CN104034311B - In pairs trisection ring-circle nesting pole plate is staggeredly placed formula inclination angle measurement method and device in opposite directions - Google Patents

Abstract

Paired third ring-circle nested polar plates facing staggered placement type inclination measurement method and device belong to angle measurement technology, wherein the ring-shaped coplanar capacitive measuring head of the sensor unit is composed of a circular metal plate and three third circles Composed of annular metal plates, four metal plates are coplanar and concentric, and three thirds of circular metal plates are evenly distributed along the circumference, each of which forms a capacitor with the circular metal plate, and the two above-mentioned annular coplanar capacitances are measured The heads are respectively placed on two circular insulating substrates, 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 eight metal plates and connect them to the input end of the capacitance measurement unit, and the capacitance measurement unit is connected to the inclination calculation unit; when the container tilts, the relative position of the two annular coplanar capacitance probes and the insulating liquid will change Change, by measuring the change of the capacitance value, the inclination value can be obtained.

Description

Paired three-section ring-circle nested plates facing staggered inclination measurement method and device

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 trisected ring-circle nested polar plates opposite to each other, the insulating liquid used in the invention avoids electrochemical reactions such as the precipitation of the polar 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 a pair of three-segmented 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 divided into three equal parts along the radial direction to obtain three parts and one third of the circular metal plate. Each one-third circular metal plate forms a capacitor with the circular metal plate respectively, and the one-third circular metal plate is combined with the three-third circular metal plate to obtain 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 one-third of the 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 formed by each third of the ring-shaped metal plates and the circular metal plate is determined by the air The dielectric 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 above-mentioned one-third circular 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 kind of inclination measurement device of paired third ring-circle nested polar plates oppositely staggered, comprising a capacitance measurement 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, B; the ring-shaped coplanar capacitance probe A is composed of a circular metal plate a and three third circular metal plates b, c, d, of which three A one-third circular metal plate b, c, d is arranged on the outside of a circular metal plate a, and three one-third circular metal plates b, c, d are shared with one circular metal plate a The surfaces are concentric, and three one-third metal plates b, c, d are evenly distributed along the circumference; the annular coplanar capacitance probe B consists of a circular metal plate e and three one-third circular metal plates f, g, h, wherein three one-third circular metal plates f, g, h are arranged outside a circular metal plate e, and three one-third circular metal plates f, g, h is coplanar and concentric with a circular metal plate e, and three thirds of circular metal plates f, g, h are evenly distributed along the circumference; the three thirds of the annular coplanar capacitance probe A The circular metal plates b, c, d and the three-third circular metal plates f, g, h of the circular coplanar capacitive measuring head B are alternately distributed; the eight potential lead wires respectively connect the circular metal plates a , three one-third circular metal plates b, c, d and circular metal plate e, three one-third circular metal plates f, g, h are connected to the input end of the capacitance measuring unit; The cylindrical container is placed horizontally, and the insulating liquid accounting for 1/2 of the volume of the cylindrical container is sealed and injected into the cylindrical container.

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 one-third of the circular 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 three-section ring-circle 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 capacitive probe A in the sensor unit of the paired third ring-circle nested pole plate facing staggered placement type 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 third ring-circle nested polar plates facing each other and interlacing the inclination measuring device

Fig. 4 is a front view of the ring-shaped coplanar capacitive probe A in the sensor unit of the paired three-section ring-circle nested polar plates facing each other and interlacing the inclination measuring device

Figure 5 is a front view of the ring-shaped coplanar capacitive probe B in the sensor unit of the paired third 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 three-section ring-circle nested pole plate is tilted towards the sensor unit of the staggered inclination measuring device

Fig. 7 is an explanatory diagram when the ring-shaped coplanar capacitive probe B in the sensor unit of the paired three-section ring-circle nested pole plate is tilted towards the sensor unit of the staggered inclination measuring device

Figure 8 is a schematic diagram of the overall structure of the paired third-half ring-circular nested polar plates facing each other and interlacing the inclination measuring device

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

detailed description

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

A kind of inclination measurement device with pairs of three equal rings-circular nested pole plates opposite to each other, including a sensor unit 23, a capacitance measurement unit 24 and an inclination calculation unit 25, as shown in Figure 8 is a schematic diagram of the overall structure of the inclination measurement device .

Shown in Fig. 1 is the profile perspective view of the sensor unit of the inclinometer, the structure of the sensor unit 23 is: the two open ends of the open cylindrical container 13 are hermetically assembled with two circular insulating substrates 6 respectively , 12, two ring-shaped coplanar capacitance probes A1, B7 are respectively equipped on the sides of two circular insulating substrates 6 and 12 in the cavity of the cylindrical container 13; the ring-shaped coplanar capacitance probe A1 is composed of a circle Shaped metal plate a2 and three 1/3 circular metal plates b3, c4, d5, wherein three 1/3 circular metal plates b3, c4, d5 are arranged on the outside of a circular metal plate a2, And three one-third circular metal plates b3, c4, d5 are coplanar and concentric with one circular metal plate a2, and three one-third metal plates b3, c4, d5 are evenly distributed along the circumferential direction; The coplanar capacitive probe B7 is composed of a circular metal plate e8 and three one-third circular metal plates f9, g10, h11, among which three one-third circular metal plates f9, g10, h11 are configured On the outside of a circular metal plate e8, and three 1/3 circular metal plates f9, g10, h11 are coplanar and concentric with a circular metal plate e8, three 1/3 circular metal plates f9, g10, h11 are evenly distributed along the circumferential direction; the three thirds of the annular metal plates b3, c4, d5 of the annular coplanar capacitance probe A1 and the three thirds of the annular coplanar capacitance probe B7 Circular metal plates f9, g10, h11 are staggered; eight potential lead wires 15, 16, 17, 18, 19, 20, 21, 22 respectively connect the circular metal plate a2, three thirds of the circular Metal plates b3, c4, d5, circular metal plate e8, three thirds of circular metal plates f9, g10, h11 are connected to the input end of the capacitance measurement unit 24; the cylindrical container 13 is placed horizontally, The insulating liquid 14 accounting for half of the volume of the cylindrical container 13 is sealed and injected into the cylindrical container 13 .

