CN213022837U - Multi-mode double-channel imaging detection system based on galvanometer scanning - Google Patents
Multi-mode double-channel imaging detection system based on galvanometer scanning Download PDFInfo
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- CN213022837U CN213022837U CN202021114992.8U CN202021114992U CN213022837U CN 213022837 U CN213022837 U CN 213022837U CN 202021114992 U CN202021114992 U CN 202021114992U CN 213022837 U CN213022837 U CN 213022837U
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Abstract
The utility model discloses a multi-mode double-channel imaging detection system based on galvanometer scanning, which comprises a hyperspectral camera, a conjugate camera, a front imaging module, a scanning galvanometer and a beam splitter; the imaging of the front imaging module is divided into two channels by a beam splitter according to a splitting ratio, the two channels enter the hyperspectral camera and the conjugate camera respectively for dual-channel imaging, the image surfaces of the hyperspectral camera and the conjugate camera are conjugated, the front imaging module is shared, and a target can be quickly positioned and focused by observing the image position information and the definition of the conjugate camera; the hyperspectral camera uses a scanning galvanometer to scan and image a field of view; the working modes of the front-mounted imaging module comprise a macroscopic imaging mode, a microscopic imaging mode and an endoscopic imaging mode. The utility model can realize the rapid positioning and focusing of the target, avoid repeated push-broom imaging, and greatly improve the acquisition efficiency of hyperspectral data; and can work under multiple modes by changing the front imaging module.
Description
Technical Field
The utility model belongs to the technical field of optics, concretely relates to multi-mode binary channels formation of image detecting system based on mirror scanning shakes.
Background
Hyperspectral imaging combines spectroscopy and digital imaging technology, and has been widely applied to the fields of remote sensing, medicine, agriculture, food detection and the like. According to the working mode of hyperspectral imaging, point scanning, push scanning and staring imaging can be divided. The push-broom hyperspectral imaging technology has good compromise among spatial resolution, spectral resolution and acquisition time, and is a mature hyperspectral imaging technology at present. However, this system needs to be mounted on a macro moving part of the push-broom, which limits its imaging range and compact size. Furthermore, it is difficult to quickly locate and focus on the region of interest. The line spectrum image is focused mainly by the experience of an operator, and the imaging position is determined by frequently needing multiple push-and-scan imaging, which is time-consuming.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problem among the prior art, the utility model provides a multi-mode binary channels formation of image detecting system based on mirror scanning shakes.
A multi-mode dual-channel imaging detection system based on galvanometer scanning comprises a hyperspectral camera, a conjugate camera, a front imaging module, a scanning galvanometer and a beam splitter; the imaging of the front imaging module is divided into two channels by a beam splitter according to a splitting ratio, the two channels enter the hyperspectral camera and the conjugate camera respectively for dual-channel imaging, the image surfaces of the hyperspectral camera and the conjugate camera are conjugated, the front imaging module is shared, and a target can be quickly positioned and focused by observing the image position information and the definition of the conjugate camera; the hyperspectral camera uses a scanning galvanometer to scan and image a field of view; the working modes of the front-mounted imaging module comprise a macroscopic imaging mode, a microscopic imaging mode and an endoscopic imaging mode.
The image surfaces of the conjugate camera and the hyperspectral camera are conjugated, and an RGB camera, a gray-scale camera or a plenoptic camera is adopted.
The multi-mode dual-channel imaging detection system based on galvanometer scanning has the advantages that light incident to the scanning galvanometer is light on an object plane imaged by the front imaging module and is collimated into parallel light to be relayed to a slit of a hyperspectral camera, the relay image plane on the slit is moved up and down by changing the angle of the scanning galvanometer, and finally field-of-view scanning hyperspectral imaging is achieved.
The hyperspectral camera belongs to a line scanning hyperspectral camera and sequentially comprises a hyperspectral camera relay lens, a slit, a collimating lens, a prism-grating-prism pair, a focusing lens and a hyperspectral camera photosensitive chip.
The multi-mode double-channel imaging detection system based on galvanometer scanning is characterized in that during a macro imaging mode, the front imaging module consists of a camera lens and a front imaging relay lens, and an image plane of the camera lens is located on a focal plane of the front imaging relay lens.
The multi-mode dual-channel imaging detection system based on galvanometer scanning is characterized in that during a microscopic imaging mode, the front-mounted imaging module consists of a microscope objective and an electric adjustable lens, and the microscope objective is imaged on different focal planes through the electric adjustable lens.
The multi-mode dual-channel imaging detection system based on galvanometer scanning is characterized in that during an endoscopic imaging mode, the front imaging module consists of an endoscopic lens, an image transmission optical fiber and a microscope objective, and an image formed by the endoscopic lens is transmitted to an imaging surface of the microscope objective through the image transmission optical fiber to be amplified.
In the multi-mode dual-channel imaging detection system based on galvanometer scanning, the endoscope head can be replaced by a combination of a microscope objective and an electric adjustable lens, and a distance sensor, the electric adjustable lens and a microcomputer are utilized to realize the rapid focusing of a sample.
