CN100580395C - Laser power dynamic calibration apparatus - Google Patents
Laser power dynamic calibration apparatus Download PDFInfo
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- CN100580395C CN100580395C CN200810100560A CN200810100560A CN100580395C CN 100580395 C CN100580395 C CN 100580395C CN 200810100560 A CN200810100560 A CN 200810100560A CN 200810100560 A CN200810100560 A CN 200810100560A CN 100580395 C CN100580395 C CN 100580395C
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- laser power
- protective sleeve
- reflecting drum
- light
- power dynamic
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Abstract
The invention discloses a laser power dynamic marking device. The laser power dynamic marking device is characterized in that it comprises a protection bush, the protection bush is disposed with a reflection cylinder, the protection bush and inner wall of the reflection cylinder are roughen and blackened, the side wall of the protection bush is mounted with a beam-extender lens; in light path of the beam-extender lens, two side walls of the reflection cylinders are respectively mounted with diaphragms, holes are opened on the protection bush, single-side transmission-increasing optical glass is diagonally mounted between two diaphragms on side walls of the reflection cylinder, the single-side transmission-increasing optical glass cuts the light beam by angle of 45 degree, over 96% of light beam energy is transmitted along the original light path, less than 4% of light beam energy is reflected to a convex lens parallel to the laser beam in certain distance; disposing a sampling fiber under focus point of the convex lens, in order to converge and transmit the reflected light beam therethrough so that the photomultiplier can obtain variation condition of laser power after receiving the reflected light beam.
Description
Technical field
This patent relates to the photodetection field, specifically is laser power dynamic calibration apparatus.
Background technology
As the important parameter of influence and sign particulate physical characteristics, particle shape research is subjected to increasing attention.It is the shape information that phase function is comprising particle that the scattered light intensity of particulate distributes, and application for a patent for invention " hyperchannel scattering inverting particle 3D shape detector (2007100222577) " and " based on the new equipment (200710023960.X) of image monitoring micro-particles shapes and scattering " are promptly as ultimate principle.Use the semiconductor laser of wavelength 650nm as light source in the foregoing invention patented claim, in a plurality of orientation, surface, black hollow sphere scattering chamber fiber optic hub is set rationally, through optical fiber the particle scattering light in these orientation is exported to photomultiplier, obtain the distribution situation of scattered light intensity, thus inverting particulate shape and statistical classification.
Laser power is unsettled, has 2%～5% hunting range usually.If measure the mean oscillatory cycle of required time much larger than laser power, then the vibration of laser power is negligible to result's influence; Otherwise, if the mean oscillatory cycle of measuring required time and laser power is quite or littler, the influence that experimental result is brought with regard to the vibration that must consider because of laser power, otherwise measured value will be bigger than normal or less than normal than actual value.In fact strict, every instantaneous measurement that utilizes laser beam considers that its oscillation of power all can make experimental result more accurate.The mean oscillatory cycle of 650nm semiconductor laser, aerosol particle passed through the time of light beam also in the microsecond magnitude in microsecond (μ S) magnitude, and oscillation of power need be proofreaied and correct the influence of measured value.
Summary of the invention
The purpose of this invention is to provide a kind of laser power dynamic calibration apparatus.Find out the fluctuation situation of laser general power by the light beam power of this device sampling observation about 4%, can provide foundation for the control of laser power.
Technical scheme of the present invention is as follows:
Laser power dynamic calibration apparatus; it is characterized in that: include protective sleeve; in the described protective sleeve reflecting drum is arranged; described protective sleeve and reflecting drum inwall are all handled through the roughening blackout; on the described protective sleeve sidewall beam expanding lens is installed; in the light path in described beam expanding lens the place ahead; on the two side of reflecting drum, be separately installed with diaphragm; perforate is arranged on protective sleeve; be tiltedly installed with the anti-reflection optical glass of single face between two diaphragms on the described reflecting drum sidewall; the outgoing laser beam face plating anti-reflection film of the anti-reflection optical glass of described single face; in the reflected light path of the anti-reflection optical glass of single face; the convex lens that are installed in the reflecting drum are arranged, and described concave lens focus is positioned at the port of the sampling optical fiber that is installed in reflecting drum.
Described laser power dynamic calibration apparatus is characterized in that: the dimpling lens are installed on the port of described sampling optical fiber, are positioned at the concave lens focus place.
