CN118000656A

CN118000656A - System and method for measuring target parameters

Info

Publication number: CN118000656A
Application number: CN202410425991.1A
Authority: CN
Inventors: 杨扬
Original assignee: Hunan Huoyan Medical Technology Co ltd
Current assignee: Hunan Huoyan Medical Technology Co ltd
Priority date: 2024-04-10
Filing date: 2024-04-10
Publication date: 2024-05-10

Abstract

The invention relates to the technical field of eye parameter measurement, and discloses a system and a method for measuring target parameters. The measurement system includes: the interferometry module is used for determining a first parameter of the measured object based on the irradiation light of the first light source and the received return light; the interference calibration module is used for splitting the irradiation light of the second light source into at least two second target light rays and processing one of the second target light rays to obtain a third target light ray; the interferometry module is also used for receiving another second target light ray, carrying out delay line processing on the second target light ray and returning a fourth target light ray corresponding to different optical paths; the interference calibration module is also used for receiving the fourth target light ray and determining the correction parameters of the measured object based on the third target light ray and the fourth target light ray; the processing module is used for acquiring the first parameter and the correction parameter, and adjusting the first parameter based on the correction parameter to obtain the target parameter.

Description

System and method for measuring target parameters

Technical Field

The invention relates to the technical field of eye parameter measurement, in particular to a system and a method for measuring target parameters.

Background

In the current environment, myopia prevention and control are urgent. Wherein, the growth of the eye axis plays a leading role in the occurrence and progress of myopia, and the eye axis growth causes the external parallel light to be focused in front of retina, which is myopia; conversely, if the eye axis length is reduced, parallel light is focused behind the retina, which is presbyopia. Therefore, how to accurately measure the parameters of the measured object is a problem to be solved.

Currently, professional measuring instruments such as optometry, corneal topography, etc. are generally used for measuring parameters of the measured object. These instruments are capable of accurately measuring a variety of measured object parameters including fundus to cornea distance. Specifically, during the measurement process, the measuring instrument needs to be moved to acquire the parameters of the measured object at different positions, so as to ensure the accuracy and the comprehensiveness of measurement. For example, to measure the fundus to cornea distance, a specialized staff member may be required to adjust the position of the instrument in order to acquire data from multiple angles or positions.

However, the manner of determining the parameter of the measured object by the professional staff moving the measuring instrument is complicated and is easily affected by subjective judgment of the staff to a certain extent, thereby resulting in inaccurate measurement results.

Disclosure of Invention

In view of this, the present invention provides a system and a method for measuring a target parameter, which solve the problems of complicated method and inaccurate measurement result of the existing method for measuring the parameter of the measured object.

In a first aspect, the present invention provides a system for measuring a target parameter, the system comprising: the interferometry module is used for determining a first parameter of the measured object based on the irradiation light of the first light source and the received return light; the interference calibration module is used for splitting the irradiation light of the second light source into at least two second target light rays and processing one of the second target light rays to obtain a third target light ray; the interferometry module is also used for receiving another second target light ray, carrying out delay line processing on the second target light ray and returning a fourth target light ray corresponding to different optical paths; the optical paths of the third target light rays and the fourth target light rays are the same and correspond to each other one by one; the interference calibration module is also used for receiving the fourth target light ray and determining the correction parameters of the measured object based on the third target light ray and the fourth target light ray; the processing module is used for acquiring the first parameter and the correction parameter, and adjusting the first parameter based on the correction parameter to obtain the target parameter.

According to the target parameter measuring system provided by the embodiment, the irradiation light of the second light source is split into two second target light rays through the interference calibration module, one of the second target light rays is processed, the third target light ray is returned, the other second target optical fiber is processed through the interference measurement module, the fourth target light ray with the same optical path as the third target light ray is returned, the correction parameters of the measured object are determined through the third target light ray and the fourth target light ray, the first parameter obtained by injecting the measured object is corrected through the correction parameters, and the measurement system is not required to be operated manually, so that the target parameters can be conveniently and accurately determined.

In an alternative embodiment, an interferometry module includes: the device comprises a first light source generating unit, a first light source splitting unit, a first interference processing unit, a light source processing unit and a high-speed optical fiber delay line module; a first light source generating unit for emitting an irradiation light of the first light source; the first light source splitting unit is used for splitting the irradiation light of the first light source into at least two first target light rays; the light source processing unit is used for injecting one of the first target light rays into the tested object and receiving the returned fifth target light ray; the fifth target light is light carrying back scattering light information of biological tissue information; the high-speed optical fiber delay line module is used for receiving another first target light ray, and performing delay line processing on the first target light ray to obtain a sixth target light ray with different optical paths; wherein, the optical paths of each fifth target light ray and each sixth target light ray are the same and correspond to each other one by one; the first interference processing unit is used for receiving the sixth target light ray and determining a first parameter corresponding to the measured object based on the fifth target light ray and the sixth target light ray.

According to the measuring system for the target parameters, the optical paths are accurately controlled and processed through the high-speed optical fiber delay line module, the optical paths of all target light rays are guaranteed to be identical and correspond to each other one by one, errors caused by optical path differences are avoided being eliminated, and measuring accuracy and reliability are improved.

Further, splitting the irradiation light of the first light source into at least two first target light rays by the first light source splitting unit can allow two or more light rays having the same or similar characteristics to be simultaneously generated for comparison and analysis in the subsequent interference process. One of the first target light rays is emitted into the detected object and returns the light rays carrying the back scattering light information of the biological tissue information, and the light rays of the back scattering light information can realize non-invasive biological tissue detection, namely, the biological tissue is not required to be subjected to slicing or other forms of physical damage, so that real-time monitoring is carried out under the condition that the normal physiological functions of organisms are not influenced.

In an alternative embodiment, the first interference processing unit comprises: a first reception conversion unit and a second reception conversion unit; the first receiving and converting unit and the second receiving and converting unit are used for converting the fifth target light ray and the sixth target light ray into a first electric signal corresponding to the fifth target light ray and a second electric signal corresponding to the sixth target light ray, and determining a first parameter corresponding to the tested object based on the first electric signal and the second electric signal.

According to the measuring system for the target parameters, which is provided by the embodiment, based on the first electric signal and the second electric signal, the first interference processing unit can accurately determine the first parameters corresponding to the measured object. Since the processing and analysis of electrical signals is generally more convenient and accurate than the direct processing of optical signals, this way of conversion helps to improve the accuracy and reliability of parameter determination. And the receiving and converting unit enables the interferometry module to process light signals with different types and intensities, so as to adapt to the requirements of different measured objects and measuring environments.

In an alternative embodiment, the light source processing unit comprises: the device comprises a light-transmitting optical fiber collimator, a zoom lens turntable, a first dichroic mirror and a second dichroic mirror; the light-transmitting optical fiber collimator is used for carrying out collimation treatment on one first target light ray to generate a treated first target light ray; the zoom lens rotating disc is used for receiving the processed first target light, enabling the processed first target light to sequentially pass through the first dichroic mirror and the second dichroic mirror to be shot into the tested object, and receiving the returned fifth target light.

According to the target parameter measuring system provided by the embodiment, one path of first target light is collimated by the light-transmitting optical fiber collimator, and the processed first target light is generated. The light-transmitting optical fiber collimator can ensure that the propagation direction of light is more accurate and stable, so that the measurement precision and reliability are improved. The zoom lens group receives the first target light after collimation treatment, and the first target light is sequentially transmitted through the first dichroic mirror and the second dichroic mirror to be shot into the measured object. Because the zoom lens turntable has the advantages of large zoom range, simple control, convenient processing, low cost and the like, the requirements of different measurement scenes can be met, and the accurate measurement of objects with different distances can be realized by adjusting the focal length of the zoom lens turntable. The dichroic mirror selectively transmits or reflects light according to the wavelength, so that the light with the specific wavelength can accurately reach the measured object, and the accuracy and the stability of the measurement result are ensured due to the characteristics of high hardness, good spectral uniformity and strong center wave stability of the dichroic mirror.

