CN107374627A - Signal sensor and signal detection method - Google Patents
Signal sensor and signal detection method Download PDFInfo
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- CN107374627A CN107374627A CN201710564554.8A CN201710564554A CN107374627A CN 107374627 A CN107374627 A CN 107374627A CN 201710564554 A CN201710564554 A CN 201710564554A CN 107374627 A CN107374627 A CN 107374627A
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- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
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Abstract
The invention discloses a kind of signal sensor and signal detection method.Wherein, the signal sensor includes：Radio frequency rf signal generator, for producing RF signals；RF antennas, alternating electric field is encouraged for the RF signals according to input, and received electric field perturbations signal；Wherein, electric field perturbations signal is disturbed by alternating electric field by the vibration signal of skin surface to be measured, and the vibration signal amplitude of skin surface to be measured is modulated to caused amplitude-modulated signal on alternating electric field；Amplitude modulation envelope wave detector, for demodulating the vibration signal of skin surface to be measured from electric field perturbations signal.By the present invention, solve in correlation technique, when being measured to tissue physiology's activity, measurement complexity, awkward technical problem be present.
Description
Technical Field
The invention relates to the field of signal processing, in particular to a signal detector and a signal detection method.
Background
Currently, there are various technical approaches for non-invasive human tissue physiological signal detection. In the field of cardiovascular condition parameter detection, piezoelectric signal sensors, Electrocardiograph (ECG) sensors, Photoplethysmography (PPG) sensors, bioimpedance (impedance cardiography) sensors, doppler shift/phase shift signal sensors, and the like have all made remarkable research results, and many related products are available.
The physiological and pathological information of human body extracted from pulse wave is regarded as the basis for clinical diagnosis and treatment, and has been paid attention by the medical field. Research shows that more real and effective signals can be obtained by measuring pulse waves on the aorta blood vessels of the human body. However, since the aortic blood vessels are buried in the complicated tissues of the human body, such as skin, fat, muscle, and bone, the aortic blood vessels pose a serious challenge to various detection techniques.
The piezoelectric signal sensor inevitably needs the air bag to apply external pressure to press the blood vessel to complete blood pressure measurement, and the external pressure often brings adverse reactions of emotional stress, feeling discomfort and the like to people, so that the detection precision and the use experience are influenced; the electrocardiosignal sensor needs to directly stick a metal electrode plate on the skin of a human body, or at least needs to touch the electrode by hands; the photoelectric volume pulse wave signal sensor is only suitable for measuring capillary vessels on the surface of skin at present, and the signal is extremely unstable and is influenced by skin color; the biological impedance signal sensor also needs to stick measuring electrodes around the heart; the signals detected by the doppler shift/phase shift detection method are very weak, are easily interfered, require complex signal processing, and have low detection accuracy.
In the related art, when detecting physiological activities of human tissues, a signal input port is generally connected to the human tissues to be detected, and input signals and output signals of a signal output port are measured through corresponding measurement circuits, so that physiological activity signals of the human tissues are obtained.
In the related art, another measurement method is: based on inductive or capacitive sensing, the parasitic capacitance or inductance generated by the human tissue changes with the periodic pulsation of the pulse, thereby causing a change in the sensor resonant circuit parameter (resonant frequency). In order to obtain a high detection sensitivity, the resonant circuit is required to have a high intrinsic quality factor. Due to the high loss and high dielectric property of human tissue, the resonant circuit is very susceptible, which brings many difficulties and inconveniences to the practical use of the sensor.
Therefore, in the related art, when the physiological activities of the tissues are measured, the measurement is complicated and inconvenient.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a signal detector and a signal detection method, which at least solve the technical problems of complex measurement and inconvenient use when measuring the physiological activities of tissues in the related technology.
According to an aspect of an embodiment of the present invention, there is provided a signal detector including: a Radio Frequency (RF) signal generator for generating an RF signal; the RF antenna is used for exciting an alternating electric field according to the input RF signal and receiving an electric field disturbance signal; the electric field disturbance signal is an amplitude modulation signal generated by modulating the amplitude of the vibration signal of the skin surface to be detected onto the alternating electric field; and the amplitude modulation envelope detector is used for demodulating the vibration signal of the surface of the skin to be detected from the electric field disturbance signal.
