CN211292558U - Multi-lens optical fiber type OCT three-dimensional depth detection device - Google Patents
Multi-lens optical fiber type OCT three-dimensional depth detection device Download PDFInfo
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- CN211292558U CN211292558U CN201921252021.7U CN201921252021U CN211292558U CN 211292558 U CN211292558 U CN 211292558U CN 201921252021 U CN201921252021 U CN 201921252021U CN 211292558 U CN211292558 U CN 211292558U
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- 238000001514 detection method Methods 0.000 title claims abstract description 86
- 239000013307 optical fiber Substances 0.000 title claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims abstract description 84
- 239000000523 sample Substances 0.000 claims description 31
- 230000010287 polarization Effects 0.000 claims description 22
- 230000004913 activation Effects 0.000 claims description 2
- 238000012014 optical coherence tomography Methods 0.000 description 13
- 238000003384 imaging method Methods 0.000 description 8
- 239000000835 fiber Substances 0.000 description 3
- 238000007405 data analysis Methods 0.000 description 2
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- 238000012634 optical imaging Methods 0.000 description 2
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Abstract
The utility model provides a three-dimensional degree of depth detection device of many camera lenses optical fiber type OCT. The detection device comprises a main path and a detection branch, wherein the main path comprises a laser source, a first coupler, a first circulator, a control system, a reference arm, a second coupler, a converter and a data acquisition unit. The number of the detection branches is more than two groups, each group of detection branches is connected to the main circuit, and each group of detection branches is provided with an optical switch. The detection device can simultaneously detect optical parameters such as roughness, depression and the like of a plurality of samples to be detected.
Description
Technical Field
The utility model relates to an optical imaging technology field specifically relates to a three-dimensional degree of depth detection device of many camera lenses optic fibre type OCT.
Background
Optical Coherence Tomography (OCT) is a novel Optical imaging technique, and is widely used in many fields such as biomedical detection, material structure, etc. due to its non-contact, non-destructive, high sensitivity and high resolution. OCT techniques have spatial resolution on the order of microns, but the imaging field size is usually on the order of millimeters, and the field range is too small to meet the requirements of most OCT applications. Moreover, the existing OCT equipment only comprises one detection branch, only can detect optical parameters of a single sample, and has extremely limited imaging range.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a multi-lens optical fiber OCT three-dimensional depth detection device capable of simultaneously detecting optical coefficients of a plurality of sample surfaces, which comprises a main path and a detection branch path, wherein the main path comprises a laser light source, a first coupler, a first circulator and a control system, the device comprises a reference arm, a second coupler, a converter and a data acquisition unit, wherein a control system transmits a first starting signal to a laser light source, the laser light source is connected with the first coupler, the first coupler is connected with the reference arm and a first circulator, the reference arm is connected with the second coupler, the first circulator is connected with the second coupler, the second coupler is connected with the converter, the converter is connected with the data acquisition unit, the data acquisition unit transmits an electric signal to the control system, the number of detection branches is more than two, each group of detection branches is connected to a main road, and each group of detection branches is provided with an optical switch.
According to the scheme, the control system sends the starting signal to the laser light source, the laser light source sends laser, and the laser is divided into the first optical signal and the second optical signal after passing through the first coupler. The first optical signal is transmitted to the detection branch circuit through the first circulator, the detection branch circuit emits the first optical signal to the surface of a sample to be detected, the first optical signal returns to the detection branch circuit after being emitted to the surface of the sample to be detected through reflection, the detection branch circuit transmits the reflected first optical signal to the first circulator again, and the first circulator transmits the first optical signal to the second coupler. The second optical signal passes through the reference arm and then to the second coupler. The second coupler transmits the first optical signal and the second optical signal to the converter, the converter converts the first optical signal into a first electric signal, converts the second optical signal into a second electric signal, and then transmits the first electric signal and the second electric signal to the data acquisition unit. And after receiving the first electric signal and the second electric signal, the data acquisition unit transmits the first electric signal and the second electric signal to the control system, and the control system performs data analysis on the first electric signal and the second electric signal to further obtain the optical parameters of the surface of the sample.
In the scheme, the detection device is provided with a plurality of detection branches, optical parameter detection can be simultaneously carried out on a plurality of samples, meanwhile, the plurality of detection branches can also enlarge the OCT imaging range of the whole detection device, and the problem that the imaging range of the existing OCT imaging device is insufficient is solved.
