WO2019010635A1

WO2019010635A1 - Signal detector and signal detection method

Info

Publication number: WO2019010635A1
Application number: PCT/CN2017/092524
Authority: WO
Inventors: 刘振哲; 李舟健; 赵林; 陈洋
Original assignee: 悦享趋势科技（北京）有限责任公司
Priority date: 2017-07-11
Filing date: 2017-07-11
Publication date: 2019-01-17

Abstract

Provided are a signal detector and a signal detection method. The signal detector comprises: a radio frequency (RF) signal generator (11) for generating an RF signal; an RF antenna (12) for exciting an alternating electric field according to the input RF signal, and receiving an electric field disturbance signal, wherein the electric field disturbance signal is an amplitude modulation signal generated by means of the alternating electric field being disturbed by a vibration signal on a skin surface to be detected, and the amplitude of the vibration signal on the skin surface to be detected is modulated onto the alternating electric field; and an amplitude modulation envelope detector (13) for demodulating the vibration signal on the skin surface to be detected from the electric field disturbance signal. The technical problems in the related art of complex measurement and inconvenient use occurring when the physiological activities of tissues are measured are solved.

Description

Signal detector and signal detection method

Technical field

The present invention relates to the field of signal processing, and in particular to a signal detector and a signal detecting method.

Background technique

At present, non-invasive human tissue physiological signal detection has a variety of technical approaches. In the field of cardiovascular parameter detection, piezoelectric signal sensors, electrocardiographic signals (ECG), photoplethysmography (PPG), and Impedance Cardiography (ICG) Doppler shift/phase shift signal sensors have achieved remarkable results, and many related products have been available.

Extracting the physiological and pathological information of the human body from the pulse wave as the basis for clinical diagnosis and treatment has always been valued by the Chinese and foreign medical circles. Studies have shown that measuring pulse waves on human aortic vessels can yield more realistic and effective signals. However, because the aortic blood vessels are buried in the complex skin, fat, muscles, bones and other tissues of the human body, various detection techniques are brought tough challenges.

Piezoelectric signal sensors inevitably require the airbag to apply external pressure to compress the blood vessels to complete the blood pressure measurement. External pressure exerts adverse reactions such as emotional stress and discomfort, which affects the detection accuracy and experience; ECG signal sensor It is necessary to directly attach the metal electrode on the human skin, or at least touch the electrode with both hands; the photoelectric volume pulse wave signal sensor is currently only suitable for capillary measurement of the skin surface, the signal is extremely unstable, and is affected by the skin color; the bioimpedance signal sensor also needs The measuring electrode is attached around the heart; while the signal detected by the Doppler shift/phase shift detection mode is very weak, is susceptible to interference, and requires complicated signal processing, and the detection accuracy is low.

In the related art, when detecting physiological activities of human tissues, the signal input port is generally connected to the human body tissue to be tested, and the input signal and the output signal of the signal output port are measured by the corresponding measuring circuit, thereby obtaining the human body. The tissue physiological activity signal increases the complexity of the measurement circuit because it needs to measure the incident signal and the reflected signal of the antenna input port at the same time.

In the related art, another measurement method is: based on inductance or capacitance sensing, the parasitic capacitance or parasitic inductance generated by the human body changes with the pulse periodic pulse, thereby causing a change in the sensor resonance circuit parameter (resonance frequency). In order to achieve higher detection sensitivity, the resonant circuit is required to have a higher intrinsic quality factor. Due to the high loss and high dielectric properties of human tissue itself, the resonant circuit is susceptible to great influence. The practical use of the sensor brings many difficulties and inconveniences.

Therefore, in the related art, when measuring physiological activities of tissues, there is a problem that measurement is complicated and inconvenient to use.

In response to the above problems, no effective solution has been proposed yet.

Summary of the invention

The embodiment of the invention provides a signal detector and a signal detecting method, so as to at least solve the technical problems in the related art that when measuring the physiological activity of the tissue, the measurement is complicated and the use is inconvenient.

According to an aspect of an embodiment of the present invention, a signal detector includes: a radio frequency RF signal generator for generating an RF signal; and an RF antenna for exciting an alternating electric field according to the input RF signal, and Receiving an electric field disturbance signal; wherein the electric field disturbance signal is an alternating electric field is disturbed by a vibration signal of a surface of the skin to be tested, and an amplitude modulation signal generated by an amplitude of the vibration signal of the skin surface to be measured is modulated to an alternating electric field; amplitude modulation envelope detection And a signal for demodulating the surface of the skin to be tested from the electric field disturbance signal.

