CN111735398A - Device for measuring length of linear object - Google Patents
Device for measuring length of linear object Download PDFInfo
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- CN111735398A CN111735398A CN202010436232.7A CN202010436232A CN111735398A CN 111735398 A CN111735398 A CN 111735398A CN 202010436232 A CN202010436232 A CN 202010436232A CN 111735398 A CN111735398 A CN 111735398A
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- linear object
- bobbin
- light beam
- measured
- running
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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
- G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
- G01B11/043—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring length
Abstract
The invention belongs to the field of measurement, and particularly relates to a device for measuring the length of a linear object, which comprises a wire feeding device, a wire feeding device and a wire feeding device, wherein the wire feeding device comprises a driving wire barrel and a driven wire barrel, the linear object to be measured is wound on the driven wire barrel, one end of the linear object is fixedly arranged on the driving wire barrel, the driving wire barrel rotates to drive the driven wire barrel, and the linear object to be measured wound on the driven wire barrel is conveyed to the driving wire barrel; the optical measurement device is arranged between the driving line drum and the driven line drum and used for emitting a light beam on the surface of the moving linear object to be measured to obtain the running speed of the linear object to be measured in the running stroke, calculating the length of the running stroke of the linear object to be measured according to the running speed and the running time, summing the length of the running stroke of the linear object to be measured and the distance between the driving line drum and the driven line drum, and calculating the length of the linear object to be measured.
Description
Technical Field
The invention belongs to the field of measurement, and particularly relates to a device and a method for measuring the length of a linear object.
Background
At present, most enterprises generally adopt tools such as tape measures or meter rulers to measure the length of linear objects such as optical cables, network cables and the like, manual measurement is needed, the influence of human factors is large, measurement errors are increased, the tape measures produced in various factories are different in errors, and the measurement accuracy is not high; for the object of the reel of the cable, if a high-precision laser distance measuring instrument is adopted, the length value can be measured only by straightening the cable, the operation is complex, and the efficiency is low. Therefore, there is a need for a new measuring method, which can accurately measure the length of the linear object and is simple and convenient to operate.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a device for measuring the length of a linear object and a measuring method thereof, wherein the Doppler effect is utilized, and the speed is measured due to the phenomenon that the frequency of waves received by an observer is changed when a wave source or the observer moves relative to a medium; a monochromatic laser is utilized to irradiate the surface of a moving object, the frequency shift of reflected light relative to incident light, namely the Doppler frequency shift, is measured, and the speed of the object can be further determined; the time used is measured by a timer, and the length of the object is calculated as speed multiplied by time.
The device for measuring the length of the linear object comprises a wire feeding device, wherein the wire feeding device comprises a driving wire barrel and a driven wire barrel, the linear object to be measured is wound on the driven wire barrel, one end of the linear object to be measured is fixedly arranged on the driving wire barrel, the driving wire barrel rotates to drive the driven wire barrel, and the linear object to be measured wound on the driven wire barrel is conveyed to the driving wire barrel.
And the optical measuring device is arranged between the driving bobbin and the driven bobbin and is used for emitting a light beam on the surface of the moving linear object to be measured, acquiring the running speed of the linear object to be measured in the running stroke and calculating the length of the running stroke of the linear object to be measured according to the running speed and the running time. Summing the length of the running stroke of the linear object to be measured and the distance between the driving bobbin and the driven bobbin, and calculating to obtain the length of the linear object to be measured.
In order to better realize the invention, the wire feeding device also comprises a first stabilizing wire barrel and a second stabilizing wire barrel; the central axis of the driving bobbin, the central axis of the driven bobbin, the central axis of the first stabilizing bobbin and the central axis of the second stabilizing bobbin are all located on the same plane, and the first stabilizing bobbin and the second stabilizing bobbin are arranged between the driving bobbin and the driven bobbin.
In order to better realize the invention, the structure of the first stabilizing bobbin is the same as that of the second stabilizing bobbin.
