CN114414482A - Multispectral seawater wide-angle body light source for scattering function measurement - Google Patents

Abstract

The invention discloses a multispectral seawater wide-angle body light source for scattering function measurement, which comprises a motor driving part, a rotating frame part and a light selecting part, wherein the rotating frame part is arranged on the rotating frame part; the rotating frame part comprises a disc selecting bearing seat, and the end surface of the disc selecting bearing seat is provided with a light outlet; the light selecting part comprises a multiband laser group which is driven by the motor driving part to rotate so as to enable light beams emitted by different lasers to be emitted through a light emitting hole of the optical disk bearing seat. The invention adopts the motor to directly drive the microminiature semiconductor lasers with higher collimation and depolarized different wave bands to realize the function of the multispectral light source in a mode of time sharing through the same light outlet hole. The light source has high collimation degree, simple control of an output process, adjustable and controllable light splitting frequency and adjustable light splitting wavelength, and the use and the volume of the multispectral light source are greatly simplified and miniaturized.

Description

A light source for multispectral seawater wide-angle volume scattering function measurement

technical field

The invention relates to light source equipment, in particular to a light source for measuring a multispectral seawater wide-angle bulk scattering function.

Background technique

The volume scattering function (VSF, β(λ, φ)) is an important intrinsic 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) It 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 online/profile measurement technology of the wide-angle bulk scattering function is basically a single wavelength, which is relative to the angular distribution of the bulk scattering function. In terms of research, there are very few studies on the wavelength distribution characteristics of the bulk scattering function, and the relevant data is extremely scarce. This is mainly due to the large dynamic range of the scattering signal and the high technical and technological requirements for the light source and optical detection unit. The multi-spectral and hyperspectral volume scattering characteristics are key parameters for the optimization and improvement of water color remote sensing and optical radiation transfer models, which can provide rich characteristic wavelength scattering information for ecosystem modeling and identification of red tides and their dominant algae. The realization of multi-spectral light source is generally realized by white LED or halogen lamp with different color filters that rotate mechanically. This method has a relatively simple structure, but the output light collimation is poor, the divergence angle is large, and the light utilization rate is low. Another method is to use different color lasers to couple out through a single-mode fiber. This method has a controllable light output divergence angle, but it is bulky and expensive. It is used for underwater sections with high angular resolution and scattered flux measurement sensors. For the wide-angle bulk scatter 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 scatter measurement, the reliability of scattered signal detection, the degree of background pollution, and the calibration. Accuracy and reliability of data.

At present, the use of multi-band measurement of seawater body scattering function in foreign countries is mature for single or no more than three angles of backscattering. It adopts a structure with a large field of view, which does not require high collimation of the light source. This structure is feasible for volume scatter function measuring instruments with less scattering angles, but for wide-angle volume scatter function measuring instruments, the arrangement of the above optical structure is not feasible. sex. For the measurement of the wide-angle bulk scattering function, limited by technical conditions, it is basically a single wavelength detection. In recent years, there are corresponding research progresses at home and abroad for the measurement of the wide-angle bulk scattering function of a single wavelength. However, if you need to measure the bulk scattering function of different wavelengths , it is necessary to replace the light source of different wavelength bands and then measure, the process is time-consuming and cumbersome, and it is easy to cause measurement errors due to problems such as installation accuracy. Only polarized light can effectively detect scattered light signals. The design methods of multi-band light sources with the above two structures have great difficulties in realizing circular polarization or depolarization.

SUMMARY OF THE INVENTION

In order to solve at least one technical problem existing in the above-mentioned background art, the present invention provides a light source for measuring the multispectral seawater wide-angle bulk scattering function.

For achieving the above object, the technical scheme of the present invention is:

A light source for multispectral seawater wide-angle bulk scattering function measurement, comprising a motor drive part, a rotating frame part and a light selection part;

The rotating frame part includes a selection disc bearing seat, and the end face of the selection disc bearing seat is provided with a light exit hole;

The light selection part includes a multi-band laser group, which is composed of a plurality of different wavelength bands, small divergence angles, circularly polarized collimated lasers, and is driven and rotated by the motor driving part, so that the laser beams emitted by the lasers of different wavelength bands are rotated. The light beam is emitted through the light exit hole of the optical disc bearing seat, and the multi-band laser group is controlled by the brush to realize contactless power supply.

