CN109620177A - A kind of contactless Biont information detection alarm device and method - Google Patents
A kind of contactless Biont information detection alarm device and method Download PDFInfo
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Abstract
The invention belongs to extract and utilize field to Biont information is contactless, disclose a kind of contactless Biont information detection alarm device and method, the parallel detection module of each front-end information detection device setting two-way respectively detects the heartbeat of bioradar heartbeat, the output of respiratory waveform signal output end, respiratory waveform signal simultaneously, and the heartbeat and breathing level that two-way is detected respectively pass through single-chip microcontroller input interface and be sent into backend information processing and alarming management device；Backend information processing and alarming management device by SCM program to heartbeat and breathing level carry out Combined Treatment, according to processing result by single-chip microcontroller output interface driving alarm.The present invention is not influenced by use environment temperature and thermal objects, and since bioradar wave energy effectively penetrates a variety of media (a variety of non-metal articles such as rain, mist, clothing, paper, plastics), so the problem that detection alarm is failed caused by stopping because of each type objects and rate of false alarm is high is also minimized.
Description
Technical Field
The invention belongs to the field of non-contact extraction and utilization of biological information, and particularly relates to a non-contact biological information detection alarm device and method. The device extracts biological information of a living body in a non-contact mode, detects the extracted information and gives a corresponding alarm according to the detection result.
Background
Currently, the current state of the art commonly used in the industry is such that:
in the fields of security, disaster relief, clinical medical treatment and the like, the technologies of detecting biological information of organisms in a non-contact mode and giving corresponding alarms by using the detected biological information mainly depend on the body temperature of the organisms, the emitted sound and the motion development, and the corresponding detection technologies mainly comprise infrared ray induction detection, sound induction detection and microwave Doppler echo induction detection. Due to environmental restrictions, the detection method often causes erroneous judgment in the actual detection process.
Such as: when the temperature of the organism is close to the ambient temperature or the organism is a cold blood animal in a high-temperature environment, the infrared sensing detection mode fails; when the background noise is large or the organism does not make sound during action, the sound sensing detection mode also fails; when the organism is in a static state, the common microwave Doppler echo induction control mode is also in a failure state.
Therefore, it is of great significance to develop a detection alarm device which can overcome the technical defects.
At present, the research of non-contact organism radar has made great progress. Two kinds of biological information of the living organism can be successfully and simultaneously extracted under the non-contact condition through the biological radar: heartbeat and respiration. However, how to use the biological information such as heartbeat and respiration extracted by the non-contact biological radar to alarm and effectively apply the information to the fields such as security, disaster relief, clinical medicine and the like is still the subject of extensive attention and active research in the industry at present.
In summary, the problems of the prior art are as follows:
in the prior art, the alarm control mode is greatly limited under certain environments; moreover, respiration and heartbeat waveforms of the organism detected by the biological radar are not detected respectively, so that timely alarm output cannot be performed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a non-contact biological information detection alarm device and a non-contact biological information detection alarm method. The invention uses the biological detection radar to detect the biological information (breath, heartbeat, etc.), and provides a plurality of logic combination levels as alarm output according to the detection result, so that the user can select the corresponding level to alarm according to the self requirement.
The invention is realized in this way, a non-contact biological information detection alarm method, comprising:
firstly, detecting heartbeat and respiration waveforms output by a biological radar by using a plurality of front-end information detection devices, respectively converting the detected heartbeat and respiration waveforms into corresponding levels and sending the levels to a back-end information processing and alarm management device through an interface module;
and secondly, receiving and jointly processing the output heartbeat and respiration level signals through an input interface of the rear-end information processing and alarm management device, and respectively driving corresponding alarm output according to different processing results.
Further, the first step specifically includes:
a) setting threshold levels to filter clutter in heartbeat and respiration waveforms respectively;
b) amplifying the heartbeat waveform and the respiration waveform by using a multi-stage high-input impedance operational amplifier;
c) respectively inhibiting the interference in the heartbeat waveform and the respiration waveform by using a bidirectional amplitude discriminator, and extracting an effective level;
d) respectively adjusting the time ranges of an alarm delay time timer and a blocked alarm time timer corresponding to heartbeat and respiration, so as to adapt to the use requirements of different users;
e) and the acquired heartbeat level and the acquired respiration level are respectively converted into corresponding levels and are output to a rear-end information processing and alarm management device through an interface module.
Further, step a) comprises: the heartbeat and respiration information detected by a detection module of the front-end information detection device is converted into corresponding different logic combination levels to be sent to a subsequent output module; and clutter filtering is performed through the set threshold level.
Further, the second step specifically includes:
the back end information processing and alarm management device embedded in the single chip microcomputer respectively receives heartbeat and respiration levels detected and output by the plurality of front end information detection devices through the input interface, the single chip microcomputer program carries out combined processing on the two levels output by each front end information detection device, and corresponding alarm output is respectively driven according to different processing results; the method specifically comprises the following steps:
I) reading the input interface level data in a periodic timing scanning mode;
II), analyzing and judging the read heartbeat and respiratory level data respectively, and labeling and storing the heartbeat and respiratory level data read by different front-end information detection devices according to respective numbers and reading time;
III) the heartbeat and respiration level information read from the same front-end information detection device is processed jointly by a single chip microcomputer program;
IV) and driving alarm through the output interface of the single chip microcomputer according to the processing result.