In an alternative embodiment, the measurement system further comprises: an illumination module, a corneal topography measurement module, and a camera module; the illumination module is used for emitting illumination light to a first target ray which enters the object to be tested and injecting the illumination light into the object to be tested to generate an image of the object to be tested; and the cornea topographic map measuring module is used for sending the image of the measured object to the camera module and generating the image of the measured object.

According to the measuring system for the target parameters, when the first target light is visible light, the illumination module can emit high-quality illumination light to provide uniform illumination with proper brightness for the measured object, so that the generated measured object image is clearer; the illumination module can fuse the first target light rays when the first target light rays are invisible light rays, so that the first target light rays can be imaged.

In addition, the camera module can capture high-resolution images, so that the details of the tested object can be clearly displayed.

In an alternative embodiment, the lighting module comprises: the device comprises a first illumination light generation unit, a second illumination light generation unit, a light passing slit, a light spot shaping slit, a beam splitting prism, a first beam shaping lens, a first plane mirror and a second beam shaping lens; a first illumination light generation unit for generating first illumination light and injecting the first illumination light into the first beam shaping lens through the light passing slit; the second illumination light generation unit is used for generating second illumination light and emitting the second illumination light into the beam splitting prism through the spot shaping slit; a beam splitting prism for injecting the second illumination light into the first beam shaping lens; a first beam shaping lens for transmitting the first illumination light and the second illumination light to the first plane mirror; the plane reflector is used for deflecting the optical paths of the first illumination light and the second illumination light by a first preset angle and injecting the first illumination light and the second illumination light into the second beam shaping lens; the second beam shaping lens is used for respectively adjusting the first illumination light and the second illumination light into third illumination light corresponding to the first illumination light and fourth illumination light corresponding to the second illumination light; the third illumination light and the fourth illumination light are provided with large-size light spots with uniform energy; and the third illumination light and the first target light which is emitted into the tested object are fused and emitted into the tested object, so that an image of the tested object is generated.

According to the measuring system for the target parameters, provided by the embodiment, the first beam shaping lens and the second beam shaping lens can shape illumination light, and the distribution and the shape of the illumination light can be adjusted. Therefore, the light energy can be ensured to be uniformly distributed on the large-size light spot, the illumination effect is improved, and the measurement error caused by the uneven light spot is avoided. The plane mirror and the two-way dichroic mirror can deflect the light path by a preset angle, so that the light can propagate according to a preset path, and the system can adapt to complex optical layout, and meanwhile, the stability and the accuracy of the light path are maintained. In addition, the illumination light and the first target light are fused and are injected into the object to be measured, so that on one hand, enough illumination intensity can be provided, and interference between the light is avoided.

In an alternative embodiment, a high-speed fiber delay line module includes: the device comprises a wavelength division multiplexer, an optical fiber collimator, a delay line turntable, a cylindrical mirror and a second plane reflecting mirror; the wavelength division multiplexer is used for injecting the first target light into the optical fiber collimator; the optical fiber collimator is used for converting the first target light into parallel light and injecting the parallel light into the delay line turntable; and the delay line turntable is used for rotating based on the rotating motor so as to perform delay line processing on the second target light to obtain fourth target light corresponding to different optical paths, and returning the fourth target light to the first receiving and converting unit and the second receiving and converting unit through the cylindrical mirror and the second plane mirror.

According to the measuring system for the target parameters, which is provided by the embodiment, a plurality of optical signals with different wavelengths can be transmitted simultaneously through the wavelength division multiplexer, so that the bandwidth utilization rate of the optical fiber is greatly improved. The optical fiber collimator converts the first target light into parallel light, so that the stability and consistency of optical signals are ensured. The delay line turntable rotates through the rotating motor, and can process the delay line on the first target light, so that the accurate control and adjustment of the optical signal are realized. The combined use of the cylindrical mirror and the second planar mirror can effectively reflect and guide the optical signal, ensuring that the optical signal can be accurately returned to the first receiving conversion unit and the second receiving conversion unit.

In an alternative embodiment, the measurement system further comprises: a corneal topography measurement module and a camera module; the corneal topography measurement module comprises: the device comprises a placido multi-ring, a beam splitter, a third plane reflector, a focusing lens and a focusing lens; the placido multi-ring is used for generating a plurality of lamp ring light rays with different radiuses and reflecting the lamp ring light rays into the beam splitter through the cornea surface; the beam splitter is used for enabling a plurality of lamp ring light rays with different radiuses to be in the same light path with the fourth target light ray and injecting the lamp ring light rays into the third plane reflector; the third plane reflector is used for deflecting the light rays of the lamp ring by a third preset angle and injecting the light rays into the focusing lens; the focusing lens is used for zooming the lamp ring light based on the fixed zoom ratio and injecting the lamp ring light into the focusing lens; and the focusing lens is used for injecting the lamp ring light rays with different radiuses into the camera module to generate imaging pictures corresponding to the lamp ring light rays.

According to the measuring system for the target parameters, a plurality of lamp ring light rays with different radiuses can be generated through placido multiple rings, and the lamp ring light rays are reflected by the cornea surface, so that the fine morphological change of the cornea surface can be captured. The beam splitter enables the lamp ring light rays with different radiuses and the fourth target light ray to be in the same light path. This not only simplifies the structure of the optical system, but also improves the utilization ratio of light energy. Meanwhile, as the light path is shared by the lamp ring light and the target light, the projection positions of the lamp ring light and the target light on the cornea are ensured to be consistent, and therefore the measurement accuracy is improved. The plane reflector deflects the light of the lamp ring by a certain angle, so that the light can smoothly enter the focusing lens, the light path layout is more compact, and meanwhile, the loss of the light is reduced.

The focusing lens has fixed zoom ratio, can carry out accurate zooming to the lamp ring light for the lamp ring of different radiuses can be clearly discernable on the imaging picture, thereby has improved the resolution ratio and the accuracy of cornea topography. The focusing lens focuses the lamp ring light after the focusing lens is processed onto the photosensitive element of the camera module, and through accurate focusing, high-quality imaging pictures can be generated, so that the accuracy and reliability of cornea topographic map measurement are further improved.

In an alternative embodiment, the processing module is connected with the camera module and is used for calculating the values of the major axis and the minor axis of the ellipse according to a plurality of cornea curvature points on any meridian passing through the circle center on the imaging picture by using least square curve fitting, and determining the cornea curvature radius based on the values of the major axis and the minor axis of the ellipse.

The method for measuring the target parameters can accurately identify and analyze a plurality of curvature points on the cornea through the high-resolution image captured by the camera module. By applying a least square method to a plurality of cornea curvature points on a meridian passing through the circle center to perform curve fitting, a smoother and more accurate cornea curvature curve can be obtained, so that measurement errors can be reduced, and the accuracy of cornea curvature calculation is improved. Based on the curve obtained by fitting, the values of the major axis and the minor axis of the ellipse can be further calculated, and the curvature radius of the cornea can be directly reflected.

In a second aspect, the present invention provides a method for measuring a target parameter, the method being applied to the target parameter measuring system of the first aspect, the method comprising: acquiring a first light ray and at least two second target light rays; wherein, the first light includes: the irradiation light of the first light source and the received return light; determining a first parameter of the measured object based on the first light ray; processing the second target light ray to obtain a third target light ray and a fourth target light ray; the optical path of each third target light ray is the same as that of the fourth target light ray, and corresponds to each other one by one; determining a correction parameter of the measured object based on the third target light ray and the fourth target light ray; and adjusting the first parameter based on the correction parameter to generate a target parameter.

