CN105187064B - A kind of self correcting system based on graphene sensor - Google Patents
A kind of self correcting system based on graphene sensor Download PDFInfo
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- CN105187064B CN105187064B CN201510729642.XA CN201510729642A CN105187064B CN 105187064 B CN105187064 B CN 105187064B CN 201510729642 A CN201510729642 A CN 201510729642A CN 105187064 B CN105187064 B CN 105187064B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 94
- 238000006243 chemical reaction Methods 0.000 claims description 68
- 238000004364 calculation method Methods 0.000 claims description 19
- 238000012937 correction Methods 0.000 claims description 11
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- 230000003068 static effect Effects 0.000 description 10
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- 230000009286 beneficial effect Effects 0.000 description 2
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- 238000011031 large-scale manufacturing process Methods 0.000 description 1
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Abstract
The present invention provides a kind of self correcting system based on graphene sensor, including power supply, graphene sensor, the deformation data for the graphene sensor to be deformed upon are converted to the piezoelectricity change-over circuit of analog signal, analog-digital converter and microcontroller for the analog signal to be converted to data signal；Wherein, one end of microcontroller and the output end of analog-digital converter connect, the other end is connected with piezoelectricity change-over circuit, for the resistance size of the Digital Signals regulation piezoelectricity change-over circuit according to analog-digital converter output, meets threshold condition to control to adjust the data signal of analog-digital converter output.This invention ensures that analog-digital converter has maximum dynamic range, and cause analog-digital converter that there is the best linearity, improve the accuracy of subsequent conditioning circuit processing data.
Description
Technical Field
The invention relates to the technical field of correction, in particular to a self-correcting system based on a graphene sensor.
Background
The graphene sensor is a material for changing the resistance value of the graphene sensor through deformation, is light, thin, soft, strong in plasticity, sensitive to deformation reaction, low in cost and easy for large-scale production and manufacturing. Therefore, based on the above advantages of the graphene sensor, the graphene sensor is widely used, for example, in application scenarios such as running posture recognition and pulse recognition.
The intrinsic resistance of the graphene sensor is the resistance which is shown by the graphene sensor when the graphene sensor is not deformed at all.
In an application system including a graphene sensor, it is necessary to include both a piezoelectric conversion circuit connected to the graphene sensor and an analog-to-digital converter connected to the piezoelectric conversion circuit. The piezoelectric conversion circuit is used for converting deformation information of deformation of the graphene sensor into an electric signal (the electric signal is an analog signal), and then sending the electric signal to the analog-to-digital converter. The analog-to-digital converter converts the electric signal into a digital signal, and then sends the digital signal to a subsequent circuit, so that the subsequent circuit performs subsequent data processing.
However, in the practical application process, the intrinsic resistances of different graphene sensors are different, and when different graphene sensors are applied to the same application system, the voltage values output by the piezoelectric conversion circuits cannot be guaranteed to be all at the correct voltage value, generally, the correct voltage value refers to a half of the power voltage value, or a value within a preset voltage value range, where the preset voltage value range includes a half of the power voltage value. When the voltage value output by the piezoelectric conversion circuit is not at the correct voltage value, the dynamic range of the analog-to-digital converter is reduced, which causes the following problems in the system:
1. the dynamic range of the analog-to-digital converter is reduced, so that data is easy to overflow, and processing errors of subsequent circuits are caused.
2. When the static operating point of the analog-to-digital converter is not at the correct voltage value, the linearity of the analog-to-digital converter is reduced, so that the conversion result error of the analog-to-digital converter is increased, and the precision of the subsequent circuit for processing data is reduced.