Further, in the process of alarm output by the rear-end information processing and alarm management device, the heartbeat output is A, the respiration output is B, alarm output is carried out after combined processing, and the alarm output is output after negation, so that a final alarm level is obtained;
wherein,
the detection of A + B heartbeat and respiration is effective;
the heartbeat is not detected as valid;
no breath detected as valid;
the heartbeat and the breath are not detected to be effective at the same time;
outputting the alarm output after negating the alarm output, wherein the step of obtaining the final alarm level comprises the following steps:
neither heartbeat nor respiration was detected as valid;
a, detecting that the heartbeat is effective;
b, detecting the breath as effective;
the A and B heartbeats and the breath are detected simultaneously to be effective.
Further, the alarm driving mode of the output interface of the single chip microcomputer comprises driving an LED light alarm and a loudspeaker alarm, and uploading remote alarm is carried out through a network according to the needs of a user or collaborative alarm is carried out by calling other video monitoring security equipment;
the single chip microcomputer processes the front-end information simultaneously and is used for a user to perform alarm area defense by using the front-end information detection devices.
The embodiment of the invention provides a non-contact biological information detection alarm device, which comprises: the system comprises a plurality of front-end information detection devices and a rear-end information processing and alarm management device with an embedded single chip microcomputer as a core;
each front-end information detection device is provided with two parallel detection modules for simultaneously detecting heartbeat and respiration waveform signals output by the output ends of the biological radar heartbeat and respiration waveform signals respectively, and the two detected heartbeat and respiration levels are sent to a rear-end information processing and alarm management device through a single chip input interface;
the back end information processing and alarm management device carries out combined processing on the heartbeat and the respiration level by a single chip program and drives an alarm through a single chip output interface according to a processing result.
Further, the front-end information detection apparatus includes:
the threshold module is used for preprocessing input heartbeat/respiration signals such as impedance matching, direct-current component isolation, clutter filtering and the like, and then sending the preprocessed heartbeat/respiration signals to the next-stage amplification module for amplification processing;
the amplification module comprises a two-stage high impedance operational amplifier, and signals amplified by two stages are sent to a next stage amplitude discrimination processing module;
the amplitude discrimination processing module comprises two voltage comparators, suppresses noise interference in an input signal of the amplifier, detects effective trigger to form heartbeat/respiration level, and sends the level to a lower-level state control module if the level is greater than a control threshold set by a third voltage comparator;
the state control module carries the alarm delay time timer module and the blocking alarm time timer module to work simultaneously, the state control module controls whether to transmit the heartbeat/respiration alarm level to the rear-end information processing and alarm management device or not, the blocking alarm time timer is started to work when the alarm level delay time is over, and no new alarm level is generated during the working period of the blocking alarm time timer; the delay time of the two delay time timer modules and the blocking alarm time timer module is adjusted by changing corresponding resistance and capacitance parameters according to requirements;
the front-end radio frequency module of the continuous wave biological radar is of a direct frequency conversion structure and is connected with the threshold module; the antenna comprises a microstrip transceiving antenna, an oscillator, a mixer and a band-pass filter.
The front-end radio frequency module of the continuous wave biological radar is of a direct frequency conversion structure and is connected with the threshold module; the device comprises a microstrip transceiving antenna, an oscillator, a mixer and a band-pass filter;
the microstrip receiving and transmitting antenna is used for receiving and transmitting biological radar waves;
the mixer is used for preventing the signal from sampling aliasing;
the band pass filter is used to suppress dc offset and low frequency noise.
Further, the back-end information processing and alarm management device comprises:
the singlechip parallel input interface is connected with the output interfaces of the front-end information detection devices;
the singlechip is used for analyzing and judging the read heartbeat and respiration level data respectively, and marking and storing and recording the heartbeat and respiration level data read by different front-end devices according to the serial numbers of the front-end devices and the reading time respectively; the heartbeat and respiration level information read from the same front-end device is processed jointly by a single-chip microcomputer program, the stored data is connected to a server through an extended network, and different alarm logics are selected according to alarm requirements.
Further, the back-end information processing and alarm management device further comprises:
the alarm device is used for alarming when the alarm level is selected to be 1 when the alarm is on a long distance;
alarm switch device for target close range personWhen the body target is monitored, the alarm level outputs and selects A.B to be 1, and then the alarm is given; the device is also used for reverse alarm, and alarms when the monitored target leaves the monitoring range, and the heartbeat and the breath are selected not to be detectedOr the heartbeat and the respiration are not detected simultaneouslyAlarming;
the output interface of the singlechip is connected with the LED light driver and the loudspeaker driver for alarming and prompting.
