CN113042399B - Automatic performance detection and automatic sorting system for free space type optical isolator - Google Patents
Automatic performance detection and automatic sorting system for free space type optical isolator Download PDFInfo
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- CN113042399B CN113042399B CN202110320106.XA CN202110320106A CN113042399B CN 113042399 B CN113042399 B CN 113042399B CN 202110320106 A CN202110320106 A CN 202110320106A CN 113042399 B CN113042399 B CN 113042399B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
Abstract
The invention discloses a free space type optical isolator performance automatic detection and automatic sorting system, which comprises the following steps: adjusting the light output power of the semiconductor laser, and connecting a light source to an electric control optical switch; the light source is emitted from the light path switched by the optical switch and enters the free space through the collimator after being adjusted by the circulator; the optical fiber enters the optical fiber through the polarizer and the optical isolator to be detected in sequence and finally through the collimator at the other end in a coupling mode; the optical signal passing through the optical isolator to be detected is captured by the sensor through the adjustment of the circulator and is processed through the amplifying circuit; thus, completing the insertion loss measurement of the forward optical path; the STM32 controls the optical switch to switch the optical path, and the process is repeated to complete the isolation measurement of the reverse optical path and carry out logic judgment; counting and storing the detection data of the batch of optical isolators to be detected by the upper computer; the invention has high measurement precision and efficiency, and the detection mode of the sensor on the optical signal can reduce the error influence caused by manual detection.
Description
Technical Field
The invention relates to the technical field of production and manufacturing of online optical passive devices, in particular to a free space type optical isolator performance automatic detection and automatic sorting system.
Background
The optical isolator is widely applied to optical fiber amplifiers, optical fiber lasers, optical fiber CATV networks, satellite communication and the like, and is in a position of short supply and short demand in the market for a long time. Since the eighties, the research on the optical isolator has been emphasized by the developed countries, along with the continuous development of the economy of China and the continuous improvement of the living standard of people, the consumption concept and the consumption standard of people are greatly changed and improved, meanwhile, the economy growing at a high speed in China provides a wide market space for the optical isolator industry, and under the condition, the optical isolator industry in China is also rapidly developed. However, while the number of enterprises in the industry is increased and the competition in the industry is gradually increased, the production method of detecting the performance index of the optical isolator by manpower greatly limits the development of manufacturers. The manual work that most domestic enterprises adopted detects the isolator quality needs place one by one, stir the isolator, adjusts the collimator position, detects with the naked eye and sorts one by one again, and whole process is repeated, boring, consuming time longer, and workman's naked eye has the instability, can't guarantee the rate of accuracy that detects, and this kind of traditional mode has greatly reduced production efficiency and cost height.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide the automatic performance detection and automatic sorting system of the free space type optical isolator, which has the advantages of high measurement speed and high measurement precision, and can help optical isolator manufacturers to realize faster and accurate detection at lower cost.
In order to achieve the purpose, the invention is implemented according to the following technical scheme:
a free space type optical isolator performance automatic detection and automatic sorting system comprises the following steps:
step 1: adjusting the light output power of the semiconductor laser to 20mw, connecting a light source to an electrically controlled optical switch, and controlling the optical switch by an STM32 singlechip to ensure normal switching of an optical path;
step 2: the light source is emitted from the light path switched by the optical switch and enters the free space through the collimator after being adjusted by the circulator;
and step 3: the light entering the free space passes through the polaroid and the optical isolator to be detected in sequence, and is coupled into the optical fiber through the collimator at the other end;
and 4, step 4: the optical signal passing through the optical isolator to be detected is captured by the sensor through the adjustment of the circulator and processed by the amplifying circuit;
and 5: the processed signals are transmitted to an STM32 single chip microcomputer to be subjected to AD conversion and logic judgment, and insertion loss measurement of a forward optical path is completed;
step 6: the STM32 singlechip controls the optical switch to switch the optical path, and the process is repeated to complete the isolation measurement of the reverse optical path and carry out logic judgment;
and 7: an upper computer connected with an STM32 singlechip counts and stores the detection data of the optical isolators to be detected in the batch, and automatic detection, sorting and recording of the optical isolators are completed;
