CN101873173A

CN101873173A - High-speed optical data transmission system between rotating body and fixed body

Info

Publication number: CN101873173A
Application number: CN201010212397A
Authority: CN
Inventors: 徐圆飞; 王稷; 杨继文
Original assignee: Beijing Hangxing Technology Development Co Ltd
Current assignee: Beijing Hangxing Technology Development Co Ltd
Priority date: 2010-06-29
Filing date: 2010-06-29
Publication date: 2010-10-27
Anticipated expiration: 2030-06-29
Also published as: CN101873173B

Abstract

The invention relates to a high-speed optical data transmission system between a rotating body and a fixed body. Based on fiber optic transmission technology, the system is suitable for the slip ring system of an industrial CT, a high-end security detector or a medical CT to transmit detection data on the rotating body to the fixed body at a high speed with high reliability. The system comprises a data acquisition device, a transmitting device, a fiber optic collimating lens, a slide rail, a receiving device and a fiber optic coupler which are arranged on the rotating body, and a fiber optic rotary joint and an optical combiner which are arranged on the fixed body. Because high-speed data transmission is realized by fiber optic communication, the system has high transmission rate, low error rate and high anti-jamming capability, and meets the requirements of large-data volume high-speed transmission in the industrial CT, the high-end security detector or the medical CT.

Description

High speed optical data transmission system between a kind of rotary body and the fixed body

Technical field

The present invention relates to a kind ofly, relate in particular to the rotary body that is applicable in industrial CT system, safety check instrument and the Medical CT system and the high speed data transmission system between the fixed body based on the rotary body of optical fiber communication and the high speed data transmission system between the fixed body.

Background technology

In the industrial technology field, there are a lot of application scenarios need be to fixed body with the data information transfer on the rotary body, typical application is as in industrial CT system, safety check instrument and Medical CT system, when checked object is detected, need to be transferred on the fixed body to detected high speed information high reliability on the rotary body in real time.Initial data transmission system is that the mode by brush and conducting ring realizes, but since rotary body when rotated the contact resistance value between brush and the conducting ring constantly changing, this variation can produce very big signal noise, therefore thereby reduced reliability of data transmission, can not be used for the transmitting high speed data signal.Particularly under hyperbaric environment, the high-voltage noise that the electrion between rotary body and the fixed body causes is bigger.In addition, owing to the contact friction between carbon brush and the slip ring, also influenced the useful life of data transmission system.

Along with high-speed industrial CT system and Medical CT system with many row's x-ray detectors are used widely in actual detected, the detection data that system collected in the unit interval increase greatly, and the mode that adopts carbon brush to contact with slip ring realizes that transfer of data is more and more unreliable and desirable.Therefore, industry has proposed to replace above-mentioned carbon brush slip-ring mode with wireless capacity coupled mode, but wireless capacity coupled electromagnetic field is than the interference that is easier to be subjected to external voltage, electric current and electromagnetic field, so the accuracy of high speed data transfer and transmission rate are restricted and influence.

In order to solve the above problems, industry has also proposed the signal transmission system based on optics, as being in the patent application of CN101006925A at publication number, a kind of data transmission system based on optical fiber is disclosed, wherein, on rotary body, along the circumferential direction fix several electric light conversion elements (as laser diode) and condenser lens as signal emission part, the fiber bundle that one section finite length along the circumferential direction is set on fixed body receives the light signal of radiating portion emission and is sent to photo-electric conversion element, guarantee in real work to have at least a branch of radiating portion emitted light beams can drop on the fiber bundle on the fixed body.At publication number is in the patent application of CN 1989905A, a kind of data transmission system based on optical fiber is disclosed equally, different with CN101006925A is, on rotary body, only be provided with an electric light conversion element (as laser diode) and condenser lens in this patent application as signal emission part, on fixed body, along the circumferential direction be covered with optical fiber and receive the light signal of emission and be sent to photo-electric conversion element.But above-mentioned these two kinds of systems have all adopted more laser or optical fiber, and cost is higher, and practicality is restricted.