Disclosure of Invention
In view of this, the present invention provides a self-calibration system based on a graphene sensor, so as to solve the problems that in the prior art, it is not ensured that the voltage values output by a piezoelectric conversion circuit are all at the correct voltage values, so that the dynamic range of an analog-to-digital converter is reduced, data is easy to overflow, so that errors occur in the processing process of a subsequent circuit, and when the static operating point of the analog-to-digital converter is not at the correct voltage value, the linearity of the analog-to-digital converter is reduced, so that the conversion result error of the analog-to-digital converter is increased, and the precision of the subsequent circuit for processing data is reduced. The technical scheme is as follows:
the invention provides a self-correcting system based on a graphene sensor, which comprises a power supply, the graphene sensor, a piezoelectric conversion circuit, an analog-to-digital converter and a microcontroller, wherein the piezoelectric conversion circuit is used for converting deformation information of the deformation of the graphene sensor into an analog signal; wherein,
one end of the piezoelectric conversion circuit is simultaneously connected with the power supply and the microcontroller, and the other end of the piezoelectric conversion circuit is simultaneously connected with the graphene sensor and the input end of the analog-to-digital converter;
the output end of the analog-to-digital converter is connected with the microcontroller and is simultaneously connected with a subsequent circuit;
one end of the microcontroller is connected with the output end of the analog-to-digital converter, and the other end of the microcontroller is connected with the piezoelectric conversion circuit and used for controlling and adjusting the resistance value of the piezoelectric conversion circuit according to the digital signal output by the analog-to-digital converter so as to control and adjust the digital signal output by the analog-to-digital converter to meet a threshold condition.
Preferably, the piezoelectric conversion circuit comprises a group of resistor arrays, and each resistor in the resistor arrays is connected in parallel through a switch;
the microcontroller is specifically configured to control the switches in the resistor array to be turned on or off according to the digital signal output by the analog-to-digital converter, so as to control and adjust the digital signal output by the analog-to-digital converter to meet a threshold condition.
Preferably, the microcontroller comprises:
the calculation circuit is used for calculating the current resistance value of the graphene sensor according to the digital signal output by the analog-to-digital converter;
and the control circuit is used for controlling the on/off of a switch in the resistor array according to the calculated current resistance value of the graphene sensor.
Preferably, the microcontroller further comprises:
and the filter circuit is arranged between the analog-to-digital converter and the computing circuit and is used for filtering the digital signal so as to filter out a noise signal in the digital signal.
Preferably, the digital signal output by the analog-to-digital converter satisfying the threshold condition comprises:
the voltage value represented by the digital signal output by the analog-to-digital converter is equal to half of the power supply voltage value output by the power supply;
or the voltage value represented by the digital signal output by the analog-to-digital converter is in a preset range.
By applying the technical scheme, the self-correcting system based on the graphene sensor comprises a power supply, the graphene sensor, a piezoelectric conversion circuit for converting deformation information of deformation of the graphene sensor into an analog signal, an analog-to-digital converter for converting the analog signal into a digital signal, and a microcontroller. One end of the piezoelectric conversion circuit is connected with the power supply and the microcontroller at the same time, the other end of the piezoelectric conversion circuit is connected with the graphene sensor and the input end of the analog-to-digital converter at the same time, the output end of the analog-to-digital converter is connected with the microcontroller and the subsequent circuit at the same time, one end of the microcontroller is connected with the output end of the analog-to-digital converter, and the other end of the microcontroller is connected with the piezoelectric conversion circuit and used for controlling and adjusting the resistance value of the piezoelectric conversion circuit according to the digital signal output by the analog-to-digital converter so as to control and adjust the digital signal output by. Therefore, the graphene sensor-based self-correction system provided by the invention comprises a feedback circuit consisting of the piezoelectric conversion circuit, the analog-to-digital converter and the microcontroller, when the microcontroller knows that the voltage value output by the current analog-to-digital converter does not meet the threshold condition according to the digital signal output by the analog-to-digital converter, the resistance value of the piezoelectric conversion circuit is controlled and adjusted to realize that the voltage value output by the analog-to-digital converter meets the threshold condition, so that the static working point of the piezoelectric conversion circuit is corrected to a correct voltage value (such as half of a power supply voltage value), the analog-to-digital converter is guaranteed to have a maximum dynamic range, the correctness of data is guaranteed to the maximum extent, and the occurrence of data overflow is prevented. Meanwhile, the invention also ensures that the static working point of the analog-to-digital converter is positioned on a correct voltage value (such as half of a power supply voltage value), so that the analog-to-digital converter has the best linearity, thereby ensuring the precision of the conversion result of the analog-to-digital converter, and improving the precision of various algorithm calculation results in a subsequent circuit, namely improving the accuracy of the subsequent circuit for processing data.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art application system including a graphene sensor;
fig. 2 is a schematic structural diagram of a graphene sensor-based self-calibration system according to the present invention;
fig. 3 is another schematic structural diagram of a graphene sensor-based self-calibration system according to the present invention;
FIG. 4 is a schematic diagram of a microcontroller according to the present invention;
fig. 5 is a schematic structural diagram of a self-calibration system based on a graphene sensor according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a schematic structural diagram of an application system including a graphene sensor in the prior art, which includes a graphene sensor 10, a piezoelectric conversion circuit 20, an analog-to-digital converter 30, and a subsequent circuit 40.