specifically, the process of step 1 is as follows: the laser light outlet is connected with an optical switch, the setting position of the optical switch is connected with the corresponding pin of the STM32 singlechip, and the working state is controlled by the optical switch, so that the light path state can be switched by judging a preset program and a detection result;
specifically, the process of step 3 is as follows:
(3.1) the light source which is emitted from the optical switch, the polarization state of the light source is circularly polarized light, and in order to obtain linearly polarized light with the polarization direction continuously changing by 360 degrees, the linearly polarized light is arranged on an electric control rotating device which continuously rotates by 360 degrees, so that the polarization state of the light source is changed after the light source passes through the electric control rotating device;
(3.2) placing the optical isolator to be detected in a sorting tray, wherein the sorting tray is used for sorting the optical isolator into a poor product area and a good product area;
(3.3) the collimator used for coupling ensures that light in the optical fiber can be smoothly coupled into the collimator on the other side after entering the free space through the collimator on one side so as to return to the optical fiber for transmission;
specifically, the process of step 4 is as follows: the light source emitted from the optical switch enters from a Port1 of the optical fiber circulator, is emitted from a Port2 and is coupled into a free space through a collimator, and after an optical signal passing through the optical isolator to be detected is coupled back into an optical fiber through the collimator and is propagated, the optical signal enters from the Port2 of the optical fiber circulator and is emitted to a photosensitive surface of the PIN type photodiode through a Port 3; an operational amplifier and an R/C feedback network are arranged behind the PIN type photodiode; the device is used for amplifying the weak electric signal obtained by the conversion of the photodiode, and the amplified electric signal and the optical power received by the pin photodiode are in a linear relationship, so that the isolation and the insertion loss can be conveniently calculated in an electric domain;
specifically, the process of step 5 is:
(5.1) starting a PA port clock and an ADC1 clock, and setting PA1 as analog input;
(5.2) resetting the ADC1, setting ADC1 frequency division factors at the same time, initializing ADC1 parameters, setting the working mode of the ADC1 parameters to be an independent mode, setting the conversion mode to be single conversion, setting the triggering mode to be software triggering, and selecting right alignment of data;
(5.3) enabling the ADC and calibrating, configuring a regular channel parameter, starting software conversion, and reading an ADC value after the conversion is finished;
specifically, the process of step 7 is as follows: after finishing the forward reverse measurement of an optoisolator to be detected, judging the performance of the optoisolator according to a signal processing result, judging whether the optoisolator is qualified, driving a motor connected with a sorting tray to rotate, enabling the optoisolator to fall into a corresponding area, and uploading detection data of the optoisolator to an upper computer for recording and counting.
Compared with the prior art, the automatic performance detection and automatic sorting system of the free space type optical isolator has the following beneficial effects:
(1) The detection speed is higher than that of a manual detection mode, and the production cost is greatly reduced.
(2) The measuring principle is simple, the measuring precision is sufficiently ensured, and the optical isolator can be automatically sorted after detection is finished.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of the structure flow of the present embodiment.
Detailed Description
The invention will be further described with reference to the drawings and specific embodiments, which are illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1, the system structure of the system for automatically detecting and sorting the performance of the free space type optical isolator comprises a light source, an optical switch, an optical fiber circulator, a collimator, a photoelectric detector, an electric control rotating platform, a linear polarizer, a main control chip and an STM32 upper computer.
The embodiment comprises the following steps: step 1: adjusting the light output power of the semiconductor laser to a proper value, connecting a light source to an electric control optical switch, and finishing the control of the optical switch by an STM32 to ensure the normal switching of an optical path, wherein the process is as follows;
a wave plate and a depolarizer are arranged at the output end of the semiconductor laser, so that the polarization state of an output light source is ensured to be circularly polarized light, and the output power is adjusted to 20mw in consideration of the loss of optical passive devices such as the depolarizer, a circulator and a polaroid in an optical path;
the laser light outlet is connected with the optical switch, the setting position of the optical switch is connected with the corresponding pin of the STM32, and the working state is controlled by the optical switch, so that the state of the light path can be switched by the judgment of a preset program and a detection result.
Step 2: the light source is emitted from the light path switched by the optical switch and enters the free space through the collimator by the adjustment of the circulator.