Optionally, the signal detector further comprises: the RF output power amplifier is used for amplifying the RF signal generated by the radio frequency RF signal generator and controlling the output power to be-10 dBm to 20 dBm; an RF output matching circuit for matching an output impedance of the RF signal to an input impedance of an RF antenna; an RF input matching circuit for accomplishing maximum power transfer of the electric field perturbation signal received from the RF antenna.
Optionally, the signal detector further comprises: the first filter is used for filtering interference signals outside the working frequency band of the RF signals in the electric field disturbance signals output from the RF input matching circuit; the second filter is used for filtering interference signals outside the preset cut-off frequency in the vibration signals of the skin surface to be detected output from the amplitude modulation envelope detector according to the frequency spectrum characteristics of the vibration signals of the skin surface to be detected; the signal amplifier is used for amplifying the demodulated vibration signal of the surface of the skin to be detected; the analog-digital AD converter is used for converting the demodulated vibration signal of the surface of the skin to be detected into a digital signal; and the data signal processor is used for processing and displaying the digital signal.
Optionally, the number of the RF antennas is one or more, the RF antennas support common transceiving or separate transceiving, and the RF antennas use unbalanced feeding.
Optionally, the RF antenna is fabricated on a flexible circuit board FPC; or the RF antenna is manufactured on the flexible conductive braided fabric, wherein the RF antenna is manufactured on the underwear in a mode of adopting a conductive yarn embroidery process or cutting and then pasting conductive woven fabric.
Optionally, one or more coupling components and matching circuits corresponding to the one or more coupling components are added within a predetermined distance around the RF antenna for changing the electric field distribution of the RF antenna.
Optionally, the coupling component is a metal structure, and the shape of the coupling component is one of: a rectangular patch, a meander line, a deformation of a rectangular patch, a deformation of a meander line, wherein a spacing between the coupling component and the RF antenna is adjustable; and the matching circuit corresponding to the one or more coupling parts is used for interconnecting the corresponding coupling parts and the circuit metal ground.
Optionally, the signal detector further comprises: and the insulating isolation layer is arranged between the RF antenna and the surface of the skin to be detected and used for isolating an air interval.
Optionally, the insulating isolation layer is made of medical silica gel, animal leather and leather.
According to another aspect of the present invention, there is provided a signal detection method including: generating an RF signal using a radio frequency RF signal generator; exciting an alternating electric field according to the input RF signal through an RF antenna, and receiving an electric field disturbance signal; the electric field disturbance signal is an amplitude modulation signal generated by modulating the amplitude of the vibration signal of the skin surface to be detected onto the alternating electric field; and demodulating the vibration signal of the surface of the skin to be detected from the electric field disturbance signal by using an amplitude modulation envelope detector.
Optionally, after generating the RF signal with the RF signal generator, amplifying the RF signal generated by the radio frequency RF signal generator with an RF output power amplifier; and matching an output impedance of the RF signal to an input impedance of an RF antenna through an RF output matching circuit; before the amplitude modulation envelope detector is adopted to demodulate the vibration signal of the surface of the skin to be detected from the electric field disturbance signal, an RF input matching circuit is adopted to finish the maximum power transmission of the electric field disturbance signal received from the RF antenna; filtering interference signals outside the working frequency band of the RF signals in the electric field disturbance signals output from the RF input matching circuit by adopting a first filter; after the vibration signal of the surface of the skin to be detected is demodulated from the electric field disturbance signal by using an amplitude modulation envelope detector, filtering interference signals outside a preset cut-off frequency in the vibration signal of the surface of the skin to be detected output from the amplitude modulation envelope detector by using a second filter according to the frequency spectrum characteristic of the vibration signal of the surface of the skin to be detected; amplifying the demodulated vibration signal of the surface of the skin to be detected through a signal amplifier; converting the demodulated vibration signal of the surface of the skin to be detected into a digital signal through an analog-digital (AD) converter; and processing and displaying the digital signal by adopting a data signal processor.