Further, when the single-chip program performs combined processing on heartbeat and respiration level information read from the same front-end device, if the heartbeat output is a and the respiration output is B, the alarm output truth table after the combined processing is as follows (logic "0" is invalid and logic "1" is valid):
in summary, the advantages and positive effects of the invention are:
the detection alarm device of the invention adopts the processing mode of carrying out shunt detection on the heartbeat and respiration waveforms output by the biological radar and outputting and driving the alarm after the combined processing of the singlechip program, fully utilizes the characteristics that two biological information of the heartbeat and the respiration appear along with each other and have larger frequency difference, and reduces misjudgment caused by environmental interference during actual work by the shunt detection, mutual evidence and combined use of the two biological information, thereby improving the alarm accuracy. For example, a human may have a heartbeat of about 60 to 80 beats per minute and a breath of about 18 to 20 beats per minute. Assuming that a human heartbeat is calculated at 80 beats per minute, its frequency is about 1.34 Hz; the frequency of the respiration is about 0.3Hz when the respiration is calculated at 18 times per minute, which shows that the difference between the human heartbeat frequency and the respiration frequency is about 4: 1. When the heartbeat and the respiration wave are detected by the heartbeat and the respiration detection modules respectively, the possibility that the detected target is a human body is higher than that of a single-path detection mode. Conversely, when only one waveform is detected, the detected waveform is more likely to be from interference than when both waveforms are detected simultaneously. In addition, the alarm level can be output in various combinational logics, and various alarm modes can be provided, so that the application range of the alarm device is expanded. Such as: when the alarm device is mainly used for remote warning, the alarm sensitivity is required to be high, the alarm is given when the alarm level output can be selected to be A + B as 1, and the alarm can be given as long as any waveform of heartbeat and respiration is detected; on the contrary, when the alarm device is mainly used for monitoring a human target at a close distance, the accuracy is high, the alarm level can be output when A and B are selected to be 1, and the alarm can be given only when the heartbeat waveform and the respiration waveform are detected simultaneously, so that the alarm accuracy can be ensured to the maximum extent. In addition, when the alarm device is mainly used for reverse alarm, namely alarm when the monitored target leaves the monitoring range, the alarm level of negative logic output can be selected, such as the heart beat and the breath are not detectedNamely, when A + B is 0, the alarm is given.
Simultaneously still have the advantage have:
the device utilizes the biological information detection mode to control the alarm, and effectively overcomes the defects of three non-contact induction detection control alarm modes which are commonly adopted at present. The device irradiates an organism by using radar waves emitted by a Continuous wave radar (Continuous-wave Bio-radar), receives and detects echoes reflected by the organism, judges whether the organism exists in an effective detection range of the radar according to the echoes, and controls corresponding switch action according to needs. The radar has good distance resolution and penetration capability, can detect the micro-motion information on the surface of the organism caused by vital signs such as respiration and heartbeat of the organism in a static state in a non-contact mode, and compared with three control modes of sound control, common microwave Doppler echo control and infrared induction control which are conventionally adopted, the mode of utilizing the biological radar to carry out alarm control by detecting the vital signs of the organism does not need a monitored object to make sound and move, is not influenced by the temperature of a use environment and a heating object, and because the biological radar can effectively penetrate various media (rain, fog, clothes, paper, plastics and other various non-metal objects), the problems of detection alarm failure and high false alarm rate caused by the blockage of various objects are also reduced.
Drawings
Fig. 1 is a schematic diagram of a non-contact biological information detection alarm method according to an embodiment of the present invention.
Fig. 2 is a schematic view of a non-contact biological information detection alarm device according to an embodiment of the present invention.
Fig. 3 is a diagram (a) of a heartbeat raw waveform and a respiration raw waveform (b) sent to a front-end detection module according to an embodiment of the present invention.
Fig. 4 is a photograph showing the superposition of the original heartbeat waveform and the original respiration waveform provided by the embodiment of the present invention, and it can be seen that there is a large difference in frequency between the two waveforms.
Fig. 5 is a structural diagram of a non-contact biological information detection alarm device according to an embodiment of the present invention.
Fig. 6 is a flowchart of the front-end information detection apparatus according to an embodiment of the present invention; (only 1 of them front).
Fig. 7 is a single chip microcomputer program diagram of a back-end information processing and alarm management device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the prior art, the alarm control mode is greatly limited under certain environments; moreover, respiration and heartbeat waveforms of the organism detected by the biological radar are not detected respectively, so that timely alarm output cannot be performed.
In view of the above, the present invention will be described in detail with reference to specific embodiments.
The non-contact biological information detection alarm device provided by the invention consists of a front-end information detection device, a rear-end information processing and alarm management device and the like. The front-end information detection device simultaneously detects heartbeat and respiration waveforms output by the biological radar, respectively converts the detected heartbeat and respiration waveforms into corresponding levels, and outputs the levels to the rear-end information processing and alarm management device through the interface module for information processing. The back end information processing and alarm management device is constructed by taking a single chip microcomputer as a core, receives heartbeat and respiration levels output by a plurality of (4 in an example) front end detection devices through corresponding interface modules respectively, performs corresponding combined processing on the two levels, and provides different alarm outputs according to processing results. The invention provides a plurality of different alarm processing modes after the heartbeat and respiration waveforms are detected in a shunt way and are jointly processed by a singlechip program, fully utilizes the characteristics that two biological information of the heartbeat and the respiration appear together and have larger frequency difference, and reduces misjudgment caused by environmental interference during actual work by using the shunt detection, mutual evidence and joint use of the heartbeat and the respiration, thereby improving the alarm accuracy.
The invention mainly detects biological information such as heartbeat, respiration and the like of a living body by taking a living body target as a main detection object. Other living bodies whose biological information such as heartbeat and respiration is close to the living body can also be detected by using the device.