The circular insulating substrates 6, 12 are made of resin glass fiber material.

The insulating liquid 14 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 a pair of three-segmented 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 circular metal plate are coplanarly and concentrically placed, and the outer circular metal plate is radially divided into three equal parts to obtain three and one-third circular metal plates. Each third of the circular metal plate forms a capacitor with the circular metal plate, and the one circular metal plate is combined with three thirds of the circular metal plate to obtain 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 one-third of the rings 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 ring-shaped coplanar capacitance probes, and the capacitance value formed by each third of the ring-shaped 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 It can be represented by the following formula respectively.

Fig. 5 is the front view of the annular coplanar capacitance probe B in the sensor unit of the inclinometer, the capacitance formed by the metal plates 8, 9 and the capacitance formed by the metal plates 8, 10 and the capacitance formed by the metal plates 8, 11 It can be represented by the following formula 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, and the capacitance formed by metal plates 2 and 5 are respectively:

The difference and summation of the above formula can be obtained:

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 8, 9, the capacitance formed by the metal plates 8, 10 and the capacitance formed by the metal plates 8, 11 are respectively:

The difference and summation of the above formula can be obtained:

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 -90°, 30° and 150°, 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 capacitance measurement unit The input can improve the sensitivity of the inclination measuring device and make the measurement result more accurate. Similarly, when the inclination angle is around -150°, -30° and 90°, the liquid surface of the insulating liquid is close to the radial dividing line of the annular coplanar capacitance probe A, at this time, the annular coplanar capacitance probe B As the input of the capacitance measurement unit, the same effect can also be achieved.

Claims (4)

1. A method for measuring the angle of inclination of a pair of third rings-circle nested pole plates facing each other in a staggered manner, characterized in that: 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 divided into three equal parts along the radial direction to obtain three parts and one-third of the circular metal plate, each One third of the circular metal plate forms a capacitor with the circular metal plate respectively, and the one circular metal plate is combined with three thirds of the circular metal plate to obtain 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 one-third of the 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 formed by each third of the ring-shaped metal plates and the circular metal plate is determined by the air The dielectric 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 above-mentioned one-third circular 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. 2. A pair of three equal rings-circle nested pole plates are oppositely staggered and placed inclination measuring device, comprising a capacitance measurement unit (24) and an inclination calculation unit (25), and the capacitance measurement unit (24) and the inclination calculation The unit (25) is connected; it is characterized in that: the device also includes a sensor unit (23), and the structure of the sensor unit (23) is: the two open ends of the cylindrical container (13) that are open at both ends are respectively Two circular insulating substrates (6, 12) are hermetically assembled, and two ring-shaped coplanar capacitive probes A are respectively installed on the inner sides of the two circular insulating substrates (6, 12) in the cavity of the cylindrical container (13) . 4, 5) constitute, wherein three one-third circular metal plates b, c, d (3, 4, 5) are arranged on the outer side of one circular metal plate a (2), and three one-third Circular metal plates b, c, d (3, 4, 5) are coplanar and concentric with a circular metal plate a (2), and three third metal plates b, c, d (3, 4, 5 ) is uniformly distributed along the circumference; the annular coplanar capacitive measuring head B (7) consists of a circular metal plate e (8) and three thirds of circular metal plates f, g, h (9, 10 , 11) constitute, wherein three one-third circular metal plates f, g, h (9, 10, 11) are arranged on the outer side of one circular metal plate e (8), and three one-third circles Annular metal plates f, g, h (9, 10, 11) are coplanar and concentric with a circular metal plate e (8), and three thirds of circular metal plates f, g, h (9, 10 , 11) uniformly distributed along the circumferential direction; three thirds of the annular metal plates b, c, d (3, 4, 5) of the annular coplanar capacitance probe A (1) and the annular coplanar capacitance The three-third circular metal plates f, g, h (9, 10, 11) of the probe B (7) are distributed alternately; eight potential leads (15, 16, 17, 18, 19, 20, 21, 22) the circular metal plate a (2), three third circular metal plates b, c, d (3, 4, 5) and the circular metal plate e (8), three One third circular metal plate f, g, h (9,10,11) is connected with the input end of capacitance measurement unit (24); Described cylinder container (13) is horizontally placed, in described cylinder In the body container (13), the insulating liquid (14) that accounts for 1/2 of the volume of the cylinder container (13) is injected. 3. The paired trisecting ring-circle nested pole plate facing staggered inclination measuring device according to claim 2, characterized in that: the circular insulating substrate (6, 12) is made of resin glass fiber material production. 4. The paired three-section ring-circle nested polar plate facing staggered inclination measuring device according to claim 2, characterized in that: the insulating liquid (14) is made of methanol, ethanol, isopropyl Alcohol alcohols, acetone, butanone ketones, diethylene glycol monobutyl ether ethers in combination of one or more liquid.