CN103925994B

CN103925994B - Improve the electricity structure of DMD Hadamard transform spectrometer code efficiency

Info

Publication number: CN103925994B
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: 2016-01-13
Anticipated expiration: 2034-03-27
Also published as: CN103925994A

Abstract

Improve the electricity structure of DMD Hadamard transform spectrometer code efficiency, belong to photoelectric instrument manufacturing technology field, in order to the problem solving the coding of prior art Hadamard transform spectrometer, acquisition time is grown very much, control FPGA by Hadamard strip encoding data pre-storage in FLASH; Cortex-M3 sends the order starting to encode to FPGA by RS-232; After FPGA receives order, read 255 frame strip encoding data in FLASH and, in DDR2 internal memory, drive DMD broadcast encoder striped by DAD, spectrum is encoded; After DMD is stable, the synchronizing signal that can send FPGA triggers Cortex-M3 and gathers spectral signal, the signal collected by detector is amplified by DC amplification circuit and ADC carries out being converted to digital signal, finally the signal recorded is left in Cortex-M3, decode after all codings complete.

Description

Improve the electricity structure of DMD Hadamard transform spectrometer code efficiency

Technical field

The present invention relates to a kind of electricity structure improving DMD 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.Introducing due to DMD light-splitting device makes Hadamard encode and becomes flexible and changeable, is easy to programming Control.DMD spatial light modulator comprises small independently movable eyeglass in a large number, the path that these eyeglasses can guide light directive two different by control circui, completes and controls the digital coding of spectrum.Domestic and international many experts and scholars are studied DMD Hadamard transform spectrum.At home, mainly carry out developing have Xi'an ray machine imaging spectrometer, the spectrometer of University Of Chongqing.The cataloged procedure of hada transform spectrometer often produces a strip encoding, to once optical spectrum encoded, gathers a secondary data.The Hadamard transform spectrometer that prior art is general is all carry out strip encoding download, coding-control, data acquisition etc. by host computer, and the amplifying circuit of detector adopts lock-in amplify circuit simultaneously.Like this due to the time bottleneck of host computer and slave computer communication, the factors such as lock-in amplify circuit time used.Make the coding of Hadamard transform spectrometer, acquisition time very long, the coding of 255 rank Hadamard transform spectrometers wants a few minutes consuming time, and can not meet a large amount of, real-time measurement, practicality reduces greatly; Meanwhile, this kind of dependence of structure to host computer is larger, and control procedure is complicated, and the interface of host computer and spectrometer is many, gives in the rugged surroundings such as outdoor to use and makes troubles.

Summary of the invention

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

Technical scheme of the present invention is:

Improve the electricity structure of DMD Hadamard transform spectrometer code efficiency, comprise master control board and DMD control panel,

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

First profit computerizeds control FPGA by Hadamard strip encoding data pre-storage in FLASH before operation; Work computer-chronograph and Cortex-M3 chip communication, Cortex-M3 chip sends the order starting to encode to FPGA by RS-232; After FPGA receives the order of Cortex-M3 chip, first read 255 frame strip encoding data in FLASH and, in DDR2 internal memory, then drive DMD broadcast encoder striped by DAD, spectrum is encoded; After DMD is stable, the synchronizing signal that can send FPGA triggers Cortex-M3 chip and gathers spectral signal, first the signal that detector collects is amplified by DC amplification circuit, then undertaken being converted to digital signal by ADC chip, finally the signal recorded is left on the register in Cortex-M3 chip, judge after often collecting a signal whether coding completes, if do not completed, play next frame strip encoding and spectrum is encoded and continues to gather; After coding completes, with the machine-readable decoding data got in Cortex-M3 chip on register of calculating.

Beneficial effect of the present invention: the collection frame frequency that this arrangement enhances spectrometer, a few minutes original to the Hadamard coding on 255 rank shortened to less than one second, and a large amount of, the real-time measurement of Hadamard transform spectrometer is become a reality; The control needing host computer to participate in application process is little, and the interface of host computer and spectrometer only has the data line of a USB2.0, and other rate-determining steps is all integrated on two control panels, lays a good foundation for spectrometer departs from host computer use.

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 made up of Cortex-M3 chip 1, ADC chip 2, amplifying circuit 3 and detector 4; DMD control panel carries DDR2 internal memory 5 by programmable FPGA6, High-Speed-Board, high-capacity FLASH 7, DAD8 and DMD9 form.

Cortex-M3 chip 1 is integrated with the code of each element of control spectrometer and can stores spectroscopic data.Cortex-M3 chip 1 has three effects: 1. can be communicated with host computer by USB data line; 2. communicated by RS-232 and FPGA6; 3. spectrum investigating system image data is controlled on 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. strip encoding is read in DDR2 internal memory 5; 3. communicate with Cortex-M3 chip 1; 4. core drived control is carried out to DMD9 and DAD8.

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 and modulates spectrum in optical system.

As shown in Figure 2, before operation, first profit computerizeds control FPGA6 by Hadamard strip encoding data pre-storage in FLASH7.During work, computing machine communicates with Cortex-M3 chip 1, and Cortex-M3 chip 1 sends the order starting to encode to FPGA6 by RS-232; After FPGA6 receives the order of Cortex-M3 chip 1, first read 255 frame strip encoding data in FLASH7 and, in DDR2 internal memory 5, then drive DMD9 broadcast encoder striped by DAD8, spectrum is encoded; After DMD9 is stable, the synchronizing signal that can send FPGA6 triggers Cortex-M3 chip 1 pair of spectral signal and gathers, first the signal that detector 4 collects is amplified by DC amplification circuit 3, then undertaken being converted to digital signal by ADC chip 2, finally the signal recorded is left on the register in Cortex-M3 chip 1, judge after often collecting a signal whether coding completes, if do not completed, play next frame strip encoding and spectrum is encoded and continues to gather; After coding completes, with the machine-readable decoding data got in Cortex-M3 chip 1 on register of calculating.

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 made up 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), DAD (8) and DMD (9) by programmable FPGA (6), High-Speed-Board and forms;

Before operation, first profit computerizeds control FPGA (6) by Hadamard strip encoding data pre-storage in FLASH (7); During work, computing machine communicates with Cortex-M3 chip (1), and Cortex-M3 chip (1) sends the order starting to encode to FPGA (6) by RS-232; After FPGA (6) receives the order of Cortex-M3 chip (1), first 255 frame strip encoding data are read in FLASH (7) in DDR2 internal memory (5), then drive DMD (9) broadcast encoder striped by DAD (8), spectrum is encoded; After DMD (9) is stable, the synchronizing signal that can send FPGA (6) triggers Cortex-M3 chip (1) and gathers spectral signal, first the signal that detector (4) collects is amplified by amplifying circuit (3), then undertaken being converted to digital signal by ADC chip (2), finally the signal recorded is left on the register in Cortex-M3 chip (1); Judge after often collecting a signal whether coding completes, if do not completed, play next frame strip encoding and spectrum is encoded and continues to gather; After coding completes, with calculating the machine-readable decoding data got in Cortex-M3 chip (1) on register.

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

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

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

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