CN109974596A - A kind of linear displacement measurement device - Google Patents
A kind of linear displacement measurement device Download PDFInfo
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- CN109974596A CN109974596A CN201910349564.9A CN201910349564A CN109974596A CN 109974596 A CN109974596 A CN 109974596A CN 201910349564 A CN201910349564 A CN 201910349564A CN 109974596 A CN109974596 A CN 109974596A
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- imaging section
- generating unit
- line
- structured light
- displacement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a kind of linear displacement measurement devices, including light generating unit, imaging section and data processing division, light generating unit is used to issue line-structured light to imaging section, imaging section is imaged line-structured light for receiving line-structured light, and data processing division is used to calculate displacement between light generating unit and imaging section according to being subjected to displacement line-structured light image formed by the imaging section of front and back between light generating unit and imaging section.Linear displacement measurement device of the present invention is by being imaged line-structured light, displacement is measured according to the cable architecture image change for being subjected to displacement front and back, it can guarantee measurement accuracy, it can be avoided the disadvantage that grating scale strain line etching technics is complicated, working condition is harsh, cost of manufacture is relatively high compared with prior art, also avoid the magnetic railings ruler disadvantage poor to live magnetic signal anti-interference ability.
Description
Technical field
The present invention relates to machine vision application technology fields, more particularly to a kind of linear displacement measurement device.
Background technique
In equipment manufacture industry field, common linear displacement transducer is grating scale and magnetic railings ruler, and the principle of grating scale is
It is moved at it and is carved with grating code channel on ruler, straight-line displacement is distinguished using the code channel on dynamic ruler, code channel is divided into absolute type code channel and increasing
Amount formula code channel, absolute type code channel are the strain lines scribed on dynamic ruler according to absolute coding method, and the line pattern of each position is
Absolutely unique；Increment type grating scale is to scribe uniform strain line on dynamic ruler, is segmented and is read and counting to Moire fringe
Incremental displacement relative to benchmark zero point.Magnetic railings ruler is to be put into magnetic according to specific rule in magnetic stripe according to electromagnetic induction principle
Pole generates the magnetic signal of specific rule, alternating magnetic field relevant to displacement is converted to alternate electrical signal, according to the alternation of acquisition
Electric signal obtains displacement measurement data.
However, code channel is opaque strain line group of same size by transparent strain line and therewith on the dynamic ruler and scale of grating scale
At these strain lines can seriously affect its measurement performance, and the etching work of strain line once being disseminated by dust covering or grease stain
Skill is complicated, and working condition is harsh, so that the cost of production grating scale is relatively high.And magnetic railings ruler measures essence compared with grating scale
It spends low, and is easy to be interfered by magnetic signal in industry spot, to the poor anti jamming capability of magnetic signal.
Summary of the invention
In view of the above, the object of the present invention is to provide a kind of linear displacement measurement devices, are guaranteeing measurement accuracy
In the case of, it can be avoided the disadvantage that grating scale complex manufacturing technology, working condition are harsh, cost of manufacture is relatively high, also avoid
The magnetic railings ruler disadvantage poor to live magnetic signal anti-interference ability.
To achieve the above object, the invention provides the following technical scheme:
A kind of linear displacement measurement device, including light generating unit, imaging section and data processing division, the smooth generating unit are used for
Line-structured light is issued to the imaging section, the imaging section is imaged line-structured light for receiving line-structured light, the data
Processing unit is used for according to knot formed by the imaging section described before and after being subjected to displacement between the smooth generating unit and the imaging section
Structure light image calculates the displacement between the smooth generating unit and the imaging section.
Preferably, the data processing division is specifically used for calculating the smooth generating unit and the imaging section according to the following formula
Between displacement:
Δ L=L-L0=k (l-l0)；
Wherein, Δ L indicates the displacement between light generating unit and imaging section, L expression be subjected to displacement rear light generating unit and at
The distance between picture portion, l indicate the line-structured light length for being subjected to displacement the reflection of line-structured light image formed by rear imaging section, L0Table
Show the distance between light generating unit and imaging section before being subjected to displacement, l0Line-structured light figure formed by imaging section before expression is subjected to displacement
As the line-structured light length of reflection, k indicates parameter preset.
Preferably, the method for acquisition parameter preset k includes:
Be arranged the distance between the smooth generating unit and described imaging section be the first preset value, and record described in this position at
The line-structured light length of the reflection of the line-structured light image as formed by portion；
The distance between the smooth generating unit and the imaging section is arranged in the mobile smooth generating unit or the imaging section
For the second preset value, and record the line-structured light length of the reflection of line-structured light image formed by imaging section described in this position；
Parameter preset k is calculated according to the following formula:
Wherein, L1Indicate the first preset value, L2Indicate the second preset value, l1Indicate between light generating unit and imaging section away from
The line-structured light length that imaging section measures when from for the first preset value, l2Indicate that the distance between light generating unit and imaging section are the
The line-structured light length that imaging section measures when two preset values.
