CN207515745U - A kind of electromagnetism modulated polarized light great-scale displacement sensor - Google Patents
A kind of electromagnetism modulated polarized light great-scale displacement sensor Download PDFInfo
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- CN207515745U CN207515745U CN201721726325.3U CN201721726325U CN207515745U CN 207515745 U CN207515745 U CN 207515745U CN 201721726325 U CN201721726325 U CN 201721726325U CN 207515745 U CN207515745 U CN 207515745U
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- displacement sensor
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Abstract
The utility model is a kind of electromagnetism modulated polarized light great-scale displacement sensor, belongs to detection device field, can not have both the accurately detection and the problem of reasonable price of wide range absolute position for existing equipment, adopt the following technical scheme that：A kind of electromagnetism modulated polarized light great-scale displacement sensor, including polarised light generation system, polarized light detection examining system and magneto-optic modulation system, the polarised light generation system includes light emitting diode, and the polarizer, polarized light detection examining system includes analyzer and photoelectric tube, the analyzer light transmission shaft and polarizer light transmission shaft arrangement into θ angle；The magneto-optic modulation system makes the light rotation θ ' angles through the polarizer, and including the air core solenoid to alive, the electric current in air core solenoid is waveform-shaped current, as θ+θ '=0, obtains through the current value of air core solenoid and corresponding time at this time.The price of parts is comparatively relatively low, reasonable price；Record current and time, therefore higher accuracy of detection can be obtained.
Description
Technical field
The utility model belongs to photoelectric field, more particularly to a kind of electromagnetism modulated polarized light great-scale displacement sensor.
Background technology
1809, Malus was found that the method for obtaining and examining polarised light, and hereafter people are continuously attempted to various physics
Amount is associated with polarized light detection examining system, in the hope of realizing the measurement of itself of these physical quantitys.It is measured with polarized light detection principle
Various physics quantifier eliminations appear in the newspapers repeatly, electricity physical quantity successively occur（Electric current, magnetic field）Polarized light sensor, mechanical-physical amount
（Stress, torque, vibration angular displacement）It measures and the results of study such as polarized light sensor is applied in optical measurement and use polarization
Light carries out straight-line displacement measurement.
Displacement measurement（Including liquid level gauging）It is one of measuring technique most basic in measuring technique.In actual industrial field
In scientific experimentation, straight-line displacement is to encounter most one kind to be measured, therefore the development of various principle linear displacement transducers
It is paid more and more attention.Particularly research of the wide range linear displacement transducer in China is still in infancy, sensors with auxiliary electrode
Demand and product supply it is relatively small.With industrial development, the demand of sensors with auxiliary electrode greatly increases.Typical field of application
Such as fuselage dead weight test system, auto-guider, the test of automotive suspension system, large size plastic jetting-moulding device, electric lift and printing machine
Tool etc..
Straight-line displacement or angular displacement are a basic physical quantitys, and displacement sensor is measured in scientific research and commercial Application
It is big and wide.Various principles（Straight line）The type of displacement sensor is more, and most widely used at present surely belongs to potentiometric displacement
Sensor and inductance（Or differential transformer）Formula displacement sensor（The occupation rate of market of the two is more than 80%）.Existing current potential
Device formula displacement sensor, it is simple in structure, it is cheap, but it belongs to typical touch sensor, thus its is easy to wear, it can
Relatively low, the restricted lifetime by property is not suitable for the measurement of continuous operation occasion.Existing inductance（Or differential transformer）Formula displacement sensing
The typical index of device is：Precision 0.5~0.1%；Range is up to 500mm；The linearity 0.5~0.2%.Although inductance（Or differential change
Depressor）Formula displacement sensor be noncontacting proximity sensor, have the advantages that it is stable, reliable, but with measurement range increasing
Add, it is necessary to increase the length of its bobbin, and the uniform coiling of coil, this can cause inductance（Or differential transformer）Formula displacement sensing
The range that device measures is limited（The hundreds of millimeters of orders of magnitude）；In addition the circuit used in it is relative complex, makes its price also higher, uses
It is limited in scope.
