CN209820405U

CN209820405U - Remote displacement measuring device based on passive target

Info

Publication number: CN209820405U
Application number: CN201920441904.6U
Authority: CN
Inventors: 高文武; 范文斌; 郭敏
Original assignee: Xi'an Sensitive Measurement And Control Technology Co Ltd
Current assignee: Xi'an Sensitive Measurement And Control Technology Co Ltd
Priority date: 2019-04-03
Filing date: 2019-04-03
Publication date: 2019-12-20
Anticipated expiration: 2029-04-03

Abstract

The utility model discloses a remote displacement measuring device based on a passive target, which comprises an illumination unit (8), an optical lens (1), an image sensor (2), a control unit (5) and a passive reflector (3) arranged on a measuring target; the illumination unit (8) is arranged near the optical lens (1) and illuminates the passive reflection device (3); the image sensor (2) images the passive reflector (3) through the optical lens (1), the control unit (5) controls signal triggering, image storage and processing of the image sensor (2), extracts image signals of the passive reflector (3) on the target, and calculates displacement parameters of the measured target. The utility model discloses a detect the light that sets up passive reflector reflection lighting element on the measurement object, gain the position of check point parameter of change over time to obtain the displacement of target through the analysis calculation, interference immunity is strong, and the setting of passive reflector is nimble convenient.

Description

Remote displacement measuring device based on passive target

Technical Field

The utility model relates to a mechanical measurement technical field relates to a displacement and deformation measuring device that can be used to targets such as bridge, dam, structure, especially relates to a long-range displacement measurement device based on passive target.

Background

Since the appearance of solid image sensors in the last 70 s of the last century, many scholars at home and abroad use image sensors such as a CCD (charge coupled device) as media to research the deformation measurement of bridges and concrete beams by using an image processing technology. The chinese patent with application number 200820241096.0, "a bridge dynamic displacement measuring device based on machine vision", discloses a measuring device for measuring dynamic deformation of a bridge by combining a laser source and a CCD, and calculates deformation parameters of the bridge by recording the position change of a laser beam in the deformation process of the bridge with the CCD at the far end of the bridge. The main problems of the current displacement sensors are as follows: the CCD image sensor needs to be used in conjunction with a collimated laser, increasing the complexity of the system.

Chinese patent No. CN203893821 discloses a remote displacement measuring device, which uses an image sensor to obtain an image of a target on a measured target, and obtains displacement parameters of a bridge through image processing, and an embedded remote displacement sensor based on the image sensor monitors the position of the target point on the target such as the bridge and the like as time-varying parameters through an optical imaging method, and obtains the displacement of the target through analysis and calculation. The shortcoming of this scheme is that the target needs the self-luminescence, if adopt the LED or LD lamp area of adding power up as the target, it is inconvenient to install on measuring targets such as bridge, and with high costs and difficult construction when setting up the power supply line for LED or LD lamp area, and the practicality is poor.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a remote displacement measurement device of passive target sets up passive reflection device on the measurand target, images on the imaging element after lighting unit shines, through detecting passive device image position parameter that changes with time to the displacement that obtains measuring targets such as bridge through the analysis calculation, solved the inconvenient problem of power supply of above-mentioned active target.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a remote displacement measuring device based on a passive target comprises an illumination unit, an optical lens, an image sensor, a control unit and a plurality of passive reflection devices arranged on a measuring target; the illumination unit is arranged near the optical lens and illuminates the passive reflection device; the image sensor images the passive reflector through the optical lens, the control unit controls signal triggering, image storage and processing of the image sensor, extracts image signals of the passive reflector on the target, and calculates displacement parameters of the measured target.

In the remote displacement measuring device based on the passive target, at least two targets which are arranged along the horizontal direction and have known spacing are included in the plurality of passive reflection devices.

In the above remote displacement measuring device based on the passive target, at least one of the passive reflection devices includes a group of target line columns orthogonally arranged along the horizontal and vertical directions.

In the remote displacement measuring device based on the passive target, the passive reflector is a reflecting membrane, a reflecting membrane sticker or a metal reflecting sheet.

In the remote displacement measuring device based on the passive target, the illumination unit is a near-infrared LED or LD invisible to human eyes, and a focusing lens is arranged in front of the illumination unit.

In the remote displacement measuring device based on the passive target, the remote displacement measuring device further comprises the remote communication unit, and the remote communication unit is electrically connected with the control unit to realize remote transmission of displacement data.

In the above remote displacement measuring device based on the passive target, the remote communication unit is a wireless GPRS system or a 4G wireless communication network module.

