CN115444407A - Physiological information monitoring device based on optical fiber sound wave sensing - Google Patents
Physiological information monitoring device based on optical fiber sound wave sensing Download PDFInfo
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Abstract
The invention discloses a physiological information monitoring device based on optical fiber sound wave sensing, which comprises: a light source for generating a light signal; the optical path circulator is used for receiving an optical signal from the light source through the first port and sending the optical signal to the optical acoustic wave sensing probe through the second port; the air cushion is used for converting a weak vibration signal of a human body into an acoustic signal and transmitting the acoustic signal to the optical acoustic sensing probe; the optical sound wave sensing probe is connected with the air cushion and used for sensing sound wave signals in the air cushion and modulating the spectrum of the output light signals by using the sound wave signals; the optical path circulator is also used for receiving the modulated optical signal through the second port and sending the modulated optical signal to the demodulator through the third port; the demodulator is used for demodulating the spectral information of the input optical signal and converting the spectral information into an electrical signal so as to acquire a human body weak vibration signal and extract physiological information from the human body weak vibration signal. The physiological information monitoring device provided by the invention reduces the pressure loss probability of the optical fiber sensing element, and the sensing mat can be bent.
Description
Technical Field
The invention belongs to the technical field of physiological information monitoring, and particularly relates to a physiological information monitoring device based on optical fiber sound wave sensing.
Background
With the development of the internet of things (IoT) technology in the medical industry, the physiological information monitoring technology has gone beyond the scope of medical practice and has entered into multiple fields of our daily lives. Currently, the technologies for monitoring physiological information mainly include photoplethysmography (PPG), electrocardiogram (ECG), ballistocardiogram (BCG), and the like. Among them, the monitoring of PPG and ECG signals generally requires direct contact with the skin, with poor user compliance. BCG signals are weak changes of external pressure on the surface of a human body caused by heart pulsation and arterial blood flow, are weak vibrations of the human body caused by mechanical activity of the heart, and most of the monitoring of BCG signals do not need to be in direct contact with the skin, so that the non-skin contact type physiological information monitoring technology represented by BCG is more and more concerned by people.
The BCG signal represents weak vibration of a human body, and the conventional BCG signal sensing sensors mainly include a BCG sensor based on a piezoelectric film, a BCG sensor based on an optical fiber and the like. Compared with the BCG sensor based on the piezoelectric film, the BCG sensor based on the optical fiber has the advantages of electromagnetic interference resistance, high sensitivity, uncharged operation of an optical fiber pad and the like, is more suitable for medical scenes, and is concerned with.
Existing BCG sensors based on optical fibers may be classified into BCG sensors based on microbending optical fibers, BCG sensors based on fiber gratings, and BCG sensors based on fiber interferometers.
For the BCG sensor based on the microbend optical fiber, the main principle is to modulate BCG information on light intensity so as to realize measurement of the BCG information. For example, a first patent document (publication No. CN 107072565B) proposes a vital sign optical fiber sensor system and method, which discloses a microbend optical fiber BCG sensor based on light intensity modulation, in which multimode optical fibers are laid in a grid structure to form a microbend optical fiber sensor for sensing vital signs. The technology has the defects that the optical fiber element needs to be positioned below a human body, the optical fiber element is easy to be damaged by pressure, the optical fiber pad cannot be bent, and the measurement accuracy can be influenced by the fluctuation of the output optical power of a light source, the looseness of the connection position of an optical device and the like.
For the BCG sensor based on the fiber grating, the main principle is to modulate BCG information onto optical wavelength so as to realize the measurement of the BCG information. For example, patent document two (publication No. CN 109106372A) proposes a vital sign monitoring optical fiber mat based on optical fiber sensing technology, which discloses a vital sign detecting optical fiber mat containing an optical fiber grating, including an optical fiber mat, an independent headrest, an expanding and contracting mat, a folding calibration board, an air pump and a processing box, which arranges the optical fiber grating between the soft package shell of the independent pillow and the air bag, and inside the optical fiber mat, and this technology enlarges the deformation of the optical fiber grating through the air bag or the expanding and contracting mat to better monitor the data. The disadvantage of this technique is that the fiber grating needs to be located under the human body, which is prone to fiber element damage and the fiber mat cannot be bent. In addition, in the method, the fiber grating is required to be laid at each position in the fiber mat so that physiological information can be well sensed at different positions of the fiber mat, which further increases the cost of the fiber mat.
