Earthquake detection device based on geomagnetic sensor and alarm equipment

Abstract

The utility model provides a geomagnetic sensor-based earthquake detection device and alarm equipment. The geomagnetic sensor-based earthquake detection device comprises a circuit board; the three-axis fluxgate sensor assembly is installed on the circuit board and used for collecting three-dimensional magnetic field signals; the sensor signal processing chip is mounted on the circuit board, is in communication connection with the three-axis fluxgate sensor assembly, and is used for receiving the three-dimensional magnetic field signal and comparing the three-dimensional magnetic field signal with a calibration signal; the earthquake detection algorithm chip is mounted on the circuit board, is in communication connection with the sensor signal processing chip and is used for receiving an offset three-dimensional magnetic field signal deviating from a calibration signal; the accelerometer and gyroscope chip is installed on the circuit board and used for collecting three-dimensional attitude data of the circuit board and judging whether the offset three-dimensional magnetic field signal is caused by displacement of the circuit board or not according to the three-dimensional attitude data; and the earthquake detection algorithm chip generates an earthquake alarm signal from an offset three-dimensional magnetic field signal which is not caused by the displacement of the circuit board, so that earthquake detection is completed. The utility model has the advantages of high accuracy, high sensitivity and low power consumption.

Description

Technical Field

[0001] The utility model belongs to the field of wireless intelligent sensors, and in particular relates to an earthquake detection device and an alarm device based on a geomagnetic sensor. Background Art

[0002] As people's living standards continue to improve, the requirements for earthquake alarm equipment in life and production are getting higher and higher. Traditional equipment has a certain delay in earthquake alarms and low accuracy, which results in people having no time to avoid the disasters caused by earthquakes, resulting in casualties and damage to production equipment. Utility Model Content

[0003] The purpose of the utility model is to provide an earthquake detection device and alarm equipment based on a geomagnetic sensor, which has the advantages of high accuracy, high sensitivity and low power consumption. The earthquake detection device based on a geomagnetic sensor provided by the utility model can sense the environmental changes around the setting point in real time and provide more timely earthquake early warning signals.

[0004] To achieve the above-mentioned purpose, the utility model provides an earthquake detection device based on a geomagnetic sensor, which includes: a circuit board; a three-axis fluxgate sensor assembly, which is installed on the circuit board and is used to collect three-dimensional magnetic field signals; a sensor signal processing chip, which is installed on the circuit board and is communicatively connected to the three-axis fluxgate sensor assembly, and is used to receive the three-dimensional magnetic field signal and compare it with a calibration signal; an earthquake detection algorithm chip, which is installed on the circuit board and is communicatively connected to the sensor signal processing chip, and receives an offset three-dimensional magnetic field signal that deviates from the calibration signal; an accelerometer and gyroscope chip, which is installed on the circuit board and is used to collect three-dimensional posture data of the circuit board, and determine whether the offset three-dimensional magnetic field signal is caused by circuit board displacement through the three-dimensional posture data; the earthquake detection algorithm chip generates an earthquake alarm signal from the offset three-dimensional magnetic field signal that is not caused by circuit board displacement, and completes earthquake detection.

[0005] Preferably, the earthquake detection device based on the geomagnetic sensor also includes: an accelerometer and a gyroscope chip, which is installed on the circuit board and is used to collect three-dimensional posture data of the circuit board; the accelerometer and the gyroscope chip are communicatively connected with the earthquake detection algorithm chip to transmit multiple sets of three-dimensional posture data for eliminating the displacement of the circuit board.

[0006] Optionally, the earthquake detection algorithm chip adopts a PNI 13658 chip.

[0007] Optionally, the three-axis fluxgate sensor assembly includes an X-axis sensor, a Y-axis sensor, and a Z-axis sensor, and the X-axis sensor, the Y-axis sensor, and the Z-axis sensor are respectively connected to a sensor signal processing chip.

[0008] Optionally, the X-axis sensor and the Y-axis sensor use a PNI 13104 chip; and the Z-axis sensor uses a PNI 13101 chip.

[0009] Optionally, the X-axis sensor, the Y-axis sensor, and the Z-axis sensor are mounted on the same surface of the circuit board.

[0010] Optionally, the sensor signal processing chip adopts a PNI 13156 chip.

[0011] The utility model also provides an earthquake alarm device based on a geomagnetic sensor, which includes: an earthquake detection device based on a geomagnetic sensor as mentioned above; an I2C interface is provided on the circuit board in the earthquake detection device, and the I2C interface is connected to the alarm terminal, and the earthquake alarm signal is transmitted to the alarm terminal through the I2C interface to realize an earthquake alarm.