In the remote displacement measuring device based on the passive target, the control unit adopts an embedded structure.

In the above remote displacement measuring device based on the passive target, the image sensor is a CCD or CMOS sensor.

The utility model has the advantages as follows:

1. the utility model discloses a passive reflection device replaces current active lamp area to install on the measurand target, and the image sensor of distal end acquires passive reflection device's image to the displacement that obtains the measurand target is calculated, overcome installation, debugging, the inconvenient defect of mains operated that present active target exists, can rely on daylight illumination formation of image daytime, carry out the light filling through outside lighting unit night, also practiced thrift the energy consumption relatively. Meanwhile, the lighting unit can be integrated with the optical lens and the image sensor, the optical axes of the lighting light and the imaging light are kept consistent, and the lighting unit is convenient to debug and simple to operate in use.

2. The utility model discloses a passive reflector adopts array, includes at least that two are arranged and the known target of interval along the horizontal direction, has adapted to the long-range displacement of large-scale components such as bridge and generally for the characteristics that the displacement is the vertical direction, and two target intervals are known moreover, can be used for as the scaling factor in image processing and displacement calculation, realize the accurate absolute measurement of displacement. The target can also be set into an orthogonal linear array, so that the requirements of various occasions are met.

3. The utility model discloses an image sensor acquires the image of target on the target of measuration, and obtain the displacement parameter of bridge through image processing, it is reliable to have simple structure, two-dimentional real-time measurement, measuring range is big, characteristics such as low price, core control function unit adopts embedded system, make whole displacement sensor compact structure reliable, the integration, convenient application, remote communication transmission unit, can pass through the GPRS system with the measuring result, wireless transmission system such as 4G wireless network or wired transmission system such as optical cable, transmit the room on duty to the distal end, long-range unmanned on duty's all-weather field work requirement has been satisfied, be applicable to and close for a long time, on-line, the multiple spot is measured.

Drawings

FIG. 1 is a schematic view of the structure principle of the measuring device of the present invention;

FIG. 2 is a schematic view of the measuring device of the present invention;

fig. 3 is the schematic view of the installation position of the target of the present invention.

In the figure: 1-an optical lens; 2-an image sensor; 3-a passive reflective device; 4-a remote communication unit; 5-a control unit; 6-processing the storage unit; 7-a remote displacement sensor; 8-a lighting unit; 9-target under test.

Detailed Description

In order to make the technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1 and 2, the utility model discloses remote displacement measurement device of passive target includes remote displacement sensor 7, lighting unit 8 and sets up passive reflector 3 on measuring the target, and remote displacement sensor 7 includes optical lens 1, image sensor 2, the control unit 5, remote communication unit 4 and processing memory cell.

The illumination unit 8 is arranged at the position of the optical lens 1, is integrated with the optical lens 1 and the image sensor 2 into an integrated design, is more convenient to construct and debug, and performs light supplement illumination on the passive reflector 3 at night; the image sensor 2 images the passive reflection device 3 through the optical lens 1, the control unit 5 controls signal triggering and image storage processing of the image sensor 2, extracts an image signal of the passive reflection device 3 on the measured target 9, and calculates to obtain a displacement parameter of the measured target.

In fig. 3, at least two passive reflection devices 3 are arranged in the horizontal direction and have a known distance therebetween, and generally when the deflection of a target 9 to be measured such as a bridge is measured, a target needs to be mounted thereon, a remote image sensor is used to obtain the displacement variation of the target on the image sensor, and the deflection variation parameter of the bridge is obtained through conversion. In the measurement, the image sensor simultaneously obtains images of two passive reflection devices 3 with known distances, namely, the correction coefficient of the whole image sensor 2 can be obtained through the pixel distance on the CCD, so that the displacement change value of a certain passive reflection device 3 can be calculated according to the correction coefficient as long as the pixel position change value of the passive reflection device 3 on the image sensor 2 is obtained through measurement, and the deflection change value of the bridge is obtained as the positions of the passive reflection device 3 and the bridge are kept constant. And the displacement parameter of the general bridge is the vertical direction, so two passive reflection devices 3 arranged along the horizontal direction are taken as the calibration points.

As a special implementation mode, at least one group of passive reflection device lines which are orthogonally arranged along the horizontal direction and the vertical direction is included in the plurality of passive reflection devices 3, and the situation can meet the deformation and displacement measurement requirements of special measured objects such as large buildings and the like. The multiple measuring points and the multiple passive reflectors can be flexibly arranged in an array mode, multiple groups of detection parameters are obtained at the same time, the detection range is wide, the detection precision is greatly improved, the construction is convenient, and wires do not need to be laid for power supply like an active target. The passive reflector 3 of the target to be detected is a measuring point without a signal source, is not influenced by the strength of a signal source, and works only by receiving a reflected light signal of the passive reflector by the image sensor.

