CN115326199A - Built-in push-broom hyperspectral imager with automatic focusing function - Google Patents
Built-in push-broom hyperspectral imager with automatic focusing function Download PDFInfo
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- CN115326199A CN115326199A CN202110934451.2A CN202110934451A CN115326199A CN 115326199 A CN115326199 A CN 115326199A CN 202110934451 A CN202110934451 A CN 202110934451A CN 115326199 A CN115326199 A CN 115326199A
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- 230000010354 integration Effects 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000010408 sweeping Methods 0.000 abstract description 12
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 6
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/06—Scanning arrangements arrangements for order-selection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/06—Scanning arrangements arrangements for order-selection
- G01J2003/062—Scanning arrangements arrangements for order-selection motor-driven
- G01J2003/063—Step motor
Abstract
The invention discloses an automatic focusing built-in push-broom hyperspectral imager, which comprises a hyperspectral imaging system, an automatic focusing system and a built-in push-broom system; the hyperspectral imager has the advantages that the hyperspectral focusing process is simplified and automated to a great extent, the focusing accuracy is improved, a pushing and sweeping system of the hyperspectral imager is optimized, a slit pushing and sweeping mode is adopted instead of a mode of pushing and sweeping together with an objective lens, the pushing and sweeping structure of the hyperspectral imager is simplified, a pushing and sweeping device is not required to be added externally, a single machine is placed to collect hyperspectral imaging data, the structure is compact, the weight is light, the transmission of a screw sliding table is stable, and the imaging quality is good.
Description
Technical Field
The invention relates to the technical field of hyperspectral imagers, in particular to an automatic focusing built-in push-broom hyperspectral imager.
Background
The hyperspectral camera can not only obtain the spatial distribution information of ground objects, but also synchronously obtain the spectral information of the ground objects for analyzing the material components, and plays an important role in the fields of agricultural pest detection, forestry tree species identification, water environment detection and the like. Most of the currently mainstream hyperspectral imaging systems are of a push-broom type, that is, spatial information and spectral information of one line of a spatial dimension are acquired by single photographing, so that a push-broom mechanism is required to realize global imaging. The hyperspectral systems can be divided into two types according to the form of realizing push-scanning, one type is that the hyperspectral camera moves to realize push-scanning, such as an unmanned aerial vehicle-mounted hyperspectral system and a hyperspectral system using a turntable and the like, and the other type is that the translation mechanism is used for driving a measured object to move relative to the hyperspectral camera to realize push-scanning, single imaging cannot acquire two-dimensional space information, and cannot judge whether focusing is accurate, a spectrometer needs to be continuously pushed and scanned or the measured object needs to be pushed and scanned in the process of focusing every time, the focusing accuracy is low, and the time consumption is long.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an automatic focusing built-in push-broom hyperspectral imager to solve the problems.
In order to achieve the purpose, the invention provides the following technical scheme: an automatic focusing built-in push-broom hyperspectral imager comprises a hyperspectral imaging system, an automatic focusing system and a built-in push-broom system;
the hyperspectral imaging system comprises a slit, a collimating lens group, a volume holographic grating, a focusing lens group and a detector, wherein the slit, the collimating lens group, the volume holographic grating, the focusing lens group and the detector are sequentially arranged along the direction of a light path;
the automatic focusing system comprises a focusing imaging lens group, a visible light detector, a built-in motor, a data processing driving module and a PC (personal computer), wherein the focusing imaging lens group is arranged on one side of the slit along the light path and away from the collimating lens group, the visible light detector is arranged below the light path of the collimating lens group, the built-in motor is arranged below the light path of the focusing imaging lens group, the data processing driving module is used for controlling the built-in motor to operate, and the PC is used for analyzing signals transmitted by the data processing driving module and feeding back the signals to the data processing driving module;
the built-in push-broom system comprises a sliding assembly and a driving device, the sliding assembly is arranged below the visible light detector, the driving device is connected with the sliding assembly, and the PC is further used for controlling the driving device to operate.
Preferably, drive arrangement includes step motor and mounting bracket, and step motor sets up in the one end of mounting bracket, and the mounting bracket is provided with the mounting groove that supplies the sliding component to place.