[0012] Optionally, the alarm terminal includes a flashing indicator light and a buzzer, and the flashing indicator light and the buzzer are respectively connected to the circuit board via the I2C interface.

[0013] To sum up, compared with the prior art, the earthquake detection device and alarm equipment based on geomagnetic sensors provided by the utility model have the following beneficial effects: by setting a three-axis fluxgate sensor assembly, the magnetic field changes around the earthquake detection device can be obtained in real time, thereby improving the timeliness of the earthquake detection device; further, by setting an earthquake detection algorithm chip, the three-dimensional magnetic field signal is compared with the calibration signal and the three-dimensional posture data, thereby improving the accuracy of the earthquake detection device and effectively avoiding false warnings; at the same time, an I2C communication interface is integrated on the circuit board, and the earthquake detection device can be controlled and upgraded at any time through the I2C interface, and can be connected and used with alarm terminal products of different forms. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a module schematic diagram of an earthquake detection device based on a geomagnetic sensor of the utility model;

[0015] Figure 2 It is a schematic diagram of the connection between the three-axis fluxgate sensor assembly and the sensor signal processing chip in the earthquake detection device based on the geomagnetic sensor of the utility model;

[0016] Figure 3 The module diagram of the earthquake alarm device based on geomagnetic sensor of the utility model is shown in FIG. DETAILED DESCRIPTION

[0017] The following will be combined with the appended examples in the present utility model Figure 1 ~Attached Figure 3 , the technical scheme, structural features, objectives achieved and effects in the embodiments of the utility model are described in detail.

[0018] It should be noted that the drawings are in a very simplified form and use non-precise proportions. They are only used to conveniently and clearly assist in explaining the implementation methods of the utility model, and are not used to limit the conditions for the implementation of the utility model. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed by the utility model without affecting the efficacy and purpose that can be achieved by the utility model.

[0019] It should be noted that, in the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only the elements explicitly listed, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0020] The utility model provides an earthquake detection device 100 based on a geomagnetic sensor, such as Figure 1As shown, the earthquake detection device 100 includes: a circuit board 10, on which a plurality of connection sites are provided for connecting different types of sensing devices and / or chips; a three-axis fluxgate sensor assembly 101, which is mounted on the circuit board 10 through the connection sites and is used to collect three-dimensional magnetic field signals; a sensor signal processing chip 102, which is mounted on the circuit board 10 through the connection sites and is in communication connection with the three-axis fluxgate sensor assembly 101, and is used to receive the three-dimensional magnetic field signal and compare it with the calibration signal stored in the sensor signal processing chip 102 to determine whether the three-dimensional magnetic field signal is offset; wherein the calibration signal is obtained by manually holding the earthquake detection device 100 in the air in the use environment and performing 10 8-shaped rotation movements to obtain 10 collected and stored signals by the three-axis fluxgate sensor assembly 101. The magnetic field signals of the X, Y, and Z axis sensors are sent to the earthquake monitoring algorithm chip 103 for average calculation to obtain an average three-dimensional magnetic field signal as a calibration signal; the earthquake detection algorithm chip 103 is installed on the circuit board 10 through the connection site and is connected to the sensor signal processing chip 102 for communication, and the earthquake detection algorithm chip 103 receives the offset three-dimensional magnetic field signal that deviates from the calibration signal; the accelerometer and gyroscope chip 104 is installed on the circuit board 10 through the connection site to collect the three-dimensional posture data of the circuit board 10, and judge whether the offset three-dimensional magnetic field signal is caused by the displacement of the circuit board 10 through the three-dimensional posture data; the earthquake detection algorithm chip 103 generates an earthquake alarm signal from the offset three-dimensional magnetic field signal that is not caused by the displacement of the circuit board 10, and the earthquake detection can be completed. As an optional embodiment, the earthquake detection algorithm chip 103 adopts the PNI 13658 chip. By adopting the PNI 13658 chip, the analog three-dimensional magnetic field signal can be converted into a digital signal, which is used as the data basis required for subsequent earthquake detection and judgment, thereby improving the data processing efficiency.

