CN207306652U - Non-contact tonometer detecting system based on low-coherent light interference - Google Patents
Non-contact tonometer detecting system based on low-coherent light interference Download PDFInfo
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- CN207306652U CN207306652U CN201720371528.9U CN201720371528U CN207306652U CN 207306652 U CN207306652 U CN 207306652U CN 201720371528 U CN201720371528 U CN 201720371528U CN 207306652 U CN207306652 U CN 207306652U
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- light
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- light path
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Abstract
The utility model discloses a kind of non-contact tonometer detecting system based on low-coherent light interference, including light point and the light path that flows back, signal acquisition and calibration light path, reference arm light path, data acquisition and preservation control module, terminal data processing module and display and Mechanical course terminal, detection of eyeball tension system provided by the utility model, flattened with cornea endosexine as measurement intraocular pressure normative reference, and signal acquisition and half-reflecting half mirror in calibration light path and the same shaft end of the first convergent lens use fixation light source, scanning light source is set to be incorporated into fixation light source coaxial with gas injection direction, improve intraocular pressure value measurement accuracy and speed；In addition, light beam needs to improve the security of detection by luminous power detection before eyeball is entered, there is provided at the same time and be equipped with the cleanliness that clarifier ensure that jet-stream wind in the gas generating unit of jet-stream wind between piston and air cavity, and whole system ensure that the security reliability and stability of whole measurement process before normal operation by debugging.
Description
Technical field
It the utility model is related to detection of eyeball tension technical field, more particularly to a kind of non-contact eye based on low-coherent light interference
Press detecting system.
Background technology
More tonometry device and method existing at this stage, it is important to be divided into two macrotaxonomies：Contact tonometry
With untouchable tonometry, the contact measurement using Goldman applanation tonometers as representative in numerous measuring methods is
Current most reliable tonometry method, but this method needs to carry out anaesthetic treatment, the behaviour to cornea during operation
Make to those who are investigated there are certain side effect, and if operate deal with improperly, easily cause infection；And in untouchable intraocular pressure
Context of detection can prevent similar problem well.
Mostly use to flatten using cornea extexine in existing untouchable tonometry method and be used as tonometry
The normative reference of value, since cornea is in itself there are certain pliability, causes measurement result less than normal.
Chinese patent 201210413847.3 discloses a kind of jet eye pressure detection device, which passes through air blowing
Device produces air pressure and flattens cornea extexine, while combines longitudinal three-dimensional measurement ectocanthion membrane pressure prosposition by CMOS or CCD
Put and required time, the ectocanthion film information finally measured to the air pressure pressure values and CMOS or CCD that send gas convert,
Draw intraocular pressure value, but the technology is to remove measurement intraocular pressure by being flattened with cornea extexine for standard, since cornea exists necessarily
Pliability, so when cornea extexine is driven plain, cornea endosexine still also in microbend state, directly results in measured value
Less than normal, for the higher eyeball of intraocular pressure value, which will be more obvious.
Utility model content
The purpose of this utility model is to provide a kind of flattened with cornea endosexine can measure for measurement intraocular pressure normative reference
More precisely and stablize the non-contact tonometer detecting system based on low-coherent light interference of intraocular pressure value to solve the prior art not
Foot.
