CN111595233A

CN111595233A - Non-magnetic sensor

Info

Publication number: CN111595233A
Application number: CN202010508959.1A
Authority: CN
Inventors: 马圣
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-07
Filing date: 2020-06-07
Publication date: 2020-08-28

Abstract

The invention relates to the technical field of meter measurement, in particular to a nonmagnetic sensor, wherein a PCB coil is arranged right above a metal sheet, the metal sheet is fixedly arranged on a rotating shaft and rotates along with the rotating shaft, the PCB coil comprises an exciting coil and a plurality of induction coils, the exciting coil and the induction coils are inductively coupled, the induction coils are positioned in the exciting coil, one ends of the induction coils are mutually connected at the same point, the other ends of the induction coils are connected to a signal amplifying unit, the signal amplifying unit is connected with a measuring device, the amplified signal measured by the measuring device is the influence value of the metal sheet rotating along with the rotating shaft on the induction coils, the difference S of the influence value is the distance L between the quantized metal sheet and the PCB coil, the direction and the angle of the metal sheet rotation can be measured, the distance between the metal sheet and the sensor can be quantized, the measuring speed is high, and the algorithm can be used, the distance is detected during design and production, and allowance is reserved for dealing with later environmental change, so that the stability of long-term operation is ensured.

Description

Non-magnetic sensor

Technical Field

The invention relates to the technical field of meter metering, in particular to a non-magnetic sensor.

Background

At present, in the measurement of a water-gas meter, the flow of liquid or gas drives a mechanical part to rotate, and a low-power consumption remote sensor is required to accurately convert the rotary motion into an electric signal and quantify the distance from a metal sheet to the sensor.

The prior art scheme is as follows: the patent number is ZL200680007522.8, the invention patent of induction type angular transducer adopts the mode of symmetrical coil pair output for the comparator, can not quantify the distance of sheetmetal to PCB coil, and the measuring distance is not far enough, and measuring speed is not fast enough, can not use the algorithm to correct when receiving the interference.

Because the distance from the metal sheet to the PCB coil cannot be quantified, the distance may exceed the detection distance due to environmental change in the critical position when the PCB coil leaves a factory, and the stability of long-term operation cannot be guaranteed.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: a non-magnetic sensor for detecting the distance and rotation of a metal sheet is provided.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a no magnetism sensor, includes sheetmetal, PCB coil and measuring device, the PCB coil is established directly over the sheetmetal, and the sheetmetal is fixed to be set up in the pivot to rotate along with the pivot, the PCB coil includes exciting coil and a plurality of induction coil, exciting coil and induction coil are inductive coupling, and induction coil is located exciting coil, and induction coil' S one end interconnect is in the same point, and the other end is connected to signal amplification unit, and signal amplification unit is connected with measuring device, and the enlarged signal that measuring device surveyed is the influence value of sheetmetal rotation to induction coil along with the pivot to know whether the sheetmetal is under certain induction coil, through a plurality of induction coil cooperations, can obtain sheetmetal direction of rotation and angle, the difference S of influence value is the interval L between quantization sheetmetal and the PCB coil.

Further, the distance L is the difference S between the maximum value a of the metal sheet not under the induction coil and the minimum value b of the metal sheet under the induction coil measured by the measuring device, the distance L is detected when the metal sheet is designed and produced, and allowance is reserved to deal with later environment changes, so that the stability of long-term operation is guaranteed.

Furthermore, in order to reduce the power consumption of the system and improve the detection rotating speed and the measurement accuracy of the system, the measuring device is an ADC measuring device for measuring the voltage signal of each induction coil after passing through the signal amplifying unit.

Further, in order to identify the accuracy of the rotation direction and angle of the metal piece, the number of the induction coils is 3 or more.

Further, the metal sheet is a partially metallized disk.

The invention has the beneficial effects that: the invention can measure the rotating direction and angle of the metal sheet, can also quantify the distance between the metal sheet and the sensor, has low power consumption and high measuring speed, can correct the interference by using an algorithm, and simultaneously can quantify the distance between the metal sheet and the PCB coil, and can ensure the stability of long-term operation by detecting the distance and reserving allowance to deal with the later environmental change during the design and production.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of the structure of the PCB coil of the present invention;

FIG. 3 is a schematic diagram of the detection of the present invention;

FIG. 4 is a graph of the effect of the rotating metal sheet on the AD value of the induction coil of the present invention.

In the figure: 1. the device comprises a metal sheet, 2 parts of a PCB coil, 21 parts of an exciting coil, 22 parts of an induction coil, 3 parts of a signal amplifying unit and 4 parts of a measuring device.

