CN104749438B - A kind of differential type impedance spectrum detecting system and method - Google Patents
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Abstract
本发明公开了一种差分式阻抗谱检测系统，包括阻抗谱检测芯片、激励信号放大调理模块、用于采集样品阻抗谱信息的第一传感器、采集信号放大调理模块，还包括：用于为所述第一传感器提供参考阻抗谱信息的第二传感器、第一缓冲芯片、第二缓冲芯片和信号差分模块。通过采用双通道，即采用用于采集样品阻抗谱信息的第一传感器和用于为所述第一传感器提供参考阻抗谱信息的第二传感器，以及信号差分模块，因此在检测过程中，仅提取第一传感器和第二传感器的差异信息进行放大和调理，降低了由于传感器的基底信号带来的影响，从而提高了检测的灵敏度。本发明还公开一种差分式阻抗谱检测方法。
The invention discloses a differential impedance spectrum detection system, which includes an impedance spectrum detection chip, an excitation signal amplification and conditioning module, a first sensor for collecting sample impedance spectrum information, and a collection signal amplification and conditioning module. The first sensor provides a second sensor for reference impedance spectrum information, a first buffer chip, a second buffer chip and a signal differential module. By adopting dual channels, that is, using a first sensor for collecting sample impedance spectrum information and a second sensor for providing reference impedance spectrum information for the first sensor, as well as a signal difference module, during the detection process, only The difference information between the first sensor and the second sensor is amplified and adjusted to reduce the influence caused by the base signal of the sensor, thereby improving the detection sensitivity. The invention also discloses a differential impedance spectrum detection method.
Description
技术领域technical field
本发明涉及阻抗谱技术领域，特别是涉及一种差分式阻抗谱检测系统及方法。The invention relates to the technical field of impedance spectroscopy, in particular to a differential impedance spectroscopy detection system and method.
背景技术Background technique
阻抗谱技术作为一种非入侵、快速的检测技术在电化学、生物阻抗、腐蚀监测、无损检测和材料分析等领域发挥重要作用。其检测的目的在于获取不同物质之间微弱的介电差异或同一物质的介电变化信息，并根据这些信息对检测对象的组成、结构及其变化特征进行分析探讨。常见的阻抗谱测量方法包括：电桥法、谐振法、电压电流法、射频电压电流法、自平衡电桥法和网络分析法等。As a non-invasive and rapid detection technique, impedance spectroscopy plays an important role in the fields of electrochemistry, bioimpedance, corrosion monitoring, nondestructive testing and material analysis. The purpose of its detection is to obtain the weak dielectric difference between different substances or the dielectric change information of the same substance, and analyze and discuss the composition, structure and change characteristics of the detection object according to these information. Common impedance spectrum measurement methods include: bridge method, resonance method, voltage current method, radio frequency voltage current method, self-balancing bridge method and network analysis method, etc.
图1为现有技术的阻抗谱检测系统的结构图。该系统包括阻抗谱检测芯片10、激励信号调理模块11、传感器12、采集信号调理模块13。FIG. 1 is a structural diagram of an impedance spectrum detection system in the prior art. The system includes an impedance spectrum detection chip 10 , an excitation signal conditioning module 11 , a sensor 12 , and an acquisition signal conditioning module 13 .
但上述方法均是以单通道直接测量的形式实现，导致获取介电物质之间的介电差异或介电变化信息易受到传感器基底信号(如以聚四氟乙烯为基底的平面叉指电容传感器)等的影响。However, the above-mentioned methods are all implemented in the form of single-channel direct measurement, resulting in the acquisition of dielectric difference or dielectric change information between dielectric substances, which is easily affected by the signal of the sensor substrate (such as a planar interdigitated capacitive sensor based on polytetrafluoroethylene). ) and so on.
因此，如何降低基底信号的影响，从而提高阻抗谱检测方法的检测灵敏度是本领域技术人员亟待解决的问题。Therefore, how to reduce the influence of the substrate signal so as to improve the detection sensitivity of the impedance spectroscopy detection method is an urgent problem to be solved by those skilled in the art.