Preferably, the smooth generating unit and the imaging section are arranged on guide rail, can move along guide rail.
Preferably, the smooth generating unit is provided with pedestal and is mounted on guide rail by pedestal, and the imaging section is provided with
It pedestal and is mounted on guide rail by pedestal.
Preferably, the smooth generating unit includes laser, and the imaging section includes imaging sensor.
As shown from the above technical solution, linear displacement measurement device provided by the present invention includes light generating unit, imaging section
And data processing division, light generating unit are used to issue line-structured light to imaging section, imaging section is for receiving line-structured light and to knot
The imaging of structure light, data processing division are used for according to formed by the imaging section described before and after being subjected to displacement between light generating unit and imaging section
Line-structured light image calculates the displacement between light generating unit and imaging section.Linear displacement measurement device of the present invention passes through to line
Structure light imaging measures displacement according to the cable architecture image change for being subjected to displacement front and back, can guarantee measurement accuracy, with existing skill
Art compares the disadvantage that can be avoided that grating scale complex manufacturing technology, working condition are harsh, cost of manufacture is relatively high, also avoids magnetic
The grid ruler disadvantage poor to live magnetic signal anti-interference ability.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of schematic diagram of linear displacement measurement device provided in an embodiment of the present invention；
Fig. 2 is the method flow diagram that parameter preset k is obtained in the embodiment of the present invention.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work, all should belong to protection of the present invention
Range.
A kind of linear displacement measurement device provided in an embodiment of the present invention includes light generating unit, imaging section and data processing
Portion, the smooth generating unit are used to issue line-structured light to the imaging section, and the imaging section is for receiving line-structured light and to line
Structure light imaging, the data processing division are used for basis and are subjected to displacement front and back institute between the smooth generating unit and the imaging section
It states line-structured light image formed by imaging section and calculates displacement between the smooth generating unit and the imaging section.
Line-structured light refers to that the shape of beam cross-section is linear light, the cable architecture that light generating unit projects in the present apparatus
The length of its cross section of light immobilizes in measurement process, and the line-structured light projected has the angle of divergence, is measuring
The Cheng Zhongqi angle of divergence immobilizes.
Before being subjected to displacement between light generating unit and imaging section and after being subjected to displacement, imaging section respectively throws light generating unit
The line-structured light of injection is imaged, the line-structured light image that data processing division obtains twice according to imaging section calculate light generating unit and
Displacement between imaging section.
Therefore, the present embodiment linear displacement measurement device is by being imaged line-structured light, according to the line for being subjected to displacement front and back
Structural images change and measure displacement, can guarantee measurement accuracy, and can be avoided grating scale manufacture craft compared with prior art
Disadvantage complicated, working condition is harsh, cost of manufacture is relatively high, also avoids magnetic railings ruler to live magnetic signal anti-interference ability ratio
Poor disadvantage.
This linear displacement measurement device is described in detail with reference to the accompanying drawings and detailed description.Referring to FIG. 1,
Fig. 1 is a kind of schematic diagram of linear displacement measurement device provided in this embodiment, be can be seen that according to figure, this straight-line displacement measurement dress
It sets including light generating unit 10, imaging section 11 and data processing division.
Light generating unit 10 is used to issue line-structured light to imaging section 11, and preferred light generating unit 10 can use laser.
Imaging section 11 is imaged line-structured light for receiving line-structured light, obtains line-structured light image.Optionally, imaging section 11 can adopt
Use imaging sensor.
Data processing division is used for according to before and after being subjected to displacement between the smooth generating unit 10 and the imaging section 11
Line-structured light image formed by imaging section 11 calculates the displacement between the smooth generating unit 10 and the imaging section 11.It is answering
It, can be by the light generating unit 10 of the present apparatus or imaging section 11 and testee phase when measuring displacement with this linear displacement measurement device
To still connecting, drive light generating unit 10 or imaging section 11 mobile when testee is mobile, make light generating unit 10 and at
As relative displacement occurs between portion 11, the displacement between the light generating unit measured and imaging section is the displacement of testee
Amount.
Specifically, data processing division is specifically used for calculating the displacement between light generating unit and imaging section according to the following formula
Amount:
Δ L=L-L0=k (l-l0)；
Wherein, Δ L indicates the displacement between light generating unit and imaging section, L expression be subjected to displacement rear light generating unit and at
The distance between picture portion, l indicate the line-structured light length for being subjected to displacement the reflection of line-structured light image formed by rear imaging section, L0Table
Show the distance between light generating unit and imaging section before being subjected to displacement, l0Line-structured light figure formed by imaging section before expression is subjected to displacement
As the line-structured light length of reflection, k indicates parameter preset.In practical applications, light generating unit before being subjected to displacement can be set
Or imaging section is in dead-center position, such as using light generating unit and imaging section setting between each other apart from lesser position as
Dead-center position, light generating unit and imaging section are measurement position after relative displacement occurs.
Further specifically, referring to FIG. 2, obtain parameter preset k method the following steps are included:
S20: setting the distance between the smooth generating unit and the imaging section are the first preset value, and record this position institute
State the line-structured light length of the reflection of line-structured light image formed by imaging section.
