CN101859031A - Auxiliary adjusting instrument of light spot center of expanded narrow laser beam - Google Patents
Auxiliary adjusting instrument of light spot center of expanded narrow laser beam Download PDFInfo
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- CN101859031A CN101859031A CN201010176930.4A CN201010176930A CN101859031A CN 101859031 A CN101859031 A CN 101859031A CN 201010176930 A CN201010176930 A CN 201010176930A CN 101859031 A CN101859031 A CN 101859031A
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- 239000011810 insulating material Substances 0.000 claims description 3
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- 230000004888 barrier function Effects 0.000 description 2
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Abstract
The invention relates to an auxiliary adjusting instrument of the light spot center of an expanded narrow laser beam, belonging to the laser instrument field. The instrument is a screen which is fixed on a magnetic base by a bracket; the center of the screen is provided with a hole for penetrating the narrow light beam through, the upper part, the lower part; the left part and the right part of the screen are provided with four grooves which take the center of the screen as the symmetrical center and are mutually perpendicular, and the middle of each groove is provided with an insulating plate which divides the groove into two slits; and four photoresistors which are equal in resistivity and consistent in characteristic are across the insulating plates and slide in the slots; two pins of each photoresistor are inserted in the slits at both sides of the insulating plate; the screen is provided with a plurality of annular scales taking the center of the screen as the circle center; the edge of the screen is provided with two observation holes; two light-emitting diodes are arranged at the back sides of the observation holes; the pins of the four photoresistors are arranged at the back side of the screen and are connected into a bridge circuit, and the voltage difference of midpoints of two arms of the bridge circuit is amplified by an operational amplification circuit and an output end of the bridge circuit is connected with the light-emitting diodes. The instrument is used for judging whether the laser spot center of the laser beam expanded by a beam expander is height-equal and coaxial with the incident beam.
Description
Technical field
The present invention relates to a kind of optical experiment instrument, be specifically related to a kind of can judge quickly and intuitively that narrow laser beam expands bundle by beam expanding lens after, the center of expanding the bundle hot spot whether with the auxiliary adjustment instrument of incident ray contour coaxial, belong to optical instrument field.
Background technology
In Experiments of Optics, often the narrow laser beam of 1～2 millimeter of diameter range need be expanded the bigger hot spot of bundle acquisition through beam expanding lens, laser beam need be adjusted after expanding bundle through beam expanding lens, makes the spot center and the incident ray contour coaxial that expand after restrainting.If spot center behind the expansion bundle and incident ray be contour coaxial not, will influence the result of Experiments of Optics.Yet, judge at present the spot center that expands behind the bundle whether with the incident ray contour coaxial, still do not have instrument to detect, normally with the naked eye observe and judge, therefore, be difficult to guarantee the precision of adjusting.
Summary of the invention:
The purpose of this invention is to provide and a kind ofly can effectively reduce the error that detects by an unaided eye and caused, and judge intuitively that in optics work and related experiment whether the center of the laser facula of light beam after beam expanding lens expands bundle keeps the supplementary instrument of contour coaxial with incident ray.
Realize that the technical scheme that purpose of the present invention adopts is: this instrument comprises the screen 1 of a circle of being made by insulating material, be fixed on the optics magnetic bases by support 2, there is a screen center hole 3 that supplies narrow laser beam to pass at the center of screen 1, the upper and lower, left and right of screen are that symcenter has four mutually perpendicular grooves 4 with screen center hole 3, and the centre of each groove has a bar insulation plate 5 that each groove is divided into two seams 6; Four photoresistance 7 that resistance is equal, characteristic is consistent are on insulcrete 5, and can in the line of rabbet joint 6, slide, two pin is inserted in the seam 6 of insulcrete 5 both sides, having with the screen center on the screen 1 is some circular scales 8 in the center of circle, on the screen limit of screen 1 two viewports 10 are arranged, two light emitting diodes 9 place the back side of two viewports 10, the pin line of four photoresistance 7 places the back side of screen, and connect into bridge circuit, the voltage difference of bridge circuit two arm mid points again after operational amplification circuit amplifies, its output terminal be connected with light emitting diode 9.
For the center of circle of four residing same circumference of photoresistance guaranteeing to shield just in time is exactly the position that light pencil passes through, the interior diameter and the gap between the narrow laser beam external diameter of screen center hole 3 are the smaller the better, and the interior diameter size of preferably shielding center hole 3 equates with the external diameter of the narrow laser beam that passes therethrough.