发明内容Contents of the invention
本发明的目的是提供一种差分式阻抗谱检测系统用于降低基底信号的影响，从而提高阻抗谱检测方法的检测灵敏度。此外，本发明的目的还提供一种差分式阻抗谱检测方法。The purpose of the present invention is to provide a differential impedance spectrum detection system for reducing the influence of the substrate signal, thereby improving the detection sensitivity of the impedance spectrum detection method. In addition, the object of the present invention is also to provide a differential impedance spectrum detection method.
为解决上述技术问题，本发明提供一种差分式阻抗谱检测系统，包括阻抗谱检测芯片、激励信号放大调理模块、用于采集样品阻抗谱信息的第一传感器、采集信号放大调理模块，还包括：用于为所述第一传感器提供参考阻抗谱信息的第二传感器、第一缓冲芯片、第二缓冲芯片和信号差分模块；In order to solve the above technical problems, the present invention provides a differential impedance spectrum detection system, which includes an impedance spectrum detection chip, an excitation signal amplification and conditioning module, a first sensor for collecting sample impedance spectrum information, and an acquisition signal amplification and conditioning module. : a second sensor, a first buffer chip, a second buffer chip and a signal differential module for providing reference impedance spectrum information for the first sensor;
其中，所述阻抗谱检测芯片与所述激励信号放大调理模块和所述采集信号放大调理模块连接，用于产生激励信号，并对所述采集信号放大调理模块获取的输出信号进行阻抗谱解析处理；Wherein, the impedance spectrum detection chip is connected to the excitation signal amplification and conditioning module and the acquisition signal amplification and conditioning module to generate an excitation signal, and perform impedance spectrum analysis processing on the output signal obtained by the acquisition signal amplification and conditioning module ;
所述激励信号放大调理模块与所述第一传感器和所述第二传感器连接，用于将所述激励信号放大、调理并传输至所述第一传感器和所述第二传感器；The excitation signal amplification and conditioning module is connected to the first sensor and the second sensor, and is used to amplify, condition and transmit the excitation signal to the first sensor and the second sensor;
所述第一传感器与所述第一缓冲芯片连接，用于将所述第一传感器的信号进行缓冲，所述第二传感器与所述第二缓冲芯片连接，用于将所述第二传感器的信号进行缓冲；The first sensor is connected to the first buffer chip for buffering the signal of the first sensor, and the second sensor is connected to the second buffer chip for buffering the signal of the second sensor The signal is buffered;
所述信号差分模块与所述第一缓冲芯片和所述第二缓冲芯片连接，用于对响应信号差分处理，所述响应信号为所述第一传感器和所述第二传感器被激励后产生的信号；The signal difference module is connected with the first buffer chip and the second buffer chip, and is used for differential processing of the response signal, the response signal is generated after the first sensor and the second sensor are excited Signal;
所述采集信号放大调理模块与所述信号差分模块连接，用于对差分处理后的响应信号进行放大和调理以获取输出信号。The acquisition signal amplification and conditioning module is connected to the signal difference module, and is used for amplifying and conditioning the differentially processed response signal to obtain an output signal.
优选的，所述阻抗谱检测芯片具体为AD5933阻抗谱检测芯片。Preferably, the impedance spectrum detection chip is specifically an AD5933 impedance spectrum detection chip.
优选的，所述信号差分模块具体为可变增益放大器LMH6503。Preferably, the signal difference module is specifically a variable gain amplifier LMH6503.
优选的，所述激励信号放大调理模块具体包括MAX532芯片，所述采集信号放大调理模块具体包括MAX532芯片和运算放大器OP37，所述第一缓冲芯片和所述第二缓冲芯片具体包括MAX4203缓冲芯片。Preferably, the excitation signal amplification and conditioning module specifically includes a MAX532 chip, the acquisition signal amplification and conditioning module specifically includes a MAX532 chip and an operational amplifier OP37, and the first buffer chip and the second buffer chip specifically include a MAX4203 buffer chip.
