CN112229379B - Electrolyte fan cylinder shape variable inclination angle tester - Google Patents

Electrolyte fan cylinder shape variable inclination angle tester Download PDF

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Publication number
CN112229379B
CN112229379B CN202011021700.0A CN202011021700A CN112229379B CN 112229379 B CN112229379 B CN 112229379B CN 202011021700 A CN202011021700 A CN 202011021700A CN 112229379 B CN112229379 B CN 112229379B
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electrolyte
inclination angle
bridge arm
outer cylinder
bridge
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CN112229379A (en
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孙冬
吴明康
聂子健
蔡纪源
王顺华
李璟
殷家腾
高燕
顾斌
张照锋
吴珊珊
汤滟
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Shandong Tianhe New Materials Co.,Ltd.
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Nanjing College of Information Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C9/00—Measuring inclination, e.g. by clinometers, by levels
    • G01C9/18—Measuring inclination, e.g. by clinometers, by levels by using liquids
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C9/00—Measuring inclination, e.g. by clinometers, by levels
    • G01C9/18—Measuring inclination, e.g. by clinometers, by levels by using liquids
    • G01C2009/182—Measuring inclination, e.g. by clinometers, by levels by using liquids conductive

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Abstract

The invention relates to the field of angle detection, in particular to an electrolyte fan cylindrical variable inclination angle tester, which comprises a liquid container, a mounting body and a signal processing device, wherein the mounting body is arranged on the liquid container; the liquid container comprises an outer cylinder and an inner cylinder which are coaxial; a liquid containing cavity is formed between the outer cylinder and the inner cylinder; electrolyte is injected into the liquid containing cavity, and the volume of the electrolyte occupies half of the volume of the liquid containing cavity; arranging an insulating isolation plate on the axial section of the outer cylinder, wherein the insulating isolation plate is bounded by two end faces of an inner cylinder bus, an outer cylinder bus and an outer cylinder; the front end of the insulating isolation plate is provided with a first left electrode and a first right electrode, and the rear end of the insulating isolation plate is provided with a second left electrode and a second right electrode; the lower surface of the mounting body is used for being attached to a measured plane, the liquid container is arranged on the mounting body, and the insulating isolation plate is vertical to the lower surface of the mounting body; four resistors form a bridge arm, and the change of the inclination angle is measured by using the change of the resistors. The invention has the advantages of few structural components, low cost, convenient operation and high measurement precision.

Description

Electrolyte fan cylinder variable inclination angle tester
Technical Field
The invention relates to the field of angle detection, in particular to an electrolyte fan cylindrical variable inclination angle tester.
Background
Angle or inclination measurement is often required in industrial and agricultural production and service, scientific research and daily life, for example in the fields of equipment installation, machining, building construction and transportation. However, the current angle measuring instrument generally has the defects of low precision or low cost performance, and the invention aims to solve the problem.
Disclosure of Invention
The invention aims to provide a dip angle tester with higher automation degree based on an electrical principle, which achieves the design goal of obtaining higher detection precision under the constraint conditions of fewer components, low cost and simple and convenient operation.
