CN213633987U - Optical fiber scanning imaging device - Google Patents

Abstract

The utility model discloses an optical fiber scanning image device, include: the Y-fiber contains two completely separate fibers inside. The light emitted by the light source is input through one end of the Y-shaped optical fiber, the corresponding other end of the optical fiber is fixed in the second piezoelectric ceramic tube, the second piezoelectric ceramic tube drives the optical fiber to form scanning motion under the driving action of the piezoelectric ceramic, the light emitted by the light source and transmitted through the optical fiber is projected onto a target to be imaged, and the formed reflected light is collected through the other independent optical fiber of the Y-shaped optical fiber. And the other end of the optical fiber corresponding to the receiving optical fiber is driven by the same first piezoelectric ceramic tube to scan, and the optical plane scanned and output by the optical fiber is imaged through the photoelectric detection unit, so that an image of a target to be imaged is obtained. The synchronous scanning of the transmitting optical fiber and the receiving optical fiber can automatically realize the synchronization of object space and image space, and improve the imaging speed. And the complexity of the system is reduced without synthesizing three-color light. The method can be used for autofluorescence imaging through simple modification.

Description

Optical fiber scanning imaging device

Technical Field

The utility model relates to a scanning imaging technical field, concretely relates to optic fibre scanning imaging device can be used to endoscope imaging system.

Background

The traditional fiber endoscope adopts fiber bundles for image transmission, each fiber can only transmit one pixel, and therefore the number of the fiber bundles determines the imaging resolution. High resolution images also represent larger endoscope diameters. The optical fiber scanning endoscope adopts a single optical fiber scanning imaging mode, and becomes the technical direction of the next generation endoscope with the advantage of ultra-small diameter. However, in the existing optical fiber scanning technology, the receiving end of the optical fiber scanning technology adopts a fixed receiving mode and performs measurement through a conventional Photodiode (PD) or an Avalanche Photodiode (APD), and the PD or the APD only has a temporal resolution but lacks a spatial resolution, so that a complex software and hardware synchronization technology is required to perform final data processing for imaging (publication No. CN104936504A [0051]), which is prone to image distortion and may cause an image frame rate to be very low, possibly lower than 15 frames/second. Meanwhile, the method has higher requirement on the motion control precision of the optical fiber scanning, needs to introduce closed-loop feedback for control, and has more complex system (publication number: US9872606B 2). Secondly, if color light imaging is required, three colors of light are required to be combined at the input end of the emitted light, and a light splitting sheet and a plurality of photoelectric receiving elements (publication numbers: CN110794574A [0043], CN110850588A [0045]) are also required to be adopted at the corresponding receiving end, so that the hardware and software processing of the system are extremely complicated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to adopt simple signal acquisition and processing system, directly form images at light transmission unit output end face through area array imaging unit to improve the formation of image frame rate of endoscope. For color imaging, ordinary white light can be used as input, and three-color light synthesis is not needed. When monochromatic laser light is used as excitation light, the device can also be used for autofluorescence imaging.