For the BCG sensor based on the optical fiber interferometer, the main principle is to modulate BCG information onto an optical phase so as to realize the measurement of the BCG information. The method has the problems of random drift of the offset phase and the like, and has a certain distance from practical application.
In summary, the existing optical fiber physiological information monitoring device generally has the problems that the optical fiber sensing element is positioned below the human body, the optical fiber element is easy to be damaged by pressure, the optical fiber pad can not be bent and the like, and part of the device also has the problems of low measurement precision and high cost.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a physiological information monitoring device based on optical fiber sound wave sensing. The technical problem to be solved by the invention is realized by the following technical scheme:
a physiological information monitoring device based on optical fiber acoustic wave sensing comprises a light source, a light path circulator, an air cushion, an optical acoustic wave sensing probe and a demodulator; wherein the content of the first and second substances,
the light source is used for generating a light signal;
the optical path circulator is used for receiving an optical signal from a light source through a first port and sending the optical signal to the optical acoustic wave sensing probe through a second port;
the air cushion is used for converting a weak vibration signal of a human body into a sound wave signal and transmitting the sound wave signal to the optical sound wave sensing probe;
the optical acoustic wave sensing probe is connected with the air cushion and used for sensing acoustic wave signals in the air cushion and modulating the spectrum of the output optical signals of the optical acoustic wave sensing probe by using the acoustic wave signals;
the optical path circulator is also used for receiving modulated optical signals output by the optical acoustic wave sensing probe through the second port and sending the modulated optical signals to the demodulator through the third port;
the demodulator is used for demodulating the spectral information of the input optical signal and converting the spectral information into an electric signal so as to obtain a human body weak vibration signal and extract physiological information from the human body weak vibration signal.
In one embodiment of the invention, the interior of the cushion is filled with gas or foam for supporting the shape of the cushion.
In one embodiment of the invention, the optical acoustic wave sensing probe is positioned inside the air cushion; or inside an air tube extending from the air cushion.
In one embodiment of the present invention, the optical acoustic wave sensing probe is an extrinsic type fiber fabry-perot sensing probe.
In one embodiment of the invention, the extrinsic optical fiber Fabry-Perot sensing probe comprises a first annular base, a first annular support, a first elastic diaphragm and a measuring optical fiber; wherein the content of the first and second substances,
the first annular base is fixedly connected with the first annular support, and the first elastic diaphragm is fixed between the first annular base and the first annular support;
one end of the measuring optical fiber is fixedly arranged at one end, opposite to the first elastic diaphragm, of the first annular support, and the other end of the measuring optical fiber is connected with a second port of the optical path circulator;
the first elastic diaphragm and the optical fiber end face of the measuring optical fiber form a Fabry-Perot cavity.
In one embodiment of the present invention, the optical acoustic wave sensing probe is a fiber grating acoustic wave sensing probe.
In one embodiment of the invention, the fiber grating acoustic wave sensing probe comprises a second annular base, a second annular bracket, a second elastic diaphragm, a fiber grating and a fiber grating tail fiber; wherein, the first and the second end of the pipe are connected with each other,
the second annular base is fixedly connected with the second annular support, and the second elastic diaphragm is fixed between the second annular base and the second annular support;
the fiber bragg grating is fixedly connected with the second elastic membrane;
one end of the fiber grating tail fiber is connected with the fiber grating, and the other end of the fiber grating tail fiber is connected with the second port of the optical path circulator.
In one embodiment of the invention, the fiber grating is arranged in parallel with the second elastic membrane and adhered above the second elastic membrane;
and the fiber grating tail fiber penetrates through the joint of the second annular base and the second annular bracket to be connected with the fiber grating.