优选的，还包括：单片机和移动终端；Preferably, it also includes: a single-chip microcomputer and a mobile terminal;
其中，所述单片机与所述阻抗谱检测芯片通信，用于获取所述阻抗谱检测芯片的阻抗谱解析处理结果，以及向所述阻抗谱检测芯片发送采集指令；Wherein, the single-chip microcomputer communicates with the impedance spectrum detection chip, and is used to obtain the impedance spectrum analysis processing result of the impedance spectrum detection chip, and send an acquisition instruction to the impedance spectrum detection chip;
所述移动终端与所述单片机通信，用于显示所述阻抗谱检测芯片的阻抗谱解析处理结果。The mobile terminal communicates with the single-chip microcomputer, and is used to display the impedance spectrum analysis processing result of the impedance spectrum detection chip.
一种差分式阻抗谱检测方法，包括产生激励信号，还包括：A differential impedance spectrum detection method, comprising generating an excitation signal, further comprising:
将所述激励信号放大、调理并传输至第一传感器和第二传感器；amplifying, conditioning and transmitting the excitation signal to the first sensor and the second sensor;
对所述第一传感器的采集信号和所述第二传感器的参考信号进行缓冲；Buffering the acquisition signal of the first sensor and the reference signal of the second sensor;
产生响应信号，所述响应信号为所述第一传感器和所述第二传感器被激励后产生的信号；generating a response signal, where the response signal is a signal generated after the first sensor and the second sensor are excited;
对所述响应信号差分处理；differentially processing the response signal;
对差分处理后的响应信号进行放大和调理以获取输出信号；Amplifying and conditioning the differentially processed response signal to obtain an output signal;
对所述输出信号进行阻抗谱解析处理。Impedance spectrum analysis processing is performed on the output signal.
优选的，所述产生激励信号具体为：Preferably, said generating the excitation signal is specifically:
通过AD5933阻抗谱检测芯片产生激励信号。The excitation signal is generated by the AD5933 impedance spectrum detection chip.
优选的，所述对所述响应信号差分处理具体为：Preferably, the differential processing of the response signal is specifically:
通过可变增益放大器LMH6503对所述响应信号差分处理。The response signal is differentially processed by a variable gain amplifier LMH6503.
优选的，所述将所述激励信号放大、调理并传输至第一传感器和第二传感器具体为：Preferably, the amplifying, conditioning and transmitting the excitation signal to the first sensor and the second sensor is specifically:
通过MAX532芯片将所述激励信号放大、调理并传输至第一传感器和第二传感器；The excitation signal is amplified, conditioned and transmitted to the first sensor and the second sensor through the MAX532 chip;
所述对所述第一传感器的采集信号和所述第二传感器的参考信号进行缓冲具体为：The buffering of the acquisition signal of the first sensor and the reference signal of the second sensor is specifically:
通过第一缓冲芯片MAX4203对所述采集信号进行缓冲，通过第二缓冲芯片MAX4203对所述参考信号进行缓冲；The first buffer chip MAX4203 is used to buffer the acquisition signal, and the second buffer chip MAX4203 is used to buffer the reference signal;
所述对差分处理后的响应信号进行放大和调理以获取输出信号具体为：The step of amplifying and conditioning the differentially processed response signal to obtain the output signal is specifically:
通过MAX532芯片和运算放大器OP37对差分处理后的响应信号进行放大和调理以获取输出信号。Through the MAX532 chip and the operational amplifier OP37, the response signal after differential processing is amplified and conditioned to obtain the output signal.
优选的，还包括：Preferably, it also includes:
获取所述阻抗谱解析处理的结果，以及发送采集指令；Acquiring the result of the analysis and processing of the impedance spectrum, and sending an acquisition instruction;
显示所述阻抗谱解析处理的结果。The results of the impedance spectrum analysis processing described above are displayed.
本发明所提供的差分式阻抗谱检测系统，通过采用双通道，即采用用于采集样品阻抗谱信息的第一传感器和用于为所述第一传感器提供参考阻抗谱信息的第二传感器，以及信号差分模块，因此在检测过程中，仅提取第一传感器和第二传感器的差异信息进行放大和调理，降低了由于传感器的基底信号带来的影响，从而提高了检测的灵敏度。The differential impedance spectrum detection system provided by the present invention adopts dual channels, that is, a first sensor for collecting sample impedance spectrum information and a second sensor for providing reference impedance spectrum information for the first sensor, and Signal difference module, so in the detection process, only the difference information between the first sensor and the second sensor is extracted for amplification and conditioning, which reduces the influence of the sensor's base signal, thereby improving the detection sensitivity.
