Optical terminal intensity meter and earthquake monitoring service system

Abstract

The utility model discloses an optical terminal intensity instrument and earthquake monitoring service system, wherein, the optical terminal intensity instrument includes optical fiber modem and MEMS sensor module, the optical fiber modem includes MCU and the optical communication module of electric connection with MCU, the optical communication module is used for realizing network access and data upload, the MEMS sensor module is electric connection with MCU, the MEMS sensor module is used for the real -time collection of earthquake intensity data, the optical fiber modem is used for providing the double data transmission channel including broadband communication and earthquake intensity data, the utility model provides technical scheme, embeds MEMS sensor in the optical fiber modem, provides more dense, more efficient, more economic solution for earthquake early warning and intensity speed report.

Description

Technical Field

[0001] This utility model relates to the field of earthquake monitoring equipment technology, and in particular to an optical terminal intensity meter and an earthquake monitoring service system. Background Technology

[0002] Traditional earthquake recording and measurement require setting up equipment such as seismographs and intensity meters at specific station locations, and involves complex installation and debugging processes, as well as dedicated personnel for equipment maintenance, which is very costly and greatly limits the number of devices that can be installed and the widespread deployment of earthquake monitoring networks.

[0003] Meanwhile, the noise level of a single seismic intensity meter currently in use is around 0.40 mg, the noise density is around 70 ug / √Hz, and the dynamic range is around 75 dB. This results in insufficient resolution of small earthquake information, insufficient dynamic amplitude of data acquisition, and problems such as amplitude limiting for large earthquakes and low signal-to-noise ratio during earthquake detection. Consequently, the intensity meter cannot effectively extract complete earthquake information, leading to the loss of some earthquake data during earthquake early warning data acquisition.

[0004] With the development of fiber optic communication technology, fiber optic modems are widely used for network access in homes and businesses. Given the current state of technology, how to reuse existing network infrastructure to achieve low-cost, high-density earthquake monitoring is a new challenge in the field of earthquake monitoring. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, this utility model provides an optical terminal intensity meter and an earthquake monitoring service system, which embeds a MEMS sensor module in an optical fiber modem, providing a denser, more efficient, and more economical solution for earthquake early warning and intensity rapid reporting.

[0006] A light terminal intensity meter, comprising:

[0007] An optical fiber modem, comprising an MCU and an optical communication module electrically connected to the MCU; the optical communication module is used to enable network access and data upload.

[0008] The MEMS sensor module is electrically connected to the MCU; the MEMS sensor module is used to acquire seismic intensity data in real time.

[0009] The fiber optic modem is used to provide a dual data transmission channel, including broadband communication and the earthquake intensity data.

[0010] Preferably, the MEMS sensor module is electrically connected to the MCU via an I2C or SPI bus.

[0011] Preferably, the MEMS sensor module includes an accelerometer, a magnetometer, and a gyroscope.

[0012] Preferably, the MEMS sensor module includes two triaxial accelerometers and one magnetometer.

[0013] Preferably, it also includes a time synchronization module; the time synchronization module includes a time measurement module and a temperature-controlled crystal oscillator; the time measurement module is used to calibrate the 1PPS signal output by the BeiDou reference source and the 1PPS signal output by the temperature-controlled crystal oscillator.

[0014] Preferably, the MEMS sensor module includes two or more MEMS chips connected in parallel.

[0015] An earthquake monitoring service system includes a server and multiple optical terminal intensity meters, as described above, that are network-connected to the server.

[0016] The optical terminal intensity meter and earthquake monitoring service system provided by this utility model integrate fiber optic communication, MNMS sensing, and earthquake monitoring and early warning technologies. Utilizing MEMS technology, a MEMS sensor is embedded in the optical terminal (fiber optic modem), enabling it to meet the signal-to-noise ratio performance requirements for earthquake monitoring under normal conditions. Specifically, it has the following beneficial effects:

[0017] 1) Compared with the installation and maintenance costs of traditional earthquake monitoring equipment, optical terminal intensity meters have a wide range of installation locations, and the management and maintenance of the equipment are relatively simple and the cost is low.

[0018] 2) It utilizes existing telecommunications fiber optic networks, has no location requirements, and is easy to distribute and install optical terminal intensity meters. With the distributed deployment of optical terminal intensity meters, the server can perform comparative analysis of data from a large number of node devices to determine the earthquake source center and calculate the magnitude, as well as implement mechanisms such as rapid reporting and early warning.

[0019] 3) By utilizing telecommunications fiber optic networks and combining them with fiber optic NTP / PTP services, the error with the reference clock source is greatly reduced, ensuring the timeliness of seismic intensity data.

[0020] 4) Based on the distributed deployment of optical terminal intensity meters, there are many of them and the coverage area is wide, which can provide system service capacity of hundreds of thousands of units for system services (seismic network data).

