Optical interference pattern capturing device
By using an optical interference pattern imaging device, the problem of the inability of optical sensors to perform three-dimensional angle adjustment in intraocular pressure detection is solved by adjusting the angle of the imaging element, thus realizing portable and efficient intraocular pressure detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- MINGCHE BIOTECHNOLOGY CO LTD
- Filing Date
- 2025-04-23
- Publication Date
- 2026-07-07
AI Technical Summary
Existing optically based miniature pressure sensors cannot perform three-dimensional angle adjustments when detecting intraocular pressure, which limits their applications.
An optical interference pattern imaging device was designed. By introducing an imaging module compatible with existing imaging elements, the angle of the imaging elements can be adjusted to meet the requirements of the incident light angle, thereby realizing the detection of intraocular pressure.
It enables portable, efficient and easy-to-use intraocular pressure detection, reduces the difficulty of angle adjustment, and improves the convenience and efficiency of detection.
Smart Images
Figure CN224461679U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to an optical interference pattern imaging device. Background Technology
[0002] Glaucoma is one of the three leading causes of blindness and poses a significant threat to human health. High intraocular pressure is considered a major risk factor for glaucoma; therefore, intraocular pressure is an important indicator in clinical practice for determining glaucoma treatment goals and assessing treatment effectiveness and prognosis.
[0003] Currently, the main method for measuring intraocular pressure (IOP) is through instruments that measure the patient's IOP in real time. These instruments primarily include applanation tonometers and aero-jet tonometers. Applanation tonometers, however, are complex and have drawbacks such as requiring topical anesthesia before measurement, needing to instill fluorescein sodium into the cornea during measurement, and the measurement being affected by the central corneal thickness. Aero-jet tonometers, compared to applanation tonometers, simplify the measurement process and do not require topical anesthesia or fluorescein sodium. However, aero-jet tonometers also have several drawbacks, including the impact of the airflow causing eye discomfort, high cost, and inconvenience.
[0004] In addition, there are many studies on miniature implantable intraocular pressure sensors based on different principles. These studies share the following characteristics: 1. The sensor is separate from the detection device, and the sensing method is non-contact; 2. The sensor area and volume are tiny, ranging from hundreds of micrometers to a few millimeters; 3. The sensor is in contact with the eye structure, either attached to the eyeball or implanted inside the eyeball.
[0005] These implantable intraocular pressure (IOP) sensors, classified according to their sensing principles, mainly fall into three categories: electro-sensing, microfluidic sensing, and optical sensing. Chen et al. designed an IOP sensor based on capacitance sensitivity to pressure, using a contact lens as a carrier. The frequency of an LC oscillator formed by capacitance and inductance changes with pressure, and the reading device is a large network analyzer. Agaoglu et al. used a microfluidic chip to achieve IOP detection. An artificial lens integrating the microfluidic chip was implanted into the eyeball using cataract surgery. As IOP fluctuates, the liquid-gas interface of the artificial lens shifts, and the IOP value is obtained by monitoring this interface position. Electro-sensing is limited by circuit structure and materials, making it difficult to achieve sub-millimeter sizes, and the reading devices are large and expensive. Microfluidic sensing faces bottlenecks in miniaturization due to stringent requirements for airtightness and the indirect sensing principle of image reading. Optical sensors, on the other hand, are generally smaller than electro-sensors and microfluidic sensors, thus becoming a major research direction for implantable sensors.
[0006] Existing optically based miniature pressure sensors typically rely on desktop microscopes to capture optical interference patterns. During the detection process, only three-axis adjustments (x, y, z) can be made, and three-dimensional angle adjustments are not possible. This fails to meet the high dependence of optical interference pattern capture on the incident angle of light, thus limiting its application. Utility Model Content
[0007] To address the problem that existing optical pressure sensors cannot perform three-dimensional angle adjustments during intraocular pressure detection, this invention provides an optical interference pattern imaging device. This device employs an imaging module compatible with existing imaging elements. During the detection process, the angle of the imaging element is adjusted to ensure that the incident angle of light meets the requirements for capturing optical interference patterns, thus solving the problem that existing optical pressure sensors cannot perform three-dimensional angle adjustments during intraocular pressure detection.
[0008] The technical solution adopted by this utility model to solve its technical problem is:
[0009] An optical interference pattern imaging device includes an imaging module and an imaging element; wherein,
[0010] The imaging module includes a housing, an optical path assembly disposed inside the housing, and a light source disposed outside the housing;
[0011] The housing is provided with a camera hole;
[0012] The imaging element includes a lens;
[0013] The imaging aperture is adapted to cooperate with the lens to obtain an interference pattern through the imaging element.