The utility model adopts the technical proposal that: an optical fiber scanning imaging device comprising: the device comprises a data processing unit 1, a piezoelectric ceramic drive 2, a transmission line 3, a photoelectric detection unit 4, a first piezoelectric ceramic tube 5, a light source 6, an optical fiber 7, a fixed base 8, a Y-shaped optical fiber 9, a cable 10, a protective sleeve 11, a receiving optical fiber 12, a second piezoelectric ceramic tube 13, a transmitting optical fiber 14, an objective lens 15 and an object 16 to be imaged, wherein the Y-shaped optical fiber 9 comprises two completely independent optical fibers, light emitted by the light source 6 is input through one end of the Y-shaped optical fiber 9, the corresponding other end of the optical fiber is fixed in the second piezoelectric ceramic tube 13, the latter drives the transmitting optical fiber 14 to form scanning motion under the action of the piezoelectric ceramic drive 2, light transmitted through the optical fiber and emitted by the light source 6 is projected onto the object 16 to be imaged, the formed reflected light is collected through the other independent receiving optical fiber 12 of the Y-shaped optical fiber 9, the other end of the optical fiber 7 corresponding to the receiving optical fiber 12 is driven by the same first, the optical plane scanned and output by the optical fiber 7 is imaged by the photoelectric detection unit 4, so as to obtain the image of the target 16 to be imaged, wherein the target 16 to be imaged is the object to be directly measured, the objective lens 15 can focus the laser coupled from the other end of the emission optical fiber 14 located in the Y-shaped optical fiber 9 onto the target 16 to be imaged, the spatial distance between the objective lens 15 and the target 16 to be imaged depends on the selected focal length of the objective lens 15, the emission optical fiber 14 passes through the second piezoelectric ceramic tube 13, the right end of the emission optical fiber is suspended for about a few millimeters, the two ends of the emission optical fiber 14, which are in contact with the second piezoelectric ceramic tube 13, can be adhered and fixed by optical cement or ultraviolet cement, the same adhesion manner can be adopted between the optical fiber 7 and the first piezoelectric ceramic tube 5, the emission optical fiber 14 is used for transmitting light, which is emitted to the target 16 to be imaged, a part of which is reflected back to the receiving optical fiber, the receiving optical fiber 12 can collect the reflected light and transmit the light to the optical fiber 7 at the other end of the corresponding optical fiber, the piezoelectric ceramic drive 2 can output two paths of sinusoidal modulation voltage, the phase difference is a fixed angle, the first piezoelectric ceramic tube 5 and the second piezoelectric ceramic tube 13 are the same ceramic tube with four zone polarization, one end of the first piezoelectric ceramic tube and the second piezoelectric ceramic tube is fixed on the fixed base 8, the other end is in a free suspension state, the two paths of voltage output by the piezoelectric ceramic drive 2 are respectively connected to the two piezoelectric ceramic tubes in the same way through the cable 10, the suspended end of the piezoelectric ceramic tube can be driven to do spiral line or row and column scanning regular motion, the piezoelectric ceramic tube drives the optical fiber 7 and the tail end of the transmitting optical fiber 14 to move, the protective sleeve 11 is used for packaging the second piezoelectric ceramic tube 13 and the receiving optical fiber 12 to protect the second piezoelectric ceramic tube and the receiving optical fiber 12 from liquid, the light output by the photoelectric detection unit is transmitted to a target 16 to be imaged through an optical fiber to play a role in illumination, the Y-shaped optical fiber 9 is used as a carrier of an internal optical fiber to play a role in protection, the photoelectric detection unit 4 drives the optical fiber scanning plane 17 to be imaged through the first piezoelectric ceramic and transmits the imaged image to the data processing unit 1 through the transmission line 3, and the data processing unit can process the collected data to obtain a color image, a fluorescence image or a superposed image of the color image and the fluorescence image and present the superposed image to a user.

Further, the data processing unit 1 may be selected as a computer; the piezoelectric ceramic drive 2 can be selected as a signal generator; the transmission line 3 can be selected as a network cable; the photodetecting unit 4 may be selected as a CMOS camera.

The utility model discloses the principle lies in: as described in the background description, the prior art adopts a common photodetector as a signal receiving unit, lacks spatial resolution of an image plane, and needs to synchronize an acquired signal and a scanning position and perform more complex data processing in order to obtain a two-dimensional image. The utility model discloses the novelty adopts two identical piezoceramics pipes at transmission scanning end and receiving scanning end to adopt same scanning control signal. The receiving end adopts a detection device with spatial resolution, typically CMOS, CCD, photodiode array and the like, and can automatically realize the synchronization of the scanning position and the signal acquisition position. The image acquisition speed depends only on the frame rate of the photoelectric receiving device, such as a CMOS camera, and the scanning speed of the piezoelectric ceramic tube, but both the CMOS camera and the piezoelectric ceramic can reach extremely high frequency, so that the frame rate of the whole system can be expected to be greatly improved. Further, current colored CMOS or CCD camera has the function of automatic acquisition three-colour, so the utility model discloses the difference can realize colored formation of image automatically with preceding technique.

Compared with the prior art, the utility model has following several big technical advantages:

firstly, synchronous scanning of the transmitting optical fiber and the receiving optical fiber can automatically realize object space and image space synchronization, and additional software programming is not needed for data processing, so that the imaging speed of the system can be improved.

Secondly, since it is only necessary to ensure that the transmitting and receiving fibers have the same scanning pattern, there is no need to form the helical scanning required in the patent (publication No. US9872606B2) or the row-column scanning pattern shown in the patent (publication No. CN110850588A paragraph [0045 ]).

Thirdly, the detection unit in the embodiment, such as a CMOS camera, has an automatic color function, RGB three color lights do not need to be collected separately, the emission light source is only a common white light, and synthesis of three color lights is not needed, which reduces the complexity of the system.

Fourthly, the system can be used for the autofluorescence imaging in the second embodiment through simple modification.