In order to solve the above technical problems, the basic idea of the technical scheme of the invention is as follows: electrolyte is injected into the fan column body, and the object inclines to cause the electrolyte to flow so as to cause the fan column body to deform, thereby generating the change of resistance. The invention comprises a liquid container, a mounting body and a signal processing device;
the liquid container comprises an outer cylinder and an inner cylinder which are coaxial, the outer cylinder extends from front to back and is hollow, the inner cylinder is arranged in the outer cylinder and extends to the front end and the rear end of the liquid container, and the inner cylinder is an insulator; a liquid containing cavity is formed between the outer cylinder and the inner cylinder; electrolyte with certain conductivity is injected into the liquid containing cavity, and the volume of the electrolyte occupies half of the volume of the liquid containing cavity; arranging an insulating isolation plate on the axial section of the outer cylinder, wherein the insulating isolation plate is bounded by two end faces of an inner cylinder bus, an outer cylinder bus and an outer cylinder; the front end of the insulating isolation plate is provided with a first left electrode and a first right electrode which are positioned at the left side and the right side of the insulating isolation plate and are symmetrical in position, the rear end of the insulating isolation plate is provided with a second left electrode and a second right electrode which are positioned at the left side and the right side of the insulating isolation plate and are symmetrical in position; the electrolyte occupied part in the liquid containing cavity is divided into a left cavity and a right cavity by an insulating partition plate;
the lower surface of the mounting body is used for being attached to a measured plane, the liquid container is arranged on the mounting body, and the insulating isolation plate is vertical to the lower surface of the mounting body;
the signal detection processing device comprises an electric bridgeThe system comprises a formula signal detector, a signal processor and a signal output unit; the bridge signal detector adopts a Wheatstone bridge and comprises a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm, wherein the positive pole of a power supply is connected with the first bridge arm and the second bridge arm and then connected with the negative pole of the power supply, the positive pole of the power supply is connected with the third bridge arm and the fourth bridge arm and then connected with the negative pole of the power supply, the first bridge arm is provided with a fixed resistor R 1 The second bridge arm is provided with a fixed resistor R 2 A first left detection input end connected with the first left electrode and a second left detection input end connected with the second left electrode are arranged on the third bridge arm, and a first right detection input end connected with the first right electrode and a second right detection input end connected with the second right electrode are arranged on the fourth bridge arm; the cross section of the electrolyte contained in the left cavity and the right cavity is fan-shaped, the contained electrolyte forms a fan-shaped column body, and a variable resistor R is formed between the first left electrode and the second left electrode on the left side of the insulating isolation plate Left side of A variable resistor R is formed between the first right electrode and the second right electrode on the right side of the insulating isolation plate Right side (ii) a The middle node of the first bridge arm and the second bridge arm is a first detection output end, and the middle node of the third bridge arm and the fourth bridge arm is a second detection output end;
the input end of the signal processor is connected with the first detection output end and the second detection output end; the inclination angle theta is an included angle between the lower surface of the mounting body and the horizontal plane; the cross-sectional area of the electrolyte fan cylinder changes along with the change of the inclination angle theta, so that the detection voltage between the first detection output end and the second detection output end of the Wheatstone bridge changes, and the voltage is collected and processed by the signal processor and then the measurement result of the inclination angle theta is output through the signal output unit.
According to the scheme, the signal processor comprises a signal conditioner, an analog-to-digital converter and a microprocessor which are connected in sequence; the input end of the signal conditioner is connected with the first detection output end and the second detection output end;
the signal conditioner is used for carrying out signal following, amplification and filtering and comprises a follower, a variable gain amplifier and a filter which are sequentially connected;
the analog-to-digital converter is used for carrying out binary quantization;
and the microprocessor is used for detecting the inclination angle theta.
According to the scheme, in the microprocessor of the signal processor, the following detection formula is adopted for detecting the inclination angle theta:
Figure GDA0003751508510000021
wherein, V CC Representing bridge supply voltage, U ADC Representing the input voltage of ADC, G representing the linear amplification of the output voltage of bridge by VGA, controlled by the output code of microprocessor, and used for automatic gear shifting of different inclination angle measurements, and Δ U representing fixed resistor R 2 Voltage across and variable resistance R Right side The voltage difference between the two ends, i.e. the detection voltage of the bridge output, is dependent on the ratio R of the resistance values of the electrolytes contained in the left and right chambers Left side of /R Right side As shown in the following formula:
Figure GDA0003751508510000022
wherein, V CC Representing the bridge supply voltage, U ADC Representing the input voltage of ADC, G representing the linear amplification of the output voltage of bridge by Variable Gain Amplifier (VGA) in signal conditioner, controlled by the output code of Microprocessor (MPU) of signal processor for automatic gear shifting of different tilt angle measurement, and Δ U representing fixed resistor R 2 Voltage across and variable resistance R Right side The voltage difference between the two ends, i.e. the detection voltage of the bridge output, is dependent on the ratio R of the resistance values of the electrolytes contained in the left and right chambers Left side of /R Right side As shown in the following formula:
Figure GDA0003751508510000023
according to the scheme, in order to realize automatic gear shifting for different inclination angle measurement and control the input voltage of the analog-to-digital converter to be in the optimal linear section of the analog-to-digital converter, the optimal linear end is positioned at the half position of the full scale, and the microprocessor adopts the following gear shifting control flow:
step 1), the following steps: g ← 0;
step 2), the step of: acquisition U ADC ＝GΔU；
Step 3), the step of: judging whether | U is satisfied ADC -U max /2|<U thd If not, executing G ← G + Δ G, and entering the step 2), and if yes, entering the next step;
step 4), the step of: outputting a control code of a G value to the variable gain amplifier VGA;
wherein, U max For the full scale voltage of the ADC, Δ G is the step value of the gain, U thd Is a threshold for the voltage difference, if the difference between the two voltages is below the threshold U thd The two voltages are considered equal.