The utility model is achieved through the following technical solutions purpose of utility model：
Based on the non-contact tonometer detecting system of low-coherent light interference, including light point and reflux light path, reference arm light path, letter
Number collection and calibration light path, data acquisition and preserve control module, terminal data processing module and display with Mechanical course terminal,
It is characterized in that, the light beam of the signal acquisition and calibration light path passes through a gas generating unit before eyeball is entered；；
The light point and reflux light path include light source, optical fiber return channel and optical fiber coupling apparatus, and optical fiber coupling apparatus produce light source
Raw light beam is divided into reference beam by power proportions and measuring beam respectively enters reference arm light path and signal acquisition and nominal light
Road, reference beam and measuring beam return in optical fiber coupling apparatus formed interference light and through optical fiber return channel enter data acquisition and
Preserve the diffraction light splitting optical path in control module；
The signal acquisition and calibration light path include the first collimating mirror, scanning galvanometer, half-reflecting half mirror and first and assemble thoroughly
Mirror, the measuring beam injects scanning galvanometer after the first collimating mirror collimation is parallel and changes light path, then is reflected through half-reflecting half mirror
The cornea endosexine of eyeball is gathered in by the first convergent lens afterwards, make incidentally related cornea endosexine flatten degree information
Measuring beam returns in fiber coupler along reversible light path and forms interference light with the reference beam；
The reference arm light path include optical centre set the second collimating mirror on the same line, the second convergent lens and
Speculum, the reference beam becomes directional light after the second collimating mirror collimation, then is mapped to speculum by the second convergent lens
On will be returned with reference beam of the light path with reference to information in the fiber coupler；
The gas generating unit includes air cavity, and the air cavity side wall center opposite with eyeball is equipped with stomata, and first assembles thoroughly
Mirror is embedded in another side wall center of the air cavity opposite with stomata, and air cavity lower end is connected with pressure sensor and for jet-stream wind
Piston；
The data acquisition and preservation control module include the 3rd collimating mirror, diffraction grating, the 3rd convergent lens and CCD phases
Machine, interference light is become directional light by the 3rd collimating mirror, then carries out light-splitting processing by diffraction grating, is then passed through the 3rd convergent lens
Receive CCD camera and gather the signal of interference light；
Computer handles the interference light signal collected in the terminal data processing module；
The display is with Mechanical course terminal for showing the working status of whole system and controlling normal detection program
Carry out.
Further, the same shaft end of the half-reflecting half mirror and the first convergent lens is additionally provided with fixation light source, thus, it is possible to
Avoid the occurrence of because being tested that eyeball is micro- to rotate the measurement error brought, while half-reflecting half mirror is by scanning galvanometer scanning light source and fixation
Light source is incorporated into that gas injection direction is coaxial, avoids the occurrence of the phenomenon for causing fixation light beam shakiness after scanned galvanometer vibration, can
Accurately to demarcate the test position of cornea.
Further, be additionally provided with clarifier between the piston and air cavity, piston by driving stepper motor jet-stream wind, by
This has strictly protected the cleaning that card ejects gas, improves the security and wholesomeness of measuring device.
Further, the data acquisition and to preserve interference light in control module parallel and to incline through the 3rd collimating mirror collimation
40-47 ° of the oblique angle optical information amount maximum that can include first order of diffraction through diffraction grating, the 3rd convergent lens are placed in diffraction light
The big direction of main in grid, thus can by the main it is big on each point of lightwave signal assemble be incident upon on line array CCD photo-sensitive cell
And ensure that the converging focal point of each signal is placed on linear array photo-sensitive cell, there is convergence to strengthen the faint optical signal of interference gained
Effect, CCD camera in the 3rd convergent lens focal position gather interference strength signal, then by computer to interference strength signal into
Row processing.
Further, laser intensity detection device, the laser intensity are additionally provided between light source and the optical fiber return channel
Detection device includes electric rotating machine, light power meter and the light source reflector by electric rotating machine control lifting, thus, electric rotating machine
Driving light source reflector landing, which makes light beam reflect into light power meter, to be detected luminous power.
Further, the light source, gas generating unit and scanning galvanometer control light by corresponding control module respectively
Source triggering, gas generation and purification and scanning galvanometer movement, the laser intensity detection device are controlled by safety detection module, by
This, under the control of corresponding module, light source, gas generating unit, scanning galvanometer and laser intensity detection device are first before operation
It is introduced into debugging mode and ensure that the normal operation of whole system is avoided because misoperation or detection are undesirable and damage system
System.
Non-contact tonometer detecting system provided by the utility model based on low-coherent light interference, has below beneficial to effect
Fruit：
(1) flattened as tonometry reference standard using canthus film inner layer, and will be shaken using half-reflecting half mirror by scanning
The scanning light source of mirror be incorporated into fixation light source it is coaxial with gas injection direction, avoid because scanning galvanometer vibration cause fixation light
The problem of source is unstable, improves tonometry precision；
(2) combine longitudinal three-dimensional data treatment technology using the high smart information gathering advantage of scanning galvanometer and go realization pair
Cornea endosexine flattens the real-time judgment of situation, records real-time atmospheric pressure value by pressure sensor, then measure the straight of interior plane of lamination
Footpath can quickly calculate intraocular pressure value, shorten detection time, improve detection efficiency；
(3) a miniature clarifier is equipped with the gas generating unit of system, ensure that the cleaning of the gas ejected, is improved
The security and wholesomeness of detection device；
(4) whole system is equipped with debugging routine, and all moulds operations in the block and detection meet the requirements and just launch into
Normal operating conditions, avoids misoperation from extending the service life of system, while light source enters before eyeball through luminous power safety
Detection ensure that the physical safety of detected person.
