CN1361443A - Method of vertically transmitting azimuth angle - Google Patents
Method of vertically transmitting azimuth angle Download PDFInfo
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- CN1361443A CN1361443A CN00135479A CN00135479A CN1361443A CN 1361443 A CN1361443 A CN 1361443A CN 00135479 A CN00135479 A CN 00135479A CN 00135479 A CN00135479 A CN 00135479A CN 1361443 A CN1361443 A CN 1361443A
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Abstract
The present invention is the method for vertically transmitting azimuth angle to ensure horizontal synchronism between two, one upper and one lower, equipments without mechanical connection. Light from light source is first converted in a polarizer into linear polarized light, which is modulated in a magnetooptical modulator, then passes through a analyzer and converted into electrical signal in a photoelectronic receiver. When the frequency selecting amplifier detects no signal with frequency equal to the said modulation frequency, the azimuth angle of the analyzer is equal to the azimuth angle of the polarizer so completing the vertical transmission of azimuth angle.
Description
The present invention relates to a kind of two level orientation simultaneous techniquess of not having the equipment room of machinery connection up and down, specifically a kind of method that realizes the orientation angles vertical transmission of guaranteeing.
The orientation angles vertical transmission is meant at two equipment rooms that do not have the machinery connection up and down that are positioned on the different level and realizes that level orientation is synchronous.At present, this technology is mainly used in military purposes, does not see relevant report.Allegedly have and adopt big area array CCD to videotape and method of picture processing realizes that the orientation of equipment room is synchronous up and down, but that the shortcoming of this method is the volume of equipment is big that lock in time is long, the depth of parallelism of equipment room is up and down required height.The method that adopts polarized light to add electrooptical modulation is also arranged, and its shortcoming is to add several kilovolts high pressure on electro-optic crystal, thereby required equipment is complicated, and externally can produce electromagnetic interference (EMI).
The purpose of this invention is to provide the method that a kind of synchronization accuracy is higher, operate the vertical transmission of better simply realization orientation angles.
The solution that realizes the object of the invention is: the method for the realization orientation angles vertical transmission that is provided is as follows:
1) light that light source is sent is converted to linearly polarized light by the polarizer,
2) with magneto-optic modulator above-mentioned linearly polarized light is modulated:
A, magneto-optic modulator by magnetic rotation glass and outward the hot-wire coil on this magnetic rotation glass form,
B, on the hot-wire coil of magneto-optic modulator, add a modulation signal U, U=U.Sin ω t, in the formula: ω---angular frequency, t---time, U.---amplitude,
C, allow the magnetic rotation glass of above-mentioned linearly polarized light by magneto-optic modulator,
3) allow above-mentioned linearly polarized light after ovennodulation by analyzer, be converted to electric signal by photelectric receiver again,
4) above-said current signal is delivered to frequency-selecting amplifier,
5) rotate above-mentioned analyzer, the orientation angles of above-mentioned analyzer equates with the orientation angles of the polarizer when equaling the signal of aforementioned modulating frequency less than frequency when frequency-selecting amplifier detects.
The present invention utilizes the physics characteristic of linearly polarized light to realize the vertical transmission of orientation angles, thereby guarantees that the orientation between equipment up and down or instrument is synchronous.The installation accuracy that the present invention has equipment up and down or an instrument requires lower, and reaction velocity is very fast, the advantage that lock in time is short.Owing to adopted magneto-optic modulation measure, change luminous intensity measurement into light frequency and measure, the orientation transmitting accuracy is greatly improved, and has eliminated the interference of atmospheric disturbance, reduced requirement to environment for use.In addition, operating voltage required for the present invention is lower, can not produce electromagnetic interference (EMI) to other equipment.
Fig. 1 is a theory diagram of the present invention.
Fig. 2 is magneto-optic modulation principle figure of the present invention.
As shown in Figure 1: the ordinary light source 1 and the polarizer---polaroid 2 is contained in the instrument, and magneto-optic modulator 3, analyzer---polaroid 4, photelectric receiver 5 and frequency-selecting amplifier 6 etc. are contained in down in the instrument.The light that light source 1 sends converts linearly polarized light to by polaroid 2, if again by behind another polaroid 4, the luminous flux φ that then passes through is: φ=φ.COO
2α, α in the formula---the angle between two polaroid light transmission shafts, φ.---amplitude.So penetrating light intensity will change with the variation of two polaroid light transmission shaft angle α when two polaroids 2,4 relatively rotate.When α=90 °, penetrating light intensity (being luminous flux) is zero.By detecting the variation of penetrating light intensity, can learn the orientation difference of the instrument up and down at two polaroid places, can realize the vertical transmission of orientation angles according to this principle, guarantee that the orientation and the last instrument of instrument are synchronous down, but the transmitting accuracy of this method is lower.In order to reach the transmission of high-precision orientation, the present invention adds a magnetic rotation glass in the light path of 2,4 of two polaroids, and magnetic rotation glass is outer around hot-wire coil, imposes alternating magnetic field.Magnetic rotation glass with outward around coil constitute a magneto-optic modulator 3.Modulated linearly polarized light passes through analyzer---and polaroid 4 backs are received by photelectric receiver 5, and convert electric signal to, deliver to frequency-selecting amplifier 6 then.
