CN103808303A

CN103808303A - Spherical surface capacitive type plane level detection sensor

Info

Publication number: CN103808303A
Application number: CN201410080295.8A
Authority: CN
Inventors: 刘志壮; 张文昭
Original assignee: Hunan University of Science and Engineering
Current assignee: Hunan University of Science and Engineering
Priority date: 2014-03-06
Filing date: 2014-03-06
Publication date: 2014-05-21

Abstract

The invention relates to a spherical surface capacitive type plane level detection sensor. The spherical surface capacitive type plane level detection sensor consists of a plastic spherical surface (1), a fixing electrode A (2), a fixing electrode B (3), a fixing electrode C (4), a liquid-state movable electrode (5) and a base (6), wherein the plastic spherical surface (1) is a hollow spherical surface and is internally provided with a half capacity of conductive liquid to form the liquid-state movable electrode (5); the outer surface of the plastic spherical surface (1) is longitudinally divided into trisection spherical surfaces; each of the one third spherical surfaces is provided with a metal film in a plating manner, so that the three fixing electrodes are formed; the three fixing electrodes are mutually insulated; the three fixing electrodes and the liquid-state movable electrode (5) form three changeable capacitors; when the base is arranged on a horizontal surface, the capacities of the three capacitors are equal; when a plane is inclined, the capacities of the three capacitors are changed, the position of the surface with the enlarged capacity is low, and the position of the surface with the reduced capacity is high, so that the level of the plane can be judged.

Description

A kind of sphere condenser type planar horizontal detecting sensor

Technical field

The present invention relates to sensing, machinery, instrument and manufacturing technology, refer in particular to for the whether horizontal electrolevel of measurement plane.

Background technology

Traditional level meter is air bubble type level meter, and air bubble type level meter mainly relies on the side-play amount in bubble offsetting level centre position to carry out the unevenness in a certain region, measuring workpieces surface.Its defect is: air bubble type level meter is very sensitive to temperature, and along with the rising of temperature, bubble length changes, and the size of bubbler tube inner chamber also changes, and causes apparatus measures error to increase; Secondly, the each workplace of air bubble type level meter will be before use whether carry out the zero-bit of determined level instrument according to the position of bubble accurate, and can only measure the horizontality of limited direction, can not detect the angle of inclination; Moreover whether tested planar horizontal obtains with the departure degree of zero-bit by eyes observation level bubble phase pair, testing result has artificial property.

Summary of the invention

The present invention designs a kind of sphere condenser type planar horizontal detecting sensor, for level meter electronization creates conditions, solves traditional bubble and scale sensitivity, degree of accuracy is low, can not carry out the deficiency that numeral shows.

Solving technical scheme of the present invention is, a kind of sphere condenser type planar horizontal detecting sensor, by plastics sphere (1), fixed electorde A(2), fixed electorde B(3), fixed electorde C(4), liquid moving electrode (5) forms; Plastics sphere (1) becomes hollow ball shape, inner sealing the conduction liquid that half capacity is housed form liquid moving electrode (5), plastics sphere (1) outside surface from being longitudinally divided into trisection sphere, each equal portions sphere plates metal film and forms respectively fixed electorde A(2), fixed electorde B(3), fixed electorde C(4), mutually insulated between three fixed electordes, form three variable condenser with liquid moving electrode (5).

Further, described fixed electorde A(2), fixed electorde B(3), fixed electorde C(4), liquid moving electrode (5), electric capacity change-over circuit (7) and Single Chip Microcomputer (SCM) system (8) composition planar horizontal pick-up unit, fixed electorde A(2), fixed electorde B(3), fixed electorde C(4), liquid moving electrode (5) is connected respectively to electric capacity change-over circuit (7), electric capacity change-over circuit (7) connects Single Chip Microcomputer (SCM) system (8); Single Chip Microcomputer (SCM) system (8) can be processed the electric capacity variable signal of electric capacity change-over circuit (7).

Described fixed electorde A(2), fixed electorde B(3), fixed electorde C(4), liquid moving electrode (5), electric capacity change-over circuit (7) and Single Chip Microcomputer (SCM) system (8) composition planar horizontal pick-up unit, fixed electorde A(2), fixed electorde B(3), fixed electorde C(4), liquid moving electrode (5) is connected respectively to electric capacity change-over circuit (7), electric capacity change-over circuit (7) connects Single Chip Microcomputer (SCM) system (8).

Further, described electric capacity change-over circuit (7) is two electric capacity digital conversion chips, directly converts the capacity of three variable condenser to electric capacity digital value.

Further, two electric capacity digital conversion chips of described electric capacity change-over circuit (7) are AD1750; Directly convert the capacity of three variable condenser to electric capacity digital value.

Further, described Single Chip Microcomputer (SCM) system (8) comprises single-chip microcomputer STC12LE4052, button and demonstration.

Further, described plastics sphere (1) even thickness, in the time that base is placed on horizontal plane, the capacity of three electric capacity is equal, and in the time that base tilts, three capacitances change, the face position that electric capacity increases is low, and the face position that electric capacity reduces is high, thus Judge plane level.For detection of whether level and measurement plane inclination angle of plane.

The invention has the beneficial effects as follows the ingenious spherical structure design of having utilized, there is volume little, lightweight, highly sensitive, measurement and easy for installation, measurement data can manifest in digitizing.