Optionally, the signal detector further comprises: an RF output power amplifier for amplifying the RF signal generated by the RF RF signal generator and controlling the output power at -10 dBm to 20 dBm; and an RF output matching circuit for The output impedance of the RF signal is matched to the input impedance of the RF antenna; the RF input matching circuit is configured to perform maximum power transfer of the electric field disturbance signal received from the RF antenna.

Optionally, the signal detector further includes: a first filter, configured to filter out an interference signal outside the working frequency band of the RF signal in the electric field disturbance signal output from the RF input matching circuit; and a second filter, And filtering an interference signal out of a predetermined cutoff frequency of the vibration signal of the skin surface to be tested outputted from the amplitude modulation envelope detector according to a spectral characteristic of the vibration signal of the skin surface to be tested; a signal amplifier, Amplifying the demodulated vibration signal of the surface of the skin to be tested; an analog digital AD converter for converting the demodulated vibration signal of the surface of the skin to be tested into a digital signal; and a data signal processor Processing and displaying the digital signal.

Optionally, the RF antenna is one or more, the RF antenna supports transmission and reception sharing, or supports transmission and reception separation, wherein the RF antenna adopts an unbalanced feed.

Optionally, the RF antenna is fabricated on a flexible circuit board FPC; or the RF antenna is fabricated on a flexible conductive braid, wherein the conductive yarn embroidering process or the conductive woven fabric is cut and pasted to make a close fit. On the clothes.

Optionally, one or more coupling components are added within a predetermined distance around the RF antenna, and matching circuits corresponding to the one or more coupling components are used to change 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 piece, a meander line, a deformation of a rectangular piece, a deformation of a meander line, wherein the coupling part and the RF antenna The spacing between the two is adjustable; the corresponding matching circuit of the one or more coupling components is used to interconnect the corresponding coupling component and the circuit metal ground.

Optionally, the signal detector further includes: an insulating isolation layer disposed between the RF antenna and the surface of the skin to be tested for isolating the air space.

Optionally, the insulating isolation layer is made of medical silica gel, animal leather, and leather.

According to another aspect of the present invention, a signal detecting method is provided, comprising: generating an RF signal by using a radio frequency RF signal generator; exciting an alternating electric field according to the input RF signal by an RF antenna, and receiving an electric field disturbance signal Wherein the electric field disturbance signal is that the alternating electric field is disturbed by the vibration signal of the surface of the skin to be tested, and the amplitude of the vibration signal of the skin surface to be tested is modulated to an amplitude modulation signal generated on the alternating electric field; the amplitude modulation envelope detector is used The vibration signal of the surface of the skin to be tested is demodulated in the electric field disturbance signal.

Optionally, after generating the RF signal by using the RF signal generator, amplifying the RF signal generated by the RF RF signal generator with an RF output power amplifier; and outputting the RF signal by an RF output matching circuit The impedance is matched to the input impedance of the RF antenna; before the vibration signal of the surface of the skin to be tested is demodulated from the electric field disturbance signal by using an amplitude modulation envelope detector, the RF input matching circuit is used to receive the RF antenna The maximum power transmission of the electric field disturbance signal; and using a first filter to filter out an interference signal outside the working frequency band of the RF signal in the electric field disturbance signal output from the RF input matching circuit; using amplitude modulation envelope detection After demodulating the vibration signal of the surface of the skin to be tested from the electric field disturbance signal, the second filter is used to filter out the amplitude modulation envelope detection according to the spectral characteristics of the vibration signal of the skin surface to be tested. An interference signal outside the predetermined cutoff frequency of the vibration signal of the surface of the skin to be tested outputted in the device; the demodulated The skin surface of the vibration signals is amplified; by the analog-digital converter AD demodulated measured skin surface the vibration signal into a digital signal; and a data signal using the digital signal processor for processing and display.