Described laser power dynamic calibration apparatus is characterized in that: described single face anti-reflective glass is installed on the screw rod end, and described screw rod is installed in the screw at protective sleeve and reflecting drum top, and the screw rod lower end extend in the reflecting drum.
Described laser power dynamic calibration apparatus is characterized in that: in the described perforate on protective sleeve diaphragm is installed.
Described laser power dynamic calibration apparatus; it is characterized in that: described diaphragm is the circular hole diaphragm; conical light hole is wherein arranged; the aperture is 0.2-3mm; diaphragm on the described reflecting drum sidewall that is positioned at behind the anti-reflection optical glass of single face, its aperture is greater than the aperture of the diaphragm that is positioned at before the anti-reflection optical glass of protective sleeve and single face.
Described laser power dynamic calibration apparatus is characterized in that: described protective sleeve and reflecting drum are square box.
Measuring principle
Electrooptical device mainly is to utilize photoelectric effect to convert light signal to electric signal.Photomultiplier can will be converted to magnitude of voltage by force than the low light level, by the instantaneous value of measuring voltage, can obtain laser power situation over time.Represent the opto-electronic conversion voltage of laser power mean value correspondence, V with V
tThe opto-electronic conversion voltage of laser power instantaneous value correspondence, generally V ≠ V
t, but
The opto-electronic conversion voltage reflected laser beam general power that the principle of device of the present invention comes down to utilize a small amount of sampling observation light over time.Have a spot of surround lighting composition in the collected light of sampling optical fiber, but surround lighting is stable in a long time under the experiment condition, the influence that is brought by surround lighting also is stable.According to the independent action principle of light, laser instrument is closed under the condition, and what the photoelectric conversion device of this device obtained is the surround lighting corresponding voltage value, in data processing, and should be with this part deduction.If V
dFor the data value that will obtain, use V
mThe voltage measuring value of expression particle scattering light after opto-electronic conversion, then
V is the average voltage of optical fiber emergent light correspondence in the formula, v
tBe the voltage instantaneous value of optical fiber emergent light correspondence, v
eBy being surveyed the pairing part of surround lighting in the voltage.
If the pairing voltage ratio of surround lighting is minimum, as the experiment in the darkroom, carry out or the environment auroral poles a little less than etc., then above-mentioned formula can be reduced to
Above-mentioned V
dValue is the value that can be used for data processing that will obtain, and this is worth than V
mReflected the scattered intensity distribution more accurately.
Described device is made of duralumin, mainly comprises protective sleeve, reflecting drum, beam expanding lens and sampling optical fiber, and wherein reflecting drum contains anti-reflection optical glass of single face and convex lens, runs through the set screw of regulating the anti-reflection optical glass of single face between protective sleeve and the reflecting drum.
1. the processing of protective sleeve, reflecting drum and beam expanding lens support
Protective sleeve, reflecting drum and beam expanding lens support are all made of duralumin.Protective sleeve, reflecting drum are hollow rectangular column, and the peripheral length of protective sleeve is respectively 80mm, 80mm, 120mm, wall thickness 5mm; The peripheral length of reflecting drum is respectively 50mm, 50mm and 100mm, wall thickness 3mm.The beam expanding lens support is a cylinder-like structure, and outer dia is 50mm, and inside diameter designs according to requirement of experiment, and it is 3: 1 that the beam expanding lens of this device expands the beam ratio example, and the wall thickness of the beam expanding lens support of big or small convex lens correspondence is respectively 2mm and 6mm.
2. the making of circular hole diaphragm
For reduce the interference between the light as far as possible, the circular hole diaphragm is processed into cone-shaped structure, select for use duralumin to make.Select suitable taper angle so that the reflected light of circular hole diaphragm is got on the wall.Make the circular hole diaphragm in a collection of different apertures, to adapt to different requirement of experiment, the aperture of the circular hole diaphragm that this device is equipped with comprises: 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.5mm, 2.0mm, 3mm.
3. the selection of the processing of the anti-reflection optical glass of single face and convex lens
The upper and lower surface that guarantees optical glass is parallel and highly polished.The anti-reflection optical glass of the single face of this device need plate the 650nm anti-reflection film to cooperate institute's exploring laser light; Focal length of convex lens is 20mm.
