CN102359865B - Testing method of magnetic-optic effect of linear polarized light and device thereof - Google Patents
Testing method of magnetic-optic effect of linear polarized light and device thereof Download PDFInfo
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- CN102359865B CN102359865B CN 201110235971 CN201110235971A CN102359865B CN 102359865 B CN102359865 B CN 102359865B CN 201110235971 CN201110235971 CN 201110235971 CN 201110235971 A CN201110235971 A CN 201110235971A CN 102359865 B CN102359865 B CN 102359865B
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Abstract
The invention provides rapid testing methods of polarized light stability, the magnetic-optic modulation depth, the magnetic-optic modulation angle amplitude after linear polarized light is subjected to magnetic-optic modulation; and the invention also provides a testing device which can be used fro realizing the three testing methods to solve the technical problem existing in the prior art. The testing device comprises a light hole, a polarizing prism, a condensing lens, a photoelectric detector and a rotating mechanism which are sequentially arranged on an incident light path, wherein the rotating mechanism is used for driving the polarizing prism to rotate horizontally; and an angle testing encoding disk which is used for testing the horizontal rotation angle of the polarizing prism is arranged on the rotating mechanism. The testing methods are simple and convenient to operate and avoid adverse impacts of testing environments on the testing accuracy; and the testing device of the invention has the advantages of concise structure, good stability and higher testing accuracy.
Description
Technical field
The present invention relates to a kind of linearly polarized light magneto-optic effect detection method and pick-up unit thereof.
Background technology
In the precision measurement field of measuring techniques, the magneto-optic modulation technology of polarized light and polarized light is used very extensive, yet in application process, indefinite through the state behind the magneto-optic modulation for performance and the polarized light of the stability of polarisation, polarizer, thus affected final measuring accuracy.
At present, when application linearly polarized light magneto-optic modulation technology is carried out precision measurement, be to detect target with respect to the minor shifts amount of this benchmark through the polarized light behind the magneto-optic modulation as benchmark, or target measured through the state variation after the target according to polarized light.So, the performance of polarizer, very crucial for measuring through the performance of the polarized light behind the magneto-optic modulation, its stability directly has influence on the precision of measurement.By investigation, existing polarized light and polarized light magneto-optic effect pick-up unit exist that precision is low, volume is large, be subjected to the shortcoming such as environment for use Restricted requirement.
Summary of the invention
The object of the present invention is to provide a kind of linearly polarized light through the method for quick of magneto-optic modulation rear polarizer light stability, the magneto-optic modulation degree of depth, magneto-optic modulation angular width degree, a kind of pick-up unit that can realize above-mentioned three kinds of detection methods also is provided, has solved the technical matters that exists in the background technology.
Technical solution of the present invention is:
For the detection of polarized light stability, this linearly polarized light magneto-optic effect detection method may further comprise the steps:
1) polarizing prism is set, makes tested linearly polarized light be incident to polarizing prism light hole and outgoing to photodetector;
2) regulate polarizing prism, the light transmission shaft that makes polarizing prism and the optical axis of tested linearly polarized light with the vertical plane of polarized light incident direction in becomes 90 ° of angles, remember that the light transmission shaft of polarizing prism is positioned at a position, described plane at this moment;
3) horizontally rotate 90 ° of polarizing prisms, again according to the output signal of photodetector, the WidFin polarizing prism, make the light transmission shaft of polarizing prism become 0 ° or 180 ° of angles with the optical axis of tested linearly polarized light, remember this prism that shakes, make the light transmission shaft of polarizing prism become 0 ° or 180 ° of angles with the optical axis of tested linearly polarized light, the light transmission shaft of note polarizing prism this moment is positioned at b position, described plane, and record angle value at this moment;
4) multi-pass operations step 2) and 3);
5) according to the described value of taking measurement of an angle of many groups, statistical computation draws the degree of stability of tested linearly polarized light optical axis.