The piezoelectric conversion circuit 20 is configured to convert deformation information of the graphene sensor 10, which is deformed, into an electrical signal, and send the electrical signal to the analog-to-digital converter 30. The analog-to-digital converter 30 converts the received electrical signal into a digital signal, and then sends the digital signal to the subsequent circuit 40, and the subsequent circuit 40 processes subsequent data according to the digital signal.
However, in practical applications, the intrinsic resistances of different graphene sensors 10 are different, and when different graphene sensors 10 are applied to the same application system, the voltage values output by the piezoelectric conversion circuit 20 cannot be guaranteed to be all at the correct voltage values. The correct voltage value in the present invention refers to a half of the power voltage value, or a value within a preset voltage value range including a half of the power voltage value. For convenience of illustration, the present invention is described with the correct voltage being half of the power voltage.
When the intrinsic resistances of the graphene sensors 10 are different, the voltage value output by the piezoelectric conversion circuit 20 may not be equal to half of the power voltage value, and accordingly, the voltage value represented by the digital signal output by the analog-to-digital converter 30 is not equal to half of the power voltage value, and at this time, the following problems may exist in the application system:
1. the dynamic range of the analog-to-digital converter 30 is reduced, so that data is easy to overflow, and errors occur in the processing process of the subsequent circuit 40;
2. when the quiescent point of the adc 30 is not half of the power supply voltage, the linearity of the adc 30 is reduced, which results in an increase in error of the conversion result of the adc 30, and thus reduces the accuracy of the subsequent circuit 40 for processing data.
Based on the above problems in the prior art, the inventors of the present invention have found that the above problems in the prior art can be solved if the non-ideal characteristics of the analog-to-digital converter 30 can be reduced as much as possible. Therefore, one of the design ideas of the present invention includes, but is not limited to, calibrating the quiescent operating point of the piezoelectric converter 20 to the intermediate potential of the supply voltage to ensure the maximum dynamic range of the analog-to-digital converter 30. Then the data correctness can be ensured to the maximum extent when the analog-to-digital converter 30 has the maximum dynamic range, so as to prevent the data overflow. Moreover, if the static operating point of the analog-to-digital converter 30 is also half of the power voltage value, the analog-to-digital converter 30 has the best linearity, so that the digital signal converted by the analog-to-digital converter 30 has the highest precision, which is helpful for improving the precision of the calculation results of various algorithms in the subsequent circuit 40 and ensuring the accuracy of the data processing of the subsequent circuit 40.
Specifically, please refer to fig. 2, which shows a schematic structural diagram of a graphene sensor-based self-calibration system provided in the present invention, including: power supply 100, graphene sensor 200, piezoelectric conversion circuit 300, analog-to-digital converter 400, and microcontroller 500. In particular, the amount of the solvent to be used,
the power supply 100 is used for supplying a power supply voltage, and an output terminal thereof is connected to one terminal of the piezoelectric transformer circuit 300.
