CN104749438B - A kind of differential type impedance spectrum detecting system and method - Google Patents
A kind of differential type impedance spectrum detecting system and method Download PDFInfo
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Abstract
The invention discloses a kind of differential type impedance spectrum detecting system, including impedance spectrum detection chip, pumping signal amplification conditioning module, the first sensor for gathering sample impedance spectrum information, collection signal amplification conditioning module, in addition to：For providing second sensor, the first buffer chip, the second buffer chip and the signal differential module of reference impedance spectrum information for the first sensor.By using binary channels, use the first sensor for gathering sample impedance spectrum information and the second sensor for providing reference impedance spectrum information for the first sensor, and signal differential module, therefore in detection process, only extract first sensor and the different information of second sensor is amplified and nursed one's health, the influence brought due to the basal signal of sensor is reduced, so as to improve the sensitivity of detection.Invention additionally discloses a kind of differential type impedance spectrum detection method.
Description
Technical field
The present invention relates to impedance spectrum technical field, more particularly to a kind of differential type impedance spectrum detecting system and method.
Background technology
Impedance spectral technology is as a kind of non-intrusive, quick detection technique in electrochemistry, bio-impedance, corrosion monitoring, nothing
The field such as damage detection and material analysis plays a significant role.Its purpose detected is to obtain faint dielectric between different material
The dielectric change information of difference or same substance, and according to these information to the composition of detection object, structure and its variation characteristic
Carry out analysis discussion.Common impedance spectrum measuring method includes：Bridge method, the resonance method, voltage x current method, radio-frequency voltage electric current
Method, self-balancing bridge method and Network Analysis Method etc..
Fig. 1 is the structure chart of the impedance spectrum detecting system of prior art.The system includes impedance spectrum detection chip 10, excitation
Signal-regulated kinase 11, sensor 12, collection Signal-regulated kinase 13.
But the above method is realized in the form of single channel is measured directly, cause the dielectric between acquisition dielectric material poor
XOR dielectric change information is vulnerable to sensor base signal, and (the plane interdigital capacitor such as using polytetrafluoroethylene (PTFE) as substrate senses
Device) etc. influence.
Therefore, the influence of basal signal how is reduced, is ability so as to improve the detection sensitivity of impedance spectrum detection method
Field technique personnel's urgent problem to be solved.
The content of the invention
It is used for the influence for reducing basal signal it is an object of the invention to provide a kind of differential type impedance spectrum detecting system, so as to
Improve the detection sensitivity of impedance spectrum detection method.In addition, the purpose of the present invention also provides a kind of differential type impedance spectrum detection side
Method.
In order to solve the above technical problems, the present invention provides a kind of differential type impedance spectrum detecting system, including impedance spectrum detection
Chip, pumping signal amplification conditioning module, the first sensor for gathering sample impedance spectrum information, collection signal amplification conditioning
Module, in addition to：For provided for the first sensor second sensor of reference impedance spectrum information, the first buffer chip,
Second buffer chip and signal differential module；
Wherein, the impedance spectrum detection chip is adjusted with pumping signal amplification conditioning module and the collection signal amplification
Module connection is managed, for producing pumping signal, and the output signal obtained to the collection signal amplification conditioning module hinders
Anti- spectrum dissection process；
Pumping signal amplification conditioning module is connected with the first sensor and the second sensor, for by institute
Pumping signal amplification is stated, nurses one's health and transmits to the first sensor and the second sensor；
The first sensor is connected with first buffer chip, for the signal of the first sensor to be delayed
Punching, the second sensor is connected with second buffer chip, for the signal of the second sensor to be entered into row buffering；
The signal differential module is connected with first buffer chip and second buffer chip, for believing response
Number difference processing, the response signal is the first sensor and the second sensor be energized after caused by signal；
The collection signal amplification conditioning module is connected with the signal differential module, for the response after difference processing
Signal is amplified and nursed one's health to obtain output signal.
Preferably, the impedance spectrum detection chip is specially AD5933 impedance spectrum detection chips.
Preferably, the signal differential module is specially variable gain amplifier LMH6503.
