CN102210588A - Method for detecting underwater respiratory rate and heart rate of diver in air diving - Google Patents
Method for detecting underwater respiratory rate and heart rate of diver in air diving Download PDFInfo
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- CN102210588A CN102210588A CN 201110159426 CN201110159426A CN102210588A CN 102210588 A CN102210588 A CN 102210588A CN 201110159426 CN201110159426 CN 201110159426 CN 201110159426 A CN201110159426 A CN 201110159426A CN 102210588 A CN102210588 A CN 102210588A
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Abstract
The invention belongs to the field of medical technology, in particular to a device for detecting underwater respiratory rate and heart rate of diver in air diving. The invention discloses a device for detecting underwater respiratory rate and heart rate of diver in air diving. The device is characterized by comprising a respiration sensor, a respiration detection pre-amplifying circuit, a heart rate sensor, a heart rate detection pre-amplifying circuit, a low-pass filter, a secondary amplifier, a microprocessor, a memory and a power supply, wherein the respiration sensor is connected with the low-pass filter through the respiration detection pre-amplifying circuit, and the heart rate sensor is connected with the low-pass filter through the heart rate detection pre-amplifying circuit; the low-pass filter, the secondary amplifier and the microprocessor are sequentially connected; the memory is connected with the microprocessor; the power supply is connected with the respiration sensor, a respiration detection circuit, the heart rate sensor, a heart rate detection circuit, the low-pass filter, the secondary amplifier, the microprocessor and the memory for power supply respectively.
Description
Technical field
The invention belongs to field of medical technology, be specifically related to the checkout gear of a kind of diver's air dive underwater breathing frequency and heart rate.
Background technology
At sea in submarine rescue, marine resources exploration and development, the underwater construction operation etc., diving operation has become important means.When diving operation, underwater environment factor such as water temperature, hydraulic pressure, current and oxygen system often exert an influence the careless slightly diving operation accident that very easily takes place to diver's physiological system.
In order to ensure diving safety, except overall understanding diving is made the land used environmental information and is guaranteed the diving equipment reliability, if can when diving operation, monitor and/or write down in real time diver's physical signs (especially respiratory frequency, heart rate situation), will be favourable guarantee diver's life security, greatly avoid the generation of diving operation accident.But existing respiratory frequency and heart rate detection instrument all are difficult to satisfy the requirement that detects under water.
Summary of the invention
Technical problem to be solved by this invention provides a kind of convenient and reliable diver's underwater breathing frequency and the checkout gear of heart rate, can satisfy underwater environment factor, diver's level of comfort and the requirement that instrument should be easy to assemble, monitoring in real time and record diver's respiratory frequency and heart rate index when being implemented in diving operation.
For this reason, the invention discloses the checkout gear of a kind of diver's air dive underwater breathing frequency and heart rate, it is characterized in that it comprises respiration pickup, the respiration detection pre-amplification circuit, heart rate sensor, the heart rate detection pre-amplification circuit, low pass filter, two-stage amplifier, microprocessor, memorizer and power supply, described respiration pickup is by the respiration detection pre-amplification circuit, described heart rate sensor is connected with low pass filter respectively by the heart rate detection pre-amplification circuit, low pass filter, two-stage amplifier, microprocessor connects successively, memorizer connects microprocessor, power supply respectively with respiration pickup, the respiration detection circuit, heart rate sensor, the heart rate detection circuit, low pass filter, two-stage amplifier, microprocessor, memorizer connects power supply.
In certain embodiments, described respiration pickup is an absolute pressure formula silicon pressure drag electric bridge sensor, and wherein preferred specification is the microminiature pressure transducer of 0～2MPa;
In certain embodiments, described respiration detection pre-amplification circuit is fixed in the withstand voltage box, and described withstand voltage box is installed on the low tension outlet of one-level decompressor by M10 screw thread and waterproof rubber gasket.