One end of the piezoelectric conversion circuit 300 is connected to the power supply 100 and the microcontroller 500, and the other end thereof is connected to the graphene sensor 200 and the input end of the analog-to-digital converter 400, so as to convert the deformation information of the graphene sensor 200 into an analog signal.
In the present invention, referring to fig. 3, the piezoelectric transformer 300 may include a set of resistor arrays, and each resistor in the resistor arrays is connected in parallel through a switch.
The input end of the analog-to-digital converter 400 is connected with one end of the piezoelectric conversion circuit 300, and the output end of the analog-to-digital converter 400 is connected with the microcontroller 500 and the subsequent circuit 600 at the same time, and is used for converting the analog signal sent by the piezoelectric conversion circuit 300 into a digital signal and outputting the digital signal to the microcontroller 500 and the subsequent circuit 600. The subsequent circuit 600 performs subsequent data processing according to the digital signal.
One end of the microcontroller 500 is connected to the output end of the analog-to-digital converter 400, and the other end thereof is connected to the piezoelectric conversion circuit 300, and is configured to control and adjust the resistance of the piezoelectric conversion circuit 300 according to the digital signal output by the analog-to-digital converter 400, so as to control and adjust the digital signal output by the analog-to-digital converter 400 to meet the threshold condition.
Specifically, the digital signal output by the analog-to-digital converter 400 satisfies the threshold condition that a voltage value represented by the digital signal output by the analog-to-digital converter 400 is equal to half of a voltage value of the power supply output by the power supply 100, or a voltage value represented by the digital signal output by the analog-to-digital converter 400 is within a preset range. Wherein the value within the preset range includes a value of half of the power supply voltage value.
For convenience of subsequent description, the present invention is described by taking an example that the digital signal output by the analog-to-digital converter 400 satisfies the threshold condition, specifically, the voltage value represented by the digital signal output by the analog-to-digital converter 400 is equal to half of the power voltage value output by the power supply 100.
Specifically, in the present invention, the microcontroller 500 is specifically configured to control the switches in the resistor array to be turned on or off according to the digital signal output by the analog-to-digital converter 400, so as to control and adjust the digital signal output by the analog-to-digital converter 400 to meet a threshold condition. The specific structure of the microcontroller 500 is shown in fig. 4, and can be seen from fig. 5, which includes:
a calculation circuit 501 for calculating the current resistance value of the graphene sensor 200 according to the digital signal output by the analog-to-digital converter 400;
and a control circuit 502 for controlling the on/off of the switch in the resistor array according to the calculated current resistance value of the graphene sensor 200.
Preferably, the microcontroller 500 further includes a filter circuit 503 disposed between the analog-to-digital converter 400 and the computing circuit 501 for filtering the digital signal to remove a noise signal from the digital signal.
In practical applications, the digital signal output by the analog-to-digital converter 400 may include some noise signals, which may be generated by a false touch, or may be caused by undesirable deformation of the graphene sensor 200 due to an unexpected action in the measurement process, and may also be intrinsic noise, quantization noise, and the like of the circuit device. Therefore, the filter circuit 503 in the present invention can design a specific digital filter algorithm according to the characteristics of the correction system, so as to filter the digital signal output by the analog-to-digital converter 400, so as to filter out the noise signal.
In order to further elaborate the technical solution of the present invention, the inventor now further describes the self-calibration system based on the graphene sensor provided by the present invention in two application scenarios, i.e., when the graphene sensor 200 is not in operation and in operation.
Firstly, an application scenario of the graphene sensor 200 when not in operation:
in the present invention, the graphene sensor 200 is not in operation, that is, refers to an application scenario before the calibration system is not put into use. In the application scenario, the invention first needs to correct the dc operating point of the correction system.