Preferably, the pumping signal amplification conditioning module specifically includes MAX532 chips, and the collection signal amplification is adjusted
Reason module specifically includes MAX532 chips and operational amplifier OP37, first buffer chip and second buffer chip tool
Body includes MAX4203 buffer chips.
Preferably, in addition to：Single-chip microcomputer and mobile terminal；
Wherein, the single-chip microcomputer communicates with the impedance spectrum detection chip, for obtaining the impedance spectrum detection chip
Impedance spectrum dissection process result, and send acquisition instructions to the impedance spectrum detection chip；
The mobile terminal and the single chip communication, at the impedance spectrum parsing for showing the impedance spectrum detection chip
Manage result.
A kind of differential type impedance spectrum detection method, including pumping signal is produced, in addition to：
The pumping signal is amplified, nursed one's health and transmitted to first sensor and second sensor；
The reference signal of collection signal and the second sensor to the first sensor enters row buffering；
Response signal is produced, the response signal is to be produced after the first sensor and the second sensor are energized
Signal；
To the response signal difference processing；
Response signal after difference processing is amplified and nursed one's health to obtain output signal；
Impedance spectrum dissection process is carried out to the output signal.
Preferably, the generation pumping signal is specially：
Pumping signal is produced by AD5933 impedance spectrums detection chip.
Preferably, it is described to be specially to the response signal difference processing：
By variable gain amplifier LMH6503 to the response signal difference processing.
Preferably, it is described that the pumping signal is amplified, nursed one's health and transmitted specific to first sensor and second sensor
For：
The pumping signal is amplified, nursed one's health and transmitted to first sensor and second sensor by MAX532 chips；
It is described that to enter row buffering to the collection signal of the first sensor and the reference signal of the second sensor specific
For：
Row buffering is entered to the collection signal by the first buffer chip MAX4203, passes through the second buffer chip MAX4203
Row buffering is entered to the reference signal；
The response signal to after difference processing is amplified and nursed one's health：
By MAX532 chips and operational amplifier OP37 the response signal after difference processing is amplified and nursed one's health with
Obtain output signal.
Preferably, in addition to：
The result of the impedance spectrum dissection process is obtained, and sends acquisition instructions；
Show the result of the impedance spectrum dissection process.
Differential type impedance spectrum detecting system provided by the present invention, by using binary channels, i.e., using for gathering sample
The first sensor of impedance spectrum information and the second sensor for providing reference impedance spectrum information for the first sensor, with
And signal differential module, therefore in detection process, only extract first sensor and the different information of second sensor is put
Big and conditioning, reduces the influence brought due to the basal signal of sensor, so as to improve the sensitivity of detection.
Brief description of the drawings
In order to illustrate the embodiments of the present invention more clearly, the required accompanying drawing used in embodiment will be done simply below
Introduce, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ordinary skill people
For member, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structure chart of the impedance spectrum detecting system of prior art；
Fig. 2 is a kind of structure chart of differential type impedance spectrum detecting system provided by the invention；
Fig. 3 is the structure chart of another differential type impedance spectrum detecting system provided by the invention；
Fig. 4 is a kind of flow chart of differential type impedance spectrum detection method provided by the invention；
Fig. 5 is the flow chart of another differential type impedance spectrum detection method provided by the invention；
Fig. 6 is the impedance spectrum testing result and differential type impedance spectrum testing result of a kind of prior art provided by the invention
Comparison diagram；
Fig. 7 is the impedance spectrum testing result and differential type impedance spectrum testing result of another prior art provided by the invention
Comparison diagram；
Fig. 8 is the impedance spectrum testing result and differential type impedance spectrum testing result of another prior art provided by the invention
Comparison diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, for those of ordinary skill in the art under the premise of creative work is not made, what is obtained is every other
Embodiment, belong to the scope of the present invention.
The core of the present invention is to provide a kind of differential type impedance spectrum detecting system and method.