[0021] Compared with existing technologies, the technical solution provided by this utility model innovatively embeds MEMS sensor modules into traditional optical network terminals to form an optical terminal intensity meter; through front-end sensing, data acquisition, real-time transmission, and analysis and processing of seismic wave data, it achieves earthquake monitoring and early warning capabilities, thereby changing the traditional way of earthquake recording and measurement, so that earthquake measurement is no longer limited to dedicated equipment and installation in specific locations, and reducing maintenance costs. Attached Figure Description

[0022] Figure 1 This is a frame diagram of the optical terminal intensity meter in this embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram showing the connection between the MEMS sensor module and the MCU in an embodiment of this utility model;

[0024] Figure 3 This is a circuit block diagram of the built-in MEMS module in the optical terminal in this embodiment of the present invention;

[0025] Figure 4 This is a diagram of the optical terminal intensity meter and earthquake monitoring service network in an embodiment of this utility model;

[0026] Figure 5 This is a functional diagram of the earthquake monitoring service in an embodiment of the present utility model;

[0027] Figure 6 This is a schematic diagram of the parallel circuit of the two MEMS chips in an embodiment of this utility model;

[0028] Figure 7 This is a schematic diagram of the time synchronization module in an embodiment of this utility model. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] An optical terminal intensity meter and earthquake monitoring service system, such as Figures 1 to 7 As shown.

[0031] The optical terminal intensity meter includes a fiber optic modem and a MEMS sensor module.

[0032] Fiber optic modems, also known as optical terminals, are the primary devices for network access in homes and businesses today. A fiber optic modem includes an MCU (microcontroller unit), the main control chip, and an optical communication module electrically connected to the MCU. The optical communication module is used to enable network access and data upload.

[0033] MEMS, or Microelectromechanical Systems, involves electrically connecting a MEMS sensor module to the MCU of a fiber optic modem. The MEMS sensor module is used for real-time acquisition of seismic intensity data. The fiber optic modem provides dual data transmission channels, including broadband communication and seismic intensity data. Thus, the integration of the fiber optic modem and MEMS sensor enables automated and intelligent seismic intensity monitoring.

[0034] like Figure 1 As shown, the optical communication module provides both earthquake early warning service data links and broadband service data links. The MCU in the fiber optic modem performs three main functions: data processing for the primary function, attitude correction control of the optical terminal intensity meter, and automatic registration of the optical terminal intensity meter as a terminal to the server. The MEMS sensor module is electrically connected to the MCU via I2C or SPI bus. The MEMS sensor module includes two triaxial accelerometers and one magnetometer, which are connected to the main control chip via I2C / SPI interfaces.

[0035] The working principle of an optical terminal intensity meter: Each optical terminal intensity meter has unique identification information. After powering on, it automatically registers with the server to determine its location and status information. During monitoring, such as... Figure 2 As shown, acceleration and magnetic field data in the directions of gravity and geomagnetic fields in the external environment are acquired in real time by the main control chip through the MEMS sensor module. After analysis of the gravitational acceleration centroid and geomagnetic field vector, the attitude of the optical terminal intensity meter is calculated using a built-in algorithm. If the attitude deviation exceeds a preset value, the attitude correction module is triggered to automatically adjust the device attitude to ensure measurement accuracy. After the corrected data is processed by the main control chip, it is quickly uploaded to the seismic network center via the optical communication module using a fiber optic network, realizing real-time monitoring and transmission of seismic intensity data.

[0036] The entire optical terminal intensity meter is based on a fiber optic modem and integrates a MEMS sensor module, a main control chip, an optical communication module, and automatic registration and attitude correction functions, forming a complete earthquake intensity monitoring system. It significantly simplifies the installation and maintenance process of earthquake monitoring equipment, reduces construction costs, improves data transmission efficiency and measurement accuracy, and provides an efficient, economical, and reliable solution for earthquake early warning and rapid intensity reporting.

[0037] Furthermore, the MEMS sensor module also includes a gyroscope, which allows the optical terminal device to be installed at any position and angle. For example... Figure 3As shown, a low-noise power supply module is used to provide a reference voltage to the MEMS sensor module to reduce noise in the acquired data. Meanwhile, the MEMS employs a 9-axis chip containing an accelerometer, gyroscope, and magnetometer. An optical terminal intensity meter is connected to the MEMS module via a power and communication interface.

[0038] Furthermore, such as Figure 6 As shown, the MEMS sensor module includes two or more MEMS chips connected in parallel. Modern intensity meters, widely used in earthquake detection, have noise levels around 0.40 mg, a noise density of around 70 μg / √Hz, and a dynamic range of around 75 dB. This results in insufficient resolution for small earthquake information, inadequate dynamic amplitude acquisition leading to amplitude limiting during large earthquakes, low signal-to-noise ratio, and an inability to effectively extract complete earthquake information, causing the loss of some earthquake data during earthquake early warning data acquisition. The dual-MEMS chip solution, however, connects two low-noise, low-power, triaxial accelerometer MEMS chips in parallel to acquire earthquake information. Combined with software filtering and processing of common noise signals, a more realistic earthquake signal can be obtained.

