Spectral measurement device and spectral measurement method based on acousto-optic modulation
A spectral measurement and acousto-optic modulation technology, applied in the field of optical measurement, can solve the problems of narrow spectral measurement range, low resolution, difficult fabrication, etc., and achieve the effect of wide spectral measurement range, high resolution, and easy fabrication.
Active Publication Date: 2015-10-21
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to overcome the existing technical problems of the existing spectrum measurement device such as large volume, high cost, difficult manufacture, sensitivity to vibration, low resolution, narrow spectrum measurement range, etc., and provide a device based on Acousto-optic modulation spectrum measurement device and spectrum measurement method
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[0027] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:
[0028] The idea of the present invention is to use the acousto-optic modulator to perform acousto-optic modulation on the incident light to be measured, measure the modulated light power under a set of different sound field intensities, and obtain the spectrum of the incident light to be measured by solving a linear equation set.
[0029] In order to optically shape the incident light, in this example, the incident light is first passed through an optical collimation device, and the structure of the optical collimation device is as follows figure 1 As shown, it includes two confocal lenses 1, and a pinhole diaphragm 2 is arranged at the common focus of the two lenses 1, and the incident light can be converted into parallel light after passing through the optical collimation device. This not only enables only parallel light to be incident on the acoust...
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The invention discloses a spectrum measurement device and method based on acousto-optic modulation and belongs to the technical field of optical measurement. The spectrum measurement device comprises an acoustic optical modulator and a light detector which are sequentially arranged in the direction of incident light. Light power detected by the light detector under different sound field intensities is measured, acquired light power data constitute an augmented matrix, the augmented matrix is combined with a coefficient matrix constituted by detectivities of the light detector for different-frequency incident light under different sound field intensities, and accordingly a linear equation system is established; the linear equation system is solved, light power of each frequency component in the incident light to be measured is acquired and is then subjected to linear fitting, and the spectrum of the incident light to be measured is acquired through spectrum radiometric calibration. Compared with the prior art, the spectrum measurement device and method based on acousto-optic modulation have the advantages of being high in vibration resistance performance and resolution ratio, wide in spectrum measurement range and the like.
Description
technical field [0001] The invention relates to a spectrum measurement device, in particular to a spectrum measurement device and a spectrum measurement method based on acousto-optic modulation, belonging to the technical field of optical measurement. Background technique [0002] A spectrometer is an important optical instrument. It is an important device that combines optical methods with modern electronic data processing systems to accurately analyze the structure, composition and content of substances by obtaining spectral information of research substances. With the development of spectrometers , and now its application fields have become more and more extensive, such as astronomical observation, biological research, medicine and pharmaceutical research, national defense, petrochemical and so on. Due to its important scientific research value, the spectrometer has attracted more and more people's attention, and it has become an important part of modern scientific instru...
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IPC IPC(8): G01J3/433
Inventor 杨涛黄维许超李兴鳌周馨慧仪明东何浩培刘辉
Owner NANJING UNIV OF POSTS & TELECOMM