CN110441606B - Resistance value measuring device and method for resistance sensor and gas detection equipment - Google Patents
Resistance value measuring device and method for resistance sensor and gas detection equipment Download PDFInfo
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- CN110441606B CN110441606B CN201910749552.5A CN201910749552A CN110441606B CN 110441606 B CN110441606 B CN 110441606B CN 201910749552 A CN201910749552 A CN 201910749552A CN 110441606 B CN110441606 B CN 110441606B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
Abstract
The invention discloses a resistance value measuring device and method of a resistance type sensor and gas detection equipment, wherein the device comprises: the device comprises a first selection switch unit, a measuring resistor unit, a to-be-measured sensor connecting end, a voltage measuring unit and a control calculation unit; the measuring resistor unit comprises at least two measuring resistors with different resistance values; the connecting end of the sensor to be tested is used for connecting the first end of the sensor to be tested, and the second end of the sensor to be tested is used for providing a second fixed potential; the voltage measuring unit is used for measuring the voltage of the sensor to be measured and transmitting the voltage to the control computing unit; the control calculation unit is used for controlling the first selection switch unit to gate one measuring resistor in the measuring resistor unit to be used as a divider resistor and calculating the resistance value of the sensor to be measured. The invention can improve the measuring sensitivity of the resistance value of the sensor to be measured and improve the accuracy of the measured value of the gas concentration.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a resistance value measuring device and method of a resistance type sensor and gas detection equipment.
Background
The resistive sensor is used for a sensor that converts a non-electrical physical quantity to be measured into a change in resistance value. One important application is to detect the concentration of gas in a certain space, the sensor is made of a gas-sensitive semiconductor material, when the gas to be detected is in contact with the sensor, the resistance value of the sensor changes, and different gas concentration values have corresponding relations with the resistance value change of the sensor, so that the concentration of the gas to be detected can be obtained by measuring the resistance value of the sensor.
For a high resistance type resistance sensor with resistance values in the order of M Ω and G Ω, the resistance value is usually measured by using a resistance voltage division method. A common measurement method is to use a fixed measurement resistor close to the sensor resistance value to form a voltage division measurement circuit. However, since the resistance value of the sensor varies with the gas concentration, the value of the sensor is within a relatively wide resistance range, and the upper limit resistance value is often several times to several tens of times larger than the lower limit resistance value. The sensitivity of the measuring circuit is highest when the resistance of the sensor and the resistance of the measuring resistor are equal; the sensitivity of the measuring circuit is gradually reduced along with the increase of the resistance value of the sensor resistor and the deviation degree of the measuring resistor. In the prior art, the measuring resistance is usually constant, which results in a low sensitivity of the measuring circuit and thus a low accuracy of the measured value of the measured gas concentration.
Disclosure of Invention
The embodiment of the invention provides a resistance-type sensor resistance value measuring device and method and gas detection equipment, which can flexibly select a measuring resistor which is closer to the resistance value of a sensor to be detected as a divider resistor according to the resistance value of the sensor to be detected, improve the measuring sensitivity of the resistance value of the sensor to be detected and improve the accuracy of a measured value of gas concentration.
In a first aspect, an embodiment of the present invention provides a resistance measurement apparatus for a resistive sensor, including:
the device comprises a first selection switch unit, a measuring resistor unit, a to-be-measured sensor connecting end, a voltage measuring unit and a control calculation unit; wherein the content of the first and second substances,
the first end of the first selection switch unit is used for providing a first fixed potential;
the measuring resistor unit comprises at least two measuring resistors with different resistance values, a first end of each measuring resistor is connected with a second end of the first selection switch unit, and a second end of each measuring resistor is connected with the connecting end of the sensor to be measured;
the connecting end of the sensor to be tested is used for connecting the first end of the sensor to be tested, and the second end of the sensor to be tested is used for providing a second fixed potential;
the first end of the voltage measuring unit is connected with the connecting end of the sensor to be measured, the second end of the voltage measuring unit is connected with the control computing unit, and the voltage measuring unit is used for measuring the voltage of the sensor to be measured and transmitting the voltage to the control computing unit;
the third end of the first selection switch unit is connected with the control calculation unit, and the control calculation unit is used for controlling the first selection switch unit to gate one measuring resistor in the measuring resistor unit to serve as a divider resistor and calculate the resistance value of the sensor to be measured.