In one embodiment of the present invention, the fiber grating is disposed perpendicular to the second elastic diaphragm, and one end of the fiber grating is connected to the second elastic diaphragm;
and the fiber grating tail fiber penetrates through the second annular bracket to be connected with the other end of the fiber grating.
In one embodiment of the invention, the light source is an ASE broadband light source or an SLD broadband light source;
the optical path circulating device is a 1 × 2 optical fiber coupler, a 2 × 2 optical fiber coupler or an optical fiber circulator;
the demodulator at least comprises a spectrometer module and an electric signal processing module.
The invention has the beneficial effects that:
1. the physiological information monitoring device based on optical fiber sound wave sensing converts a weak vibration signal of a human body into a sound wave signal by using the air cushion and transmits the sound wave signal to the optical sound wave sensing probe, and the optical sound wave sensing probe can not be positioned below an object to be measured, so that the probability of pressure loss of an optical fiber element is reduced, and the air cushion can be bent; in addition, because the monitoring device modulates the weak vibration signal of the human body on the spectrum, compared with an intensity modulation type optical fiber physiological information monitoring device, the monitoring device can effectively inhibit the influence of the fluctuation of the output light power of a light source, the looseness of the connection part of an optical device and the like on the measurement accuracy of the monitoring device; meanwhile, the device can sense the weak vibration of the human body at each position of the air cushion by only one sensing probe, so that the cost is reduced;
2. the optical acoustic wave sensing probe adopted by the invention has anti-electromagnetic interference capability, does not generate sparks or static electricity, further expands the use scene of the physiological information monitoring device, and can be used when nuclear magnetic resonance examination is carried out.
The present invention will be described in further detail with reference to the drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of a physiological information monitoring device based on optical fiber acoustic wave sensing according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a physiological information monitoring device based on optical fiber acoustic wave sensing and provided with an extrinsic optical fiber fabry-perot sensing probe according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a physiological information monitoring device based on fiber acoustic wave sensing and provided with a fiber grating acoustic wave sensing probe according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of another physiological information monitoring device based on fiber acoustic wave sensing and provided with a fiber grating acoustic wave sensing probe according to an embodiment of the present invention;
description of the reference numerals:
the device comprises a light source 1, a light path circulator 2, an air cushion 3, an optical acoustic wave sensing probe 4, a first annular base 40, a first annular support 41, a first elastic diaphragm 42, a measuring optical fiber 43, a Fabry-Perot cavity 44, a second annular base 45, a second annular support 46, a second elastic diaphragm 47, a fiber grating 48, a fiber grating pigtail 49 and a demodulator 5.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example one
Referring to fig. 1, fig. 1 is a schematic structural diagram of a physiological information monitoring device based on optical fiber acoustic wave sensing according to an embodiment of the present invention, which includes a light source 1, a light path circulator 2, an air cushion 3, an optical acoustic wave sensing probe 4, and a demodulator 5; wherein, the first and the second end of the pipe are connected with each other,
the light source 1 is used for generating light signals;
the optical path circulator 2 is used for receiving an optical signal from the light source 1 through a first port and sending the optical signal to the optical acoustic wave sensing probe 4 through a second port;
the air cushion 3 is used for converting a weak vibration signal of a human body into a sound wave signal and transmitting the sound wave signal to the optical sound wave sensing probe 4;
the optical acoustic sensing probe 4 is connected with the air cushion 3 and used for sensing acoustic signals in the air cushion 1 and modulating the spectrum of output optical signals of the optical acoustic sensing probe by using the acoustic signals;
the optical path circulator 2 is further configured to receive a modulated optical signal output from the optical acoustic wave sensing probe 4 through the second port and send the modulated optical signal to the demodulator 5 through the third port;
the demodulator 5 is used for demodulating the spectral information of the input optical signal and converting the spectral information into an electrical signal so as to acquire a weak human vibration signal and extract physiological information such as heart rate and respiratory rate from the weak human vibration signal.
Specifically, the optical acoustic wave sensing probe 4 may be located inside the air cushion 3, or may be located inside an air duct extending from the air cushion 3, as shown in fig. 1, which is not particularly limited in this embodiment.
