CN100405417C

CN100405417C - Apparatus for applying fiber-optic telecommunication technology on photoelectric transit data telecommunication

Info

Publication number: CN100405417C
Application number: CNB2005101077872A
Authority: CN
Inventors: 沈铖武; 曹永刚; 王晶; 沈成彬
Original assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Current assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Priority date: 2005-09-30
Filing date: 2005-09-30
Publication date: 2008-07-23
Anticipated expiration: 2025-09-30
Also published as: CN1897062A

Abstract

A device applying optical fiber communication technique on data communication of photoelectric theodolite consists of orientation shaft, the first and the second connection frames, the first and the second optical collimator tail fibers, the first and the second optical collimator tube shells, the first and the second optical collimator lens sets and base of theodolite. The device not only can raise transmission rate but also can avoid electromagnetic-wave interference on signal.

Description

A kind of device that Fibre Optical Communication Technology is applied to photoelectric transit data telecommunication

Technical field

The present invention relates to electro-optic theodolite, particularly the data communication of electro-optic theodolite.

Technical background

Because electro-optic theodolite is when work, the continuity that azimuth axis rotates to data transmission causes difficulty.At present, electro-optic theodolite is to utilize the method that conducting ring is installed on the level orientation axle that two cables are coupled together, realize the transmission of data, the device that utilizes conducting ring to carry out data transmission comprises: data acquisition system (DAS), conducting ring, data handling system, as shown in Figure 1.In the data transmission procedure, the data that data acquisition system (DAS) collects are passed through cable transmission to conducting ring with the form of electric signal, and conducting ring passes through cable transmission to data handling system with data again, has realized the continuity of data transmission.But, there is interference in the electric energy of the machine operation that conducting ring transmits simultaneously to the conducting ring internal signal, and also has interference between the conducting ring internal signal, makes the speed of data transmission and quality be affected, therefore, conducting ring has become one of bottleneck of transit development.Simultaneously, conducting ring need carry out loaded down with trivial details distribution work in installation process.

Summary of the invention

Low at the conducting ring message transmission rate, narrow bandwidth, problems such as anti-electromagnetic interference capability is weak, simultaneously for the scientific research personnel is freed from loaded down with trivial details conducting ring distribution work, the present invention proposes to utilize optical fiber communication speed height, bandwidth is wide, anti-electromagnetic interference capability is strong characteristics, replace traditional conducting ring transmission data mode, to improve bandwidth, speed and the quality of data transmission, data transmission procedure as shown in Figure 2.

The characteristics that the present invention utilizes light to propagate in air, realize the transmission of light signal between two sections optical fiber by a pair of optical collimator, its structure is divided into rotating part and fixed part: rotating part comprises: first link, the first optical collimator tail optical fiber, the first optical collimator shell, the first optical collimator lens combination; Fixed part comprises: the second optical collimator lens combination, the second optical collimator shell, the second optical collimator tail optical fiber, second link; First link links to each other with the transit azimuth axis, rotates with the transit azimuth axis; The first optical collimator shell links to each other with first link, rotates with first link; The first optical collimator tail optical fiber links to each other with the first optical collimator shell respectively with the first optical collimator lens combination, rotates with the first optical collimator shell; Second link is fixedlyed connected with the transit pedestal; The second optical collimator shell is fixedlyed connected with second link; The second optical collimator lens combination is fixedlyed connected with the second optical collimator shell respectively with the second optical collimator tail optical fiber, and the optical axis of the first optical collimator lens combination and the second optical collimator lens combination is coaxial with the transit azimuth axis.

The present invention compares with conducting ring, be transmitted as the contactless technical scheme of transmission of light signal by the contact that adopts the power transformation signal, has solved the problem that electric signal is subject to electromagnetic interference (EMI); Adopt a pair of optical collimator to carry out the beam-expanding collimation and the focusing of light beam respectively, realize the coupling of light beam between two sections optical fiber, the problem that the signal that the rotation of level orientation axle causes when both having solved owing to electro-optic theodolite work can't transmit continuously, solved the thin optic fibre fibre core again, be generally 50 μ m, aim at the very problem of difficulty.Biggest advantage of the present invention is to improve transfer rate, can avoid the influence of electromagnetic interference (EMI) again to signal, improve transmission quality, the loss of optical fiber is very low simultaneously, can realize long-distance transmissions, especially when utilizing many electro-optic theodolites to carry out the track and localization measurement, need the data that all transits that participates in measuring obtain are gathered, carry out analytical calculation.Because the transit that participates in measuring is a dispersed placement, therefore must there be the data of part transit collection to need long-distance transmissions.The optical fiber remarkable advantages of having compared with cable aspect fast and loss is hanged down in transmission speed, so optical fiber communication is more suitable for telecommunication.

Fibre Optical Communication Technology is applied to whole measurement performance and the dirigibility that electro-optic theodolite can improve electro-optic theodolite.The optical communication technique that this technology will become communication main flow mode day by day is applied to electro-optic theodolite or has among the instrument of similar rotational structure, has good application prospects and great practical value.

Description of drawings

Fig. 1 is the principle schematic of background technology

Fig. 2 utilizes the present invention to carry out the principle schematic of data transmission

Fig. 3 is that the structural representation of embodiments of the invention also is a Figure of abstract

Embodiment

The present invention is divided into top rotating part and following fixed part.Comprise among Fig. 3: transit azimuth axis 1, first link 2, the first optical collimator tail optical fiber 3, the first optical collimator shell 4, the first optical collimator lens combination 5, the second optical collimator lens combination 6, the second optical collimator shell 7, the second optical collimator tail optical fiber 8, second link 9, transit pedestal 10.

