CN103925994A

CN103925994A - Electricity structure for improving DMD Hadamard transformation spectrograph coding efficiency

Info

Publication number: CN103925994A
Application number: CN201410120046.7A
Authority: CN
Inventors: 刘华; 全向前; 许家林; 卢振武; 王晓朵; 党博石
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: 2014-03-27
Filing date: 2014-03-27
Publication date: 2014-07-16
Anticipated expiration: 2034-03-27
Also published as: CN103925994B

Abstract

The invention discloses an electricity structure for improving the DMD Hadamard transformation spectrograph coding efficiency, and belongs to the technical field of photoelectric instrument manufacturing. In order to solve the problem that in the prior art, a Hadamard transformation spectrograph is quite long in encoding and collecting time and controls an FPGA to prestore Hadamard coding stripe data in a FLASH, the electricity structure is provided. A Cortex-M3 sends a coding beginning instruction to the FPGA through an RS-232, after the FPGA receives the instruction, 255-frame coding stripe data in the FLASH are read in a DDR2 internal storage, a DAD drives a DMD to play coding stripes for coding of spectra, when the DMD is stabilized, the FPGA sends a synchronizing signal to trigger the Cortex-M3 to collect spectrum signals, signals collected by a detector are amplified by a direct-current amplifying circuit and converted through an ADC to obtain digital signals, finally, the measured signals are stored in the Cortex-M3, and decoding is performed after coding is completed.

Description

Improve the electricity structure of DMD Hadamard transform spectrometer code efficiency

Technical field

The present invention relates to a kind of electricity structure of the DMD of raising Hadamard transform spectrometer code efficiency, belong to photoelectric instrument manufacturing technology field.

Background technology

Hadamard transform spectrometer is the same with Fourier transform spectrometer,, is a kind of novel digital conversion spectrometer.Because the introducing of DMD light-splitting device makes Hadamard coding, become flexible and changeable, be easy to programming Control.DMD spatial light modulator comprises a large amount of small independently movable eyeglasses, and these eyeglasses are controlled by circuit can guide two different paths of light directive, completes the digital coding of spectrum is controlled.Domestic and international many experts and scholars are studied DMD Hadamard transform spectrum.At home, mainly develop have Xi'an ray machine imaging spectrometer, the spectrometer of University Of Chongqing.The cataloged procedure of hada transform spectrometer is strip encoding of every generation, to once optical spectrum encoded, gathers a secondary data.The Hadamard transform spectrometer that prior art is general is all to carry out strip encoding download by host computer, coding-control, and data acquisition etc., the amplifying circuit of detector adopts phase-locked amplifying circuit simultaneously.Like this due to the time bottleneck of host computer and slave computer communication, the factors such as phase-locked amplifying circuit time used.Make coding, the acquisition time of Hadamard transform spectrometer very long, the coding of 255 rank Hadamard transform spectrometers is wanted a few minutes consuming time, can not meet a large amount of, real-time measurement, and practicality reduces greatly; Meanwhile, this kind of structure is larger to the dependence of host computer, and control procedure is complicated, and the interface of host computer and spectrometer is many, to using and make troubles in the rugged surroundings such as outdoor.

Summary of the invention

Very long in order to solve coding, the acquisition time of prior art Hadamard transform spectrometer, can not meet the problem of a large amount of, real-time measurement, the invention provides a kind of electricity structure of the DMD of raising Hadamard transform spectrometer code efficiency.This electricity structure adopts slave computer programming, and the coding of spectrometer, capture program are write on master control board and DMD control panel; Strip encoding is shifted to an earlier date to programming carries on FLASH to DMD control panel plate simultaneously; Inter-sync signal by DMD triggers detector image data; Detector signal adopts direct current to amplify mode.

Technical scheme of the present invention is:

The electricity structure that improves DMD Hadamard transform spectrometer code efficiency, comprises master control board and DMD control panel,

Master control board is comprised of Cortex-M3 chip, ADC chip, amplifying circuit and detector; DMD control panel carries DDR2 internal memory, high-capacity FLASH, DAD and DMD by programmable FPGA, High-Speed-Board and forms;

Work before first utilize computer control FPGA by Hadamard strip encoding data pre-storage in FLASH; Work computer-chronograph and Cortex-M3 chip communication, Cortex-M3 chip sends the order that starts coding to FPGA by RS-232; FPGA receives after the order of Cortex-M3 chip, first reads 255 frame strip encoding data in FLASH and, in DDR2 internal memory, then by DAD, drives DMD broadcast encoder striped, and spectrum is encoded; After DMD is stable, the synchronizing signal that can send FPGA triggers Cortex-M3 chip spectral signal is gathered, first signal detector being collected amplifies by DC amplification circuit, then by ADC chip, be converted to digital signal, finally the signal recording is left on the register in Cortex-M3 chip, after often collecting a signal, judge whether coding completes, if do not completed, play next frame strip encoding and spectrum is encoded and continue collection; After coding completes, with calculating the machine-readable decoding data on register in Cortex-M3 chip of getting.

Beneficial effect of the present invention: this structure has improved the collection frame frequency of spectrometer, shortens to less than one second to the Hadamard coding on 255 rank original a few minutes, and a large amount of, the real-time measurement of Hadamard transform spectrometer is become a reality; In application process, need the control of host computer participation seldom, the interface of host computer and spectrometer only has the data line of a USB2.0, and other is controlled step and is all integrated on two control panels, for spectrometer departs from host computer use, lays a good foundation.