Above-mentioned steps 3) drawing the angle value corresponding with the b position is x
iStep 4) n step 2 of repetitive operation) and 3); Step 5) described statistical computation is according to following formula
Calculate the degree of stability δ of tested linearly polarized light optical axis.
For the detection of the magneto-optic modulation degree of depth and magneto-optic modulation angular width degree, this linearly polarized light magneto-optic effect detection method may further comprise the steps:
1) polarizing prism is set, makes tested linearly polarized light be incident to polarizing prism light hole and outgoing to photodetector;
2) regulate polarizing prism, make the light transmission shaft of polarizing prism and optical axis angle at 45 ° in the plane vertical with the polarized light incident direction of tested linearly polarized light, record the signal light intensity maximal value I that photodetector detects under this position
MaxWith minimum value I
Min
3) the tested magneto-optic modulation degree of depth through the magneto-optic modulation linearly polarized light calculates according to following formula;
η＝(I
max-I
min)/(I
max+I
min)
4) according to step 3) value of the magneto-optic modulation degree of depth η that obtains, the modulation angular width degree that calculates magneto-optic modulation is:
θ＝(arcsinη)/2。
A kind of linearly polarized light magneto-optic effect pick-up unit that can realize above-mentioned three kinds of detection methods is included in light hole, polarizing prism, collector lens and the photodetector that sets gradually on the input path and the rotating mechanism that horizontally rotates in order to drive polarizing prism; Be provided with the angle measurement code-disc that horizontally rotates angle in order to the tests polarization prism on the described rotating mechanism.
Above-mentioned polarizing prism, collector lens and photodetector place in the instrument mask of a sealing, and described photodetector is fixed on the interior bottom surface of this instrument mask; Described rotating mechanism is divided into upper and lower two parts, its middle and lower part comprises precision rotation axle and vernier adjustment knob and the locking knob of exporting as power on the pedestal that is installed on pick-up unit, top is stretched into and is formed swivel mount in the described instrument mask, and described polarizing prism and collector lens are positioned on the axis of this swivel mount and in the trim ring mode successively to be fixed.
Above-mentioned polarizing prism, collector lens place on the polarizing prism seat, and polarizing prism is fixed by gypsum, and collector lens is fixed by trim ring, and trim ring is threaded with the polarizing prism seat; The polarizing prism seat is fixed on the bottom surface in the instrument mask by screw.
Above-mentioned light hole is positioned at described instrument mask top, and the seal glass that discharges stress through quenching is installed in the light hole position, and seal glass is fixed by the cyclic spring trim ring, and described cyclic spring trim ring and instrument mask are threaded connection and are centered close on the described axis.
Above-mentioned angle measurement code-disc is divided into price fixing and Moving plate two parts, is individually fixed on pedestal and the precision rotation axle.
Above-mentioned photodetector is fixed on the signal processing circuit board, and this signal processing circuit board is fixed on the bottom surface in the instrument mask by screw, and photodetector is positioned under the collector lens.
Said base is with 20 " the leveling pedestal of level; Described 20 " level places outer upper end face between the upper and lower two parts of rotating mechanism, and is fixed by the gypsum embedding.
Detection method of the present invention is easy and simple to handle, avoided the adverse effect of test environment to accuracy of detection; Structure of the detecting device of the present invention is simple and clear, stability is better, and measuring accuracy is higher.
Description of drawings
Fig. 1 is the structural representation of pick-up unit of the present invention.
Fig. 2 is pick-up unit schematic side view of the present invention.
Fig. 3 is the light path synoptic diagram of pick-up unit when carrying out the detection of linearly polarized light magneto-optic effect.
