CN212482397U - Displacement sensor - Google Patents

Abstract

The application relates to a displacement sensor belongs to computer technology field, displacement sensor includes: the device comprises a light emitting diode, a lens assembly, an optical sensor and a control chip; the lens assembly comprises a first lens and a second lens, the first lens transmits light emitted by the light emitting diode to the loading floor, and the second lens focuses the light passing through the loading floor to the optical sensor. The problem of low measurement precision in the existing scheme is solved, and meanwhile, the moving displacement and the moving direction of the goods can be accurately obtained only through a displacement sensor; in addition, the displacement sensor obtained by packaging is used for measuring the moving direction and the moving displacement of the goods, so that the anti-interference capability is improved, and possible application scenes are enlarged.

Description

Displacement sensor

Technical Field

The application relates to a displacement sensor, and belongs to the technical field of computers.

Background

The traditional displacement sensor generally uses technologies such as resistance type, inductance type, capacitance type, Hall type photoelectric type and radio positioning type, which have various characteristics but also have respective limitations, and particularly, the radio positioning type sensor has insufficient displacement measurement precision and radio wave radiation to space, which is not beneficial to use in special places.

SUMMERY OF THE UTILITY MODEL

The application provides a displacement sensor, which can solve the problems in the existing scheme. The application provides the following technical scheme:

in a first aspect, there is provided a displacement sensor comprising: the device comprises a light emitting diode, a lens assembly, an optical sensor and a control chip;

the lens assembly comprises a first lens and a second lens, the first lens transmits light emitted by the light emitting diode to the loading floor, and the second lens focuses the light passing through the loading floor to the optical sensor.

Optionally, the first lens is a prism.

Optionally, the second lens is a micro-focus lens.

Optionally, the light emitting diode is a laser irradiator.

In a second aspect, a cargo displacement monitoring method is provided, where the cargo displacement monitoring method is used in the displacement sensor of the first aspect, and the method includes:

acquiring a first image of the displacement sensor when the goods are at an initial position;

acquiring a second image of the displacement sensor after the cargo moves;

and acquiring the motion displacement of the cargo according to the first image and the second image.

Optionally, the acquiring the motion displacement of the cargo according to the first image and the second image includes:

determining the moving direction and the moving displacement of the displacement sensor according to the first image and the second image;

and determining the moving direction and the moving displacement of the goods according to the moving direction and the moving displacement.

Optionally, the determining the moving direction and the moving displacement of the cargo according to the moving direction and the moving displacement includes:

calculating the displacement of the cargo on the x axis according to the moving displacement of the displacement sensor on the x axis direction and the size of the image source;

calculating the displacement of the cargo on the y axis according to the moving displacement of the displacement sensor on the y axis direction and the size of the image source;

and calculating the movement displacement and the movement direction of the cargo according to the displacement of the cargo on the x axis and the displacement of the cargo on the y axis.

Optionally, the method further includes:

and sending out prompt information when the displacement of the goods moving in the preset direction reaches a first preset threshold value.

Optionally, the method further includes:

and when the displacement of the goods moving in the preset direction reaches a second preset threshold value, sending alarm information.

The beneficial effect of this application lies in:

the displacement sensor is integrated by integrating the light emitting diode, the lens assembly, the optical sensor and the control chip, so that the problem of low measurement precision in the existing scheme is solved, and meanwhile, the movement displacement and the movement direction of the goods can be accurately obtained only through the displacement sensor; in addition, the displacement sensor obtained by packaging is used for measuring the moving direction and the moving displacement of the goods, so that the anti-interference capability is improved, and possible application scenes are enlarged.

The foregoing description is only an overview of the technical solutions of the present application, and in order to make the technical solutions of the present application more clear and clear, and to implement the technical solutions according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present application and the accompanying drawings.

Drawings

Fig. 1 is a schematic view of a displacement sensor according to the present invention;

fig. 2 is a schematic diagram of a control chip in the displacement sensor of the present invention;

FIG. 3 is a schematic view of the displacement sensor of the present invention installed in a cargo object;

fig. 4 is a method flowchart of the cargo displacement monitoring method of the present invention;

FIG. 5 is a schematic diagram of displacement synthesis according to the present invention;

fig. 6 is a schematic diagram of the present invention when two displacement sensors are provided.

Detailed Description

The following detailed description of embodiments of the present application will be described in conjunction with the accompanying drawings and examples. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.

Referring to fig. 1, a schematic diagram of a displacement sensor according to an embodiment of the present application is shown, as shown in fig. 1, the displacement sensor includes:

a light emitting diode 101, a lens assembly 102, an optical sensor 103 and a control chip 104.

The light emitting diode 101 is a laser irradiator. The laser irradiator has the characteristics of stable light source, strong anti-interference capability and high measurement precision (generally reaching more than 63 microns and reaching 30 microns at most). Meanwhile, compared with the common light, the laser irradiator has higher monochromaticity and linearity, and avoids the problem of color blindness caused by low light emissivity on the surfaces of certain colors due to different reflectivities of the common light on the surfaces of different colors, wherein the problem is caused by the fact that a control chip cannot identify the surfaces of certain colors.

The lens assembly 102 includes a first lens that transmits light from the light emitting diodes to the load floor and a second lens that focuses light passing through the load floor onto the optical sensor.

The first lens is a prism.

The second lens is a micro-focus lens. The second lens reduces the transmission light path of light by using the micro-focus lens, and overcomes the influence on the measurement result in severe environment.

The control chip 104 is a chip dedicated to image analysis, such as a DSP (Digital Signal Processing) chip, and is used to analyze and process an image acquired by the optical sensor, and further determine a moving direction and a moving displacement of the displacement sensor according to a change of a feature point in the image. Referring to fig. 2, a schematic diagram of the control chip 104 is shown.