In the occasion for requiring high-resolution and high accuracy, often using photoelectric encoder（Or grating sensor）.Light
Photoelectric coder（Or grating sensor）The advantages of be when realizing wide range absolute position detection, accuracy in detection is high, can be real
Existing digital measurement；Shortcoming is that manufacturing process is complicated, expensive.Therefore it is urgent to provide one kind to have both inductance（Or differential transformer）
Formula displacement sensor and photoelectric encoder（Or grating sensor）The sensors of large measurement range of advantage.
Utility model content
The problem of can not having both the accurate detection in wide range absolute position and reasonable price for existing equipment, the utility model
A kind of electromagnetism modulated polarized light great-scale displacement sensor, accuracy of detection height and reasonable price are provided.
For this purpose, the technical solution of the utility model is as follows：A kind of electromagnetism modulated polarized light great-scale displacement sensor, including
Polarised light generation system, polarized light detection examining system and the magneto-optic between polarised light generation system and polarized light detection examining system
Modulating system, the polarised light generation system include being used cooperatively as the light emitting diode of light source and with light emitting diode
The polarizer, polarized light detection examining system includes analyzer and the photoelectric tube for receiving analyzer optical signal, and the analyzer is saturating
Optical axis and polarizer light transmission shaft arrangement into θ angle；The magneto-optic modulation system makes the light rotation θ ' angles through the polarizer, including logical
There are the air core solenoid of electric current and the Faraday Magneto-optical Glass Containing in air core solenoid, be connected in the air core solenoid
Electric current is waveform-shaped current, and the value at θ ' angles is in variation, as θ+θ '=0, obtain by the current value of air core solenoid and this
When the corresponding time.
Polarized-light linear displacement sensor has the structure similar to existing potentiometric displacement transducer, and its transducing part
For non-contacting Systems for optical inspection, because without potentiometer pick-off is easy to wear, reliability is relatively low, restricted lifetime the shortcomings that；
And comparatively the price of parts used is relatively low, at least than grating sensor order of magnitude lower, therefore reasonable price；
Changed by the angle rule of tested angle variation and magneto-optic modulation and be measured caused angle change to offset, record measures magnetic
Electric current and time when light modulation angle is offset with tested angle variation, complete conversion of the mechanical displacement to magneto-optic modulation electric current,
It is not the size of direct measurement angle, therefore higher accuracy of detection can be obtained.
The principle of the utility model is：Measured straight-line displacement X is passed through into mechanical structure first（Linearly）It is converted to
Angular displacement, the angle theta angle of the polarizer and analyzer light transmission between centers are corresponded with angular displacement, and according to Malus' law, θ is with penetrating
The light intensity J of analyzer 1Between there is determining relationship, i.e.,：
J1 = J0COS2θ （1）
The air core solenoid of energization makes the light rotation θ ' angles through the polarizer, according to Faraday magnetooptical effect：
θ′=ρBL （2）
ρ is the Verdet constants of rotation glass；L is optically-active medium length；B is acts on optically-active medium along optical propagation direction
Magnetic field intensity.
As the coil current I of air core solenoid（I is directly proportional to B）Variation so that meet：
θ+θ′=0 （3）
At this moment, the Relationship of Light intensity becomes：
J1 = J0COS2 （θ+θ′）=J0（4）
When angle is offset, system output intensity obtains maximum value J0, the corresponding time at this time is recorded, since electric current is waveform
There are determining correspondence in electric current, time with current value, and the acquisition time can obtain current value I, and then obtain input angle θ,
And angle, θ and displacement positive correlation, therefore the straight-line displacement that can be inputted indirectly.
Further, the electric current is the modulation electric current with triangle wave period, and current value is corresponded with the time.Due to
Accurate modulation electric current simultaneously maintains to have difficulties, thus using the electric current of mechanical periodicity, record meets formula（4）Time can obtain
Corresponding current value at this time is obtained, according to formula（2）Corresponding θ ' angles can be obtained, according to formula（3）θ values can be obtained, and then are obtained
Mechanical displacement X.