Preferably, the sliding assembly comprises a screw rod and a sliding table, the two ends of the screw rod are connected with the two ends of the mounting groove, and the screw rod is connected with the sliding table in a sliding mode.
Preferably, the built-in motor is a built-in AF motor.
Preferably, the data processing driving module comprises instrument parameters and a data acquisition module, and the data acquisition module is used for feeding back the acquired instrument parameters to the PC.
Preferably, the instrument parameters include frame rate, integration time, scan range.
Preferably, the frame rate is in the range of 1Hz to 50Hz.
Preferably, the integration time is in the range of 27. Mu.S-1S.
Based on the hyperspectral imager, the method comprises the following steps:
step 10: opening the device;
step 20: the visible light detector and the hyperspectral imaging system are fixed on the sliding assembly in a displacement mode, the distances of the visible light detector, the slit and the focusing imaging lens group in the axial direction are equal, and a worker clicks an automatic focusing option on a PC;
step 30: the data processing driving module judges the definition according to the image, controls the built-in motor to drive the focusing imaging lens group to carry out focusing until the focusing imaging lens group moves to the optimal focal plane, finishes automatic focusing and stops working;
step 40: the driving device drives the sliding assembly to move until the visible light detector moves to the focusing imaging lens group for imaging, and the driving device drives the sliding assembly to move again, so that the hyperspectral imaging system and the visible light detector are driven to start to push and sweep;
step 50: when the slit moves to the rear of the focusing imaging lens group, a detector of the hyperspectral imaging system starts imaging until imaging of a measured object is completed;
step 60: and the PC machine records data and closes the equipment.
Preferably, the focusing imaging lens group does not pass through the visible light detector during the push-scanning process.
The invention has the beneficial technical effects that: the hyperspectral imager has the advantages that the hyperspectral focusing process is simplified and automated to a great extent, the focusing accuracy is improved, a pushing and sweeping system of the hyperspectral imager is optimized, a slit pushing and sweeping mode is adopted instead of a mode of pushing and sweeping together with an objective lens, the pushing and sweeping structure of the hyperspectral imager is simplified, a pushing and sweeping device is not required to be added externally, a single machine is placed to collect hyperspectral imaging data, the structure is compact, the weight is light, the transmission of a screw sliding table is stable, and the imaging quality is good.
Drawings
FIG. 1 is a schematic diagram of an automatic focusing hyperspectral imager of the present invention;
FIG. 2 is a flow chart of the auto-focus hyperspectral imager of the present invention;
FIG. 3 is a schematic structural diagram of an auto-focusing system according to the present invention;
FIG. 4 is a schematic diagram of a data processing driver module according to the present invention;
fig. 5 is a schematic structural view of the sliding assembly of the present invention.
Reference numerals: 1. a hyperspectral imaging system; 11. a slit; 12. a collimating lens group; 13. a volume holographic grating; 14. a focusing lens group; 15. a detector; 2. an auto-focus system; 21. a focusing imaging lens group; 22. a visible light detector; 23. a built-in motor; 24. a data processing driving module; 241. an instrument parameter; 2411. frame frequency; 2412. an integration time; 2413. scanning the range; 242. a data acquisition module; 25. a PC machine; 3. a push-broom system is arranged in the device; 31. a drive device; 311. a stepping motor; 312. a mounting frame; 313. mounting grooves; 32. a sliding assembly; 321. a screw rod; 322. and a sliding table.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
In this embodiment:
referring to fig. 1-5, an automatic focusing built-in push-broom hyperspectral imager comprises a hyperspectral imaging system 1, an automatic focusing system 2 and a built-in push-broom system 3;
the hyperspectral imaging system 1 comprises a slit 11, a collimating mirror group 12, a volume holographic grating 13, a focusing mirror group 14 and a detector 15, wherein the slit 11, the collimating mirror group 12, the volume holographic grating 13, the focusing mirror group 14 and the detector 15 are sequentially arranged along the light path direction; when the light path passes through the slit 11, light with different wavelengths can be subjected to bend-scatter propagation in different degrees, then is subjected to diffraction light splitting through the collimating lens group 12 and the volume holographic grating 13 to form a band, and is irradiated onto the detector 15 through the focusing lens group 14, so that the position and the intensity of each pixel on the detector 15 represent the spectrum and the intensity, the collimation of the light path is maintained through the collimating lens group 12, the capability of edge light beams of the light path to enter the detector 15 is improved through the focusing lens group 14, and the light condensing effect on the light path is improved;