In certain embodiments, described heart rate sensor is an infrared sensor, and it comprises infrared heart rate measuring instrument and infrared probe, and infrared heart rate measuring instrument is bundled on diver's the forearm or shank, infrared probe is entangled on finger or the toe, is connected on the heart rate measuring instrument by cable.
In one embodiment, described respiration detection pre-amplification circuit is the AD620 differential amplifier circuit;
In one embodiment, the described heart rate detection pre-amplification circuit photoelectric current amplifying circuit that is the LM324 integrated transporting discharging;
In certain embodiments, described microprocessor is the C8051F340 single-chip microcomputer;
In one embodiment, described low pass filter is the second order Butterworth LPF, and its corner frequency is 7Hz.
In one embodiment, described power supply is a lithium battery;
In one embodiment, described lithium battery is connected with microprocessor with the electrical measurement circuit by charging, by Integrated Service Digital Network news agreement and microprocessor communication, is read parameters such as current voltage of lithium battery and dump energy by microprocessor.
In certain embodiments, described memorizer is the TF card, is convenient for changing, and uses the flash chip reliability higher.
For the time that record data begin to gather, in certain embodiments, described checkout gear also contains the perpetual calendar chip, and the perpetual calendar chip is with I
2C communication protocol is connected with microprocessor, directly by lithium battery power supply, and without on and off switch, can dead electricity to guarantee chip, keep correct clock and calendar.
For in certain embodiments, described checkout gear also contains communication module, is connected with microprocessor, so that can monitor diver's respiratory frequency and heart rate index in real time.
Checkout gear of the present invention has simple in structure, low in energy consumption, characteristics such as speed is fast, can measure breathing, the hrv parameter of human body in real time, can satisfy underwater environment factor, diver's level of comfort and the requirement that instrument should be easy to assemble, monitoring in real time and/or record diver's respiratory frequency and heart rate index when being implemented in diving operation, for monitoring with look back physiological status and the diagnoses and treatment of diver under water the time and provide support.
Description of drawings
The structural representation of Fig. 1 checkout gear one embodiment of the present invention.
The respiration detection pre-amplification circuit of Fig. 2 checkout gear one embodiment of the present invention.
The heart rate detection pre-amplification circuit of Fig. 3 checkout gear one embodiment of the present invention.
Low-pass filtering and the second amplifying circuit of Fig. 4 checkout gear one embodiment of the present invention.
The TF card of Fig. 5 checkout gear one embodiment of the present invention and the interface circuit of C8051F340.
Charge Management and the electrical measurement circuit of Fig. 6 checkout gear one embodiment of the present invention.
The voltage conversion circuit of Fig. 7 checkout gear one embodiment of the present invention.
The numeral of Fig. 8 checkout gear one embodiment of the present invention and analog circuit are isolated.
The perpetual calendar circuit of Fig. 9 checkout gear one embodiment of the present invention.
The microcontroller circuit of Figure 10 checkout gear one embodiment of the present invention.
The system flow chart of Figure 11 checkout gear one embodiment of the present invention.
The specific embodiment
Below in conjunction with specific embodiment, further set forth the present invention.These embodiment only are used to the present invention is described and are not used in and limit the scope of the invention.The experimental technique of unreceipted actual conditions in the following example is usually according to the normal condition or the condition of advising according to manufacturer.Unless otherwise defined, the same meaning that employed all specialties and scientific words and one skilled in the art are familiar with in the literary composition.In addition, any method similar or impartial to described content and material all can be applicable in the inventive method.The usefulness that preferable implementation method described in the literary composition and material only present a demonstration.