In order to better realize the invention, the driving bobbin is connected with a motor, the motor drives the driving bobbin to rotate, and one end of the linear object to be detected is fixedly arranged on the driving bobbin after passing through the first stabilizing bobbin and the second stabilizing bobbin in sequence.
In order to better realize the invention, annular grooves are formed in the middles of the peripheries of the first stabilizing bobbin and the second stabilizing bobbin, and one end of the linear object is fixedly arranged on the driving bobbin after passing through the annular groove of the first stabilizing bobbin and the annular groove of the second stabilizing bobbin in sequence. The annular grooves are formed in the middles of the peripheries of the first stabilizing wire barrel and the second stabilizing wire barrel, so that the measuring error caused by swinging of a linear object to be measured in the operation process can be avoided during measurement.
In order to better realize the invention, the optical measuring device comprises a laser, a beam splitter, a reflector, a first lens, a second lens, a photoelectric tube and a signal processing device, wherein the laser emits a laser beam to irradiate on a running linear object, the beam splitter is arranged on a path of the laser beam irradiating on the running linear object, and the beam splitter splits the laser beam into a first beam and a second beam; the reflector is used for adjusting the direction of the second light beam, so that two light beams can be irradiated on the head and neck; the first lens is arranged on the paths of the first light beam and the second light beam; the first light beam and the second light beam are converged by the first lens and then reach a running linear object, scattered light beams reflected by the linear object are irradiated on the photoelectric tube through the second lens, and the signal processing device is connected with the photoelectric tube.
In order to better implement the invention, the distance between the laser and the running linear object is less than or equal to 5 m. The laser can be installed at any position, but the distance between the laser and the running linear object is less than or equal to 5m in order to avoid too weak light beam irradiated on the surface of the running linear object.
In order to better implement the present invention, a measuring method using the apparatus for measuring a length of a linear object described above includes the steps of:
the laser emits laser beams at the moment of starting the motor, and a timer is used for timing; the laser beam emitted by the laser is monochromatic light. The included angle between the first light beam and the linear object to be detected is theta1The included angle between the second light beam and the linear object to be measured is theta2The angle between the scattered light beam after reflection and the linear object is theta3；
The frequency shift of the scattered light beam and the first light beam is as follows:
the frequency shift of the scattered light beam and the second light beam is as follows:
the frequency difference between the first light beam and the second light beam is as follows:
in the above formula f0the frequency of incident light, c is the speed of light, v is the running speed of the linear object, and α is the included angle between the first light beam and the second light beam;
according to the formula, the frequency difference between the first light beam and the second light beam and the included angle theta between the reflected scattered light beam and the linear object can be known3Therefore, the optical measuring device can be used for measuring in any direction without being limited by field conditions, and the lens is used, so that the scattered light energy of the particles is greatly utilized, and the signal-to-noise ratio is improved.
The signal processing device passes throughFormula (II)
Calculating to obtain the speed v of the linear object to be measured, obtaining the functional relation between v and the running time t of the linear object to be measured, and obtaining the length of the running stroke of the linear object to be measured in the time t
The length of the linear object to be measured is:
in the formula d0Is the distance between the central axis of the main bobbin and the central axis of the driven bobbin.
By adopting the technical scheme provided by the invention, the length of the object is indirectly measured by using the Doppler effect and using the wavelength of light as a reference and measuring the movement speed and time of the object; the method adopts non-contact measurement, has novel and simple operation mode, strong anti-interference capability and high measurement precision, is not influenced by external factors such as temperature and the like, and obviously improves the measurement efficiency.
Drawings
FIG. 1 is a schematic structural view of an apparatus for measuring a length of a linear object according to an embodiment;
FIG. 2 is a schematic structural diagram of a first stabilizing bobbin in the embodiment;
FIG. 3 is a schematic diagram of the measurement of the optical measuring device in the embodiment;
10-a wire feeding device; 20-an optical measuring device; 101-an active bobbin; 102-a driven bobbin; 103-stabilizing bobbin one; 104-stabilizing bobbin II; 1031-ring groove; 201-a laser; 202-a beam splitter; 203-reflector, 204-lens one; 205-lens two; 206-a photocell; 207-signal processing means.