According to above scheme, the installation body is rectangle cavity structure, and outer cylinder is located rectangle cavity structure and just insulating division board is mutually perpendicular with rectangle cavity structure lower surface.
According to the scheme, the radius of the inner cylinder is far smaller than that of the outer cylinder.
According to the scheme, the signal output unit comprises a display and/or a loudspeaker which are connected to the output end of the signal processor and used for broadcasting the measuring result.
According to the scheme, the input end of the signal processor is provided with a keyboard for a user to input data.
The invention has the following beneficial effects: in the invention, the inclination angle theta is defined as the included angle between the lower surface of the mounting body and the horizontal plane; the bridge-type signal detector comprises four resistors to form a bridge arm, wherein a variable resistor R Left side of And R Right side The change of the inclination angle is measured by using the change of the resistance of the two bridge arms, and the detection sensitivity is higher. The change causes a change in the detected voltage between the first and second detection outputs of the Wheatstone bridge, which is followed by the signal conditioner: (After the processing processes of reducing the influence of load on the accuracy of the bridge), amplifying (further increasing the detection sensitivity) and filtering (reducing the influence of noise on the measurement accuracy), outputting the data to an analog-to-digital converter (ADC) for binary quantization, calculating and processing the quantized data after the quantized data is collected by a microprocessor, and finally broadcasting the measurement result of the inclination angle theta by a display or a loudspeaker;
in addition, compared with the prior art, the invention has the following advantages:
the structure design is ingenious, and the design target of obtaining higher detection precision under the constraint conditions of fewer components, low cost and simple and convenient operation is achieved;
and secondly, the linear relation between the detected physical quantity and the detected voltage is theoretically achieved, so that in practice, even if a low-cost instrument amplifier is adopted in the signal conditioner and complicated linearization processing is not carried out in subsequent data processing, higher linearity can be achieved.
And thirdly, advanced shift flow control is realized, automatic shift for different inclination angle measurement can be realized, and the input voltage of the analog-to-digital converter is controlled in the optimal linear section (located near half of the full scale range) of the ADC, so that the nonlinearity of the analog-to-digital converter has little influence on the measurement linearity even if the analog-to-digital converter with low cost is adopted.
Drawings
FIG. 1 is a schematic view of an appearance structure of a liquid container and a mounting body according to an embodiment of the present invention;
FIG. 2 is a schematic view of the internal structure of the liquid container in this embodiment;
FIG. 3 is a schematic end view of the liquid container of this embodiment when laid flat;
FIG. 4 is a schematic end view of the liquid container of this embodiment when tilted to the right;
FIG. 5 shows the formation of a resistor R in this embodiment Left side of The electrolyte fan column body schematic diagram of (1);
FIG. 6 is a schematic diagram of a bridge signal detector according to the present embodiment;
FIG. 7 is a block diagram illustrating the overall structure and signal flow of the signal processing apparatus in this embodiment;
fig. 8 is a shift control flowchart in the present embodiment.
Reference numerals: 1. an outer cylinder; 2. an inner cylinder; 3. an electrolyte; 301. a left chamber electrolyte; 302. right chamber electrolyte; 4. an insulating separator plate; 5. a first left electrode; 6. a first right electrode; 7. a second left electrode; 8. a second right electrode; 9. an installation body; 10. a bridge signal detector; 11. a signal processor; 12. a signal output unit; 13. a keyboard.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 8, the present invention is an electrolyte fan-cylinder-shaped inclination angle tester, referring to fig. 1, the direction indicated by arrow F is defined as the front in the present embodiment; the variable inclination angle tester for the electrolyte fan cylinder comprises a liquid container, a mounting body and a signal processing device.
