CN213581573U

CN213581573U - Compact structured light path

Info

Publication number: CN213581573U
Application number: CN202022882200.8U
Authority: CN
Inventors: 肖文; 郑远林; 沈晓伟; 汪俊
Original assignee: Ninth Peoples Hospital Shanghai Jiaotong University School of Medicine
Current assignee: Ninth Peoples Hospital Shanghai Jiaotong University School of Medicine
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-06-29
Anticipated expiration: 2030-12-04

Abstract

The utility model discloses a compact structure light path relates to the three-dimensional imaging field, including sensitization component, light source, barn door, first battery of lens, second battery of lens, third battery of lens, wherein, the barn door is set up first battery of lens with the centre of second battery of lens, the light source sets up keep away from barn door one side of first battery of lens, be provided with logical unthreaded hole in the middle of the barn door, sensitization component is set up logical unthreaded hole is close to light source one side, logical unthreaded hole with be provided with between the sensitization component third battery of lens. The utility model discloses and part light path device and measurement target object completely for the structured light path can become an equipment alone, simply and conveniently changes the grating in the structured light path according to the order fast simultaneously, has reduced to change the time interval of grating to formation of image.

Description

Compact structured light path

Technical Field

The utility model relates to a three-dimensional imaging field especially relates to a compact structure light path.

Background

Microscopes are commonly used in the field of observation of microscopic objects, such as microorganisms, microscopic particles, and the like. These microscopic objects are generally not suitable for observation under wide field conditions. Conventional kohler illumination techniques, which are widely used in optical microscopy, are therefore limited in micro-scale profilometry. To improve the resolution of wide-field microscopes, structured light illumination techniques were proposed in 2005 and have been widely studied and applied in recent years.

Structured light illumination is an illumination mode by changing the spatial structure of illumination light, and the illuminated structured light is a carrier frequency stripe, so that the illumination mode can be applied to measurement of angles, lengths, vibration and the like and is widely applied to three-dimensional imaging. The principle of realizing super resolution of the structured light illumination microscope is that a part of information outside an optical transfer function range is transferred to the range in the imaging process by using illumination light of a specific structure, and high-frequency information in the range is moved to an original position by using a specific algorithm, so that the frequency domain information of a sample passing through a microscope system is expanded, and the resolution of a reconstructed image exceeds the limit of a diffraction limit.

To achieve structured light illumination, a spatial light modulator, such as a grating, digital micromirror array, or the like, is typically inserted into the illumination light path. The unmodulated illumination light is modulated by the spatial light modulator and then projected on the sample through the objective lens, so that the illumination of the modulated light is received at the focal plane of the sample and is not influenced when the illumination light is far away from the focal plane. The light information generated by the final modulated light is received by the photosensitive element through the imaging system, and then the spatial domain and the frequency domain are changed through Fourier transform, so that an image is obtained.

Because structured light illumination needs to be emitted by a common light source, the light passes through a structured light grating and then irradiates on a measurement target object, and then a photosensitive element, such as a CCD (charge coupled device), is adopted to receive the structured light reflected by the measurement target object, so that image processing of three-dimensional imaging is carried out subsequently. In the prior art, the optical device and the measurement target object are arranged in a mixed manner, that is, the measurement target object is arranged in the middle of the optical device, so that the measurement target object cannot be separated from the structured light path, and the structured light path is not favorable for forming independent equipment.

In some applications, different structured lights are irradiated on the same measurement target object and imaging is performed multiple times. This requires replacement of the spatial modulator in the structured light path. In the prior art, taking a grating as an example, the grating is replaced in a structured light path, and imaging is performed after the grating is replaced each time, so that the steps are complicated, and the time is long. Especially, under the application that structured light imaging needs to be carried out for multiple times in sequence, the manual replacement of the grating consumes long time and is easy to make mistakes. And the replaced gratings also need to be stored in sequence for use next time, which is very inconvenient, and the gratings are easily damaged due to frequent replacement. The photosensitive element needs to be imaged after the grating is replaced every time, and the time interval from the completion of the replacement of the grating to the imaging is long, so that the time is wasted.

Therefore, those skilled in the art have made efforts to develop a more compact structured light path and completely separate the light path device from the object to be measured, so that the structured light path can be used as a single device, and simultaneously, the gratings in the structured light path can be replaced easily and rapidly in sequence, and the time interval from the replacement of the gratings to the imaging can be reduced.