Preferably, each group of detection branches comprises a detection probe, a first lens group and a first reflector, and the optical switch, the detection probe, the first lens group and the first reflector are sequentially connected in series in the detection branches.
In a further aspect, the control system transmits a second activation signal to the optical switch.
In a further embodiment, the frequency of the laser light source is the same as the frequency of the second start signal.
In the above scheme, the laser light source is a high-speed scanning fiber laser, and the laser light source emits high-frequency scanning light. When the first optical signal is transmitted to the detection probe through the first circulator, the control system transmits a second starting signal to the optical switch at the moment, one of the optical switches is closed, the detection branch where the optical switch is located is switched on, and the detection branch detects a corresponding sample. When the sample is detected, the laser light source immediately emits the next beam of scanning light, the control system also immediately transmits the next second starting signal to the optical switch, the other optical switch is closed, and the other detection branch is switched on. Because the frequency of the laser emitted by the laser source is the same as that of the second starting signal, and the frequency of the second starting signal is also very high, when one of the optical switches is closed to finish the detection of the sample, the optical switch is immediately opened, and simultaneously, the other optical switch is closed to finish the detection of the other sample, so that the detection device can realize the optical parameter detection of a plurality of samples in a very short time.
In a further aspect, the first lens group includes a first convex lens and a second convex lens, and the first mirror is located between the first convex lens and the second convex lens.
Still further, the axis of the first convex lens and the axis of the second convex lens are perpendicular to each other.
In a further scheme, the included angle between the axis of the first reflector and the axis of the first convex lens is 45 degrees, and the included angle between the axis of the first reflector and the axis of the second convex lens is 45 degrees.
In the scheme, the first optical signal is emitted from the detection probe, refracted by the first convex lens and reflected by the first reflector, and the included angle between the incident light and the reflected light is 90 degrees. Because the axis of the first convex lens is vertical to the axis of the second convex lens, and the reflected light is parallel to the axis of the second convex lens, the best light-gathering effect can be achieved after the reflected light is refracted by the second convex lens.
In a further aspect, the reference arm includes a second circulator, a polarization controller, a second lens group, and a second reflecting mirror, the second circulator is connected to the polarization controller, and the second lens group is located between the polarization controller and the second reflecting mirror.
Still further, the second lens group includes a third convex lens and a fourth convex lens, and an axis of the third convex lens and an axis of the fourth convex lens overlap.
In a further embodiment, the axis of the second mirror and the axis of the third convex lens overlap.
In the scheme, the second optical signal is transmitted to the polarization controller through the second circulator, then sequentially passes through the third convex lens and the fourth convex lens, is refracted, and then is emitted to the second reflector. The second mirror reflects the second optical signal to the fourth convex lens. The second optical signal sequentially passes through the fourth convex lens, the third convex lens and the polarization controller and returns to the second circulator. Since the polarization state of the light changes when the light is reflected by the mirror, the polarization controller is to correct the polarization state of the reflected second optical signal.
Drawings
Fig. 1 is a schematic view of the working principle of the embodiment of the detecting device of the present invention.
The present invention will be further explained with reference to the drawings and examples.
Detailed Description
Referring to fig. 1, the utility model provides a three-dimensional degree of depth detection device of many camera lenses optical fiber type OCT includes main road and detection branch road, and the main road includes laser source 1, first coupler 2, first circulator 3, control system 4, reference arm, second coupler 5, converter 6, data collection station 7. The control system 4 transmits a first start signal to the laser light source 1. The laser light source 1 is connected with the first coupler 2, the first coupler 2 is connected with the reference arm and the first circulator 3, the reference arm is connected with the second coupler 5, the first circulator 3 is connected with the second coupler 5, the second coupler 5 is connected with the converter 6, the converter 6 is connected with the data collector 7, and the data collector 7 transmits electric signals to the control system 4.
The number of the detection branches is more than two groups, each group of detection branches is connected to the main circuit, and each group of detection branches is provided with an optical switch 8. Each group of detection branch circuits comprises a detection probe 9, a first lens group and a first reflector 10, and the optical switch 8, the detection probe 9, the first lens group and the first reflector 10 are sequentially connected in series in the detection branch circuits. The first lens group includes a first convex lens 11 and a second convex lens 12, and the first reflecting mirror 10 is located between the first convex lens 11 and the second convex lens 12. The axis of the first convex lens 11 and the axis of the second convex lens 12 are perpendicular to each other. The angle between the axis of the first reflector 10 and the axis of the first convex lens 11 is 45 °, and the angle between the axis of the first reflector 10 and the axis of the second convex lens 12 is 45 °.