In a third aspect, the present invention provides a computer device comprising: the device comprises a memory and a processor, wherein the memory and the processor are in communication connection, the memory stores computer instructions, and the processor executes the computer instructions, so that the method for measuring the target parameter according to the first aspect or any corresponding implementation mode of the first aspect is executed.

In a fourth aspect, the present invention provides a computer-readable storage medium having stored thereon computer instructions for causing a computer to execute the method for measuring a target parameter of the first aspect or any of its corresponding embodiments.

In a fifth aspect, the present invention provides a computer program product comprising computer instructions for causing a computer to perform the method of measuring a target parameter of the first aspect or any of its corresponding embodiments.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a measurement system for a target parameter according to an embodiment of the invention;

FIG. 2 is a block diagram of a measurement system for a target parameter according to an embodiment of the invention;

FIG. 3 is a schematic diagram of the structure of a delay line turntable of a measurement system for a target parameter according to an embodiment of the invention;

FIG. 4 is a schematic view of the structure of a focus lens of a measurement system of target parameters according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of the structure of a placido loop of a target parameter measurement system according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a measurement system for a target parameter according to an embodiment of the invention;

FIG. 7 is a flow chart of a method of measuring a target parameter according to an embodiment of the invention;

FIG. 8 is a block diagram of a measurement device for a target parameter according to an embodiment of the invention;

fig. 9 is a schematic diagram of a hardware structure of a computer device according to an embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Based on the knowledge of the related technology, the myopia problem becomes a serious public health problem which is harmful to the eyesight safety of the national under the current environment, and myopia prevention and control are urgent. Wherein, the growth of the eye axis plays a leading role in the occurrence and progress of myopia, and the eye axis growth causes the external parallel light to be focused in front of retina, which is myopia; conversely, if the eye axis length is reduced, parallel light is focused behind the retina, which is presbyopia. Therefore, how to accurately measure the parameters of the measured object is a problem to be solved.

Based on the above, the invention provides a target parameter measurement system, which splits the irradiation light of a second light source into two second target lights through an interference calibration module, processes one of the second target lights, returns a third target light, processes the other second target optical fiber through an interference measurement module, returns a fourth target light with the same optical path as the third target light, determines the correction parameters of a measured object through the third target light and the fourth target light, corrects the first parameter obtained by injecting the measured object through the correction parameters, and does not need to manually operate the measurement system, thereby conveniently and accurately determining the target parameters.

In the embodiment of the invention, a measurement system of a target parameter is provided, fig. 1 is a schematic diagram of the measurement system of the target parameter according to the embodiment of the invention, as shown in fig. 1, an interferometry module a, an interferometry calibration module B and a processing module C; the interferometry module A is used for determining a first parameter of the measured object based on the irradiation light of the first light source and the received return light. The interference calibration module B is used for splitting the irradiation light of the second light source into at least two second target light rays and processing one of the second target light rays to obtain a third target light ray. The interferometry module A is also used for receiving another second target light ray, carrying out delay line processing on the second target light ray and returning a fourth target light ray corresponding to different optical paths; the optical paths of the third target light rays and the fourth target light rays are the same and correspond to each other one by one. The interference calibration module B is also used for receiving the fourth target light ray and determining the correction parameters of the measured object based on the third target light ray and the fourth target light ray. And the processing module C is used for acquiring the first parameter and the correction parameter, and adjusting the first parameter based on the correction parameter to obtain the target parameter.

The object under test may be used to characterize an organ of the human body, for example: eyes, heart, etc. may also be used to characterize other objects that may be measured, such as: electronic products such as mobile phones are not particularly limited herein and may be realized by those skilled in the art.

The interferometry module a is used for characterizing a module for measuring the surface appearance or optical parameters of an object based on the interference phenomenon and superposition principle of light waves, for example: when the measured object is a human eye, the interferometry module A can be used for positioning the position interference information of each surface of the eye and extracting the information of cornea thickness, anterior chamber depth, lens thickness, vitreous body thickness and eye axis length. Specifically, the interferometry module a emits an illumination light of the first light source, and the illumination light interacts with the measured object to generate reflection or transmission, so as to form a return light, where the return light carries information (such as information of eyes) of the surface of the measured object, such as morphology, optical parameters, and the like. The interferometry module a can accurately measure the phase difference of the light waves by receiving and processing the return light rays, and then based on the measurement of the phase difference, the interferometry module a can further calculate the first parameter of the measured object. The first parameter may be, for example, a distance from a leucoma to a leucoma, a distance from a front surface of a cornea to a rear surface of a retina, a thickness of a cornea, or the like, and is not particularly limited herein.

Alternatively, the illumination light of the first light source may be (830±50 nm) interferometric light.

The interferometry module B is a module for accurately calibrating and calibrating the interferometry module A. Specifically, the interference calibration module B emits the illumination light of the second light source, and divides the second light source into at least two second target light rays. Wherein the two second target rays are the same ray. And then selecting one of the second target light rays obtained through splitting for further processing to obtain a third target light ray. The manner in which the particular process is dependent upon the particular application requirements, including but not limited to the use of spectral filters to select a particular wavelength range; the intensity of the light or the like is adjusted by an optical amplifier or attenuator, which is not particularly limited herein, and may be realized by those skilled in the art.

Alternatively, the value of the illumination light of the second light source may be a calibration light of (1310±50 nm).

The interferometry module A is also used for receiving another second target light, guiding the received second target light to the delay line, and realizing accurate control of the light path length by adjusting the propagation path length of the light in the delay line. The length of the delay line can be adjusted as needed to produce different path delays. Specifically, a fourth target light beam with the same optical path as the third target light beam and the return light beam received by the interferometry module a is obtained through delay line processing. The fourth target light and the third target light interfere with each other, and are converted by the interference calibration module B to form an equidistant and stable high-quality interference fringe, namely a correction parameter, which is used for calibrating an interference measurement light path because the fourth target light and the third target light are not influenced by external factors.

The processing module C is a module for characterizing processing data and performing specific tasks. Specifically, the processing module C is configured to obtain the first parameter and the correction parameter, and then correct the first parameter through the correction parameter to obtain the target parameter. For example: the distance from the fundus to the cornea of the eye is 3 envelopes and is a first parameter, and the distance from the fundus to the cornea of the eye is 5 envelopes and is a correction parameter, then the first parameter is adjusted according to the correction parameter, and the obtained actual target parameter is 5 envelopes.

According to the target parameter measuring system provided by the embodiment, the irradiation light of the second light source is split into two second target light rays through the interference calibration module B, one of the second target light rays is processed, the third target light ray is returned, the other second target optical fiber is processed through the interference measurement module A, the fourth target light ray with the same optical path as the third target light ray is returned, the correction parameters of the measured object are determined through the third target light ray and the fourth target light ray, the first parameter obtained by injecting the measured object is corrected through the correction parameters, and the measurement system is not required to be operated manually, so that the target parameters can be conveniently and accurately determined.

In an alternative embodiment, as shown in connection with fig. 2, the interferometry module a includes: a first light source generating unit 101, a first light source splitting unit 103, a first interference processing unit 102, a light source processing unit 104, and a high-speed optical fiber delay line module 105. The first light source generating unit 101 is configured to emit irradiation light of the first light source. The first light source splitting unit 103 is configured to split an irradiation light of the first light source into at least two first target light rays. The light source processing unit 104 is configured to inject a first target light into the object to be measured and receive a returned fifth target light; the fifth target light is light carrying back scattering light information of biological tissue information. The high-speed optical fiber delay line module 105 is used for receiving another first target light ray, and performing delay line processing on the first target light ray to obtain a sixth target light ray with different optical paths; the optical paths of the fifth target light rays and the sixth target light rays are the same and correspond to each other one by one. The first interference processing unit 102 is configured to receive the sixth target light, and determine a first parameter corresponding to the measured object based on the fifth target light and the sixth target light.