In the embodiment of the invention, the vibration amplitude of the vibration signal on the surface of the skin to be measured is modulated to the electric field disturbance signal generated on the alternating electric field, and the vibration signal on the surface of the skin to be measured is demodulated from the electric field disturbance signal, so that the aim of directly measuring the tissue physiological activity is fulfilled, and the technical problems of complex measurement and inconvenient use in the measurement of the tissue physiological activity in the related technology are solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of a signal detector according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an RF antenna of a wearable probe for detecting human skin surface vibrations according to a first embodiment of the present invention;
fig. 3 is a schematic view of a wearable detector device for detecting human skin surface vibrations according to a first embodiment of the present invention;
FIG. 4 is a schematic illustration of the results of detecting skin surface vibrations at the radial artery of a human body in accordance with an embodiment of the present invention;
fig. 5 is a schematic view of a wearable detector device for detecting human skin surface vibrations according to a second embodiment of the present invention;
fig. 6 is a flow chart according to the first embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Tissue physiological activity, for example, in superficial arteries of the human body such as radial artery, brachial artery, carotid artery, subclavian artery, etc., usually arterial blood vessels are close to the skin surface, and the vibration of blood vessels caused by pulse waves can be directly transmitted and reflected to the vibration of the adjacent skin surface. A large number of clinical measurement results prove that the pulse wave represents comprehensive signals of the aspects of the shape (wave shape), the strength (wave amplitude), the speed (wave speed), the rhythm (wave period) and the like, and a plurality of physiological and pathological characteristics of the human cardiovascular system are reflected to a great extent. Based on this, in an embodiment of the present invention, a signal detector is provided, and fig. 1 is a schematic structural diagram of a signal detector according to an embodiment of the present invention, as shown in fig. 1, the signal detector includes:
a Radio Frequency (RF) signal generator 11 for generating an RF signal, which may be used, for example, to generate a continuous wave RF signal, the Frequency of which is within the resonant Frequency band of the RF antenna; an RF antenna 12 connected to the RF signal generator 11, configured to excite an alternating electric field according to an input RF signal, and receive an electric field disturbance signal, where the electric field disturbance signal is an amplitude modulation signal generated by modulating an amplitude of the alternating electric field by a vibration signal of the skin surface to be measured; and the amplitude modulation envelope detector 13 is connected with the RF antenna 12 and is used for demodulating a vibration signal of the surface of the skin to be detected from the electric field disturbance signal.
Through above-mentioned signal detector, adopt the electric field disturbing signal who produces on modulating the alternating electric field with the amplitude of the skin surface vibration signal that awaits measuring to demodulate the mode of the skin surface vibration signal that awaits measuring from this electric field disturbing signal, reached the purpose of direct measurement tissue physiological activity, and then solved in the correlation technique, when measuring tissue physiological activity, there is the measurement complicacy, awkward technical problem.
The RF antenna can adopt unbalanced feed, work in a near-field mode and be used for generating an alternating oscillating electric field in the skin surface area of a human body to be detected; the alternating electric field is disturbed by the vibration of the skin surface of the human body, so that the amplitude of the vibration of the skin surface is modulated onto the alternating electric field to generate an amplitude-modulated electric field disturbance signal. In addition, the RF antenna may be one or more, and may support common transmission and reception or separate transmission and reception. Therefore, the method can be flexibly selected according to specific needs or design requirements.
Alternatively, the RF antenna may be preferentially fabricated on a Flexible Printed Circuit (FPC) dielectric substrate, where the FPC dielectric substrate has certain flexibility and can be well conformal and freely attached to the skin surface of human tissue.
Alternatively, the RF antenna can also be preferentially manufactured on a flexible metal braided fabric, and manufactured on the underwear in a mode of adopting a metal yarn embroidery process or cutting and pasting a conductive cloth.
Optionally, one or more coupling components and their corresponding matching circuits may be added within a predetermined distance around the RF antenna to change the electric field distribution near the RF antenna to obtain the maximum electric field strength in the target area; typically the predetermined distance is no greater than a quarter wavelength of the operating frequency of the RF antenna, wherein the matching circuit is an interconnection between the coupling component and circuit metal ground.
Optionally, one or more metal structures may be added as coupling components on both sides of the RF antenna, and the metal structures may be rectangular sheets, meander lines or variations thereof. Wherein, the distance between the added metal structure and the antenna is adjustable. The shape and the distance of the coupling parts can be optimized, and the coupling parts are in metal ground interconnection matching with the circuit, so that the electric field intensity and distribution on two sides of the antenna are adjusted, and the amplitude modulation effect of skin surface vibration on the alternating electric field near the antenna is improved.
For simplification of the apparatus, the signal detector may further preferably be provided with a duplexer connected to the RF antenna for realizing the transceiving common use of the RF antenna.
In order to ensure safety, an insulating isolation layer is arranged between the RF antenna and the surface of the skin to be detected; an insulating isolation layer with low dielectric loss and biocompatibility is arranged between the RF antenna and the surface of human skin.
