CN104019797B - The nested pole plate of paired quartering ring-circle is staggeredly placed formula inclination angle measurement method and device in opposite directions - Google Patents

Abstract

Paired quartered ring-circle nested polar plates are facing and staggered to measure the inclination angle measurement method and device, which belongs to the angle measurement technology, in which the ring-shaped coplanar capacitive measuring head of the sensor unit is composed of a circular metal plate and four quarter circles Composed of ring-shaped metal plates, five metal plates are coplanar and concentric, and four quarter-circle ring-shaped metal plates are evenly distributed along the circumference, each of which forms a capacitor with the circular metal plate. The heads are placed on two circular insulating substrates respectively, and the two circular insulating substrates are used as the two bottom surfaces of the cylindrical container, and the cylindrical container is placed horizontally, and 1/2 of the volume of the insulating liquid is sealed and injected into the container. The potential leads take out the potentials of the ten metal plates and connect them to the input end of the capacitance measurement unit, and the capacitance measurement unit is connected to the inclination angle calculation unit; Change, by measuring the change of the capacitance value, the inclination value can be obtained.

Description

Method and device for measuring inclination of paired quartered rings and circular nested polar plates facing each other and interlacing them

technical field

The invention belongs to the technical field of angle measurement, and mainly relates to an inclination angle measurement method and device.

Background technique

At present, the known sensing method for measuring the inclination angle utilizes the principle that the surface of the liquid is always kept horizontal in a static state. The container with liquid inside tilts, and after stabilization, the liquid level remains horizontal, but the relative position of the liquid to the container changes. By detecting the electrical quantity change caused by this process, the angle of the container relative to the liquid surface inside is calculated, and then the inclination angle of the container is determined.

For the sensing method of detecting the inclination angle between the container and the liquid surface added inside, it can be divided into two categories: resistive type and electrostatic capacitive type.

Introduced in Japanese Patent No. 2001-13160 related technology of resistive sensor, it is to seal a proper amount of conductive liquid in a cylindrical metal container with one end closed, and the opening is blocked with a metal disc. A pair of metal electrodes are penetrated and fixed on the circular plate. When the container is tilted, the angle between the container and the liquid surface inside changes, so that the contact area between the metal electrode and the conductive liquid changes, and the resistance between the metal container and each metal electrode changes. By measuring the change in its resistance value, the inclination angle of the container can be detected.

However, the direct contact between the metal electrode and the conductive liquid will cause electrochemical reactions such as the precipitation of the metal of the electrode itself and the electrolysis of the conductive liquid. It is difficult to guarantee the accuracy and stability of the sensor for a long time.

As for the electrostatic capacitive sensor, related technologies are introduced in Chinese Patent No. CN1668892A. The sensor is to seal 1/2 of the inner volume of the conductive liquid in the cylindrical airtight container of the electrical insulation system. The plate-shaped main electrode is placed on the two parallel sides of the container, and the surface has a silicon oxide coating film, which acts as Dielectric. When the container is tilted, the angle between the container and the liquid surface inside changes, and the capacitance between the plate-shaped main electrode and the conductive liquid changes. Therefore, the change of its capacitance value is measured to detect the size of the inclination angle of the container.

However, in the case of this electrostatic capacitive sensor, when the inclination angle of the cylindrical airtight container is too large, the liquid inside the container is biased to one side and loses contact with the other main electrode. effect. Due to the limitations of the principle, the measuring range of the inclination angle is always limited and depends on the internal structure size of the container.

Contents of the invention

The present invention aims at problems such as the direct contact between the metal electrode and the conductive liquid, the long-term guarantee of the stability of the sensor, and the limitation of the measurable range of the inclination angle in the above-mentioned existing sensing methods for detecting the inclination angle. The present invention proposes and designs a complete For the method and device for measuring the angle of inclination of the quartered ring-circle nested pole plates facing each other, the insulating liquid used in this invention avoids electrochemical reactions such as the precipitation of the pole plates, and the ring-shaped coplanar capacitance structure in the sensor unit realizes 360-degree full-scale measurement.