Brief description of the drawings
Fig. 1 is the utility model based on a kind of light path of embodiment of non-contact tonometer detecting system that low-coherent light is interfered
Structure diagram；
Fig. 2 is the operation control flow schematic diagram of Fig. 1；
Fig. 3 is the data flow diagram of control module in Fig. 1；
Wherein：1-eyeball, 2-light point and reflux light path, 21-light source, 22-optical fiber return channel, 23-optical fiber lotus root are closed
Device, 3-signal acquisition and calibration light path, the 31-the first collimating mirror, 32-scanning galvanometer, 33-half-reflecting half mirror, 34-the first
Convergent lens, 35-fixation light source, 4-reference arm light path, the 41-the second collimating mirror, the 42-the second convergent lens, 43-reflection
Mirror, 5-gas generating unit, 51-air cavity, 52-stomata, 53-pressure sensor, 54-piston, 55-clarifier, 56-
Stepper motor, 6-data acquisition and preservation control module, the 61-the three collimating mirror, 62-diffraction grating, 63-the three assembles thoroughly
Mirror, 64-CCD camera, 7-laser intensity detection device, 71-electric rotating machine, 72-light power meter, 73-light source reflector,
8-terminal data processing module, 9-instruction light source.
Embodiment
The embodiment of the utility model is described in further detail below in conjunction with the accompanying drawings.
As shown in Figure 1 to Figure 3, the non-contact tonometer detecting system based on low-coherent light interference, including light point and reflux light
Road 2, reference arm light path 4, signal acquisition and calibration light path 3, data acquisition and preservation control module 6, terminal data processing module 8
With display and Mechanical course terminal, display is with Mechanical course terminal for showing the working status of whole system and controlling normal inspection
The measuring beam of the progress of ranging sequence, signal acquisition and calibration light path 3 passes through gas generating unit, gas before eyeball 1 is entered
Generating means 5 includes air cavity 51, and the side wall center opposite with eyeball 1 of air cavity 51 is equipped with stomata 52, and the first convergent lens 63 is inlayed
At the air cavity 51 another side wall center opposite with stomata 52,51 lower end of air cavity is connected with pressure sensor 53 and for jet-stream wind
Piston 54, in addition, be additionally provided with clarifier 55 between piston 54 and air cavity 51 to ensure the cleanliness of gas injection, piston 54 by
Stepper motor 56 drives jet-stream wind.
Wherein, light point and reflux light path include light source 21, optical fiber return channel 22 and optical fiber coupling apparatus 23, optical fiber coupling apparatus 23
The light beam that light source produces is divided into reference beam by power proportions and measuring beam respectively enters reference arm light path 4 and signal acquisition
And calibration light path 3, reference beam and measuring beam return formed in optical fiber coupling apparatus 23 interference light and through optical fiber return channel into
Enter the diffraction light splitting optical path in terminal data processing module 8.Wherein instruction light source 9 is mainly used for aiding in light path early period to build with after
Phase system maintenance corrects and test.
The second collimating mirror 41, second on the same line is set to assemble thoroughly in addition, reference arm light path 4 includes optical centre
Mirror 42 and speculum 43, reference beam becomes directional light after the second collimating mirror 41 collimation, then is penetrated by the second convergent lens 42
It will be returned on to speculum 43 with reference beam of the light path with reference to information in fiber coupler 23；And signal acquisition and nominal light
Road 3 includes the first 31 mirrors of collimation, scanning galvanometer 32,33 and first convergent lens 34 of half-reflecting half mirror, and measuring beam is accurate through first
Straight mirror 31 collimates parallel rear scanning galvanometer 32 of injecting and changes light path, then passes through the first convergent lens after the reflection of half-reflecting half mirror 33
34 are gathered in the cornea endosexine of eyeball 1, make incidentally to flatten the measuring beam of degree information along reversible in relation to cornea endosexine
Light path returns in fiber coupler 23 and forms interference light with reference beam, in order to avoid occurring because the micro- rotation of tested eyeball 1 is brought
Measurement error, the same shaft end of 33 and first convergent lens 34 of half-reflecting half mirror is additionally provided with fixation light source 35.