And step 3: the light entering the free space sequentially passes through the polaroid and the optical isolator to be detected and is coupled into the optical fiber through the collimator at the other end, and the specific process is as follows;
the light source is emitted from the optical switch, the polarization state of the light source is circular polarization, and in order to obtain linear polarization with a polarization direction continuously changing in 360 degrees, the linear polarizer is arranged on an electric control rotating device continuously rotating in 360 degrees, so that the polarization state of the light source is changed after the light source passes through the electric control rotating device;
the optical isolator to be detected is placed on a sorting tray, and the sorting tray is used for sorting the optical isolator into a poor product area and a good product area;
collimators used for coupling at two sides need to be aligned in advance, so that light in the optical fiber can be smoothly coupled into the collimator at the other side after being incident into a free space through the collimator at one side, and then returns to the optical fiber for transmission.
And 4, step 4: the optical signal passing through the optical isolator to be detected is captured by the sensor through the adjustment of the circulator and is processed through the amplifying circuit, and the specific process is as follows;
the light source emitted from the optical switch enters from Port1 of the circulator, is emitted from Port2 and is coupled into a free space through the collimator, and after an optical signal passing through the optical isolator to be detected is coupled back into an optical fiber through the collimator and is propagated, the optical signal enters from Port2 of the circulator and is emitted to a photosensitive surface of the PIN type photodiode through Port 3;
an operational amplifier and an R/C feedback network are arranged behind the PIN type photodiode; the photoelectric conversion device is used for amplifying the weak electric signals obtained by the conversion of the photodiode, the amplified electric signals and the light power received by the pin photodiode are in a linear relation, and the isolation and the insertion loss can be conveniently calculated in an electric domain.
And 5: the processed signals are transmitted to an STM32 for AD conversion and logic judgment, and the insertion loss measurement of a forward optical path is completed;
step (5.1) starting a PA port clock and an ADC1 clock, and setting PA1 as analog input;
resetting ADC1, setting ADC1 frequency division factors, initializing ADC1 parameters and setting relevant information of a working mode and a rule sequence of the ADC1 parameters;
and (5.3) enabling the ADC and calibrating, configuring the parameters of the regular channel, starting software conversion, and reading the ADC value after the conversion is finished.
Step 6: and controlling an optical switch by the STM32 to switch the optical path, repeating the process to complete the isolation measurement of the reverse optical path and carrying out logic judgment.
And 7: an upper computer connected with STM32 counts and stores the detection data of the optical isolators to be detected in the batch, and completes the automatic detection, sorting and recording of the optical isolators;
after accomplishing a forward reverse direction measurement of waiting to examine the opto-isolator, judge this opto-isolator's performance according to the signal processing result, judge whether it is qualified, drive the tray and rotate corresponding angle by main control chip according to the detection result control step motor, make it slide in non-defective products district or inferior goods district, the motor that the drive links to each other with the letter sorting tray rotates, make this opto-isolator fall into corresponding region, upload this opto-isolator's detected data to the host computer simultaneously and take notes and make statistics of.
Compared with the traditional manual detection and sorting mode, the automatic sorting device has the advantages that the detection speed is high, the detection precision is greatly improved, meanwhile, the complete detection result can be sorted out after one batch of detection is finished, the production efficiency is improved, and the production cost is reduced.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (5)
1. The automatic performance detection and automatic sorting system for the free space type optical isolator is characterized by comprising the following steps of:
step 1: adjusting the light output power of the semiconductor laser to 20mw, connecting a light source to the electrically controlled optical switch, and controlling the optical switch by the STM32 to ensure the normal switching of the optical path;
step 2: the light source is emitted from the light path switched by the optical switch and enters the free space through the collimator after being adjusted by the circulator;
and step 3: the light entering the free space passes through the polaroid and the optical isolator to be detected in sequence, and is coupled into the optical fiber through the collimator at the other end;
the specific process of the step 3 is as follows:
(3.1) the light source which is emitted from the optical switch, the polarization state of the light source is circularly polarized light, and in order to obtain linearly polarized light with the polarization direction continuously changing by 360 degrees, the linearly polarized light is arranged on an electric control rotating device which continuously rotates by 360 degrees, so that the polarization state of the light source is changed after the light source passes through the electric control rotating device;
(3.2) placing the optical isolator to be detected in a sorting tray, wherein the sorting tray is used for sorting the optical isolator into a poor product area and a good product area;
(3.3) collimator for coupling ensures that light in the optical fiber can be smoothly coupled into the collimator on the other side after entering the free space through the collimator on one side so as to return to the optical fiber for transmission
And 4, step 4: the optical signal passing through the optical isolator to be detected is captured by the sensor through the adjustment of the circulator and is processed through the amplifying circuit;
and 5: the processed signals are transmitted to an STM32 for AD conversion and logic judgment, and insertion loss measurement of a forward optical path is completed;
step 6: the STM32 controls the optical switch to switch the optical path, and the steps 2-5 are repeated to complete the isolation measurement of the reverse optical path and carry out logic judgment;
and 7: and the upper computer connected by the STM32 counts and stores the detection data of the optical isolators to be detected in the batch, and completes automatic detection, sorting and recording of the optical isolators.