The drawing reference numeral explanation:
1-seal glass trim ring; The 2-seal glass; The 3-instrument mask; The 4-polarizing prism;
5-polarizing prism seat; The 6-collector lens; The 7-collector lens is trim ring fixedly;
The 8-photodetector; 9-polarizing prism seat gib screw; The 10-signal is processed and control circuit board;
11-instrument mask gib screw; 12-high precision angle-measuring code-disc; The 13-turning axle is trim ring fixedly;
14-instrument mask attachment screw; 15-precision rotation axle; 16-rotating mechanism vernier adjustment knob;
17-rotating mechanism locking knob; The 18-base; 19-base locking knob;
20-levelling foot spiral shell;
21-20 " level; 22-liquid crystal display and control panel; 23-(rotating mechanism) locking and vernier adjustment knob axle; The 25-incident ray polarized light.
Embodiment
Linearly polarized light magneto-optic effect pick-up unit of the present invention is included in light hole, polarizing prism, collector lens and the photodetector that sets gradually on the input path and the rotating mechanism that horizontally rotates in order to drive polarizing prism; Be provided with the angle measurement code-disc that horizontally rotates angle in order to the tests polarization prism on the described rotating mechanism.
Polarizing prism, collector lens and photodetector place in the instrument mask of a sealing, and described photodetector is fixed on the interior bottom surface of this instrument mask; Described rotating mechanism is divided into upper and lower two parts, its middle and lower part comprises precision rotation axle and vernier adjustment knob and the locking knob of exporting as power on the pedestal that is installed on pick-up unit, top is stretched into and is formed swivel mount in the described instrument mask, and described polarizing prism and collector lens are positioned on the axis of this swivel mount and in the trim ring mode successively to be fixed.
Polarizing prism, collector lens place on the polarizing prism seat, and polarizing prism is fixed by gypsum, and collector lens is fixed by trim ring, and trim ring is threaded with the polarizing prism seat; The polarizing prism seat is fixed on the bottom surface in the instrument mask by screw.
Light hole is positioned at described instrument mask top, and the seal glass that discharges stress through quenching is installed in the light hole position, and seal glass is fixed by the cyclic spring trim ring, and described cyclic spring trim ring and instrument mask are threaded connection and are centered close on the described axis.
The angle measurement code-disc is divided into price fixing and Moving plate two parts, is individually fixed on pedestal and the precision rotation axle.
Photodetector is fixed on the signal processing circuit board, and this signal processing circuit board is fixed on the bottom surface in the instrument mask by screw, and photodetector is positioned under the collector lens.
Pedestal is with 20 " the leveling pedestal of level; Described 20 " level places outer upper end face between the upper and lower two parts of rotating mechanism, and is fixed by the gypsum embedding.
Use pick-up unit of the present invention, can finish the detection to a plurality of detected parameters in a complete operating process, the method may further comprise the steps:
1) pick-up unit is placed on the monitor station, make through the light hole of the linearly polarized light alignment detection means behind the magneto-optic modulation and with the pick-up unit leveling;
2) opening detecting device power switch, the rotating mechanism of rotation detecting device, make the light transmission shaft of polarizing prism on the pick-up unit become 90 ° of angles (can provide voice suggestion when rotating mechanism turns to this position) with tested linearly polarized light optical axis, and locking is with the locking knob of rotating mechanism.At this moment, whirligig is in position I;
3) keep the pick-up unit invariant position, rotating mechanism is rotated 90 ° (angle that rotating mechanism turns over can be read from LCDs) with respect to above-mentioned position I, locking knob is locked, select " optical axis measurement " key on the control panel, regulate the vernier adjustment knob on the rotating mechanism, make the light transmission shaft of polarizing prism on the pick-up unit become 0 ° or become 180 ° of angles (can provide voice suggestion when rotating mechanism turns to this position) with tested linearly polarized light optical axis, the orientation values that can read polarized light optical axis on the LCDs this moment, carry out according to the method described above repetition and measure for n time, according to formula