SUMMERY OF THE UTILITY MODEL

In order to achieve the above object, the utility model provides a compact structure light path, a serial communication port, including photosensitive element, light source, barn door, first battery of lens, second battery of lens, third battery of lens, wherein, the barn door is set up first battery of lens with the centre of second battery of lens, the light source sets up keeping away from barn door one side of first battery of lens, be provided with logical unthreaded hole in the middle of the barn door, photosensitive element is set up logical unthreaded hole is close to light source one side, logical unthreaded hole with be provided with between the photosensitive element the third battery of lens.

Furthermore, a rectangular window is formed in the light barrier.

Further, the light through hole is circular.

Further, the light barrier is arranged to be a turntable type which can be rotated around the central shaft by the rotating device.

Further, the number of the rectangular windows can be set according to the specific length of the structured light sequence.

Further, the number of the rectangular windows is even.

Furthermore, the rectangular windows are symmetrically and equidistantly arranged on the light barrier, and the distances from the rectangular windows to the circle center are equal.

Furthermore, a grating is arranged on the rectangular window.

Further, the order of the gratings arranged in the rectangular window is set according to a specific order of the structured light sequence.

Further, the rectangular window is provided with plane glass.

The application has the following beneficial technical effects:

1. the application discloses structured light path sets up, can make the light path compacter to separate light path device and measurement target object completely, make structured light path can become an equipment alone.

2. The optical gratings in the structured light path can be replaced simply, conveniently and rapidly in sequence, and the replacement interval of the optical gratings is determined by the rotating speed of the turntable and the number of the rectangular windows.

3. The time interval from the grating replacement to the imaging is reduced by adopting the position sensor and the control circuit, and the shooting imaging can be completed within millisecond time, so that the whole time for forming the structured light sequence is greatly reduced.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.

Drawings

Fig. 1 is a schematic structural diagram of a compact structured light path according to a preferred embodiment of the present invention;

fig. 2 is a schematic diagram of a light barrier of a compact structured light path according to another preferred embodiment of the present invention.

Detailed Description

The technical contents of the preferred embodiments of the present invention will be more clearly understood and appreciated by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments, and the scope of the invention is not limited to the embodiments described herein.

In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.

Example one

As shown in fig. 1, the present application provides a compact structured light path. Including a light source and a light barrier. Rectangular windows are formed in the light barrier and used for installing the gratings. The light emitted by the light source irradiates the measuring target through a first lens group arranged between the light source and the light barrier, a rectangular window arranged on the light barrier and a second lens group arranged between the light barrier and the measuring target. As long as the grating is installed in the rectangular window, light irradiated onto the measurement target is spatially modulated to become structured light. The first lens group and the second lens group can be used for adjusting the emergent and incident angles of light rays so as to adjust the illumination effect. The middle position of the light barrier is provided with a light through hole, and the photosensitive element is arranged behind the light through hole. The light reflected from the measurement target passes through the light-passing hole and reaches the photosensitive element. And a third lens group is arranged between the light through hole and the photosensitive element and used for adjusting the angle of light reflected from the measurement target. In this embodiment, the light source and the photosensitive element are disposed on the same side of the light barrier. That is, one side of the light barrier is entirely a structured light path device, and the other side of the light barrier is a measurement target, so that the measurement target is completely independent of the structured light path. The structure of the structured light path is very compact, and the structured light path can be formed into independent equipment.

Example two

As shown in fig. 2, in this embodiment, the light barrier is preferably configured as a turntable, and a circular light hole is formed in the center of the turntable. The circumference of the rotating disk is symmetrically provided with 8 rectangular windows at equal intervals. The 8 rectangular windows are equidistant from the center of the turntable. The light source is arranged behind the disc, and the distance from the light source to the center of the rotary disc is equal to the distance from the 8 rectangular windows to the center of the rotary disc. The turntable is sleeved on a rotating mechanism and is driven by the rotating mechanism to rotate. In the process of rotating the turntable, when one rectangular window rotates to a position corresponding to the light source, light emitted by the light source can be emitted through the rectangular window. And at the same time, the light emitted by the light source can only be emitted through one rectangular window.