附图说明Description of drawings
为了更清楚地说明本发明实施例，下面将对实施例中所需要使用的附图做简单的介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to illustrate the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. As far as people are concerned, other drawings can also be obtained based on these drawings on the premise of not paying creative work.
图1为现有技术的阻抗谱检测系统的结构图；Fig. 1 is the structural diagram of the impedance spectrum detection system of prior art;
图2为本发明提供的一种差分式阻抗谱检测系统的结构图；Fig. 2 is a structural diagram of a differential impedance spectroscopy detection system provided by the present invention;
图3为本发明提供的另一种差分式阻抗谱检测系统的结构图；FIG. 3 is a structural diagram of another differential impedance spectroscopy detection system provided by the present invention;
图4为本发明提供的一种差分式阻抗谱检测方法的流程图；Fig. 4 is a flow chart of a differential impedance spectrum detection method provided by the present invention;
图5为本发明提供的另一种差分式阻抗谱检测方法的流程图；5 is a flow chart of another differential impedance spectroscopy detection method provided by the present invention;
图6为本发明提供的一种现有技术的阻抗谱检测结果和差分式阻抗谱检测结果的对比图；Fig. 6 is a comparison chart of the detection results of impedance spectroscopy and differential impedance spectroscopy detection results of a prior art provided by the present invention;
图7为本发明提供的另一种现有技术的阻抗谱检测结果和差分式阻抗谱检测结果的对比图；FIG. 7 is a comparison diagram between another prior art impedance spectrum detection result and a differential impedance spectrum detection result provided by the present invention;
图8为本发明提供的另一种现有技术的阻抗谱检测结果和差分式阻抗谱检测结果的对比图。FIG. 8 is a comparison diagram between the impedance spectrum detection results of another prior art and the differential impedance spectrum detection results provided by the present invention.
具体实施方式detailed description
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下，所获得的所有其他实施例，都属于本发明保护范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
本发明的核心是提供一种差分式阻抗谱检测系统及方法。The core of the present invention is to provide a differential impedance spectrum detection system and method.
为了使本技术领域的人员更好地理解本发明方案，下面结合附图和具体实施方式对本发明作进一步的详细说明。In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
实施例一Embodiment one
图2为本发明提供的一种差分式阻抗谱检测系统的结构图。差分式阻抗谱检测系统，包括阻抗谱检测芯片20、激励信号放大调理模块21、用于采集样品阻抗谱信息的第一传感器22、采集信号放大调理模块23、用于为第一传感器提供参考阻抗谱信息的第二传感器24、第一缓冲芯片25、第二缓冲芯片26和信号差分模块27。FIG. 2 is a structural diagram of a differential impedance spectroscopy detection system provided by the present invention. The differential impedance spectrum detection system includes an impedance spectrum detection chip 20, an excitation signal amplification and conditioning module 21, a first sensor 22 for collecting sample impedance spectrum information, and a collection signal amplification and conditioning module 23 for providing a reference impedance for the first sensor The second sensor 24 for spectrum information, the first buffer chip 25 , the second buffer chip 26 and the signal difference module 27 .