Specifically, the graphene sensor 200 is first laid flat to ensure that the graphene sensor 200 does not deform, and the resistance of the graphene sensor 200 at this time is the intrinsic resistance of the graphene sensor 200.
When the graphene sensor 200 is not deformed, the piezoelectric conversion circuit 300 outputs a first voltage value, the analog-to-digital converter 400 converts the first voltage value into a first digital signal and outputs the first digital signal to the filter circuit 503 in the microcontroller 500, and after the first digital signal is filtered by the filter circuit 503, the calculation circuit 501 in the microcontroller 500 continues to calculate the current resistance value of the graphene sensor 200 according to the filtered first digital signal.
When the calculation circuit 501 calculates that the current resistance value of the graphene sensor 200 is equal to the intrinsic resistance value of the graphene sensor 200, it indicates that the current static operating point of the piezoelectric converter 300 is corrected to the middle potential of the power supply voltage, and at this time, the analog-to-digital converter 400 can have the maximum dynamic range, so that the correctness of data is ensured to the greatest extent, and data overflow is prevented. Meanwhile, because the static operating point of the analog-to-digital converter 400 is also half of the power supply voltage value, the analog-to-digital converter 400 has the best linearity at this time, so that the digital signal converted by the analog-to-digital converter 400 has the highest precision, which is beneficial to improving the precision of various algorithm calculation results in the subsequent circuit 600 and ensuring the accuracy of the subsequent circuit 600 in processing data.
When the calculation circuit 501 calculates that the current resistance value of the graphene sensor 200 is smaller than the intrinsic resistance value of the graphene sensor 200, that is, the current voltage value output by the analog-to-digital converter 400 is greater than half of the power voltage value output by the power supply 100, at this time, the control circuit 502 in the microcontroller 500 controls some switches in the resistor array to be closed according to the current resistance value of the graphene sensor 200 calculated by the current calculation circuit 501, so as to reduce the resistance value of the piezoelectric conversion circuit 300, so that after the resistance value of the piezoelectric conversion circuit 300 is adjusted, the calculation circuit 501 calculates again according to the second digital signal output by the analog-to-digital converter 400 that the current resistance value of the graphene sensor 200 is equal to the intrinsic resistance value of the graphene sensor 200, at this time, the analog-to-digital converter 400 can be guaranteed to have the maximum dynamic range, and the analog-to-digital converter 400 has the best linearity, the accuracy of the subsequent circuit 600 in processing data is guaranteed.
When the calculation circuit 501 calculates that the current resistance value of the graphene sensor 200 is greater than the intrinsic resistance value of the graphene sensor 200, that is, the current voltage value output by the analog-to-digital converter 400 is less than half of the power voltage value output by the power supply 100, the control circuit 502 in the microcontroller 500 controls some switches in the resistor array to be turned off according to the current resistance value of the graphene sensor 200 calculated by the current calculation circuit 501 to increase the resistance value of the piezoelectric conversion circuit 300, so that after the resistance value of the piezoelectric conversion circuit 300 is adjusted, the calculation circuit 501 calculates again according to the third digital signal output by the analog-to-digital converter 400 to obtain that the current resistance value of the graphene sensor 200 is equal to the intrinsic resistance value of the graphene sensor 200, and at this time, the analog-to-digital converter 400 can be guaranteed to have the maximum dynamic range and the analog-to-digital converter 400 has the best linearity, the accuracy of the subsequent circuit 600 in processing data is guaranteed.
Through the adjustment, the direct current working point of the correction system is ensured to be on the correct voltage value, so that the system precision of the correction system before the correction system is not put into use is ensured.
Secondly, the application scenario of the graphene sensor 200 in the working state is as follows:
in the present invention, when the graphene sensor 200 is in a working state, the resistance value of the graphene sensor 200 changes correspondingly with the deformation of the graphene sensor, and then when the resistance value of the graphene sensor 200 changes, the voltage value output by the piezoelectric conversion circuit 300 and the digital signal output by the analog-to-digital converter 400 both change accordingly, and the voltage value represented by the digital signal output by the analog-to-digital converter 400 cannot be guaranteed to be equal to half of the power voltage value.