4. the raising of optical fiber collection efficiency
For improving the collection efficiency of optical fiber, at its receiving end the dimpling lens have been installed, the collection area of optical fiber is expanded to about original 10 times.
5. assembling and calibration
For reducing the interference of natural light and parasitic light, the part of being made by duralumin in this device is all done the roughening blackout and is handled.In assembling process, the interface of seal protection cover and circular hole diaphragm, beam expanding lens support; The reflected light of the circular hole diaphragm that assurance and beam expanding lens are close does not enter beam expanding lens, is absorbed and all reflex on the wall.
Advantage of the present invention:
1, easy to use, beam expanding lens is placed and the diaphragm axis overlaps with beam axis and gets final product in face of light beam;
2, reduce beam divergence angle, improve beam quality;
3, do not influence the The real time measure that realizes laser energy under the prerequisite of light beam work.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Embodiment
Laser power dynamic calibration apparatus; include protective sleeve 1; in the described square box protective sleeve 1 reflecting drum 2 is arranged; described protective sleeve 1 is all handled through the roughening blackout with reflecting drum 2 inwalls; on described protective sleeve 1 sidewall beam expanding lens 3 is installed; in the light path in described beam expanding lens 3 the place aheads; on the two side of reflecting drum 2, be separately installed with diaphragm 4; 5; on protective sleeve 1, have diaphragm 6 is installed in the perforate; two diaphragms 4 on described reflecting drum 2 sidewalls; be tiltedly installed with the anti-reflection optical glass 7 of single face between 5; the outgoing laser beam face plating anti-reflection film of described single face is anti-reflection optical glass 7; in the reflected light path of single face is anti-reflection optical glass 7; the convex lens 8 that are installed in the reflecting drum are arranged, and described convex lens 8 focuses are positioned at the port of the sampling optical fiber 9 that is installed in reflecting drum 2, on the port of sampling optical fiber 9 dimpling lens 10 are installed.
Reflecting drum 2 outer walls and protective sleeve 1 inwall keeping parallelism guarantee the dead in line of circular hole diaphragm 4,5,6 and beam expanding lens 3.Positioning of rotating screw 11, order are attached to the anti-reflection optical glass 7 of single face on 45 ° of inclined-planes, its bottom perpendicular to two planes, front and back of reflecting drum 2, thereby make the bottom surface of reflected light perpendicular to reflecting drum 2.Regulate the position of convex lens 10 and sampling optical fiber 9 receiving ends, the receiving port of its focus and sampling optical fiber 9 is overlapped.
See from the beam expanding lens direction to have 4,5,6 three circular hole diaphragms that do not occur the scattered beam that the existence owing to diaphragm causes in the reflecting drum 2 in order to make, the bore that is in circular hole diaphragm 5 usually is big slightly than other two circular hole diaphragms.
Laser power dynamic calibration apparatus is placed on the direction of propagation of laser beam, makes laser beam enter by beam expanding lens 3 one sides.The one side that the anti-reflection optical glass 7 of single face is not plated anti-reflection film is in face of laser beam, and beam diameter is expanded as original 3 times behind beam expanding lens 3, and the angle of divergence of light beam reduces, more near desirable plane wave.Select suitable circular hole diaphragm to make the central part beam split of light beam enter reflecting drum 2, pass the anti-reflection optical glass 7 of single face up to the light beam more than 96%, be used for experiment, be lower than 4% light beam by the reflection of the reflecting surface of the anti-reflection optical glass 7 of single face and converge at the receiving end of sampling optical fiber 9 by convex lens 8.
The position of fine setting sampling optical fiber 9 receiving ends makes on its focus that is in convex lens 8, the light of collecting spreads out of through optical fiber, because the energy hunting scope of laser beam is little, so the main standard of selective light Denso exchange device is measurement lower limit, and what the present invention selected is high-sensitive photomultiplier.
Claims (4)
1, laser power dynamic calibration apparatus; it is characterized in that: include protective sleeve; in the described protective sleeve reflecting drum is arranged; described protective sleeve and reflecting drum inwall are all handled through the roughening blackout; on the described protective sleeve sidewall beam expanding lens is installed; in the light path in described beam expanding lens the place ahead, on the two side of reflecting drum, be separately installed with light
, perforate is arranged, two light on the described reflecting drum sidewall on protective sleeve
Between be tiltedly installed with the anti-reflection optical glass of single face, the outgoing laser beam face plating anti-reflection film of the anti-reflection optical glass of described single face, in the reflected light path of the anti-reflection optical glass of single face, the convex lens that are installed in the reflecting drum are arranged, and described concave lens focus is positioned at the port of the sampling optical fiber that is installed in reflecting drum.