In order that those skilled in the art more fully understand the present invention program, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
Embodiment one
Fig. 2 is a kind of structure chart of differential type impedance spectrum detecting system provided by the invention.Differential type impedance spectrum detection system
System, including impedance spectrum detection chip 20, pumping signal amplification conditioning module 21, the first biography for gathering sample impedance spectrum information
Sensor 22, collection signal amplification conditioning module 23, the second sensor for providing reference impedance spectrum information for first sensor
24th, the first buffer chip 25, the second buffer chip 26 and signal differential module 27.
In specific implementation, when needing detection, impedance spectrum detection chip 20 produces pumping signal, and pumping signal is passed
Transport to connected pumping signal amplification conditioning module 21, pumping signal amplify conditioning module 21 to pumping signal amplification and
Conditioning, so as to the purpose for reaching digital dynamic regulation excitation signal amplitude, expanding detection range, and will be sharp after amplification and conditioning
Signal is encouraged to transmit to first sensor 22 and second sensor 24.First sensor 22 is used for the impedance spectrum information for gathering sample,
Second sensor 24 is used to provide reference impedance spectrum information for the first sensor.First buffer chip 25 and first sensor
22 connections, enter row buffering by the collection signal of first sensor 22, and the second buffer chip 26 is connected with second sensor 24, by the
The reference signal of two sensors 24 enters row buffering.Signal differential module 27 connects with the first buffer chip 25 and the second buffer chip 26
Connect, response signal caused by after first sensor 22 and second sensor 24 are energized carries out difference processing.Collection signal is put
Big conditioning module 23 is connected with signal differential module 27, the response signal after difference processing is amplified and nursed one's health be defeated to obtain
Go out signal, so as to meet the requirement of impedance spectrum detection chip 20.Impedance spectrum detection chip 20 also nurses one's health mould with collection signal amplification
Block 23 connects, and carries out impedance spectrum dissection process to the output signal of collection signal amplification conditioning module 23, obtains the impedance of sample
Spectrum information.
The differential type impedance spectrum detecting system that the present embodiment provides, by using binary channels, i.e., using for gathering sample
The first sensor of impedance spectrum information and the second sensor for providing reference impedance spectrum information for the first sensor, with
And signal differential module, therefore in detection process, only extract first sensor and the different information of second sensor is put
Big and conditioning, the influence come due to the base strap of sensor is reduced, so as to improve the sensitivity of detection.
It should be noted that first sensor and the particular type of second sensor are not particularly limited in the present embodiment,
It can be capacitance sensor.
As a preferred embodiment, the impedance spectrum detection chip is specially AD5933 impedance spectrum detection chips.
Fig. 3 is the structure chart of another differential type impedance spectrum detecting system provided by the invention.Impedance spectrum detection chip 20
Specially AD5933 impedance spectrums detection chip.
As a preferred embodiment, the signal differential module is specially variable gain amplifier LMH6503.
As shown in figure 3, signal differential module 27 is variable gain amplifier LMH6503.
As a preferred embodiment, the pumping signal amplification conditioning module specifically includes MAX532 chips, institute
State collection signal amplification conditioning module and specifically include MAX532 chips and operational amplifier OP37, first buffer chip and institute
State the second buffer chip and specifically include MAX4203 buffer chips.
As shown in figure 3, pumping signal amplification conditioning module 21 specifically includes MAX532 chips, for pumping signal to be put
Greatly, nurse one's health and transmit to first sensor 22 and second sensor 24.Collection signal amplification conditioning module 23 specifically includes
MAX532 chips and operational amplifier OP37, wherein, operational amplifier OP37 mainly carries out direct current biasing to signal, to meet
The input requirements of AD5933 impedance spectrum detection chips.First buffer chip 25 and the second buffer chip 26 specifically include MAX4203
Buffer chip.
It should be noted that it is to illustrate two that the first buffer chip and the second buffer chip why are distinguished in the present invention
The annexation of person and first sensor and second sensor, the two can be identical chip or different chips.
As a preferred embodiment, also include：Single-chip microcomputer and mobile terminal；
Wherein, the single-chip microcomputer communicates with the impedance spectrum detection chip, for obtaining the impedance spectrum detection chip
Impedance spectrum dissection process result, and send acquisition instructions to the impedance spectrum detection chip；
The mobile terminal and the single chip communication, at the impedance spectrum parsing for showing the impedance spectrum detection chip
Manage result.
