Micro fiber spectrometer based oncortex-M3

Abstract

The invention relates to a micro fiber spectrometer based oncortex-M3. The micro fiber spectrometer comprises an optical imaging system, an acquisition and processing system of a spectrum electric signal and a host computer software system. A folded and crossed non-symmetric Czerny-Turner structure is employed by the optical imaging system which comprises an incident slit, a collimation lens, a plane diffraction grating, a focusing reflection mirror and a linear array CCD. The acquisition and processing system of the spectrum electric signal comprises an impedance matching circuit, a CCD front end processing chip, and a cortex-M3 processor. The micro fiber spectrometer has the advantages of compact optical structure, simplified spectral telecommunication acquisition system, high using efficiency of cortex-M3 chip function, stable, rapid and low-noise spectral signal performance, and convenient system use.

Description

technical field [0001] The invention belongs to the field of spectrum detection instruments, and in particular relates to a Cortex-M3-based miniature optical fiber spectrometer. Background technique [0002] Spectrometry is a technology for measuring light intensity in ultraviolet, visible, near-infrared and infrared bands, and is widely used in many fields, such as color measurement, concentration measurement of chemical components or radiometric analysis, film thickness measurement, gas composition analysis, etc. . Ordinary mechanical spectrometers, in order to meet the requirements of high sensitivity and high resolution, usually use a stepping motor to drive the rotation of the grating to scan the light to be measured, use a photomultiplier tube as a detector to receive different wavelengths, and then obtain its spectral power distribution . Therefore, a larger working box is required to meet the needs of driving and transmission, which makes the volume, weight and pow...

AI Technical Summary

Problems solved by technology

The scheme using single-chip microcomputer as the processor has the characteristics of simple programming and easy implementation, but because of its low working frequency, it affects the data transmission speed of the CCD spectrometer and reduces the real-time performance of the system

Therefore, the CCD spectrometer using a single-chip microcomputer as the main processor generally cannot be applied to occasions such as LED sorting machines that require high spectral real-time performance.

A spectrometer using FPGA or CPLD as a processor can achieve a higher working speed, but this type of processor interface resources are poor, and programming is difficult, so it is not suitable to add complex data processing algorithms inside the processor

Therefore, the work of data processing can only be handed over to the host computer, which will cause problems such as high memory usage and slow response speed of the host computer, and it is not convenient for the product to perform underlying encryption

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