In an embodiment of the present invention, as shown in fig. 1, a non-contact biological information detection alarm method provided in an embodiment of the present invention includes:
s101, detecting heartbeat and respiration waveforms output by the biological radar by using a plurality of front-end information detection devices, respectively converting the detected heartbeat and respiration waveforms into corresponding levels and sending the levels to a back-end information processing and alarm management device through an interface module;
and S102, receiving and jointly processing the output heartbeat and respiration level signals through an input interface of the rear-end information processing and alarm management device, and respectively driving corresponding alarm output according to different processing results.
As a preferred embodiment of the present invention, step S101 specifically includes:
a) setting threshold levels to filter clutter in heartbeat and respiration waveforms respectively;
b) amplifying the heartbeat waveform and the respiration waveform by using a multi-stage high-input impedance operational amplifier;
c) respectively inhibiting the interference in the heartbeat waveform and the respiration waveform by using a bidirectional amplitude discriminator, and extracting an effective level;
d) respectively adjusting the time ranges of an alarm delay time timer and a blocked alarm time timer corresponding to heartbeat and respiration, so as to adapt to the use requirements of different users;
e) and the acquired heartbeat level and the acquired respiration level are respectively converted into corresponding levels and are output to a rear-end information processing and alarm management device through an interface module.
Step a), comprising: the heartbeat and respiration information detected by a detection module of the front-end information detection device is converted into corresponding different logic combination levels to be sent to a subsequent output module; and clutter filtering is performed through the set threshold level.
As a preferred embodiment of the present invention, step S102 specifically includes:
the back end information processing and alarm management device embedded in the single chip microcomputer respectively receives heartbeat and respiration levels detected and output by the plurality of front end information detection devices through the input interface, the single chip microcomputer program carries out combined processing on the two levels output by each front end information detection device, and corresponding alarm output is respectively driven according to different processing results; the method specifically comprises the following steps:
I) reading the input interface level data in a periodic timing scanning mode;
II), analyzing and judging the read heartbeat and respiratory level data respectively, and labeling and storing the heartbeat and respiratory level data read by different front-end information detection devices according to respective numbers and reading time;
III) the heartbeat and respiration level information read from the same front-end information detection device is processed jointly by a single chip microcomputer program;
IV) and driving alarm through the output interface of the single chip microcomputer according to the processing result.
As a preferred embodiment of the present invention, in the alarm output of the back-end information processing and alarm management device, the heartbeat output is a, the respiration output is B, the alarm output is performed after the combined processing, and the alarm output is inverted and then output, so as to obtain a final alarm level;
wherein,
the detection of A + B heartbeat and respiration is effective;
the heartbeat is not detected as valid;
no breath detected as valid;
the heartbeat and the breath are not detected to be effective at the same time;
outputting the alarm output after negating the alarm output, wherein the step of obtaining the final alarm level comprises the following steps:
neither heartbeat nor respiration was detected as valid;
a, detecting that the heartbeat is effective;
b, detecting the breath as effective;
the A and B heartbeats and the breath are detected simultaneously to be effective.
As a preferred embodiment of the invention, the alarm driving mode of the output interface of the singlechip comprises driving LED light alarm and driving a loudspeaker to alarm, and uploading remote alarm is carried out through a network according to the needs of users, or other security and protection equipment of video monitoring is called to carry out cooperative alarm;
as a preferred embodiment of the invention, the single chip microcomputer processes a plurality of pieces of front-end information at the same time, and is used for a user to perform alarm area defense by utilizing a plurality of front-end information detection devices.
The application of the present invention will be further described with reference to the non-contact type organism information detection alarm device and the operation principle.
The non-contact biological information detection alarm device provided by the embodiment of the invention is divided into a detection part (a front-end information detection device) and a control part (an information processing and alarm management device taking an embedded single chip microcomputer as a core). The working principle of the detection part is as follows: because the body surface micro-motion information of the organism can reflect certain physiological activities of the organism, for example, biological information such as respiration, heartbeat and the like of the organism can be obtained by detecting the vibration of a chest wall, continuous electromagnetic waves are transmitted to an organism target through a continuous wave biological radar by utilizing the Doppler effect of the electromagnetic waves, echoes reflected by the body surface of the organism are received, and the micro-motion information of the body surface of the organism can be obtained by extracting and calculating through the change of the frequency or the phase of a received echo signal, so that certain states of the organism can be mastered. Taking a human as an example, the amplitude of the mechanical vibration of the body surface caused by normal heart beat movement of a human body is about 0.6 mm; the amplitude generated by respiration is about 4mm to 12 mm. When the biological radar is used for detecting the motion of the chest wall of a human body, the chest wall displacement can cause corresponding phase shift, and although the vibration amplitude of the chest wall is small, the phase shift reflected on a radar baseband can still be distinguished when the carrier frequency is high enough. When the radar wave frequency is higher, the reflection on the human skin and air interface is stronger, but the clutter reflection on clothes, bedding and other obstacles is increased, and in order to obtain higher detection precision and reduce the influence of the clutter reflection as much as possible, the carrier frequency of the K frequency band 24GHz is selected for the biological radar. The front-end radio frequency module of the continuous wave biological radar used by the device is a direct frequency conversion structure and comprises modules such as a micro-strip receiving and transmitting antenna, an oscillator, a frequency mixer, a band-pass filter, signal processing, signal output and the like. As shown in fig. 2.