Detailed Description

The invention will now be described in further detail with reference to the drawings and preferred embodiments. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

As shown in figures 1-4, a non-magnetic sensor comprises a metal sheet 1, a PCB coil 2 and a measuring device 4, wherein the metal sheet 1 is a partially metallized disk, the PCB coil 2 is arranged right above the metal sheet 1, the metal sheet 1 is fixedly arranged on a rotating shaft and rotates along with the rotating shaft,

as shown in fig. 2, the PCB coil 2 includes an exciting coil 21 and a plurality of induction coils 22, the exciting coil 21 and the induction coils 22 are inductively coupled, the induction coils 22 are located in the exciting coil 21, the number of the induction coils 22 is 3 or more, one ends of the induction coils 22 are connected to the same point, the other ends of the induction coils 22 are connected to the signal amplifying unit 3, the signal amplifying unit 3 is connected to the measuring device 4, the amplified signal measured by the measuring device 4 is an influence value of the rotation of the metal sheet 1 along with the rotation shaft on the induction coils 22, and a difference S between the influence values is a distance L between the quantized metal sheet 1 and the PCB coil 2.

The distance L is the difference between the maximum value of the sheet metal 1 not under the induction coil 22 and the minimum value of the sheet metal 1 under the induction coil 22 measured by the measuring device 4.

The measuring device is an ADC measuring device for measuring the voltage signal of each induction coil 22 after passing through the signal amplifying unit 3.

The specific exciting coil 21 and a plurality of induction coils 22 are all arranged on the PCB coil 6, the metal sheet 1 is a partially metallized disk, in operation, the metal sheet 1 rotates along with the rotating shaft and shields the induction coils 22, the exciting signal 5 shown in figure 3 gives a pulse signal to the exciting coil 21, the pulse signal radiates an electromagnetic signal outwards through the exciting coil 21 according to a certain period, each induction coil 22 receives the induction signal, the amount of shielding of the metal sheet 1 is large, the magnetic flux of the induction coil 22 is changed, the induction signal has a large size, the induction signal is transmitted to the signal amplification unit 3, a signal AD value is obtained by an ADC sampling and measuring device (measuring device 4) after amplification, and the signal AD value can be seen: firstly, knowing whether the metal sheet 1 is under a certain induction coil according to the magnitude of the induction signal, comparing the measured AD value with a preset position coding table through the matching of a plurality of induction coils 22, and obtaining the rotating direction and the angle of the metal sheet 1 through the relation of state change;

II, secondly: as shown in fig. 4, it can be seen that the difference S between the influence value of the metal sheet 1 on the induction coil 22 is the difference between the maximum value a of the ADC of the metal sheet 1 not under the induction coil 22 and the minimum value b of the ADC of the metal sheet 1 under the induction coil 22, and the difference S is the distance L between the quantized metal sheet 1 and the PCB coil 2, and the smaller the difference, the farther the distance L.

And the excitation signal 5 is generated for a plurality of times during each measurement, the influence of each pulse is accumulated through the signal amplification unit 3, the weak signal amplification effect is achieved, and the influence of external interference on a single pulse can be weakened.

By last, not only can measure the rotatory direction and the angle of sheetmetal, still can quantify the sheetmetal to the distance of sensor, the low power dissipation, measuring speed is fast, can use the algorithm to correct when receiving the interference, simultaneously owing to can quantify the sheetmetal to the distance of PCB coil, through detecting this distance when design and production to leave the surplus and deal with the later stage environmental change, guarantee long-term operation's stability.

While particular embodiments of the present invention have been described in the foregoing specification, various modifications and alterations to the previously described embodiments will become apparent to those skilled in the art from this description without departing from the spirit and scope of the invention.

Claims

1. A non-magnetic sensor, characterized by: comprises a metal sheet (1), a PCB coil (2) and a measuring device (4), wherein the PCB coil (2) is arranged right above the metal sheet (1), the metal sheet (1) is fixedly arranged on a rotating shaft and rotates along with the rotating shaft,

the PCB coil (2) comprises an exciting coil (21) and a plurality of induction coils (22), the exciting coil (21) and the induction coils (22) are in inductive coupling, the induction coils (22) are located in the exciting coil (21), one ends of the induction coils (22) are connected to the same point, the other ends of the induction coils are connected to a signal amplification unit (3), the signal amplification unit (3) is connected with a measuring device (4), an amplification signal measured by the measuring device (4) is an influence value of the sheet metal (1) on the induction coils (22) along with rotation of a rotating shaft, and a difference S of the influence value is a distance L between the quantized sheet metal (1) and the PCB coil (2).

2. A non-magnetic sensor as defined in claim 1, wherein: the distance L is the difference S between the maximum value a of the metal sheet (1) not under the induction coil (22) and the minimum value b of the metal sheet (1) under the induction coil (22) measured by the measuring device (4).

3. A non-magnetic sensor as defined in claim 1, wherein: the measuring device is an ADC measuring device and is used for measuring voltage signals of each induction coil (22) after passing through the signal amplifying unit (3).

4. A non-magnetic sensor as defined in claim 1, wherein: the number of the induction coils (22) is 3 or more.

5. A non-magnetic sensor as defined in claim 1, wherein: the metal sheet (1) is a partially metallized disk.