In the embodiment of the present invention, the vibration amplitude of the vibration signal of the skin surface to be tested is modulated to an electric field disturbance signal generated on the alternating electric field, and the vibration signal of the skin surface to be tested is demodulated from the electric field disturbance signal. The purpose of directly measuring the physiological activities of the tissue is achieved, and the technical problems of complicated measurement and inconvenient use are also solved in the related art when measuring the physiological activities of the tissue.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing in:

1 is a schematic structural view of a signal detector according to an embodiment of the present invention;

2 is a schematic diagram of an RF antenna of a wearable detector for detecting surface vibration of a human skin according to a first embodiment of the present invention;

3 is a schematic view of a wearable detector device for detecting surface vibration of a human skin according to a first embodiment of the present invention;

4 is a schematic view showing a result of detecting a skin surface vibration at a radial artery of a human body according to an embodiment of the present invention;

Figure 5 is a schematic illustration of a wearable detector device for detecting surface vibration of a human skin in accordance with a second embodiment of the present invention;

Figure 6 is a flow chart in accordance with a first embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is an embodiment of the invention, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

It is to be understood that the terms "first", "second", and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order. It is to be understood that the data so used may be interchanged where appropriate, so that the embodiments of the invention described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "comprises" and "comprises" and "the" and "the" are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to Those steps or units may include other steps or units not explicitly listed or inherent to such processes, methods, products or devices.

Tissue physiological activities, for example, the superficial arteries of the human body such as the radial artery, the radial artery, the carotid artery, the subclavian artery, etc., usually the arteries are close to the surface of the skin, and the vibration of the blood vessels caused by the pulse wave can be directly transmitted and reflected to The vibration of its adjacent skin surface. A large number of clinical results confirm that the pulse wave exhibits a comprehensive signal of the shape (wave shape), intensity (wave amplitude), velocity (wave velocity) and rhythm (wave cycle). It reflects many of the physiological and pathological features of the human cardiovascular system. Based on this, in the embodiment of the present invention, a signal detector is provided. 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 (Radio Frequency, RF for short) signal generator 11 for generating an RF signal, for example, can be used to generate a continuous wave RF signal, the signal frequency is in the RF antenna resonance frequency band; the RF antenna 12, and the RF signal generated above The device 11 is connected to excite an alternating electric field according to the input RF signal and receive an electric field disturbance signal, wherein the electric field disturbance signal is an alternating electric field disturbed by a vibration signal of a surface of the skin to be tested, and the vibration of the surface of the skin to be tested The amplitude of the signal is modulated to an amplitude modulated signal generated on the alternating electric field; an amplitude modulation envelope detector 13 is coupled to the RF antenna 12 for demodulating the vibration signal of the surface of the skin to be tested from the electric field disturbance signal.

Through the above signal detector, an electric field disturbance signal generated by modulating the amplitude of the vibration signal on the surface of the skin to be measured to the alternating electric field is used, and the vibration signal of the surface of the skin to be tested is demodulated from the electric field disturbance signal to achieve The purpose of directly measuring the physiological activities of the tissue is solved, and in the related art, when measuring the physiological activities of the tissue, there are technical problems of complicated measurement and inconvenient use.

Wherein, the RF antenna can adopt an unbalanced feeding mode and operates in a near-field mode for generating an alternating oscillating electric field in a surface area of a human skin to be tested; the alternating electric field is disturbed by vibration of a human skin surface, thereby The skin surface vibration amplitude is modulated onto the alternating electric field to produce an amplitude modulated electric field disturbance signal. In addition, it should be noted that the RF antenna may also be one or more, and the RF antenna may support transmission and reception sharing, and may also support transmission and reception separation. Therefore, it can be flexibly selected according to specific needs or design requirements.

Optionally, the RF antenna can be preferentially fabricated on a flexible printed circuit (FPC) dielectric substrate, wherein the FPC dielectric substrate has a certain flexibility and can conform to the surface of the human tissue and is freely attached. Hehe.

Optionally, the RF antenna can also be preferentially fabricated on a flexible metal braid, and is formed on the close-fitting clothing by a metal yarn embroidering process or a conductive cloth after cutting and pasting.

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 in the vicinity of the RF antenna to obtain a maximum electric field strength in the target region; usually the predetermined distance is not A quarter wavelength greater than the operating frequency of the RF antenna, wherein the matching circuit is an interconnection between the coupling component and the circuit metal ground.

Optionally, one or more metal structures may be added on both sides of the RF antenna as coupling members, and the metal structure may be a rectangular piece, a meander line or a deformation thereof. Among them, the increased metal structure and the spacing between the antennas are adjustable. It is also possible to adjust the shape and spacing of the coupling components and their interconnection with the circuit metal to adjust the electric field strength and distribution on both sides of the antenna to improve the amplitude modulation effect of the skin surface vibration on the alternating electric field near the antenna.