Suppose human target is at distance transmitting-receiving antenna d0When the heartbeat and the lung respiration of the biological radar generate periodic motion x (t), when the transmission signal is transmitted to extract the heart and lung activity information of a target from a receiving signal of the biological radar, the frequency of a useful signal is between (0.2-10) Hz and the amplitude is weak, a continuous wave radar front-end module needs a high enough signal-to-noise ratio, and carries out direct current offset correction, signal amplification and analog band-pass filtering on the down-converted receiving signal, and then various physiological parameter detection and extraction algorithms are applied to obtain the required information to be sent to subsequent parts for processing.
In the embodiment of the present invention, the detecting section (front-end information detecting means) includes:
the threshold module is used for preprocessing input heartbeat/respiration signals such as impedance matching, direct-current component isolation, clutter filtering and the like, and then sending the preprocessed heartbeat/respiration signals to the next-stage amplification module for amplification processing;
the amplification module comprises a two-stage high impedance operational amplifier, and signals amplified by two stages are sent to a next stage amplitude discrimination processing module;
the amplitude discrimination processing module comprises two voltage comparators, suppresses noise interference in an input signal of the amplifier, detects effective trigger to form heartbeat/respiration level, and sends the level to a lower-level state control module if the level is greater than a control threshold set by a third voltage comparator;
the state control module carries the alarm delay time timer module and the blocking alarm time timer module to work simultaneously, the state control module controls whether to transmit the heartbeat/respiration alarm level to the rear-end information processing and alarm management device or not, the blocking alarm time timer is started to work when the alarm level delay time is over, and no new alarm level is generated during the working period of the blocking alarm time timer; the delay time of the two delay time timer modules and the blocking alarm time timer module is adjusted by changing corresponding resistance and capacitance parameters according to requirements;
the front-end radio frequency module of the continuous wave biological radar is of a direct frequency conversion structure and is connected with the threshold module; the antenna comprises a microstrip transceiving antenna, an oscillator, a mixer and a band-pass filter.
As the preferred embodiment of the invention, the detection part further comprises a continuous wave biological radar front end radio frequency module which is a direct frequency conversion structure and is connected with the threshold module; the device comprises a microstrip transceiving antenna, an oscillator, a mixer and a band-pass filter;
the microstrip receiving and transmitting antenna is used for receiving and transmitting biological radar waves;
the mixer is used for preventing the signal from sampling aliasing;
the band pass filter is used to suppress dc offset and low frequency noise.
In the embodiment of the invention, the radar wave transmitted by a detection part of front-end modules of the device is a constant-amplitude sine wave, and the working frequency band of a radar carrier wave is 24 GHz; the antenna used for receiving and transmitting is a microstrip antenna; the signal processing module mainly realizes the amplification and filtering and level shifting of signals; the filtering module adopts bandwidth filtering, the lower limit cut-off frequency of the filtering module is 0.1Hz, the filtering module is mainly used for inhibiting direct current offset and low-frequency noise, and the upper limit cut-off frequency is 100Hz, so that sampling aliasing of signals is mainly prevented. The function of the radar emission is:
T(t)＝ATcos(2πf0t)
in the above formula, ATTo amplitude of the transmitted wave, f0Is the radar carrier frequency.
The human target will produce a certain amplitude of periodic motion due to heartbeat and respiration, and the motion can be described by a function, which is set as x (t). When the carrier wave emitted by the bio-radar is reflected by the surface of the human body, the periodic motion x (t) caused by the heartbeat and respiration causes the doppler effect of the reflected wave. The reflected wave function at this time is as follows:
R(t)＝ARcos(2π(f0+fd)t)
in the above formula, ARIs the amplitude of the reflected wave, f0For radar carrier frequency, fdThe doppler shift in the reflected wave due to the x (t) change.
The doppler shift expression is as follows:
due to the fact thatThe doppler shift expression can also be written as:
by processing the radar reflected wave, the Doppler frequency shift f is extracteddThe function x (t) of the periodic motion of the heart and the lung of the human body target can be obtained.
The device adopts coherent demodulation processing mode, and uses transmitting signal T (t) as ATcos(2πf0t) is a reference signal sent to the multiplier and a received signal R (t) is ARcos(2π(f0+fd) t) are multiplied by a trigonometric sum and difference formula cosx cosy 1/2[ cos (x + y) + cos (x-y)]The following can be obtained:
cos(2πf0t)*cos(2π(f0+fd)t)
＝1/2[cos((2πf0+2πf0+2πfd)t)+cos((2πf0-2πf0-2πfd)t)]
＝1/2[cos((4πf0+2πfd)t)+cos((-2πfdt)]
the Doppler frequency shift f is obtained by filtering the medium-high frequency component in the upper formula by a low-pass filterdFurther, the periodic motion function x (t) of the human target due to heartbeat and respiration can be obtained.
In the embodiment of the invention, the output of the detection module of the device is divided into a heartbeat output and a respiration output. Generally, the heart rate and the respiratory rate of the organism are different. For example, a human may have a heartbeat of about 60 to 80 beats per minute and a breath of about 18 to 20 beats per minute. Assuming that the heartbeat of a human body is calculated as 80 beats per minute, the frequency is about 1.34 Hz; the frequency of breaths is about 0.3Hz, calculated at 18 breaths per minute. The heart rate is greatly different from the breathing rate. The detection module of the device respectively obtains the heartbeat and the respiration information of the detection target by using a physiological parameter detection and extraction algorithm, sends the heartbeat and the respiration information to the subsequent information processing module for processing, and sends the heartbeat and the respiration information to the corresponding output end for output.