The reference arm comprises a second circulator 13, a polarization controller 14, a second lens group and a second reflecting mirror 15, wherein the second circulator 13 is connected with the polarization controller 14, and the second lens group is positioned between the polarization controller 14 and the second reflecting mirror 15. The second lens group includes a third convex lens 16 and a fourth convex lens 17, and an axis of the third convex lens 16 and an axis of the fourth convex lens 17 overlap. The axis of the second mirror 15 and the axis of the third convex lens 16 overlap.
In the present embodiment, the control system 4 sends a start signal to the laser light source 1, the laser light source 1 sends laser light, and the laser light is divided into a first optical signal and a second optical signal after passing through the first coupler 2. The first optical signal is transmitted to the detection probe 9 through the first circulator 3, the detection probe 9 transmits the first optical signal to the first convex lens 11, the first convex lens 11 reflects the first optical signal to the first reflector 10, the first reflector 10 reflects the first optical signal to the second convex lens 12, and the second convex lens 12 reflects the first optical signal to the surface of the sample 18 to be measured. The first optical signal is reflected by the surface of the sample 18 to be detected and then returns to the detection probe 9 along the original path, the detection probe 9 transmits the reflected first optical signal to the first circulator 3, and the first circulator 3 transmits the first optical signal to the second coupler 5. The second optical signal is transmitted to the surface of the second reflector 15 through the second circulator 13, the polarization controller 14, the third convex lens 16 and the fourth convex lens 17 in sequence, and the second reflector 15 reflects the second optical signal to the second circulator 13 along the original path. The second circulator 13 then transmits the second optical signal to the second coupler 5. The surface of the second reflector 15 is a smooth horizontal surface, and thus the surface of the second reflector 15 is used as a reference surface. The first optical signal and the second optical signal are converged at the second coupler 5, the second coupler transmits the first optical signal and the second optical signal to the converter 6, the converter 6 converts the first optical signal into a first electrical signal, converts the second optical signal into a second electrical signal, and then transmits the first electrical signal and the second electrical signal to the data collector 7. After receiving the first electrical signal and the second electrical signal, the data acquisition unit 7 transmits the first electrical signal and the second electrical signal to the control system 4, and the control system performs data analysis on the first electrical signal and the second electrical signal. Since the surface of the second reflecting mirror 15 is used as a reference surface, the second electrical signal corresponding to the second optical signal reflected by the second reflecting mirror 15 is a standard signal, and the control system 4 can obtain the difference between the surface of the sample 18 to be measured and the reference surface by comparing and analyzing the first electrical signal and the second electrical signal, so as to obtain the optical coefficient, such as roughness, sag, etc., of the surface of the sample 18 to be measured.
In the present embodiment, when the second optical signal is reflected back to the fourth convex lens 17 via the second mirror 15, the polarization state of the second optical signal changes. Since the second optical signal is required as a reference signal, it is necessary to ensure that the polarization state of the second optical signal emitted from the second circulator 13 is consistent with the polarization state of the second optical signal returned to the second circulator 13. The polarization controller 14 may correct the polarization state of the reflected second optical signal so that the polarization state of the second optical signal exiting from the second circulator 13 is consistent with the polarization state of the second optical signal returning to the second circulator 13.
In this embodiment, the detection device has a plurality of detection branches, and can simultaneously detect optical parameters of a plurality of samples, and the plurality of detection branches can also expand the OCT imaging range of the whole detection device, thereby overcoming the problem of insufficient imaging range of the existing OCT imaging device. The laser light source 1 is a high-speed scanning fiber laser, and the laser light source 1 emits high-frequency scanning light. When a laser light source 1 emits a beam of scanning light, the scanning light is divided into a first optical signal and a second optical signal through the first coupler 2, when the first optical signal is transmitted to the detection probe 9 through the first circulator 3, the control system 4 transmits a second start signal to the optical switch 8 at the moment, the second start signal can only close one of the optical switches 8, a detection branch where the optical switch 8 is located is switched on, and the detection branch detects a corresponding sample. When the laser light source 1 immediately emits the next scanning beam after the sample detection is completed, the control system 4 also immediately transmits the next second start signal to the optical switch 8, closes the other optical switch 8, and turns on the other detection branch. Since the frequency of the laser emitted by the laser source 1 is the same as that of the second starting signal, and the frequency of the second starting signal is also very high, when one of the optical switches 8 is closed to complete the detection of the sample, the optical switch 8 is immediately opened, and simultaneously the other optical switch 8 is closed to complete the detection of the other sample, so that the detection device can realize the optical parameter detection of a plurality of samples in a very short time.