The liquid container comprises an outer cylinder and an inner cylinder which are coaxial, the outer cylinder extends from front to back and is hollow, the outer cylinder is a hollow insulator, and the radius of the outer cylinder is R _ out; the inner cylinder is arranged in the outer cylinder and extends to the front end and the rear end of the liquid container, the inner cylinder is a solid insulator, the radius of the inner cylinder is R _ in, and the radius of the outer cylinder and the radius of the inner cylinder meet R _ in < < R _ out; a liquid containing cavity is formed between the outer cylinder and the inner cylinder; the lower surface of the mounting body is used for being attached to a measured plane, in the embodiment, the mounting body is of a rectangular cavity structure, the liquid container is arranged in the mounting body, namely an outer cylinder and an inner cylinder which are coaxial are sealed in the rectangular cavity structure, and the front end and the rear end of the outer cylinder are in contact with the inner wall of the mounting body; the inclination angle theta is defined as the included angle between the lower surface of the mounting body, namely the bottom surface of the rectangular cavity structure, and the horizontal plane.
Electrolyte with certain conductivity is injected into the liquid containing cavity, and the volume of the electrolyte occupies half of the volume of the liquid containing cavity; arranging an insulating isolation plate on the axial section of the outer cylinder, wherein the insulating isolation plate is bounded by two end faces of the inner cylinder bus, the outer cylinder bus and the outer cylinder, is rectangular and is perpendicular to the lower surface of the rectangular cavity structure; the front end of the insulating isolation plate is provided with a first left electrode and a first right electrode which are positioned at the left side and the right side of the insulating isolation plate and are symmetrical in position, the rear end of the insulating isolation plate is provided with a second left electrode and a second right electrode which are positioned at the left side and the right side of the insulating isolation plate and are symmetrical in position; the electrolyte occupied part in the liquid containing cavity is divided into two sub-cavities by an insulating partition plate, namely a left cavity and a right cavity, and the electrolyte in the liquid containing cavity forms electrolyte in the left cavity and electrolyte in the right cavity; in this embodiment, the first left electrode, the first right electrode, the second left electrode, and the second right electrode are all gold-plated electrodes to prevent corrosion by the electrolyte.
If the installation body is horizontally placed, namely theta is 0, the electrolyte in the left cavity and the electrolyte in the right cavity are equally distributed; if the installation body has an inclination angle with the horizontal plane, namely theta is not equal to 0, the electrolyte in the left cavity and the electrolyte in the right cavity are distributed unevenly. The cross sections of the left cavity and the right cavity are fan-shaped, the contained electrolyte, namely the electrolyte of the left cavity and the electrolyte of the right cavity, form a fan-shaped column body, the fan-shaped column body is led out by a pair of electrodes on the same surface of the insulating isolation plate, a resistor is formed between the two electrodes, the sum of the resistors between the two pairs of electrodes is a constant, and the ratio R of the resistors is Left side of /R Right side Equal to the ratio of the cross-sectional areas of the corresponding fan cylinders, as shown in fig. 4, the ratio of the cross-sectional areas of the fan cylinders formed by the electrolyte in the left and right cavities has a functional relationship with the current inclination angle, so that the ratio R of the resistances Left side of /R Right side And the current inclination angle theta. And respectively leading out the left and right pairs of electrodes to a signal processing device by using a lead, wherein a linear relation also exists between the detection voltage delta U and the inclination angle theta.
The signal detection processing device comprises a bridge type signal detector, a signal processor and a signal output unit; referring to fig. 6, the bridge signal detector is a wheatstone bridge, and includes a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm, wherein a positive electrode of a power supply is connected to a negative electrode of the power supply after being connected to the first bridge arm and the second bridge arm, a positive electrode of the power supply is connected to a negative electrode of the power supply after being connected to the third bridge arm and the fourth bridge arm, and a fixed resistor R is disposed on the first bridge arm 1 The second bridge arm is provided with a fixed resistor R 2 The third bridge arm is provided with a first left detection input end connected with the first left electrode and a second left detection input end connected with the second left electrodeA fourth bridge arm is provided with a first right detection input end connected with the first right electrode and a second right detection input end connected with the second right electrode; a variable resistor R is formed between the first left electrode and the second left electrode on the left side of the insulating isolation plate Left side of A variable resistor R is formed between the first right electrode and the second right electrode on the right side of the insulating isolation plate Right side (ii) a The middle node of the first bridge arm and the second bridge arm is a first detection output end, and the middle node of the third bridge arm and the fourth bridge arm is a second detection output end;
the signal processing device also comprises a signal conditioner for signal following, amplification and filtering, an analog-to-digital converter for binary quantization and a keyboard for a user to input data;
the signal processor comprises a signal conditioner, an analog-to-digital converter and a microprocessor which are connected in sequence; the input end of the signal conditioner is connected with the first detection output end and the second detection output end; the signal conditioner is used for carrying out signal following, amplification and filtering and comprises a follower, a variable gain amplifier and a filter which are sequentially connected; the analog-to-digital converter is used for carrying out binary quantization; the microprocessor is used for detecting the inclination angle theta;
the output end of the analog-to-digital converter is connected with the input end of the microprocessor; the keyboard is connected to the microprocessor. The signal output unit comprises a display and/or a loudspeaker which are connected with the output end of the signal processor and used for broadcasting the measuring result.