The using method of this instrument is: the optics magnetic bases of this device are placed certain distance behind the beam expanding lens of laser beam, make the hot spot of light beam on screen 1 that expand behind the bundle just with the sizableness of screen, write down the position of beam expanding lens, take beam expanding lens away, adjust the height of position, direction and the support 2 of this device optics magnetic bases, light pencil is passed from the central circular hole 3 of screen, optical mount is fixed.Put into beam expanding lens in original position of placing beam expanding lens, light pencil is radiated on the screen 1 after beam expanding lens expands bundle, detects by an unaided eye, and the position of mobile beam expanding lens tentatively makes spot center roughly overlap with the center of screen 1.Then according to the position of expanding four photoresistance 7 of size adjustment of restrainting the back hot spot, it is bigger to make four photoresistance 7 be in radius as far as possible, and with central circular hole 3 is on the same circular scale in the center of circle, the radius that four photoresistance 7 are on the same circumference is big more, its precision is high more, and guarantees that four photoresistance 7 all can be shone by hot spot.Connect the direct supply of this device, if the center of hot spot not exclusively overlaps with the center of circle 3 of screen 1 central authorities, then the resistance of four photoresistance 7 is just unequal, two arm mid point a of the bridge circuit of four photoresistance 7 compositions, the b voltage difference is non-vanishing, after the amplifier amplification, output terminal will be high level or low level, then in two light emitting diodes 9 will be luminous, finely tune the height and the position, the left and right sides of beam expanding lens this moment again, until two light emitting diodes 9 are all not luminous, show that laser beam just keeps contour coaxial with the incident light pencil through the spot center that beam expanding lens expands after restrainting this moment.
The principle of work that this light pencil expands bundle spot center auxiliary adjustment instrument is:
The principle that the present invention has corresponding relation and bridge balance according to the resistance and the light intensity of photoresistance.Four photoresistance 7 connect into the structure (schematic diagram as shown in Figure 3) of electric bridge, if project spot center and incident ray contour coaxial on the screen behind the laser beam expanding, it is identical then to be radiated at four light intensity in the photoresistance 7, the resistance of four photoresistance 7 also equates, electric bridge reaches balance, the voltage difference of two arm mid point a, b is zero, and the input voltage of amplifier is zero, and the visible light emitting diode 9 of amplifier out is not luminous.If the center of expansion bundle back hot spot and incident ray be contour coaxial not, it is inequality then to be radiated at four light intensities in the photoresistance 7, the resistance of four photoresistance 7 is unequal, the electric bridge imbalance, the voltage difference of two arm mid points is non-vanishing, output voltage is non-vanishing after amplifier amplifies, output terminal may be that high level also may be a low level, two visible light emitting diodes 9 of output terminal must have a meeting conducting and luminous, therefore by the light on and off of light emitting diode 9 just can judge the beam center that expands after restrainting whether with the incident ray contour coaxial.
The invention has the beneficial effects as follows: because by adjusting the position of four photoresistance, whether make laser beam expand the Shu Houqi beam center through beam expanding lens can realize by the light on and off of observing light emitting diode 9 with the judgement of incident ray contour coaxial, therefore overcome the error that simply detects by an unaided eye and caused, make judged result accurately and reliably, intuitively, judge fast.
Description of drawings
Fig. 1 is the mechanical part structural drawing of this instrument:
Fig. 2 is the A-A cut-open view of Fig. 1;
Fig. 3 is the circuit interface chart of the electric elements of this instrument.
Each Reference numeral is: 1, screen, 2, support, 3, the screen center hole, 4, groove, 5, insulcrete, 6, finedraw, 7, photoresistance, 8, circular scale, 9, light emitting diode, 10, viewport.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Embodiment, it is that the narrow laser beam of 2mm expands bundle that this instrument is used for diameter, instrument comprises the screen 1 of the circle of that made by insulating material, an about 2mm of its thickness, be fixed on the optics magnetic bases by support 2, the circular hole 3 that it is 2mm that there is a diameter at the center of screen 1, the upper and lower, left and right of screen are that symcenter has four mutually perpendicular grooves 4 with screen center hole 3, and the centre of each groove has a bar insulation dividing plate 5 that each groove is divided into two seams 6; Four resistances equate, the photoresistance 7 of characteristic unanimity is on insulating barrier 5, and can in the line of rabbet joint 6, slide, two pin is inserted in the finedraw 6 of insulating barrier 5 both sides, having with the screen center on the screen 1 is some circular scales 8 in the center of circle, has 10, two light emitting diodes 9 of two viewports to place the back side of two viewports 10 on the screen limit of screen 1, after luminous component placed viewport, whether the experimenter can see luminous in the front of screen 1.The pin line of four photoresistance 7 places the back side of screen, on circuit board, connect into bridge circuit by lead, the voltage difference of bridge circuit two arm mid points is input to amplifier input terminal as input signal, shown in figure (3), the pin line and the amplifier circuit of photoresistance, comprise direct supply, operational amplifier, light emitting diode, metalfilmresistors etc. all are produced on the circuit board, circuit board is fixed on the back side of screen by the insulation anchor clamps, operational amplifier adopts op07, introduces the voltage negative feedback, makes operational amplifier be operated in the linear amplification state, the light sensitive characteristic that changes with light intensity according to the resistance value of photoresistance, determine the enlargement factor of operational amplification circuit, depart from when minimum when spot center guaranteeing that the output voltage after the operational amplifier amplification can make the light emitting diode 9 of output terminal luminous.
