CN1135600A - Heterodyne interference optical-fiber gyrosope - Google Patents
Heterodyne interference optical-fiber gyrosope Download PDFInfo
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- CN1135600A CN1135600A CN 95104260 CN95104260A CN1135600A CN 1135600 A CN1135600 A CN 1135600A CN 95104260 CN95104260 CN 95104260 CN 95104260 A CN95104260 A CN 95104260A CN 1135600 A CN1135600 A CN 1135600A
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Abstract
The heterodyne interference optical fiber gyroscope is made of a temp. drift controlled continuously-frequency-modulated single-longitudinal mode laser light source, a coupling lens, four optical fiber bidirectional couplers, a part of single-mode polarization-portecting optical fiber and a light detector on the continuous wave frequency-modulation heterodyne interference principle. It is a precision navigation instrument, and can accurately determine the angular velocity of rotational body, so it can be extensively used in the fields of navigation, aviation and earth measurement, etc.. It is light in weight, small in volume, high in accuracy, stable and reliable.
Description
The present invention is a kind of heterodyne interference optical-fiber gyrosope.It is a kind of precise navigation instrument, can accurately measure the angular velocity of rotating object, is used in fields such as space flight, aviation, navigation and geographic survey.
Existing fibre optic gyroscope adopts the homodyne principle of interference, and the variation of light source intensity directly influences the light intensity magnitude of interference fringe, so measuring accuracy is low.
The fibre optic gyroscope that the present invention proposes adopts continuous wave difference interference principle first.Because it is a rotational angular velocity of determining object by the phase change of measuring beat signal, the phase change of beat signal and the light intensity of light source change irrelevant, so its measuring accuracy is very high.This optical fibre gyro also have all optical fibre structure, in light weight, volume is little, advantage such as reliable and stable.
Heterodyne interference optical-fiber gyrosope is grown section single-mode polarization maintaining fiber (7) and photo-detector (8) formation by continuous frequency modulation single longitudinal mode laser light source (for example longitudinal mode semiconductor laser) (1), a coupled lens (2), four optical fiber bidirectional couplers (3), (4), (5), (6), one that a may command temperature is waftd as shown in Figure 1; Wherein, two output terminals of 1 * 2 coupling mechanism (3) are connected with an input end of 2 * 1 coupling mechanisms (4) and (6) respectively, the another one input end of coupling mechanism (4) and (6) is connected with two input ends of coupling mechanism (5) respectively, the output terminal of coupling mechanism (4) and (6) is connected with the two ends of one section single-mode polarization maintaining fiber (7) respectively, and makes fiber lengths sum between fiber lengths between coupling mechanism (3), (6) and coupling mechanism (4), (5) be not equal to fiber lengths sum between fiber lengths between coupling mechanism (3), (4) and coupling mechanism (5), (6); The laser that LASER Light Source is sent incides the input end of coupling mechanism (3) through coupled lens; The laser that penetrates from coupling mechanism (5) output terminal is received by photo-detector (8).
The principle of work of heterodyne interference optical-fiber gyrosope is such: the laser of frequency modulation that sends from LASER Light Source (1) is coupled to the input end of 1 * 2 fiber coupler (3) through coupled lens (2).Coupling mechanism (3) is divided into two-beam as beam splitter with laser beam, a branch of light is through coupling mechanism (4), single-mode polarization maintaining fiber (7), coupling mechanism (6) and coupling mechanism (5), last directive photo-detector (8), another Shu Guangjing coupling mechanism (6), single-mode polarization maintaining fiber (7), coupling mechanism (4) and coupling mechanism (5), last directive photo-detector (8).Because the light path difference walked of this two-beam, so difference interference will take place in this two-beam on the surface of photo-detector, the frequency of the beat signal of formation and depend on the optical path difference of this two-beam mutually.When object rotated, because match lattice nanogram effect, the frequency of beat signal was also relevant with the angular velocity of rotation of object mutually with the position.Detect the phase change of beat signal, can accurately measure the angular velocity of rotation of object.
In order to improve the degree of reliability of instrument, above-mentioned optical fibre gyro can also be adopted double-light-source structured, as shown in Figure 2, two light source difference interference optical fibre gyros are made of continuous frequency modulation single longitudinal mode laser light source (1) (2), two coupled lens (3) (4), two 2 * 2 optical fiber bidirectional couplers (5) (7), two 2 * 1 optical fiber bidirectional couplers (6) (8), a long section single-mode polarization maintaining fiber (9), optical filter (10) (11) and two photo-detectors (12) (13) of two different wave lengths.Wherein, compared to Figure 1, the primary structure of fibre optic gyroscope is constant, just 2 * 2 bidirectional couplers (5) and (7) among Fig. 2 are made in 1 * 2 bidirectional coupler (3) among Fig. 1 and (5), and adopt two different wavelength of laser light sources (1) and (2) illumination, receive the interference signal of different LASER Light Source respectively with two photo-detectors; Photo-detector (12) and (13) front need add bandpass filter respectively, so that distinguish the interference signal of different wave length laser.