In order to achieve the simplification of the device, preferably, the signal detector can also be provided with a duplexer, which is connected to the RF antenna for realizing the transceiving and sharing of the RF antenna.

To ensure safety, an insulating isolation layer is disposed between the RF antenna and the surface of the skin to be tested; the RF antenna and the person There is a low dielectric loss, biocompatible insulating barrier between the skin surface.

It should be noted that the material of the insulating isolation layer may be medical silica gel, animal leather, leather. For example, the low dielectric loss insulating isolation layer may be made of medical silica gel, and the medical silicone injection molding the RF antenna through the slotting. Or ridged so that the medium between the barrier layer and the skin surface is air.

Optionally, the insulating isolation layer may be made of animal skin and leather such as cowhide and sheepskin, and the RF antenna is skinned by the animal cortex, and the medium between the separation layer and the skin surface is air. .

In order to make the signal output to the RF antenna suitable, the detector 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.

Additionally, the detector may further include: an RF output matching circuit for matching an output impedance of the RF signal to an input impedance of the RF antenna, for example, an RF signal output by the RF signal source or the RF output power amplifier The output impedance is matched to the input impedance of the RF antenna; the RF input matching circuit is used to perform maximum power transfer to the electric field disturbance signal received from the RF antenna. Achieve as much lossless transmission as possible of the RF signal.

In order to effectively control the interference of the interference signal, the signal detector may further include: a first filter for filtering out the interference signal outside the working frequency band of the continuous wave RF signal.

In order to further avoid the interference of the interference signal, the signal detector may further include: a second filter, configured to select a suitable cutoff frequency according to the spectral characteristics of the surface vibration signal of the human skin, and filter out other interference signals.

After demodulating the vibration signal of the surface of the skin to be tested, in order to effectively implement the effective processing of the vibration signal of the skin surface to be tested, the signal detector further includes: a signal amplifier for demodulating the to-be-tested The vibration signal of the skin surface is amplified; an AD converter for converting the demodulated human skin surface vibration signal into a digital signal; and a digital signal processor for performing subsequent algorithm processing and display on the converted digital signal .

It should be noted that the detector provided by the above embodiment may be a wearable detector for detecting surface vibration of a human skin, which effectively solves the problem that the detector needs airbag pressure and direct skin when detecting the physiological tissue in the related art. Contact, susceptible to interference, low detection accuracy and other technical issues.

In the following, a signal detector is used as a wearable detector for detecting surface vibration of a human skin as an example.

2 is a schematic diagram of an RF antenna of a wearable detector for detecting surface vibration of a human skin according to a first embodiment of the present invention. As shown in FIG. 2, the RF antenna includes:

RF antenna radiator, the RF antenna radiator is a single radiator, using unbalanced feeding to improve the sky The line is coupled to the electric field of the body tissue and contributes to the design of the coupling components around the antenna.

The coupling member 1 and the coupling member 2 are respectively distributed on both sides of the RF antenna radiator; the shape of the coupling member and the indirect adjustment of the RF antenna radiator.

The matching circuit 1 and the matching circuit 2 respectively connect the corresponding coupling components and realize different matching, thereby adjusting the electric field distribution and improving the amplitude modulation effect of the skin surface vibration.

3 is a schematic view of a wearable detector device for detecting surface vibration of a human skin according to a first embodiment of the present invention. As shown in FIG. 3, the detector device includes:

RF antenna 12, which can be fed unbalanced and operates in near field mode.

The RF antenna 12 can be preferentially designed as a flexible antenna to be more easily attached to the human body; optionally, the RF antenna 12 is formed on the flexible FPC dielectric substrate by planar printing; alternatively, the RF antenna 12 is adopted. The conductive yarn embroidering process or the conductive woven fabric is cut and pasted and made on the clothes worn by the body;

a duplexer 38; connected to the RF antenna to implement transceiver sharing of the RF antenna;

An insulating isolation layer 39; a biocompatible insulating isolation layer for a low dielectric loss between the RF antenna and the human skin surface;

Among them, the insulating isolation layer has a low dielectric loss, and the thickness should be as thin as possible, and it is recommended not to exceed 1 mm to reduce the loss of energy propagation in the medium. The insulating insulation layer has good biocompatibility to ensure long-term contact with human skin. The insulating layer also has good mechanical flexibility and can conform well to the skin of various parts of the human body, and should be introduced between the two. The air gap is to ensure that the insulating barrier does not oppress the surface vibration of the skin.