The object of the present invention is achieved through the following technical solutions:

A method for measuring the inclination of pairs of quartered ring-circle nested polar plates facing each other and interlaced, the steps of the method are as follows:

(1), a circular metal plate and the outer circular metal plate are placed concentrically on the same plane, and the outer circular metal plate is quartered in the radial direction to obtain a quarter of a circular metal plate. Each quarter of the circular metal plate forms a capacitor with the circular metal plate respectively, and the combination of the one circular metal plate and the quarter of the circular metal plate obtains a ring-shaped coplanar capacitance measuring head;

(2) Immerse the two ring-shaped coplanar capacitance probes vertically into the insulating liquid, place the two ring-shaped coplanar capacitance probes coaxially and face each other, and the quarter circle of the two ring-shaped coplanar capacitance probes The ring-shaped metal plates are distributed alternately, the liquid level of the insulating liquid passes through the center of the two ring-shaped coplanar capacitance probes, and the capacitance value formed by each quarter ring metal plate and the circular metal plate is determined by the medium of air. The electrical constant, the dielectric constant of the insulating liquid, the fan angles of the respective plates exposed to the air and the fan angles of the parts immersed in the insulating liquid are jointly determined;

(3) When the two ring-shaped coplanar capacitance probes rotate along the center, the inclination angle changes, the liquid level of the insulating liquid remains horizontal, and the relative position of the two ring-shaped coplanar capacitance probes and the insulating liquid changes. Change, the fan angle of each plate exposed to the air and the fan angle of the part immersed in the insulating liquid change, measure the capacitance formed by the quarter-circle ring metal plate and the circular metal plate The change of the capacitance value is obtained to obtain the value of the inclination angle;

(4), the above two annular coplanar capacitance probes rotate along the center, and when the insulating liquid liquid plane is close to the radial dividing line of any annular coplanar capacitance probe, take another annular coplanar capacitance probe. The calculation result of is used as the final inclination calculation result.

A pair of quartered rings-circular nested pole plates facing staggered inclination measuring device, comprising a capacitance measuring unit and an inclination calculation unit, the capacitance measurement unit is connected with the inclination calculation unit; the device also includes a sensor unit, The structure of the sensor unit is: the two open ends of the cylindrical container with openings at both ends are sealed and assembled with two circular insulating substrates respectively, and the inner sides of the two circular insulating substrates are respectively arranged in the cavity of the cylindrical container. Install two ring-shaped coplanar capacitance probes A and B; the ring-shaped coplanar capacitance probe A is composed of a circular metal plate a and four quarter-circular metal plates b, c, d, e, Wherein four 1/4 circular metal plates b, c, d, e are configured on the outside of a circular metal plate a, and four 1/4 circular metal plates b, c, d, e are connected with a The circular metal plate a is coplanar and concentric, and the four quarter metal plates b, c, d, e are evenly distributed along the circumference; the ring-shaped coplanar capacitance probe B consists of a circular metal plate f and four four 1/4 ring-shaped metal plates g, h, i, j, wherein four 1/4 ring-shaped metal plates g, h, i, j are arranged on the outside of a circular metal plate f, and four four One-quarter circular metal plates g, h, i, j are coplanar and concentric with one circular metal plate f, and four quarter circular metal plates g, h, i, j are evenly distributed along the circumferential direction; The four quarter circular metal plates b, c, d, e of the annular coplanar capacitance probe A and the four quarter circular metal plates g, h, i, j are staggeredly distributed; ten potential lead wires respectively divide the circular metal plate a, the four quarter circular metal plates b, c, d, e and the circular metal plate f, four quarters respectively One of the annular metal plates g, h, i, j is connected to the input end of the capacitance measuring unit; the cylindrical container is placed horizontally, and the sealed injection in the cylindrical container accounts for 1/2 of the volume of the cylindrical container insulating liquid.

The present invention has following characteristics and good effect:

(1) Compared with the resistive inclination measuring device, since the insulating liquid is in contact with the electrode plate, electrochemical reactions such as metal precipitation on the plate itself are avoided, so the stability and reliability of the sensor can be maintained for a long time.

(2) Compared with the electrostatic capacitive inclination measuring device, since the horizontal container can rotate 360 degrees along the central axis, the output capacitance value always has a functional relationship with the inclination angle, so the measurement range is not limited, and it has a full range of 360 degrees The characteristics of the measurement.

(3) Due to the use of two ring-shaped coplanar capacitance probes placed coaxially and oppositely, and the quarter-circle ring metal plates of the two ring-shaped coplanar capacitance probes are staggered, which improves the proximity of the insulating liquid surface. The sensitivity of inclination measurement when the radial dividing line of the annular coplanar capacitive probe is used, the measurement result is more accurate.

