CN104034308A - Concentric coplanar bisectional annular-bisectional circular nested pole plate inclination angle measuring method and apparatus thereof - Google Patents

Abstract

The concentric coplanar bisecting ring-bisecting circle nested polar plate inclination measurement method and device belong to the angle measurement technology, wherein the annular coplanar capacitance measuring head of the sensor unit is composed of two semicircular metal plates and two semicircular annular metal plates The four metal plates are coplanar and concentric, and the two semi-circular metal plates are evenly distributed along the circumference and correspond to the two semi-circular metal plates to form a capacitor. 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. 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 of concentric and coplanar bisecting ring-bisecting 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 Coplanar bisecting ring-bisecting circle nested pole plate inclination measurement method and device, the insulating liquid used in the invention avoids electrochemical reactions such as the precipitation of the pole plate, 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 concentric coplanar bisecting ring-bisecting circle nested polar plate inclination measuring method, the steps of the method are as follows:

(1), place a circular metal plate and the outer annular metal plate on the same plane and concentrically, and divide the circular metal plate and the outer annular metal plate into two halves along the radial direction to obtain two semicircular metal plates respectively and two semi-circular metal plates, the semi-circular metal plate and the semi-circular metal plate facing the same fan angle form a capacitor, and the two semi-circular metal plates are combined with two semi-circular metal plates to obtain a ring coplanar capacitive probe;

(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 semicircular metal plate and the semicircular metal plate facing the same fan angle The capacitance value formed by the plates is determined by the dielectric constant of air, the dielectric constant of the insulating liquid, the sector angles of the respective plates exposed to the air and the sector angles of the parts 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 capacitance value formed by the semicircular metal plate and the semicircular metal plate opposite to the same sector angle is measured change to obtain the inclination value.

A concentric coplanar bisecting ring-bisecting circle nested 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 structure of the sensor 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 capacitive probe is installed on the inner side of the circular insulating substrate in the cylindrical container cavity; The annular coplanar capacitive measuring head is composed of two semicircular metal plates and two semicircular annular metal plates, wherein the two semicircular annular metal plates are arranged outside the two semicircular metal plates, and the two semicircular annular metal plates Coplanar and concentric with two semicircular metal plates, the two semicircular annular metal plates are evenly distributed along the circumferential direction and correspond to the two semicircular metal plates one by one; four potential leads connect the two semicircular metal plates in turn The metal plate and the two semi-circular metal plates are 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.

(3) Since the circular metal plate and the outer annular metal plate are divided into two halves in the radial direction, the obtained two semicircular metal plates and the two semicircular annular metal plates correspond one-to-one, so that the annular coplanar capacitance probe The distribution of electric force lines near the radial division line is more uniform, which eliminates the small errors caused by radial division in principle, and the measurement results are more accurate.

Description of drawings

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

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

Fig. 3 is the front view of the ring-shaped coplanar capacitance probe in the sensor unit of the concentric coplanar bisecting ring-bisecting circle nested plate inclination measuring device

Fig. 4 is an explanatory diagram when the ring-shaped coplanar capacitance probe in the sensor unit of the concentric coplanar bisecting ring-bisecting circle nested plate inclination measuring device is tilted

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

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

Detailed ways

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

A concentric coplanar bisecting ring-bisecting 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 an annular coplanar capacitance probe 1 on the inner side of the circular insulating substrate 6; the annular coplanar capacitance probe 1 consists of two semicircular metal plates 2, 3 and two semicircular annular metal plates 4 . The two semi-circular metal plates 4, 5 are evenly distributed along the circumferential direction and correspond to the two semi-circular metal plates 2, 3; the four potential leads 9, 10, 11, 12 connect the two A semicircular metal plate 2, 3, two semicircular annular metal plates 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 fluid in the cylindrical container 7 The insulating liquid 8 of one-half volume of the cylinder 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 concentric coplanar bisecting ring-bisecting circle nested polar plate inclination measuring method, the method steps are as follows:

(1) A circular metal plate and an outer annular metal plate are placed concentrically on the same plane, and the circular metal plate and the outer annular metal plate are divided into two equal parts along the radial direction to obtain two semicircular metal plates and Two semi-circular metal plates, the semi-circular metal plate and the semi-circular metal plate opposite the same sector angle form a capacitor, and the two semi-circular metal plates are combined with two semi-circular metal plates to obtain a ring-shaped coplanar capacitor Probe.