Further, the motor driving part includes a motor, a reducer and a coupling; the rotating shaft of the motor is connected with the input end of the reducer, and the output end of the reducer is connected with the first coupling.

Further, the light selection part also includes a laser group locking disk, a laser group adjusting disk and a rotating shaft;

The laser group locking disk and the laser group adjusting disk have the same structure, the middle part is a shaft hole, laser mounting holes are distributed at intervals in the disk surface, and a first gap is set between two adjacent laser mounting holes; A second slot is arranged in the hole, the second slot divides the laser installation hole into two parts, and the two parts of the laser installation hole are connected by bolt locking;

The rotating shaft penetrates the rotating shaft holes of the laser group locking disk and the adjusting disk;

The laser is locked and installed in the laser installation hole, and the alignment adjustment is performed through the bolt on the second slot;

Further, the light selection part further includes a bearing, and the bearing is assembled in the end face of the selection disc bearing seat.

Further, the rotating frame part also includes a bearing planetary ring, and the bearing planetary ring includes a large bearing, a small bearing, a fixed ring, and a planetary ring; the small bearing is installed in the center hole of the planetary ring, and the outer ring of the small bearing is connected to the planetary ring. Ring interference fit; the planetary ring interference fit is installed on the inner ring of the large bearing, and the outer ring of the large bearing is fixed on the fixed ring; the fixed ring is installed and fixed inside the selection disc bearing seat; One end of the inner ring of the small bearing is installed in the bearing.

Further, the power supply wire and the control wire of the multi-band laser group pass through the planetary ring and the star hole of the large bearing, and are relatively fixed to the planetary ring.

Further, the rotating frame part also includes a brush fixing sleeve, a light selector, a second coupling, a brush, and a transmission shaft; the brush is installed inside the brush fixing sleeve and the light selector; the The transmission shaft passes through the brush, one end is connected with the first coupling, the other end is connected with the second coupling, and the second coupling is connected with the other end of the rotating shaft; the large diameter end of the light selection seat Connect with the open end of the selection disc bearing seat and fix it.

Further, the rotating shaft is formed by connecting the first rotating shaft and the second rotating shaft.

Further, the brush provides a stable power supply structure support for the entire rotation of the lead wire of the multi-band laser group, which includes an inner ring and an outer ring, the outer ring is fixed with the light selector, and the inner ring and the drive shaft are relatively fixed. The inner ring rotates synchronously with the drive shaft.

Further, the multi-band laser group includes a plurality of lasers with different wavelengths, the motor is a stepping motor, the stepping motor is driven and controlled by a control chip, and the switching state of the multi-band laser group is controlled by a MOS tube;

The divergence angle of the output beam of the multi-band laser group only depends on the divergence angle of each laser in the multi-band laser group.

Compared with the prior art, the present invention has the following beneficial effects:

The divergence angle and polarization degree of the multispectral light source provided by the present invention directly depend on the collimation degree, divergence angle and polarization degree of each laser in the laser group, which can effectively overcome the high cost, large volume of fiber coupling and the problem of optical splitting by filter. Poor collimation, large divergence angle, and complicated subsequent depolarization, etc., are especially suitable for optical measurement systems that require high light source collimation, especially for wide-angle body scattering with high angular resolution and small detection field of view. In the function measurement system, the collimation of the light source is high, the output process control is simple, the spectral frequency is adjustable and controllable, and the spectral wavelength is adjustable, which greatly simplifies and miniaturizes the use and volume of the multispectral light source.

Description of drawings

1 is a schematic diagram of the overall structure of a light source for measuring a multispectral seawater wide-angle bulk scattering function provided by an embodiment of the present invention;

2 is a schematic front view of a light source for measuring a multispectral seawater wide-angle bulk scattering function provided by an embodiment of the present invention;

Fig. 3 is the overall schematic diagram of the motor drive part;

Fig. 4 is the overall schematic diagram of rotating frame part;

Fig. 5 is the overall schematic diagram of light selection part;

Figure 6 is a schematic structural diagram of the bearing planetary ring;

7 is a schematic structural diagram of a light source adjusting disk and a light source locking disk;

8 is a cross-sectional view of a light source for measuring a multispectral seawater wide-angle bulk scattering function provided by an embodiment of the present invention;