Optionally, the low dielectric loss, biocompatible insulating isolation layer is made of medical silica gel. The medical silicone injection molding RF antenna is used to form a medium between the separation layer and the skin surface by slotting or ribbing. For the air.

Optionally, the low dielectric loss, biocompatible insulating insulation layer is made of animal skin and leather such as cowhide and sheepskin. The RF antenna is skinned by animal leather and is isolated by slotting or ribbing. The medium between the layer and the skin surface is air.

RF signal generator 11; generating a continuous wave RF signal, the signal frequency is within the resonant frequency band of the RF antenna;

RF output power amplifier 36; amplifying the continuous wave RF signal, the output power is limited to -10dBm to 20dBm;

An RF output matching circuit 37; matching the output impedance of the RF output power amplifier to the 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 the next stage circuit in a maximum power matching manner;

a first filter 34; filtering out interference signals outside the working frequency band of the continuous wave RF signal;

An amplitude modulation envelope detector 13; demodulating an amplitude modulated electric field disturbance signal carrying a skin surface vibration signal;

a second filter 33; according to the characteristics of the surface vibration signal of the human skin, selecting a suitable cutoff frequency to filter out other interference signals;

a signal amplifier 32; for amplifying the demodulated vibration signal of the surface of the skin to be tested;

The AD converter and the digital signal processor 31 convert the demodulated human skin surface vibration signal into a digital signal and perform subsequent algorithm processing.

4 is a schematic diagram showing the detection result of the skin surface vibration at the radial artery of the human body according to an embodiment of the present invention. The pulse signal waveform obtained by the wristband type watch test using the 418 MHz detection signal is as shown in FIG. 4, and the test result also shows: The peak amplitude is about 8520000, the trough amplitude is about 8350000, and the pulse wave state is continuous with time. The test results show that the method for detecting surface vibration of human skin according to the embodiment of the present invention can be used and has good results.

5 is a schematic diagram of a wearable detector device for detecting surface vibration of a human skin according to a second embodiment of the present invention. As shown in FIG. 5, this embodiment differs from FIG. 3 in that an amplitude modulation envelope detector is used. 13 is replaced with a mixer 51, and the signal amplifier 32 is omitted. The mixer 51 requires the RF signal generator 11 to provide an RF signal as a local oscillator signal for synchronous demodulation with the received signal after the first filter 34. This method can improve the conversion gain of the demodulation circuit and save the signal amplifier.

According to an embodiment of the present invention, a wearable method for detecting surface vibration of a human skin is provided. The detecting method can be performed by the detecting device of the first embodiment of the present invention. FIG. 6 is a flow chart according to the first embodiment of the present invention. As shown in FIG. 6, the method includes the following steps:

Step S101, placing the RF antenna on a skin surface of the human body having superficial vibration, such as a radial artery, a radial artery, a carotid artery, a subclavian artery, or the like;

Step S102, the RF signal generator generates a continuous wave RF signal, which is amplified by the RF output power amplifier, and connected to the antenna duplexer signal input terminal through the RF output matching circuit; at this time, the alternating oscillation is excited near the antenna. The electric field; the alternating electric field is disturbed by the vibration of the surface of the human skin, thereby modulating the amplitude of the skin surface vibration to the alternating electric field, and generating 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 duplexer output port;

Step S104, filtering the interference signal outside the working frequency band by the first filter, and demodulating the surface vibration signal of the human skin by the amplitude modulation envelope detector;

Step S105, the demodulated human skin surface vibration signal is filtered by the second filter, input to the digital signal processor for subsequent processing by AD conversion.

The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.

In the above-mentioned embodiments of the present invention, the descriptions of the various embodiments are different, and the parts that are not detailed in a certain embodiment can be referred to the related descriptions of other embodiments.

In the several embodiments provided by the present application, it should be understood that the disclosed technical contents may be implemented in other manners. The device embodiments described above are only schematic. For example, the division of cells may be a logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined or integrated into Another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, unit or module, and may be electrical or otherwise.

The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

An integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, can be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server or network device, etc.) to perform all or part of the steps of the various embodiments of the present invention. The foregoing storage medium includes: a U disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk, and the like. .