Description of drawings

Figure 1 is a perspective view of the appearance of the sensor unit of the paired quartered ring-circular nested polar plates facing each other and interlacing the inclination measuring device

Figure 2 is a schematic diagram of the principle of the ring-shaped coplanar capacitance probe A in the sensor unit of the paired quartered ring-circle nested polar plates facing each other and interlacing the inclination measuring device

Figure 3 is a schematic diagram of the principle of the ring-shaped coplanar capacitive probe B in the sensor unit of the paired quartered ring-circle nested polar plates facing each other and interlacing the inclination measuring device

Figure 4 is a front view of the ring-shaped coplanar capacitive probe A in the sensor unit of the paired quartered ring-circle nested polar plates facing each other and staggeredly placed inclinometers

Fig. 5 is a front view of the ring-shaped coplanar capacitive probe B in the sensor unit of the paired quartered ring-circle nested polar plates facing each other and interlacing the inclination measuring device

Fig. 6 is an explanatory diagram when the ring-shaped coplanar capacitive probe A in the sensor unit of the paired quartered ring-circle nested pole plate is tilted towards the sensor unit of the staggered inclination measuring device

Figure 7 is an explanatory diagram when the ring-shaped coplanar capacitive probe B in the sensor unit of the paired quartered ring-circle nested polar plates is tilted towards the sensor unit of the staggered inclination measuring device

Figure 8 is a schematic diagram of the overall structure of a pair of quartered rings-circular nested plates facing each other and staggered to measure the inclination angle

Part number description in the figure: 1 ring-shaped coplanar capacitive probe A, 2 circular metal plate a, 3 quarter circular metal plate b, 4 quarter circular metal plate c, 5 quarter 1 circular metal plate d, 6 quarter circular metal plate e, 7 circular insulating substrate, 8 circular coplanar capacitive probe B, 9 circular metal plate f, 10 quarter circular Metal plate g, 11 1/4 circular metal plate h, 12 1/4 circular metal plate i, 13 1/4 circular metal plate j, 14 circular insulating substrate, 15 cylindrical container , 16 insulating liquid, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 potential leads, 27 sensor unit, 28 capacitance measurement unit, 29 inclination calculation unit.

detailed description

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

A pair of quartered ring-circle nested polar plates are facing and staggered inclination measuring device, including a sensor unit 27, a capacitance measuring unit 28 and an inclination calculation unit 29, as shown in Figure 8 is a schematic diagram of the overall structure of the inclination measuring device .

Shown in Fig. 1 is the profile perspective view of the sensor unit of the inclinometer, the structure of the sensor unit 27 is: the two open ends of the cylindrical container 15 that are open at both ends are sealed and assembled with two circular insulating substrates 7 respectively , 14, two ring-shaped coplanar capacitance probes A1, B8 are respectively equipped on the sides of two circular insulating substrates 7 and 14 in the cavity of the cylinder container 15; the ring-shaped coplanar capacitance probe A1 is composed of a circle Shaped metal plate a2 and four quarter-circular metal plates b3, c4, d5, e6, among which four quarter-circular metal plates b3, c4, d5, e6 are arranged on a circular metal plate outside the plate a2, and the four quarter circular metal plates b3, c4, d5, e6 are coplanar and concentric with a circular metal plate a2, and the four quarter metal plates b3, c4, d5, e6 are along the Evenly distributed in the circumferential direction; the ring-shaped coplanar capacitance probe B8 is composed of a circular metal plate f9 and four quarter-circle ring-shaped metal plates g10, h11, i12, j13, of which four quarter-circle Annular metal plates g10, h11, i12, j13 are arranged outside a circular metal plate f9, and four quarter circular metal plates g10, h11, i12, j13 are coplanar and concentric with a circular metal plate f9 , the four quarter circular metal plates g10, h11, i12, j13 are evenly distributed along the circumference; the four quarter circular metal plates b3, c4, d5, e6 and the four quarter circular metal plates g10, h11, i12, j13 of the annular coplanar capacitance probe B8 are distributed alternately; ten potential leads 17, 18, 19, 20, 21, 22, 23 , 24, 25, and 26 successively place circular metal plate a2, four quarter-circular metal plates b3, c4, d5, e6 and circular metal plate f9, four quarter-circular metal plates Plates g10, h11, i12, j13 are connected to the input end of the capacitance measuring unit 28; the cylindrical container 15 is placed horizontally, and the insulating material accounting for 1/2 of the volume of the cylindrical container 15 is sealed and injected into the cylindrical container 15. Sexual fluid16.

The circular insulating substrates 7, 14 are made of resin glass fiber material.

The insulating liquid 16 is a liquid composed of one or more components of methanol, ethanol, alcohols of isopropanol, acetone, ketones of methyl ethyl ketone, and ethers of diethylene glycol monobutyl ether.

