CN102226818A - Full optics differential monitoring device based on Pockels effect - Google Patents
Full optics differential monitoring device based on Pockels effect Download PDFInfo
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- CN102226818A CN102226818A CN2011100756848A CN201110075684A CN102226818A CN 102226818 A CN102226818 A CN 102226818A CN 2011100756848 A CN2011100756848 A CN 2011100756848A CN 201110075684 A CN201110075684 A CN 201110075684A CN 102226818 A CN102226818 A CN 102226818A
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Abstract
Provided is a full optics differential monitoring device based on Pockels effects. The invention relates to the field of optics control and solves the problems that light beams are severely interfered by electromagnetic in the detection process of a present detection apparatus and the accuracy is low when digital signals are used to judge the deflection angle of lights. A first polarized light beam is obtained when a first incident light beam of the monitoring device is transmitted by a first electric light crystal. The first polarized light beam is divided into a reflected light beam and a transmitted light beam through number one semitransparent mirror. The reflected light beam emits in the direction vertical to the optical axis of the first polarized light beam. A second polarized light beam is obtained when a second incident light beam of the monitoring device is transmitted by a second electric light crystal. The second polarized light beam is reflected by a number one total reflective mirror to obtain another reflected light beam which gathers at the light input terminal of a photoelectric detector with the transmitted light beam transmitted by the number one semitransparent mirror. The invention can be widely applied to the field of light control.
Description
Technical field
The present invention relates to optics control field.
Background technology
Existing detection instrument all is that light beam is through the light intensity sniffer behind the optical voltage transformer; the optical information that photoelectric commutator received in the light intensity sniffer is the optical information through changing behind the mutual induction of voltage; two photoelectric commutators use digital signal to compare the two-beam that receives; if two digital signals have difference; explanation has taken place unusually owing to voltage in the transmission of light; therefore make light beam that variation has also taken place, thereby start protective device through photoelectric commutator.The shortcoming that prior art exists is: use the cost height of two photodetectors, and in use be subjected to electromagnetic interference (EMI) strong, the error effect that occurs after light signal changes electric signal into is very big, thereby the accuracy rate of the polarization angle of two light beams that obtain is low.
Summary of the invention
The present invention is subjected to electromagnetic interference (EMI) serious for solving existing sniffer light beam in detection process, and adopts digital signal to judge the low problem of accuracy rate of the deflection angle of light, proposes the differential monitoring device of full optics based on bubble Ke Ersi effect.
The differential monitoring device of full optics based on bubble Ke Ersi effect, it comprises photodetector, it also comprises an electro-optic crystal, semi-transparent semi-reflecting lens, half-wave plate, No. two electro-optic crystals and a total reflective mirror, first incident beam obtains first light beam after the first electro-optic crystal transmission, described first light beam is incident to semi-transparent semi-reflecting lens No. one, and being divided into folded light beam and transmitted light beam through a semi-transparent semi-reflecting lens, described folded light beam is along the direction outgoing vertical with the optical axis of first light beam;
Second incident beam is incident to second electro-optic crystal after the half-wave plate transmission, after the second electro-optic crystal transmission, obtain second light beam, described second light beam is incident to total reflective mirror and obtains folded light beam through a total reflective mirror reflection, described folded light beam and the light input end that converges to photodetector through the transmitted light beam of a semi-transparent semi-reflecting lens transmission.
Whether judgement produces interference fringe on photodetector, if do not have, and electric current normal transmission then; If have, then electric current occurs unusually, thereby realizes the moving monitoring of the full equation of light.
Beneficial effect: the present invention adopts a photodetector that the deflection angle of two bundle incident beams is surveyed, and light beam is subjected to electromagnetic interference (EMI) little in detection process, judges the accuracy rate height of the deflection angle of light.
Description of drawings
Fig. 1 is a structural representation of the present invention; Fig. 2 is the structural representation of the specific embodiment of the invention two; Fig. 3 is the structural representation of the specific embodiment of the invention four.
Embodiment
Embodiment one, in conjunction with Fig. 1 this embodiment is described, the differential monitoring device of full optics based on bubble Ke Ersi effect, it comprises photodetector 6, it comprises electro-optic crystal 1 No. one, a semi-transparent semi-reflecting lens 2, half-wave plate 3, No. two electro-optic crystals 4 and a total reflective mirror 5, first incident beam obtains first light beam after 2 transmissions of first electro-optic crystal, described first light beam is incident to semi-transparent semi-reflecting lens 3 No. one, and being divided into folded light beam and transmitted light beam through a semi-transparent semi-reflecting lens 3, described folded light beam is along the direction outgoing vertical with the optical axis of first light beam;
Second incident beam is incident to second electro-optic crystal 4 after half-wave plate 3 transmissions, after 4 transmissions of second electro-optic crystal, obtain second light beam, described second light beam is incident to a total reflective mirror 5 and obtains folded light beam, described folded light beam and the light input end that converges to photodetector 5 through the transmitted light beam of semi-transparent semi-reflecting lens 3 transmissions.