Wherein, data acquisition and preservation control module 6 include the 3rd collimating mirror 61, diffraction grating 62, the 3rd convergent lens
63 and CCD camera 64, interference light is become directional light by the 3rd collimating mirror 61, then carries out light-splitting processing by diffraction grating 62, then
CCD camera 64 is received by the 3rd convergent lens 63 and gathers the signal of interference light, then by electric in terminal data processing module 8
Brain handles the interference light signal collected；
Wherein, data acquisition and preserve interference light in control module 6 collimated through the 3rd collimating mirror 61 it is parallel and with inclination angle
47 ° pass through diffraction grating 62, and the 3rd convergent lens 63 is placed in the direction that main is big in diffraction grating 62, and CCD camera 64 is in the 3rd
The focal position collection interference strength signal of convergent lens 63, then interference strength signal is handled by computer.
Laser intensity detection device 7 is additionally provided between 21 light sources and optical fiber return channel 22, the device include electric rotating machine 71,
Light power meter 72 and the light source reflector 73 that lifting is controlled by electric rotating machine 71, laser intensity detection device 7 is by safety detection
Module controls.
In addition, light source 21, gas generating unit 5 and scanning galvanometer 32 control light source 21 by corresponding control module respectively
Triggering, gas generation and purification and scanning galvanometer 32 move, and to be debugged before detection to system, whether judge operations
Meet the requirements.
As shown in Figures 2 and 3, using the non-contact tonometer detection system provided by the utility model interfered based on low-coherent light
When system carries out detection of eyeball tension, include the following steps：
S1, open display and Mechanical course terminal, and display system enters debugging mode, 21 trigger control module of light source, gas
Body occurs and purification control module, data acquisition and preservation control module, scanning galvanometer motion-control module, terminal data processing
Module and safety detection module synchronous averaging；
S2, light source 21, which are triggered, sends low-coherent light, and electric rotating machine 71 starts and drives the landing of light source reflector 73 to make light
Beam reflects into light power meter 72 and luminous power is detected, while gas generating unit 5 stores gas to be sprayed
And purification, scanning galvanometer 32 are in initial position, CCD camera 64 is in data acquisition but does not preserve state；
S3, judge whether operations meet the requirements, and is then to trigger safety detection module control electric rotating machine 71 to drive light
Source speculum 73 rises, and system enters normal operating conditions, otherwise prompt system exception return to step S2.
S4, press detection of eyeball tension button triggering gas generating unit 5, and stepper motor 56 drives piston 54 to promote and produces air-flow
Sprayed by stomata 52, pressure sensor 53 records real-time atmospheric pressure value, and scanning galvanometer 32 is moved by default track, CCD
Camera 64 starts continuous high speed collection interference light signal data and preserves；
S5, terminal data processing module 8 are handled interference light signal data and atmospheric pressure value to obtain intraocular pressure value and aobvious
Show in module and show.
Wherein, data processing is based on following principle：
Airflow function is in the pressure F suffered by unit area on corneaOThe pressure collected in real time equal to pressure sensor 53
Power FtIt is multiplied by air pressure attenuation coefficient β：
FO=β Ft (1)
Wherein β is related with the distance L of 52 diameter D of stomata and sample to be tested to stomata；
Canthus film inner layer is driven plain areal calculation：Stream pressure acts on cornea, cornea is inwardly flattened along the optical axis, flattens
Face shape is rounded by the guiding of cornea original state, and the data handled through longitudinal three-dimensional method can accurately measure canthus film inner layer
The diameter d in pressing face, then canthus film inner layer be driven plain area S and be：
Can obtain intraocular pressure according to formula (1) and (2) is：
P=F0/ S=4 β Ft/πd2Formula (3)
Above-described is only some embodiments of the utility model.To those skilled in the art, exist
On the premise of not departing from the utility model creation design, various modifications and improvements can be made, it is new that these belong to this practicality
The protection domain of type.