在具体实施中，当需要检测时，阻抗谱检测芯片20产生激励信号，并将激励信号传输至与其连接的激励信号放大调理模块21，激励信号放大调理模块21对该激励信号放大和调理，从而达到数字动态调节激励信号幅值、扩大检测量程的目的，并将放大和调理后的激励信号传输至第一传感器22和第二传感器24。第一传感器22用于采集样品的阻抗谱信息，第二传感器24用于为所述第一传感器提供参考阻抗谱信息。第一缓冲芯片25与第一传感器22连接，将第一传感器22的采集信号进行缓冲，第二缓冲芯片26与第二传感器24连接，将第二传感器24的参考信号进行缓冲。信号差分模块27与第一缓冲芯片25和第二缓冲芯片26连接，将第一传感器22和第二传感器24被激励后产生的响应信号进行差分处理。采集信号放大调理模块23与信号差分模块27连接，对差分处理后的响应信号进行放大和调理以获取输出信号，从而满足阻抗谱检测芯片20的要求。阻抗谱检测芯片20还与采集信号放大调理模块23连接，对采集信号放大调理模块23的输出信号进行阻抗谱解析处理，得到样品的阻抗谱信息。In specific implementation, when detection is required, the impedance spectrum detection chip 20 generates an excitation signal, and transmits the excitation signal to the excitation signal amplification conditioning module 21 connected thereto, and the excitation signal amplification conditioning module 21 amplifies and conditions the excitation signal, thereby The purpose of digitally dynamically adjusting the amplitude of the excitation signal and expanding the detection range is achieved, and the amplified and adjusted excitation signal is transmitted to the first sensor 22 and the second sensor 24 . The first sensor 22 is used to collect impedance spectrum information of the sample, and the second sensor 24 is used to provide reference impedance spectrum information for the first sensor. The first buffer chip 25 is connected to the first sensor 22 to buffer the collected signal of the first sensor 22 , and the second buffer chip 26 is connected to the second sensor 24 to buffer the reference signal of the second sensor 24 . The signal difference module 27 is connected with the first buffer chip 25 and the second buffer chip 26, and performs differential processing on the response signals generated after the first sensor 22 and the second sensor 24 are excited. The acquisition signal amplification and conditioning module 23 is connected to the signal difference module 27 to amplify and condition the differentially processed response signal to obtain an output signal, so as to meet the requirements of the impedance spectrum detection chip 20 . The impedance spectrum detection chip 20 is also connected to the acquisition signal amplification and conditioning module 23, and performs impedance spectrum analysis processing on the output signal of the acquisition signal amplification and conditioning module 23 to obtain the impedance spectrum information of the sample.
本实施例提供的差分式阻抗谱检测系统，通过采用双通道，即采用用于采集样品阻抗谱信息的第一传感器和用于为所述第一传感器提供参考阻抗谱信息的第二传感器，以及信号差分模块，因此在检测过程中，仅提取第一传感器和第二传感器的差异信息进行放大和调理，降低了由于传感器的基底带来的影响，从而提高了检测的灵敏度。The differential impedance spectrum detection system provided in this embodiment adopts dual channels, that is, a first sensor for collecting sample impedance spectrum information and a second sensor for providing reference impedance spectrum information for the first sensor, and Signal difference module, so in the detection process, only the difference information between the first sensor and the second sensor is extracted for amplification and conditioning, which reduces the influence caused by the substrate of the sensor, thereby improving the detection sensitivity.
需要说明的是，本实施例中没有具体限定第一传感器和第二传感器的具体类型，可以是电容传感器。It should be noted that, in this embodiment, the specific types of the first sensor and the second sensor are not specifically limited, and they may be capacitive sensors.
作为一种优选的实施方式，所述阻抗谱检测芯片具体为AD5933阻抗谱检测芯片。As a preferred embodiment, the impedance spectrum detection chip is specifically an AD5933 impedance spectrum detection chip.
图3为本发明提供的另一种差分式阻抗谱检测系统的结构图。阻抗谱检测芯片20具体为AD5933阻抗谱检测芯片。FIG. 3 is a structural diagram of another differential impedance spectroscopy detection system provided by the present invention. The impedance spectrum detection chip 20 is specifically an AD5933 impedance spectrum detection chip.
作为一种优选的实施方式，所述信号差分模块具体为可变增益放大器LMH6503。As a preferred implementation manner, the signal difference module is specifically a variable gain amplifier LMH6503.
如图3所示，信号差分模块27为可变增益放大器LMH6503。As shown in FIG. 3 , the signal difference module 27 is a variable gain amplifier LMH6503.