Accompanying drawing explanation

Fig. 1 is structural representation, and Fig. 2 is vertical view, and Fig. 3 is front view, and Fig. 4 is schematic block circuit diagram.In Fig. 1～Fig. 4,1 is that plastics sphere, 2 is that fixed electorde A, 3 is that fixed electorde B, 4 is that fixed electorde C, 5 is that liquid moving electrode, 6 bases, 7 are that treatment circuit, 8 is Single Chip Microcomputer (SCM) system.

Embodiment

With reference to accompanying drawing 1-4, more detailed description enforcement of the present invention;

1 one kinds of sphere condenser type planar horizontal detecting sensors of embodiment, by plastics sphere (1), fixed electorde A(2), fixed electorde B(3), fixed electorde C(4), liquid moving electrode (5), base (6), electric capacity change-over circuit (7) and Single Chip Microcomputer (SCM) system (8) form; Plastics sphere (1) becomes hollow ball shape, sphere wall thickness is even, inner sealing the conduction liquid that half capacity is housed form liquid moving electrode (5), plastics sphere (1) outside surface is from being longitudinally divided into trisection sphere, every 1/3rd spheres plate metal film and form three fixed electordes and be respectively fixed electorde A(2), fixed electorde B(3), fixed electorde C(4), mutually insulated between three fixed electordes, form three variable capacitances with liquid moving electrode (5); Three variable condenser are connected to electric capacity change-over circuit (7), and treatment circuit is connected to Single Chip Microcomputer (SCM) system (8).Base (6) is for supporting whole sphere electric capacity, and in the time that base is placed on horizontal plane, the capacity of three capacitors equates, in the time that base tilts, three condenser capacities change, and the low face electric capacity in position increases, the high face electric capacity in position reduces, thus Judge plane level.

In embodiment 2 the present embodiment, electric capacity change-over circuit (7) is two chip capacitor digital conversion chip AD7150, directly converts the capacity of three capacitors to digital value, by Single Chip Microcomputer (SCM) system (8) reading result, and in single-chip microcomputer, calculates capacitance.Single-chip microcomputer calculates base (6) place flat inclination by the large I of three capacitances.

In embodiment 3 the present embodiment, Single Chip Microcomputer (SCM) system (8) comprises single-chip microcomputer, reset circuit of SCM, crystal oscillator, button and display, and single-chip microcomputer adopts STC12LE4052, employing+3.3V Power supply.

In embodiment 4 the present embodiment, the overall diameter of plastics sphere (1) is 28mm, and it is 0.5mm that baton round is faced the wall and meditated thick, and in ball, conduction liquid adopts mercury.

A kind of sphere condenser type planar horizontal detecting sensor in embodiment 5 above-described embodiments can be embedded in the middle of surveying instrument, replaces base (6) by fixing pedestal.

Claims

1. A spherical capacitive plane level detection sensor, which is characterized by a plastic spherical surface (1), a fixed electrode A (2), a fixed electrode B (3), a fixed electrode C (4), and a liquid dynamic electrode (5) The plastic spherical surface (1) is hollow spherical, sealed inside and filled with half-capacity conductive liquid to form a liquid dynamic electrode (5), and the outer surface of the plastic spherical surface (1) is divided into three equal spherical surfaces from the longitudinal direction, and each equal spherical surface is plated with The metal film constitutes the fixed electrode A (2), the fixed electrode B (3), and the fixed electrode C (4). The three fixed electrodes are insulated from each other, and form three variable capacitors with the liquid dynamic electrode (5).

2. The spherical capacitive plane level detection sensor according to claim 1, characterized in that the fixed electrode A (2), the fixed electrode B (3), the fixed electrode C (4), and the liquid dynamic electrode (5) , capacitance conversion circuit (7) and single-chip microcomputer system (8) to form a plane level detection device, fixed electrode A (2), fixed electrode B (3), fixed electrode C (4), and liquid dynamic electrode (5) are respectively connected to the capacitor The conversion circuit (7), the capacitance conversion circuit (7) is connected to the single-chip microcomputer system (8); the single-chip microcomputer system (8) can process the capacitance variable signal of the capacitance conversion circuit (7).

3. The spherical capacitive plane level detection sensor according to claim 1, characterized in that the thickness of the plastic spherical surface (1) is uniform, when the base is placed on a horizontal plane, the capacities of the three capacitors are equal, and when the base is inclined , the capacity of the three capacitors changes, the position of the surface with increased capacitance is low, and the position of the surface with decreased capacitance is high, so as to judge the level of the plane.

4. The spherical capacitive plane level detection sensor according to claim 2 is used for detecting whether the plane is level and measuring the inclination angle of the plane.

5. The spherical capacitive plane level detection sensor according to claim 2, characterized in that, the capacitance conversion circuit (7) is two capacitance-to-digital conversion chips, which directly convert the capacities of three variable capacitors into capacitance-digital value.

6. The spherical capacitive plane level detection sensor according to claim 5, characterized in that the two capacitance-to-digital conversion chips of the capacitance conversion circuit (7) are AD1750.

7. The spherical capacitive plane level detection sensor according to claim 2, characterized in that the single-chip microcomputer system (8) includes a single-chip microcomputer STC12LE4052, buttons and display.