Drawings

Fig. 1 is a schematic structural diagram of an optical fiber scanning imaging device according to the present invention;

the reference numbers in the figures mean:

1: a data processing unit, typically a computer; 2: a piezoelectric ceramic drive, typically a signal generator;

3: a transmission line, typically a network cable; 4: a photodetecting unit, typically a CMOS camera;

5: a first piezoelectric ceramic tube; 6: a light source;

7: an optical fiber; 8: a fixed base;

9: a Y-shaped optical fiber; 10: a cable;

11: protecting the sleeve; 12: receiving an optical fiber;

13: a second piezoelectric ceramic tube; 14: an emission optical fiber;

15: an objective lens; 16: the object to be imaged.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description.

As shown in fig. 1, the present invention relates to an optical fiber scanning imaging device, which comprises the following units:

a data processing unit 1, typically a computer; a piezoelectric ceramic drive 2, typically a signal generator; a transmission line 3, typically a network cable; a photodetecting unit 4, typically a CMOS camera; a first piezoelectric ceramic tube 5; a light source 6; an optical fiber 7; a fixed base 8; a Y-shaped optical fiber 9; a cable 10; a protective sleeve 11; a receiving optical fiber 12; a second piezoelectric ceramic tube 13; a transmitting optical fiber 14; an objective lens 15; the object 16 to be imaged.

The Y-fiber 9 of the present invention contains two completely independent fibers therein. Light emitted by the light source 6 is input through one end of the Y-shaped optical fiber 9, the other corresponding end of the Y-shaped optical fiber is fixed in the piezoelectric ceramic tube 13, the piezoelectric ceramic tube drives the transmitting optical fiber 14 to form scanning motion under the action of the piezoelectric ceramic drive 2, correspondingly, the light emitted by the light source 6 and transmitted through the optical fiber is projected onto a target 16 to be imaged, and formed reflected light is collected through the other independent receiving optical fiber 12 of the Y-shaped optical fiber 9. The other end of the optical fiber 7 corresponding to the receiving optical fiber 12 is driven by the same piezoelectric ceramic tube 5 to scan, and the optical plane scanned and output by the optical fiber 7 is imaged through the photoelectric detection unit 4, so that an image of the target 16 to be imaged is obtained.

The first embodiment is as follows: and (4) color endoscopic imaging.

The utility model discloses can be used to colored optic fibre endoscope formation of image, light source 6 shown in figure 1 adopts the white light source, and the optical coupling of its output is to 9 one ends inputs of Y type optic fibre, and used Y type optic fibre is typical for the multimode optic fibre of 50um-200um of twin-core diameter. The input light is emitted through the emission optical fiber 14 and reflected on the object 16 to be imaged, the reflected light is imaged on the photodetection unit 4 through the collection optical fiber 7, and the photodetection unit 4 employs a high-speed color area array CMOS camera in order to form a color image. The emission optical fiber 14 and the collection optical fiber 7 are driven by the first piezoelectric ceramic tube 5 and the second piezoelectric ceramic tube 13 with the same parameters to perform resonance motion. In order to reduce the diameter of the optical fiber probe, the first piezoceramic tube 5 and the second piezoceramic tube 13 are selected from the piezoceramic tubes made of PZT5A1 and manufactured by Morgan ceramics of Germany, and the inner diameter of the ceramic tubes is 0.3mm and the outer diameter of the ceramic tubes is 0.5 mm. After being packaged by the protective sleeve 11, the diameter of the fiber endoscope probe can be typically less than 1 mm. The first and second piezoelectric ceramic tubes 5 and 13 are characterized in that they are plated with metal electrodes on their inner and outer surfaces, and the inner surface electrode is used as a reference, the outer surface electrode is divided and polarized, and enameled wires having a typical diameter of about 0.1mm are welded to the divided electrodes. The enameled wire needs to be connected to the piezoelectric ceramic driver 2, in this application, the driving current needed by the piezoelectric ceramic tube is small, a signal generator can be directly adopted as a substitute, a typical SDG5082 signal generator of SIGLENT company is adopted, and similar products with the function of the signal generator can be adopted, and the model is not limited to the above.

The second embodiment: and (4) performing fluorescence endoscope imaging.

The utility model discloses a can be used to fluorescence endoscope formation of image equally, and is similar with the system in the embodiment one, and the difference mainly lies in, and the light source 6 as shown in figure 1 adopts monochromatic laser light source, and typical wavelength is as the near infrared laser of 785 nm. The Y-shaped optical fiber 9 is low-hydroxyl low-autofluorescence optical fiber or hollow optical fiber. The photodetection unit 4 employs a high-speed fluorescence imaging CMOS camera, typically usable for near-infrared imaging cameras around a wavelength of 825 nm.

