom surface of the limiting groove, and the top surface of the O-ring rubber sealing gasket (8) is in contact with the bottom surface of the limiting block.

5. The probe for the urban geological safety ground vibration early warning system according to claim 2, characterized in that, The double-layer anti-corrosion and waterproof structure includes a pull-out limiting head (9). One end of the probe cable (6) passes through the top cover (7) and is electrically connected to the Σ-ΔA / D digital filter (3). The pull-out limiting head (9) is installed in the gap between the probe cable (6) and the inner wall of the top cover (7).

6. The probe for the urban geological safety ground vibration early warning system according to claim 1, characterized in that, An insulating rubber sheet (10) is installed between the Σ-ΔA / D modulator (4) and the broadband MEMS sensor (2).

7. The probe for the urban geological safety ground vibration early warning system according to claim 1, characterized in that, The probe cable (6) includes an insulation layer and positive power line, negative power line, ground line, negative output line and positive output line disposed within the insulation layer.

8. The probe for the urban geological safety ground vibration early warning system according to claim 2, characterized in that, The top cover (7) is provided with a plurality of screws (11), which are used to detachably fix the top cover (7) to the probe housing (1).

9. The probe for the urban geological safety ground pulsation early warning system according to claim 1, characterized in that, The wideband MEMS sensor (2) operates in a frequency range of 10-500Hz.

10. The probe for the urban geological safety ground vibration early warning system according to claim 2, characterized in that, Both the probe housing (1) and the top cover (7) are made of corrosion-resistant, waterproof, and insulating engineering plastic.

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