Optionally, the resistance value measuring device of the resistance sensor further includes a second selector switch unit, a first end of the second selector switch unit is connected to the connecting end of the sensor to be measured, a second end of the second selector switch unit is connected to at least two sensors to be measured, a third end of the second selector switch unit is connected to the control calculation unit, and the second selector switch unit is used for gating one sensor to be measured.
Optionally, the first selection switch unit and the second selection switch unit are one-out-of-multiple analog switches.
Optionally, the second end of the sensor to be tested is grounded.
In a second aspect, embodiments of the present invention provide a gas detection apparatus, including a resistance measurement device of a resistive sensor according to the first aspect of the present invention.
In a third aspect, an embodiment of the present invention provides a resistance value measuring method for a resistive sensor, where based on the resistance value measuring apparatus for a resistive sensor according to the first aspect of the present invention, the measuring method includes:
gating a first resistor, and calculating a first measured value of the sensor to be measured, wherein the first resistor is any one measuring resistor in the measuring resistor unit;
determining a second resistor and a third resistor, wherein a first measured value is larger than the resistance value of the second resistor and smaller than the resistance value of the third resistor, and the second resistor and the third resistor are two adjacent measuring resistors with the resistance values in the measuring resistor unit;
determining a critical resistance based on the second resistance and a third resistance, wherein the critical resistance is a measured value of the sensor to be measured calculated when the second resistance or the third resistance is switched on as a measuring resistance serving as a voltage dividing resistance and measuring sensitivities are equal;
when the first measured value is determined to be between the second resistance and the critical resistance, gating the second resistance, and calculating a final measured value of the sensor to be measured;
and when the first measured value is determined to be between the critical resistance and the third resistance, gating the third resistance, and calculating the final measured value of the sensor to be measured.
Optionally, the sensitivity calculation formula is:
wherein, U is the potential difference between the first fixed potential and the second fixed potential, and Rs is the real resistance of the sensor to be measured.
Optionally, the calculation formula of the critical resistance is as follows:
wherein R isiIs the resistance value of the second resistor, Ri+1Is the resistance of the third resistor.
Optionally, the resistance value measuring method of the resistive sensor further includes:
when the first measured value is determined to be smaller than the measuring resistor with the minimum resistance value in the measuring resistor unit, the measuring resistor with the minimum resistance value is gated as a divider resistor, and the final measured value of the sensor to be measured is calculated;
and when the first measured value is determined to be larger than the measured resistor with the largest resistance value in the measured resistor unit, gating the measured resistor with the largest resistance value as a divider resistor, and calculating the final measured value of the sensor to be measured.
The resistance value measuring device of the resistance sensor provided by the embodiment of the invention comprises a first selection switch unit, a measuring resistor unit, a connecting end of the sensor to be measured, a voltage measuring unit and a control calculation unit, wherein the control calculation unit controls the first selection switch unit to gate one measuring resistor in the measuring resistor unit as a divider resistor, and the resistance value of the measuring sensor is calculated according to the resistance value of the divider resistor. The invention can flexibly select the measuring resistor which is closer to the resistance value of the sensor to be measured as the divider resistor according to the resistance value of the sensor to be measured, thereby improving the measuring sensitivity of the resistance value of the sensor to be measured and improving the accuracy of the measured value of the gas concentration.
Drawings
The invention is explained in more detail below with reference to the figures and examples.
Fig. 1 is a schematic structural diagram of a resistance measuring device of a resistive sensor according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another resistance measuring device of a resistive sensor according to an embodiment of the present invention;
fig. 3 is a flowchart of a resistance measurement method of a resistance sensor according to a second embodiment of the present invention;
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
Fig. 1 is a schematic structural diagram of a resistance measuring device of a resistance sensor according to a first embodiment of the present invention, as shown in fig. 1, the resistance measuring device includes: the first selection switch unit 110, the measurement resistor unit 120, the to-be-measured sensor connection terminal 130, the voltage measurement unit 140, and the control calculation unit 150.
Wherein, the first terminal of the first selection switch unit 110 is used for providing the first fixed potential VRThe second terminal of the first selection switch unit 110 comprises at least two connection points for connecting to the measuring resistor.