In the present embodiment, 8 windows are provided with gratings 1-8 having projection patterns 1-8, respectively. When the turntable rotates in a certain direction, the gratings 1-8 pass through the positions corresponding to the light source in sequence. The light emitted by the light source forms a structured light sequence when the structured light is sequentially projected on a measuring target after being modulated by the gratings 1-8. The order of the structured light sequence is determined by the order of the gratings arranged on the turntable, while being influenced by the direction of rotation of the turntable. In other embodiments, different structured light sequences may be set according to specific requirements of 3D imaging, and not only the number of rectangular windows on the turntable may be set according to the specific length of the structured light sequence. The order of the gratings arranged in the rectangular window may also be set according to the specific order of the structured light sequence, or the turning of the turntable may be adjusted. Meanwhile, in some rectangular windows, no grating or only plane glass may be arranged to play a role of not performing spatial light modulation. Therefore, by adopting the structured light path of the embodiment, the structured light sequence can be formed with extremely high efficiency through the rotation of the turntable, and the structured light sequence is not required to be realized through manually replacing the grating. And when the rotation period of the turntable is T and the set rectangular window is N, the time interval for replacing the grating is T/N. Even with the drive mechanism common in the prior art, replacement of the grating is easily accomplished within a time interval on the order of seconds. In addition, the used gratings do not need to be stored in sequence, so that the disassembling and assembling steps are saved, and the confusion is not easy.

For each exposure of the structured light, it is necessary to operate the photosensitive element to receive reflected light from the measurement target and record an image. Therefore, on the premise that the efficiency of replacing the grating is high, an imaging system with the same high efficiency is needed, and imaging is completed in the time interval of replacing two adjacent gratings.

In this embodiment, a position indication sheet is provided at the edge of the turntable. The position indication sheets are distributed on the circumference of the rotating disc at equal intervals, the total number of the position indication sheets is equal to the number of the rectangular windows on the rotating disc, and each position indication sheet is arranged at a position corresponding to the rectangular window. In the present embodiment, the number of rectangular windows is 8, and therefore 8 position indication pieces are provided accordingly.

In this embodiment, the photosensitive element is a CCD camera, and the CCD camera is connected to a control circuit, and the imaging time is controlled by the control circuit. And a position sensor is arranged at the edge of the turntable. Since the position indicating sheet is arranged on the circumference of the corresponding position of the rectangular window, when the position indicating sheet moves to the corresponding position of the position sensor, namely the position of the rectangular window aligned with the light source, the CCD is in the best time for shooting and imaging. When the position sensor identifies the position indication sheet, a signal can be given to the control circuit, and a shooting instruction is sent to the CCD camera through the control circuit. The response time of the position sensor can reach the order of milliseconds, and thus is sufficient to complete imaging before the next window is aligned with the CCD camera. The time for forming the sequence of structured light images is completely dependent on the rotational speed of the turntable. Even if a driving mechanism commonly used in the prior art is adopted, the shooting imaging of the whole structured light sequence can be completed within a few seconds, and the efficiency is greatly improved.

When a CCD camera takes many structured-light images, i.e. a long structured-light sequence is obtained, it is necessary to know which image is the earliest (i.e. the start of the sequence). Therefore, 1 of the 8 position indication pieces is set to be different from the other position indication pieces, and is taken as an initial position indication piece. For example, the initial position indication piece is set to be three times as large as the position indication piece. In other embodiments, the initial position indicator piece may be provided in other shapes, so long as the position sensor can identify the initial position indicator piece, so that the control circuit can determine the initial time of the structured light sequence.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the teachings of this invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. The utility model provides a compact structure light path which characterized in that, includes photosensitive element, light source, barn door, first battery of lens, second battery of lens, third battery of lens, wherein, the barn door is set up first battery of lens with the centre of second battery of lens, the light source sets up keep away from barn door one side of first battery of lens, be provided with logical unthreaded hole in the middle of the barn door, photosensitive element is set up logical unthreaded hole is close to light source one side, logical unthreaded hole with be provided with between the photosensitive element third battery of lens.

2. The compact structured light path of claim 1, wherein said light barrier has a rectangular window formed therein.

3. The compact structured light path of claim 1, wherein the light passing aperture is circular.

4. The compact structured light path of claim 1, wherein the light barrier is configured as a turntable rotatable about a central axis by a rotating device.

5. The compact structured light circuit of claim 2, wherein the number of rectangular windows is configurable based on a particular length of the structured light sequence.

6. The compact structured light path of claim 2, wherein the number of rectangular windows is an even number.

7. The compact structured light path of claim 2, wherein the rectangular windows are symmetrically and equally spaced on the light barrier, and the distances from the rectangular windows to the center of the circle are equal.

8. The compact structured light path of claim 2, wherein the rectangular window has a grating disposed thereon.

9. The compact structured light path of claim 8, wherein the order of the gratings arranged in the rectangular window is arranged in a specific order of the structured light sequence.

10. The compact structured light path of claim 2, wherein a flat glass is disposed on said rectangular window.