the automatic focusing system 2 comprises a focusing imaging lens group 21, a visible light detector 22, an internal motor 23, a data processing driving module 24 and a PC 25, the focusing imaging lens group 21 is arranged on one side of the slit 11 along the light path and away from the collimating lens group 12, the hyperspectral imager and the automatic focusing system 2 multiplex the same focusing imaging lens group 21, the distances of the visible light detector 22, the slit 11 and the focusing imaging lens group 21 along the axial direction are equal, the visible light detector 22 is arranged below the light path of the collimating lens group 12, the internal motor 23 is arranged below the light path of the focusing imaging lens group 21, the internal motor 23 is an internal AF motor, when the hyperspectral imager starts to operate, the data processing driving module 24 performs resolution judgment according to the image, the data processing driving module 24 controls the AF motor to drive the focusing imaging lens group 21 to perform focusing until the focusing is moved to the optimal focal plane, completing automatic focusing, stopping the work of the AF motor, wherein the data processing driving module 24 comprises instrument parameters 241 and a data acquisition module 242, the instrument parameters 241 comprise a frame frequency 2411, an integration time 2412 and a scanning range 2413, the data acquisition module 242 is used for feeding back the acquired frame frequency 2411, the integration time 2412 and the scanning range 2413 to the PC 25, wherein the frame frequency 2411 ranges from 1HZ to 50HZ, the integration time 2412 ranges from 27 muS to 1S, the scanning range 2413 comprises a transverse scanning range 2413 and a longitudinal scanning range, the transverse scanning range is not less than 0 and not more than 65 degrees, the longitudinal scanning range is 22 degrees, the PC 25 is used for analyzing signals transmitted by the data processing driving module 24 and feeding back the signals to the data processing driving module 24, and corresponding buttons are arranged on the PC 25 for the frame frequency 2411, the integration time 2412 and the scanning range 2413, when the light is weak, the integral time 2412 is increased, the scanning speed is reduced, the frame frequency 2411 is reduced, and the scanning range 2413 is selected by a worker according to the requirement;
the built-in push-broom system 3 comprises a sliding assembly 32 and a driving device 31, the driving device 31 comprises a stepping motor 311 and an installation frame 312, the stepping motor 311 is arranged at one end of the installation frame 312, the installation frame 312 is provided with an installation groove 313 for placing the sliding assembly 32, the sliding assembly 32 is arranged below the visible light detector 22, the sliding assembly 32 comprises a screw rod 321 and a sliding table 322, two ends of the screw rod are connected with two ends of the installation groove 313, one end of the screw rod extends to be clamped with a rotating shaft of the stepping motor 311, the screw rod 321 is connected with the sliding table 322 in a sliding manner, a sliding rail is arranged at the groove bottom of the installation groove 313, a supporting block is arranged at the bottom of the sliding table 322, a sliding block matched with the sliding rail is arranged at the bottom of the supporting block, the visible light detector 22 and the hyperspectral imaging system 1 are fixedly arranged on the sliding table 322, the stepping motor 311 drives the screw rod 321 to rotate, and the sliding table 322 is under the matching action between the self and the screw rod, the sliding table 322 starts moving on the screw to drive the hyperspectral imaging system 1 and the visible light detector 22 to start sweeping, when the slit 11 in the hyperspectral imaging system 1 moves to the rear of the focusing imaging lens group 21 of the auto-focusing system 2, the detector 15 in the hyperspectral imaging system 1 starts imaging, the staff completes the focusing operation of the focusing imaging lens group 21 through the PC 25, the sweeping imaging operation of the hyperspectral imaging system 1, the acquisition and storage operation of hyperspectral data, and the PC 25 to observe the focusing effect of the visible light detector 22 and the hyperspectral imaging system 1, and simultaneously, the visible light detector 22 and the slit 11 are installed and adjusted to the plane, the measured object is imaged by the same lens in turn, so that the hyperspectral imager also realizes the focusing operation after the focusing operation of the visible light detector 22 and the auto-focusing lens, the visible light detector 22 and the hyperspectral imaging system 1 are translated and swept back, so that hyperspectral data can be acquired; through with high spectrum imaging system 1, auto focus system 2, built-in push away sweep system 3 sets up in same casing, make simplifying and the automation of the very big degree of high spectrum focusing process, improve the accuracy of focusing, the push away sweep system to high spectrum imager has simultaneously been optimized, adopt slit 11 and visible light detector 22 to push away to sweep, but not the mode of pushing away the sweep together with objective, the push away of high spectrum imager is reduced and is swept the structure, need not external increase again and push away the sweep device, the unit is placed and can be carried out high spectrum imaging data acquisition, compact structure, light in weight, lead screw slip table 322 transmission is steady, imaging quality is good.