The measuring resistor unit 120 includes at least two measuring resistors with different resistance values, for example, as shown in fig. 1, in this embodiment, the measuring resistor unit 120 includes n measuring resistors R with resistance values arranged from small to large in sequence1、R2......RnAnd forming a resistor array, wherein the resistance value of each measuring resistor is fixed, and n is more than or equal to 2. The first ends of the measuring resistors are respectively connected with the connection points of the second ends of the first selection switch units 110 in a one-to-one correspondence manner, and the second ends of the measuring resistors are connected with the connection end 130 of the sensor to be measured. Optionally, in the embodiment of the present invention, the selection switch unit 110 includes an analog switch with one out of multiple, and the signal link is turned off or on by using a switching manner of an MOS transistor, so as to gate one measurement resistor in the measurement resistor unit 120.
The sensor under test connection terminal 130 is used for connecting a first terminal of the sensor under test 160, and a second terminal of the sensor under test 160 is used for providing a second fixed potential V0So that the potential difference between the first terminal of the first selection switch unit 110 and the second terminal of the sensor to be measured 160 is: U-VR-V0. Illustratively, in one embodiment of the present invention, the second terminal of the sensor under test 160 is grounded, i.e., the second fixed potential V0Is at zero potential.
The first end of the voltage measurement unit 140 is connected to the connection end 130 of the sensor to be measured, the second end of the voltage measurement unit 140 is connected to the control calculation unit 150, and the voltage measurement unit 140 is configured to measure the voltage Uc of the sensor to be measured 160, that is, the potential difference Uc between the first end of the sensor to be measured 160 and the second end of the sensor to be measured 160, and transmit the voltage to the control calculation unit 150.
The third terminal of the first selection switch unit 110 is connected to the control and calculation unit 150, and the control and calculation unit 150 is configured to control the first selection switch unit 110 to gate one of the measurement resistors in the measurement resistor unit 120 as a voltage-dividing resistor, and calculate the resistance of the sensor to be measured 160 according to the resistance of the voltage-dividing resistor.
Specifically, the working principle of the resistance value measuring device of the resistance sensor is as follows:
the control and calculation unit 150 controls the first selection switch unit 110 to gate any one of the measuring resistors in the measuring resistor unit 120 as a voltage dividing resistor, and calculates a first measurement value R of the sensor 160 to be measured according to the resistance of the measuring resistorc1。
If the first measured value Rc1The measuring resistor R is smaller than the measuring resistor unit 120 with the smallest resistance value1Then control the computing unit 150 to gate R1And calculating the final measurement value of the sensor to be measured as a voltage dividing resistor.
If the first measured value Rc1The measuring resistor R is larger than the measuring resistor unit 120 with the largest resistance valuenThen control the computing unit 150 to gate RnAnd calculating the final measurement value of the sensor to be measured as a voltage dividing resistor.
If the first measured value Ri＜Rc1＜Ri+1Wherein R isiAnd Ri+1To measure two adjacent measured resistances in the resistance unit 120, R is determinedc1And HiIn the above-described relation, wherein,
when R isi≤Rc1≤HiIn time, the control calculation unit 150 gates RiAs a voltage dividing resistor, calculating a final measurement value of the sensor to be measured; when H is presenti≤Rc1≤Ri+1In time, the control calculation unit 150 gates Ri+1And calculating the final measurement value of the sensor to be measured as a voltage dividing resistor.
The resistance value measuring device of the resistance sensor provided by the embodiment of the invention comprises a first selection switch unit, a measuring resistor unit, a connecting end of the sensor to be measured, a voltage measuring unit and a control calculation unit, wherein the control calculation unit controls the first selection switch unit to gate one measuring resistor in the measuring resistor unit as a divider resistor, and the resistance value of the measuring sensor is calculated according to the resistance value of the divider resistor. The invention can flexibly select the measuring resistor which is closer to the resistance value of the sensor to be measured as the divider resistor according to the resistance value of the sensor to be measured, thereby improving the measuring sensitivity of the resistance value of the sensor to be measured and improving the accuracy of the measured value of the gas concentration.