[0014] Optionally, the optical path assembly includes a beam-splitting cube and a plano-convex lens sequentially disposed in the imaging aperture.
[0015] Optionally, the optical path assembly further includes a narrowband filter disposed between the light source and the beam splitter cube.
[0016] Optionally, the narrowband filter is a 633nm narrowband filter.
[0017] Optionally, the operating wavelength range of the spectral cube is 450–650 nm.
[0018] Optionally, the plano-convex lens is designed with a wavelength of 350-700nm and a focal length of 20mm.
[0019] Optionally, the imaging element is a mobile phone; the mobile phone is equipped with a CMOS image sensor.
[0020] Optionally, the shooting module further includes a clamp; one end of the clamp is connected to the shooting element, and the other end is connected to the housing.
[0021] Optionally, the clamp includes a C-shaped element and a threaded connector; the C-shaped element is connected to the housing; the C-shaped element is connected to the imaging element via the threaded connector.
[0022] Optionally, the C-shaped element is provided with a mounting groove that is adapted to the housing.
[0023] The beneficial effects of this utility model are:
[0024] The optical interference pattern imaging device provided by this utility model introduces an imaging module that is compatible with existing imaging elements, so that intraocular pressure can be detected with the help of existing imaging elements. Furthermore, during the detection process, the position of the imaging module and the imaging element can be flexibly adjusted according to the position of the Fabry-Perot microcavity in the intraocular pressure sensor, so that the incident beam meets the requirement of perpendicular incidence, thereby greatly reducing the difficulty of angle adjustment during intraocular pressure detection, making it more portable, efficient and easy to use. Attached Figure Description
[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0026] Figure 1 This is a simplified structural diagram of the optical interference pattern imaging device in this utility model;
[0027] Figure 2 This is an exploded view of the imaging module in this utility model;
[0028] Figure 3 This is a simplified structural diagram of the optical path component in this utility model;
[0029] Figure 4 This is a schematic diagram illustrating the effect of the shooting angle on the integrity of the optical interference pattern in this utility model.
[0030] In the diagram: 1-Imaging module; 11-Housing; 111-Imaging hole; 12-Optical path assembly; 121-Beam splitter cube; 122-Planar-convex lens; 123-Narrow band filter; 13-Light source; 14-Clamp; 141-C-shaped element; 1411-Mounting slot; 1412-Through hole; 142-Threaded connector; 2-Imaging element; 21-Lens. Detailed Implementation
[0031] The present invention will now be described in further detail. The embodiments described below are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0032] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0033] To address the limitation of existing optical pressure sensors in detecting intraocular pressure in terms of their inability to perform three-dimensional angle adjustments, this invention provides an optical interference pattern imaging device. (See attached image.) Figure 1 As shown, the shooting device includes a shooting module 1 and a shooting element 2; wherein, see Figure 2 As shown, the imaging module 1 includes a housing 11, preferably made of polylactic acid (PLA) material and fabricated by extrusion 3D printing process; an optical path assembly 12 disposed inside the housing 11 and a light source 13 disposed outside the housing 11; an imaging hole 111 is provided on the housing 11; the imaging element 2 includes a lens 21; the imaging hole 111 is adapted to cooperate with the lens 21 to obtain an interference pattern through the imaging element 2.
[0034] The preferred light source 13 of this invention is a white light source.
[0035] The optical interference pattern imaging device provided by this invention is used in conjunction with a light-sensing pressure sensor, especially a MEMS intraocular pressure sensor, to capture the interference pattern generated on the pressure sensor during pressure detection, thereby enabling pressure detection.
[0036] When the pressure sensor is an intraocular pressure sensor, during use, the intraocular pressure sensor is implanted in the anterior chamber of the eye. The outer surface of the Fabry-Perot microcavity is in contact with the intraocular fluid to sense changes in intraocular pressure. During operation, the light emitted by the light source 13 passes through the optical path assembly 12 and is perpendicularly incident on the corresponding Fabry-Perot microcavity of the intraocular pressure sensor, i.e., the FP resonant cavity. After entering the cavity of the Fabry-Perot microcavity, it is reflected by multiple surfaces and interferes to obtain an interference pattern. The obtained interference pattern is then transmitted to the lens 21 of the imaging element 2 after passing through the optical path assembly 12. The interference pattern can be captured in real time by taking a picture through the imaging element 2, and the real-time intraocular pressure can be obtained based on the real-time captured interference pattern.