Summary of the invention

The object of the present invention is to provide a kind of high speed high reliability data transmission system between rotary body and the fixed body of being used for based on optical fiber communication, be particularly useful in the slip ring system of industry CT, safety check instrument and Medical CT, to realize being transferred to the detection data high-speed on the rotary body on the fixed body highly reliably, this high speed high reliability data transmission system comprises: data acquisition unit, and it is arranged on the rotary body; Sender unit, this sender unit is arranged on the rotary body; The fiber optic collimator mirror, it is installed in the sender unit; Slideway, it is installed on the fixed body; Signal receiving device, this signal receiving device is arranged in the slideway; Fibre-coupled mirrors, it is installed in the signal receiving device; Fiber rotation connector, it is arranged on the fixed body; The optical fiber mixer, it is arranged on the fixed body.

Wherein data acquisition unit links to each other with the fiber optic collimator mirror, have that analog electrical signal with X-ray receiving system conversion is converted to digital electric signal and this digital electric signal is converted to digital optical signal and by optical fiber with its function that transfers out.

The fiber optic collimator mirror can become the optical alignment in the optical fiber directional light to spatial emission, and fibre-coupled mirrors can focus on the directional light in space in the optical fiber, and fiber rotation connector can be with the optical transmission in the optical fiber of rotation in fixing optical fiber.

Description of drawings

Fig. 1 is the principle schematic of the data transmission system among the embodiment that proposes according to the present invention;

Fig. 2 is the profile of the emitter among the embodiment that proposes according to the present invention;

Fig. 3 is the slideway among the embodiment that proposes according to the present invention and the profile of receiving system.

Embodiment

As shown in Figure 1, optical fiber data transmission system proposed by the invention comprises rotary body 110, data acquisition unit 140, emitter 150, fiber optic collimator mirror 160, fibre-coupled mirrors 170, receiving system 180, slideway 190, fixed body 210, fiber rotation connector 220 and optical combiner 230.Wherein, data acquisition unit 140, emitter 150, fiber optic collimator mirror 160 all are installed on the rotary body 110, and X-ray emitter 120 and X-ray receiving system 130 also are installed on the rotary body 110; Slideway 190, fiber rotation connector 220 and optical combiner 230 all are installed on the fixed body 210, and receiving system 180 is arranged in the slideway, and fibre-coupled mirrors 170 is installed in the receiving system 180, and fixed body 210 outermost fine rules are represented the framework of fixed body 210.

In the scanning process of CT system, rotary body 110 is rotated by driven by motor, motor is not shown in Fig. 1, X-ray emitter 120 continues the emission X-ray and rotates with rotary body 110, described X-ray passes checked object between this X-ray emitter 120 and X-ray receiving system 130 and received by X-ray receiving system 130, X-ray receiving system 130 can be an analog electrical signal with the power conversion of the X-ray that receives, and this X-ray receiving system 130 can be the x-ray detector array of single row or multiple rows.

This X-ray receiving system 130 links to each other with data acquisition unit 140, and detected analog electrical signal is sent to this data acquisition unit 140, through converting digital electric signal to after analog-to-digital conversion and the corresponding data processing, in high speed CT system, data acquisition unit 140 generally also comprises electrooptic switching element 141, and digital electric signal is converted to digital optical signal and gives fiber optic collimator mirror 160 by Optical Fiber Transmission.In the system of reality, data acquisition unit 140 is connected with all fiber optic collimator mirror 160 by optical fiber splitter.

Emitter 150 is fixed on the circumference of rotary body 110, and fiber optic collimator mirror 160 is installed in the emitter 150, along the radial emission laser signal of rotary body 110, selects 2

emitter

150A and 150B in the present embodiment for use, and 180 degree are installed at interval.Fig. 2 is the cutaway view of emitter along vertical paper direction, and emitter has the convex cone body structure.Skid assemblies is installed on the fixed body, Fig. 3 is slideway and the cutaway view of receiving system along vertical paper direction, as shown in Figure 1, skid assemblies is made up of two

same slideway

190A and 190B up and down, 190B has been blocked by 190A fully in Fig. 1, two bearings 181 of receiving system 180 are installed in respectively in two slideways, can freely in slideway, slide, thereby driving receiving system slides in slideway, the length of skid assemblies 190 is 1.5 times of rotary body 110 girths, at slideway 190A, the 190B intermediate reach is installed 3