[0021] Further, if Figure 1 As shown, in order to ensure the accuracy of the earthquake detection device 100, the accelerometer and gyroscope chip 104 is communicatively connected with the earthquake detection algorithm chip 103, and the accelerometer and gyroscope chip 104 can collect multiple groups of three-dimensional posture data in real time. The accelerometer and gyroscope chip 104 transmits the multiple groups of three-dimensional posture data to the earthquake detection algorithm chip 103, and the earthquake detection algorithm chip 103 compares the first three-dimensional posture data and the second three-dimensional posture data of adjacent time periods. If the first three-dimensional posture data and the second three-dimensional posture data are the same, it means that the circuit board 10 has not moved, that is, the offset three-dimensional magnetic field signal is not due to the magnetic field change caused by the displacement of the circuit board 10, and the magnetic field change is the magnetic field change when an earthquake occurs.

[0022] On the contrary, if there is a difference between the first three-dimensional posture data and the second three-dimensional posture data, it means that the circuit board 10 has moved, and the three-axis fluxgate sensor assembly 101 needs to re-collect the three-dimensional magnetic field signal and compare it with the calibration signal. At the same time, the accelerometer and gyroscope chip 104 also needs to re-collect the three-dimensional posture data to determine the position of the circuit board 10, so as to reduce the impact of the displacement of the circuit board 10 on earthquake detection and improve the accuracy of earthquake detection.

[0023] like Figure 2 As shown, the three-axis fluxgate sensor assembly 101 includes an X-axis sensor 111, a Y-axis sensor 112, and a Z-axis sensor 113, and the X-axis sensor 111, the Y-axis sensor 112, and the Z-axis sensor 113 are respectively connected to the sensor signal processing chip 102. Because geomagnetism is a spatial signal (i.e., including three directions of X, Y, and Z), it is necessary to measure all three-dimensional signals. Specifically, the X-axis sensor 111 and the Y-axis sensor 112 use the PNI 13104 chip respectively, and the Z-axis sensor 113 uses the PNI 13101 chip. The PNI 13104 chip is the X-axis sensor 111 and the Y-axis sensor 112 when measuring geomagnetic signals in three-dimensional space, that is, a horizontal direction sensor; the PNI 13101 chip is the Z-axis sensor 113, that is, a direction perpendicular to the sea level. At the same time, in this embodiment, the X-axis sensor 111, the Y-axis sensor 112, and the Z-axis sensor 113 are all installed on the same side of the circuit board 10, and the collected signals are reported separately through the sensor signal processing chip 102, and the three sensors themselves are not related.

[0024] Furthermore, in this embodiment, the sensor signal processing chip 102 adopts a PNI 13156 chip, which is an ASIC (special purpose integrated circuit) with a geomagnetic induction algorithm.

[0025] It should be noted that the working principle of the utility model is as follows: calibration process: when working for the first time, it is necessary to manually collect a first three-dimensional magnetic field signal in the use environment as a calibration signal to be used later. The specific calibration process is to hold the earthquake detection device 100 and make an 8-shaped rotation in the air. The earthquake detection algorithm chip 103 can automatically identify and enter the calibration mode. During the 8-shaped rotation, the earthquake detection algorithm chip 103 can automatically receive the three-dimensional magnetic field signal collected by the three-axis fluxgate sensor assembly 101, make 10 8-shaped rotations, indicating that the calibration is completed, and calculate the average value of the 10 first three-dimensional magnetic field signals received to obtain the average three-dimensional magnetic field signal as the calibration signal. After calibration, the sensor signal processing chip 102 compares the second three-dimensional magnetic field signal collected from the three-axis fluxgate sensor assembly 101 with the calibration signal. If there is a deviation between the second three-dimensional magnetic field signal and the calibration signal, the second three-dimensional magnetic field signal is sent to the earthquake detection algorithm chip 103 as the offset magnetic field signal. The earthquake detection algorithm chip 103 then compares the three-dimensional attitude data of the adjacent time periods of the accelerometer and gyroscope chip 104 to determine whether it is a magnetic field change caused by the earthquake or a magnetic field change caused by the movement of the circuit board 10. The accelerometer and gyroscope chip 104 includes an accelerometer and a gyroscope, wherein the gyroscope is easily affected by measurement errors, noise and drift, so it needs to be calibrated in combination with the accelerometer.

[0026] The utility model also provides an earthquake alarm device 200 based on a geomagnetic sensor, such as Figure 3 As shown, it includes: an earthquake detection device 100 based on a geomagnetic sensor as described in the above embodiment; an I2C interface 11 is provided on the circuit board 10 in the earthquake detection device 100, and the I2C interface 11 is connected to the alarm terminal 201, and the earthquake alarm signal is transmitted to the alarm terminal 201 through the I2C interface 11 to realize earthquake alarm. At the same time, the I2C interface 11 can also be used as a communication interface for controlling and upgrading the earthquake device, so as to update and upgrade the storage content in each chip on the circuit board 11.