2, laser power dynamic calibration apparatus according to claim 1 is characterized in that: the dimpling lens are installed on the port of described sampling optical fiber, are positioned at the concave lens focus place.
3, laser power dynamic calibration apparatus according to claim 1 is characterized in that: described single face anti-reflective glass is installed on the screw rod end, and described screw rod is installed in the screw at protective sleeve and reflecting drum top, and the screw rod lower end extend in the reflecting drum.
4, laser power dynamic calibration apparatus according to claim 1 is characterized in that: in the described perforate on protective sleeve light is installed
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810100560A CN100580395C (en) | 2008-05-12 | 2008-05-12 | Laser power dynamic calibration apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810100560A CN100580395C (en) | 2008-05-12 | 2008-05-12 | Laser power dynamic calibration apparatus |
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| CN101281058A CN101281058A (en) | 2008-10-08 |
| CN100580395C true CN100580395C (en) | 2010-01-13 |
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| CN200810100560A Expired - Fee Related CN100580395C (en) | 2008-05-12 | 2008-05-12 | Laser power dynamic calibration apparatus |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806579B (en) * | 2009-02-16 | 2012-11-21 | 华为技术有限公司 | Reflector position sampling and calibrating method and device and laser |
| CN102393247B (en) * | 2011-08-16 | 2013-07-03 | 中国兵器工业第二〇五研究所 | Calibration apparatus for laser micro energy |
| CN106840391B (en) * | 2017-02-17 | 2019-03-26 | 中国人民解放军92493部队计量测试中心 | Broadband, large range laser power meter calibrating installation |
| CN113074912B (en) * | 2021-03-26 | 2024-04-09 | 广东宏石激光技术股份有限公司 | Device and method for detecting divergence angle of laser |
| CN113791498A (en) * | 2021-09-16 | 2021-12-14 | 合肥视涯技术有限公司 | Display device and method for manufacturing the same |
| CN113805340A (en) * | 2021-09-16 | 2021-12-17 | 合肥视涯技术有限公司 | Display device and method for manufacturing the same |
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|---|---|---|---|---|
| CN86105736A (en) * | 1986-07-21 | 1987-09-16 | 北京工业学院 | A kind of power calibricating instrument for pulsed laser |
| CN2470807Y (en) * | 2001-02-13 | 2002-01-09 | 吴忠信 | improved laser calibrating instrument |
| CN1401976A (en) * | 2002-09-29 | 2003-03-12 | 中国科学院上海技术物理研究所 | Apparatus and method for measuring free electron laser optical intensity density |
| CN2735318Y (en) * | 2004-06-23 | 2005-10-19 | 中国科学院长春光学精密机械与物理研究所 | Multi-wavelength photoelectric laser power meter |
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2008
- 2008-05-12 CN CN200810100560A patent/CN100580395C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86105736A (en) * | 1986-07-21 | 1987-09-16 | 北京工业学院 | A kind of power calibricating instrument for pulsed laser |
| CN2470807Y (en) * | 2001-02-13 | 2002-01-09 | 吴忠信 | improved laser calibrating instrument |
| CN1401976A (en) * | 2002-09-29 | 2003-03-12 | 中国科学院上海技术物理研究所 | Apparatus and method for measuring free electron laser optical intensity density |
| CN2735318Y (en) * | 2004-06-23 | 2005-10-19 | 中国科学院长春光学精密机械与物理研究所 | Multi-wavelength photoelectric laser power meter |
Non-Patent Citations (3)
| Title |
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| 基于图像的纤维状颗粒的形状和散射信号检测. 邵士永，姚永帮，饶瑞中.中国粉体技术，第13卷. 2007 * |
| 气溶胶粒形光学测量技术的研究进展. 邵士勇，黄印博，姚永帮，饶瑞中.大气与环境光学学报，第3卷第1期. 2008 * |
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| CN101281058A (en) | 2008-10-08 |
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