Based on this, in the practical application process of the present invention, when the graphene sensor 200 deforms and the resistance value changes, the piezoelectric conversion circuit 300 outputs a second voltage value, the analog-to-digital converter 400 converts the second voltage value into a fourth digital signal and outputs the fourth digital signal to the filter circuit 503 in the microcontroller 500, and after the filtering process of the filter circuit 503, the calculation circuit 501 in the microcontroller 500 continues to calculate the current resistance value of the graphene sensor 200 according to the filtered fourth digital signal.
Further, when the microcontroller 500 determines, according to the fourth digital signal output by the analog-to-digital converter 400, that the voltage value represented by the current fourth digital signal is not equal to half of the power voltage value output by the power supply 100, it indicates that the output voltage value of the analog-to-digital converter 400 in the current correction system is not at the correct voltage value, at this time, the calculation circuit 501 in the microcontroller 500 calculates, according to the fourth digital signal, to obtain the current resistance value of the graphene sensor 200, and then the control circuit 502 controls the switch in the resistance array to be turned on or turned off according to the current resistance value of the graphene sensor 200 calculated by the calculation circuit 501.
Specifically, when the current resistance value of the graphene sensor 200 is greater than the resistance value of the piezoelectric conversion circuit 300, some switches in the resistor array in the piezoelectric conversion circuit 300 are controlled to be turned off to increase the resistance value of the piezoelectric conversion circuit 300, so that the adjusted resistance value of the piezoelectric conversion circuit 300 is equal to the current resistance value of the graphene sensor 200. When the resistance value of the graphene sensor 200 is smaller than the resistance value of the piezoelectric conversion circuit 300, some switches in the resistor array in the piezoelectric conversion circuit 300 are controlled to be closed to reduce the resistance value of the piezoelectric conversion circuit 300, so that the adjusted resistance value of the piezoelectric conversion circuit 300 is equal to the current resistance value of the graphene sensor 200, and thus the output voltage value of the analog-to-digital converter 400 in the current correction system is always in the correct voltage value, that is, equal to half of the power supply voltage value. Therefore, by adjusting the resistance of the piezoelectric conversion circuit 300 in real time, the static operating point of the analog-to-digital converter 400 in the current correction system is guaranteed to be half of the power voltage value, so that the analog-to-digital converter 30 has the best linearity, and thus the digital signal converted by the analog-to-digital converter 30 has the highest precision, which is beneficial to improving the precision of calculation results of various algorithms in the subsequent circuit 40, and the accuracy of data processing of the subsequent circuit 600 is guaranteed.