A kind of diver's air dive underwater breathing frequency and heart rate detection device, it is characterized in that it comprises respiration pickup, the respiration detection pre-amplification circuit, heart rate sensor, the heart rate detection pre-amplification circuit, low pass filter, two-stage amplifier, microprocessor, memorizer and power supply, described respiration pickup is by the respiration detection pre-amplification circuit, described heart rate sensor is connected with low pass filter respectively by the heart rate detection pre-amplification circuit, low pass filter, two-stage amplifier, microprocessor connects successively, memorizer connects microprocessor, power supply respectively with respiration pickup, the respiration detection circuit, heart rate sensor, the heart rate detection circuit, low pass filter, two-stage amplifier, microprocessor, memorizer connects power supply; Described checkout gear also contains the perpetual calendar chip, and the perpetual calendar chip is with I
2C communication protocol is connected with microprocessor, directly by lithium battery power supply; (as shown in Figure 1)
Described respiration pickup is an absolute pressure formula silicon pressure drag electric bridge sensor, and wherein preferred specification is the microminiature pressure transducer of 0～2MPa;
Described respiration detection circuit is fixed in the withstand voltage box, and described withstand voltage box is copper cylindrical shape, by M10 screw thread and waterproof rubber gasket, is installed on the low tension outlet of one-level decompressor.
Diving is after gas cylinder opens, and presses in when the diver is not air-breathing generally to remain on about 1MPa, and breathing can cause middle drops 0.2～0.3MPa.Consider that the pressure measurement scope will leave surplus, select the microminiature pressure transducer SP-8 of sekuo company for use, specification is 0～2MPa.This pick off has the precision height, and the characteristics that price is low generally are used for the doughnut internal gas pressure before this and measure.
Described heart rate sensor is an infrared sensor, and it comprises infrared heart rate measuring instrument and infrared probe, and infrared heart rate measuring instrument is bundled on diver's the forearm or shank, and infrared probe is entangled on finger or the toe, is connected on the heart rate measuring instrument by cable.Infrared sensor is selected the blood oxygen probe that generally is used on hospital's blood oxygen instrument for use.
Respiration detection pre-amplification circuit such as Fig. 2
SP-8 is an electric bridge in essence, and arm resistance changes with pressure change.The present invention adopts instrument amplifier AD620 to detect the differential signal of electric bridge output.Characteristics such as that AD620 has is low in energy consumption, precision height are fit to portable checkout equipment and use.The gain formula of AD620 is G=(49.4k Ω/R35)+1, only can set gain exactly with an outer meeting resistance.
The present invention adopts single power supply.Therefore, need to give the 5 foot REF of AD620 that 2.5V is provided reference voltage.The present invention adopts AD705 to constitute voltage follower and generates 2.5V a reference source.
The heart rate detection pre-amplification circuit
The heart rate detection pre-amplification circuit is seen Fig. 3.JK4 is the heart rate sensor interface.The 5V power supply is lighted infrared transmitting tube by R32.The C amplifier of four high guaily unit chip LM324 constitutes voltage follower, 8 feet output 2.5V a reference source.Because " empty breaking-empty short " characteristic of amplifier, 2, the 3 foot current potentials of LM324 also are 2.5V, infrared receiving tube is in the short circuit duty at this moment, and its short circuit current all flows through the feedback resistance R33 of 1M, so the electric current variation of infrared receiving tube nA level can cause the change in voltage of 1 foot mV level.It should be noted that, one, the shielding line of infrared probe must be linked to each other with circuit board simulation ground, can effectively reduce electromagnetic interference.Two, detect the photovoltage of infrared receiving tube usually in addition with the strong and weak detection mode that changes of infrared ray.Through test, the mode that detects short circuit current is sensitive, is easy to debugging.
Low-pass filtering and secondary amplify
For suppressing noise jamming, before carrying out the A/D sampling, also need signal is carried out filtering, this paper adopts the second order Butterworth LPF, and designing corner frequency is 7Hz.Also need carry out secondary after the filtering and amplify, to increase the signal amplitude of variation.Physical circuit such as Fig. 4.
TF card circuit
For making data collecting system can write down the measurand of long period, data storage should have bigger capacity and lower power consumption.Simultaneously for site environment under sample frequency be complementary, the read or write speed of data memorizer is also had corresponding requirements.The TF card (capacity 2G) that the present invention adopts KingSton company to produce, the TF jig has characteristics such as high power capacity, high-performance and safety height, and its running voltage is 2.7～3.6V.The present invention designs the TF card and is operated in the SPI pattern.The interface circuit of TF card and C8051F340 as shown in Figure 5.