Optionally, as an implementation manner of the present invention, the inside of the air cushion is filled with gas or foam for supporting the shape of the air cushion. When a human body is in contact with the air cushion, the human body weak vibration signal containing the BCG information can be converted into a sound wave signal through the air cushion and transmitted to the optical sound wave sensing probe, so that the monitoring of physiological information such as heart rate, respiratory rate and the like is realized.
Further, the light source 1 is an ASE broadband light source or an SLD broadband light source.
Further, the optical path circulator 2 is a 1 × 2 optical fiber coupler, a 2 × 2 optical fiber coupler, or an optical fiber circulator.
Further, the demodulator 5 at least comprises a spectrometer module and an electrical signal processing module. For the specific demodulation principle, reference may be made to the related art, and the embodiment will not be described in detail here.
The working process of the physiological information monitoring device based on optical fiber acoustic wave sensing provided by the embodiment is as follows:
generating an optical signal by a light source 1, and making the optical signal incident into a first port of an optical path circulator 2; the first port of the optical circuit circulator 2 receives the optical signal from the light source 1 and then sends the optical signal to the second port, and the optical signal is incident into the optical acoustic wave sensing probe 4. The human body weak vibration signal containing the human body physiological information is converted into a sound wave signal through the air cushion 3 and is transmitted to the optical sound wave sensing probe 4. Because the wavelength characteristic parameter of the optical acoustic wave sensing probe 4 outputting the optical signal changes with the change of the acoustic wave signal, the optical acoustic wave sensing probe 4 modulates the wavelength characteristic parameter of the output optical signal by using the acoustic wave signal and returns the wavelength characteristic parameter to the second port of the optical circuit circulator 2, and the second port receives the optical signal from the optical acoustic wave sensing probe 4 and sends the optical signal to the third port. The demodulator 5 receives and demodulates the spectrum information of the optical signal output by the optical acoustic sensing probe 4 through the third port, converts the spectrum information into an electric signal, and then amplifies and filters the electric signal to obtain a human body weak vibration signal and extract physiological information such as heart rate, respiratory rate and the like from the human body weak vibration signal.
The physiological information monitoring device based on optical fiber acoustic wave sensing provided by the embodiment utilizes the air cushion to convert the weak vibration signal of the human body into the acoustic wave signal and transmit the acoustic wave signal to the optical acoustic wave sensing probe, and the optical acoustic wave sensing probe can not be positioned below the human body, so that the probability of pressure loss of the optical fiber element is reduced, and the air cushion can be bent; in addition, because the monitoring device modulates the weak vibration signal of the human body on the spectrum, compared with an intensity modulation type optical fiber physiological information monitoring device, the monitoring device can effectively inhibit the influence of the fluctuation of the output light power of a light source, the looseness of the connection part of an optical device and the like on the measurement accuracy of the sensor; meanwhile, the device can sense the weak vibration of the human body at each position of the air cushion by only one sensing probe, so that the cost is reduced.
In addition, the optical acoustic wave sensing probe adopted by the embodiment has anti-electromagnetic interference capability, does not generate sparks or static electricity, and further enlarges the use scene of the physiological information monitoring device, for example, the physiological information monitoring device can be used during nuclear magnetic resonance examination.
Example two
In this embodiment, the optical acoustic wave sensing probe 4 is an extrinsic optical fiber fabry-perot sensing probe.
Specifically, referring to fig. 2, fig. 2 is a schematic structural diagram of a physiological information monitoring device based on optical fiber acoustic wave sensing and provided with an extrinsic optical fiber fabry-perot sensing probe according to an embodiment of the present invention, wherein,
the extrinsic optical fiber Fabry-Perot sensing probe comprises a first annular base 40, a first annular bracket 41, a first elastic diaphragm 42 and a measuring optical fiber 43; wherein, the first and the second end of the pipe are connected with each other,
the first annular base 40 is fixedly connected with the first annular support 41, and the first elastic diaphragm 42 is fixed between the first annular base 40 and the first annular support 41;
one end of the measurement optical fiber 43 is fixedly installed at one end of the first annular bracket 41 opposite to the first elastic diaphragm 42, and the other end of the measurement optical fiber 43 is connected with the second port of the optical path circulator 2;
the first elastic diaphragm 42 and the fiber end face of the measuring fiber 43 constitute a fabry-perot cavity 44.