First link 2 and second link 9 adopt firm and are out of shape little metal material and make, the inwall of first link 2 is done and is dyed black the processing, their inwalls want more coarse simultaneously, to enter optical collimator again after the inwall reflection of reflected light that prevents the optical collimator lens surface through first link 2, produce and disturb, in order to absorb reflected light better, in black dyes, add the absorbing agent carbon black, carbon black can be with the basic all absorptions of the laser energy of visible and infrared wavelength; The first optical collimator tail optical fiber 3 and the second optical collimator tail optical fiber 8 are selected the optical fiber of different materials according to the operation wavelength of light emitting devices and optical pickup apparatus, it is 0.9mm that lens in the first optical collimator lens combination 5 and the second optical collimator lens combination 6 are selected radius, operation wavelength is consistent with light emitting devices and optical pickup apparatus operation wavelength, for example, when selecting operation wavelength to be the light emitting devices of 1310nm and optical pickup apparatus, the operation wavelength of first optical collimator and second optical collimator also should be selected 1310nm, and it is the G652 optical fiber of 1310nm that the first optical collimator tail optical fiber 3 and the second optical collimator tail optical fiber 8 are selected operation wavelength.After light beam expanded bundle and collimation through the first optical collimator lens combination 5, even transit optical axis that reason causes the first optical collimator lens combination 5 and the second optical collimator lens combination 6 such as installs or move not point-blank, the loss of luminous energy was also not too large.It is 0.9mm, 5mm, 8mm, 11mm that their lens adopt radius, for example lens employing radius is the optical collimator of 0.9mm, suppose that optical collimator is output as the equally distributed hot spot of light intensity, at the optical axis of the first optical collimator lens combination 5 and the second optical collimator lens combination 6 during at a distance of 0.1mm, the luminous energy loss is about 7%, during at a distance of 0.2mm, the luminous energy loss is about 16%, is about 0.76dB at the optical axis of the first optical collimator lens combination 5 and the second optical collimator lens combination 6.Because in the electro-optic theodolite communication system, communication distance is generally in several meters to tens meters scope, so the loss that optical fiber self causes can be ignored with respect to the total losses of system.If be controlled within the 0.2mm by the optical axis deviation of Machine Design with a pair of optical collimator, so, under the situation of taking into account system total interface place junction loss, the total losses maximal value of whole optical fiber telecommunications system one-way transmission will can not produce serious influence to the judgement of optical receiving end light signal below 3dB.If adopt the bigger optical collimator of aperture of lens, for example lens radius is 11mm, and the alignment precision for two optical collimator optical axises requires and can further reduce so, and the loss of synchronous signal also will reduce.At work, first optical collimator lens combination 5 of rotating and 6 fixing of the second optical collimator lens combination should be guaranteed dustless, no parasitic light, therefore need an enclosed hood, the inwall of enclosed hood should dye black, with the reflected light that prevents the first optical collimator lens combination 5 and the second optical collimator lens combination, 6 surfaces signal is produced interference, in the present invention, first link 2 had both played the effect that transit azimuth axis 1 and the first optical collimator shell 4 are linked together, and played the effect of enclosed hood again.

The data of data acquisition system (DAS) collection transfer to light emitting devices with electrical signal form in the course of the work, light emitting devices through Fig. 2 is converted to the light signal form, light signal is through Optical Fiber Transmission to the first optical collimator tail optical fiber 3, from the light signal of the first optical collimator tail optical fiber, 3 outgoing through the expansion bundle of the first optical collimator lens combination 5 and collimation after air transfer to the second optical collimator lens combination 6, focusing through the second optical collimator lens combination 6 enters the second optical collimator tail optical fiber 8, pass through Optical Fiber Transmission again to optical pickup apparatus, optical pickup apparatus transfers to data handling system after the light signal that receives is converted to electric signal, realize the continuity of data transmission, promptly use Fibre Optical Communication Technology and replace conducting ring, finish the data communication of electro-optic theodolite.

Claims

1. device that Fibre Optical Communication Technology is applied to photoelectric transit data telecommunication, comprise: transit azimuth axis (1), transit pedestal (10), it is characterized in that: also comprise rotating part and fixed part, wherein rotating part comprises: first link (2), the first optical collimator tail optical fiber (3), the first optical collimator shell (4), the first optical collimator lens combination (5); Fixed part comprises: the second optical collimator lens combination (6), the second optical collimator shell (7), the second optical collimator tail optical fiber (8), second link (9); First link (2) links to each other with transit azimuth axis (1), rotates with transit azimuth axis (1); The first optical collimator shell (4) links to each other with first link (2), rotates with first link (2); The first optical collimator tail optical fiber (3) links to each other with the first optical collimator shell (4) respectively with the first optical collimator lens combination (5), rotates with the first optical collimator shell (4); Second link (9) is fixedlyed connected with transit pedestal (10); The second optical collimator shell (7) is fixedlyed connected with second link (9); The second optical collimator lens combination (6) is fixedlyed connected with the second optical collimator shell (7) respectively with the second optical collimator tail optical fiber (8), and the optical axis of the first optical collimator lens combination (5) and the second optical collimator lens combination (6) is coaxial with transit azimuth axis (1).

2. a kind of device that Fibre Optical Communication Technology is applied to photoelectric transit data telecommunication according to claim 1, it is characterized in that: first link (2) and second link (9) adopt metal material to make, the inwall of first link (2) is done and is dyed black the processing, and inwall is made uneven surface simultaneously.

3. according to claim 1ly a kind of Fibre Optical Communication Technology is applied to the device of photoelectric transit data telecommunication, it is characterized in that: the lens radius in the first optical collimator lens combination (5) and the second optical collimator lens combination (6) is chosen as 0.9mm-11mm.