Power supply and electrical measurement circuit
The present invention is of portable form, and therefore selects the single-unit lithium battery power supply for use, and capacity is 2400 MAHs, and voltage is 3.7V during full charge.In order to give lithium cell charging and accurately to measure the lithium battery dump energy, the present invention adopts DS2770 to design lithium cell charging and electrical measurement circuit, sees Fig. 6.When not working, instrument is by USB interface
Power supply, DS2770 gives lithium cell charging according to certain procedure.By measuring the precision resistance R12 both end voltage in 0.1 Europe, obtain battery current, and then try to achieve the lithium battery dump energy.DS2770 communicates by letter with C8051F340 by Integrated Service Digital Network news agreement, is read parameters such as current voltage of lithium battery and dump energy by C8051F340.
The present invention needs two-way voltage 3.3V and 5V, satisfying the job requirement of different chips, and requires supply current to be not less than 20mA.Lithium battery voltage is 3.7V, carries out DC-DC by LTC1754-3.3V and is converted to 3.3V, carries out DC-DC by LTC1754-5V and is converted to 5V, as Fig. 7.
In addition, the present invention divides digital circuit and analog circuit two parts.In order to reduce the interference of numerical portion, use strict power supply and the ground that isolates analog circuit and digital circuit of magnetic bead to analog circuit.See Fig. 8.
The perpetual calendar circuit
For the time that the energy record data begin to gather, the present invention has designed the perpetual calendar module.The perpetual calendar chip is PCF8563T, directly by lithium battery power supply, and without on and off switch, can dead electricity to guarantee chip, keep correct clock and calendar.The communication protocol of PCF8563T and C8051F340 is I2C.Circuit is seen Fig. 9.
Microprocessor
Processor of the present invention is a low-power consumption C8051F340 single-chip microcomputer, is widely used in the portable equipment.C8051F340 adopts the CIP-51 kernel, and speed reaches 25MIPS; A plurality of 16 general purpose timers and voltage comparator are arranged; Become multi-channel A C at chip integration, made the outer function device of sheet be able to maximum minimizing, shortened the system research and development cycle.Adopt built-in A/D module to carry out the sampling of respiratory pressure, heart rate.See Figure 10.
Design of System Software
The software design of hardware system mainly comprises modules such as single-chip microcomputer initialization, perpetual calendar chip initiation, TF card initialization, USB initialization, breathing or heart rate signal sampling, electric weight fetch program, USB communication program.System flow chart such as Figure 11.
It is 48Mhz that the single-chip microcomputer clock is set during the single-chip microcomputer initialization, and four frequency divisions are the system clock of 12Mhz as single-chip microcomputer.Intervalometer T2 is as the startup clock of A/D.Timing is 50ms, and 2 countings are total to 100ms and carry out an A/D conversion, and 20 conversions are carried out write operation one time to file.Native system adopts the file on the FAT32 form management TF card, so TF is stuck in and puts into that to need with card reader quick formatting on computers before the detector be the FAT32 form.
Scope of the present invention is not subjected to the restriction of described specific embodiments, and described embodiment also comprises the method and the component of functional equivalent only as the single example of illustrating various aspects of the present invention in the scope of the invention.In fact, except content as herein described, those skilled in the art can easily grasp multiple improvement of the present invention with reference to above description and accompanying drawing.Described improvement also falls within the scope of appended claims.Every piece of list of references mentioned above is listed this paper in as a reference all in full.
Claims (10)
1. the checkout gear of diver's air dive underwater breathing frequency and heart rate, it is characterized in that it comprises respiration pickup, the respiration detection pre-amplification circuit, heart rate sensor, the heart rate detection pre-amplification circuit, low pass filter, two-stage amplifier, microprocessor, memorizer and power supply, described respiration pickup is by the respiration detection pre-amplification circuit, described heart rate sensor is connected with low pass filter respectively by the heart rate detection pre-amplification circuit, low pass filter, two-stage amplifier, microprocessor connects successively, memorizer connects microprocessor, power supply respectively with respiration pickup, the respiration detection circuit, heart rate sensor, the heart rate detection circuit, low pass filter, two-stage amplifier, microprocessor, memorizer connects power supply.