As shown in figure 3, in specific implementation, although the impedance spectrum detection of the complete paired samples of the energy of impedance spectrum detection chip 20,
But for the integrality of system, single-chip microcomputer 30 and mobile terminal 31 can be increased on the basis of above-described embodiment.Single-chip microcomputer
30 can obtain the impedance spectrum dissection process result of impedance spectrum detection chip 20, can also send and adopt to impedance spectrum detection chip 20
Collection instruction.Mobile terminal 31 communicates with single-chip microcomputer 30, can show the impedance spectrum dissection process of the impedance spectrum detection chip 20
As a result.
It should be noted that single-chip microcomputer can use LPC175X chips, core is detected by I/O communication interfaces and impedance spectrum
Piece communicates, and mobile terminal can pass through RS232 and single chip communication.
Embodiment two
Fig. 4 is a kind of flow chart of differential type impedance spectrum detection method provided by the invention.Differential type impedance spectrum detection side
Method, including：
S40：Produce pumping signal.
S41：The pumping signal is amplified, nursed one's health and transmitted to first sensor and second sensor.
S42：The reference signal of collection signal and the second sensor to the first sensor enters row buffering.
S43：Response signal is produced, the response signal is after the first sensor and the second sensor are energized
Caused signal.
S44：To the response signal difference processing.
S45：Response signal after difference processing is amplified and nursed one's health to obtain output signal.
S46：Impedance spectrum dissection process is carried out to the output signal.
Because above-mentioned differential type impedance spectrum detection method and the differential type impedance spectrum detecting system in embodiment one are relative
Answer, specific descriptions refer to embodiment one.
As a preferred embodiment, the generation pumping signal is specially：
Pumping signal is produced by AD5933 impedance spectrums detection chip.
As a preferred embodiment, described be specially to the response signal difference processing：
By variable gain amplifier LMH6503 to the response signal difference processing.
As a preferred embodiment, described amplify the pumping signal, nurse one's health and transmit to first sensor
It is specially with second sensor：
The pumping signal is amplified, nursed one's health and transmitted to first sensor and second sensor by MAX532 chips；
It is described that to enter row buffering to the collection signal of the first sensor and the reference signal of the second sensor specific
For：
Row buffering is entered to the collection signal by the first buffer chip MAX4203, passes through the second buffer chip MAX4203
Row buffering is entered to the reference signal；
The response signal to after difference processing is amplified and nursed one's health：
By MAX532 chips and operational amplifier OP37 the response signal after difference processing is amplified and nursed one's health with
Obtain output signal.
Fig. 5 is the flow chart of another differential type impedance spectrum detection method provided by the invention.Differential type impedance spectrum detects
Method, in addition to：
S50：The result of the impedance spectrum dissection process is obtained, and sends acquisition instructions.
S51：Show the result of the impedance spectrum dissection process.
Because above-mentioned preferred embodiment is corresponding with the preferred embodiment in embodiment one, specific descriptions refer to
Embodiment one.
Fig. 6 is the impedance spectrum testing result and differential type impedance spectrum testing result of a kind of prior art provided by the invention
Comparison diagram.As shown in fig. 6, using 200mV as basal signal, pumping signal variable quantity is the knot for the response signal that 0-100mV is obtained
Fruit.Wherein, transverse axis is frequency, and the longitudinal axis is the value of real part of impedance response signal, and dotted line represents to use differential type impedance spectrum detection side
The result that method obtains, solid line represent the result obtained using single channel method, and direction shown in arrow is pumping signal variable quantity from 0
The response signal change direction obtained to 100mV.
Fig. 7 is the impedance spectrum testing result and differential type impedance spectrum testing result of another prior art provided by the invention
Comparison diagram.As shown in fig. 7, using 400mV as basal signal, pumping signal variable quantity is the response signal that 0-100mV is obtained
As a result.Wherein, transverse axis is frequency, and the longitudinal axis is the value of real part of impedance response signal, and dotted line represents to detect using differential type impedance spectrum
The result that method obtains, solid line represent the result obtained using single channel method, and direction shown in arrow is pumping signal variable quantity
The response signal change direction obtained from 0 to 100mV.