Specifically, when a weak human body vibration signal is converted into a sound wave signal through the air cushion and acts on the first elastic diaphragm 42, the first elastic diaphragm 42 is forced to vibrate, so that the cavity length of the fabry-perot cavity 44 changes, the weak human body vibration signal can be obtained by detecting the cavity length change of the fabry-perot cavity 44, and physiological information such as heart rate and respiratory rate is extracted from the weak human body vibration signal.
In this embodiment, the formula for obtaining the cavity length information of the fabry-perot cavity 44 from the output interference spectrum of the extrinsic fiber fabry-perot probe is as follows:
in the above formula, d is the cavity length, n is the refractive index of the medium, λ 1 And λ 2 Two wavelengths in the output interference spectrum of the fabry-perot cavity 44,
for a wavelength from λ 2 Change to lambda 1 The phase of the interference spectrum waveform changes. For example, when two adjacent peaks (phase difference of 2 π) in the interference spectrum are measured at a wavelength λ 1 And λ 2 The Fabry-Perot cavity 44 has a cavity length of
Optionally, the cavity length of the fabry-perot cavity 44 in this embodiment is within 500 micrometers.
Further, the first elastic membrane 42 is a quartz membrane or a graphene membrane; the measurement fiber 43 is a single mode fiber, a multimode fiber, or a polarization maintaining fiber.
The working process of the physiological information monitoring device based on optical fiber sound wave sensing and provided with the extrinsic optical fiber Fabry-Perot sensing probe in the embodiment is as follows:
the emergent broadband light of the light source 1 enters a second port through a first port of the optical path circulator 2; the light at the second port of the optical circuit circulator 2 enters the fabry-perot cavity 44 via the measurement fiber 43. In the optical acoustic wave sensing probe 4, light is reflected and transmitted at the end face of the optical fiber constituting the fabry-perot cavity 44, and reflected light and transmitted light are generated; the transmitted light is reflected at the inner surface and coupled to the measuring fiber 43 again after propagating to the first elastic diaphragm 41; the reflected light and the transmitted light reach three ports of the optical path circulator 2 through the measuring optical fiber 43 and the second port of the optical fiber circulator 2 and enter the demodulator 5; the demodulator 5 obtains cavity length information of the fabry-perot cavity 44 according to the interference spectrum of the reflected light and the transmitted light, converts the cavity length information into an electric signal, amplifies and filters the electric signal to obtain a human body weak vibration signal and extracts physiological information such as heart rate and respiratory rate from the human body weak vibration signal.
EXAMPLE III
In this embodiment, the optical acoustic wave sensing probe 4 is a fiber grating acoustic wave sensing probe.
Specifically, please refer to fig. 3, fig. 3 is a schematic structural diagram of a physiological information monitoring device based on fiber acoustic wave sensing and provided with a fiber grating acoustic wave sensing probe according to an embodiment of the present invention; wherein, the first and the second end of the pipe are connected with each other,
the fiber grating acoustic wave sensing probe comprises a second annular base 45, a second annular support 46, a second elastic diaphragm 47, a fiber grating 48 and a fiber grating tail fiber 49; wherein the content of the first and second substances,
the second annular base 45 is fixedly connected with the second annular support 46, and the second elastic diaphragm 47 is fixed between the annular base 45 and the second annular support 46;
the fiber bragg grating 48 is fixedly connected with the second elastic membrane 47;
one end of the fiber grating tail fiber 49 is connected to the fiber grating 48, and the other end is connected to the second port of the optical circuit circulator 2.
Optionally, as an implementation manner, the second annular base 45 and the second annular support 46 are circular, and they may be connected by an adhesive to achieve the purpose of fixing the second elastic diaphragm 47.