The reason why the heartbeat and the respiration information are respectively processed and output is that for a living body, the heartbeat and the respiration always appear along with each other, but the frequency difference between the heartbeat and the respiration always appears, so when the heartbeat and the respiration information are simultaneously detected, the reliability of the heartbeat and the respiration information of the detected living body can be considered to be higher than that when only single heartbeat information or respiration information is detected, and thus, the misjudgment caused by the environmental interference during the actual detection of the device can be reduced and the accuracy is improved by the mode of respectively detecting, mutually assisting and jointly using the heartbeat and the respiration information.
In an embodiment of the present invention, a non-contact biological information detection alarm method provided in an embodiment of the present invention includes: the heartbeat and respiration information detected by the detection module is converted into corresponding different logic combination levels to be sent to a subsequent output module. Besides filtering clutter by the threshold level, the heartbeat and respiration information is amplified by the multi-level high-input impedance operational amplifier, interference is suppressed by the bidirectional amplitude discriminator, and the time ranges of the alarm delay time timer and the alarm blocking time timer can be adjusted according to needs, so that the alarm accuracy is improved and the use requirements of different users are met.
In order to facilitate the expanded application of users, the output end of the device provides various combinational logic alarm outputs in a standard TTL level mode. If the heartbeat output is A and the respiration output is B, the combined logic alarm output is as follows:
1) and a + B is effective for heartbeat and respiration detection. The effect is only detected when there is a heartbeat or a breath (the effect is high level, the same below).
2)、That is, the heartbeat is not detected, which is effective.
3)、I.e. the breath is not detected, is valid.
4)、I.e. heartbeat and respirationIt is effective if not detected at the same time.
In actual use, the user can also carry out extended output on the above combinational logic. If the four logic levels are inverted and then output, a new group of alarm levels is obtained:
1)、i.e. neither heartbeat nor respiration is detected as being effective.
2) And A is effective when the heartbeat is detected.
3) B, breath detection is effective.
4) It is effective to detect A and B, i.e., heartbeat and respiration simultaneously.
The application of the invention is further described below with reference to specific examples.
Examples
The non-contact biological information detection alarm device provided by the invention consists of 4 front-end information detection devices and 1 information processing and alarm management device with an embedded singlechip as a core at the rear end.
In the embodiment of the invention, each front-end information detection device is provided with two parallel detection modules for simultaneously detecting heartbeat and respiration waveform signals output by the output ends of the heartbeat and respiration waveform signals of the biological radar, the two detected heartbeat and respiration levels are sent to the rear-end information processing and alarm management device through the input interface of the single chip microcomputer, the heartbeat and respiration levels are processed jointly by the program of the single chip microcomputer, and the alarm is driven through the output interface of the single chip microcomputer according to the processing result.
In the embodiment of the invention, the front-end information detection device has the following working principle:
firstly, preprocessing input heartbeat/respiration signals such as impedance matching, direct-current component isolation, clutter filtering and the like through a threshold module, and then sending the preprocessed heartbeat/respiration signals to a lower-level amplification module for amplification processing;
the amplification module consists of two stages of high impedance operational amplifiers, and signals amplified by the two stages of the amplification module are sent to the next stage of amplitude discrimination processing module;
the two-way amplitude discriminator composed of two voltage comparators in the amplitude discrimination processing module suppresses noise interference (the part set to be less than +/-1V in the example) in the input signal of the amplifier, simultaneously detects effective trigger forming heartbeat/respiration level, and sends the level to a lower-level state control module if the level is greater than a control threshold set by a third voltage comparator (the control threshold of the third voltage comparator can be set according to the use environment and application, such as full-time use or night-time use only, and the like).
The state control module works together with the alarm delay time timer module and the blocking alarm time timer module, whether the state control module transmits heartbeat/respiration alarm level to the rear-end information processing and alarm management device is controlled by the state control module, the duration of the alarm level is determined by the alarm delay time timer, when the alarm level delay time is over, the state control module starts the blocking alarm time timer to work, no new alarm level is generated during the working period of the blocking alarm time timer, therefore, the interference on the front end is avoided when the alarm level of the rear-end alarm module is switched, and the delay time of the two timers can be adjusted by changing corresponding resistance and capacitance parameters according to requirements.
In the embodiment of the invention, the principle of the back-end information processing and alarm management device is as follows:
the 4 output interfaces of the front-end information detection device respectively output heartbeat and respiration alarm levels, each front-end device is provided with two output lines, and the 4 front ends of the front-end information detection device are connected with 8-bit parallel input interfaces of the rear-end singlechip, and are periodically scanned and read by programs of the rear-end singlechip at regular time.
The single chip program respectively analyzes and judges the read heartbeat and respiration level data, and respectively marks and stores and records the heartbeat and respiration level data read by different front-end devices according to the serial numbers and the reading time of the front-end devices.