Detailed Description
To facilitate an understanding of the invention, the invention is described more fully hereinafter with reference to the accompanying drawings, in which specific embodiments are shown. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The present embodiment describes the structure of the device for measuring the length of a linear object and the measuring method thereof in detail by taking a measuring cable as an example.
A device for measuring the length of a linear object is shown in figure 1 and comprises a wire feeding device 10 and an optical measuring device 20, wherein the wire feeding device 10 comprises a driving wire barrel 101, a driven wire barrel 102, a first stabilizing wire barrel 103 and a second stabilizing wire barrel 104, a cable to be measured is wound on the driven wire barrel 102, one end of the cable is fixedly arranged on the driving wire barrel 101, the driving wire barrel 101 rotates to drive the driven wire barrel 102, and the cable to be measured wound on the driven wire barrel 102 is conveyed to the driving wire barrel 101.
The central axis of the driving bobbin 101, the central axis of the driven bobbin 102, the central axis of the first stabilizing bobbin 103 and the central axis of the second stabilizing bobbin 104 are all located on the same plane, the first stabilizing bobbin 103 and the second stabilizing bobbin 104 are arranged between the driving bobbin 101 and the driven bobbin 102, an annular groove 1021 is formed in the middle of the periphery of the first stabilizing bobbin 103, and the first stabilizing bobbin 103 and the second stabilizing bobbin 104 are identical in structure; the driving bobbin 101 is connected with a motor, the motor drives the driving bobbin 101 to rotate, and one end of the cable is fixedly arranged on the driving bobbin 101 after passing through the annular groove 1021 of the first stabilizing bobbin 103 and the annular groove 1021 of the second stabilizing bobbin 104 in sequence, as shown in fig. 2. An annular groove 1021 is formed in the middle of the periphery of the first stabilizing bobbin 103, so that measurement errors caused by swinging in the process of cable running can be avoided during measurement.
In actual production, the manufactured cable is wound on a cable drum, namely, the cable is wound on the driven wire barrel 102, in order to avoid measurement errors caused by cable swinging during measurement, a first stabilizing wire barrel 103 and a second stabilizing wire barrel 104 are designed, annular grooves 1021 are formed in the middles of the peripheries of the first stabilizing wire barrel 103 and the second stabilizing wire barrel 104, and the width of each annular groove 1021 is the same as the diameter of the cable.
Referring to fig. 3, the optical measuring device 20 is disposed between the driving bobbin 101 and the driven bobbin 102 for emitting light beams on the moving cable surface, determining the running speed of the cable, and calculating the length of the cable according to the running speed and the running time.
The optical measuring device 20 comprises a laser 201, a beam splitter 202, a reflector 203, a first lens 204, a second lens 205, a photoelectric tube 206 and a signal processing device 207, wherein the laser 201 emits a laser beam to irradiate on a running cable, the laser 201 can be installed at any position, but the laser beam emitted by the laser 201 can be ensured to irradiate on the running cable, and in order to avoid the light beam irradiating on the surface of a running object to be too weak, the distance between the laser 201 and the running cable is less than or equal to 5 m.
The beam splitter 202 is arranged on a path of the laser beam irradiated on the running cable, and the beam splitter 202 splits the laser beam into a first beam and a second beam; the reflector 203 is used for adjusting the direction of the second light beam, so that two light beams can be irradiated on the head and neck; the first lens 204 is arranged on the path of the first light beam and the second light beam; the first light beam and the second light beam converge through the first lens 204 and reach a running cable, the scattered light beam reflected through the cable irradiates on the photoelectric tube 206 through the second lens 205, and the signal processing device 207 is connected with the photoelectric tube 206.
