CN202075038U - Automatic detection device for relative light intensity distribution of light diffraction - Google Patents
Automatic detection device for relative light intensity distribution of light diffraction Download PDFInfo
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- CN202075038U CN202075038U CN2011201591829U CN201120159182U CN202075038U CN 202075038 U CN202075038 U CN 202075038U CN 2011201591829 U CN2011201591829 U CN 2011201591829U CN 201120159182 U CN201120159182 U CN 201120159182U CN 202075038 U CN202075038 U CN 202075038U
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Abstract
The utility model relates to a detection device which can realize the automatic detection of light intensity distribution of an optical fiber diffraction field at different diffraction angles. The device consists of a light source system, a galvanometer, a photoelectric detection system, a signal sampling system and a signal detection and processing system, wherein the light source system is in light connection with a plane mirror in the galvanometer through a light beam; the galvanometer reflects the light beam to the photoelectric detection system through the plane mirror; the photoelectric detection system converts a received light signal into an electric signal and transmits the electric signal to the signal acquisition system through a data line; the signal acquisition system samples the signal point by point and transmits the signal to the signal detection and processing system; and finally the signal detection and processing system detects the signal and the relative light intensity distribution situations at different diffraction angles are calculated through a computer. In the device, the position of a photoelectric detector can be adjusted according to different optical fiber far field diffraction conditions, so that the measurement distance from an optical fiber to the photoelectric detector is adjusted; and thus, the diffraction light intensity distribution conditions of a light source to be detected at different diffraction angles can be detected without moving the photoelectric detection system.
Description
Technical field
The utility model relates to a kind of device that detects the light distribution of optical diffraction field, especially can realize the pick-up unit of automatic detection fiber diffractional field in the light distribution of different diffraction angle.
Background technology
Optical transmission process all has diffraction phenomena, and it is significant therefore to study diffraction of light field distribution characteristic.At present, traditional diffracted field of fiber end face light distribution detection apparatus is based on while moving photoconductor detector and slit location on the circular arc line, to realize detecting the light intensity magnitude of position, different diffraction angle.But, this traditional experimental provision needs the photodetector place to measure center of arc and light source to be measured carries out strictness to the heart, needs manual moving photoconductor position of detector during actual measurement, complicated operation has the shortcoming that measuring distance can not be adjusted according to actual conditions.
Therefore, how to overcome its complicated operation and can not adjust the deficiency of measuring distance according to actual conditions, improve the practicality of detection of diffracted light distribution device, be the problem that traditional detection fiber diffractional field light distribution device exists always.
Summary of the invention
The target of the utility model design is to regulate measuring distance according to actual conditions, and does not need manual moving photoconductor detector, just can detect the light distribution situation of testing fiber in each angle of diffraction position automatically.
The technical scheme that its technical matters that solves the utility model adopts is: device detects disposal system by light-source system, galvanometer, Photodetection system, signal sampling system and signal and constitutes, and wherein the light beam that penetrates by light-conductive optic fibre of light-source system carries out light with level crossing in the galvanometer and is connected; The level crossing of galvanometer by motor top in the system of being arranged at beam reflection to Photodetection system; Photodetection system converts the light signal of accepting to electric signal, and is transferred to signal acquiring system by data line; Signal acquiring system carries out the pointwise sampling and sends into signal detecting disposal system to signal, detects disposal system by signal more at last signal is detected, and COMPUTER CALCULATION goes out different diffraction angle relative light intensity distribution situation.
Described light-source system is to be made of the testing fiber of leaded light and optical fiber geometrical clamp, and the optical fiber geometrical clamp is the reversal of the natural order of things shape and is positioned at the device top, and testing fiber is positioned at the beginning of clip.The optical fiber geometrical clamp plays the role of positioning to optical fiber, can guarantee that optical axis that optical fiber penetrates and eyeglass rotating shaft center are on same straight line.
Described galvanometer is made of level crossing, swing motor, Drive and Control Circuit.Level crossing is positioned at the upper end of swing motor, and Drive and Control Circuit is positioned at the lower end of swing motor.The required periodic drive voltage of swing motor deflection that Drive and Control Circuit provides, this voltage can make swing motor-driven eyeglass carry out periodicity deflection repeatedly, and the deflection of one-period just scans each angle of diffraction light beam light intensity signal in the photodetector successively.
Described Photodetection system is made up of photomultiplier, slit, system handles circuit.Slit is positioned at the photomultiplier front end, and photomultiplier directly links to each other with the system handles circuit.The light beam that the slit of photomultiplier front end has guaranteed to enter photomultiplier is a clip angle light beam.Photomultiplier passes through receiving cycle light beam light intensity signal, and this light beam light intensity signal is converted into periodic electrical signal by the system handles circuit, and by in the data line input signal acquisition system.