The first light source generating unit 101 may be configured to emit irradiation light of the first light source. The first light source generating unit 101 may be a super-radiation light emitting Diode (Superluminescent LIGHT EMITTING Diode, SLED) or the like, which is not particularly limited herein. Wherein the superluminescent light emitting diode combines the high power of the laser diode and the broad spectral characteristics of the broad band Light Emitting Diode (LED), is a light source device between the laser and the light emitting diode. The LED light source has the high brightness of laser and the wide spectrum characteristic of an LED, and can ensure the output power and simultaneously have a wider spectrum range.

The first light source splitting unit 103 may be 33:33:33, or 44:44:44 fiber couplers, etc., are not particularly limited herein. Specifically, the first light source splitting unit 103 can split the irradiation light into at least two first target lights having the same light source light energy.

The light source processing unit 104 is used to process light to perform specific measurement or detection tasks. The light source processing unit 104 includes a series of optical elements and detectors for precisely controlling the propagation path of light rays and receiving returned scattered light. Such as lenses, filters, mirrors, etc., for focusing, filtering, and directing light. The detector is used to receive the returned scattered light and convert it into a processable electrical signal, etc., which is not particularly limited herein and may be implemented by those skilled in the art.

It should be noted that, the sixth target light ray and the fifth target light ray with different optical paths are in one-to-one correspondence, and the optical paths of the corresponding sixth target light ray and the fifth target light ray are the same. For example: the optical path of the fifth target ray characterizes the distance from the fundus to the cornea of the eye, and then the optical path of the corresponding sixth target ray characterizes the same distance from the fundus to the cornea of the eye.

The first interference processing unit 102 is configured to receive the sixth target light, and compare and analyze the sixth target light with the fifth target light received previously. Through the interference phenomenon of the two target light rays, the first interference processing unit 102 can accurately determine the first parameter corresponding to the measured object.

It should be noted that, interference is an expression of a fluctuation property, and when two or more light waves meet at a position in space, light intensity is redistributed due to superposition of vibration of the two or more light waves, so as to form stable stripes with alternating intensity and weakness. In optical measurements, interference phenomena are often used to measure physical quantities such as length, angle, refractive index, etc. In the present embodiment, the fifth target light and the sixth target light reach the first interference processing unit 102 through different paths. They reach the first interference processing unit 102 through different parts of the object to be measured or through different optical elements, respectively, that is, the fifth target light reaches the first interference processing unit 102 through the object to be measured, and the sixth target light reaches the first interference processing unit 102 through the high-speed optical fiber delay line module 105.

When the two light rays of the same optical path meet in the first interference processing unit 102, they interfere to determine the first parameter. For example: when the two light beams with the same optical path meet in the first interference processing unit 102, they interfere to form a specific interference pattern, and the first interference processing unit 102 can extract the first parameter related to the measured object by analyzing the interference pattern. For another example: the interference signals are transmitted to the first interference processing unit 102, and the first interference processing unit 102 extracts the interference signals in the depth direction of the eyes through difference, and obtains the interference signals with high intensity through band-pass filtering, hilbert extraction envelope and low-pass filtering modes, so that the first parameter of the measured object is determined. The first parameter may be a distance from a leucoma to a leucoma of the subject, a distance from a front surface of the cornea to a rear surface of the retina, a thickness of the cornea, and the like, which are not particularly limited herein.

According to the measuring system for the target parameters, the high-speed optical fiber delay line module 105 is used for accurately controlling and processing the optical paths, so that the optical paths of all target rays are identical and correspond to each other one by one, errors caused by optical path differences are avoided being eliminated, and the measuring accuracy and reliability are improved.

Further, splitting the irradiation light of the first light source into at least two first target light rays by the first light source splitting unit 103 can allow two or more light rays having the same or similar characteristics to be simultaneously generated for comparison and analysis in the subsequent interference process. One of the first target light rays is emitted into the detected object and returns the light rays carrying the back scattering light information of the biological tissue information, and the light rays of the back scattering light information can realize non-invasive biological tissue detection, namely, the biological tissue is not required to be subjected to slicing or other forms of physical damage, so that real-time monitoring is carried out under the condition that the normal physiological functions of organisms are not influenced.

In an alternative embodiment, as shown in fig. 2, the first interference processing unit 102 includes: a first reception conversion unit 1021 and a second reception conversion unit 1022; the first receiving and converting unit 1021 and the second receiving and converting unit 1022 are configured to convert the fifth target light and the sixth target light into a first electrical signal corresponding to the fifth target light and a second electrical signal corresponding to the sixth target light, and determine a first parameter corresponding to the measured object based on the first electrical signal and the second electrical signal.

The first receiving conversion unit 1021 may be a first photodetector; the second reception conversion unit 1022 may be a second photodetector. The first photoelectric detector and the second photoelectric detector both receive the fifth target light and the sixth target light and respectively convert the fifth target light and the sixth target light into a first electric signal corresponding to the fifth target light and a second electric signal corresponding to the sixth target light. The first electric signal and the second electric signal respectively represent phase information of light reflected by different depths of the measured object. Since the light propagates through the transparent object, a phase delay occurs, which is directly related to the different depths of the object under test. Therefore, by comparing the phase differences of the two electric signals, we can indirectly obtain different depth information of the measured object.

According to the measuring system for the target parameters, which is provided by the embodiment, based on the first electric signal and the second electric signal, the first interference processing unit can accurately determine the first parameters corresponding to the measured object. Since the processing and analysis of electrical signals is generally more convenient and accurate than the direct processing of optical signals, this way of conversion helps to improve the accuracy and reliability of parameter determination. And moreover, the receiving and converting unit enables the interferometry module A to process light signals of different types and intensities, so that the requirements of different measured objects and measuring environments are met.

In an alternative embodiment, as shown in connection with fig. 2, the high-speed fiber delay line module 105 includes: wavelength division multiplexer 1051, fiber collimator 1052, delay line turntable 1055, cylindrical mirror 1054, and second planar mirror 1053; a wavelength division multiplexer 1051 for injecting a first target light into the fiber collimator 1052; the optical fiber collimator 1052 is used for converting the first target light into parallel light and injecting the parallel light into the delay line turntable 1055; the delay line turntable 1055 is configured to rotate based on the rotating motor, to perform delay line processing on the first target light, to obtain a sixth target light corresponding to different optical paths, and to return the sixth target light to the first receiving and converting unit 1021 and the second receiving and converting unit 1022 through the cylindrical mirror 1054 and the second plane mirror 1053.

The wavelength division multiplexer 1051 is used to couple two illumination light beams with inconsistent wavelengths, and to re-split the mixed illumination light beam into two independent return light beams, which in this embodiment is used to couple the interferometry light and the interferometry calibration light in the optical path of the optical fiber delay line device.

The fiber collimator 1052 is an important optical element, and is mainly used for converting transmission light in an optical fiber into collimated light (parallel light).

The delay line turntable 1055 is connected with a rotating motor, the center of the delay line turntable 1055 is supported by the rotating motor, the delay line turntable 1055 can rotate at a constant speed around a central point, and the incident angle and the incident position distance of light and delay line glass change in the rotating process, so that the optical path from the position of emergent light of the optical fiber collimator 1052 to the position of the second plane mirror 1053 changes, interference optical path change is generated, and the acquisition of depth information is realized.