The light emitted by the light emitting diode can illuminate the surface of the cargo object, and the light reflected by the surface of the cargo object is transmitted through the lens assembly to enter the optical sensor for imaging. Therefore, when the goods drive the displacement sensor to move, the moving track of the goods can be recorded into a coherent image by the optical sensor, and then the moving displacement and the moving direction of the goods are obtained through processing and analyzing by the control chip.

Referring to fig. 3, the displacement sensor is mounted on the goods to be monitored for displacement through the mounting base and the support arm and is rigidly connected to the goods, so that the displacement between the displacement sensor and the goods is not changed in position during transportation, and the accuracy of the movement displacement and the movement direction of the goods obtained through monitoring is further ensured. Meanwhile, the direction of the displacement sensor can be adjusted by adjusting the support arm, so that the measuring plane and the floor keep a certain pressure. Therefore, when the positions of the goods and the goods-carrying objects are changed, the displacement sensor can measure the moving displacement and the moving direction.

The displacement sensor is integrated by integrating the light emitting diode, the lens assembly, the optical sensor and the control chip, so that the problem of low measurement precision in the existing scheme is solved, and meanwhile, the movement displacement and the movement direction of the goods can be accurately obtained only through the displacement sensor; meanwhile, the displacement sensor obtained by packaging is used for measuring the moving direction and the moving displacement of the goods, so that the anti-interference capability is improved, and possible application scenes are enlarged.

Referring to fig. 4, a flowchart of a method for monitoring cargo displacement according to another embodiment of the present application is shown, where the method for monitoring cargo displacement is used in the displacement sensor shown in fig. 1, and as shown in fig. 4, the method includes:

step 401, acquiring a first image of the displacement sensor when the cargo is at an initial position;

after the power is on, the displacement sensor records the initial position information of the goods, and the recorded disposal position information is stored as a reference position.

Specifically, after the power is turned on, the light emitting diode in the displacement sensor emits light to irradiate the surface of the object to be carried, the light reaches the optical sensor after the light is transmitted through the lens assembly, and the optical sensor generates a first image.

Optionally, after the first image is obtained, a prompt message may be sent, where the prompt message may be a voice prompt or an indicator light prompt. For example, a beep of "tic" is issued.

Step 402, acquiring a second image of the displacement sensor after the movement of the cargo;

and in the moving process of the cargo object, the displacement sensor measures and caches the acquired second image data in real time.

And 403, acquiring the motion displacement of the cargo according to the first image and the second image.

And comparing the second image acquired in real time with the first image initially stored, and determining the movement displacement of the goods according to the comparison result. Wherein, this step can include:

firstly, determining the moving direction and the moving displacement of the displacement sensor according to the first image and the second image;

and determining the movement displacement of the displacement sensor in the x-axis direction and the movement displacement of the displacement sensor in the y-axis direction according to the first image and the second image.

Secondly, determining the moving direction and the moving displacement of the goods according to the moving direction and the moving displacement.

The moving displacement of the goods on the x axis is determined according to the moving displacement of the displacement sensor on the x axis direction, the moving displacement of the goods on the y axis is determined according to the moving displacement of the displacement sensor on the y axis direction, and then the moving displacement and the moving direction of the goods are obtained through synthesis according to the displacements of the goods on the x axis and the y axis. Please refer to fig. 5, which shows a schematic diagram of a possible displacement combination.

It should be noted that the product of the displacement amount of the displacement sensor in different directions and the size of the image source may be used as the movement displacement of the cargo moving in the direction. Alternatively, the image source sizes of different displacement sensors are different, and can be determined according to the resolution of the displacement sensors. In addition, the signal transmission of the displacement sensor is a standard serial port, and the whole data is divided into 8 character segments, wherein the 7 th character segment is the movement displacement on the x axis, and the 8 th character segment is the movement displacement on the y axis, so that the data can be directly read from the 7 th bit and the 8 th bit of the character segments, and the description is omitted.

In the above embodiment, when the displacement of the cargo moving in the preset direction reaches the first preset threshold, a prompt message may be sent. The prompt information can be a voice prompt or an indicator light prompt. The indication lamp is used for prompting to illustrate, when the goods do not displace, the indication lamp is green, and when the displacement of the indication lamp reaches a first preset threshold value, the indication lamp is yellow. When the displacement moving in the preset direction reaches a second preset threshold value, alarm information can be sent out. Wherein, alarm information can be for voice prompt also can be for the warning of pilot lamp. For example, still taking the indication of the indicator light as an example, when the displacement reaches the second preset threshold, the indicator light is red.

And the second preset threshold is greater than the first preset threshold.

For example, only one displacement sensor is used, and in practical implementation, please refer to fig. 6, a plurality of displacement sensors may be further provided, and at this time, the moving displacement of the cargo movement may be determined according to the measurement results of the two displacement sensors, which is not described herein again. Moreover, according to the actual application requirement, three or more displacement sensors may be provided, which is not described herein again.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (4)

1. A displacement sensor, characterized in that the displacement sensor comprises: the device comprises a light emitting diode, a lens assembly, an optical sensor and a control chip;

the lens assembly comprises a first lens and a second lens, the first lens transmits light emitted by the light emitting diode to the loading floor, and the second lens focuses the light passing through the loading floor to the optical sensor.

2. The displacement sensor of claim 1, wherein the first lens is a prism.

3. The displacement sensor of claim 1, wherein the second lens is a micro-focal lens.

4. The displacement sensor of claim 1, wherein the light emitting diode is a laser illuminator.

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