It should be noted that the insulating isolation layer may be made of medical silica gel, animal leather, or leather, for example, the insulating isolation layer with low dielectric loss may be made of medical silica gel as a main material, and the RF antenna is wrapped by injection molding of medical silica gel, so that the medium between the isolation layer and the skin surface is air by slotting or ribbing.
Optionally, the insulating isolation layer may be made of animal cortex such as cow leather and sheep leather, and the RF antenna is covered with the animal cortex by grooving or chamfering, so that the medium between the isolation layer and the skin surface is air.
In order to make the signal output to the RF antenna suitable, the probe may further include: an RF output power amplifier for amplifying the continuous wave RF signal and limiting the output power to-10 dBm to 20 dBm.
In addition, the probe may further include: an RF output matching circuit for matching an output impedance of the RF signal to an input impedance of an RF antenna, e.g., matching an output impedance of an RF signal output by the RF signal source or RF output power amplifier to an input impedance of an RF antenna; and the RF input matching circuit is used for completing the maximum power transmission of the electric field disturbance signal received from the RF antenna. Enabling as lossless a transmission of the RF signal as possible.
In order to effectively control the interference of the interference signal, the signal detector may further include: the first filter is used for filtering interference signals outside the working frequency band of the continuous wave RF signals.
In order to further avoid the interference of the interference signal, the signal detector may further include: and the second filter is used for selecting proper cut-off frequency according to the frequency spectrum characteristics of the vibration signals on the surface of the skin of the human body and filtering other interference signals.
After demodulating out the vibration signal of the skin surface that awaits measuring, for effectively realizing carrying out effective processing to the vibration signal of this skin surface that awaits measuring, this signal detector still includes: the signal amplifier is used for amplifying the demodulated vibration signal of the surface of the skin to be detected; the AD converter is used for converting the demodulated human skin surface vibration signal into a digital signal; and a digital signal processor for performing subsequent arithmetic processing and display on the converted digital signal.
It should be noted that the detector provided in the above embodiments may be a wearable detector for detecting human skin surface vibration, and effectively solve the technical problems that the detector needs to be pressurized by an airbag and directly contacted with skin when detecting a physiological tissue in the related art, and is easily interfered and has low detection accuracy.
The following description will take an example of a wearable detector for detecting human skin surface vibration as a signal detector.
Fig. 2 is a schematic diagram of an RF antenna of the wearable detector for detecting human skin surface vibration according to the first embodiment of the present invention, as shown in fig. 2, the RF antenna includes:
the RF antenna radiator is a single radiator, adopts unbalanced feeding to improve the electric field coupling strength of the antenna and human tissues and is beneficial to the design of coupling parts around the antenna.
The coupling parts 1 and 2 are respectively distributed on two sides of the RF antenna radiator; the shape of the coupling part, and the indirection to the RF antenna radiator, is adjustable.
The matching circuit 1 and the matching circuit 2 are respectively connected with the corresponding coupling parts and realize different matching, so that the effects of adjusting the electric field distribution and improving the amplitude modulation effect of skin surface vibration are achieved.
Fig. 3 is a schematic diagram of a wearable detector device for detecting human skin surface vibration according to a first embodiment of the invention, as shown in fig. 3, the detector device comprises:
an RF antenna 12, which may be unbalanced fed, operates in near field mode.
Wherein, the RF antenna 12 can be designed as a flexible antenna to be more easily fit with human body; optionally, the RF antenna 12 is fabricated on the flexible FPC dielectric substrate by a planar printing method; optionally, the RF antenna 12 is manufactured on the close-fitting clothing by adopting a conductive yarn embroidery process or a conductive fabric cutting and pasting manner;
a duplexer 38; the antenna is connected with the RF antenna to realize the transceiving sharing of the RF antenna;
an insulating isolation layer 39; a biocompatible insulating spacer layer having low dielectric loss between said RF antenna and the skin surface of the human body;
wherein the insulating isolation layer has low dielectric loss, and the thickness should be as thin as possible, and preferably not more than 1mm, so as to reduce the loss of energy propagating in the medium. The insulating isolation layer has good biocompatibility so as to ensure the safety of long-term contact with human skin; the insulating layer also has good mechanical flexibility, can be well conformal with the skin of each part of the human body, and enough air space is introduced between the insulating layer and the skin to ensure that the insulating layer does not press the skin surface to vibrate.