Fig. 2 is a schematic structural diagram of another resistance value measuring device of a resistive sensor according to an embodiment of the present invention, as shown in fig. 2, optionally, based on the embodiment shown in fig. 1, the resistance value measuring device of the resistive sensor according to this embodiment further includes a second selection switch unit 170, a first end of the second selection switch unit 170 is connected to the connection end 130 of the sensor to be measured, a second end of the second selection switch unit 170 includes at least two connection points, and at least two sensors R to be measured include at least two connection pointss1、Rs2......RsnRespectively connected with the connection points of the second end of the second selection switch unit 170, and at least two sensors R to be measureds1、Rs2......RsnFor providing a second fixed potential V0。
The third end of the second selection switch unit 170 is connected to the control and calculation unit 150, and the control and calculation unit 150 controls the second selection switch unit 170 to gate one sensor to be tested. Exemplarily, in the embodiment of the present invention, the second selection switch unit 170 includes a one-out-of-multiple analog switch, and the signal link is turned off or on by using a switching manner of a MOS transistor, so as to gate at least two sensors R to be testeds1、Rs2......RsnAnd measuring the resistance value of the gated sensor to be measured. The resistance value measuring device of the resistance sensor in the embodiment can be connected to a plurality of sensors to be measured, and at least two sensors to be measured R are gated through the second selection switch units1、Rs2......RsnOne of the resistance value measuring devices is used for measuring the resistance value, so that the flexibility of the resistance sensor resistance value measuring device is improved.
Example two
A second embodiment of the present invention provides a resistance value measuring method of a resistance sensor, where the method is based on the resistance value measuring device of the first embodiment of the present invention, and fig. 3 is a flowchart of the resistance value measuring method of the resistance sensor provided by the second embodiment of the present invention, and as shown in fig. 3, the resistance value measuring method of the resistance sensor includes:
s201, gating the first resistor, and calculating a first measurement value of the sensor to be measured.
The first resistance is any one of the measuring resistance units. For example, the control and calculation unit 150 controls the first selection switch unit 110 to gate any one of the measuring resistors in the measuring resistor unit 120 as a voltage dividing resistor, and calculates the first measurement value R of the sensor 160 to be measured according to the resistance value of the measuring resistorc1. Illustratively, the gated measurement resistor R1As a voltage-dividing resistor, the first measured value R of the sensor to be measuredc1The calculation formula of (2) is as follows:
where Uc is the voltage of the sensor 160, i.e. the potential difference between the first end of the sensor 160 and the second end of the sensor 160, U is the potential difference between the first end of the first selection switch unit 110 and the second end of the sensor 160, and U ═ VR-V0，R1For measuring resistance R1The resistance value of (c).
And S202, determining a second resistance and a third resistance.
Exemplarily, the first measured value R is determinedc1The measuring resistor R is smaller than the measuring resistor unit 120 with the smallest resistance value1At this time, the measuring resistor closest to the resistance of the sensor to be measured is R1Therefore, the control calculation unit 150 controls the selection switch unit 110 to gate the measurement resistor R having the minimum resistance value1And (3) as a voltage dividing resistor, calculating a final measured value Rz of the sensor to be measured:
when it is determined that the first measured value is larger than the measured resistance R having the largest resistance value in the measured resistance unit 120nAt this time, the measuring resistor closest to the resistance of the sensor to be measured is R1The control and calculation unit 150 controls the selection switch unit 110 to gate the measurement resistor R with the maximum resistance valuenAnd (3) as a voltage dividing resistor, calculating a final measured value Rz of the sensor to be measured:
illustratively, when R is1≤Rc1≤RnWhile determining a first measured value Rc1Between those two measuring resistors. Wherein R is1For measuring the measuring resistor with the smallest resistance value in the resistor unit 120, RnThe measurement resistor having the largest resistance value in the measurement resistor unit 120 is used. I.e. the first measured value Rc1Greater than the second resistance RiIs less than the third resistor Ri+1Of a second resistor RiAnd a third resistor Ri+1Two measuring resistors having adjacent values in the measuring resistor unit 120 are used.
And S203, determining the critical resistance based on the second resistance and the third resistance.