When in use, the preparation method comprises the following steps:
step 10: opening the device;
step 20: the visible light detector 22 and the hyperspectral imaging system 1 are fixed on the sliding table 322 in a displacement manner, the distances of the visible light detector 22, the slit 11 and the focusing imaging lens group 21 in the axial direction are equal, a worker clicks an automatic focusing option on the PC 25, the stepping motor 311 starts to rotate and drives the screw rod 321 to rotate, so that the sliding table 322 moves under the rotation of the screw rod 321, the visible light detector 22 and the hyperspectral imaging system 1 which are fixedly arranged on the sliding table 322 move until the visible light detector 22 moves to the focusing imaging lens group 21 for imaging;
step 30: the data processing driving module 24 judges the definition according to the image, if the focusing result can not meet the required requirement, the data processing driving module 24 controls the built-in AF motor to drive the focusing imaging lens group 21 to focus until the built-in AF motor moves to the optimal focal plane, the automatic focusing is completed, and the built-in AF motor stops working;
step 40: the stepping motor 311 drives the sliding assembly 32 to move again, so as to drive the hyperspectral imaging system 1 and the visible light detector 22 to start push-scanning;
step 50: when the slit 11 moves to the rear of the focusing imaging lens group 21, the detector 15 of the hyperspectral imaging system 1 starts imaging, the focusing imaging lens group 21 does not pass through the visible light detector 22 in the push-scan process until the imaging of the object to be detected is completed, and the stepping motor 311 stops operating again, so that the lead screw is not matched with the sliding table 322 to drive the sliding table 322 to move;
step 60: the PC 25 records the push-broom imaging operation of the data hyperspectral imaging system 1 and the acquisition and storage operation of the hyperspectral data, and simultaneously, the focusing effect of the visible light detector 22 and the hyperspectral imaging system 1 is observed through the PC 25, and the equipment is closed.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. The utility model provides an automatic built-in push-broom type hyperspectral imager of focusing which characterized in that: the hyperspectral imager comprises a hyperspectral imaging system (1), an automatic focusing system (2) and a built-in push-broom system (3);
the hyperspectral imaging system (1) comprises a slit (11), a collimating mirror group (12), a volume holographic grating (13), a focusing mirror group (14) and a detector (15), wherein the slit (11), the collimating mirror group (12), the volume holographic grating (13), the focusing mirror group (14) and the detector (15) are sequentially arranged along the light path direction;
the automatic focusing system (2) comprises a focusing imaging lens group (21), a visible light detector (22), a built-in motor (23), a data processing driving module (24) and a PC (25), wherein the focusing imaging lens group (21) is arranged on one side of the slit (11) along the light path direction and away from the collimating lens group (12), the visible light detector (22) is arranged below the light path of the collimating lens group (12), the built-in motor (23) is arranged below the light path of the focusing imaging lens group (21), the data processing driving module (24) is used for controlling the built-in motor (23) to operate, and the PC (25) is used for analyzing signals transmitted by the data processing driving module (24) and feeding back the signals to the data processing driving module (24);
the built-in push-broom system (3) comprises a sliding assembly (32) and a driving device (31), the sliding assembly (32) is arranged below the visible light detector (22), the driving device (31) is connected with the sliding assembly (32), and the PC (25) is further used for controlling the driving device (31) to operate.