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 annular coplanar capacitance probe vertically into the insulating liquid, the liquid level of the insulating liquid passes through the center of the annular coplanar capacitance probe, the semicircular metal plate and the semicircular annular metal plate opposite to the same sector angle The resulting capacitance value is determined by the dielectric constant of 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 a front view of the ring-shaped coplanar capacitance measuring head in the sensor unit of the inclination measuring device. The capacitance formed by the metal plates 2 and 4 and the capacitance formed by the metal plates 3 and 5 can be expressed by the following formulas respectively.

(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 4 and the capacitance formed by metal plates 3 and 5 are respectively:

The difference between the two formulas 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 bisecting ring-bisecting circle nested polar plate inclination measuring method, is characterized in that: the method steps are as follows: (1), place a circular metal plate and the outer annular metal plate on the same plane and concentrically, and divide the circular metal plate and the outer annular metal plate into two halves along the radial direction to obtain two semicircular metal plates respectively and two semi-circular metal plates, the semi-circular metal plate and the semi-circular metal plate facing the same fan angle form a capacitor, and the two semi-circular metal plates are combined with two semi-circular metal plates to obtain a ring coplanar capacitive probe; (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 semicircular metal plate and the semicircular metal plate facing the same fan angle The capacitance value formed by the plates is determined by the dielectric constant of air, the dielectric constant of the insulating liquid, the sector angles of the respective plates exposed to the air and the sector angles of the parts 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 capacitance value formed by the semicircular metal plate and the semicircular metal plate opposite to the same sector angle is measured change to obtain the inclination value. 2. a concentric coplanar bisecting ring-bisecting circle nested pole plate inclination measuring device, comprising capacitance measuring unit (14) and inclination calculation unit (15), described capacitance measuring unit (14) and inclination calculation The unit (15) is connected; 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 a cylindrical container (7) that is open at one end is sealed and assembled with a circle shaped insulating substrate (6), in the cavity of the cylindrical container (7) is located on the inner side of the circular insulating substrate (6) equipped with a ring-shaped coplanar capacitance probe (1); the ring-shaped coplanar capacitance probe (1) It consists of two semicircular metal plates (2, 3) and two semicircular annular metal plates (4, 5), wherein the two semicircular annular metal plates (4, 5) are arranged on the two semicircular metal plates (2 , 3) the outer side, and two semi-circular metal plates (4, 5) are coplanar and concentric with the two semi-circular metal plates (2, 3), and the two semi-circular metal plates (4, 5) are circumferentially Evenly distributed and one-to-one correspondence with the two semicircular metal plates (2, 3); four potential lead wires (9, 10, 11, 12) connect the two semicircular metal plates (2, 3), two Two semicircular annular metal plates (4, 5) are connected with the input end of capacitance measurement unit (14); Described cylindrical container (7) is horizontally placed, and in described cylindrical container (7), sealing injection accounts for cylindrical container (7) One-half volume of insulating liquid (8). 3. The concentric coplanar bisecting ring-bisecting circle nested polar plate inclination measuring device according to claim 2, characterized in that: the circular insulating substrate (6) is made of resin glass fiber material . 4. The concentric coplanar bisecting ring-bisecting circle nested plate inclination measuring device according to claim 2, characterized in that: the insulating liquid (8) is made of methanol, ethanol, isopropyl Alcohol alcohols, acetone, butanone ketones, diethylene glycol monobutyl ether ethers in combination of one or more liquid.