When R is1≤Rc1≤RnThen the divider resistor will be driven from the second resistor RiAnd a third resistor Ri+1To select. When the first measured value R isc1Is relatively close to the second resistor RiThen, the second resistor R is selectediAs a voltage dividing resistor, when the first measured value Rc1Is relatively close to the third resistor Ri+1Then, the third resistor R is selectedi+1As a voltage dividing resistor, the best sensitivity is obtained. The problem is that when the first measurement value R is measuredc1In RiAnd Ri+1How to select the divider resistance when comparing the center position. Obviously, there is a critical resistance HiSuch that when R isc1＝HiThen, the second resistor R is selectediAnd a third Ri+1The sensitivity of the divider resistors is equal.
The critical resistance H is derived belowiThe calculation formula of (2).
By a voltage dividing resistor R1For example, the calculation of the sensitivity is explained. Sensor R to be measuredsWhen the resistance value of (1) is changed by Δ R, the sensitivity is improved by causing a change Δ V in the voltage Uc
Thus, the divider resistor is selected to be R1When the temperature of the water is higher than the set temperature,
therefore, the method comprises the following steps:
considering that Δ R at the denominator is an infinitesimal value, there are:
because of the following:
therefore, the method comprises the following steps:
when R is1＝RsIn the above formula, the equal or less signs may be equal signs.
There exists a critical resistance HiSuch that when R isc1＝HiThen, the second resistor R is selectediAnd a third resistor Ri+1The sensitivity of the divider resistors is equal.
Selecting a second resistance RiWhen the voltage-dividing resistor is used as the voltage-dividing resistor,
selecting a third resistor Ri+1When the voltage-dividing resistor is used as the voltage-dividing resistor,
let Delta Vi+1＝ΔViThen, there are:
the formula is simplified to obtain:
therefore, the method comprises the following steps:
to sum up, with H1，H2，...，HN-1And represents a series of resistance values. Their values are determined as follows:
and S204, when the first measured value is determined to be between the second resistance and the critical resistance, gating the second resistance, and calculating the final measured value of the sensor to be measured.
Illustratively, when R isi≤Rc1≤HiTime-gating resistor RiAs a voltage dividing resistor, the final measurement value of the sensor to be measured is calculated
And S205, when the first measured value is determined to be between the critical resistance and the third resistance, gating the third resistance, and calculating the final measured value of the sensor to be measured.
Exemplary, when Hi＜Rc1＜Ri+1Time-gating resistor Ri+1As a voltage dividing resistor, the final measurement value of the sensor to be measured is calculated
According to the resistance value measuring method of the resistance sensor, the control and calculation unit controls the first selection switch unit to gate any measuring resistor in the measuring resistor unit to serve as a divider resistor, and a first measuring value R of the sensor to be measured is calculated according to the resistance value of the measuring resistorc1(ii) a If the first measured value Rc1At the second resistor RiAnd a third resistor Ri+1In between, the first measured value R is judgedc1And a critical resistance HiIn the above-described relation, wherein,
when R isi≤Rc1≤HiTime, strobe RiAs a voltage dividing resistor, calculating a final measurement value of the sensor to be measured; when H is presenti≤Rc1≤Ri+1Time, strobe Ri+1And calculating the final measurement value of the sensor to be measured as a voltage dividing resistor. The invention can flexibly select the measuring resistor which is closer to the resistance value of the sensor to be measured as the divider resistor according to the resistance value of the sensor to be measured, thereby improving the measuring sensitivity of the resistance value of the sensor to be measured and improving the accuracy of the measured value of the gas concentration.
The embodiment of the invention also provides resistance value measuring equipment of the resistance-type sensor, which comprises the resistance value measuring device of the resistance-type sensor provided by the embodiment of the invention, and the resistance value measuring device of the resistance-type sensor can be integrated in the resistance value measuring equipment of the resistance-type sensor.