The heartbeat and respiration level information read from the same front-end device is processed jointly by a single chip microcomputer program. During treatment, if the heartbeat output is A and the respiration output is B, the alarm output truth table after combined treatment is as follows (logic '0' is invalid, logic '1' is valid):
as a preferred embodiment of the present invention, the single chip microcomputer program supports a user to select different alarm logics according to alarm requirements, and specifically includes:
i) when the alarm device is mainly used for remote warning, the alarm sensitivity is high, the alarm level can be selected to alarm when A + B is 1, and at the moment, the alarm can be given as long as any one of the heartbeat level and the respiration level is 1;
ii) when the alarm switch device is mainly used for monitoring a target of a human body at a close distance, the accuracy is high, the alarm level can be output to alarm when A.B is 1, and the alarm can be given only when the heartbeat level and the respiration level are 1 simultaneously;
iii) when the alarm switch device is mainly used for reverse alarm, namely alarm when the monitored target leaves the monitoring range, the heart beat and the breath can be selected not to be detectedOr the heartbeat and the respiration are not detected simultaneouslyAlarm (the sensitivity or accuracy of the two is different).
The alarm driving mode of the output interface of the single chip microcomputer comprises driving an LED light alarm and driving a loudspeaker to alarm, and the single chip microcomputer output interface is selected by a user according to needs.
As a preferred embodiment of the present invention, the present embodiment adopts a framework of 4 front-end information detection devices and 1 back-end information processing and alarm management device, and the back-end single chip microcomputer can simultaneously process the information of 4 front ends, so that a user can conveniently use the 4 front ends to perform alarm area defense.
As a preferred embodiment of the invention, the stored data of the singlechip can be connected to a server through an extended network to realize uploading type remote alarm.
The present invention will be further described with reference to effects.
This device through in-service use, its advantage has: because the heartbeat and respiration two levels are used for combined detection and alarm, the sensitivity and the accuracy of the alarm are higher than those of a device which only depends on single heartbeat or respiration for detection and alarm; due to the adoption of a plurality of (4) front-end information detection and back-end information processing frameworks, a user can conveniently use different front ends to perform alarm area defense; because of providing the alarm output modes of sound, light and the like, the flexibility and the convenience of the use are fully embodied.
In the embodiment of the present invention, fig. 3 is a diagram (a) of a heartbeat original waveform and a respiration original waveform (b) sent to a front-end detection module according to the embodiment of the present invention.
Fig. 4 is a photograph showing the superposition of the original heartbeat waveform and the original respiration waveform provided by the embodiment of the present invention, and it can be seen that there is a large difference in frequency between the two waveforms.
Fig. 5 shows a structure of a noncontact biological information detection alarm device according to an embodiment of the present invention.
Fig. 6 is a workflow of the front-end information detection apparatus according to the embodiment of the present invention, which is only 1 front end).
Fig. 7 is a single chip microcomputer program of the back-end information processing and alarm management device provided by the embodiment of the invention.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When used in whole or in part, can be implemented in a computer program product that includes one or more computer instructions. When loaded or executed on a computer, cause the flow or functions according to embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL), or wireless (e.g., infrared, wireless, microwave, etc.)). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A non-contact type biological information detection alarm method is characterized by comprising the following steps:
firstly, detecting heartbeat and respiration waveforms output by a biological radar by a plurality of front-end information detection devices, respectively converting the detected heartbeat and respiration waveforms into corresponding levels and sending the levels to a back-end information processing and alarm management device through an interface module;
and secondly, receiving the output heartbeat and respiration level signals, performing combined processing, and respectively driving corresponding alarm output according to different processing results.
2. The non-contact type organism information detecting alarm method according to claim 1,
the first step specifically comprises:
a) setting threshold levels to filter clutter in heartbeat and respiration waveforms respectively;
b) amplifying the heartbeat waveform and the respiration waveform by using a multi-stage high-input impedance operational amplifier;
c) respectively inhibiting the interference in the heartbeat waveform and the respiration waveform by using a bidirectional amplitude discriminator, and extracting an effective level;
d) respectively adjusting the time ranges of an alarm delay time timer and a blocked alarm time timer corresponding to heartbeat and respiration, so as to adapt to the use requirements of different users;
e) and the acquired heartbeat level and the acquired respiration level are respectively converted into corresponding levels and are output to a rear-end information processing and alarm management device through an interface module.
3. The non-contact type organism information detecting alarm method according to claim 2,
step a), comprising: the heartbeat and respiration information detected by a detection module of the front-end information detection device is converted into corresponding different logic combination levels to be sent to a subsequent output module; and clutter filtering is performed through the set threshold level.
4. The non-contact type organism information detecting alarm method according to claim 2,
the second step specifically comprises:
the back end information processing and alarm management device embedded in the single chip microcomputer respectively receives heartbeat and respiration levels detected and output by the plurality of front end information detection devices through the input interface, the single chip microcomputer program carries out combined processing on the two levels output by each front end information detection device, and corresponding alarm output is respectively driven according to different processing results; the method specifically comprises the following steps:
I) reading the input interface level data in a periodic timing scanning mode;
II), analyzing and judging the read heartbeat and respiratory level data respectively, and labeling and storing the heartbeat and respiratory level data read by different front-end information detection devices according to respective numbers and reading time;
III) the heartbeat and respiration level information read from the same front-end information detection device is processed jointly by a single chip microcomputer program;
IV) and driving alarm through the output interface of the single chip microcomputer according to the processing result.
