Underwater operation auxiliary wearable vital sign monitoring system based on magnetometer

Abstract

The invention discloses an underwater operation auxiliary wearable vital sign monitoring system based on a magnetometer. The system comprises a posture detection device worn at a wrist joint of an underwater operator, an acquisition and analysis platform for receiving and analyzing data of the underwater operator, and a cable for communication between the posture detection device and the acquisition and analysis platform; the posture detection device can monitor posture information of underwater operating personnel and send the information through a cable, the acquisition and analysis platform receives the information and analyzes the information to obtain estimation of vital signs of the current underwater operating personnel, and corresponding warning information can be sent out according to the estimated information. Therefore, a shoreside lifeguard is prompted to timely respond, and the life safety of the underwater operating personnel is effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of vital signs monitoring, and in particular to an underwater operation-assisted wearable vital signs monitoring system based on a magnetometer. Background Art

[0002] The drowning problem in underwater operations is a potential safety hazard that cannot be ignored. Due to differences in individual physical fitness and different water environments, it is inevitable that underwater workers will drown, which can cause injuries or even death. Data shows that 59,000 people drown in my country every year, which has attracted widespread attention from the society. The vital signs monitoring system plays a vital role in protecting the life safety of underwater workers.

[0003] At present, the existing vital signs monitoring systems mainly collect pulse signals or electrocardiogram signals. On the one hand, the use of related sensors usually requires holes to be opened on the monitoring device to facilitate the sensor to be close to the skin of the staff to collect parameters. However, the opening of holes will make waterproofing difficult and increase the cost of the monitoring device. On the other hand, such sensors may involve the wearing of physiological electrical signal collection patches, which will increase the complexity of wearing and introduce the risk of patch falling off, which will reduce the overall robustness of the monitoring system. Summary of the invention

[0004] The purpose of the present invention is to provide a wearable vital signs monitoring system for underwater operations based on a magnetometer, so as to monitor the magnetic data of the wearer when working underwater and send the information to a collection and analysis platform.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A magnetometer-based underwater operation-assisted wearable vital sign monitoring system, including: a posture detection device, a communication cable, and a collection and analysis platform.

[0007] The posture detection comprises a main control chip (5), a BUCK step-down circuit (2), a communication level converter (1), and a three-axis magnetometer (6), all of which are arranged on a posture monitoring device, and includes: a main control chip (5), a BUCK step-down circuit (2), a communication level converter (1), and a three-axis magnetometer (6); the three-axis magnetometer (6) is used to detect magnetic data of underwater workers; the three-axis magnetometer (6) is connected to the main control chip (5); the communication level converter (1) is connected to the main control chip (5); one end of the communication cable is connected to the communication level converter (1), and the other end is connected to a collection and analysis platform.

[0008] The BUCK step-down circuit (2), the communication level converter (1), and the three-axis magnetometer (6) are all connected to the main control chip (5) and function to reduce the voltage transmitted by the twisted pair to a certain value to supply power to the main control chip (5).

[0009] The posture detection device is used to detect the magnetic data of underwater workers.

[0010] One end of the communication cable is connected to a communication level converter, and the other end is connected to a collection and analysis platform. The magnetic data of the wearer is monitored in real time by a posture detection device, and the three-axis magnetic data is converted into a 485 differential signal by a communication level converter (1) and sent to the collection and analysis platform through a twisted pair cable. The rescuer determines whether the wearer is in a safe state by whether the collection and analysis platform issues an alarm.

[0011] Optionally, the wearable vital signs monitoring system for assisting underwater operations further comprises a USB interface (3); the USB interface (3) is connected to the main control chip (5); and the USB interface (3) is used for debugging.

[0012] Optionally, the wearable vital signs monitoring system for assisting underwater operations further comprises an LED; the LED is connected to the main control chip (5) and is used to display the working status of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 This is a schematic diagram of the structure of a wearable vital signs monitoring system for assisting underwater operations provided by the present invention.

[0015] Figure 2 A schematic diagram of the composition of a posture detection device worn by underwater workers provided by the present invention. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention, based on the implementation cases in the present invention, which belong to the scope of protection of the present invention.

[0017] The communication cables are stored in the reel on the shore or on the vessel, and longer cables can be released as the depth of underwater operations increases.

[0018] The present invention provides a wearable vital sign monitoring system for assisting underwater operations.

[0019] A magnetometer-based underwater operation-assisted wearable vital sign monitoring system comprises a three-axis magnetometer (6), a main control chip (5), a BUCK step-down circuit (2) and a communication level converter (1).

[0020] The three-axis magnetometer (QMC5883L) (6) is connected to the main control chip (STC8H8K64U) (5) via an IIC interface. The main control chip (5) collects data from the three-axis magnetometer at a frequency of 50 Hz, stores the data in a buffer inside the main control chip (5), sends the data in the buffer to the communication level converter (1) via a serial port once every 10 seconds, clears the buffer, and then restarts collecting data from the three-axis magnetometer (6).