2. The built-in push-and-sweep hyperspectral imager of auto-focus according to claim 1, characterized in that: drive arrangement (31) include step motor (311) and mounting bracket (312), step motor (311) set up in the one end of mounting bracket (312), mounting bracket (312) are provided with mounting groove (313) that supply sliding assembly (32) to place.
3. An auto-focusing built-in push-and-sweep hyperspectral imager as claimed in claims 1 and 2, wherein: the sliding assembly (32) comprises a screw rod (321) and a sliding table (322), two ends of the screw rod are connected with two ends of the mounting groove (313), and the screw rod (321) is connected with the sliding table (322) in a sliding mode.
4. The built-in push-and-sweep hyperspectral imager of auto-focus according to claim 1, characterized in that: the built-in motor (23) is a built-in AF motor.
5. The built-in push-broom hyperspectral imager of claim 1, which is auto-focusing, characterized in that: the data processing driving module (24) comprises instrument parameters (241) and a data acquisition module (242), wherein the data acquisition module (242) is used for feeding back the acquired instrument parameters (241) to the PC (25).
6. The auto-focusing built-in push-and-sweep hyperspectral imager of claim 5, wherein: the instrument parameters (241) include a frame rate (2411), an integration time (2412), and a scan range (2413).
7. The auto-focusing built-in push-and-sweep hyperspectral imager of claim 6, wherein: the frame frequency (2411) ranges from 1HZ to 50HZ.
8. The built-in push-and-sweep hyperspectral imager of auto-focus according to claim 1, characterized in that: the integration time (2412) is in the range of 27. Mu.S-1S.
9. The built-in push-broom hyperspectral imager of claim 1, which is auto-focusing, characterized in that: the method comprises the following steps:
step 10: opening the device;
step 20: the visible light detector (22) and the hyperspectral imaging system (1) are fixed on the sliding assembly (32) in a displacement mode, the distances of the visible light detector (22), the slit (11) and the focusing imaging lens group (21) along the axial direction are equal, and a worker clicks an automatic focusing option on the PC (25);
step 30: the data processing driving module (24) judges the definition according to the image, the data processing driving module (24) controls the built-in motor (23) to drive the focusing imaging lens group (21) to focus until the built-in motor moves to the optimal focal plane, automatic focusing is completed, and the built-in motor (23) stops working;
step 40: the driving device (31) drives the sliding assembly (32) to move until the visible light detector (22) moves to the focusing imaging lens group (21) for imaging, and the driving device (31) drives the sliding assembly (32) to move again, so that the hyperspectral imaging system (1) and the visible light detector (22) are driven to start to push and sweep;
step 50: when the slit (11) moves to the rear of the focusing imaging lens group (21), a detector (15) of the hyperspectral imaging system (1) starts imaging until imaging of a measured object is completed;
step 60: the PC (25) records data and shuts down the equipment.
10. The built-in push-broom hyperspectral imager of claim 9, wherein: the focusing imaging lens group (21) does not pass through the visible light detector (22) in the push-broom process.
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| CN202110934451.2A CN115326199A (en) | 2021-08-16 | 2021-08-16 | Built-in push-broom hyperspectral imager with automatic focusing function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115598075A (en) * | 2022-12-14 | 2023-01-13 | 自然资源部第二海洋研究所（Cn） | Deep sea hyperspectral imaging detection system and method based on two-channel coaxial light path |
| CN116593002A (en) * | 2023-07-18 | 2023-08-15 | 北京卓立汉光仪器有限公司 | Automatic focusing spectrometer |
-
2021
- 2021-08-16 CN CN202110934451.2A patent/CN115326199A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115598075A (en) * | 2022-12-14 | 2023-01-13 | 自然资源部第二海洋研究所（Cn） | Deep sea hyperspectral imaging detection system and method based on two-channel coaxial light path |
| CN116593002A (en) * | 2023-07-18 | 2023-08-15 | 北京卓立汉光仪器有限公司 | Automatic focusing spectrometer |
| CN116593002B (en) * | 2023-07-18 | 2023-09-12 | 北京卓立汉光仪器有限公司 | Automatic focusing spectrometer |
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