Accompanying drawing explanation

Fig. 1: the present invention improves the electricity structure schematic diagram of DMD Hadamard transform spectrometer code efficiency.

Fig. 2: the present invention improves the electricity structure workflow diagram of DMD Hadamard transform spectrometer code efficiency.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in further details.

As shown in Figure 1, master control board is comprised of Cortex-M3 chip 1, ADC chip 2, amplifying circuit 3 and detector 4; DMD control panel carries DDR2 internal memory 5, high-capacity FLASH 7, DAD8 and DMD9 by programmable FPGA6, High-Speed-Board and forms.

Cortex-M3 chip 1 is integrated to be controlled the code of each element of spectrometer and can store spectroscopic data.Cortex-M3 chip 1 has three effects: 1. can with host computer, be communicated by usb data line; 2. by RS-232 and FPGA6, communicate; 3. control spectrum investigating system image data to register.

ADC chip 2, amplifying circuit 3 and detector 4 form spectrum investigating system.

ADC chip 2 is analog to digital converter, and simulating signal is converted to digital signal.

Amplifying circuit 3 adopts direct current to amplify, and improves picking rate.

Detector 4 gathers spectral signal.

DDR2 internal memory 5 is for buffer memory Hadamard strip encoding.

FPGA6 has four effects: 1. to programming strip encoding in FLASH7; 2. read strip encoding in DDR2 internal memory 5; 3. communicate with Cortex-M3 chip 1; 4. DMD9 and DAD8 are carried out to core driving control.

FLASH7 has 255 frame strip encoding images.

DAD8 provides the reset drives function of high voltage source and micro mirror for DMD9.

DMD9 serves as coding templet spectrum is modulated in optical system.

As shown in Figure 2, work before, first utilize computer control FPGA6 by Hadamard strip encoding data pre-storage in FLASH7.During work, computing machine is communicated by letter with Cortex-M3 chip 1, and Cortex-M3 chip 1 sends the order that starts coding to FPGA6 by RS-232; FPGA6 receives after the order of Cortex-M3 chip 1, first reads 255 frame strip encoding data in FLASH7 and, in DDR2 internal memory 5, then by DAD8, drives DMD9 broadcast encoder striped, and spectrum is encoded; After DMD9 is stable, the synchronizing signal that can send FPGA6 triggers 1 pair of spectral signal of Cortex-M3 chip and gathers, first signal detector 4 being collected amplifies by DC amplification circuit 3, then by ADC chip 2, be converted to digital signal, finally the signal recording is left on the register in Cortex-M3 chip 1, after often collecting a signal, judge whether coding completes, if do not completed, play next frame strip encoding and spectrum is encoded and continue collection; After coding completes, with calculating the machine-readable decoding data on register in Cortex-M3 chip 1 of getting.

Claims

1. improve the electricity structure of DMD Hadamard transform spectrometer code efficiency, comprise master control board and DMD control panel, it is characterized in that,

Master control board is comprised of Cortex-M3 chip (1), ADC chip (2), amplifying circuit (3) and detector (4); DMD control panel is by programmable FPGA(6), High-Speed-Board carries DDR2 internal memory (5), high-capacity FLASH (7), DAD(8) and DMD(9) form;

Work before, first utilize computer control FPGA(6) by Hadamard strip encoding data pre-storage to FLASH(7) in; During work, computing machine is communicated by letter with Cortex-M3 chip (1), Cortex-M3 chip (1) by RS-232 to FPGA(6) send the order start coding; FPGA(6) receive after the order of Cortex-M3 chip (1), first read FLASH(7) in 255 frame strip encoding data in DDR2 internal memory (5), then pass through DAD(8) drive DMD(9) broadcast encoder striped, spectrum is encoded; As DMD(9) stable after, FPGA(6) can send a synchronizing signal triggering Cortex-M3 chip (1) gathers spectral signal, first signal detector (4) being collected amplifies by DC amplification circuit (3), then by ADC chip (2), be converted to digital signal, finally the signal recording left on the register in Cortex-M3 chip (1).After often collecting a signal, judge whether coding completes, if do not completed, play next frame strip encoding and spectrum is encoded and continue collection; After coding completes, with calculating the machine-readable decoding data on register in Cortex-M3 chip (1) of getting.

2. the electricity structure of raising according to claim 1 DMD Hadamard transform spectrometer code efficiency, Cortex-M3 chip (1) is integrated to be controlled the code of each element of spectrometer and can store spectroscopic data; Cortex-M3 chip (1), it can be communicated with host computer by usb data line; It is by RS-232 and FPGA(6) communicate; It controls spectrum investigating system image data to register.

3. the electricity structure of raising according to claim 2 DMD Hadamard transform spectrometer code efficiency, described spectrum investigating system is by ADC chip (2), amplifying circuit (3) and detector (4) formation; Detector (4) gathers spectral signal, through amplifying circuit (3) direct current, amplifies, and improves picking rate, then passes through ADC chip (2) simulating signal is converted to digital signal.

4. the electricity structure of raising according to claim 1 DMD Hadamard transform spectrometer code efficiency, DDR2 internal memory (5) is for buffer memory Hadamard strip encoding.

5. the electricity structure of raising according to claim 1 DMD Hadamard transform spectrometer code efficiency, FPGA(6) to DMD(9) and DAD(8) carry out core and drive and control.