2. The automatic free-space type optical isolator performance detection and automatic sorting system according to claim 1, wherein the specific process of step 1 is as follows: the laser light outlet is connected with the optical switch, the setting position of the optical switch is connected with the corresponding pin of the STM32, and the working state is controlled by the optical switch, so that the state of the light path can be switched by the judgment of a preset program and a detection result.
3. The automatic free-space type optical isolator performance detection and automatic sorting system according to claim 1, wherein the specific process of step 4 is as follows: the light source emitted from the optical switch enters from Port1 of the optical fiber circulator, is emitted from Port2 and is coupled into a free space through the collimator, and after an optical signal passing through the optical isolator to be detected is coupled back into the optical fiber through the collimator and is propagated, the optical signal enters from Port2 of the optical fiber circulator and is emitted to a photosensitive surface of the PIN type photodiode through Port 3.
4. The automatic free-space type optical isolator performance detection and automatic sorting system according to claim 3, wherein the specific process of step 5 is as follows:
(5.1) starting a PA port clock and an ADC1 clock, and setting PA1 as analog input;
(5.2) resetting the ADC1, setting ADC1 frequency division factors at the same time, initializing ADC1 parameters, setting the working mode of the ADC1 parameters to be an independent mode, setting the conversion mode to be single conversion, setting the triggering mode to be software triggering, and selecting right alignment of data;
and (5.3) enabling the ADC and calibrating, configuring the parameters of the regular channel, starting software conversion, and reading the ADC value after the conversion is finished.
5. The automatic free-space type optical isolator performance detection and automatic sorting system according to claim 1, wherein the specific process of step 7 is as follows: after finishing the forward reverse measurement of an optoisolator to be detected, judging the performance of the optoisolator according to a signal processing result, judging whether the optoisolator is qualified, driving a motor connected with a sorting tray to rotate, enabling the optoisolator to fall into a corresponding area, and uploading detection data of the optoisolator to an upper computer for recording and counting.
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| CN1066822C (en) * | 1996-03-22 | 2001-06-06 | 北京邮电大学 | Optical fibre light isolator property tester |
| JP2004093153A (en) * | 2002-08-29 | 2004-03-25 | Kyocera Corp | Optical loss measuring method for optical fiber pigtail with optical isolator |
| US8399872B2 (en) * | 2009-12-02 | 2013-03-19 | Raytheon Company | System and method for using an optical isolator in laser testing |
| CN106338797B (en) * | 2016-11-17 | 2019-03-29 | 南京大学 | A kind of optoisolator light path system |
| CN106969905A (en) * | 2017-03-31 | 2017-07-21 | 深圳市芯思杰智能物联网技术有限公司 | Optoisolator test system |
| CN207585890U (en) * | 2017-09-05 | 2018-07-06 | 上海雍邑光电科技有限公司 | A kind of insertion loss of optoisolator sending assembly and the test device of isolation |
| CN211374005U (en) * | 2020-01-10 | 2020-08-28 | 上海雍邑光电科技有限公司 | Three-temperature test control device for optical isolator |
| CN111855153B (en) * | 2020-07-21 | 2022-06-10 | 武汉优光科技有限责任公司 | Device and method for testing isolation degree of optical isolator |
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