作为一种优选的实施方式，所述激励信号放大调理模块具体包括MAX532芯片，所述采集信号放大调理模块具体包括MAX532芯片和运算放大器OP37，所述第一缓冲芯片和所述第二缓冲芯片具体包括MAX4203缓冲芯片。As a preferred embodiment, the excitation signal amplification and conditioning module specifically includes a MAX532 chip, the acquisition signal amplification and conditioning module specifically includes a MAX532 chip and an operational amplifier OP37, and the first buffer chip and the second buffer chip specifically Includes MAX4203 buffer chip.
如图3所示，激励信号放大调理模块21具体包括MAX532芯片，用于将激励信号放大、调理并传输至第一传感器22和第二传感器24。采集信号放大调理模块23具体包括MAX532芯片和运算放大器OP37，其中，运算放大器OP37主要对信号进行直流偏置，以满足AD5933阻抗谱检测芯片的输入要求。第一缓冲芯片25和第二缓冲芯片26具体包括MAX4203缓冲芯片。As shown in FIG. 3 , the excitation signal amplification and conditioning module 21 specifically includes a MAX532 chip for amplifying, conditioning and transmitting the excitation signal to the first sensor 22 and the second sensor 24 . The acquisition signal amplification and conditioning module 23 specifically includes a MAX532 chip and an operational amplifier OP37, wherein the operational amplifier OP37 mainly performs DC bias on the signal to meet the input requirements of the AD5933 impedance spectrum detection chip. The first buffer chip 25 and the second buffer chip 26 specifically include a MAX4203 buffer chip.
需要说明的是，本发明中之所以区分第一缓冲芯片和第二缓冲芯片是为了说明二者和第一传感器和第二传感器的连接关系，二者可以是相同的芯片，也可以是不同的芯片。It should be noted that the reason for distinguishing the first buffer chip and the second buffer chip in the present invention is to illustrate the connection relationship between the two and the first sensor and the second sensor. The two can be the same chip or different chips. chip.
作为一种优选的实施方式，还包括：单片机和移动终端；As a preferred embodiment, it also includes: a single-chip microcomputer and a mobile terminal;
其中，所述单片机与所述阻抗谱检测芯片通信，用于获取所述阻抗谱检测芯片的阻抗谱解析处理结果，以及向所述阻抗谱检测芯片发送采集指令；Wherein, the single-chip microcomputer communicates with the impedance spectrum detection chip, and is used to obtain the impedance spectrum analysis processing result of the impedance spectrum detection chip, and send an acquisition instruction to the impedance spectrum detection chip;
所述移动终端与所述单片机通信，用于显示所述阻抗谱检测芯片的阻抗谱解析处理结果。The mobile terminal communicates with the single-chip microcomputer, and is used to display the impedance spectrum analysis processing result of the impedance spectrum detection chip.
如图3所示，在具体实施中，阻抗谱检测芯片20虽然能完成对样品的阻抗谱检测，但是为了系统的完整性，可以在上述实施例的基础上增加单片机30和移动终端31。单片机30可以获取阻抗谱检测芯片20的阻抗谱解析处理结果，还可以向阻抗谱检测芯片20发送采集指令。移动终端31与单片机30通信，可以显示所述阻抗谱检测芯片20的阻抗谱解析处理结果。As shown in FIG. 3 , in a specific implementation, although the impedance spectrum detection chip 20 can complete the impedance spectrum detection of the sample, for the integrity of the system, a single-chip microcomputer 30 and a mobile terminal 31 can be added on the basis of the above-mentioned embodiments. The single-chip microcomputer 30 can obtain the impedance spectrum analysis processing result of the impedance spectrum detection chip 20 , and can also send a collection instruction to the impedance spectrum detection chip 20 . The mobile terminal 31 communicates with the single-chip microcomputer 30 and can display the impedance spectrum analysis processing result of the impedance spectrum detection chip 20 .
需要说明的是，单片机可以采用LPC175X芯片，通过I/O通信接口与阻抗谱检测芯片通信，移动终端可以通过RS232与单片机通信。It should be noted that the single-chip microcomputer can use the LPC175X chip to communicate with the impedance spectrum detection chip through the I/O communication interface, and the mobile terminal can communicate with the single-chip microcomputer through RS232.