Calculate the degree of stability that can obtain tested linearly polarized light optical axis;
4) above-mentioned steps 2) after operation finishes, keep the pick-up unit invariant position, rotating mechanism is rotated 45 ° (angle that rotating mechanism turns over can be read from LCDs) with respect to above-mentioned position I, and locking knob is locked; Polarizing prism light transmission shaft and tested linearly polarized light optical axis included angle are 45 ° on the pick-up unit at this moment, and photodetector detects signal light intensity and can be expressed as:
I
max＝I
0(1+sin2θ)/2 (1)
I
min＝I
0(1-sin2θ)/2 (2)
I
0The signal light intensity that photodetector detects when being 0 ° for polarizing prism light transmission shaft on the pick-up unit and linearly polarized light optical axis included angle; θ is the modulation angular width degree of magneto-optic modulation
The depth of modulation that calculates magneto-optic modulation according to formula (1), (2) can be expressed as:
η＝(I
max-I
min)/(I
max+I
min) (3)
Select " depth of modulation " button on the control panel, can obtain the magneto-optic modulation degree of depth η of tested polarized light this moment on the LCDs, and precision is ± 1%;
5) keeping pick-up unit to be in step 4) position is constant, selects " the modulation angular width degree " button on the control panel, and can obtain the magneto-optic modulation angular width degree θ of tested polarized light this moment on the LCDs, precision is ± 30 ";
By the depth of modulation η of magneto-optic modulation=(I
Max-I
Min)/(I
Max+ I
MinThe modulation angular width degree that)=sin 2 θ can obtain magneto-optic modulation is θ=(arcsin η)/2, and the value of the magneto-optic modulation degree of depth η that detection obtains according to step (4) just can obtain modulating angular width degree θ.
6) by means of this pick-up unit, can to inclined to one side performance of devices, do preliminary determination and analysis such as the Extinction Characteristic of polarizing prism, the stability of magneto-optic modulation crystal etc. according to the aforesaid operations method;
7) this pick-up unit is applicable to the detection that the magneto-optic modulation signal is sine wave signal, and original modulated signal can be introduced pick-up unit as synchronizing datum signal.Pick-up unit becomes the judgement of 90 ° of angle positions to the light transmission shaft of polarizing prism on it with tested linearly polarized light optical axis be that two frequency-doubled signals that detect original modulated signal are as the criterion, and original modulated signal is detected the accuracy of detection that its two frequency-doubled signal helps to improve system as reference signal.
Can find out that detection method of the present invention is easy and simple to handle, can avoid test environment to the adverse effect of accuracy of detection; Structure of the detecting device of the present invention is simple and clear, stability is better, and measuring accuracy is higher.
Claims (8)
1. linearly polarized light magneto-optic effect detection method may further comprise the steps:
1) polarizing prism is set, makes tested linearly polarized light be incident to polarizing prism light hole and outgoing to photodetector;
2) regulate polarizing prism, the light transmission shaft that makes polarizing prism and the optical axis of tested linearly polarized light with the vertical plane of polarized light incident direction in becomes 90 ° of angles, remember that the light transmission shaft of polarizing prism is positioned at a position, described plane at this moment;
3) horizontally rotate 90 ° of polarizing prisms, again according to the output signal of photodetector, the WidFin polarizing prism, make the light transmission shaft of polarizing prism become 0 ° or 180 ° of angles with the optical axis of tested linearly polarized light, the light transmission shaft of note polarizing prism this moment is positioned at b position, described plane, and record angle value at this moment;
4) multi-pass operations step 2) and 3);
5) according to the described value of taking measurement of an angle of many groups, statistical computation draws the degree of stability of tested linearly polarized light optical axis;
Wherein, to draw the angle value corresponding with the b position be x to step 3)
iN step 2 of step 4) repetitive operation) and 3); The described statistical computation of step 5) is according to following formula
Calculate the degree of stability δ of tested linearly polarized light optical axis.