The specific implementation process is as follows: the first target light beam is coupled into the same optical fiber by the low coherence light and the high coherence light after passing through the wavelength division multiplexer 1051, collimated into parallel light by the optical fiber collimator 1052, and the parallel light beam passes through the delay line turntable 1055, exits after generating an optical path difference in the delay line turntable 1055, passes through the cylindrical mirror 1054, is reflected by the second plane mirror 1053, returns to the original path, is received by the first receiving and converting unit 1021 and the second receiving and converting unit 1022 respectively, and is converted into an electrical signal by an optical signal.

Alternatively, a high-speed, high-stability rotating electrical machine may be used. The rotating speed can reach 1000 revolutions per minute, the data can be repeatedly collected 100 times per second, the rapid measurement and collection of biological parameters can be realized, and the error generated by human eye shake during measurement can be effectively reduced.

Preferably, as shown in connection with fig. 2, the interference calibration module B includes a second light source generating unit 201, a third receiving and converting unit 202, a second light source splitting unit 203, a calibration fiber collimator 204, an interference focusing lens 205, and a fourth plane mirror 206. A second light source generating unit 201, configured to emit an illumination light of a second light source, and split the illumination light into at least two second target light beams by a second light source splitting unit 203, where one second target light beam is incident on the wavelength division multiplexer 1051; wherein the wavelength division multiplexer 1051 is configured to inject the second target light into the fiber collimator 1052; the optical fiber collimator 1052 is used for converting the second target light into parallel light and injecting the parallel light into the delay line turntable 1055; the delay line turntable 1055 is configured to rotate based on the rotating motor, to perform delay line processing on the second target light, obtain a fourth target light corresponding to different optical paths, and return the fourth target light to the third receiving and converting unit 202, where another second target light is returned to the third receiving and converting unit 202 after being processed by the interference focusing lens 205 and the fourth plane mirror 206.

Alternatively, the second light splitting unit may be 2:2 an optical fiber coupler.

The specific implementation process is as follows: high coherence narrow bandwidth light source (i.e. the second light source) irradiates light with 2:2 optical fiber coupler is connected, 2: the 2-fiber coupler uniformly divides the irradiation light into two parts, one part is connected with the wavelength division multiplexer 1051 and then is directly irradiated into the delay line rotary table 1055 by the optical fiber collimator 1052, the optical path change is generated by the rotation of the delay line rotary table 1055, and the light is focused to the fourth plane reflector 206 by the cylindrical mirror 1054 and then returns in the original path. The other part is collimated by the calibrated fiber collimator 204 and focused by the interference focusing lens 205 to the fourth plane mirror 206 for return. Wherein the fourth planar mirror 206 serves as a positioning function. Two return rays are at 2:2, coherent waves with uniform width are formed by mutual interference in the optical fiber coupler and are used for calibrating the interference distance of an actual object in an interference imaging optical path.

Preferably, the high speed fiber optic delay line module 105 may include a delay line carousel 1055, as shown in connection with fig. 3, the delay line carousel 1055 being a device that utilizes optical principles to effect signal delay. It is composed of 6 special-surface optical glass blocks 1000, and the glass blocks 1000 all adopt internal reflection optical structures. The structure is characterized in that the reflecting surface is formed by a right-angle surface and an inclined surface, so that light rays are reflected for multiple times inside the glass block 1000, the propagation path of the light rays is increased, and the delay of signals is realized. In the delay line turntable 1055, the incident light and the outgoing light of the delay line turntable 1055 are always in a parallel state. This is because the specially designed reflecting surface ensures that the light rays maintain the same angle and direction at each reflection, thereby ensuring parallelism of the incident light and the outgoing light. Specifically, the high-speed fiber optic delay line module 105 is capable of receiving another first target light ray; the first target light is rotated by the optical fiber delay line to obtain a sixth target light with different optical paths.

According to the measuring system for the target parameters, which is provided by the embodiment, a plurality of optical signals with different wavelengths can be transmitted simultaneously through the wavelength division multiplexer, so that the bandwidth utilization rate of the optical fiber is greatly improved. The optical fiber collimator converts the second target light into parallel light, so that the stability and consistency of optical signals are ensured. The delay line turntable rotates through the rotating motor, and can process the delay line on the second target light, so that the accurate control and adjustment of the optical signal are realized. The combined use of the cylindrical mirror and the plane mirror can effectively reflect and guide the optical signal, ensuring that the optical signal can be accurately returned to the first receiving conversion unit and the second receiving conversion unit.

In an alternative embodiment, as shown in fig. 2, the light source processing unit 104 includes: a light-transmitting fiber collimator 1041, a zoom lens turret 1042, a first dichroic mirror 1043, and a second dichroic mirror 1044; the light-transmitting optical fiber collimator 1041 is configured to collimate one of the first target light rays to generate a processed first target light ray; the zoom lens turret 1042 is configured to receive the processed first target light, and transmit the processed first target light to the measured object through the first dichroic mirror 1043 and the second dichroic mirror 1044 in sequence, and receive the returned fifth target light.

The light-transmitting fiber collimator 1041, the zoom lens turret 1042, the first dichroic mirror 1043, and the second dichroic mirror 1044 are in a straight line. The specific implementation process is as follows: the first target light beam is incident on the light-transmitting fiber collimator 1041 and collimated into parallel light beams, and the parallel light beams enter the measured object through the zoom lens turntable 1042, the first dichroic mirror 1043 and the second dichroic mirror 1044 respectively, and carry back scattered light information of biological tissues of the measured object to return to the fifth target light beam.

According to the target parameter measuring system provided by the embodiment, one path of first target light is collimated by the light-transmitting optical fiber collimator, and the processed first target light is generated. The light-transmitting optical fiber collimator can ensure that the propagation direction of light is more accurate and stable, so that the measurement precision and reliability are improved. The zoom lens turntable receives the first target light after collimation treatment and sequentially transmits the first target light to the object to be measured through the dichroic mirror and the beam splitting mirror. The zoom lens turntable is controlled by the first linear motor to complete focusing of the first target light rays in different depth directions of eyes. Because the zoom lens turntable has the advantages of large zoom range, simple control, convenient processing, low cost and the like, the requirements of different measurement scenes can be met, and the accurate measurement of objects with different distances can be realized by adjusting the focal length of the zoom lens turntable. The dichroic mirror selectively transmits or reflects light according to the wavelength, so that the light with the specific wavelength can accurately reach the measured object, and the accuracy and the stability of the measurement result are ensured due to the characteristics of high hardness, good spectral uniformity and strong center wave stability of the dichroic mirror.

In an alternative embodiment, as shown in fig. 2, in order to enable the interferometry module a to accurately measure the first parameter of the measured object, the measurement system further includes: an illumination module D, a corneal topography measurement module F, and a camera module E; the illumination module D is used for emitting illumination light to a first target ray which enters the tested object and injecting the illumination light into the tested object to generate an image of the tested object; the cornea topography measuring module F is used for sending the image of the measured object to the camera module E and generating the image of the measured object.

The illumination module D is capable of emitting illumination light; when the first target light is invisible light, the illumination module D emits illumination light in the light path transmission direction of the first target light, so that the first target light can be received by the object to be detected, thereby generating an image of the object to be detected, and then the image of the object to be detected is sent to the camera module E, so as to generate an image of the object to be detected. The corneal topography measuring module F in this embodiment is used to send the image of the object to be measured to the camera module E, so that the image of the object to be measured is generated by the camera module E.

According to the measuring system for the target parameters, when the first target light is visible light, the illumination module D can emit high-quality illumination light to provide uniform illumination with proper brightness for the measured object, so that the generated measured object image is clearer; in the case that the first target light is invisible light, the illumination module D can blend the first target light, so that the first target light can be imaged. In addition, the camera module E can capture high-resolution images, so that the details of the tested object can be clearly displayed.