The multi-mode dual-channel imaging detection system based on galvanometer scanning can be used for penetrating into the human body or ocean sediment by using the endoscope head so as to realize in-situ detection of organisms in the human body or the ocean sediment; the in-situ microscopic detection of multiple environments such as ocean water bodies, seabed soil surfaces and the like can be realized by using the microscope objective.
Utility model's beneficial effect: the utility model discloses a beam splitter makes conjugate camera image planes and high spectral camera image planes conjugate, through image position information and the definition of observing the conjugate camera, can realize advancing line location fast and focusing to the target, has avoided pushing away repeatedly and has swept the formation of image, can greatly promote high spectral data's collection efficiency. And through changing leading imaging module, this system can work under the multiple mode of macroscopic imaging, microcosmic imaging and endoscopic imaging, has greatly widened the application scene of this system.
Drawings
FIG. 1 is a schematic diagram of a multi-mode dual-channel imaging detection system based on galvanometer scanning;
FIG. 2 is a schematic view of a micro-mode structure of a multi-mode dual-channel imaging detection system based on galvanometer scanning;
FIG. 3 is a schematic view of an endoscopic mode of the multi-mode dual-channel imaging detection system based on galvanometer scanning;
FIG. 4 is a hyperspectral image measured by a multi-mode dual-channel imaging detection system based on galvanometer scanning;
FIG. 5 is a spectrum of the hyperspectral image of FIG. 4;
in the figure, a camera lens 1, a front imaging relay lens 2, a beam splitter 3, a conjugate camera relay lens 4, a conjugate camera photosensitive chip 5, a scanning galvanometer 6, a hyperspectral camera relay lens 7, a slit 8, a collimating lens 9, a prism-grating-prism pair 10, a focusing lens 11, a hyperspectral camera photosensitive chip 12, a rapid microscopic imaging system 13, an endoscopic lens 14, an image transmission optical fiber 15 and a microobjective 16.
Detailed Description
The present invention will be explained with reference to the drawings and specific examples.
The utility model discloses the system has realized the scanning under staring at the state (no macroscopic motion part) through leading formation of image module, and work is in macroscopic imaging, microcosmic formation of image and peeps three kinds of modes of formation of image. Furthermore, the utility model discloses the system is equipped with a conjugate camera that is used for RGB/grey level formation of image, and it forms the binary channels formation of image with the same imaging lens of high spectrum camera sharing. By adjusting the imaging lens and observing the image on the conjugate camera, whether the interested selection and focusing of the imaging target are correct can be judged, and the selection and focusing target of the interested region can be determined without carrying out complete scanning processing and reconstruction on the hyperspectral image, so that rapid target selection and focusing are realized.
The front-end imaging module collimates an image surface after imaging, collimates light rays into parallel light, irradiates the parallel light onto a scanning galvanometer and relays the parallel light onto a slit of a hyperspectral camera, an image on the slit only passes through a linear region, the light in the linear region is collimated through a collimating lens and is incident on a prism-grating-prism pair for dispersion. Light in the line region is diffused by the prism-grating-prism pair, expanded in spectral size and focused on the photosensitive chip through the focusing lens. The system utilizes the scanning galvanometer to continuously change the angle of incident light, so that the image moves on a relay image surface (slit), which is equivalent to acquiring different line areas of the same image, thereby realizing scanning imaging in a staring state.
As shown in fig. 1, the front imaging module can be implemented by using a common camera lens 1 and a front imaging relay lens 2 in a macro imaging mode, and an image plane of the camera lens 1 is located on a focal plane of the front imaging relay lens 2. The multi-mode dual-channel imaging detection system based on galvanometer scanning comprises a camera lens 1, a front imaging relay lens 2, a beam splitter 3, a conjugate camera relay lens 4, a conjugate camera photosensitive chip 5, a scanning galvanometer 6, a hyperspectral camera relay lens 7, a slit 8, a collimating lens 9, a prism-grating-prism pair 10, a focusing lens 11 and a hyperspectral camera photosensitive chip 12.
As shown in fig. 2, the pre-imaging module can be implemented by a fast micro-imaging system 13, i.e. a micro-objective and an electrically tunable lens, in a micro-imaging mode; the imaging of the microscope objective on different focal planes can be realized through the electric adjustable lens.
As shown in fig. 3, the front imaging module can be implemented by using the endoscope head 14 in combination with the image transmission fiber 15 and the microscope objective 16 in the endoscopic mode. The image formed by the endoscope head 14 is transmitted to the imaging surface of the microscope objective 16 for amplification through the image transmission optical fiber 15, the endoscope head 14 can be replaced by the combination of the microscope objective and the electric adjustable lens, and the distance sensor, the electric adjustable lens and the microcomputer are utilized to realize the rapid focusing of the sample, thereby realizing the multi-environment detection of the ocean.
Application examples
In order to further explain the utility model discloses, adopted the utility model discloses a spectrum of human hand is surveyed to macroscopic mode. The human hand is irradiated by a light source or sunlight, and a control program of the system is compiled by Labview. The galvanometer needs voltage control, and output voltage is controlled through a USB-6356 data acquisition card of the national instruments company of America. The range of the determined starting voltage and the ending voltage, which are respectively the field scanning range, can be changed according to the requirement through experiments.