The utility model discloses an illumination element 8 is the invisible near infrared LED of people's eye or LD, can not produce light pollution, is provided with focusing lens before the illumination element. The detection device is started when in detection and is closed when in no need of detection so as to save energy.

The optical lens 1 aims at the passive reflector 3 arranged on the measured target, the zoom lens can be selected in application, targets with different distances and different sizes are imaged on the image sensor, the working mode has good adaptability to the measured target and has the characteristic of large measuring range, and the image sensor 2 is a CCD or CMOS sensor and is used for acquiring the image of the measured target in real time.

The remote communication unit 4 is electrically connected with the processing and storage unit 6 and is used for remotely transmitting the image data. The remote communication unit 4 can be a wireless GPRS system, a wireless network transmission module or a cable transmission system such as an optical cable and the like, transmits the measurement result to a remote duty room, and meets the requirement of all-weather field work of remote unattended operation. The processing and storing unit 6 comprises a Flash memory and a 32-bit ARM processor, and is used for storing and processing image data.

The core control function unit 5 adopts an embedded structure and is integrally designed. The single chip microcomputer STM32F429 or a similar chip is adopted, and the main functions of the single chip microcomputer STM32F429 or the similar chip are used for realizing triggering control of the image sensor and storage and processing control of image data. The remote displacement sensor does not work at ordinary times, and only when an external trigger signal comes, the core control function unit 5 sends the trigger signal, the image sensor starts to work, and therefore the pressure of data storage and data transmission is reduced.

It should be noted that, the utility model discloses a measurement system requires not highly to passive reflector 3, can make the specific pattern of being surveyed target self by reflection diaphragm, reflectance coating sticker or metal reflector, and through the on-demand switch of control lighting unit 8, realize 24 hours all-weather work to have the characteristic that the characteristic target draws convenience and the degree of accuracy is high, measurement accuracy also correspondingly improves. In application, a target is installed or selected on a measured target, and a remote displacement sensor is fixed on a pier or other far position with negligible deformation.

The utility model discloses having obtained using in bridge displacement detection, measurement accuracy is the mm level, and time resolution is 10ms level.

The foregoing is a more detailed description of the present invention taken in conjunction with the accompanying drawings, which are not intended to limit the invention to the particular embodiments described herein. For those skilled in the art to which the invention pertains, equivalent substitutes or obvious modifications may be made without departing from the spirit of the invention, and the same properties or uses are deemed to be within the scope of the invention as determined by the claims as filed.

Claims

1. The utility model provides a long-range displacement measurement device based on passive target which characterized in that: the device comprises a lighting unit (8), an optical lens (1), an image sensor (2), a control unit (5) and a plurality of passive reflection devices (3) arranged on a measurement target; the illumination unit (8) illuminates the passive reflector (3); the image sensor (2) images the passive reflection device (3) through the optical lens (1), the control unit (5) controls signal triggering and image storage processing of the image sensor (2), extracts image signals of the passive reflection device (3) on the target, and calculates displacement parameters of the measured target.

2. The passive target-based remote displacement measurement device of claim 1, wherein: the plurality of passive reflection devices (3) at least comprise two passive reflection devices (3) which are arranged along the horizontal direction and have known intervals.

3. The passive target-based remote displacement measurement device of claim 1 or 2, wherein: the plurality of passive reflection devices (3) at least comprise a group of passive reflection device line columns which are orthogonally arranged along the horizontal direction and the vertical direction.

4. The passive target-based remote displacement measurement device of claim 1 or 2, wherein: the passive reflector (3) is a reflecting membrane, a reflecting film sticker, a plastic reflector or a metal reflector.

5. The passive target-based remote displacement measurement device of claim 1 or 2, wherein: the lighting unit (8) is a near-infrared LED or LD which can not be seen by human eyes, and a focusing lens is arranged in front of the lighting unit.

6. The passive target-based remote displacement measurement device of claim 1 or 2, wherein: the remote displacement measuring device also comprises a remote communication unit, wherein the remote communication unit is electrically connected with the control unit (5) to realize remote transmission of displacement data.

7. The passive target-based remote displacement measurement device of claim 6, wherein: the remote communication unit is a GPRS system, a wireless network transmission system or a wired transmission system.

8. The passive target-based remote displacement measurement device of claim 1 or 2, wherein: the image sensor (2) is a CCD or CMOS sensor.