Described signal sampling system is made up of electronic switch and delay circuit.Electronic switch carries out the time segment sampling to the periodic electrical signal of Photodetection system input, per 100 cycles are divided into a time period, the point signal of same angle of diffraction direction of phase is a sampled point weekly, and every once sampling all is input in the lock-in amplifier by data line.The sampling of per time period finishes, and starts the time lag of first order circuit, by delay circuit control electronic switch, the some signal of another angle of diffraction direction of next time period in each cycle is carried out repeated sampling again.Owing to be provided with delay circuit, the some signal site of the angle of diffraction direction of sampled point is different between the time period that makes and time period, every section sampled signal that obtains the corresponding electric signal numerical value in periodic same angle of diffraction position.
Described signal detects disposal system and is made of lock-in amplifier and computing machine.Lock-in amplifier is the reference signal that provides of the Drive and Control Circuit of the sampled signal by signal wire acknowledge(ment) signal acquisition system input and galvanometer respectively, connects by bus between lock-in amplifier and the computing machine.In the lock-in amplifier resulting cyclical signal after detecting and amplifying, be converted into the corresponding electric signal numerical value in same angle of diffraction position and the corresponding electric signal numerical value input of each angle of diffraction computing machine that will detect in, final by the numerical value that analyzes the light distribution of different diffraction angle in the computing machine, analyze the position of intensity maxima thus.
The device that the utility model is designed, under actual conditions, the position of adjustable lay the grain electric explorer (different fiber far field construction condition difference), thereby adjust the measuring distance of optical fiber to photodetector, based on eyeglass when the continuous deflection different angles, the light of corresponding angle of diffraction direction is reflexed in the photodetector, eyeglass deflection clocklike in time under the drive of swing motor, reflect into each angle of diffraction light intensity in the photodetector successively, therefore be that the some signal that time interval sampling obtains is same angle of diffraction position light intensity signal with the one-period, same point is carried out the limited number of time sampling, detect this light intensity magnitude by lock-in amplifier, by the sampling number of controlling the start-up time of delay circuit a point, successively next one point is finished sampling work then, so successively the electric signal in whole cycle is carried out the pointwise sampling and detect, realize that Photodetection system is motionless, just can treat the photometry source and survey in the distribution situation of different diffraction angle diffraction intensity.
Description of drawings
Fig. 1 is a pick-up unit structural principle block scheme.
Fig. 2 is the pick-up unit structural representation.
Fig. 3 is an embodiment index path of the present utility model.
Fig. 4 is a prediction light intensity design sketch among the embodiment.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
Among Fig. 1, the light path that light-source system penetrates by light-conductive optic fibre is carried out light with galvanometer and is connected, and galvanometer reflexes to Photodetection system by the eyeglass in the system of being arranged at light path; Photodetection system converts the light signal of accepting to electric signal, and by data line this signal is transferred to the signal sampling system electric signal is carried out the pointwise sampling, and sends into signal and detect disposal system; The COMPUTER CALCULATION that is detected in the disposal system by signal goes out the relative light intensity distribution situation of testing fiber end face diffraction at the different diffraction angle.
Among Fig. 2, the 1st, light-conductive optic fibre, light source is by the light beam in this testing fiber output directive galvanometer; The 2nd, the optical fiber geometrical clamp plays the role of positioning to light-conductive optic fibre; The 3rd, the level crossing in the galvanometer can reflect by what light-conductive optic fibre (1) was launched and treat photometry; The 4th, the swing motor in the galvanometer drives level crossing (3) according to certain frequency deflection; The 5th, the Drive and Control Circuit in the galvanometer is swung motor by the drive signal may command of its generation under the power source special power supply function; The 6th, the power source special line of galvanometer; The 7th, lock-in amplifier can receive the reference signal of galvanometer Drive and Control Circuit (5) to its input, and lock-in amplifier (7) detects sampled signal simultaneously, and sends into computing machine and carry out computational analysis; The 8th, computing machine; The 9th, electronic switch; The 10th, delay circuit; Periodic signal with the galvanometer Drive and Control Circuit carries out the pointwise sampling by delay circuit (10) control electronic switch, and in the input lock-in amplifier (7), and then the start delay circuit is sampled to the next signal point; The 11st, Photodetection system; The 12nd, outer housing box, this case are a closed lighttight casing, to avoid extraneous stray light measurement result.
In Fig. 3, the 1st, logical light optical fiber; The 3rd, the level crossing in the galvanometer; The 11st, Photodetection system.When level crossing (3) is in the MN position, center light is reflected in the Photodetection system (11), Photodetection system this moment (11) can only detect the center light intensity magnitude; When level crossing (3) under the control of swing motor counterclockwise during deflection a angle, be that to be arranged in M ' N ' be that the light of b reflects into Photodetection system (11) with angle of diffraction to level crossing (3), other direction diffracted beam then can not enter in the Photodetection system (11), it is b position light intensity magnitude that Photodetection system this moment (11) detects angle of diffraction, and the relation between b angle and a angle can be similar to regards b=2L as
1/ (L
1+ L
2) a, therefore, optical fiber different diffraction angle light intensity is reflected in the photodetector (11) successively during in the driving deflect of swinging motor when level crossing in different angles.