The following describes in detail the measuring method using the above device for measuring the length of a cable, which measures the length of the cable in a backscattering difference mode, fixes one end of the cable wound on the driven bobbin 102 on the driving bobbin 101, starts a motor, the motor drives the driving bobbin 101 to rotate, starts timing by using a timer, and the cable moves at a speed v; the motor is started instantly, the laser 201 emits laser beams, the laser beams emitted by the laser 201 are monochromatic light, the laser beams are divided into a first light beam and a second light beam through the light splitter 202, the first light beam and the second light beam are converged through the lens and then irradiate the surfaces of the cables, and the included angle between the first light beam and the cables is theta1The included angle between the second light beam and the cable is theta2The angle between the scattered light beam after reflection and the cable is theta3；
The frequency shifts of the reflected scattered light and the first and second light beams are respectively as follows:
the frequency difference between the first light beam and the second light beam is:
in the above formula f0for the frequency of the incident light, c is the speed of light, v is the speed of the cable, and α is the angle between the first and second beams (along the direction of the cable speed).
According to the formula, the frequency difference between the first light beam and the second light beam and the included angle theta between the scattered light beam after reflection and the cable can be known3Regardless of this, the optical measuring device 20 can be used to measure in any direction without being limited by field conditions, and the lens is used to greatly utilize the energy of the scattered light of the particles, thereby improving the signal-to-noise ratio.
The scattered light beams reflected by the cable irradiate on the photoelectric tube 206 through the second lens 205, the signal processing device 207 is connected with the photoelectric tube 206, the photoelectric tube 206 converts received optical signals into electric signals, the signal processing device 207 receives the electric signals output by the photoelectric tube 206 and converts the electric signals into speed signals, and the length of the cable is obtained through integration; the signal processing device 207 passes the formula
Calculating to obtain the speed v of the cable, obtaining the functional relation between v and the cable running time t, and obtaining the length of the cable in the time t
The distance between the central axis of the master spool and the central axis of the slave spool 102 is d0The calculation formula of the length of the cable is as follows:
this allows the length of the cable to be calculated.
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 invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. An apparatus for measuring the length of a linear object, comprising:
the wire feeding device comprises a driving wire barrel and a driven wire barrel, wherein a linear object to be detected is wound on the driven wire barrel, one end of the linear object to be detected is fixedly arranged on the driving wire barrel, the driving wire barrel rotates to drive the driven wire barrel, and the linear object to be detected wound on the driven wire barrel is conveyed to the driving wire barrel;
the optical measurement device is arranged between the driving line drum and the driven line drum and used for emitting a light beam on the surface of the moving linear object to be measured to obtain the running speed of the linear object to be measured in the running stroke, calculating the running stroke length of the linear object to be measured according to the running speed and the running time, summing the running stroke length of the linear object to be measured and the distance between the driving line drum and the driven line drum, and calculating the length of the linear object to be measured.
2. The apparatus for measuring the length of a linear object according to claim 1, wherein the wire feeding means further comprises a first stabilizing wire bobbin, a second stabilizing wire bobbin; the central axis of the driving bobbin, the central axis of the driven bobbin, the central axis of the first stabilizing bobbin and the central axis of the second stabilizing bobbin are all located on the same plane, and the first stabilizing bobbin and the second stabilizing bobbin are arranged between the driving bobbin and the driven bobbin.
3. The device for measuring the length of the linear object according to claim 2, wherein annular grooves are formed in the middles of the peripheries of the first stabilizing bobbin and the second stabilizing bobbin, and one end of the linear object is fixedly arranged on the driving bobbin after passing through the annular groove of the first stabilizing bobbin and the annular groove of the second stabilizing bobbin in sequence.