In an alternative embodiment, as shown in connection with fig. 2, the lighting module D comprises: a first illumination light generation unit 301, a second illumination light generation unit 304, a light passing slit 302, a spot shaping slit 305, a beam splitting prism 303, a first beam shaping lens 306, a first plane mirror 307, and a second beam shaping lens 308; a first illumination light generation unit 301 for generating first illumination light and injecting the first illumination light into a first beam shaping lens 306 through a light passing slit 302; a second illumination light generation unit 304 for generating second illumination light and injecting the second illumination light into the splitting prism 303 through the spot shaping slit 305; a beam splitting prism 303 for injecting the second illumination light into the first beam shaping lens 306; a first beam shaping lens 306 for transmitting the first illumination light and the second illumination light to a first plane mirror 307; a first plane mirror 307 for deflecting the optical paths of the first illumination light and the second illumination light by a first preset angle and injecting into the second beam shaping lens 308; a second beam shaping lens 308 for adjusting the first illumination light and the second illumination light to a third illumination light corresponding to the first illumination light and a fourth illumination light corresponding to the second illumination light, respectively; the third illumination light and the fourth illumination light are provided with large-size light spots with uniform energy; and the third illumination light and the first target light which is emitted into the tested object are fused and emitted into the tested object, so that an image of the tested object is generated.

The first illumination light generation unit 301 may be a light emitting diode. The light emitting diode can emit light such as yellow light, and can be determined according to the actual measurement requirement of the measured object, which is not particularly limited herein.

The second illumination light generation unit 304 is a Near-infrared light emitting Diode (NIR-LED). Wherein the near infrared light emitting diode is capable of directly converting electrical energy into near infrared radiant energy.

Alternatively, the first preset angle and the second preset angle may be 90 degrees.

The specific implementation process is as follows: the first illumination light generating unit 301 emits illumination light, the illumination light enters the first beam shaping lens 306 through the light passing slit 302, the first plane mirror 307 is used for deflecting the light path 90 to deflect, the deflected light is shaped into large-size light spots with uniform energy through the second beam shaping lens 308, the large-size light spots are deflected into the measured object through the second deflecting light path 90 of the first dichroic mirror 1043, clear images of the measured object are reflected by the dichroic mirror and enter the camera module E, and the camera module E moves in real time according to the clear images fed back by the camera module E until interference signals reach the maximum value.

The near infrared led emits collimated light, the collimated light is formed into an annular lamp after passing through a spot shaping slit, the annular lamp is reflected by a beam splitting prism 303, the beam is expanded by a focusing lens, then reflected by a second dichroic mirror 1044 to be received by a measured object and focused by a crystalline lens, near-sighted, normal-refractive and far-sighted patients focus on the front end of retina and the rear end of retina respectively, the fundus reflected light of the patients with different diopters presents different divergence states, and the illumination light emitted by a second illumination light generating unit 304 is reflected by the second dichroic mirror 1044, reflected by a third plane mirror 404 to enter the divergence state of the light adjusted by a first focusing lens 403 and a second focusing lens 402 of a cornea topography measuring module F through a second straight motor 2000, and is focused by the cornea focusing lens 401 to form a clear image on a camera module E. When the measured object is eyes, the subject can quickly measure by observing the fixation point so as to stabilize eyeballs.

In the present embodiment, the light path of the light incident on the camera module E and the light path of the illumination module D share one light path, and only the light source is different.

According to the measuring system for the target parameters, provided by the embodiment, the first beam shaping lens and the second beam shaping lens can shape illumination light, and the distribution and the shape of the illumination light can be adjusted. Therefore, the light energy can be ensured to be uniformly distributed on the large-size light spot, the illumination effect is improved, and the measurement error caused by the uneven light spot is avoided. The plane mirror and the two-way dichroic mirror can deflect the light path by a preset angle, so that the light can propagate according to a preset path, and the system can adapt to complex optical layout, and meanwhile, the stability and the accuracy of the light path are maintained. Through the dichroic mirror, the system can integrate illumination light and first target light and shoot into a measured object, so that on one hand, enough illumination intensity can be provided, and interference between light rays is avoided. Meanwhile, the dichroic mirror can also inject fourth illumination light into the measured object to generate a clear measured object image, and high-quality image data is provided for subsequent measurement and analysis.

In an alternative embodiment, as shown in fig. 2, in order to enable full parameter measurement of the measured object, the measurement system further includes: a corneal topography measurement module F and a camera module E; the corneal topography measurement module F includes: a placido ring 407, a third plane mirror 404, a focus lens (a first focus lens 403 and a second focus lens 402), and a focus lens 401; a placido ring 407 for generating a plurality of lamp ring light rays of different radii and reflecting off the corneal surface into a second dichroic mirror 1044; a second dichroic mirror 1044 for placing a plurality of lamp ring light rays having different radii on the same optical path as the fourth target light ray, and injecting the lamp ring light rays into the third plane mirror 404; a third plane mirror 404 for deflecting the lamp ring light by a third preset angle and injecting into the focus lens (the first focus lens 403 and the second focus lens 402); a focus lens (a first focus lens 403 and a second focus lens 402) for zooming the lamp ring light based on a fixed zoom magnification, and entering the focus lens 401; the focusing lens 401 is configured to inject the light ring light rays with different radii into the camera module E, and generate an imaging picture corresponding to the light ring light rays.

As shown in connection with fig. 5, placido rings 407, i.e., placido rings, are devices used to measure the shape of the cornea of an eye. The placido multi-ring 407 is reflected by a circular light bar with a fixed size to generate a plurality of light ring light rays with different radiuses, the light ring light rays are approximately parallel light, the light ring light rays are deflected by a third preset angle through a second dichroic mirror 1044 and a third plane mirror 404, then focused on the element surface of the camera module E through a focusing lens 401 after passing through a first focusing lens 403 and a second focusing lens 402, a clear image with a known scaling ratio is formed, and the actual distance of an object point is calculated according to the clear image form formed by the camera module E and the size change of the image, so that the parameter change conditions such as cornea curvature, cornea elevation and the like are obtained.

According to the measuring system for the target parameters, a plurality of lamp ring light rays with different radiuses can be generated through placido multiple rings, and the lamp ring light rays are reflected by the cornea surface, so that the fine morphological change of the cornea surface can be captured. The beam splitter enables the lamp ring light rays with different radiuses and the fourth target light ray to be in the same light path. This not only simplifies the structure of the optical system, but also improves the utilization ratio of light energy. Meanwhile, as the light path is shared by the lamp ring light and the target light, the projection positions of the lamp ring light and the target light on the cornea are ensured to be consistent, and therefore the measurement accuracy is improved. The third plane reflector deflects the light of the lamp ring by a certain angle, so that the light can smoothly enter the focusing lens, the light path layout is more compact, and meanwhile, the light loss is reduced.

The focusing lens has fixed zoom ratio, can carry out accurate zooming to the lamp ring light for the lamp ring of different radiuses can be clearly discernable on the imaging picture, thereby has improved the resolution ratio and the accuracy of cornea topography. The focusing lens focuses the lamp ring light after the focusing lens treatment onto the photosensitive element of the camera module E, and through accurate focusing, high-quality imaging pictures can be generated, so that the accuracy and reliability of cornea topographic map measurement are further improved.

In an alternative embodiment, the processing module C is connected to the camera module E, and is configured to calculate values of a major axis and a minor axis of the ellipse by using least square curve fitting according to a plurality of corneal curvature points on any meridian passing through the center of the circle on the imaging picture, and determine a radius of curvature of the cornea based on the values of the major axis and the minor axis of the ellipse.

The processing module C identifies any meridian passing through the center of the circle on the imaged picture. There are multiple corneal curvature points on this noon line, which represent the corneal curvature information at different locations. The position information of these points can be extracted by image processing techniques, such as edge detection, threshold segmentation, etc.