Claims (6)
1. based on the non-contact tonometer detecting system of low-coherent light interference, including light point and reflux light path, signal acquisition and calibration
Light path, reference arm light path, data acquisition and preservation control module, terminal data processing module and display and Mechanical course terminal,
It is characterized in that, the light beam of the signal acquisition and calibration light path passes through a gas generating unit before eyeball is entered；
The light point and reflux light path include light source, optical fiber return channel and optical fiber coupling apparatus, and optical fiber coupling apparatus produce light source
Light beam is divided into reference beam by power proportions and measuring beam respectively enters reference arm light path and signal acquisition and calibration light path, ginseng
Examine light beam and measuring beam returns and interference light is formed in optical fiber coupling apparatus and enters data acquisition and preservation through optical fiber return channel
Diffraction light splitting optical path in control module；
The signal acquisition and calibration light path include the first collimating mirror, scanning galvanometer, half-reflecting half mirror and the first convergent lens, institute
State measuring beam and scanning galvanometer change light path is injected after the first collimating mirror collimation is parallel, then pass through after half-reflecting half mirror reflects
First convergent lens is gathered in the cornea endosexine of eyeball, makes the measurement light that degree information is incidentally flattened in relation to cornea endosexine
Beam returns in fiber coupler along reversible light path and forms interference light with the reference beam；
The reference arm light path includes the second collimating mirror, the second convergent lens and the reflection of optical centre setting on the same line
Mirror, the reference beam becomes directional light after the second collimating mirror collimation, then is mapped on speculum and incited somebody to action by the second convergent lens
Reference beam with light path with reference to information is returned in the fiber coupler；
The gas generating unit includes air cavity, and the air cavity side wall center opposite with eyeball is equipped with stomata, the first convergent lens edge
Embedded in the air cavity another side wall center opposite with stomata, air cavity lower end is connected with pressure sensor and the work for jet-stream wind
Plug；
The data acquisition and preservation control module include the 3rd collimating mirror, diffraction grating, the 3rd convergent lens and CCD camera,
Interference light is become directional light by the 3rd collimating mirror, then carries out light-splitting processing by diffraction grating, and being then passed through the 3rd convergent lens makes
CCD camera receives and gathers the signal of interference light；
Computer handles the interference light signal collected in the terminal data processing module；
The display is with Mechanical course terminal for showing the working status of whole system and controlling the progress of normal detection program.
2. the non-contact tonometer detecting system according to claim 1 based on low-coherent light interference, it is characterised in that described
The same shaft end of half-reflecting half mirror and the first convergent lens is additionally provided with fixation light source.
3. the non-contact tonometer detecting system according to claim 1 based on low-coherent light interference, it is characterised in that described
Clarifier is additionally provided between piston and air cavity, piston is by driving stepper motor jet-stream wind.
4. the non-contact tonometer detecting system according to claim 1 based on low-coherent light interference, it is characterised in that described
Data acquisition and preserve control module in interference light through the 3rd collimating mirror collimation it is parallel and with inclination angle 40-47 ° pass through diffraction light
Grid, the 3rd convergent lens are placed in the big direction of main in diffraction grating, and CCD camera is gathered in the focal position of the 3rd convergent lens
Interference strength signal, then interference strength signal is handled by computer.
5. the non-contact tonometer detecting system according to claim 1 based on low-coherent light interference, it is characterised in that described
Be additionally provided with laser intensity detection device between light source and optical fiber return channel, the laser intensity detection device include electric rotating machine,
Light power meter and the light source reflector by electric rotating machine control lifting.
6. the non-contact tonometer detecting system according to claim 5 based on low-coherent light interference, it is characterised in that described
Light source, gas generating unit and scanning galvanometer control light source triggering, gas to occur and purify by corresponding control module respectively
Moved with scanning galvanometer, the laser intensity detection device is controlled by safety detection module.
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| CN201720371528.9U CN207306652U (en) | 2017-04-11 | 2017-04-11 | Non-contact tonometer detecting system based on low-coherent light interference |
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| CN207306652U true CN207306652U (en) | 2018-05-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107095643A (en) * | 2017-04-11 | 2017-08-29 | 佛山科学技术学院 | The non-contact tonometer detecting system and its detection method interfered based on low-coherent light |
-
2017
- 2017-04-11 CN CN201720371528.9U patent/CN207306652U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107095643A (en) * | 2017-04-11 | 2017-08-29 | 佛山科学技术学院 | The non-contact tonometer detecting system and its detection method interfered based on low-coherent light |
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| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180504 Effective date of abandoning: 20190125 |
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| AV01 | Patent right actively abandoned |