CN201170771Y

CN201170771Y - Image-rebuilding device for optical chromatography detection

Info

Publication number: CN201170771Y
Application number: CNU2007203003149U
Authority: CN
Inventors: 万雄; 柴明钢; 刘桃丽; 江宏武
Original assignee: Nanchang Hangkong University
Current assignee: Nanchang Hangkong University
Priority date: 2007-12-17
Filing date: 2007-12-17
Publication date: 2008-12-24
Anticipated expiration: 2017-12-17

Abstract

The utility model provides an image reconstructor used for optical chromatographic detection, which comprises a nonstandard high precision image collection card, a chromatographic reconstruction module and a FPGA chip. The nonstandard high precision image collection card is connected with the chromatographic reconstruction module, and the nonstandard high precision image collection card and the chromatographic reconstruction module are jointly connected with the FPGA chip. The image reconstructor for optical chromatographic detection is controlled by the FPGA chip. The image reconstructor has the advantages that the reconstruction speed and the reconstruction accuracy are improved; the image reconstructor measures more flexibly and conveniently and has more use value in optical chromatographic measurement compared with the prior computer software based reconstruction three-dimensional flow field.

Description

Be used for the equipment for reconstructing image that optical chromatography detects

Technical field

The utility model relates to a kind of equipment for reconstructing image that optical chromatography detects that is used for.

Background technology

Optical chromatography technology (Optical Computed Tomography is called for short OpCT or OCT) is a kind of three-dimensional flow field measuring technology, comprises holographic interference chromatography, emission spectral chromatography, moire grating chromatography, light beam deviation chromatography etc.At present, these optical chromatography technology all extensively adopt CCD (photoelectric coupled device) to obtain data for projection, and go out the parameter distribution of three-dimensional flow field by certain tomographic reconstruction algorithm computation.Tomographic reconstruction is the committed step that optical chromatography is measured, and has determined speed and the precision measured.It is the digital video signal that the analog video signal that utilizes image pick-up card that CCD is collected changes standard into that common optical chromatography is rebuild, enter data into then in the computing machine, by computing machine three-dimensional flow field physical quantity inside to be measured is rebuild by software programming.This kind method exists in actual measurement that A/D conversion accuracy is not high, reconstruction speed is crossed shortcomings such as can't realizing measurement in real time slowly, can't satisfy the requirement of modern industry to the high-precision high-speed degree.

Summary of the invention

The purpose of this utility model provides a kind of equipment for reconstructing image that optical chromatography detects that is used for, and this device can not only be realized the high precision collecting of data for projection, and can realize the real-time reconstruction of field to be measured, is completely free of in the past measuring method to the dependence of computing machine.

The utility model is achieved like this, it comprises non-standard high precision image capture card, tomographic reconstruction module and fpga chip, non-standard height image capture card and tomographic reconstruction interconnect, and connect a fpga chip jointly, by the control of same fpga chip realization to device, non-standard high precision image breadload is by 8 AD9200 modulus conversion chips, 8 LM1881 vision signal Sync Separator Chip fpga chips and active crystal oscillator are formed, every AD9200 modulus conversion chip is formed one road video processing circuit with LM1881 vision signal Sync Separator Chip and is connected fpga chip, and the chromatography module all realizes in chip.

The utility model has the advantages that: improved the speed and the precision of rebuilding, with respect to the computer software reconstruction of three-dimensional flow field method of present use, has measured more flexibly, convenient, in the optical chromatography measurement, better use value has been arranged.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model.

Non-standard high precision image capture card 2, tomographic reconstruction module 3, fpga chip 4, active crystal oscillator in the drawings, 1,

Embodiment

In Fig. 1, the utility model is divided into non-standard high precision image capture card 1 and tomographic reconstruction module 2 two parts.Two parts are connected to each other, and realize in same FPGA chip 3 with convenient control to system.

The data for projection sampler of non-standard high precision image capture card is the black and white area array CCD, gathers the video standard signal of PAL (staggered scanning) form of its output.The entire image capture card is made up of the active crystal oscillator of the modulus conversion chip AD9200 of 8 10Bit, 8 LM1881 vision signal Sync Separator Chip, 50MHz., every AD9200 and LM1881 form one road video processing circuit.

Active crystal oscillator 4 is used to provide time clock, and M is the divider ratio of frequency divider, and RUN is the operating switch of this system, control whole system operation and stationary state.When RUN was effective, system was in running order, and CCD is to AD9200 and LM1881 input simulating signal.The LM1881 chip is exported the foundation of HS (composite synchronizing signal) and ODEV (parity field) signal identification line data and field data to FPGA.FPGA gating N road AD chip wherein carries out AD conversion to ccd signal, the corresponding FIFO of gating simultaneously, and the FIFO of gating carried out buffer memory and output control, and export handshake during output data simultaneously, handling for follow-up data provides control signal.These internal system data are parallel processing, and the data of line output 10Bit.

Claims

1, a kind of equipment for reconstructing image that is used for the optical chromatography detection, it comprises non-standard high precision image capture card, tomographic reconstruction module and fpga chip, it is characterized in that non-standard height image capture card and tomographic reconstruction interconnect, and connect a fpga chip jointly, by the control of same fpga chip realization to device.

2, the equipment for reconstructing image that is used for the optical chromatography detection according to claim 1, it is characterized in that non-standard high precision image breadload is made up of 8 AD9200 modulus conversion chips, 8 LM1881 vision signal Sync Separator Chip, fpga chip and active crystal oscillators, every AD9200 modulus conversion chip is formed one road video processing circuit with LM1881 vision signal separated in synchronization core and is connected fpga chip.