In the figure: 1. Motor drive part: 11. Stepper motor; 12. Reducer; 13. First coupling; 2. Rotating frame part; 21. Brush fixing sleeve; Planetary ring; 231, large bearing; 232, small bearing; 233, fixed ring; 234, planetary ring; 24, selection disc bearing seat; 25, second coupling; 26, brush; 27, drive shaft; 3, Light selection part; 31, laser group adjustment plate; 32, laser group lock plate; 300, shaft hole; 301, laser installation hole; 302, first slot; 303, second slot; 33, first shaft; 34, Bearing; 35. Multi-band laser group; 36. Rotary shaft.

Detailed ways

Example:

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated connection. It can be a mechanical connection, an electrical connection or a signal connection; it can be directly connected or indirectly connected through an intermediate medium. It can be said that the two components are connected internally. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations. The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

1-8, the light source for measuring the multispectral seawater wide-angle bulk scattering function provided by this embodiment mainly includes a motor drive part 1, a rotating frame part 2 and a light selection part 3; wherein, the rotating frame part 2 includes a selection disc The bearing seat 24, the end face of the optical disc bearing seat 24 is provided with a light exit hole 241; the light selection part 3 includes a multi-band laser group, and the multi-band laser group 35 is composed of 4 different waveband circularly polarized lasers with a divergence angle less than 0.1mrad. And it is driven by the motor driving part 1 to rotate, so that the light beams emitted by different lasers are emitted through the light exit holes 241 of the optical disc bearing base 24 . That is to say, the light beams of different light sources will be emitted through the light exit holes 241 of the optical disc bearing base 24 , so the light beams of the light exit holes 241 will output circularly polarized collimated beams of different wavelength bands in time division with the rotation of the motor. In addition, the multi-band laser group is controlled by brushes to realize non-contact power supply, so as to better realize on-off control during its rotation process, and at the same time, it can effectively prevent the power supply wire from being entangled during the rotation process of the laser group.

It can be seen that the present invention adopts the method of time-sharing micro-miniature semiconductor lasers of different wavelength bands with high motor direct drive collimation degree and depolarization passing through the same light exit hole to realize the function of multi-spectral light source.

Specifically, the above-mentioned motor driving part 1 is mainly composed of a stepping motor 11 , a reducer 12 , and a first coupling 13 , wherein the rotating shaft of the stepping motor 11 is connected with the input end of the reducer 12 . The output end is coupled with the first coupling 13 . Its structure is shown in Figure 3.

Specifically, the above-mentioned light selection part 3 also includes a laser group locking disk 32, a laser group adjustment disk 31 and a rotating shaft; the rotating shaft is formed by connecting the first rotating shaft 33 and the second rotating shaft 36; as shown in Figures 5 and 7, The light source locking disk 32 has the same structure as the light source adjusting disk 31, and the middle part is the shaft hole 300, the laser mounting holes 301 are evenly distributed in the disk surface, and the first gap 302 is provided between the two adjacent laser mounting holes 301; The laser installation hole 301 is provided with a second slot 303, the second slot 303 divides the laser installation hole into two parts, and the two parts of the laser installation hole are connected by bolts; The shaft hole 300 of the disk 31; the laser is locked and installed in the laser mounting hole 301. In this way, since the first slit 302 is provided between the two adjacent laser mounting holes 301, and the second slit 303 is provided in the laser mounting hole 301, the light source locking disk 32 can make the multi-wavelength laser group 35 compact and uniform The light source adjustment disk 31 can use bolts to adjust the output direction of each laser group in the multi-band laser group 35 slightly through the second slit 303 to ensure the parallelism of the output beam of the multi-band light source. . In addition, the light selection part also includes a bearing 34 fitted in the end face of the selection disc bearing seat 24 .