A method for measuring the inclination of pairs of quartered ring-circle nested polar plates facing each other and interlaced, the steps of the method are as follows:

(1) A circular metal plate and an outer annular metal plate are coplanarly placed concentrically, and the outer annular metal plate is quartered radially to obtain four quarters of an annular metal plate. Each quarter of the circular metal plate forms a capacitor with the circular metal plate, and the combination of the one circular metal plate and the quarter of the circular metal plate forms a ring-shaped coplanar capacitance measuring head.

Referring to accompanying drawings 2 and 3, the power lines between the metal plates of the ring-shaped coplanar capacitance probes A and B are evenly distributed along the metal plates, which can be approximately replaced by semicircular arc lines. According to the solution formula of a single coplanar capacitance, it can be known that the annular coplanar capacitance is proportional to the dielectric constant of the dielectric, which can be expressed by the following formula.

C＝K·ε

(2) Immerse the two ring-shaped coplanar capacitance probes vertically into the insulating liquid, place the two ring-shaped coplanar capacitance probes coaxially and face each other, and the quarter ring of the two ring-shaped coplanar capacitance probes Shaped metal plates are distributed alternately, the liquid level of the insulating liquid passes through the center of two annular coplanar capacitance probes, and the capacitance value formed by each quarter-circular metal plate and the circular metal plate is determined by the medium of air The electrical constant, the dielectric constant of the insulating liquid, the fan angles of the parts exposed to the air and the fan angles of the parts immersed in the insulating liquid are jointly determined.

Fig. 4 is the front view of the annular coplanar capacitance probe A in the sensor unit of the inclinometer, the capacitance formed by the metal plates 2, 3, the capacitance formed by the metal plates 2, 4, and the capacitance formed by the metal plates 2, 5 And the capacitance formed by the metal plates 2 and 6 can be represented by the following equations, respectively.

Fig. 5 is the front view of the ring-shaped coplanar capacitance probe B in the sensor unit of the inclinometer, the capacitance formed by the metal plates 9,10, the capacitance formed by the metal plates 9,11, and the capacitance formed by the metal plates 9,12 And the capacitances formed by the metal plates 9 and 13 can be represented by the following equations, respectively.

(3) When the two ring-shaped coplanar capacitance probes rotate along the center, the inclination angle changes, the liquid level of the insulating liquid remains horizontal, and the relative position of the two ring-shaped coplanar capacitance probes and the insulating liquid changes. , the fan angles of the exposed parts of the plates in the air and the fan angles of the parts immersed in the insulating liquid change.

FIG. 6 shows an explanatory diagram when the ring-shaped coplanar capacitance probe A is tilted. At this time, the capacitance formed by metal plates 2 and 3, the capacitance formed by metal plates 2 and 4, the capacitance formed by metal plates 2 and 5, and the capacitance formed by metal plates 2 and 6 are respectively:

Combining the difference of the above formula can get:

Then the solution formula to obtain the inclination angle is:

FIG. 7 shows an explanatory diagram when the ring-shaped coplanar capacitance probe B is tilted. At this time, the capacitance formed by the metal plates 9 and 10, the capacitance formed by the metal plates 9 and 11, the capacitance formed by the metal plates 9 and 12, and the capacitance formed by the metal plates 9 and 13 are respectively:

Combining the difference of the above formula can get:

Then the solution formula to obtain the inclination angle is:

The obtained signals are compared and processed by the capacitance measurement unit and the inclination calculation unit to obtain an output of the inclination angle.

(4) The above-mentioned two annular coplanar capacitance probes rotate in a circle along the center, and when the liquid surface of the insulating liquid is close to the radial dividing line of any annular coplanar capacitance probe, take another annular coplanar capacitance probe obtained The calculation result is used as the final inclination calculation result.

When the inclination angle is around ±45° and ±135°, the liquid surface of the insulating liquid is close to the radial dividing line of the annular coplanar capacitance probe B. At this time, the annular coplanar capacitance probe A is used as the input of the capacitance measurement unit , can improve the sensitivity of the inclination measuring device and make the measurement result more accurate. Similarly, when the inclination angle is around 0° and ±90°, the liquid surface of the insulating liquid is close to the radial dividing line of the annular coplanar capacitance probe A, and the annular coplanar capacitance probe B is used as the capacitance measurement unit at this time The input can also achieve the same effect.