5. The non-contact type organism information detecting alarm method according to claim 4,
in the process of alarm output by the rear-end information processing and alarm management device, the heartbeat output is A, the respiration output is B, alarm output is carried out after combined processing, and the alarm output is output after negation, so that the final alarm level is obtained;
wherein,
the detection of A + B heartbeat and respiration is effective;
the heartbeat is not detected as valid;
no breath detected as valid;
the heartbeat and the breath are not detected to be effective at the same time;
outputting the alarm output after negating the alarm output, wherein the step of obtaining the final alarm level comprises the following steps:
neither heartbeat nor respiration was detected as valid;
a, detecting that the heartbeat is effective;
b, detecting the breath as effective;
the A and B heartbeats and the breath are detected simultaneously to be effective.
6. The non-contact type organism information detecting alarm method according to claim 4,
the alarm driving mode of the output interface of the singlechip comprises driving LED light alarm and driving a loudspeaker to alarm, and uploading remote alarm is carried out through a network according to the needs of a user or collaborative alarm is carried out by calling other security equipment for video monitoring;
the single chip microcomputer processes the front-end information simultaneously and is used for a user to perform alarm area defense by using the front-end information detection devices.
7. A non-contact biological information detection alarm device according to claim 1, wherein the non-contact biological information detection alarm device comprises: the system comprises a plurality of front-end information detection devices and a rear-end information processing and alarm management device with an embedded single chip microcomputer as a core;
each front-end information detection device is provided with two parallel detection modules for simultaneously detecting heartbeat and respiration waveform signals output by the output ends of the biological radar heartbeat and respiration waveform signals respectively, and the two detected heartbeat and respiration levels are sent to a rear-end information processing and alarm management device through a single chip input interface;
the back end information processing and alarm management device carries out combined processing on the heartbeat and the respiration level by a single chip program and drives an alarm through a single chip output interface according to a processing result.
8. The non-contact type organism information detecting alarm apparatus according to claim 7,
the front-end information detection device includes:
the threshold module is used for preprocessing input heartbeat/respiration signals such as impedance matching, direct-current component isolation, clutter filtering and the like, and then sending the preprocessed heartbeat/respiration signals to the next-stage amplification module for amplification processing;
the amplification module comprises a two-stage high impedance operational amplifier, and signals amplified by two stages are sent to a next stage amplitude discrimination processing module;
the amplitude discrimination processing module comprises two voltage comparators, suppresses noise interference in an input signal of the amplifier, detects effective trigger to form heartbeat/respiration level, and sends the level to a lower-level state control module if the level is greater than a control threshold set by a third voltage comparator;
the state control module carries the alarm delay time timer module and the blocking alarm time timer module to work simultaneously, the state control module controls whether to transmit the heartbeat/respiration alarm level to the rear-end information processing and alarm management device or not, the blocking alarm time timer is started to work when the alarm level delay time is over, and no new alarm level is generated during the working period of the blocking alarm time timer; the delay time of the two delay time timer modules and the blocking alarm time timer module is adjusted by changing corresponding resistance and capacitance parameters according to requirements;
the front-end radio frequency module of the continuous wave biological radar is of a direct frequency conversion structure and is connected with the threshold module; the device comprises a microstrip transceiving antenna, an oscillator, a mixer and a band-pass filter;
the microstrip receiving and transmitting antenna is used for receiving and transmitting biological radar waves;
the mixer is used for preventing the signal from sampling aliasing;
the band pass filter is used to suppress dc offset and low frequency noise.
9. The non-contact biological information detection alarm device according to claim 7, wherein the backend information processing and alarm management device includes:
the singlechip parallel input interface is connected with the output interfaces of the front-end information detection devices;
the singlechip is used for analyzing and judging the read heartbeat and respiration level data respectively, and marking and storing and recording the heartbeat and respiration level data read by different front-end devices according to the serial numbers of the front-end devices and the reading time respectively; the heartbeat and respiration level information read from the same front-end device is processed jointly by a single-chip microcomputer program, the stored data is connected to a server through an extended network, and different alarm logics are selected according to alarm requirements.
10. The non-contact biological information detection alarm device according to claim 7, wherein the back-end information processing and alarm management device further comprises:
the alarm device is used for alarming when the alarm level is selected to be 1 when the alarm is on a long distance;
the alarm switch device is used for alarming when the alarm level output selects A.B to be 1 when the target is monitored by a human body target at a close distance; the device is also used for reverse alarm, and alarms when the monitored target leaves the monitoring range, and the heartbeat and the breath are selected not to be detectedOr the heartbeat and the respiration are not detected simultaneouslyAlarming;
the output interface of the singlechip is connected with the LED light driver and the loudspeaker driver for alarming and prompting.
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| CN112346053A (en) * | 2020-11-04 | 2021-02-09 | 西安宝瑞达电子科技有限责任公司 | Bioradar, sensor controller, control method, electrical equipment and storage medium |
| CN112364808A (en) * | 2020-11-24 | 2021-02-12 | 哈尔滨工业大学 | Living body identity authentication method based on FMCW radar and face tracking identification |
| CN112914554A (en) * | 2021-03-24 | 2021-06-08 | 湖南万脉医疗科技有限公司 | Noninvasive breathing frequency monitoring method and system for breathing machine |
| TWI814576B (en) * | 2022-09-08 | 2023-09-01 | 譯麓有限公司 | Non-contact vital sign detection system with privacy protection |
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