Optionally, the low dielectric loss and biocompatible insulating isolation layer is made of medical silica gel as a main material, the RF antenna is wrapped by the medical silica gel through injection molding, and a medium between the isolation layer and the skin surface is air through slotting or ribbing.
Optionally, the low dielectric loss and biocompatible insulating isolation layer is made of animal cortex such as cow leather and sheep leather, and leather is used as main material, and the medium between the isolation layer and the skin surface is air by covering the animal cortex for the RF antenna through slotting or ribbing.
An RF signal generator 11; generating a continuous wave RF signal having a frequency within the resonant frequency band of the RF antenna;
an RF output power amplifier 36; amplifying the continuous wave RF signal, the output power being limited to-10 dBm to 20 dBm;
an RF output matching circuit 37; matching an output impedance of the RF output power amplifier to an input impedance of the antenna in a maximum power matching manner;
an RF input matching circuit 35; matching the output impedance of the antenna to a next-stage circuit in a maximum power matching mode;
a first filter 34; filtering out interference signals outside the working frequency band of the continuous wave RF signals;
an amplitude modulation envelope detector 13; demodulating an amplitude-modulated electric field disturbance signal carrying a skin surface vibration signal;
a second filter 33; selecting a proper cut-off frequency according to the characteristics of the vibration signal on the surface of the skin of the human body, and filtering other interference signals;
a signal amplifier 32; the vibration signal processing module is used for amplifying the demodulated vibration signal of the surface of the skin to be detected;
an AD converter and digital signal processor 31; and converting the demodulated human skin surface vibration signal into a digital signal, and performing subsequent algorithm processing.
Fig. 4 is a schematic diagram of a detection result of skin surface vibration at the radial artery of a human body according to an embodiment of the present invention, a waveform of a pulse signal obtained by a wrist-worn watch test using a 418MHz detection signal is shown in fig. 4, and the test result shows: peak amplitude 8520000, trough amplitude 8350000, pulse wave state continuous with time, etc. The test result shows that the detection method for the human skin surface vibration provided by the embodiment of the invention is applicable and has good results.
Fig. 5 is a schematic diagram of a wearable detector device for detecting human skin surface vibrations according to a second embodiment of the present invention, which differs from fig. 3 in that the amplitude modulation envelope detector 13 is replaced by a mixer 51 and the signal amplifier 32 is omitted, as shown in fig. 5. The mixer 51 needs the RF signal generator 11 to provide one path of RF signal as a local oscillation signal for synchronous demodulation with the received signal after the first filter 34, which can increase the conversion gain of the demodulation circuit and save signal amplifiers.
According to the embodiment of the invention, a wearable detection method for detecting the vibration of the surface of the skin of a human body is provided. The detection method may be performed by a detector arrangement according to a first embodiment of the invention, fig. 6 is a flow chart according to a first embodiment of the invention, as shown in fig. 6, the method comprising the steps of:
step S101, placing an RF antenna on the surface of skin with superficial vibration of a human body, such as corresponding positions of radial artery, brachial artery, carotid artery, subclavian artery and the like;
step S102, an RF signal generator generates a continuous wave RF signal, the continuous wave RF signal is amplified by an RF output power amplifier and is connected to the signal input end of an antenna duplexer through an RF output matching circuit; at this time, an alternating oscillating electric field is excited in the vicinity around the antenna; the alternating electric field is disturbed by the vibration of the skin surface of the human body, so that the vibration amplitude of the skin surface is modulated onto the alternating electric field to generate an amplitude-modulated electric field disturbance signal;
step S103, the electric field disturbance signal is detected by the RF antenna and is connected to the RF input matching circuit through the output port of the duplexer;
s104, filtering interference signals outside a working frequency band through a first filter, and demodulating vibration signals on the surface of the skin of the human body by an amplitude modulation envelope detector;
and step S105, filtering the demodulated human skin surface vibration signal through a second filter, and inputting the signal into a digital signal processor for subsequent processing through AD conversion.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, a division of a unit may be a division of a logic function, and an actual implementation may have another division, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or may not be executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (11)
1. A signal detector, comprising:
a Radio Frequency (RF) signal generator for generating an RF signal;
the RF antenna is used for exciting an alternating electric field according to the input RF signal and receiving an electric field disturbance signal; the electric field disturbance signal is an amplitude modulation signal generated by modulating the amplitude of the vibration signal of the skin surface to be detected onto the alternating electric field;
and the amplitude modulation envelope detector is used for demodulating the vibration signal of the surface of the skin to be detected from the electric field disturbance signal.