实施例二Embodiment two
图4为本发明提供的一种差分式阻抗谱检测方法的流程图。差分式阻抗谱检测方法，包括：FIG. 4 is a flow chart of a differential impedance spectroscopy detection method provided by the present invention. Differential impedance spectroscopy detection method, including:
S40：产生激励信号。S40: Generate an excitation signal.
S41：将所述激励信号放大、调理并传输至第一传感器和第二传感器。S41: Amplify, condition and transmit the excitation signal to the first sensor and the second sensor.
S42：对所述第一传感器的采集信号和所述第二传感器的参考信号进行缓冲。S42: Buffer the collection signal of the first sensor and the reference signal of the second sensor.
S43：产生响应信号，所述响应信号为所述第一传感器和所述第二传感器被激励后产生的信号。S43: Generate a response signal, where the response signal is a signal generated after the first sensor and the second sensor are excited.
S44：对所述响应信号差分处理。S44: Differentially process the response signal.
S45：对差分处理后的响应信号进行放大和调理以获取输出信号。S45: Amplifying and conditioning the differentially processed response signal to obtain an output signal.
S46：对所述输出信号进行阻抗谱解析处理。S46: Perform impedance spectrum analysis processing on the output signal.
由于上述差分式阻抗谱检测方法与实施例一中的差分式阻抗谱检测系统是相对应的，具体描述请参见实施例一。Since the above differential impedance spectroscopy detection method corresponds to the differential impedance spectroscopy detection system in the first embodiment, please refer to the first embodiment for specific description.
作为一种优选的实施方式，所述产生激励信号具体为：As a preferred implementation manner, the generating the excitation signal is specifically:
通过AD5933阻抗谱检测芯片产生激励信号。The excitation signal is generated by the AD5933 impedance spectrum detection chip.
作为一种优选的实施方式，所述对所述响应信号差分处理具体为：As a preferred implementation manner, the differential processing of the response signal is specifically:
通过可变增益放大器LMH6503对所述响应信号差分处理。The response signal is differentially processed by a variable gain amplifier LMH6503.
作为一种优选的实施方式，所述将所述激励信号放大、调理并传输至第一传感器和第二传感器具体为：As a preferred implementation manner, the amplifying, conditioning and transmitting the excitation signal to the first sensor and the second sensor is specifically:
通过MAX532芯片将所述激励信号放大、调理并传输至第一传感器和第二传感器；The excitation signal is amplified, conditioned and transmitted to the first sensor and the second sensor through the MAX532 chip;
所述对所述第一传感器的采集信号和所述第二传感器的参考信号进行缓冲具体为：The buffering of the acquisition signal of the first sensor and the reference signal of the second sensor is specifically:
通过第一缓冲芯片MAX4203对所述采集信号进行缓冲，通过第二缓冲芯片MAX4203对所述参考信号进行缓冲；The first buffer chip MAX4203 is used to buffer the acquisition signal, and the second buffer chip MAX4203 is used to buffer the reference signal;
所述对差分处理后的响应信号进行放大和调理以获取输出信号具体为：The step of amplifying and conditioning the differentially processed response signal to obtain the output signal is specifically:
通过MAX532芯片和运算放大器OP37对差分处理后的响应信号进行放大和调理以获取输出信号。Through the MAX532 chip and the operational amplifier OP37, the response signal after differential processing is amplified and conditioned to obtain the output signal.
图5为本发明提供的另一种差分式阻抗谱检测方法的流程图。差分式阻抗谱检测方法，还包括：FIG. 5 is a flowchart of another differential impedance spectroscopy detection method provided by the present invention. The differential impedance spectroscopy detection method also includes:
S50：获取所述阻抗谱解析处理的结果，以及发送采集指令。S50: Obtain a result of the impedance spectrum analysis processing, and send an acquisition instruction.
S51：显示所述阻抗谱解析处理的结果。S51: Display the results of the impedance spectrum analysis processing.
由于上述优选的实施方式与实施例一中的优选实施方式相对应，具体描述请参见实施例一。Since the preferred implementation manner described above corresponds to the preferred implementation manner in the first embodiment, please refer to the first embodiment for specific description.