[0021] The BUCK step-down circuit (2) comprises a switching power supply controller (MC34063), an input voltage peak absorption circuit and an output voltage filter. The input voltage is provided by a communication cable and passes through the input voltage peak absorption circuit to prevent damage to other circuits; the switching power supply controller monitors the output voltage in real time and stabilizes it at 5V, providing a stable and reliable power supply for other circuits; the output voltage filter ensures that the output voltage is as stable as possible.

[0022] The communication level converter (1) comprises a level conversion chip (SP485EN), ​​an impedance matching circuit and an interface peak absorption circuit. The level conversion chip is responsible for converting the TTL level signal sent by the serial port peripheral of the main control chip into a 485 protocol differential signal, and sending the 485 differential signal to the communication cable; the impedance matching circuit ensures the integrity of the high-speed signal; and the interface peak absorption circuit is responsible for protecting the level conversion chip from damage.

[0023] The communication cable comprises two sets of twisted pairs, a grounded metal shielding layer and a protective rubber layer. The two sets of twisted pairs are respectively used to transmit 485 differential signals and provide input power for the posture monitoring device.

[0024] A collection and analysis platform includes a data collection buffer program, a data filtering program, a waveform characteristic value calculation program and an abnormal state probability estimation program.

[0025] The data acquisition buffer program reads the data transmitted regularly by the posture monitoring device through the 485 differential signal interface included in the acquisition and analysis platform, and saves it into the built-in buffer. When the buffer is full, the data filter data is called to process the buffer data.

[0026] The data filtering program uses a Butterworth low-pass filter to filter and reduce noise on the corresponding waveform signal in the buffer. After the processing is completed, the waveform characteristic value calculation program is called to calculate the waveform characteristic values ​​of the three axes respectively.

[0027] The waveform eigenvalue calculation program calculates the square root amplitude, root mean square, skewness, kurtosis, peak factor, waveform factor and pulse index of the three axes of the magnetometer (6). There are 21 eigenvalues ​​of the three axes, which form a eigenvector. The abnormal state probability estimation program is called and the vector is used as an input parameter.

[0028] The abnormal state probability estimation program is mainly a decision tree. After inputting a vector composed of waveform feature values, it can output the probability that the current underwater worker is in an abnormal physiological state. If the probability value exceeds the threshold, the acquisition and analysis platform software will issue an alarm message.

[0029] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0030] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the device and its core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A magnetometer-based underwater operation-assisted wearable vital signs monitoring system, characterized in that: include: Posture detection device worn on the wrist of underwater workers, data collection and analysis platform, and communication cable; The communication cable is mainly composed of two sets of twisted pair wires, which are used to transmit 485 communication signals and power the attitude detection device respectively; and it contains a tension steel wire (wrapped with EPDM insulation rubber) to prevent the cable from breaking.

2. The posture monitoring device according to claim 1, characterized in that: The device is composed of a three-axis magnetometer (6), a main control chip (5), a BUCK step-down circuit (2) and a communication level converter (1), and is installed on PCB1 and PCB2; The shell is made of ABS plastic, and the shell is divided into an upper part and a lower part. PCB1 and PCB2 are assembled in the lower part of the shell, and PCB1 and PCB2 are separated by a nylon column; the upper part of the shell is assembled on the lower part of the shell, and a waterproof rubber ring needs to be installed on the contact part of the two; after assembly, epoxy resin is used for waterproofing.

3. The data collection and analysis platform according to claim 1, characterized in that: First, the acquisition and analysis platform reads the three-axis magnetic data transmitted by the device through the 485 bus interface (4); Second, the analysis platform uses a Butterworth filter to filter and reduce noise on magnetic data; Third, the square root amplitude, root mean square, skewness, kurtosis, peak factor, waveform factor and pulse index of the waveform signal after noise reduction processing, a total of 7 signal indicators, and a total of 21 indicators in three axes form a feature vector; Fourth, the feature vector is input into the pre-trained decision tree classifier to obtain the probability value of the underwater worker being in an abnormal state; Fifth, whether to issue an alarm depends on whether the abnormal probability exceeds the threshold.

4. The PCB 1 according to claim 2 comprises a three-axis magnetometer (6) and a main control chip (5), which encodes the three-axis magnetic data into floating point numbers, identifies the wearer's behavior through a decision tree classifier, and sends it to the collection and analysis platform using a communication level converter.

5. The PCB 2 according to claim 2 comprises a BUCK step-down circuit (2) and a communication level converter (1). The BUCK step-down circuit (2) is used to reduce the voltage transmitted by the cable to a suitable value to supply power to the three-axis magnetometer (6), the main control chip (5), and the communication level converter (1); the communication level converter (1) is used to convert the TTL signal sent by the main control chip (5) into a 485 differential signal.

Images