2. linearly polarized light magneto-optic effect detection method may further comprise the steps:
1) polarizing prism is set, makes tested linearly polarized light be incident to polarizing prism light hole and outgoing to photodetector;
2) regulate polarizing prism, make the light transmission shaft of polarizing prism and optical axis angle at 45 ° in the plane vertical with the polarized light incident direction of tested linearly polarized light, record the signal light intensity maximal value I that photodetector detects under this position
MaxWith minimum value I
Min
3) the tested magneto-optic modulation degree of depth through the magneto-optic modulation linearly polarized light calculates according to following formula;
η=(I
max-I
min)/(I
max+I
min)
4) value of the magneto-optic modulation degree of depth η that obtains according to step 3), the modulation angular width degree that calculates magneto-optic modulation is:
θ=(arcsinη)/2。
3. a linearly polarized light magneto-optic effect pick-up unit is characterized in that: be included in light hole, polarizing prism, collector lens and the photodetector that sets gradually on the input path and the rotating mechanism that horizontally rotates in order to drive polarizing prism; Be provided with the angle measurement code-disc that horizontally rotates angle in order to the tests polarization prism on the described rotating mechanism;
Described polarizing prism, collector lens and photodetector place in the instrument mask of a sealing, and described photodetector is fixed on the interior bottom surface of this instrument mask; Described rotating mechanism is divided into upper and lower two parts, its middle and lower part comprises precision rotation axle and vernier adjustment knob and the locking knob of exporting as power on the pedestal that is installed on pick-up unit, top is stretched into and is formed swivel mount in the described instrument mask, and described polarizing prism and collector lens are positioned on the axis of this swivel mount and in the trim ring mode successively to be fixed.
4. linearly polarized light magneto-optic effect pick-up unit according to claim 3, it is characterized in that: described polarizing prism, collector lens place on the polarizing prism seat, polarizing prism is fixed by gypsum, and collector lens is fixed by trim ring, and trim ring is threaded with the polarizing prism seat; The polarizing prism seat is fixed on the bottom surface in the instrument mask by screw.
5. described linearly polarized light magneto-optic effect pick-up unit according to claim 3, it is characterized in that: described light hole is positioned at described instrument mask top, the seal glass that discharges stress through quenching is installed in the light hole position, seal glass is fixed by the cyclic spring trim ring, and described cyclic spring trim ring and instrument mask are threaded connection and are centered close on the described axis.
6. described linearly polarized light magneto-optic effect pick-up unit according to claim 3, it is characterized in that: described angle measurement code-disc is divided into price fixing and Moving plate two parts, is individually fixed on pedestal and the precision rotation axle.
7. described linearly polarized light magneto-optic effect pick-up unit according to claim 3, it is characterized in that: described photodetector is fixed on the signal processing circuit board, this signal processing circuit board is fixed on the bottom surface in the instrument mask by screw, and photodetector is positioned under the collector lens.
8. described linearly polarized light magneto-optic effect pick-up unit according to claim 3 is characterized in that: described pedestal is with 20 " the leveling pedestal of level; Described 20 " level places outer upper end face between the upper and lower two parts of rotating mechanism, and is fixed by the gypsum embedding.
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| CN105404316A (en) * | 2015-12-21 | 2016-03-16 | 四川大学 | Array type position attitude fine tuning method |
| CN107576617B (en) * | 2017-09-11 | 2023-08-08 | 中国科学院云南天文台 | High-rigidity miniature photoelectric detection polarization correction wheel |
| CN109238467B (en) * | 2018-08-29 | 2021-03-09 | 中国农业大学 | Light polarization degree measuring device |
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| US3740151A (en) * | 1971-08-02 | 1973-06-19 | Hewlett Packard Co | Analyzer employing magneto-optic rotation |
| CN2598094Y (en) * | 2002-12-18 | 2004-01-07 | 江南造船(集团)有限责任公司 | Level regulator |
| CN201149528Y (en) * | 2007-11-21 | 2008-11-12 | 北京光电技术研究所 | Apparatus for measuring optically-active angle of activizer |
| JP2011106943A (en) * | 2009-11-17 | 2011-06-02 | Nec Corp | Measurement apparatus |
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