Preferably, the above-mentioned rotating frame part also includes a bearing planetary ring 23 to ensure the rotation accuracy of the light selection part 3 and the repeated positioning accuracy of the multi-band laser group 35. As shown in FIG. 6, the specific components include: large bearings 231, Small bearing 232 , fixed ring 233 , planetary ring 234 . Specifically, the small bearing 232 is installed in the center hole of the planetary ring 234, and the outer ring of the bearing is in an interference fit with the planetary ring 234; ; The fixed ring is installed and fixed inside the selection disc bearing seat 24. A section of the rotating shaft is fixed with the inner ring of the small bearing 232, and one end is installed in the bearing 34. The power supply and control wires of the multi-band laser group pass through the star holes of the planetary ring 234 and the large bearing 231, and are opposite to the planetary ring 234. Fixed, when the optical selection part 3 is rotating, since the bearing planetary ring 23 is installed with two bearings, one large and one small, the large and small bearings and the bearing 34 can make the rotating shaft maintain a high rotation accuracy to ensure that the multi-band laser group 35 beams pass through For the repeatable positioning accuracy of the light outlet, the wires of the multi-band laser group 35 can also be kept relatively stationary with the star ring to avoid the wire winding due to the rotation of the light selection structure. Its structure is shown in Figure 5.

Specifically, as shown in FIG. 4 , the above-mentioned rotating frame part 2 further includes a brush fixing sleeve 21 , a light selection seat 22 , a second coupling 25 , a brush 26 , and a transmission shaft 27 . Among them, the brush 26 is installed inside the brush fixing sleeve 21 and the light selection seat 22. The transmission shaft 27 passes through the brush 26 and is connected to the first coupling 13 at one end, and is connected to the second coupling 25 at one end. The second coupling 25 is connected with the second rotating shaft 36, so that the stepping motor 11 can directly drive the light selection part 3 to rotate; For fixing, the bearing planetary ring 23 is mounted inside the bearing seat 24 by means of bolts, and its structure is shown in FIG. 3 . Further, the brush 26 can provide a stable power supply structure support for the entire rotation of the lead wire of the multi-band laser group 35, which includes an inner ring and an outer ring, the outer ring is fixed to the optical selector 22, and the inner ring and the transmission shaft 27. Remaining relatively fixed, the inner ring rotates synchronously with the transmission shaft 27 .

Specifically, four different wavelength lasers can be installed on the light selection part 3 to form a multi-band laser group, and the divergence angle of the output beam of the multi-band laser group only depends on the divergence angle of each laser in the multi-band laser group; A 28 stepper motor with a gear ratio of 27:1 is installed, and is installed and formed according to the above structure. The stepping motor 11 is driven and controlled by the LV8728MR, the switching state of the multi-band laser group 35 is controlled by the MOS tube, and the master control chip adopts STM32. That is to say, the multi-band optional light source provided by the present invention can be correspondingly adapted to the existing domestic self-developed water body scattering function measuring instrument (invention patent number: ZL201710253401.1), without reducing the measurement of the instrument Accuracy while improving the spectral resolution of instrument measurements.

The present invention can control the multi-band laser group 35 and the stepping motor 1 according to the programmed program. For example, the multi-band laser group 35 composed of four lasers with different wavelengths can be set to be always on, and the stepping motor can continuously rotate clockwise to change the light outlet and the wavelength of the outgoing beam; the four light sources 35 can also be turned on and off to rotate A whole week is regarded as a cycle, and is gated or blocked through the optical outlet.

To sum up, the divergence angle and polarization degree of the multispectral light source provided by the present invention are directly dependent on the collimation and divergence angle of each laser in the laser group, which can effectively overcome the high cost, large volume of fiber coupling and the problem of optical splitting by filters. Due to the problems of poor collimation, large divergence angle, and complicated subsequent depolarization, it is especially suitable for optical measurement systems that require high light source collimation, especially for wide-angle body scatter function measurement systems with high angular resolution. It has high collimation degree, simple output process control, adjustable and controllable spectral frequency, and adjustable spectral wavelength, which greatly simplifies and miniaturizes the use and volume of multi-spectral light sources, and has good originality; the light source design is clever The bearing planetary ring and the bearing group of the light selection part are used effectively, which effectively ensures that the user has a high repeatable positioning accuracy of the outgoing beam during the selection of the light source. By using the light source of the present invention, the purpose of improving the spectral resolution of seawater wide-angle volume scattering function measurement can be achieved.