The processing module C will apply a least squares method to curve fit these corneal curvature points. The least squares method is a mathematical optimization technique that finds the best functional match of the data by minimizing the sum of squares of the errors. In this application, the processing module C will attempt to find an elliptic curve that best fits the corneal curvature points. After fitting the elliptic curve, the processing module C can calculate the values of the major and minor axes of the ellipse and determine the radius of curvature of the cornea from the values of the major and minor axes.

As shown in fig. 6, optical correction is performed by the first focus lens 403 and the second focus lens 402 to obtain diopter shift, and in the corneal topography measurement mode, the distance between the first focus lens 403 and the second focus lens 402 is equal to the sum of the focal lengths thereof.

The radius of curvature of the cornea is calculated. And calculating the corresponding diopter according to a conversion formula of the curvature radius R and the cornea diopter D1, wherein R=337.5/D1 so as to obtain the curvature condition of each area of the whole cornea, and drawing a cornea topographic map. Wherein d1 is the distance between the length of the optical system and the point of the ring line position, d is the distance between the point of the ring line position and the cornea surface, I is the distance between the point of the ring line position on the disc and the optical axis, h is the distance between the reflection images of different ring lines on the cornea surface, z is the parameter obtained by the angle image,Mean value of h/>The average value of the first ring data point in the cornea reflection h, alpha can be the included angle between the connecting line of the cornea surface projection point and the center of the camera module and the main optical axis, theta can be the included angle between the main optical axis and the normal line of the cornea projection point, phi is the CCD center, and the included angle between the connecting line of the cornea surface projection point and the corresponding ring upper point and the normal line of the projection point.

The method for measuring the target parameters provided in this embodiment can accurately identify and analyze a plurality of curvature points on the cornea through the high-resolution image captured by the camera module E. By applying a least square method to a plurality of cornea curvature points on a meridian passing through the circle center to perform curve fitting, a smoother and more accurate cornea curvature curve can be obtained, so that measurement errors can be reduced, and the accuracy of cornea curvature calculation is improved. Based on the curve obtained by fitting, the values of the major axis and the minor axis of the ellipse can be further calculated, and the curvature radius of the cornea can be directly reflected.

In this embodiment, a method for measuring a target parameter is provided, which may be used in the above-mentioned system for measuring a target parameter, and fig. 7 is a schematic flow chart of a method for measuring a target parameter according to an embodiment of the invention, as shown in fig. 7, where the flow chart includes the following steps:

Step S101, acquiring a first light ray and at least two second target light rays; wherein, the first light includes: the first light source irradiates light and receives return light.

Step S102, a first parameter of the tested object is determined based on the first light.

Step S103, processing the second target light to obtain a third target light and a fourth target light; the optical path of each third target light ray is the same as that of the fourth target light ray, and corresponds to each other one by one.

Step S104, based on the third target light and the fourth target light, the correction parameters of the measured object are determined.

Step S105, adjusting the first parameter based on the correction parameter, and generating the target parameter.

The first light is obtained by emitting light from a laser light source (namely the first light source); wherein, the first light includes: the first parameter of the measured object is determined by the first light rays.

Through 2: the second light source is split into at least two second target light rays by the optical fiber coupler, the second target light rays are processed to obtain third target light rays and fourth target light rays, and the number of the fourth target light rays and the number of the third target light rays are multiple and correspond to each other one by one; the optical paths of the corresponding third target light ray and fourth target light ray are the same, the third target light ray and fourth target light ray with the same optical path interfere to obtain a correction parameter, and then the first parameter is adjusted through the correction parameter to obtain the target parameter.

According to the target parameter measuring method, the irradiation light of the second light source is split into two second target light rays, one of the second target light rays is processed, the third target light ray is returned, the other second target optical fiber is processed by the delay line, the fourth target light ray with the same optical path as the third target light ray is returned, the correction parameters of the measured object are determined through the third target light ray and the fourth target light ray, the first parameter obtained by injecting the measured object is corrected through the correction parameters, and the measurement system is not required to be operated manually, so that the target parameter can be conveniently and accurately determined.

In this embodiment, a device for measuring a target parameter is further provided, and the device is used to implement the foregoing method embodiment and the preferred implementation manner, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

The present embodiment provides a measurement device for target parameters, as shown in fig. 8, including:

a light acquisition module 801, configured to acquire a first light and at least two second target lights; wherein, the first light includes: the irradiation light of the first light source and the received return light;

A first determining module 802, configured to determine a first parameter of the measured object based on the first light;

The light processing module 803 is configured to process the second target light to obtain a third target light and a fourth target light; the optical path of each third target light ray is the same as that of the fourth target light ray, and corresponds to each other one by one;

A second determining module 804, configured to determine a correction parameter of the measured object based on the third target light and the fourth target light;

The adjustment generation module 805 is configured to adjust the first parameter based on the correction parameter, and generate the target parameter.

Further functional descriptions of the above respective modules and units are the same as those of the above corresponding embodiments, and are not repeated here.

The measurement device of the target parameter in this embodiment is presented in the form of a functional unit, where the functional unit refers to an ASIC (Application SPECIFIC INTEGRATED Circuit) Circuit, a processor and a memory that execute one or more software or a fixed program, and/or other devices that can provide the above functions.

According to the target parameter measuring device provided by the embodiment, the irradiation light of the second light source is split into the two second target light rays, one of the second target light rays is processed, the third target light ray is returned, the other second target optical fiber is processed by the delay line, the fourth target light ray with the same optical path as the third target light ray is returned, the correction parameters of the measured object are determined through the third target light ray and the fourth target light ray, the first parameter obtained by injecting the measured object is corrected through the correction parameters, and the measurement system is not required to be operated manually, so that the target parameter can be conveniently and accurately determined.

The embodiment of the invention also provides computer equipment, which is provided with the measuring device of the target parameters shown in the figure 8.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a computer device according to an alternative embodiment of the present invention, as shown in fig. 9, the computer device includes: one or more processors 10, memory 20, and interfaces for connecting the various components, including high-speed interfaces and low-speed interfaces. The various components are communicatively coupled to each other using different buses and may be mounted on a common motherboard or in other manners as desired. The processor may process instructions executing within the computer device, including instructions stored in or on memory to display graphical information of the GUI on an external input/output device, such as a display device coupled to the interface. In some alternative embodiments, multiple processors and/or multiple buses may be used, if desired, along with multiple memories and multiple memories. Also, multiple computer devices may be connected, each providing a portion of the necessary operations (e.g., as a server array, a set of blade servers, or a multiprocessor system). One processor 10 is illustrated in fig. 9.

The processor 10 may be a central processor, a network processor, or a combination thereof. The processor 10 may further include a hardware chip, among others. The hardware chip may be an application specific integrated circuit, a programmable logic device, or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general-purpose array logic, or any combination thereof.

Wherein the memory 20 stores instructions executable by the at least one processor 10 to cause the at least one processor 10 to perform a method for implementing the embodiments described above.

The memory 20 may include a storage program area that may store an operating system, at least one application program required for functions, and a storage data area; the storage data area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, memory 20 may optionally include memory located remotely from processor 10, which may be connected to the computer device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

Memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk, or solid state disk; the memory 20 may also comprise a combination of the above types of memories.

The computer device also includes a communication interface 30 for the computer device to communicate with other devices or communication networks.

The embodiments of the present invention also provide a computer readable storage medium, and the method according to the embodiments of the present invention described above may be implemented in hardware, firmware, or as a computer code which may be recorded on a storage medium, or as original stored in a remote storage medium or a non-transitory machine readable storage medium downloaded through a network and to be stored in a local storage medium, so that the method described herein may be stored on such software process on a storage medium using a general purpose computer, a special purpose processor, or programmable or special purpose hardware. The storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, a solid state disk or the like; further, the storage medium may also comprise a combination of memories of the kind described above. It will be appreciated that a computer, processor, microprocessor controller or programmable hardware includes a storage element that can store or receive software or computer code that, when accessed and executed by the computer, processor or hardware, implements the methods illustrated by the above embodiments.