In this embodiment, the inclination angle θ is an included angle between the lower surface of the mounting body and the horizontal plane; the bridge type signal detector forms a bridge arm through four resistors, and the change of the inclination angle is measured by utilizing the change of the resistors; variable resistor R Left side of And R Right side The change of the cross section area of the fan column body formed by the left cavity electrolyte and the right cavity electrolyte causes the linear change of the detection voltage delta U between the first detection output end and the second detection output end of the Wheatstone bridge, the voltage is output to an analog-to-digital converter (ADC) for binary quantization after the following, amplification and filtering processing processes of the voltage are carried out by a signal conditioner, and the quantized data are collected by a microprocessor and then enter the ADCCalculating, and finally broadcasting a measurement result of the inclination angle theta by a display or a loudspeaker; the microprocessor can adopt a singlechip.
In this embodiment, the algorithm principle of the signal processing apparatus for measuring the tilt angle θ is described as follows:
suppose a flow through R 1 And R 2 Current of bridge arm is I 1 Through R Left side of And R Right side Current of bridge arm is I 2 Bridge supply voltage is V CC Refer to fig. 6; because the first stage of the subsequent signal conditioner adopts the follower to follow the signal, the load resistance value between the first detection output end and the second detection output end is far greater than the resistance value of the bridge arm, the load current can be ignored, and R 1 And R 2 The two bridge arms will be V CC Voltage division, R 2 The resulting voltage across the resistor is denoted as U 2 ；R Left side of And R Right side These two arms will also be V CC Voltage division, R Right side The resulting voltage across the resistor is denoted as U Right side 。
R 2 Voltage U across 2 As shown in equation (1):
Figure GDA0003751508510000061
R right side Voltage U across Right side As shown in equation (2):
Figure GDA0003751508510000062
U 2 and U Right side The voltage difference Δ U is a detection voltage, and Δ U is obtained by subtracting the formula (1) and the formula (2), as shown in the formula (3):
Figure GDA0003751508510000063
as can be seen from equation (3), if the resistances of the four arms are equal, Δ U is equal to 0, and the bridge is in balanceThe state, the correctness of formula (3) is verified to a certain extent; if R is Left side of And R Right side The ratio of (a) changes, which results in a change in the detected output voltage Δ U.
R can be determined based on the formula (3) Left side of /R Right side Expressed as Δ U, as shown in equation (4):
Figure GDA0003751508510000064
based on the principle that a uniform geometric body with a certain resistivity and length has a resistance value inversely proportional to the cross-sectional area, the following formula (5) can be obtained by observing and analyzing fig. 4:
Figure GDA0003751508510000071
wherein A is Left side of And A Right side The cross-sectional areas of the fan-shaped columns formed by the electrolyte in the left cavity and the electrolyte in the right cavity are respectively shown.
Simultaneous equations (4) and (5), elimination of R Left side of /R Right side The relationship of the inclination angle θ and the detection voltage Δ U as shown in equation (6) is obtained:
Figure GDA0003751508510000072
as shown in fig. 7, if Δ U is linearly amplified by G times in the signal conditioner, equation (7) exists:
G·ΔU＝U ADC (7)
wherein U is ADC Representing the input voltage of the ADC.
Substituting the formula (7) into the formula (6) to obtain a detection formula of the inclination angle theta, as shown in the formula (8):
Figure GDA0003751508510000073
equation (8) shows that the tilt angles θ and U are theoretically ADC The design achieves the linearity index in theory and practice by adopting a high-linearity amplifier in a signal conditioner. In addition, the formula (8) shows that by setting larger G and V cc The value can obtain higher detection sensitivity and precision.
