Light source for measuring multispectral seawater wide-angle volume scattering function

Abstract

The invention discloses a light source for measuring a multispectral seawater wide-angle volume scattering function. The light source comprises a motor driving part, a rotating frame part and a light selecting part, the rotating frame part comprises a light selecting disc bearing seat, and a light outlet hole is formed in the end face of the light selecting disc bearing seat. The light selecting part comprises a multi-band laser set which is driven by the motor driving part to rotate so that light beams emitted by different lasers can be emitted out through light emitting holes of the optical disc bearing seat. According to the invention, the function of the multispectral light source is realized in a manner that the motor directly drives the micro semiconductor lasers with high collimation and depolarization in different wave bands to pass through the same light outlet hole in a time-sharing manner. The collimation degree of the light source is high, the output process is easy to control, the light splitting frequency is adjustable and controllable, the light splitting wavelength is adjustable, and the use and the size of the multispectral light source are greatly simplified and reduced.

Description

technical field [0001] The invention relates to light source equipment, in particular to a light source for measuring the scattering function of a multispectral seawater wide-angle body. Background technique [0002] The volume scattering function (VSF, β(λ, φ)) is an important inherent optical parameter describing the angular distribution of light scattered on a scatterer in a water body. It is the wavelength (λ) and the scattering angle (φ) The function of the function is an urgently needed technology in the field of optical oceanography such as water color remote sensing, underwater military target tracking, and ecosystem modeling. At present, the wide-angle body scattering function online / profile measurement technology is basically a single wavelength. Compared with the angle distribution of the body scattering function In terms of research, there are very few studies on the wavelength distribution characteristics of the volume scattering function, and the relevant data ...

AI Technical Summary

Problems solved by technology

The realization of multi-spectral light source is generally achieved by white LED or halogen lamp with different color filters that are mechanically rotated. This method has a relatively simple structure, but the collimation of the output light is poor, the divergence angle is large, and the light utilization rate is low. Another method is to use different color lasers to couple the output through a single-mode fiber. This method can control the divergence angle of the light output, but the volume is large and the cost is high. It is used for underwater profiles and has a high angular resolution. Scattering flux measurement sensor For wide-angle body scattering function measurement technology with a small field of view, the collimation of the light source, the accuracy of the divergence angle, and the volume of the light source directly determine the angular resolution of the scattering measurement, the reliability of the scattering signal detection, the degree of background pollution, and the calibration. Accuracy and data reliability

[0003] At present, the use of multi-band to measure the scattering function of sea water in foreign countries is mature for the measurement of back-body scattering at a single angle or no more than three angles. The above-mentioned instruments use a light source of one band to aim at a detector to realize the measurement of body scattering functions at different angles and different wavelengths. It adopts a large field of view structure and does not require high collimation of the light source. This structure is feasible for volume scattering function measuring instruments with less scattering angles, but for wide-angle volume scattering function measuring instruments, the arrangement of the above optical structure is not feasible. sex

For the measurement of wide-angle body scattering function, limited by technical conditions, it is basically a single-wavelength detection. , it is necessary to replace the light source of different bands and then measure. The process is time-consuming and cumbersome, and it is easy to cause errors in the measurement due to installation accuracy and other issues. Polarized light can effectively detect scattered light signals. The design methods of multi-band light sources with the above two structures have great difficulty in realizing circular polarization or depolarization.

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