[0037] The optical interference pattern imaging device provided by this utility model introduces an imaging module 1 that is compatible with the existing imaging element 2, so that intraocular pressure can be detected with the help of the existing imaging element 2. Furthermore, during the detection process, the positions of the imaging module 1 and the imaging element 2 can be flexibly adjusted according to the position of the Fabry-Perot microcavity in the intraocular pressure sensor, so that the incident beam meets the requirement of perpendicular incidence, thereby greatly reducing the difficulty of angle adjustment during intraocular pressure detection, making it more portable, efficient and easy to use.
[0038] To measure intraocular pressure, see [link to relevant documentation]. Figure 3 As shown, the preferred optical path assembly 12 of this utility model includes a beam-splitting cube 121 and a plano-convex lens 122 sequentially disposed in the imaging aperture 111. The light emitted by the light source 13 is incident on the beam-splitting cube 121. After the light path direction is adjusted by the beam-splitting cube 121, it is converged by the plano-convex lens 122 to the target plane used to generate the optical interference pattern, i.e., the position of the Fabry-Perot microcavity. The reflected light of the interference pattern passes through the plano-convex lens 122, and is then transmitted through the beam-splitting cube 121 before reaching the lens 21 of the imaging element 2, thereby realizing the acquisition and imaging of the interference pattern.
[0039] Furthermore, the preferred optical path component 12 of this utility model also includes a narrowband filter 123 disposed between the light source 13 and the beam splitter 121, and the narrowband filter 123 is further preferably a 633nm narrowband filter, so that the light emitted by the light source 13 is filtered by the narrowband filter 123 to obtain monochromatic light with a center wavelength of 633 nm and a bandwidth of ±10 nm.
[0040] The present invention further preferably uses a beam splitter 121 with a working wavelength range of 450–650 nm. When light is incident at an incident angle of 45°, the incident light can be split into two beams with a ratio of approximately 50% transmission (T) and 50% reflection (R), with a tolerance of ±5% (T / R = 50% : 50% ±5%). Preferably, the plano-convex lens 122 is designed with a wavelength of 350-700 nm and a focal length of 20 mm, so that the light emitted by the light source 13 is reflected by the beam splitter 121 and converged by the plano-convex lens 122 before being incident on the position of the Fabry-Perot microcavity. Furthermore, the reflected light of the interference pattern is transmitted to the lens 21 of the imaging element 2 after being transmitted through the plano-convex lens 122 and then through the beam splitter 121.
[0041] The imaging element 2 in this invention can be any existing digital camera, camcorder, or smartphone, including a CMOS image sensor; to further reduce the difficulty of shooting, the imaging element 2 is preferably a mobile phone; the mobile phone is equipped with a CMOS image sensor to realize the acquisition and imaging of interference patterns.
[0042] Existing optical pressure sensors require equal-inclination interference from the incident light beams when measuring intraocular pressure. For equal-inclination interference, the main requirement is that the angles of incidence and reflection (or refraction) are equal when the two interfering beams are reflected or refracted. In other words, the incident beams must be perpendicular to the surface to ensure complete interference fringes. When a miniature pressure sensor is implanted in a pressure detection environment, its small size makes it impossible to guarantee its horizontal orientation. When using a desktop microscope, the microscope can generally only maintain a vertically downward angle. Therefore, to obtain a complete optical interference pattern, one must rely on intuition to adjust the spatial angle of the object being measured, which is extremely difficult, especially when the object being measured is one whose spatial angle cannot be adjusted, such as an intraocular pressure sensor implanted in the eye. Based on this, this invention proposes an external camera module 1 adaptable to any smartphone. Compared to adjusting the uncertain spatial angle of the object being measured, adjusting the angle of the handheld phone is obviously much easier. Furthermore, we can determine the appropriate angle to tilt the phone based on the real-time image captured by the phone's camera. The optical interference pattern captured in real-time by a mobile phone camera is a square region. When the angle of incidence of light is not perpendicular to the interference plane, the square region is incomplete, appearing as a mixture of bright and dark areas. See also Figure 4 As shown, we can imagine the square interference region as a sealed "box" filled with water, and the bright part as a "bubble" inside the sealed space. The "box" should tilt in the direction the "bubble" is positioned within the square region, until the "bubble" moves to the center of the square region. The mobile phone is the "box." When the "bubble" moves to the center of the square region, the angle of incidence of the light is perpendicular to the interference plane, at which point the complete optical interference pattern is captured.