2. The signal detector of claim 1, further comprising:
the RF output power amplifier is used for amplifying the RF signal generated by the radio frequency RF signal generator and controlling the output power to be-10 dBm to 20 dBm;
an RF output matching circuit for matching an output impedance of the RF signal to an input impedance of an RF antenna;
an RF input matching circuit for accomplishing maximum power transfer of the electric field perturbation signal received from the RF antenna.
3. The signal detector of claim 1, further comprising:
the first filter is used for filtering interference signals outside the working frequency band of the RF signals in the electric field disturbance signals output from the RF input matching circuit;
the second filter is used for filtering interference signals outside the preset cut-off frequency in the vibration signals of the skin surface to be detected output from the amplitude modulation envelope detector according to the frequency spectrum characteristics of the vibration signals of the skin surface to be detected;
the signal amplifier is used for amplifying the demodulated vibration signal of the surface of the skin to be detected;
the analog-digital AD converter is used for converting the demodulated vibration signal of the surface of the skin to be detected into a digital signal;
and the data signal processor is used for processing and displaying the digital signal.
4. The signal detector of claim 1, wherein the RF antenna is one or more of a common RF antenna or a separate RF antenna, and wherein the RF antenna is fed non-balanced.
5. The signal detector of claim 1,
the RF antenna is manufactured on the Flexible Printed Circuit (FPC);
or,
the RF antenna is manufactured on the flexible conductive braided fabric, wherein the RF antenna is manufactured on the underwear in a mode of cutting and pasting conductive yarn embroidery process or conductive woven fabric.
6. The signal detector of claim 1,
one or more coupling parts and matching circuits corresponding to the one or more coupling parts are added in a preset distance around the RF antenna and used for changing the electric field distribution of the RF antenna.
7. The signal detector of claim 6,
the coupling component is of a metal structure, and the shape of the coupling component is one of the following: a rectangular patch, a meander line, a deformation of a rectangular patch, a deformation of a meander line, wherein a spacing between the coupling component and the RF antenna is adjustable;
and the matching circuit corresponding to the one or more coupling parts is used for interconnecting the corresponding coupling parts and the circuit metal ground.
8. The signal detector of claim 1, further comprising:
and the insulating isolation layer is arranged between the RF antenna and the surface of the skin to be detected and used for isolating an air interval.
9. The signal detector of claim 8, wherein the insulating isolation layer is made of medical silica gel, animal leather, or leather.
10. A method of signal detection, comprising:
generating an RF signal using a radio frequency RF signal generator;
exciting an alternating electric field according to the input RF signal through an RF antenna, and receiving an electric field disturbance signal; the electric field disturbance signal is an amplitude modulation signal generated by modulating the amplitude of the vibration signal of the skin surface to be detected onto the alternating electric field;
and demodulating the vibration signal of the surface of the skin to be detected from the electric field disturbance signal by using an amplitude modulation envelope detector.
11. The signal detection method according to claim 10,
amplifying the RF signal generated by the radio frequency RF signal generator with an RF output power amplifier after generating the RF signal with the RF signal generator; and matching an output impedance of the RF signal to an input impedance of an RF antenna through an RF output matching circuit;
before the amplitude modulation envelope detector is adopted to demodulate the vibration signal of the surface of the skin to be detected from the electric field disturbance signal, an RF input matching circuit is adopted to finish the maximum power transmission of the electric field disturbance signal received from the RF antenna; filtering interference signals outside the working frequency band of the RF signals in the electric field disturbance signals output from the RF input matching circuit by adopting a first filter;
after the vibration signal of the surface of the skin to be detected is demodulated from the electric field disturbance signal by using an amplitude modulation envelope detector, filtering interference signals outside a preset cut-off frequency in the vibration signal of the surface of the skin to be detected output from the amplitude modulation envelope detector by using a second filter according to the frequency spectrum characteristic of the vibration signal of the surface of the skin to be detected; amplifying the demodulated vibration signal of the surface of the skin to be detected through a signal amplifier; converting the demodulated vibration signal of the surface of the skin to be detected into a digital signal through an analog-digital (AD) converter; and processing and displaying the digital signal by adopting a data signal processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710564554.8A CN107374627A (en) | 2017-07-11 | 2017-07-11 | Signal sensor and signal detection method |
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