In a general design, let R 1 ＝R 2 R, a simpler detection formula of the inclination angle θ is obtained, as shown in formula (9):
Figure GDA0003751508510000074
in addition, in order to realize automatic gear shifting for different tilt angle measurements and control the input voltage of the ADC to the optimal linear segment of the ADC (located near half of full scale), the following gear shifting control procedure is adopted:
step 1), the following steps: g ← 0;
step 2), the step of: acquisition U ADC ＝GΔU；
Step 3), the step of: judging whether | U is satisfied ADC -U max /2|<U thd If not, executing G ← G + Δ G, and entering the step 2), and if yes, entering the next step;
step 4), the step of: outputting a control code of a G value to the variable gain amplifier VGA;
wherein, U max For the full scale voltage of the ADC, Δ G is the step value of the gain, U thd Is a threshold for the voltage difference, if the difference between the two voltages is below the threshold U thd The two voltages are considered equal.
The non-related parts of the present invention are the same as or implemented using the prior art.
The foregoing is a more detailed description of the present invention with reference to specific embodiments thereof, and it is not intended to limit the invention to the specific embodiments thereof. For those skilled in the art to which the invention pertains, numerous simple deductions or substitutions may be made without departing from the spirit of the invention, which shall be deemed to belong to the scope of the invention.

Claims (8)

1. Electrolyte fan column form becomes inclination tester, its characterized in that: comprises a liquid container, an installation body and a signal processing device;
the liquid container comprises an outer cylinder and an inner cylinder which are coaxial, the outer cylinder extends from front to back and is hollow, the inner cylinder is arranged in the outer cylinder and extends to the front end and the rear end of the liquid container, and the inner cylinder is an insulator; a liquid containing cavity is formed between the outer cylinder and the inner cylinder; electrolyte with certain conductivity is injected into the liquid containing cavity, and the volume of the electrolyte occupies half of the volume of the liquid containing cavity; arranging an insulating isolation plate on the axial section of the outer cylinder, wherein the insulating isolation plate is bounded by two end faces of an inner cylinder bus, an outer cylinder bus and an outer cylinder; the front end of the insulating isolation plate is provided with a first left electrode and a first right electrode which are positioned at the left side and the right side of the insulating isolation plate and are symmetrical in position, the rear end of the insulating isolation plate is provided with a second left electrode and a second right electrode which are positioned at the left side and the right side of the insulating isolation plate and are symmetrical in position; the electrolyte occupied part in the liquid containing cavity is divided into a left cavity and a right cavity by an insulating partition plate;
the lower surface of the mounting body is used for being attached to a measured plane, the liquid container is arranged on the mounting body, and the insulating isolation plate is vertical to the lower surface of the mounting body;
the signal detection processing device comprises a bridge type signal detector, a signal processor and a signal output unit; the bridge signal detector adopts a Wheatstone bridge and comprises a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm, wherein the positive pole of a power supply is connected with the first bridge arm and the second bridge arm and then connected with the negative pole of the power supply, the positive pole of the power supply is connected with the third bridge arm and the fourth bridge arm and then connected with the negative pole of the power supply, the first bridge arm is provided with a fixed resistor R 1 The second bridge arm is provided with a fixed resistor R 2 A first left detection input end connected with the first left electrode and a second left detection input end connected with the second left electrode are arranged on the third bridge arm, and a first right detection input end connected with the first right electrode and a second right detection input end connected with the second right electrode are arranged on the fourth bridge arm; cross section of electrolyte contained in left cavity and right cavityThe electrolyte contained in the fan-shaped insulating partition plate forms a fan-shaped column body, and a variable resistor R is formed between the first left electrode and the second left electrode on the left side of the insulating partition plate Left side of A variable resistor R is formed between the first right electrode and the second right electrode on the right side of the insulating isolation plate Right side (ii) a The middle node of the first bridge arm and the second bridge arm is a first detection output end, and the middle node of the third bridge arm and the fourth bridge arm is a second detection output end;
the input end of the signal processor is connected with the first detection output end and the second detection output end; the inclination angle theta is an included angle between the lower surface of the mounting body and the horizontal plane; the cross section area of the electrolyte fan column body changes along with the change of the inclination angle theta, so that the detection voltage between the first detection output end and the second detection output end of the Wheatstone bridge changes, and the voltage is collected and processed by the signal processor and then the measurement result of the inclination angle theta is output through the signal output unit;
detection formula of the inclination angle theta:
Figure FDA0003751508500000011
the formula shows that the dip angles theta and U are theoretically ADC The linear relation is formed; v CC Representing the bridge supply voltage, U ADC Representing the input voltage of the analog-to-digital converter ADC; g represents the linear amplification factor of the variable gain amplifier VGA in the signal conditioner to the output voltage of the bridge.