In the present embodiment, the angle between the axis of the first reflecting mirror 10 and the axis of the first convex lens 11 is 45 °, and the angle between the axis of the first reflecting mirror 10 and the axis of the second convex lens 12 is 45 °. When a first optical signal is emitted from the detection probe 9, the first optical signal is refracted by the first convex lens 11 and then reflected by the first reflector 10, and the included angle between the incident light and the reflected light is 90 degrees. Because the axis of the first convex lens 11 is perpendicular to the axis of the second convex lens 12, and the axis of the reflected light is parallel to the axis of the second convex lens 12, the reflected light can achieve the best light-focusing effect after being refracted by the second convex lens 12.
It should be noted that only two sets of detection branches are shown in fig. 1, and actually, the number of detection branches of the device may be two or more, and components included in each set of detection branches are completely the same as those included in the two sets of detection branches shown in fig. 1, and thus are not shown in fig. 1.
While the invention has been shown and described with reference to the present embodiments and preferred versions thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A multi-lens optical fiber type OCT three-dimensional depth detection device comprises a main path and a detection branch path, wherein the main path comprises a laser light source, a first coupler, a first circulator, a control system, a reference arm, a second coupler, a converter and a data collector, the control system transmits a first starting signal to the laser light source, the laser light source is connected with the first coupler, the first coupler is connected with the reference arm and the first circulator, the reference arm is connected with the second coupler, the first circulator is connected with the second coupler, the second coupler is connected with the converter, the converter is connected with the data collector, and the data collector transmits an electric signal to the control system, and the multi-lens optical fiber type OCT three-dimensional depth detection device is characterized in that:
the number of the detection branches is more than two groups, each group of the detection branches is connected to the main circuit, and each group of the detection branches is provided with an optical switch.
2. The multi-lens optical fiber type OCT three-dimensional depth detection device according to claim 1, characterized in that:
every group detect the branch road all includes test probe, first battery of lens and first speculum, the photoswitch detect probe first battery of lens with first speculum establishes ties in proper order sets up in the detection branch road.
3. The multi-lens optical fiber type OCT three-dimensional depth detection device according to claim 1, characterized in that:
the control system transmits a second activation signal to the optical switch.
4. The multi-lens optical fiber type OCT three-dimensional depth detection device according to claim 3, characterized in that:
the frequency of the laser light source is the same as the frequency of the second starting signal.
5. The multi-lens optical fiber type OCT three-dimensional depth detection device according to claim 2, characterized in that:
the first lens group comprises a first convex lens and a second convex lens, and the first reflector is positioned between the first convex lens and the second convex lens.
6. The multi-lens optical fiber type OCT three-dimensional depth detection device according to claim 5, characterized in that:
the axis of the first convex lens and the axis of the second convex lens are perpendicular to each other.
7. The multi-lens optical fiber type OCT three-dimensional depth detection device according to claim 6, characterized in that:
the axis of the first reflector and the included angle of the axis of the first convex lens are 45 degrees, and the axis of the first reflector and the included angle between the axes of the second convex lens are 45 degrees.
8. The multi-lens optical fiber type OCT three-dimensional depth detection device according to claim 7, characterized in that:
the reference arm comprises a second circulator, a polarization controller, a second lens group and a second reflecting mirror, the second circulator is connected with the polarization controller, and the second lens group is located between the polarization controller and the second reflecting mirror.
9. The multi-lens optical fiber type OCT three-dimensional depth detection device according to claim 8, characterized in that:
the second lens group includes a third convex lens and a fourth convex lens, and an axis of the third convex lens and an axis of the fourth convex lens overlap.
10. The multi-lens optical fiber type OCT three-dimensional depth detection device according to claim 9, characterized in that:
the axis of the second reflector and the axis of the third convex lens are overlapped.
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