[0027] As an optional embodiment, the alarm terminal 201 includes a flashing indicator light and a buzzer, and the flashing indicator light and the buzzer are respectively connected to the circuit board through the I2C interface. When the earthquake alarm signal is received, the flashing indicator light flashes periodically and the buzzer sounds to realize the earthquake alarm.

[0028] To sum up, compared with the prior art, the earthquake detection device and alarm equipment based on geomagnetic sensors provided by the utility model can obtain the magnetic field changes around the earthquake detection device in real time by setting a three-axis fluxgate sensor assembly 101, thereby improving the timeliness of the earthquake detection device 100; further, by setting an earthquake detection algorithm chip 103, the three-dimensional magnetic field signal is compared with the calibration signal and the three-dimensional posture data, thereby improving the accuracy of the earthquake detection device and effectively avoiding false warnings; at the same time, an I2C communication interface 11 is integrated on the circuit board 10, and the earthquake detection device can be controlled and upgraded at any time through the I2C interface 11, and can be connected and used with alarm terminals 201 of different forms.

[0029] Although the content of the utility model has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the utility model. After reading the above content, various modifications and substitutions of the utility model will be obvious to those skilled in the art. Therefore, the protection scope of the utility model should be limited by the attached claims.

Claims

1. An earthquake detection device based on a geomagnetic sensor, characterized in that: include: Circuit boards; A three-axis fluxgate sensor assembly, which is mounted on the circuit board and is used to collect three-dimensional magnetic field signals; a sensor signal processing chip mounted on the circuit board and in communication with the three-axis fluxgate sensor assembly, for receiving the three-dimensional magnetic field signal and comparing it with a calibration signal; An earthquake detection algorithm chip is mounted on the circuit board and is in communication with the sensor signal processing chip to receive an offset three-dimensional magnetic field signal that deviates from a calibration signal; An accelerometer and gyroscope chip, which is mounted on the circuit board and used to collect three-dimensional posture data of the circuit board, and determine whether the offset three-dimensional magnetic field signal is caused by the displacement of the circuit board through the three-dimensional posture data; The earthquake detection algorithm chip generates an earthquake alarm signal from the offset three-dimensional magnetic field signal that is not caused by the displacement of the circuit board, thereby completing the earthquake detection.

2. The earthquake detection device based on geomagnetic sensor according to claim 1, characterized in that: The accelerometer and gyroscope chip are communicatively connected with the earthquake detection algorithm chip, and transmit multiple sets of three-dimensional posture data to the earthquake detection algorithm chip; the earthquake detection algorithm chip compares the first three-dimensional posture data and the second three-dimensional posture data of adjacent time periods. If the first three-dimensional posture data and the second three-dimensional posture data are the same, it means that the circuit board has not moved.

3. The earthquake detection device based on geomagnetic sensor according to claim 1, characterized in that: The earthquake detection algorithm chip adopts the PNI 13658 chip.

4. The earthquake detection device based on geomagnetic sensor according to claim 1, characterized in that: The three-axis fluxgate sensor assembly includes an X-axis sensor, a Y-axis sensor, and a Z-axis sensor, and the X-axis sensor, the Y-axis sensor, and the Z-axis sensor are respectively connected to a sensor signal processing chip.

5. The earthquake detection device based on geomagnetic sensor according to claim 4, characterized in that: The X-axis sensor and the Y-axis sensor use the PNI 13104 chip; the Z-axis sensor uses the PNI 13101 chip.

6. The earthquake detection device based on geomagnetic sensor according to claim 4, characterized in that: The X-axis sensor, the Y-axis sensor, and the Z-axis sensor are mounted on the same surface of the circuit board.

7. The earthquake detection device based on geomagnetic sensor according to claim 1, characterized in that: The sensor signal processing chip adopts PNI 13156 chip.

8. An earthquake alarm device based on geomagnetic sensors, characterized in that: include: An earthquake detection device based on a geomagnetic sensor as claimed in any one of claims 1 to 7; An I2C interface is provided on the circuit board in the earthquake detection device, and the I2C interface is connected to the alarm terminal. The earthquake alarm signal is transmitted to the alarm terminal through the I2C interface to realize the earthquake alarm.

9. The earthquake alarm device based on geomagnetic sensor according to claim 8, characterized in that: The alarm terminal comprises a flashing indicator light and a buzzer, and the flashing indicator light and the buzzer are respectively connected to the circuit board through the I2C interface.

Images