Further, signal is transported to a signal processing and control device, the signal processing and control by the photoelectric tube
Device processed is used to collect and handle the photosignal sent out from photoelectric tube.When the light intensity that photoelectric tube projects reaches maximum value, quilt
Signal processing is received and is recorded with control device.
Further, the light emitting diode is co-axially mounted with the polarizer.This to ensure that the light intensity of polarised light inclined
The consistency shaken on direction.
Further, analyzer is limited in a plane for fixing the analyzer stent of analyzer, for fixing
The polarizer stent of inclined device limits the polarizer in another plane, and plane is parallel with plane where the polarizer where analyzer.
The distance of two interplanars being mutually parallel is equal, thus fall analyzer light planar be balanced.
Further, plane where the polarizer and planar coaxial where analyzer.It ensure that be finally collected into
The waveform that optical signal generates does not shift.
The utility model has the advantage that：Comparatively the price of parts used is relatively low, at least compare grating
Sensor order of magnitude lower, therefore reasonable price；Change to support by the angle rule of tested angle variation and magneto-optic modulation
Disappear angle change caused by being measured, and record measures the electric current and time when magneto-optic modulation angle is offset with tested angle variation,
Mechanical displacement is completed to the conversion of magneto-optic modulation electric current, is not the size of direct measurement angle, therefore higher inspection can be obtained
Survey precision.
Description of the drawings
Fig. 1 is the structure diagram of the utility model；
Fig. 2 is the principle schematic of the utility model；
In figure, 1- light emitting diodes；The 2- polarizers；3- polarizer stents；4- Faraday Magneto-optical Glass Containings；The hollow helicals of 5-
Pipe；6- analyzers；7- analyzer stents；8- photoelectric tubes；9- signal processings and control device；10- modulation power sources.
Specific embodiment
With reference to the attached drawing of the utility model, the technical solution of the utility model embodiment is explained and illustrated,
But following embodiments are only the preferred embodiment of the utility model, and not all.Based on the embodiment in embodiment, this field
Technical staff obtains other embodiment under the premise of creative work is not made, and belongs to the protection model of the utility model
It encloses.
A kind of electromagnetism modulated polarized light great-scale displacement sensor, as depicted in figs. 1 and 2, including polarised light generation system,
Polarized light detection examining system and the magneto-optic modulation system between polarised light generation system and polarized light detection examining system, it is described inclined
Light generation system of shaking includes the light emitting diode 1 as light source and the polarizer 2 being used cooperatively with light emitting diode 1, polarization
Optical detection system includes analyzer 6 and the photoelectric tube 8 for receiving 6 optical signal of analyzer, and 6 light transmission shaft of analyzer is with being polarized
2 light transmission shaft of device arrangement into θ angle；The magneto-optic modulation system makes the light rotation θ ' angles through the polarizer 2, including what is alived
Air core solenoid 5 and the Faraday Magneto-optical Glass Containing 4 in air core solenoid 5, the electric current being connected in the air core solenoid 5
For waveform-shaped current, the value at θ ' angles is in variation, as θ+θ '=0, is obtained through the current value of air core solenoid 5 and at this time
The corresponding time.
Polarized-light linear displacement sensor has the structure similar to existing potentiometric displacement transducer, and its transducing part
For non-contacting Systems for optical inspection, because without potentiometer pick-off is easy to wear, reliability is relatively low, restricted lifetime the shortcomings that；
And comparatively the price of parts used is relatively low, at least than grating sensor order of magnitude lower, therefore reasonable price；
Changed by the angle rule of tested angle variation and magneto-optic modulation and be measured caused angle change to offset, record measures magnetic
Electric current and time when light modulation angle is offset with tested angle variation, complete conversion of the mechanical displacement to magneto-optic modulation electric current,
It is not the size of direct measurement angle, therefore higher accuracy of detection can be obtained.
The electric current is the modulation electric current with triangle wave period, and current value is corresponded with the time.Due to accurately modulating
Electric current simultaneously maintains to have difficulties, thus using the electric current of mechanical periodicity, the electric current of mechanical periodicity is exported by modulation power source 10.