Present embodiment adopts a photodetector to survey, and with respect to two methods that photodetector is surveyed of existing employing, cost is reduced significantly.
Embodiment two, this embodiment and embodiment one described difference based on the differential monitoring device of full optics that steeps the Ke Ersi effect are, it also comprises a light source 11 and No. two light sources 12, first incident beam is sent by a light source 11, and second incident beam is sent by No. two light sources 12.
Embodiment three, this embodiment and embodiment two described differences based on the differential monitoring device of full optics that steeps the Ke Ersi effect are that a light source 11 and No. two light sources 12 are the semiconductor laser that wave band is 850nm.
Embodiment four, this embodiment and embodiment one described difference based on the differential monitoring device of full optics that steeps the Ke Ersi effect are, it also comprises light source 21, No. two semi-transparent semi-reflecting lens 22 and No. two total reflective mirrors 23, the light beam that light source 21 sends is incident to semi-transparent semi-reflecting lens 22 No. two, be divided into folded light beam and transmitted light beam through No. two semi-transparent semi-reflecting lens 22, described folded light beam is incident to total reflective mirror 23 No. two, forms first incident beam after No. two total reflective mirror 23 reflections; Transmitted light beam through No. two semi-transparent semi-reflecting lens 22 transmissions forms second incident beam.
Embodiment five, this embodiment and embodiment four described differences based on the differential monitoring device of full optics that steeps the Ke Ersi effect are that described light source 21 is the semiconductor laser of 850nm for wave band.
Embodiment six, this embodiment and embodiment one described difference based on the differential monitoring device of full optics that steeps the Ke Ersi effect are, first incident beam and second incident beam are identical light beams, and described polarized light has identical frequency, intensity and polarization state.
Embodiment seven, this embodiment and embodiment one, two, three, four, five or six described differences based on the differential monitoring device of full optics that steeps the Ke Ersi effect are, first electro-optic crystal 1 and second electro-optic crystal 4 are identical, and are LN electric light sensing crystal.
Embodiment eight, this embodiment and embodiment seven described differences based on the differential monitoring device of full optics that steeps the Ke Ersi effect are that all beam Propagation processes are all carried out in polarization maintaining optical fibre.
Principle of work: the polarimetry that the two-beam that is based on bubble Ke Ersi electrooptical effect that present embodiment adopts is interfered; be used for distinguishing the difference of their polarization directions by the image intensity after interfering, thereby start protective device through the two-beam behind the optical voltage transformer.
Light transmission of the present invention is partly transmitted in polarization maintaining optical fibre, the polarization state of the polarization state of first incident beam of described system and second incident beam of system is respectively perpendicular to the direction of propagation of light, described two blocks of electro-optic crystals are applied extra electric field, make two crystal place electric field, the polarization angle of described first incident beam after through first electro-optic crystal 1 changes, described second incident beam is through half-wave plate 3 transmissions, half-wave plate 3 makes the polarization state of second incident beam change 90 °, and the polarization state of described second incident beam is parallel with the direction of propagation of light; Second incident beam parallel with the direction of propagation of light produces electrooptical effect through second electro-optic crystal, 4 backs, and promptly variation has taken place the deflection angle of second incident beam;
Whether judgement is identical through the deflection angle that first incident beam of first electro-optic crystal 1 and second incident beam through second electro-optic crystal 4 take place, if first incident beam is identical with the deflection angle of second incident beam, first incident beam of deflection angle has then taken place, and (first incident beam has the light intensity of half directly to penetrate this mirror through a semi-transparent semi-reflecting lens 2, just get its transmission function) with second incident beam that deflection angle taken place after total reflective mirror 5 reflections again through a semi-transparent semi-reflecting lens 2 (getting its reflection function), the common directive photodetector 6 of the light beam that converges after the reflection; Because the polarization state of first incident beam and second incident beam is completely orthogonal, therefore on photodetector 6, there is not the generation of interference fringe, judge this section circuit normal transmission;
If first incident beam is different with the deflection angle of second incident beam, illustrate that then transmission line of electricity breaks down, the external voltage that second electro-optic crystal 4 of the second incident beam process is applied will change; Electric field in described second electro-optic crystal 4 also will change; according to bubble Ke Ersi effect; after first incident beam and second incident beam converge to photodetector 6; because the polarization state of two-beam is not a quadrature; so two-beam will interfere; produce interference fringe, the interference situation of the striped of surveying by photodetector 6 power transmission line as can be known occurs unusually, and then starts protective device.
