CN104019798B - The nested pole plate inclination angle measurement method of concentric coplanar trisection ring-circle and device - Google Patents

Abstract

The method and device for measuring the inclination angle of concentric and coplanar three-part ring-circle nested polar plates belong to the angle measurement technology, wherein the ring-shaped coplanar capacitive measuring head of the sensor unit is composed of a circular metal plate and three thirds of the ring-shaped metal Composed of four metal plates with the same plane and concentricity, three one-third circular metal plates are evenly distributed along the circumference, each of which forms a capacitor with the circular metal plate, and the ring-shaped coplanar capacitance probe is placed on the circular On the insulating substrate, the circular insulating substrate is used as the bottom surface of the cylindrical container, and the cylindrical container is placed horizontally, and 1/2 of the volume of insulating liquid is sealed and injected into the container, and the potential leads take out the potential of the four metal plates and connect them with the capacitor. The input terminal of the measurement unit is connected, and the capacitance measurement unit is connected with the inclination calculation unit; when the container is tilted, the relative position of the ring-shaped coplanar capacitance probe and the insulating liquid changes, and the inclination value can be obtained by measuring the change of the capacitance value .

Description

Method and device for measuring inclination angle of concentric and coplanar trisection ring-circle nested plates

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 limited range of the measurable inclination angle in the above-mentioned existing sensing method for detecting the inclination angle. The present invention proposes and designs a concentric The method and device for measuring the inclination angle of the coplanar trisection ring-circle nested polar plate. The insulating liquid used in the invention avoids electrochemical reactions such as the precipitation of the polar plate. 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 concentric and coplanar trisecting ring-circle nested polar plates, 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 ring-shaped coplanar capacitance probe vertically into the insulating liquid. The liquid level of the insulating liquid passes through the center of the ring-shaped coplanar capacitance probe. The capacitance value formed by the metal plate is determined by the dielectric constant of the air, the dielectric constant of the insulating liquid, the fan angle of each plate exposed to the air and the fan angle of the part immersed in the insulating liquid ;

(3) When the above-mentioned ring-shaped coplanar capacitance probe rotates along the center, its inclination angle changes, the liquid level of the insulating liquid remains horizontal, and the relative position of the ring-shaped coplanar capacitance probe and the insulating liquid changes. The sector angle of the plate exposed to the air and the sector angle of the part immersed in the insulating liquid are changed, and the change of the capacitance value formed by the above-mentioned one-third circular metal plate and the circular metal plate is measured , to obtain the inclination value.

A concentric and coplanar trisection ring-circle nested polar plate inclination measuring device, comprising a capacitance measurement unit and an inclination calculation unit, the capacitance measurement unit is connected to the inclination calculation unit; the device also includes a sensor unit, the sensor The structure of the unit is: a circular insulating substrate is sealed at the open end of a cylindrical container with an open end, and a ring-shaped coplanar capacitance probe is installed on the inner side of the circular insulating substrate in the cavity of the cylinder container; The coplanar capacitive probe is composed of a circular metal plate and three three-third circular metal plates, among which three three-third circular metal plates are arranged on the outside of a circular metal plate, and three three-third A one-third circular metal plate is coplanar and concentric with a circular metal plate, and three one-third circular metal plates are evenly distributed along the circumference; four potential lead wires respectively connect the circular metal plate, three three One-half of the circular metal plate is connected to the input end of the capacitance measuring unit; the cylindrical container is placed horizontally, and an insulating liquid accounting for half 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.

Description of drawings

Figure 1 is a perspective view of the sensor unit of the concentric and coplanar trisection ring-circle nested plate inclination measuring device

Figure 2 is a schematic diagram of the principle of the ring-shaped coplanar capacitance measuring head in the sensor unit of the concentric and coplanar trisection ring-circle nested plate inclination measuring device

Fig. 3 is the front view of the ring-shaped coplanar capacitive measuring head in the sensor unit of the concentric and coplanar trisection ring-circle nested plate inclination measuring device

Figure 4 is an explanatory diagram of the inclination of the ring-shaped coplanar capacitance measuring head in the sensor unit of the concentric and coplanar trisection ring-circle nested plate inclination measuring device

Figure 5 is a schematic diagram of the overall structure of the concentric coplanar trisection ring-circle nested plate inclination measuring device

Part number description in the figure: 1 ring-shaped coplanar capacitance measuring head, 2 circular metal plates, 3, 4, 5 one-third ring-shaped metal plates, 6 circular insulating substrate, 7 cylindrical container, 8 insulating liquid , 9, 10, 11, 12 potential leads, 13 sensor units, 14 capacitance measurement units, 15 inclination calculation units.

detailed description

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

A concentric coplanar trisecting ring-circle nested pole plate inclination measuring device, including a sensor unit 13, a capacitance measuring unit 14 and an inclination calculation unit 15, as shown in Figure 5 is a schematic diagram of the overall structure of the inclination measuring device.