Signal is transported to a signal processing and control device 9, the signal processing and control device 9 by the photoelectric tube 8
For collecting and handling the photosignal sent out from photoelectric tube 8.When the light intensity that photoelectric tube 8 projects reaches maximum value, by signal
Processing is received and is recorded with control device 9.
The light emitting diode 1 is co-axially mounted with the polarizer 2.This to ensure that the light intensity of polarised light in polarization direction
Consistency.
Analyzer stent 7 for fixing analyzer 6 limits analyzer 6 in a plane, for fixing the polarizer 2
Polarizer stent 3 limits the polarizer 2 in another plane, and 6 place plane of analyzer is parallel with 2 place plane of the polarizer.Phase
Mutually the distance of parallel two interplanars is equal, thus fall analyzer 6 light planar be balanced.
The 2 place plane of the polarizer and 6 place planar coaxial of analyzer.It ensure that the optical signal production being finally collected into
Raw waveform does not shift.
The above, only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to
In this, one skilled in the art should be understood that the utility model includes but not limited to attached drawing and above specific embodiment
Described in content.The modification of any function and structure principle without departing from the utility model is intended to be included in the model of claim
In enclosing.
Claims (6)
1. a kind of electromagnetism modulated polarized light great-scale displacement sensor, including polarised light generation system, polarized light detection examining system with
And the magneto-optic modulation system between polarised light generation system and polarized light detection examining system, which is characterized in that the polarised light
Generation system includes the light emitting diode as light source（1）And and light emitting diode（1）The polarizer being used cooperatively（2）, partially
The optical detection system that shakes includes analyzer（6）With for receiving analyzer（6）The photoelectric tube of optical signal（8）, the analyzer（6）Thoroughly
Optical axis and the polarizer（2）Light transmission shaft arrangement into θ angle；The magneto-optic modulation system makes through the polarizer（2）Light rotation θ ' angles,
Including the air core solenoid to alive（5）And mounted in air core solenoid（5）Interior Faraday Magneto-optical Glass Containing（4）；The sky
Heart solenoid（5）In the electric current that is connected be waveform-shaped current, the value at θ ' angles is in variation, as θ+θ '=0, is obtained by hollow
Solenoid（5）Current value and corresponding time at this time.
2. electromagnetism modulated polarized light great-scale displacement sensor according to claim 1, which is characterized in that the electric current is
Modulation electric current with triangle wave period, current value are corresponded with the time.
3. electromagnetism modulated polarized light great-scale displacement sensor according to claim 1, which is characterized in that the photoelectric tube
（8）Signal is transported to a signal processing and control device（9）, the signal processing and control device（9）For collecting and locating
It manages from photoelectric tube（8）The photosignal sent out.
4. electromagnetism modulated polarized light great-scale displacement sensor according to claim 1, which is characterized in that described luminous two
Pole pipe（1）With the polarizer（2）It is co-axially mounted.
5. electromagnetism modulated polarized light great-scale displacement sensor according to claim 4, which is characterized in that examined for fixed
Inclined device（6）Analyzer stent（7）By analyzer（6）Limiting is in a plane, for fixing the polarizer（2）Polarizer stent
（3）By the polarizer（2）Limiting is in another plane, analyzer（6）Place plane and the polarizer（2）Place plane is parallel.
6. electromagnetism modulated polarized light great-scale displacement sensor according to claim 5, which is characterized in that the polarizer
（2）Place plane and analyzer（6）Place planar coaxial.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721726325.3U CN207515745U (en) | 2017-12-12 | 2017-12-12 | A kind of electromagnetism modulated polarized light great-scale displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721726325.3U CN207515745U (en) | 2017-12-12 | 2017-12-12 | A kind of electromagnetism modulated polarized light great-scale displacement sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207515745U true CN207515745U (en) | 2018-06-19 |
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ID=62544243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721726325.3U Expired - Fee Related CN207515745U (en) | 2017-12-12 | 2017-12-12 | A kind of electromagnetism modulated polarized light great-scale displacement sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207515745U (en) |
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2017
- 2017-12-12 CN CN201721726325.3U patent/CN207515745U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180619 Termination date: 20181212 |