The above-mentioned embodiments are only for illustrating the technical concept and characteristics of the present invention, and the purpose thereof is to enable those of ordinary skill in the art to understand the content of the present invention and implement them accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the essence of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A multispectral seawater wide-angle body light source for scattering function measurement is characterized by comprising a motor driving part, a rotating frame part and a light selecting part;

the rotating frame part comprises a disc selecting bearing seat, and the end surface of the disc selecting bearing seat is provided with a light outlet;

the light selection part comprises a multiband laser group, the multiband laser group consists of a plurality of circular polarization collimation lasers with different wave bands and is driven by a motor driving part to rotate, so that unpolarized collimated light beams emitted by the lasers with different wave bands are emitted out through a light outlet hole of an optical disc bearing seat, and the multiband laser group is controlled by an electric brush to realize contactless power supply.

2. The multispectral seawater wide-angle scatterometry light source of claim 1, wherein the motor driving portion comprises a motor, a reducer, and a first coupling; the rotating shaft of the motor is connected with the input end of the speed reducer, and the output end of the speed reducer is connected with the first coupler.

3. The multi-spectral seawater wide-angle body scattering function measuring light source of claim 1, wherein the light selecting part further comprises a laser set locking disc, an adjusting disc and a rotating shaft for driving the locking disc and the adjusting disc to rotate;

the laser group locking disc and the adjusting disc have the same structure, the middle part of the laser group locking disc is provided with a rotating shaft hole, a plurality of laser mounting holes are distributed in the disc surface at intervals, and a first gap is arranged between every two adjacent laser mounting holes; a second gap is arranged in the laser mounting hole, the laser mounting hole is divided into two parts by the second gap, and the two parts of laser mounting holes are locked and connected through bolts;

the rotating shaft penetrates through rotating shaft holes of the laser group locking disc and the adjusting disc;

the laser is locked and installed in the laser installation hole and is aligned and adjusted through the bolt on the second gap.

4. The multi-spectral seawater wide angle body scattering function measuring light source of claim 3 wherein said light selecting portion further comprises a bearing, said bearing being fitted in an end face of a light selecting disc bearing seat.

5. The multi-spectral seawater wide angle body scattering function measuring light source of claim 4 wherein said rotating frame portion further comprises a bearing planet ring, said bearing planet ring comprising a large bearing, a small bearing, a stationary ring, a planet ring; the small bearing is arranged in a central hole of the planet ring, and the outer ring of the small bearing is in interference fit with the planet ring; the planet ring is arranged on the inner ring of the large bearing in an interference fit manner, and the outer ring of the large bearing is fixed on the fixed ring; the fixed ring is fixedly arranged in the optical disc selecting bearing seat; the rotating shaft penetrates through and is fixedly installed on the inner ring of the small bearing, and one end of the rotating shaft is installed in the bearing.

6. The multi-spectral seawater wide angle body scattering function measuring light source of claim 5 wherein the wires of the multi-band laser set pass through the star holes of the planet ring and the large bearing and are fixed relative to the planet ring.

7. The multispectral seawater wide-angle scatterometry light source of claim 5, wherein said rotating frame portion further comprises a brush holder, a light selecting base, a second coupling, a brush, a transmission shaft; the electric brush is arranged in the electric brush fixing sleeve and the light selecting seat; the transmission shaft penetrates through the electric brush, one end of the transmission shaft is connected with the first coupler, the other end of the transmission shaft is connected with the second coupler, and the second coupler is connected with the other end of the rotating shaft; the large-diameter end of the light selecting seat is connected and fixed with the opening end of the light selecting disc bearing seat.

8. The multi-spectral seawater wide angle body scattering function measuring light source of claim 5 wherein said axis of rotation is formed by a first axis of rotation and a second axis of rotation.

9. The multispectral seawater wide-angle scattering function measurement light source of claim 7, wherein the electric brush provides stable power supply structure support for the whole-circle rotation of the lead-out wires of the multiband laser set, and comprises an inner ring and an outer ring, the outer ring is fixed with the light selecting seat, the inner ring is fixed relative to the transmission shaft, and the inner ring and the transmission shaft rotate synchronously.

10. The multispectral seawater wide-angle body scattering function measuring light source according to any one of claims 1 to 3, wherein the multiband laser set comprises a plurality of lasers with different wavelengths, the motor is a stepping motor, the stepping motor is driven and controlled by a control chip, and the switching state of the multiband laser set is controlled by an MOS (metal oxide semiconductor) tube; the divergence angle of the output beam of the multi-band laser set is dependent only on the divergence angle of each of the lasers in the multi-band laser set.

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