In the present embodiment, the fiber grating 48 is disposed in parallel with the second elastic membrane 47, and is adhered above the second elastic membrane 47, as shown in fig. 3. The fiber grating pigtail 49 is connected to the fiber grating 48 through the junction of the second annular mount 45 and the second annular support 46.
Optionally, the present embodiment selects an epoxy resin glue as the adhesive for bonding the fiber grating 48 and the second elastic membrane 47. The fiber grating pigtail 49 and the fiber grating 48 may be bonded using the adhesive.
Specifically, when the weak human body vibration signal is converted into an acoustic wave signal through the air cushion and acts on the second elastic membrane 47, the second elastic membrane 47 is forced to vibrate, the grating pitch of the fiber grating 48 adhered to the second elastic membrane 47 changes, so that the wavelength of the reflected light of the fiber grating changes accordingly, the weak human body vibration signal can be obtained through the change of the wavelength of the reflected light, and physiological information such as heart rate and respiratory rate can be extracted from the weak human body vibration signal.
Further, the second elastic membrane 47 is a polyester film or a polymer film, and the fiber grating 48 is a fiber bragg grating or a long-period grating.
The working process of the physiological information monitoring device based on optical fiber acoustic wave sensing and provided with the optical fiber grating acoustic wave sensing probe comprises the following steps:
emergent light of the light source 1 enters a second port through a first port of the light path circulator 2; the light entering the second port of the optical circuit circulator 2 enters the fiber grating 48 through the fiber grating tail fiber 49; when a weak human body vibration signal is converted into an acoustic wave signal through the air cushion 3 and acts on the second elastic membrane 47, the wavelength of reflected light of the fiber bragg grating 48 adhered to the elastic membrane 47 changes; the reflected light signal of the fiber grating reaches the third port of the optical path circulator 2 through the fiber grating tail fiber 49 and enters the demodulator 5; the demodulator 5 demodulates the spectrum information of the fiber bragg grating reflected light, converts the spectrum information into an electric signal, amplifies and filters the electric signal to obtain a human body weak vibration signal, and extracts physiological information such as heart rate, respiratory rate and the like from the human body weak vibration signal.
Compared with the existing fiber bragg grating physiological information monitoring device, the embodiment can realize that the weak vibration signals of the human body can be sensed at all the positions of the air cushion by utilizing one fiber bragg grating so as to extract the physiological information, and the cost is reduced.
Example four
On the basis of the third embodiment, the present embodiment provides another implementation manner of the fiber grating acoustic wave sensing probe, please refer to fig. 4, fig. 4 is another schematic structural diagram of the physiological information monitoring device based on fiber acoustic wave sensing and provided with the fiber grating acoustic wave sensing probe according to the embodiment of the present invention; wherein, the first and the second end of the pipe are connected with each other,
the fiber bragg grating 48 is arranged perpendicular to the second elastic diaphragm 47, and one end of the fiber bragg grating is connected with the second elastic diaphragm 47;
the fiber grating pigtail 49 is connected to the other end of the fiber grating 48 through the second annular support 46.
Specifically, the fiber grating 48 is bonded to the second elastic diaphragm 47 by an adhesive, and the fiber grating pigtail 49 is bonded to the fiber grating 48 by an adhesive at a position passing through the second annular bracket 46.
Optionally, the adhesive used in this embodiment may be an epoxy glue.
The physiological information monitoring device based on fiber acoustic wave sensing and provided with the fiber grating acoustic wave sensing probe in the embodiment has the same working principle and process as the monitoring device provided in the third embodiment, and is not described in detail herein.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A physiological information monitoring device based on optical fiber acoustic wave sensing is characterized by comprising a light source (1), a light path circulator (2), an air cushion (3), an optical acoustic wave sensing probe (4) and a demodulator (5); wherein the content of the first and second substances,
the light source (1) is used for generating a light signal;
the optical path circulator (2) is used for receiving an optical signal from the light source (1) through a first port and sending the optical signal to the optical acoustic wave sensing probe (4) through a second port;
the air cushion (3) is used for converting a weak vibration signal of a human body into a sound wave signal and transmitting the sound wave signal to the optical sound wave sensing probe (4);
the optical acoustic sensing probe (4) is connected with the air cushion (3) and is used for sensing an acoustic signal in the air cushion (1) and modulating the spectrum of an output optical signal by using the acoustic signal;
the optical path circulator (2) is also used for receiving a modulated optical signal output by the optical acoustic wave sensing probe (4) through the second port and sending the modulated optical signal to the demodulator (5) through the third port;
the demodulator (5) is used for demodulating the spectral information of the input optical signal and converting the spectral information into an electric signal so as to acquire a human body weak vibration signal and extract physiological information from the human body weak vibration signal.