Therefore, by applying the above technical solution of the present invention, the self-calibration system based on the graphene sensor provided by the present invention includes a power supply 100, the graphene sensor 200, a piezoelectric conversion circuit 300 for converting deformation information of deformation of the graphene sensor 200 into an analog signal, an analog-to-digital converter 400 for converting the analog signal into a digital signal, and a microcontroller 500. One end of the piezoelectric conversion circuit 300 is connected to the power supply 100 and the microcontroller 500 at the same time, the other end of the piezoelectric conversion circuit is connected to the graphene sensor 200 and the input end of the analog-to-digital converter 400 at the same time, the output end of the analog-to-digital converter 400 is connected to the microcontroller 500 and connected to the subsequent circuit 600 at the same time, one end of the microcontroller 500 is connected to the output end of the analog-to-digital converter 400, and the other end of the microcontroller is connected to the piezoelectric conversion circuit 300 and is used for controlling and adjusting the resistance of the piezoelectric conversion circuit 300 according to the digital signal output by the analog-to-digital converter 400 so as to control and adjust the digital signal output by. Therefore, the graphene sensor-based self-calibration system provided by the invention comprises a feedback circuit composed of the piezoelectric conversion circuit 300, the analog-to-digital converter 400 and the microcontroller 500, and when the microcontroller 500 knows that the voltage value output by the analog-to-digital converter 400 does not meet the threshold condition currently according to the digital signal output by the analog-to-digital converter 400, the resistance value of the piezoelectric conversion circuit 300 is controlled and adjusted to realize that the voltage value output by the analog-to-digital converter 400 meets the threshold condition, so that the static working point of the piezoelectric conversion circuit 300 is calibrated to the correct voltage value (such as half of the power voltage value), the analog-to-digital converter 400 is ensured to have the maximum dynamic range, the correctness of data is ensured to the maximum extent, and the occurrence of data overflow is prevented. Meanwhile, the present invention also ensures that the static operating point of the analog-to-digital converter 400 is at the correct voltage value (e.g., half of the power voltage value), so that the analog-to-digital converter 400 has the best linearity, thereby ensuring the accuracy of the conversion result of the analog-to-digital converter 400, and improving the accuracy of the calculation result of various algorithms in the subsequent circuit 600, i.e., improving the accuracy of the data processing of the subsequent circuit 600.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The self-calibration system based on the graphene sensor provided by the invention is described in detail above, and the principle and the implementation of the invention are explained in the present document by applying specific examples, and the description of the above examples is only used to help understanding the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (4)
1. A self-correcting system based on a graphene sensor is characterized by comprising a power supply, the graphene sensor, a piezoelectric conversion circuit, an analog-to-digital converter and a microcontroller, wherein the piezoelectric conversion circuit is used for converting deformation information of deformation of the graphene sensor into an analog signal; wherein,
one end of the piezoelectric conversion circuit is simultaneously connected with the power supply and the microcontroller, and the other end of the piezoelectric conversion circuit is simultaneously connected with the graphene sensor and the input end of the analog-to-digital converter;
the output end of the analog-to-digital converter is connected with the microcontroller and is simultaneously connected with a subsequent circuit;
one end of the microcontroller is connected with the output end of the analog-to-digital converter, and the other end of the microcontroller is connected with the piezoelectric conversion circuit and used for controlling and adjusting the resistance value of the piezoelectric conversion circuit according to the digital signal output by the analog-to-digital converter so as to control and adjust the digital signal output by the analog-to-digital converter to meet a threshold condition;
the piezoelectric conversion circuit comprises a group of resistor arrays, wherein each resistor in the resistor arrays is connected in parallel through a switch;
the microcontroller is specifically configured to control the switches in the resistor array to be turned on or off according to the digital signal output by the analog-to-digital converter, so as to control and adjust the digital signal output by the analog-to-digital converter to meet a threshold condition.
2. The self-correcting system of claim 1, wherein the microcontroller comprises:
the calculation circuit is used for calculating the current resistance value of the graphene sensor according to the digital signal output by the analog-to-digital converter;
and the control circuit is used for controlling the on/off of a switch in the resistor array according to the calculated current resistance value of the graphene sensor.
3. The self-correcting system of claim 2, wherein the microcontroller further comprises:
and the filter circuit is arranged between the analog-to-digital converter and the computing circuit and is used for filtering the digital signal so as to filter out a noise signal in the digital signal.
4. The self-correction system according to any one of claims 1-3, wherein the digital signal output by the analog-to-digital converter satisfying a threshold condition comprises:
the voltage value represented by the digital signal output by the analog-to-digital converter is equal to half of the power supply voltage value output by the power supply;
or the voltage value represented by the digital signal output by the analog-to-digital converter is in a preset range.
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| US20100259285A1 (en) * | 2007-03-05 | 2010-10-14 | Nokia Corporation | Providing feedback in an electronic circuit |
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| CN203337317U (en) * | 2013-06-27 | 2013-12-11 | 北京强度环境研究所 | Debugging and temperature compensation circuit for pressure sensor |
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