2. checkout gear as claimed in claim 1 is characterized in that described respiration pickup is an absolute pressure formula silicon pressure drag electric bridge sensor.
3. checkout gear as claimed in claim 2 is characterized in that described absolute pressure formula silicon pressure drag electric bridge sensor is that specification is the microminiature pressure transducer of 0～2MPa.
4. checkout gear as claimed in claim 1 is characterized in that described respiration detection pre-amplification circuit is fixed in the withstand voltage box, and described withstand voltage box is installed on the low tension outlet of one-level decompressor by M10 screw thread and waterproof rubber gasket.
5. checkout gear as claimed in claim 1 is characterized in that described heart rate sensor is an infrared sensor, and it comprises infrared heart rate measuring instrument and infrared probe.
6. checkout gear as claimed in claim 1 is characterized in that described microprocessor is the C8051F340 single-chip microcomputer.
7. checkout gear as claimed in claim 1 is characterized in that described low pass filter is the second order Butterworth LPF, and its corner frequency is 7Hz.
8. checkout gear as claimed in claim 1 is characterized in that described power supply is a lithium battery.
9. checkout gear as claimed in claim 1 is characterized in that described memorizer is the TF card.
10. checkout gear as claimed in claim 1 is characterized in that described checkout gear also contains communication module, and it is connected with microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110159426 CN102210588A (en) | 2011-06-14 | 2011-06-14 | Method for detecting underwater respiratory rate and heart rate of diver in air diving |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110159426 CN102210588A (en) | 2011-06-14 | 2011-06-14 | Method for detecting underwater respiratory rate and heart rate of diver in air diving |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106175771A (en) * | 2016-08-25 | 2016-12-07 | 武汉中元通信股份有限公司 | Marine vital signs detecting module based on Bluetooth technology |
| CN112438715A (en) * | 2019-08-27 | 2021-03-05 | 华东师范大学 | Infrared heart rate measuring instrument |
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| JP2000244248A (en) * | 1999-02-24 | 2000-09-08 | Seiko Precision Inc | Signal amplifying device |
| CN1274270A (en) * | 1998-05-13 | 2000-11-22 | 佐治亚科技研究公司 | Fabric or garmet with integrated flexible information infrastructure |
| CN2798135Y (en) * | 2005-01-10 | 2006-07-19 | 捷飞科研有限公司 | Glasses for monitoring physiological system parameter |
| CN101316549A (en) * | 2005-09-26 | 2008-12-03 | 阿利兹菲西奥尼克斯有限公司 | Systems and methods for non-invasive detection and monitoring of cardiac and blood parameters |
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2011
- 2011-06-14 CN CN 201110159426 patent/CN102210588A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1274270A (en) * | 1998-05-13 | 2000-11-22 | 佐治亚科技研究公司 | Fabric or garmet with integrated flexible information infrastructure |
| JP2000244248A (en) * | 1999-02-24 | 2000-09-08 | Seiko Precision Inc | Signal amplifying device |
| CN2798135Y (en) * | 2005-01-10 | 2006-07-19 | 捷飞科研有限公司 | Glasses for monitoring physiological system parameter |
| CN101316549A (en) * | 2005-09-26 | 2008-12-03 | 阿利兹菲西奥尼克斯有限公司 | Systems and methods for non-invasive detection and monitoring of cardiac and blood parameters |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106175771A (en) * | 2016-08-25 | 2016-12-07 | 武汉中元通信股份有限公司 | Marine vital signs detecting module based on Bluetooth technology |
| CN112438715A (en) * | 2019-08-27 | 2021-03-05 | 华东师范大学 | Infrared heart rate measuring instrument |
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Application publication date: 20111012 |