2. The device for monitoring physiological information based on optical fiber acoustic wave sensing according to claim 1, wherein the air cushion (3) is filled with gas or foam plastic inside for supporting the shape of the air cushion.
3. The optical fiber acoustic wave sensing-based physiological information monitoring device according to claim 1, wherein the optical acoustic wave sensing probe (4) is located inside the air cushion (3); or inside an air duct extending from said air cushion (3).
4. The optical fiber acoustic wave sensing-based physiological information monitoring device according to claim 1, wherein the optical acoustic wave sensing probe (4) is an extrinsic optical fiber Fabry-Perot sensing probe.
5. The optical fiber acoustic wave sensing-based physiological information monitoring device according to claim 4, wherein the extrinsic type fiber Fabry-Perot sensing probe comprises a first annular base (40), a first annular support (41), a first elastic diaphragm (42), and a measuring fiber (43); wherein the content of the first and second substances,
the first annular base (40) is fixedly connected with the first annular support (41), and the first elastic diaphragm (42) is fixed between the first annular base (40) and the first annular support (41);
one end of the measuring optical fiber (43) is fixedly arranged at one end of the first annular bracket (41) opposite to the first elastic diaphragm (42), and the other end of the measuring optical fiber (43) is connected with a second port of the optical path circulating device (2);
the first elastic diaphragm (42) and the fiber end face of the measuring fiber (43) form a Fabry-Perot cavity (44).
6. The physiological information monitoring device based on optical fiber acoustic wave sensing according to claim 1, wherein the optical acoustic wave sensing probe (4) is a fiber grating acoustic wave sensing probe.
7. The fiber optic acoustic wave sensing-based physiological information monitoring device according to claim 6, wherein the fiber grating acoustic wave sensing probe comprises a second annular base (45), a second annular support (46), a second elastic diaphragm (47), a fiber grating (48) and a fiber grating tail fiber (49); wherein, the first and the second end of the pipe are connected with each other,
the second annular base (45) is fixedly connected with the second annular bracket (46), and the second elastic diaphragm (47) is fixed between the second annular base (45) and the second annular bracket (46);
the fiber grating (48) is fixedly connected with the second elastic membrane (47);
one end of the fiber grating tail fiber (49) is connected with the fiber grating (48), and the other end is connected with the second port of the optical path circulator (2).
8. The device for monitoring physiological information based on fiber optic acoustic wave sensing according to claim 7, wherein the fiber grating (48) is disposed in parallel with the second elastic membrane (47) and adhered above the second elastic membrane (47);
the fiber grating tail fiber (49) penetrates through the joint of the second annular base (45) and the second annular bracket (46) to be connected with the fiber grating (48).
9. The device for monitoring physiological information based on fiber optic acoustic wave sensing according to claim 7, wherein the fiber grating (48) is disposed perpendicular to the second elastic membrane (47), and one end of the fiber grating is connected to the second elastic membrane (47);
the fiber grating tail fiber (49) penetrates through the second annular support (46) to be connected with the other end of the fiber grating (48).
10. The physiological information monitoring device based on optical fiber acoustic wave sensing of claim 1, wherein the light source (1) is an ASE broadband light source or an SLD broadband light source;
the optical path circulator (2) is a 1 × 2 optical fiber coupler, a 2 × 2 optical fiber coupler or an optical fiber circulator;
the demodulator (5) at least comprises a spectrometer module and an electric signal processing module.
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