图6为本发明提供的一种现有技术的阻抗谱检测结果和差分式阻抗谱检测结果的对比图。如图6所示，以200mV为基底信号，激励信号变化量为0-100mV得到的响应信号的结果。其中，横轴为频率，纵轴为阻抗响应信号的实部值，虚线表示采用差分式阻抗谱检测方法获取的结果，实线表示采用单通道方法获取的结果，箭头所示方向为激励信号变化量从0到100mV得到的响应信号变化方向。FIG. 6 is a comparison chart of the detection results of impedance spectroscopy and differential impedance spectroscopy provided by the present invention. As shown in Figure 6, the result of the response signal is obtained by taking 200mV as the base signal and the variation of the excitation signal is 0-100mV. Among them, the horizontal axis is the frequency, the vertical axis is the real part value of the impedance response signal, the dotted line represents the result obtained by the differential impedance spectrum detection method, the solid line represents the result obtained by the single-channel method, and the direction indicated by the arrow is the change of the excitation signal Quantity from 0 to 100mV to get the response signal change direction.
图7为本发明提供的另一种现有技术的阻抗谱检测结果和差分式阻抗谱检测结果的对比图。如图7所示，以400mV为基底信号，激励信号变化量为0-100mV得到的响应信号的结果。其中，横轴为频率，纵轴为阻抗响应信号的实部值，虚线表示采用差分式阻抗谱检测方法获取的结果，实线表示采用单通道方法获取的结果，箭头所示方向为激励信号变化量从0到100mV得到的响应信号变化方向。FIG. 7 is a comparison chart of another prior art impedance spectrum detection result and a differential impedance spectrum detection result provided by the present invention. As shown in Figure 7, the result of the response signal is obtained by taking 400mV as the base signal and the change of the excitation signal is 0-100mV. Among them, the horizontal axis is the frequency, the vertical axis is the real part value of the impedance response signal, the dotted line represents the result obtained by the differential impedance spectrum detection method, the solid line represents the result obtained by the single-channel method, and the direction indicated by the arrow is the change of the excitation signal Quantity from 0 to 100mV to get the response signal change direction.
图8为本发明提供的另一种现有技术的阻抗谱检测结果和差分式阻抗谱检测结果的对比图。如图8所示，以1000mV为基底信号，激励信号变化量为0-100mV得到的响应信号的结果。其中，横轴为频率，纵轴为阻抗响应信号的实部值，虚线表示采用差分式阻抗谱检测方法获取的结果，实线表示采用单通道方法获取的结果，箭头所示方向为激励信号变化量从0到100mV得到的响应信号变化方向。FIG. 8 is a comparison diagram between the impedance spectrum detection results of another prior art and the differential impedance spectrum detection results provided by the present invention. As shown in Figure 8, the result of the response signal obtained by taking 1000mV as the base signal and changing the excitation signal from 0 to 100mV. Among them, the horizontal axis is the frequency, the vertical axis is the real part value of the impedance response signal, the dotted line represents the result obtained by the differential impedance spectrum detection method, the solid line represents the result obtained by the single-channel method, and the direction indicated by the arrow is the change of the excitation signal Quantity from 0 to 100mV to get the response signal change direction.
由图6-8可以得出，在同一基底下，响应信号随信号增加量的增大呈规律性变化，且不同的基底信号时，利用差分式阻抗谱检测方法获取的响应信号的变化量基本一致，即差分式阻抗谱检测方法不受基底信号的影响或者受基底信号的影响较小。因此，差分式阻抗谱检测方法能够提高检测的灵敏度。From Figure 6-8, it can be concluded that under the same substrate, the response signal changes regularly with the increase of the signal increase, and when the substrate signal is different, the variation of the response signal obtained by the differential impedance spectroscopy detection method is basically the same. Consistent, that is, the differential impedance spectroscopy detection method is not affected by the substrate signal or is less affected by the substrate signal. Therefore, the differential impedance spectroscopy detection method can improve the detection sensitivity.
以上对本发明所提供的差分式阻抗谱检测系统及方法进行了详细介绍。本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想。应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以对本发明进行若干改进和修饰，这些改进和修饰也落入本发明权利要求的保护范围内。The differential impedance spectroscopy detection system and method provided by the present invention have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.
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