2. The electrolyte fan-column-shaped variable inclination angle tester according to claim 1, characterized in that: the signal processor comprises a signal conditioner, an analog-to-digital converter and a microprocessor which are connected in sequence; the input end of the signal conditioner is connected with the first detection output end and the second detection output end;
the signal conditioner is used for carrying out signal following, amplification and filtering and comprises a follower, a variable gain amplifier and a filter which are connected in sequence;
the analog-to-digital converter is used for carrying out binary quantization;
and the microprocessor is used for detecting the inclination angle theta.
3. The electrolyte fan-column-shaped variable inclination angle tester according to claim 2, characterized in that: in the microprocessor of the signal processor, the linear amplification factor G of the variable gain amplifier VGA in the signal processor to the output voltage of the bridge is controlled by the output code of the microprocessor of the signal processor, and is used for realizing automatic gear shifting of different inclination angle measurements, and Delta U represents a fixed resistor R 2 Voltage across and variable resistance R Right side The voltage difference between the two ends, i.e. the detection voltage of the bridge output, is dependent on the ratio R of the resistance values of the electrolytes contained in the left and right chambers Left side of /R Right side As shown in the following formula:
Figure FDA0003751508500000021
4. the electrolyte fan-column-shaped variable inclination angle tester according to claim 3, characterized in that: in order to realize automatic gear shifting for different inclination angle measurement and control the input voltage of the analog-to-digital converter in the optimal linear section of the analog-to-digital converter, the optimal linear end is positioned at the half position of the full scale, and the microprocessor adopts the following gear shifting control flow:
step 1), the following steps: g ← 0;
step 2), the step of: acquisition U ADC ＝GΔU；
Step 3), the step of: judging whether | U is satisfied ADC -U max /2|<U thd If not, executing G ← G + Δ G, and entering the step 2), and if yes, entering the next step;
step 4), the step of: outputting a control code of a G value to the variable gain amplifier VGA;
wherein, U max For the full scale voltage of the ADC, Δ G is the step value of the gain, U thd Is the threshold of the voltage difference, if the difference between the two voltages is lower than the threshold U thd The two voltages are considered equal.
5. The electrolyte fan-column-shaped variable inclination angle tester according to claim 1, characterized in that: the installation body is a rectangular cavity structure, the outer cylinder is located in the rectangular cavity structure, and the insulating isolation plate is perpendicular to the lower surface of the rectangular cavity structure.
6. The electrolyte fan-column-shaped variable inclination angle tester according to claim 1, characterized in that: the radius of the inner cylinder is much smaller than the radius of the outer cylinder.
7. The electrolyte fan-column-shaped variable inclination angle tester according to claim 1, characterized in that: the signal output unit comprises a display and/or a loudspeaker connected to the output end of the signal processor and used for broadcasting the measuring result.
8. The electrolyte fan-column-shaped variable inclination angle tester according to claim 1, characterized in that: and the input end of the signal processor is provided with a keyboard for a user to input data.
CN202011021700.0A 2020-09-25 2020-09-25 Electrolyte fan cylinder shape variable inclination angle tester Active CN112229379B (en)

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GB2186693B (en) * 1986-01-23 1990-09-05 Duracell Int Inclination sensor
JP2000055655A (en) * 1998-08-03 2000-02-25 Tokai Rika Co Ltd Double-axis type inclination sensor
CN101349738B (en) * 2008-08-27 2011-05-18 福建师范大学 Method and apparatus for real time monitoring tandem type accumulator battery voltage
CN104034256B (en) * 2014-04-28 2016-08-24 哈尔滨工业大学 Concentric coplanar quartering ring-fourth class cyclotomy nesting pole plate inclination angle measurement method and device
CN109839098A (en) * 2017-11-29 2019-06-04 湖南科技学院 A kind of U-tube horizon detector
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