Illustratively, light generating unit 10 and imaging section 11 can be arranged in dead-center position, there is a spy between the two
Set a distance L1, precision instrument can be used in the specific implementation and measure between current location time generating unit 10 and imaging section 11
Distance L1, and it is recorded in the line-structured light length l that this distance line-structured light image according to formed by imaging section measures1。
S21: the mobile smooth generating unit or the imaging section are arranged between the smooth generating unit and the imaging section
Distance is the second preset value, and records the line-structured light length of the reflection of line-structured light image formed by imaging section described in this position.
Mobile light generating unit 10 or imaging section 11, make the two between the two apart from remote position, use precision
Apparatus measures go out the distance between current location time generating unit 10 and imaging section 11 L2, and this distance is recorded according to imaging
The line-structured light length l that line-structured light image formed by portion measures2。
S22: parameter preset k is calculated according to the following formula:
Wherein, L1Indicate the first preset value, L2Indicate the second preset value, l1Indicate between light generating unit and imaging section away from
The line-structured light length that imaging section measures when from for the first preset value, l2Indicate that the distance between light generating unit and imaging section are the
The line-structured light length that imaging section measures when two preset values.
Optionally, light generating unit 10 and imaging section 11 can be arranged on guide rail 12 in the present embodiment, the two can be along guide rail
12 is mobile, can be by light generating unit 10 or imaging section 11 and measured object in application this linear displacement measurement device measurement displacement
Body connects opposing stationaryly, drives light generating unit 10 or imaging section 11 mobile when testee is mobile, to realize measurement
The displacement of testee.Further specifically, light generating unit 10 is provided with pedestal and is mounted on guide rail by pedestal, imaging section
11 are provided with pedestal and are mounted on guide rail by pedestal.
A kind of linear displacement measurement device provided by the present invention is described in detail above.Tool used herein
Principle and implementation of the present invention are described for body example, the above embodiments are only used to help understand this hair
Bright method and its core concept.It should be pointed out that for those skilled in the art, not departing from the present invention
, can be with several improvements and modifications are made to the present invention under the premise of principle, these improvement and modification also fall into right of the present invention
It is required that protection scope in.
Claims (6)
1. a kind of linear displacement measurement device, which is characterized in that including light generating unit, imaging section and data processing division, the light
Generating unit is used to issue line-structured light to the imaging section, the imaging section for receive line-structured light and to line-structured light at
Picture, the data processing division are used for according to imaging section described before and after being subjected to displacement between the smooth generating unit and the imaging section
Formed line-structured light image calculates the displacement between the smooth generating unit and the imaging section.
2. linear displacement measurement device according to claim 1, which is characterized in that the data processing division is specifically used for root
The displacement between the smooth generating unit and the imaging section is calculated according to following formula:
Δ L=L-L0=k (l-l0)；
Wherein, Δ L indicates the displacement between light generating unit and imaging section, and L expression is subjected to displacement rear light generating unit and imaging section
The distance between, l indicates the line-structured light length for being subjected to displacement the reflection of line-structured light image formed by rear imaging section, L0Indicate hair
It is raw to be displaced preceding the distance between light generating unit and imaging section, l0Line-structured light image formed by imaging section is anti-before expression is subjected to displacement
The line-structured light length reflected, k indicate parameter preset.
3. linear displacement measurement device according to claim 2, which is characterized in that obtain parameter preset k method include:
It is the first preset value that the distance between the smooth generating unit and described imaging section, which is arranged, and records imaging section described in this position
The line-structured light length of formed line-structured light image reflection；
The mobile smooth generating unit or the imaging section, setting the distance between the smooth generating unit and the imaging section are the
Two preset values, and record the line-structured light length of the reflection of line-structured light image formed by imaging section described in this position；
Parameter preset k is calculated according to the following formula:
Wherein, L1Indicate the first preset value, L2Indicate the second preset value, l1Indicate that the distance between light generating unit and imaging section are
The line-structured light length that imaging section measures when the first preset value, l2Indicate that the distance between light generating unit and imaging section are second pre-
If the line-structured light length that imaging section measures when value.
4. linear displacement measurement device according to claim 1, which is characterized in that the smooth generating unit and the imaging section
It is arranged on guide rail, can be moved along guide rail.
5. linear displacement measurement device according to claim 4, which is characterized in that the smooth generating unit be provided with pedestal and
It is mounted on guide rail by pedestal, the imaging section is provided with pedestal and is mounted on guide rail by pedestal.
6. linear displacement measurement device according to claim 1, which is characterized in that the smooth generating unit includes laser,
The imaging section includes imaging sensor.
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| CN201910349564.9A CN109974596B (en) | 2019-04-28 | 2019-04-28 | Linear displacement measuring device |
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|---|---|---|---|
| CN201910349564.9A CN109974596B (en) | 2019-04-28 | 2019-04-28 | Linear displacement measuring device |
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