Claims (4)

1. the nested pole plate of a paired quartering ring-circle is staggeredly placed formula inclination angle measurement method in opposite directions, it is characterised in that: described method step is as follows:

(1), by coplanar to a circular metal plate and outer circle annular metal sheet concentric placement, and the outer circle annular metal sheet radially quartering, obtain four parts of quadrant annular metal sheets, described every a quadrant annular metal sheet forms electric capacity, one circular metal plate and four parts of quadrant annular metal sheet combinations respectively and obtains annular coplanar capacitance gauge head with circular metal plate；

(2), two above-mentioned annular coplanar capacitance gauge heads are dipped vertically in insulating liquid, two annular coplanar capacitance gauge heads are coaxial to be placed in opposite directions, and the quadrant annular metal sheet of two annular coplanar capacitance gauge heads is interspersed, the liquid level of the insulating liquid center by two annular coplanar capacitance gauge heads, the capacitor's capacity that every a quadrant ring metallic plate and circular metal plate are formed is by the dielectric constant of air, the dielectric constant of insulating liquid, the exposed part in atmosphere of respective pole plate to segment angle and be immersed in insulating liquid part to segment angle together decide on；

(3) when, above-mentioned two annular coplanar capacitance gauge head carries out circumference rotation along center, its inclination angle changes, the liquid level of insulating liquid keeps level, the relative position of two annular coplanar capacitance gauge heads and insulating liquid changes, the exposed part in atmosphere of each pole plate to segment angle and be immersed in insulating liquid part to segment angle change, measure the capacitor's capacity that above-mentioned quadrant annular metal sheet is formed with circular metal plate, try to achieve inclination value；

(4), above-mentioned two annular coplanar capacitance gauge head carries out circumference rotation along center, when insulating liquid liquid level closes on the radial direction cut-off rule of arbitrary annular coplanar capacitance gauge head, take the result of calculation of another annular coplanar capacitance gauge head gained as final Dip countion result.

2. the nested pole plate of a paired quartering ring-circle is staggeredly placed formula dip measuring device in opposite directions, including capacitance measurement unit (28) and Dip countion unit (29), described capacitance measurement unit (28) is connected with Dip countion unit (29)；It is characterized in that: described device also includes sensor unit (27), the structure of described sensor unit (27) is: two openings of the cylindrical container (15) opening-like at two ends seal two round insulation substrates (7,14) of assembling respectively, is positioned on the inboard face of two round insulation substrates (7,14) at cylindrical container (15) intracavity and is equipped with two annular coplanar capacitance gauge head A, B (1,8) respectively；Described annular coplanar capacitance gauge head A (1) is made up of a circular metal plate a (2) and four quadrant annular metal sheet b, c, d, e (3,4,5,6), wherein four quadrant annular metal sheet b, c, d, e (3,4,5,6) are arranged in circular metal plate a (2) outside, and four quadrant annular metal sheet b, c, d, e (3,4,5,6) are coplanar concentric with a circular metal plate a (2), four four points

One of metallic plate b, c, d, e (3,4,5,6) be uniformly distributed circumferentially；Described annular coplanar capacitance gauge head B (8) is by a circular metal plate f (9) and four quadrant annular metal sheet g, h, i, j (10, 11, 12, 13) constitute, wherein four quadrant annular metal sheet g, h, i, j (10, 11, 12, 13) circular metal plate f (9) outside it is arranged in, and four quadrant annular metal sheet g, h, i, j (10, 11, 12, 13) coplanar concentric with a circular metal plate f (9), four quadrant annular metal sheet g, h, i, j (10, 11, 12, 13) it is uniformly distributed circumferentially；Four quadrant annular metal sheet b, c, d, e (3,4,5,6) of described annular coplanar capacitance gauge head A (1) and four quadrant annular metal sheet g, h, i, j (10,11,12,13) of annular coplanar capacitance gauge head B (8) are interspersed；Circular metal plate a (2), four quadrant annular metal sheet b, c, d, e (3,4,5,6) and circular metal plate f (9), four quadrant annular metal sheet g, h, i, j (10,11,12,13) are connected by ten current potentials lead-in wire (17,18,19,20,21,22,23,24,25,26) successively respectively with the input of capacitance measurement unit (28)；Described cylindrical container (15), in horizontal, seal injection in described cylindrical container (15) and accounts for the insulating liquid (16) of cylindrical container (15) volume 1/2nd.

3. the nested pole plate of paired quartering ring according to claim 2-circle is staggeredly placed formula dip measuring device in opposite directions, it is characterised in that: described round insulation substrate (7,14) is made up of resin glass fiber material.

4. the nested pole plate of paired quartering ring according to claim 2-circle is staggeredly placed formula dip measuring device in opposite directions, it is characterised in that: described insulating liquid (16) be by methanol, ethanol, the alcohols of isopropanol, acetone, the ketone of butanone, diethylene glycol monobutyl ehter ethers in the liquid of one or more compositions combination.