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

A signal detector comprising:

An RF RF signal generator for generating an RF signal;

An RF antenna for exciting an alternating electric field according to the input RF signal and receiving an electric field disturbance signal; wherein the electric field disturbance signal is an alternating electric field disturbed by a vibration signal of a surface of the skin to be tested, the surface of the skin to be tested The amplitude of the vibration signal is modulated to an amplitude modulated signal generated on the alternating electric field;

An amplitude modulation envelope detector for demodulating a vibration signal of the surface of the skin to be tested from the electric field disturbance signal.
The signal detector of claim 1 further comprising:

An RF output power amplifier for amplifying the RF signal generated by the RF RF signal generator and controlling the output power from -10 dBm to 20 dBm;

An RF output matching circuit for matching an output impedance of the RF signal to an input impedance of the RF antenna;

An RF input matching circuit for performing maximum power transfer of the electric field disturbance signal received from the RF antenna.
The signal detector of claim 1 further comprising:

a first filter, configured to filter out an interference signal outside the working frequency band of the RF signal in the electric field disturbance signal output from the RF input matching circuit;

a second filter, configured to filter interference from a predetermined cutoff frequency of the vibration signal of the surface of the skin to be tested outputted from the amplitude modulation envelope detector according to a spectral characteristic of the vibration signal of the skin surface to be tested signal;

a signal amplifier for amplifying the demodulated vibration signal of the surface of the skin to be tested;

An analog digital AD converter for converting the demodulated vibration signal of the surface of the skin to be tested into a digital signal;

A data signal processor for processing and displaying the digital signal.
The signal detector of claim 1 wherein said RF antennas are one or more, said RF antennas support transmission and reception sharing, or support for transmission and reception separation, wherein said RF antennas employ unbalanced feeds.
The signal detector according to claim 1, wherein

The RF antenna is fabricated on a flexible circuit board FPC;

or,

The RF antenna is fabricated on a flexible conductive braid, wherein the conductive yarn embroidering process or the conductive woven fabric is cut and pasted to form the close-fitting clothing.
The signal detector according to claim 1, wherein

One or more coupling members are added within a predetermined distance around the RF antenna, and matching circuits corresponding to the one or more coupling members are used to change the electric field distribution of the RF antenna.
The signal detector according to claim 6, wherein

The coupling component is a metal structure, and the shape of the coupling component is one of the following: a rectangular piece, a meander line, a deformation of a rectangular piece, and a deformation of a meander line, wherein a spacing between the coupling part and the RF antenna can be Tune

A matching circuit corresponding to the one or more coupling components is used to interconnect the corresponding coupling component and the circuit metal ground.
The signal detector of claim 1 further comprising:

An insulating spacer disposed between the RF antenna and the surface of the skin to be tested for isolating the air gap.
The signal detector according to claim 8, wherein the insulating isolation layer is made of medical silica gel, animal leather, and leather.
A signal detection method includes:

Generating an RF signal using an RF RF signal generator;

The alternating electric field is excited by the RF antenna according to the input RF signal, and receives an electric field disturbance signal; wherein the electric field disturbance signal is an alternating electric field disturbed by a vibration signal of a surface of the skin to be tested, and the vibration of the surface of the skin to be tested The signal amplitude is modulated to an amplitude modulated signal generated on an alternating electric field;

An amplitude modulation envelope detector is used to demodulate the vibration signal of the surface of the skin to be tested from the electric field disturbance signal.
The signal detecting method according to claim 10, wherein

After generating the RF signal by using the RF signal generator, amplifying the RF signal generated by the RF RF signal generator with an RF output power amplifier; and matching the output impedance of the RF signal to the RF by an RF output matching circuit The input impedance of the antenna;

Performing on the electric field disturbance signal received from the RF antenna by using an RF input matching circuit before demodulating the vibration signal of the skin surface to be tested from the electric field disturbance signal by using the amplitude modulation envelope detector a maximum power transmission; and a first filter is used to filter out an interference signal outside the operating frequency band of the RF signal in the electric field disturbance signal output from the RF input matching circuit;

After demodulating the vibration signal of the surface of the skin to be tested from the electric field disturbance signal by using an amplitude modulation envelope detector, filtering the signal according to the spectral characteristics of the vibration signal of the skin surface to be tested by using a second filter An interference signal outside the predetermined cutoff frequency of the vibration signal of the skin surface to be tested outputted in the amplitude modulation envelope detector; the demodulated vibration signal of the surface of the skin to be tested is amplified by a signal amplifier; An analog digital AD converter converts the demodulated vibration signal of the surface of the skin to be tested into a digital signal; and processes and displays the digital signal with a data signal processor.