Predict the outcome.
According to technical solutions according to the invention and accompanying drawing 1～3 described structure, the optical diffraction relative light intensity of single-mode fiber distributed detect automatically, the effect of its detection is as shown in Figure 4.Transverse axis representation space angle of diffraction among the figure, the longitudinal axis is represented relative light intensity I/I
0, as seen along with the variation of level crossing (3) angle, the diffraction intensity of optical fiber is with the variation of space angle of diffraction rule among the figure, and wherein, diffractional field central authorities are speck, and angle of diffraction is 0 when spending, central bright spot light intensity maximum.
Claims (6)
1. optical diffraction relative light intensity distribution automatic detection device, it is characterized in that device detects disposal system by light-source system, galvanometer, Photodetection system, signal sampling system and signal and constitutes, wherein the light beam that penetrates by light-conductive optic fibre of light-source system carries out light with level crossing in the galvanometer and is connected; The level crossing of galvanometer by motor top in the system of being arranged at beam reflection to Photodetection system; Photodetection system converts the light signal of accepting to electric signal, and is transferred to signal acquiring system by data line; Signal acquiring system carries out the pointwise sampling and sends into signal detecting disposal system to signal, detects disposal system by signal more at last signal is detected, and COMPUTER CALCULATION goes out different diffraction angle relative light intensity distribution situation.
2. a kind of optical diffraction relative light intensity distribution automatic detection device according to claim 1, it is characterized in that described light-source system is that testing fiber and optical fiber geometrical clamp by leaded light constitutes, the optical fiber geometrical clamp is the reversal of the natural order of things shape and is positioned at the device top, and testing fiber is positioned at the beginning of clip.
3. a kind of optical diffraction relative light intensity distribution automatic detection device according to claim 1, it is characterized in that described galvanometer is made of level crossing, swing motor, Drive and Control Circuit, level crossing is positioned at the upper end of swing motor, Drive and Control Circuit is positioned at the lower end of swing motor, the required periodic drive voltage of swing motor deflection that Drive and Control Circuit provides.
4. a kind of optical diffraction relative light intensity distribution automatic detection device according to claim 1, it is characterized in that described Photodetection system is made up of photomultiplier, slit, system handles circuit, slit is positioned at the photomultiplier front end, and photomultiplier directly links to each other with the system handles circuit.
5. a kind of optical diffraction relative light intensity distribution automatic detection device according to claim 1, it is characterized in that described signal sampling system is made up of electronic switch and delay circuit, electronic switch carries out the time segment sampling to the periodic electrical signal of Photodetection system input, per 100 cycles are divided into a time period, the point signal of same angle of diffraction direction of phase is a sampled point weekly, per time period sampling finishes, start the time lag of first order circuit, by delay circuit control electronic switch, the some signal of another angle of diffraction direction of next time period in each cycle is carried out repeated sampling again.
6. a kind of optical diffraction relative light intensity distribution automatic detection device according to claim 1, it is characterized in that described signal detects disposal system and is made of lock-in amplifier and computing machine, lock-in amplifier is the reference signal that provides of the Drive and Control Circuit of the sampled signal by signal wire acknowledge(ment) signal acquisition system input and galvanometer respectively, connects by bus between lock-in amplifier and the computing machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201591829U CN202075038U (en) | 2011-05-18 | 2011-05-18 | Automatic detection device for relative light intensity distribution of light diffraction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201591829U CN202075038U (en) | 2011-05-18 | 2011-05-18 | Automatic detection device for relative light intensity distribution of light diffraction |
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| CN202075038U true CN202075038U (en) | 2011-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011201591829U Expired - Lifetime CN202075038U (en) | 2011-05-18 | 2011-05-18 | Automatic detection device for relative light intensity distribution of light diffraction |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313594A (en) * | 2011-05-18 | 2012-01-11 | 福建师范大学 | Detection device with different diffraction angle light intensity distributions |
| CN105527019A (en) * | 2016-01-07 | 2016-04-27 | 燕山大学 | Three-coordinate four-degree-of-freedom diffracted light intensity measuring platform |
-
2011
- 2011-05-18 CN CN2011201591829U patent/CN202075038U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313594A (en) * | 2011-05-18 | 2012-01-11 | 福建师范大学 | Detection device with different diffraction angle light intensity distributions |
| CN102313594B (en) * | 2011-05-18 | 2013-07-03 | 福建师范大学 | Detection device with different diffraction angle light intensity distributions |
| CN105527019A (en) * | 2016-01-07 | 2016-04-27 | 燕山大学 | Three-coordinate four-degree-of-freedom diffracted light intensity measuring platform |
| CN105527019B (en) * | 2016-01-07 | 2018-01-23 | 燕山大学 | A kind of three coordinate four-degree-of-freedom diffraction intensity measuring tables |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20111214 Effective date of abandoning: 20130703 |
|
| RGAV | Abandon patent right to avoid regrant |