In the description herein, it is to be understood that the terms "upper", "lower", "right", and the like are based on the orientations and positional relationships shown in the drawings and are used for convenience in description and simplicity in operation, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be constructed in a particular operation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (9)
1. A resistive sensor resistance measurement device, comprising: the device comprises a first selection switch unit, a measuring resistor unit, a to-be-measured sensor connecting end, a voltage measuring unit and a control calculation unit; wherein the content of the first and second substances,
the first end of the first selection switch unit is used for providing a first fixed potential;
the measuring resistor unit comprises at least two measuring resistors with different resistance values, a first end of each measuring resistor is connected with a second end of the first selection switch unit, and a second end of each measuring resistor is connected with the connecting end of the sensor to be measured;
the connecting end of the sensor to be tested is used for connecting the first end of the sensor to be tested, and the second end of the sensor to be tested is used for providing a second fixed potential;
the first end of the voltage measuring unit is connected with the connecting end of the sensor to be measured, the second end of the voltage measuring unit is connected with the control computing unit, and the voltage measuring unit is used for measuring the voltage of the sensor to be measured and transmitting the voltage to the control computing unit;
the third end of the first selection switch unit is connected with the control calculation unit, and the control calculation unit is used for controlling the first selection switch unit to gate one measuring resistor in the measuring resistor unit as a divider resistor and calculate the resistance value of the sensor to be measured;
the resistance value measuring device of the resistance sensor is specifically used for:
gating a first resistor, and calculating a first measured value of the sensor to be measured, wherein the first resistor is any one measuring resistor in the measuring resistor unit;
determining a second resistor and a third resistor, wherein the first measured value is larger than the resistance value of the second resistor and smaller than the resistance value of the third resistor, and the second resistor and the third resistor are two adjacent measuring resistors with the resistance values in the measuring resistor unit;
and determining a critical resistance based on the second resistance and the third resistance, wherein the critical resistance is a measured value of the sensor to be measured calculated when the second resistance or the third resistance is switched on as a voltage dividing resistance and the measuring sensitivities are equal.
2. The resistance value measuring device according to claim 1, further comprising a second selection switch unit, wherein a first end of the second selection switch unit is connected to the connecting end of the sensor to be measured, a second end of the second selection switch unit is connected to at least two sensors to be measured, a third end of the second selection switch unit is connected to the control and calculation unit, and the second selection switch unit is configured to gate one sensor to be measured.
3. The resistance measuring device according to claim 1, wherein the first selection switch unit and the second selection switch unit are analog switches for one out of multiple ones.
4. The resistance measuring device of claim 1, wherein the second terminal of the sensor under test is grounded.
5. A gas detection apparatus comprising the resistive sensor resistance value measurement device according to any one of claims 1 to 4.
6. A resistance value measuring method of a resistive sensor according to any one of claims 1 to 4, the method comprising:
gating a first resistor, and calculating a first measured value of the sensor to be measured, wherein the first resistor is any one measuring resistor in the measuring resistor unit;
determining a second resistor and a third resistor, wherein a first measured value is larger than the resistance value of the second resistor and smaller than the resistance value of the third resistor, and the second resistor and the third resistor are two adjacent measuring resistors with the resistance values in the measuring resistor unit;
determining a critical resistance based on the second resistance and the third resistance, wherein the critical resistance is a measured value of the sensor to be measured calculated when the second resistance or the third resistance is switched on as a voltage dividing resistance and the measuring sensitivities are equal;
when the first measured value is determined to be between the second resistance and the critical resistance, gating the second resistance, and calculating a final measured value of the sensor to be measured;
and when the first measured value is determined to be between the critical resistance and the third resistance, gating the third resistance, and calculating the final measured value of the sensor to be measured.
7. The resistance value measuring method of a resistive sensor according to claim 6, wherein the sensitivity is calculated by the formula:
wherein, U is the potential difference between the first fixed potential and the second fixed potential, and Rs is the real resistance of the sensor to be measured.
8. The resistance value measuring method according to claim 6, wherein the calculation formula of the critical resistance is:
wherein R isiIs the resistance value of the second resistor, Ri+1Is the resistance of the third resistor.
9. The resistance value measuring method of a resistive sensor according to claim 6, further comprising:
when the first measured value is determined to be smaller than the measuring resistor with the minimum resistance value in the measuring resistor unit, the measuring resistor with the minimum resistance value is gated as a divider resistor, and the final measured value of the sensor to be measured is calculated;
and when the first measured value is determined to be larger than the measured resistor with the largest resistance value in the measured resistor unit, gating the measured resistor with the largest resistance value as a divider resistor, and calculating the final measured value of the sensor to be measured.
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