Fig. 8 is the impedance spectrum testing result and differential type impedance spectrum testing result of another prior art provided by the invention
Comparison diagram.As shown in figure 8, using 1000mV as basal signal, pumping signal variable quantity is the response signal that 0-100mV is obtained
As a result.Wherein, transverse axis is frequency, and the longitudinal axis is the value of real part of impedance response signal, and dotted line represents to detect using differential type impedance spectrum
The result that method obtains, solid line represent the result obtained using single channel method, and direction shown in arrow is pumping signal variable quantity
The response signal change direction obtained from 0 to 100mV.
It can be drawn by Fig. 6-8, under same substrate, response signal changes with the increase of signal incrementss in regular,
And during different basal signal, the variable quantity of the response signal obtained using differential type impedance spectrum detection method is basically identical, i.e.,
Differential type impedance spectrum detection method is not influenceed by basal signal or influenceed by basal signal smaller.Therefore, differential type hinders
Anti- spectrum detection method can improve the sensitivity of detection.
Differential type impedance spectrum detecting system provided by the present invention and method are described in detail above.Herein should
The principle and embodiment of the present invention are set forth with specific case, the explanation of above example is only intended to help and managed
Solve the method and its core concept of the present invention.It should be pointed out that for those skilled in the art, do not departing from
On the premise of the principle of the invention, some improvement and modification can also be carried out to the present invention, these are improved and modification also falls into this hair
In bright scope of the claims.
Claims (5)
1. a kind of differential type impedance spectrum detecting system, including impedance spectrum detection chip, pumping signal amplify conditioning module, for adopting
Collect first sensor, the collection signal amplification conditioning module of sample impedance spectrum information, it is characterised in that also include：For for institute
State second sensor, the first buffer chip, the second buffer chip and signal difference that first sensor provides reference impedance spectrum information
Sub-module；
Wherein, the impedance spectrum detection chip and pumping signal amplification conditioning module and the collection signal amplification conditioning mould
Block connects, and for producing pumping signal, and the output signal obtained to the collection signal amplification conditioning module carries out impedance spectrum
Dissection process；
The pumping signal amplification conditioning module is connected with the first sensor and the second sensor, for swashing described
Signal amplification is encouraged, nurses one's health and transmits to the first sensor and the second sensor；
The first sensor is connected with first buffer chip, for the signal of the first sensor to be entered into row buffering,
The second sensor is connected with second buffer chip, for the signal of the second sensor to be entered into row buffering；
The signal differential module is connected with first buffer chip and second buffer chip, for poor to response signal
Office is managed, and the response signal is that the first sensor and the second sensor are energized rear caused signal；
The collection signal amplification conditioning module is connected with the signal differential module, for the response signal after difference processing
It is amplified and nurses one's health obtains output signal.
2. differential type impedance spectrum detecting system according to claim 1, it is characterised in that the impedance spectrum detection chip tool
Body is AD5933 impedance spectrum detection chips.
3. differential type impedance spectrum detecting system according to claim 1, it is characterised in that the signal differential module is specific
For variable gain amplifier LMH6503.
4. differential type impedance spectrum detecting system according to claim 1, it is characterised in that the pumping signal amplification conditioning
Module specifically includes MAX532 chips, and the collection signal amplification conditioning module specifically includes MAX532 chips and operational amplifier
OP37, first buffer chip and second buffer chip specifically include MAX4203 buffer chips.
5. differential type impedance spectrum detecting system according to claim 1, it is characterised in that also include：Single-chip microcomputer and movement
Terminal；
Wherein, the single-chip microcomputer communicates with the impedance spectrum detection chip, for obtaining the impedance of the impedance spectrum detection chip
Dissection process result is composed, and acquisition instructions are sent to the impedance spectrum detection chip；
The mobile terminal and the single chip communication, for showing the impedance spectrum dissection process knot of the impedance spectrum detection chip
Fruit.
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