[0043] To facilitate connection with a mobile phone, the preferred shooting module 1 of this utility model also includes a clamp 14; one end of the clamp 14 is connected to the shooting element 2, i.e., the mobile phone, and the other end is connected to the housing 11.
[0044] The preferred clamp 14 of this utility model is made of polylactic acid (PLA) material and is prepared by extrusion 3D printing process; and more preferably, the clamp 14 is a C-shaped clamp structure, including a C-shaped element 141 and a threaded connector 142; the C-shaped element 141 is connected to the housing 11; the C-shaped element 141 is connected to the shooting element 2 through the threaded connector 142; during use, the mobile phone is placed in the C-shaped element 141 and the connection with the mobile phone is achieved by tightening the threaded connector 142; the preferred opening and closing range of the C-shaped element 141 of this utility model is 8-20mm, which can be adapted to the thickness of most smartphones on the market.
[0045] Furthermore, in this utility model, the housing 11 and the clamp 14 are preferably connected by a snap-fit mechanism. Specifically, the C-shaped element 141 of the clamp 14 preferably has a mounting groove 1411 that matches the housing 11, and the mounting groove 1411 has a recessed point. The outer side of the housing 11 has a protrusion that matches the recessed point. The protrusion and the recessed point cooperate with each other, so that the two parts can be easily assembled or disassembled.
[0046] Furthermore, the mounting slot 1411 is provided with a through hole 1412 that matches the shooting hole 111, so as to avoid the C-shaped element 141 affecting the light transmission.
[0047] In summary, this utility model provides an external shooting module 1 compatible with any smartphone. The shell 11 of the external shooting module 1 is made of environmentally friendly polylactic acid (PLA) material and is manufactured through a precisely controlled extrusion 3D printing process, ensuring consistent structural strength and quality. The shooting module 1 integrates an optimized customized optical path design and high-performance optical components, combined with real-time image capture, to achieve stable shooting of high-quality images. Compared with the first-generation desktop microscope-style image capture method, this module not only guarantees image clarity and optical imaging quality, but also significantly reduces the complexity of user operation and the impact of camera shake during shooting, making the device more portable, more efficient in operation, and improving the user experience and applicability.
[0048] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. An optical interference pattern imaging device, characterized in that, It includes a shooting module (1) and a shooting element (2); wherein, The shooting module (1) includes a housing (11), an optical path component (12) disposed inside the housing (11), and a light source (13) disposed outside the housing (11). The housing (11) is provided with a shooting hole (111); The imaging element (2) includes a lens (21); The imaging aperture (111) is adapted to cooperate with the lens (21) to obtain an interference pattern through the imaging element (2).
2. The optical interference pattern imaging device as described in claim 1, characterized in that, The optical path assembly (12) includes a beam splitter cube (121) and a plano-convex lens (122) sequentially disposed in the imaging aperture (111).
3. The optical interference pattern imaging device as described in claim 2, characterized in that, The optical path assembly (12) also includes a narrowband filter (123) disposed between the light source (13) and the beam splitter (121).
4. The optical interference pattern imaging device as described in claim 3, characterized in that, The narrowband filter (123) is a 633nm narrowband filter.
5. The optical interference pattern imaging device as described in claim 4, characterized in that, The operating wavelength range of the beam-splitting cube (121) is 450–650 nm.
6. The optical interference pattern imaging device as described in claim 5, characterized in that, The plano-convex lens (122) is designed with a wavelength of 350-700nm and a focal length of 20mm.
7. The optical interference pattern imaging apparatus according to any one of claims 1-6, characterized in that, The shooting element (2) is a mobile phone; the mobile phone is equipped with a CMOS image sensor.
8. The optical interference pattern imaging device as described in claim 7, characterized in that, The shooting module (1) also includes a clamp (14); one end of the clamp (14) is connected to the shooting element (2), and the other end is connected to the housing (11).
9. The optical interference pattern imaging device as described in claim 8, characterized in that, The clamp (14) includes a C-shaped element (141) and a threaded connector (142); the C-shaped element (141) is connected to the housing (11); the C-shaped element (141) is connected to the shooting element (2) through the threaded connector (142).
10. The optical interference pattern imaging device as described in claim 9, characterized in that, The C-shaped element (141) is provided with a mounting groove (1411) that is adapted to the housing (11).