Claims (2)

1. An optical fiber scanning imaging device, characterized in that: the method comprises the following steps: the device comprises a data processing unit (1), a piezoelectric ceramic drive (2), a transmission line (3), a photoelectric detection unit (4), a first piezoelectric ceramic tube (5), a light source (6), an optical fiber (7), a fixed base (8), a Y-shaped optical fiber (9), a cable (10), a protective sleeve (11), a receiving optical fiber (12), a second piezoelectric ceramic tube (13), a transmitting optical fiber (14), an objective lens (15) and an object (16) to be imaged, wherein the Y-shaped optical fiber (9) internally comprises two completely independent optical fibers, light emitted by the light source (6) is input through one end of the Y-shaped optical fiber (9), the corresponding other end of the Y-shaped optical fiber is fixed in the second piezoelectric ceramic tube (13), and the optical fiber drives the transmitting optical fiber (14) to form scanning motion under the action of the piezoelectric ceramic drive (2), and light emitted by the light source (6) and transmitted through the optical fiber is projected onto the object (16) to be imaged, the formed reflected light is collected through another independent receiving optical fiber (12) of the Y-shaped optical fiber (9), the other end optical fiber (7) corresponding to the receiving optical fiber (12) is driven by the same first piezoelectric ceramic tube (5) to scan, an optical plane scanned and output by the optical fiber (7) is imaged through the photoelectric detection unit (4), so that an image of a target (16) to be imaged is obtained, wherein the target (16) to be imaged is an object to be directly measured by the device, the objective lens (15) can focus laser coupled in by the emitting optical fiber (14) from the other end of the emitting optical fiber (14) positioned in the Y-shaped optical fiber (9) onto the target (16) to be imaged, the space distance between the objective lens (15) and the target (16) to be imaged depends on the focal length of the selected objective lens (15), the emitting optical fiber (14) passes through the second piezoelectric ceramic tube (13), and the right end of the emitting optical fiber is suspended in a few millimeters, the two ends of the transmitting optical fiber (14) which are contacted with the second piezoelectric ceramic tube (13) are bonded and fixed in an optical cement or ultraviolet cement mode, the same bonding mode is adopted between the optical fiber (7) and the first piezoelectric ceramic tube (5), the transmitting optical fiber (14) is used for transmitting light, the light is transmitted to a target (16) to be imaged, one part of the light is reflected back to the receiving optical fiber (12), the receiving optical fiber (12) can collect the reflected light and transmit the light to the optical fiber (7) at the other end of the corresponding optical fiber, the piezoelectric ceramic drive (2) can output two paths of sine modulation voltages, the phase difference of the sine modulation voltages is fixed at a fixed angle, the first piezoelectric ceramic tube (5) and the second piezoelectric ceramic tube (13) are the same ceramic tube with four subarea polarizations, one end of the first piezoelectric ceramic tube is fixed on the fixed base (8), the other end of the first piezoelectric ceramic tube is in a free suspension state, and the two paths of voltages output by the piezoelectric ceramic drive (2) are respectively connected to the On the electric ceramic tube, the suspended end of the piezoelectric ceramic tube can be driven to do spiral line or row-column scanning regular motion, the piezoelectric ceramic tube drives the optical fiber (7) and the tail end of the transmitting optical fiber (14) to move, the protective sleeve (11) is used for packaging the second piezoelectric ceramic tube (13) and the receiving optical fiber (12) to protect the second piezoelectric ceramic tube from being damaged by liquid in the environment, the light source (6) can output white light or monochromatic laser, the output light is conducted to a target (16) to be imaged through the optical fiber to play a role in illumination, the Y-shaped optical fiber (9) is used as a carrier of the internal optical fiber to play a role in protection, the photoelectric detection unit (4) images the optical fiber scanning plane (17) driven by the first piezoelectric ceramic tube and transmits the images to the data processing unit (1) through the transmission line (3), and the collected data can be processed to obtain a color image, a fluorescent image or a superposed image of, and presented to the user.

2. An optical fiber scanning imaging device according to claim 1, characterized in that: the data processing unit (1) is selected as a computer; the piezoelectric ceramic drive (2) is selected as a signal generator; the transmission line (3) is selected as a network cable; the photoelectric detection unit (4) is selected to be a CMOS camera.

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