Portions of the present invention may be implemented as a computer program product, such as computer program instructions, which when executed by a computer, may invoke or provide methods and/or aspects in accordance with the present invention by way of operation of the computer. Those skilled in the art will appreciate that the form of computer program instructions present in a computer readable medium includes, but is not limited to, source files, executable files, installation package files, etc., and accordingly, the manner in which the computer program instructions are executed by a computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Herein, a computer-readable medium may be any available computer-readable storage medium or communication medium that can be accessed by a computer.

Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.

Claims

1. A measurement system of a target parameter, characterized in that the measurement system is applied to eye parameter measurement; wherein the measurement system comprises:

the interferometry module is used for determining a first parameter of the measured object based on the irradiation light of the first light source and the received return light;

the interference calibration module is used for splitting the irradiation light of the second light source into at least two second target light rays and processing one of the second target light rays to obtain a third target light ray;

the interferometry module is further configured to receive another second target light, perform delay line processing on the second target light, and return fourth target light corresponding to different optical paths; the optical paths of the third target light ray and the fourth target light ray are the same and correspond to each other one by one;

the interference calibration module is further configured to receive the fourth target light, and determine a correction parameter of the measured object based on the third target light and the fourth target light;

The processing module is used for acquiring the first parameter and the correction parameter, and adjusting the first parameter based on the correction parameter to obtain a target parameter.

2. The system for measuring a target parameter of claim 1, wherein the interferometry module comprises: the device comprises a first light source generating unit, a first light source splitting unit, a first interference processing unit, a light source processing unit and a high-speed optical fiber delay line module;

the first light source generating unit is used for emitting the irradiation light of the first light source;

The first light source splitting unit is used for splitting the irradiation light of the first light source into at least two first target light rays;

the light source processing unit is used for injecting one of the first target light rays into the tested object and receiving a returned fifth target light ray; wherein the fifth target light is light carrying back scattering light information of biological tissue information;

the high-speed optical fiber delay line module is used for receiving the other first target light ray, and performing delay line processing on the first target light ray to obtain a sixth target light ray with different optical paths; the optical paths of the fifth target light ray and the sixth target light ray are the same and correspond to each other one by one;

the first interference processing unit is configured to receive the sixth target light, and determine a first parameter corresponding to the measured object based on the fifth target light and the sixth target light.

3. The measurement system of target parameters according to claim 2, wherein the first interference processing unit comprises: a first reception conversion unit and a second reception conversion unit;

The first receiving and converting unit and the second receiving and converting unit are both configured to convert a fifth target light ray and the sixth target light ray into a first electrical signal corresponding to the fifth target light ray and a second electrical signal corresponding to the sixth target light ray, and determine a first parameter corresponding to the measured object based on the first electrical signal and the second electrical signal.

4. A system for measuring a target parameter according to claim 3, wherein the light source processing unit comprises: the device comprises a light-transmitting optical fiber collimator, a zoom lens turntable, a first dichroic mirror and a second dichroic mirror;

The light-transmitting optical fiber collimator is used for carrying out collimation treatment on one of the first target light rays and generating the treated first target light rays;

The zoom lens turntable is used for receiving the processed first target light, enabling the processed first target light to sequentially pass through the first dichroic mirror and the second dichroic mirror to be shot into the tested object, and receiving the returned fifth target light.

5. The system for measuring a target parameter of claim 2, further comprising: an illumination module, a corneal topography measurement module, and a camera module;

The illumination module is used for emitting illumination light to the first target light rays which are emitted into the tested object, and emitting the illumination light into the tested object to generate an image of the tested object;

and the cornea topographic map measuring module is used for sending the image of the measured object to the camera module and generating the image of the measured object.

6. The system for measuring a target parameter of claim 5, wherein the illumination module comprises: the device comprises a first illumination light generation unit, a second illumination light generation unit, a light passing slit, a light spot shaping slit, a beam splitting prism, a first beam shaping lens, a first plane mirror and a second beam shaping lens;

A first illumination light generation unit configured to generate first illumination light and to inject the first illumination light into the first beam shaping lens through a light passing slit;

The second illumination light generation unit is used for generating second illumination light and injecting the second illumination light into the beam splitting prism through the spot shaping slit;

the beam splitting prism is used for injecting the second illumination light into the first beam shaping lens;

The first beam shaping lens is used for sending the first illumination light and the second illumination light to the first plane mirror;

the first plane reflector is used for deflecting the optical paths of the first illumination light and the second illumination light by a first preset angle and injecting the first illumination light and the second illumination light into the second beam shaping lens;

The second beam shaping lens is used for respectively adjusting the first illumination light and the second illumination light into third illumination light corresponding to the first illumination light and fourth illumination light corresponding to the second illumination light; wherein the third illumination light and the fourth illumination light both have large-size light spots with uniform energy; and the third illumination light and the first target light which is emitted into the tested object are fused and emitted into the tested object, so that an image of the tested object is generated.

7. A system for measuring a target parameter as defined in claim 3, wherein the high-speed fiber delay line module comprises: the device comprises a wavelength division multiplexer, an optical fiber collimator, a delay line turntable, a cylindrical mirror and a second plane reflecting mirror;

The wavelength division multiplexer is used for injecting the first target light into the optical fiber collimator;

the optical fiber collimator is used for converting the first target light into parallel light and injecting the parallel light into the delay line turntable;

The delay line turntable is used for rotating based on a rotating motor so as to perform delay line processing on the first target light to obtain a sixth target light corresponding to different optical paths, and returning the sixth target light to the first receiving conversion unit and the second receiving conversion unit through the cylindrical mirror and the second plane mirror.

8. The system for measuring a target parameter of claim 4, further comprising: a corneal topography measurement module and a camera module; the corneal topography measurement module comprises: a placido ring, a third plane reflector, a focusing lens and a focusing lens;

the placido rings are used for generating a plurality of lamp ring light rays with different radiuses and reflecting the lamp ring light rays into the second dichroic mirror through the cornea surface;

The second dichroic mirror is configured to locate the plurality of lamp ring light rays with different radii on the same optical path as the fourth target light ray, and inject the lamp ring light rays into the third plane mirror;

the third plane reflecting mirror is used for deflecting the light rays of the lamp ring by a third preset angle and injecting the light rays into the focusing lens;

The focusing lens is used for zooming the lamp ring light rays based on fixed zooming magnification and injecting the lamp ring light rays into the focusing lens;

And the focusing lens is used for injecting the lamp ring light rays with different radiuses into the camera module to generate an imaging picture corresponding to the lamp ring light rays.

9. The system for measuring a target parameter according to claim 8, wherein,

The processing module is connected with the camera module and is used for calculating the values of the major axis and the minor axis of the ellipse by using least square curve fitting according to a plurality of cornea curvature points on any meridian passing through the circle center on the imaging picture, and determining the cornea curvature radius based on the values of the major axis and the minor axis of the ellipse.

10. A method of measuring a target parameter, characterized in that the method is applied to a system of measuring a target parameter according to any one of claims 1-9, the method being applied to eye parameter measurement, wherein the method comprises:

Acquiring a first light ray and at least two second target light rays; wherein the first light includes: the irradiation light of the first light source and the received return light;

Determining a first parameter of the measured object based on the first light ray;

processing the second target light ray to obtain a third target light ray and a fourth target light ray; the optical path of each third target light ray is the same as the optical path of the fourth target light ray, and corresponds to each other one by one;

Determining a correction parameter of the measured object based on the third target light ray and the fourth target light ray;

and adjusting the first parameter based on the correction parameter to generate a target parameter.