[0039] Specifically, the dual MEMS chip solution achieves high-precision seismic waveform acquisition through a fusion algorithm, resulting in noise of approximately 1.4 μg, noise density of approximately 0.1 μg / √Hz, and a dynamic range of approximately 120 dB. This improves the instrument's noise level and expands its dynamic range, enabling the acquisition of even weaker seismic signals.

[0040] Understandably, the parallel noise reduction method is not limited to two dual-accelerometer MEMS chips, but can also include more than two.

[0041] Furthermore, it also includes a timing module; the timing module includes a time measurement module and a temperature-controlled crystal oscillator; the time measurement module is used to calibrate the 1PPS signal output from the BeiDou reference source and the 1PPS signal output from the temperature-controlled crystal oscillator.

[0042] Specifically, such as Figure 7 As shown, the timing module forms a loop control. It uses the BeiDou reference source to output a reference 1PPS signal. The time measurement module measures the time interval of asynchrony between the 1PPS signal output by the temperature-controlled crystal oscillator and the BeiDou 1PPS signal. The measured value is filtered by the processor to calculate the frequency offset, which is then converted into a control voltage via D / A converter to adjust the output frequency of the temperature-controlled crystal oscillator. By repeatedly calculating the time interval of asynchrony between the 1PPS signal output by the temperature-controlled crystal oscillator and the BeiDou 1PPS signal, the time can be continuously calibrated to ultimately obtain a precise time signal.

[0043] An earthquake monitoring service system includes a server and multiple optical terminal intensity meters, as described above, that are network-connected to the server.

[0044] Specifically, such as Figure 4 As shown, the optical terminal intensity meter is connected to the earthquake monitoring and early warning system. The optical terminal is usually placed in the corner of the building or household network entrance. The optical terminal uses optical fiber for uplink and communicates with the Internet and server through the telecommunications backbone network.

[0045] In terms of software, the optical terminal intensity meter uses the existing CSTP client program to collect 9-axis data of MEMS acceleration, gyroscope, and magnetometer in real time. It then aligns the data according to the current system time and calculates orthogonal acceleration data. The mutually orthogonal acceleration data are transmitted to the remote server via the network according to the CSTP protocol. The relevant components of the server then perform necessary processing or forwarding of the data.

[0046] like Figure 5 The diagram illustrates the relationship between the optical terminal intensity meter and the server, the device configuration and the registration server, and the NTP / PTP network's time synchronization with the optical terminal intensity meter via fiber optic communication. In other words, the combination of NTP / PTP network time synchronization service and fiber optic communication at the terminal reduces the number of time synchronization server layers and transmission delays, significantly minimizing time synchronization errors and ensuring the timeliness of seismic intensity data processing.

[0047] Therefore, by using precise local time to identify acceleration data on the optical terminal intensity meter, packaging the data with the CSTP protocol, and sending it to the server for reception and processing, it is possible to realize the determination of earthquake focal center and magnitude, as well as mechanisms for rapid reporting and early warning.

[0048] Meanwhile, the optical terminal intensity meter product can automatically generate unique station information through the configuration server, so as to better manage the location, movement, and replacement of the equipment, and realize distributed deployment.

[0049] The above is a description of the present utility model to help understand it; however, the implementation of the present utility model is not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A light terminal intensity meter, characterized in that, include: An optical fiber modem, the optical fiber modem including an MCU and an optical communication module electrically connected to the MCU; The optical communication module is used to enable network access and data upload; The MEMS sensor module is electrically connected to the MCU; the MEMS sensor module is used to acquire seismic intensity data in real time. The fiber optic modem is used to provide a dual data transmission channel, including broadband communication and the earthquake intensity data.

2. The optical terminal intensity meter as described in claim 1, characterized in that, The MEMS sensor module is electrically connected to the MCU via an I2C or SPI bus.

3. The optical terminal intensity meter as described in claim 1, characterized in that, The MEMS sensor module includes an accelerometer, a magnetometer, and a gyroscope.

4. The optical terminal intensity meter as described in claim 3, characterized in that, The MEMS sensor module includes two triaxial accelerometers and one magnetometer.

5. The optical terminal intensity meter as described in claim 1, characterized in that, It also includes a timing module electrically connected to the MCU; the timing module includes a time measurement module and a temperature-controlled crystal oscillator; the time measurement module is used to calibrate the 1PPS signal output from the BeiDou reference source and the 1PPS signal output from the temperature-controlled crystal oscillator.

6. The optical terminal intensity meter as described in any one of claims 1 to 5, characterized in that, The MEMS sensor module includes two or more MEMS chips connected in parallel.

7. An earthquake monitoring service system, characterized in that, It includes a server, and multiple optical terminal intensity meters networked with the server as described in any one of claims 1 to 6.

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