Identical under the principle of work of double-light-source structured heterodyne interference optical-fiber gyrosope and the single light source situation, just in same difference interference type match lattice nanogram interferometer, adopt two to overlap independently laser interference light path, so in case some laser instruments break down, another laser interference system still can be worked.
Claims (2)
1, a kind of heterodyne interference optical-fiber gyrosope, it is characterized in that: as shown in Figure 1, the continuous frequency modulation single longitudinal mode laser light source (1), coupled lens (2), four optical fiber bidirectional couplers (3) (4) (5) (6), one section single-mode polarization maintaining fiber (7) and the photo-detector (8) that are waftd by a may command temperature constitute; Wherein, the laser that sends from LASER Light Source (1) is coupled to the input end of 1 * 2 optical fiber bidirectional coupler (3) through coupled lens (2), two output terminals of coupling mechanism (3) link to each other with an input end of 2 * 1 optical fiber bidirectional couplers (4) and (6) respectively, the another one input end of coupling mechanism (4) and (6) links to each other with two input ends of coupling mechanism (5) respectively, the output terminal of 2 * 1 coupling mechanisms (4) and (6) links to each other with the two ends of single-mode polarization maintaining fiber (7) respectively, and makes fiber lengths between the coupling mechanism (3) (6) and the fiber lengths sum between the coupling mechanism (4) (5) be not equal to fiber lengths between the coupling mechanism (3) (4) and the fiber lengths sum between the coupling mechanism (5) (6); The laser that penetrates from coupling mechanism (5) output terminal is received by photo-detector (8).
2, a kind of double-light-source structured heterodyne interference optical-fiber gyrosope, it is characterized in that, as shown in Figure 2, the continuous frequency modulation single longitudinal mode laser light source (1) (2) that is waftd by the may command temperature of two different wave lengths, two coupled lens (3) (4), two 2 * 2 bidirectional optical fiber coupling mechanisms (5) (7), two 2 * 1 bidirectional optical fiber coupling mechanisms (6) (8), one section single-mode polarization maintaining fiber (9), two different bandpass filter and two photo-detectors of selection wavelength constitute; Wherein, the two bundle laser that send from LASER Light Source (1) (2) are coupled into two input ends of bidirectional coupler (5) respectively through coupled lens (3) (4), two output terminals of coupling mechanism (5) link to each other with an input end of coupling mechanism (6) and (8) respectively, the another one input end of coupling mechanism (6) and (8) links to each other with two input ends of coupling mechanism (7) respectively, and the output terminal of coupling mechanism (6) and (8) links to each other with the two ends of single-mode polarization maintaining fiber (9) respectively.And make fiber lengths between the coupling mechanism (5) (8) and the fiber lengths sum between the coupling mechanism (6) (7) be not equal to fiber lengths between the coupling mechanism (5) (6) and the fiber lengths sum between the coupling mechanism (7) (8): to pass through bandpass filter (10) (11) respectively from the laser beam of two output terminals outputs of coupling mechanism (7), at last respectively by photo-detector (12) and (13) reception.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95104260 CN1135600A (en) | 1995-05-08 | 1995-05-08 | Heterodyne interference optical-fiber gyrosope |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95104260 CN1135600A (en) | 1995-05-08 | 1995-05-08 | Heterodyne interference optical-fiber gyrosope |
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| CN1135600A true CN1135600A (en) | 1996-11-13 |
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| CN 95104260 Pending CN1135600A (en) | 1995-05-08 | 1995-05-08 | Heterodyne interference optical-fiber gyrosope |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1307404C (en) * | 2003-01-28 | 2007-03-28 | 电子科技大学 | Interference type optical fiber gyroscope based on MZ interference principle |
| CN101360969B (en) * | 2005-12-30 | 2011-06-22 | 郑刚 | Differentiel birefringent fiber frequency-modulated continuous-wave sagnac gyroscope |
| CN111947641A (en) * | 2020-08-06 | 2020-11-17 | 大连理工大学 | White light interference optical fiber gyroscope based on rhombic optical path difference offset structure |
-
1995
- 1995-05-08 CN CN 95104260 patent/CN1135600A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1307404C (en) * | 2003-01-28 | 2007-03-28 | 电子科技大学 | Interference type optical fiber gyroscope based on MZ interference principle |
| CN101360969B (en) * | 2005-12-30 | 2011-06-22 | 郑刚 | Differentiel birefringent fiber frequency-modulated continuous-wave sagnac gyroscope |
| CN111947641A (en) * | 2020-08-06 | 2020-11-17 | 大连理工大学 | White light interference optical fiber gyroscope based on rhombic optical path difference offset structure |
| CN111947641B (en) * | 2020-08-06 | 2022-09-20 | 大连理工大学 | White light interference optical fiber gyroscope based on rhombic optical path difference offset structure |
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