Shown in Fig. 1 the profile perspective view of the sensor unit of inclination measuring device, the structure of described sensor unit 13 is: the open end that is the open end of the cylindrical container 7 of open shape 6 is assembled circular insulating substrate 6, in cylindrical container The 7-cavity is equipped with a ring-shaped coplanar capacitance probe 1 on the inner side of the circular insulating substrate 6; the ring-shaped coplanar capacitance probe 1 consists of a circular metal plate 2 and three one-third circular metal plates 3, 4, 5, wherein three one-third circular metal plates 3, 4, 5 are arranged on the outside of one circular metal plate 2, and three one-third circular metal plates 3, 4, 5 is coplanar and concentric with a circular metal plate 2, and three third circular metal plates 3, 4, 5 are evenly distributed along the circumferential direction; four potential lead wires 9, 10, 11, 12 respectively connect the circular The metal plate 2, three third circular metal plates 3, 4, 5 are connected to the input end of the capacitance measuring unit 14; the cylindrical container 7 is placed horizontally, and is sealed and injected into the cylindrical container 7 An insulating liquid 8 that accounts for 1/2 of the volume of the cylindrical container 7 .

The circular insulating substrate 6 is made of resin glass fiber material.

The insulating liquid 8 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 angle of concentric and coplanar trisecting ring-circle nested polar plates, 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 drawing 2, the power lines between the metal plates of the annular coplanar capacitance measuring head 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 ring-shaped coplanar capacitance probe vertically into the insulating liquid. The liquid level of the insulating liquid passes through the center of the ring-shaped coplanar capacitance probe. Each third of the circular metal plate and the circular metal The capacitance value formed by the plates is determined by the dielectric constant of the air, 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.

Fig. 3 is the front view of the ring-shaped coplanar capacitance probe in the sensor unit of the inclinometer, the capacitance formed by the metal plates 2, 3 and the capacitance formed by the metal plates 2, 4 and the formed capacitance by the metal plates 2, 5 can be Respectively expressed by the following formulae.

(3) When the above-mentioned ring-shaped coplanar capacitance measuring head rotates along the center, its inclination changes, the liquid level of the insulating liquid remains horizontal, and the relative position of the ring-shaped coplanar capacitance measuring head and the insulating liquid changes, and each plate The fan angles of the parts exposed to the air and the parts submerged in the insulating liquid change.

Fig. 4 shows an explanatory diagram when the ring-shaped coplanar capacitance probe 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:

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.

Claims (4)

1. A concentric coplanar trisection ring-circle nested polar plate inclination measurement method, characterized in that: the method steps 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 ring-shaped coplanar capacitance probe vertically into the insulating liquid. The liquid level of the insulating liquid passes through the center of the ring-shaped coplanar capacitance probe. The capacitance value formed by the metal plate is determined by the dielectric constant of the air, the dielectric constant of the insulating liquid, the fan angle of each plate exposed to the air and the fan angle of the part immersed in the insulating liquid ; (3) When the above-mentioned ring-shaped coplanar capacitance probe rotates along the center, its inclination angle changes, the liquid level of the insulating liquid remains horizontal, and the relative position of the ring-shaped coplanar capacitance probe and the insulating liquid changes. The sector angle of the plate exposed to the air and the sector angle of the part immersed in the insulating liquid are changed, and the change of the capacitance value formed by the above-mentioned one-third circular metal plate and the circular metal plate is measured , to obtain the inclination value. 2. a concentric coplanar trisection ring-circle nested pole plate inclination measuring device, comprising capacitance measuring unit (14) and inclination calculation unit (15), described capacitance measurement unit (14) and inclination calculation unit (15) ) connection; it is characterized in that: the device also includes a sensor unit (13), and the structure of the sensor unit (13) is: an open end of an open cylindrical container (7) is hermetically assembled with a circular insulating substrate (6), in the cylinder container (7) cavity, on the inner side of the circular insulating substrate (6), the ring-shaped coplanar capacitance measuring head (1) is equipped; the ring-shaped coplanar capacitance measuring head (1) consists of a circle shaped metal plate (2) and three 1/3 circular metal plates (3, 4, 5), wherein three 1/3 circular metal plates (3, 4, 5) are arranged in a circle Shaped metal plate (2) outside, and three 1/3 circular metal plates (3,4,5) and a circular metal plate (2) coplanar concentric, three 1/3 circular metal plates The plates (3, 4, 5) are evenly distributed along the circumferential direction; the four potential lead wires (9, 10, 11, 12) successively connect the circular metal plate (2), three third circular metal plates ( 3, 4, 5) are connected to the input end of the capacitance measuring unit (14); the cylindrical container (7) is placed horizontally, and the sealed injection in the cylindrical container (7) accounts for the volume of the cylindrical container (7). One-half of insulating liquid (8). 3. The device for measuring the inclination angle of concentric and coplanar trisection ring-circle nested polar plates according to claim 2, characterized in that: the circular insulating substrate (6) is made of resin glass fiber material. 4. The concentric coplanar trisection ring-circle nested polar plate inclination measuring device according to claim 2, characterized in that: the insulating liquid (8) is made of methanol, ethanol, isopropanol alcohol A liquid composed of one or more components of ketones, acetone, methyl ethyl ketone, and ethers of diethylene glycol monobutyl ether.