receiving system

180A, and 180B and 180C are to connect with the better rigidity steel wire between these three receiving systems tightly.As shown in Figure 3, fibre-coupled mirrors 170 is fixedly mounted in the receiving system 180, and receiving system 180 has the concave cone body structure, and its cone angle equates that with the cone angle of the convex cone of emitter in actual motion, convex cone and concave cone are meshed fully.As shown in Figure 1, receiving system 180A and engagement relative with emitter 150A respectively with 150B with 180B, at this moment fiber optic collimator mirror 160A, 160B are relative with fibre-coupled mirrors 170A, 170B respectively, thereby can carry out optical transmission, realize high speed optical communication.When rotary body 110 rotations, be fixed on the also rotation thereupon of emitter 150 on the rotary body 110,, the engagement of emitter and receiving system cone rotates because thereby driving receiving system 180, be rotated clockwise to the process of position at emitter 150B place from position shown in Figure 1 as emitter 150A like this, receiving system 180A also is rotated counterclockwise from position shown in Figure 1 to the position at receiving system 180B place, and in rotary course, it is relative with fibre-coupled mirrors 170A to remain fiber optic collimator mirror 160A, thereby guarantees that fiber optic collimator mirror 160A emitted laser signal can be got access to by fibre-coupled mirrors 170A fully.

When emitter 150A dextrorotation turnback, also dextrorotation turnback of emitter 150B, at this moment, receiving system 180A is rotated counterclockwise the position at 180B place, 180C is rotated counterclockwise the position at 180A place, and and engagement relative with emitter 150B, alternately relative engagement of emitter and receiving system like this, thereby the uninterrupted communication of realization optical communication.

Fiber optic collimator mirror 160 can become the optical alignment in the optical fiber directional light to spatial emission, fibre-coupled mirrors 170 can focus on the directional light in space in the optical fiber, fiber rotation connector 220 can be with the optical transmission in the optical fiber of rotation in fixing optical fiber, what adopt in the present invention is the triple channel fiber rotation connector, three fixed fiber passages of fiber rotation connector are connected on the three-in-one optical combiner 230, synthetic one road optical fiber output outputs in the image processing apparatus.

In the present invention, the number of emitter 150 and fiber optic collimator mirror 160 is preferably 2, the number of receiving system 180 and fibre-coupled mirrors 170 is preferably 3, but emitter, fiber optic collimator mirror, fibre-coupled mirrors and the receiving system of any number can be set according to the actual needs.Though the slideway length in the embodiments of the invention is 1.5 times of the rotary body girth, be not limited thereto, those skilled in the art can adopt any slideway of length of the present invention of can realizing to realize the present invention.

Claims

1. one kind based on the rotary body of optical fiber communication and the high speed data transmission system between the fixed body, it is characterized in that this high speed data transmission system comprises:

Data acquisition unit, it is arranged on the rotary body;

Two emitters, it is arranged on the rotary body;

Two fiber optic collimator mirrors, it is installed in the emitter respectively;

The skid assemblies structure, it is arranged on the fixed body, is made up of two same slideways;

Three receiving systems, it is arranged in the skid assemblies;

Three fibre-coupled mirrors, it is separately positioned in the receiving system;

Fiber rotation connector, it is arranged on the fixed body;

Optical combiner, it is arranged on the fixed body.

2. the high speed data transmission system described in claim 1, data acquisition unit wherein is converted to analog electrical signal digital electric signal and this digital electric signal is converted to digital optical signal, by optical fiber it is transferred out.

3. the high speed data transmission system described in claim 1, emitter wherein has the convex cone body structure, and is separated by and is arranged in 180 degree on this rotary body.

4. the high speed data transmission system described in claim 1, the length of skid assemblies wherein is 1.5 times of rotary body girth.

5. the high speed data transmission system described in claim 1, receiving system wherein has the concave cone structure, its cone angle equates with the cone angle of the convex cone of emitter, receiving system and emitter can mesh fully, it is arranged in the skid assemblies equally spacedly, and is connecting with steel wire between the receiving system tightly.

6. the high speed data transmission system described in claim 1, fiber rotation connector wherein is positioned at the centre of shape that skid assemblies surrounds.

7. the high speed data transmission system described in claim 1, wherein when rotary body rotates, an emitter and a relative and engagement of receiving system are arranged all the time, and Rotate 180 degree together, another emitter begins relative with another receiving system and engagement afterwards, and synchronous Rotate 180 degree.