4. The apparatus for measuring the length of a linear object according to any of claims 1 to 3, wherein the optical measuring device comprises a laser, a beam splitter, a first lens, a second lens, a photoelectric tube, and a signal processing device, the laser emits a laser beam to irradiate on the running linear object, the beam splitter is arranged on the path of the laser beam irradiating on the running linear object, and the beam splitter splits the laser beam into a first beam and a second beam; the first lens is arranged on the paths of the first light beam and the second light beam; the first light beam and the second light beam are converged by the first lens and then reach a running linear object, scattered light beams reflected by the linear object are irradiated on the photoelectric tube through the second lens, and the signal processing device is connected with the photoelectric tube.
5. An apparatus for measuring the length of a line object according to claim 4, wherein the distance of the laser from the running line object is less than or equal to 5 m.
6. The apparatus according to claim 4, wherein the first light beam is at an angle θ to the linear object to be measured1The included angle between the second light beam and the linear object to be measuredIs theta2The angle between the scattered light beam after reflection and the linear object is theta3；
The frequency shift of the scattered light beam and the first light beam is as follows:
the frequency shift of the scattered light beam and the second light beam is as follows:
the frequency difference between the first light beam and the second light beam is as follows:
in the above formula f0the frequency of incident light, c is the speed of light, v is the running speed of the linear object, and α is the included angle between the first light beam and the second light beam;
the signal processing device passes through a formula
Calculating to obtain the speed v of the linear object to be measured, obtaining the functional relation between v and the running time t of the linear object to be measured, and obtaining the length of the running stroke of the linear object to be measured in the time t
The length of the linear object to be measured is:
in the formula d0Is the distance between the central axis of the main bobbin and the central axis of the driven bobbin.
7. The method of claim 6, wherein the laser beam is a monochromatic light.
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| CN202010436232.7A CN111735398A (en) | 2020-05-22 | 2020-05-22 | Device for measuring length of linear object |
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| CN202010436232.7A CN111735398A (en) | 2020-05-22 | 2020-05-22 | Device for measuring length of linear object |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03238353A (en) * | 1990-02-16 | 1991-10-24 | Canon Inc | Laser doppler speedometer |
| CN1595171A (en) * | 2003-09-13 | 2005-03-16 | 绍勒有限责任两合公司 | Method and device for contactless determination of the speed of a running thread of yarn |
| CN201415894Y (en) * | 2009-07-20 | 2010-03-03 | 惠州住成电装有限公司 | Wire feeding device of wire stock processing equipment |
| CN207832131U (en) * | 2018-01-17 | 2018-09-07 | 青岛大学 | Braiding yarn speed based on line-scan digital camera and measurement of length system |
| CN110554402A (en) * | 2018-05-31 | 2019-12-10 | 佳能株式会社 | Measuring device and processing device |
| CN210036605U (en) * | 2019-04-18 | 2020-02-07 | 东莞市概迅计算机科技有限公司 | High-precision laser length measuring instrument |
-
2020
- 2020-05-22 CN CN202010436232.7A patent/CN111735398A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03238353A (en) * | 1990-02-16 | 1991-10-24 | Canon Inc | Laser doppler speedometer |
| CN1595171A (en) * | 2003-09-13 | 2005-03-16 | 绍勒有限责任两合公司 | Method and device for contactless determination of the speed of a running thread of yarn |
| CN201415894Y (en) * | 2009-07-20 | 2010-03-03 | 惠州住成电装有限公司 | Wire feeding device of wire stock processing equipment |
| CN207832131U (en) * | 2018-01-17 | 2018-09-07 | 青岛大学 | Braiding yarn speed based on line-scan digital camera and measurement of length system |
| CN110554402A (en) * | 2018-05-31 | 2019-12-10 | 佳能株式会社 | Measuring device and processing device |
| CN210036605U (en) * | 2019-04-18 | 2020-02-07 | 东莞市概迅计算机科技有限公司 | High-precision laser length measuring instrument |
Non-Patent Citations (1)
| Title |
|---|
| 吴杰 等: "《医学电子学基础与医学影像物理学》", 30 March 2014 * |
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Application publication date: 20201002 |