The front imaging module collimates the image surface of the hand of a human body after imaging, collimates light rays into parallel light, irradiates the parallel light onto the scanning galvanometer 6 and relays the parallel light onto a slit 8 of the hyperspectral camera, an image on the slit 8 only passes through a linear region, the light in the linear region is collimated through the collimating lens 9 and is incident on the prism-grating-prism 10 pair for dispersion. The light of the line region is dispersed by the prism-grating-prism pair 10, expanded in spectral size, and focused on the photosensitive chip 12 through the focusing lens 11. The system utilizes the galvanometer 6 to continuously change the angle of incident light, so that the image moves on a relay image surface (slit) 8, which is also equivalent to the collection of different line areas of the same image, thereby realizing scanning imaging in a staring state.
And observing an image on the conjugate camera 5, adjusting the position of the hand to enable the hand to enter an imaging range, and adjusting the imaging distance of the lens to enable the imaging to be clear. The voltage is continuously changed by a control program and a sequence of images is acquired.
And splicing the collected image sequences to obtain a three-dimensional hyperspectral cube of the hand of the human body, which is shot, as shown in figure 4. And the reflectivity spectra of both palm and finger regions were selected and plotted on fig. 5. From the figure, it can be seen that both have absorption peaks at 540 nm and 576 nm. In addition, there is an absorption peak around 420 nm, which is the characteristic absorption of the porphyrin compounds in the ultraviolet visible region in hemoglobin and other materials in the palm, called the Soret band, which is blue-shifted or red-shifted depending on the binding material.
Through the utility model provides a system can not need to carry out many times the high spectrum and push away to sweep the formation of image and confirm the formation of image scope, only can confirm formation of image scope and focus through the image of conjugate camera. And the scanning mode of the imaging spectrometer is changed from the traditional push-scanning type scanning based on a moving part into field scanning based on a galvanometer, thereby realizing staring imaging and ensuring that the whole system has a compact structure.
Claims (8)
1. The utility model provides a multimode binary channels formation of image detecting system based on galvanometer scanning which characterized in that: the hyperspectral imager comprises a hyperspectral camera, a conjugate camera, a front imaging module, a scanning galvanometer and a beam splitter; the beam splitter is used for dividing the image formed by the front imaging module into two channels according to the splitting ratio, and the two channels enter the hyperspectral camera and the conjugate camera respectively for dual-channel imaging; the image surfaces of the hyperspectral camera and the conjugate camera are conjugated and share the front-end imaging module, and the conjugate camera is used for quickly positioning and focusing a target; the hyperspectral camera uses a scanning galvanometer to scan and image a field of view; the front-end imaging module comprises a macro imaging mode, a micro imaging mode and an endoscopic imaging mode.
2. The galvanometer scanning based multi-mode dual channel imaging detection system of claim 1, wherein: the image surfaces of the conjugate camera and the hyperspectral camera are conjugated, and an RGB camera, a gray-scale camera or a plenoptic camera is adopted.
3. The galvanometer scanning based multi-mode dual channel imaging detection system of claim 1, wherein: the light incident to the scanning galvanometer is light on an object plane imaged by the front imaging module, is collimated into parallel light, is relayed to a slit of the hyperspectral camera, and by changing the angle of the scanning galvanometer, the relay image plane on the slit moves up and down, and finally the field-of-view scanning hyperspectral imaging is achieved.
4. The galvanometer scanning based multi-mode dual channel imaging detection system of claim 1, wherein: the hyperspectral camera belongs to a line scanning hyperspectral camera and sequentially comprises a hyperspectral camera relay lens, a slit, a collimating lens, a prism-grating-prism pair, a focusing lens and a hyperspectral camera photosensitive chip.
5. The galvanometer scanning based multi-mode dual channel imaging detection system of claim 1, wherein: and in the macro imaging mode, the front imaging module consists of a camera lens and a front imaging relay lens, and the image plane of the camera lens is positioned on the focal plane of the front imaging relay lens.
6. The galvanometer scanning based multi-mode dual channel imaging detection system of claim 1, wherein: and in the microscopic imaging mode, the front imaging module consists of a microscope objective and an electric adjustable lens, and the microscope objective is imaged on different focal planes through the electric adjustable lens.
7. The galvanometer scanning based multi-mode dual channel imaging detection system of claim 1, wherein: in the endoscopic imaging mode, the front imaging module consists of an endoscopic lens, an image transmission optical fiber and a microscope objective, and an image formed by the endoscopic lens is transmitted to an imaging surface of the microscope objective through the image transmission optical fiber for amplification.
8. The galvanometer scanning based multi-mode dual channel imaging detection system of claim 1, wherein: the endoscope head is a combination of a microscope objective and an electric adjustable lens, and utilizes a distance sensor, the electric adjustable lens and a microcomputer to realize the rapid focusing of a sample.
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