The magneto-optic modulation principle as shown in Figure 2.I among the figure---light intensity, θ---error angle, light intensity that curve M---photelectric receiver 5 is connect and the relation curve between error angle.Add a modulation signal U=U for during modulation the coil of magneto-optic modulator 3.Sin ω t (ω---angular frequency, t---time, U.---amplitude), if analyzer 4 and the polarizer 2 be on time, when just system is in non-delustring state (θ ≠ 0), as point of the A among the figure or B point, the output signal M of photelectric receiver 5
AOr M
BFrequency be the fundamental frequency of modulating frequency, be homophase or the anti-phase direction that can the judgement system departs from the delustring state according to output signal.Output signal is delivered to the drive unit of synchronizing linkage, drive down that instrument rotates, until instrumental azimuth unanimity up and down.When the instrumental azimuth was consistent up and down, promptly analyzer 4 was punctual with 2 pairs of the polarizers, and system is in delustring state (θ=0), as the C point of figure, the output signal M of photelectric receiver 5
CFrequency be two frequencys multiplication of modulating frequency.When practical operation, be to detect the signal that has or not frequency to equal to modulate fundamental frequency by frequency-selecting amplifier 6 to judge whether the orientation of instrument is consistent up and down.
Example:
Last instrument is positioned on two different surface levels with following instrument, and the light source and the polarizer are housed in the last instrument, in the following instrument magneto-optic modulator, analyzer, photelectric receiver and frequency-selecting amplifier etc. is housed.The light that light source sends is perpendicular to the level orientation of last instrument.The polarizer and analyzer adopt Glan---Taylor prism, and the Verdet constant of the magnetic rotation glass of magneto-optic modulator is 0.34～0.38, and the vertical transmission distance is 2.5～3m.Through testing: transmitting accuracy is 10 ", lock in time≤2min.
The present invention is not limited only to the transmission of level orientation angle, also can be used for the vertical transmission of non-level orientation angle.
Claims (1)
1, a kind of method that realizes the orientation angles vertical transmission is characterized in that:
1) light that light source is sent is converted to linearly polarized light by the polarizer,
2) with magneto-optic modulator above-mentioned linearly polarized light is modulated:
A, magneto-optic modulator by magnetic rotation glass and outward the hot-wire coil on this magnetic rotation glass form,
B, on the hot-wire coil of magneto-optic modulator, add a modulation signal U, U=U.Sin ω t, in the formula: ω---angular frequency, t---time, U.---amplitude,
C, allow the magnetic rotation glass of above-mentioned linearly polarized light by magneto-optic modulator,
3) allow above-mentioned linearly polarized light after ovennodulation by analyzer, be converted to electric signal by photelectric receiver again,
4) above-said current signal is delivered to frequency-selecting amplifier,
5) rotate above-mentioned analyzer, the orientation angles of above-mentioned analyzer equates with the orientation angles of the polarizer when equaling the signal of aforementioned modulating frequency less than frequency when frequency-selecting amplifier detects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00135479A CN1361443A (en) | 2000-12-29 | 2000-12-29 | Method of vertically transmitting azimuth angle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00135479A CN1361443A (en) | 2000-12-29 | 2000-12-29 | Method of vertically transmitting azimuth angle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1361443A true CN1361443A (en) | 2002-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN00135479A Pending CN1361443A (en) | 2000-12-29 | 2000-12-29 | Method of vertically transmitting azimuth angle |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156356A (en) * | 2011-04-29 | 2011-08-17 | 中国科学院西安光学精密机械研究所 | Optical isolator and isolation method |
| CN102927993A (en) * | 2012-10-08 | 2013-02-13 | 中国科学院西安光学精密机械研究所 | Vertical transmission indoor optical reference calibration system |
| CN103090844A (en) * | 2011-11-07 | 2013-05-08 | 中国人民解放军第二炮兵工程学院 | Space large-range azimuth automatic alignment method based magneto-optical modulation |
| CN103389064A (en) * | 2012-05-09 | 2013-11-13 | 中国人民解放军第二炮兵工程学院 | Sine wave magneto-optical modulation misalignment angle measurement method based on trigonometric function representation |
| CN111076697A (en) * | 2019-12-02 | 2020-04-28 | 中国科学院西安光学精密机械研究所 | Multi-target synchronous orientation device and orientation method |
| CN111273409A (en) * | 2020-01-20 | 2020-06-12 | 中国科学院西安光学精密机械研究所 | System and method for realizing angle transmission by using polarization maintaining optical fiber |
-
2000
- 2000-12-29 CN CN00135479A patent/CN1361443A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156356A (en) * | 2011-04-29 | 2011-08-17 | 中国科学院西安光学精密机械研究所 | Optical isolator and isolation method |
| CN102156356B (en) * | 2011-04-29 | 2013-01-09 | 中国科学院西安光学精密机械研究所 | Optical isolator and isolation method |
| CN103090844A (en) * | 2011-11-07 | 2013-05-08 | 中国人民解放军第二炮兵工程学院 | Space large-range azimuth automatic alignment method based magneto-optical modulation |
| CN103389064A (en) * | 2012-05-09 | 2013-11-13 | 中国人民解放军第二炮兵工程学院 | Sine wave magneto-optical modulation misalignment angle measurement method based on trigonometric function representation |
| CN103389064B (en) * | 2012-05-09 | 2015-07-08 | 中国人民解放军第二炮兵工程学院 | Sine wave magneto-optical modulation misalignment angle measurement method based on trigonometric function representation |
| CN102927993A (en) * | 2012-10-08 | 2013-02-13 | 中国科学院西安光学精密机械研究所 | Vertical transmission indoor optical reference calibration system |
| CN111076697A (en) * | 2019-12-02 | 2020-04-28 | 中国科学院西安光学精密机械研究所 | Multi-target synchronous orientation device and orientation method |
| CN111273409A (en) * | 2020-01-20 | 2020-06-12 | 中国科学院西安光学精密机械研究所 | System and method for realizing angle transmission by using polarization maintaining optical fiber |
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