Claims (8)
1. based on the differential monitoring device of full optics that steeps the Ke Ersi effect, it comprises photodetector (6), it is characterized in that: further comprising an electro-optic crystal (1), a semi-transparent semi-reflecting lens (2), half-wave plate (3), No. two electro-optic crystals (4) and a total reflective mirror (5), first incident beam obtains first light beam after first electro-optic crystal (2) transmission, described first light beam is incident to a semi-transparent semi-reflecting lens (3), and being divided into folded light beam and transmitted light beam through a semi-transparent semi-reflecting lens (3), described folded light beam is along the direction outgoing vertical with the optical axis of first light beam;
Second incident beam is incident to second electro-optic crystal (4) after half-wave plate (3) transmission, after second electro-optic crystal (4) transmission, obtain second light beam, described second light beam is incident to a total reflective mirror (5) and obtains folded light beam through a total reflective mirror (5) reflection, described folded light beam and the light input end that converges to photodetector (6) through the transmitted light beam of a semi-transparent semi-reflecting lens (3) transmission.
2. the differential monitoring device of full optics based on bubble Ke Ersi effect according to claim 1, it is characterized in that it also comprises a light source (11) and No. two light sources (12), first incident beam is sent by a light source (11), and second incident beam is sent by No. two light sources (12).
3. the differential monitoring device of full optics based on bubble Ke Ersi effect according to claim 2 is characterized in that a light source (11) and No. two light sources (12) are the semiconductor laser that wave band is 850nm.
4. the differential monitoring device of full optics based on bubble Ke Ersi effect according to claim 1, it is characterized in that it also comprises light source (21), No. two semi-transparent semi-reflecting lens (22) and No. two total reflective mirrors (23), the light beam that light source (21) sends is incident to No. two semi-transparent semi-reflecting lens (22), be divided into folded light beam and transmitted light beam through No. two semi-transparent semi-reflecting lens (22), described folded light beam is incident to No. two total reflective mirrors (23), forms first incident beam after No. two total reflective mirrors (23) reflection; Transmitted light beam through No. two semi-transparent semi-reflecting lens (22) transmission forms second incident beam.
5. the differential monitoring device of full optics based on bubble Ke Ersi effect according to claim 4 is characterized in that light source (21) is the semiconductor laser of 850nm for wave band.
6. the differential monitoring device of full optics based on bubble Ke Ersi effect according to claim 1 is characterized in that first incident beam and second incident beam are identical light beams.
7. according to claim 1,2,3,4, the 5 or 6 described differential monitoring devices of full optics, it is characterized in that first electro-optic crystal (1) and second electro-optic crystal (4) are identical, and be electric light sensing crystal based on bubble Ke Ersi effect.
8. the differential monitoring device of full optics based on bubble Ke Ersi effect according to claim 7 is characterized in that all beam Propagation processes all carry out in polarization maintaining optical fibre.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011100756848A CN102226818A (en) | 2011-03-28 | 2011-03-28 | Full optics differential monitoring device based on Pockels effect |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100756848A CN102226818A (en) | 2011-03-28 | 2011-03-28 | Full optics differential monitoring device based on Pockels effect |
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| CN102226818A true CN102226818A (en) | 2011-10-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156210A (en) * | 2011-03-28 | 2011-08-17 | 哈尔滨工业大学 | All-fiber difference stream monitoring device based on ferromagnetic concentrator ring structure |
| CN109521248A (en) * | 2018-12-11 | 2019-03-26 | 龙岩学院 | The voltage measurement method realized based on S wave plate |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769950A (en) * | 2009-12-30 | 2010-07-07 | 哈尔滨工业大学 | Full-optical fiber difference stream measuring device based on faraday effect |
| CN101793916A (en) * | 2010-03-31 | 2010-08-04 | 哈尔滨工业大学 | All-fiber current monitoring device based on Faraday effect |
| CN101975882A (en) * | 2010-09-16 | 2011-02-16 | 哈尔滨工业大学 | Difference-stream detecting method based on BSO (Bi12SiO20) crystal and device for realizing same |
-
2011
- 2011-03-28 CN CN2011100756848A patent/CN102226818A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769950A (en) * | 2009-12-30 | 2010-07-07 | 哈尔滨工业大学 | Full-optical fiber difference stream measuring device based on faraday effect |
| CN101793916A (en) * | 2010-03-31 | 2010-08-04 | 哈尔滨工业大学 | All-fiber current monitoring device based on Faraday effect |
| CN101975882A (en) * | 2010-09-16 | 2011-02-16 | 哈尔滨工业大学 | Difference-stream detecting method based on BSO (Bi12SiO20) crystal and device for realizing same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156210A (en) * | 2011-03-28 | 2011-08-17 | 哈尔滨工业大学 | All-fiber difference stream monitoring device based on ferromagnetic concentrator ring structure |
| CN109521248A (en) * | 2018-12-11 | 2019-03-26 | 龙岩学院 | The voltage measurement method realized based on S wave plate |
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Application publication date: 20111026 |