At first this device is placed on the place of beam expander back one segment distance in the light path, take beam expanding lens away, adjust the position of this device, laser beam is just passed from the screen center pit fully, put into beam expanding lens, make the hot spot of light beam on screen 1 that expand behind the bundle just with the sizableness of screen, synchronously regulate the position of four photoresistance according to the size of hot spot, it is bigger to make it be in radius as much as possible, and with central circular hole 3 is on the same circular scale in the center of circle, in the adjustment, guarantee that hot spot is radiated on four photoresistance 7.If the light emitting diode on the device 9 is not luminous, the center and the incident ray contour coaxial of hot spot just is described; If light emitting diode 9 is luminous, not contour coaxial of the center of hot spot and incident ray just is described.At this moment, just must adjust the height of beam expanding lens, pitching inclination angle and position, the left and right sides, not luminous until light emitting diode, like this beam expanding lens expand after restrainting hot spot just with the incoming laser beam contour coaxial.Therefore this device can intuitive judgment go out naked eyes the beam center position that can not judge.
Claims (2)
1. narrow laser beam expands bundle spot center auxiliary adjustment instrument, it is characterized in that: this instrument comprises the screen (1) of a circle of being made by insulating material, be fixed on the optics magnetic bases by support (2), there is a screen center hole (3) that supplies narrow laser beam to pass at the center of screen (1), the upper and lower, left and right of screen are that symcenter has four mutually perpendicular grooves (4) with circular hole (3), and the centre of each groove has a bar insulation plate (5) that each groove is divided into two finedraws (6); Four resistances equate, the photoresistance of characteristic unanimity (7) is on insulcrete (5), and can in the line of rabbet joint (6), slide, two pin is inserted in the finedraw (6) of insulcrete (5) both sides, having with the screen center on the screen (1) is some circular scales (8) in the center of circle, on the screen limit of screen (1) two small through hole (10) are arranged, two light emitting diodes (9) place the back side of two small through hole (10), the pin line of four photoresistance (7) places the back side of screen, and be coupled to bridge circuit, after operational amplification circuit amplified, its output terminal and photoresistance (7) connect the voltage difference of bridge circuit two arm mid points again.
2. narrow laser beam according to claim 1 expands bundle spot center auxiliary adjustment instrument, it is characterized in that: the screen center hole (3) of screen (1), its interior diameter size equates with the external diameter of the narrow laser beam that passes therethrough.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010176930.4A CN101859031A (en) | 2010-05-20 | 2010-05-20 | Auxiliary adjusting instrument of light spot center of expanded narrow laser beam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010176930.4A CN101859031A (en) | 2010-05-20 | 2010-05-20 | Auxiliary adjusting instrument of light spot center of expanded narrow laser beam |
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| CN101859031A true CN101859031A (en) | 2010-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010176930.4A Pending CN101859031A (en) | 2010-05-20 | 2010-05-20 | Auxiliary adjusting instrument of light spot center of expanded narrow laser beam |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102564298A (en) * | 2011-12-28 | 2012-07-11 | 中国科学院半导体研究所 | Method for detecting laser deviation of high-power laser optical path |
| CN103212791A (en) * | 2012-01-19 | 2013-07-24 | 昆山思拓机器有限公司 | Coaxial collimator for beam expander |
| CN103217794A (en) * | 2012-01-19 | 2013-07-24 | 昆山思拓机器有限公司 | Beam expander |
| CN106152983A (en) * | 2015-04-20 | 2016-11-23 | 陈俊杰 | A kind of device whether detecting laser bias in laser optical path |
| CN108398382A (en) * | 2018-02-05 | 2018-08-14 | 复旦大学 | Portable free optical assembly based on Quantum Design comprehensive physical property measurement systems |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1939950A1 (en) * | 1969-08-06 | 1971-02-18 | Agfa Gevaert Ag | Photographic camera, in particular reflex camera, with an electronic exposure control device |
| CN2298508Y (en) * | 1997-05-27 | 1998-11-25 | 襄樊市自动化仪表公司 | Digital display instrument |
| CN2495987Y (en) * | 2001-10-09 | 2002-06-19 | 上海宝钢化工有限公司 | Electronic type verticality and levelness telemeter |
| CN1963432A (en) * | 2006-12-13 | 2007-05-16 | 中国科学院光电技术研究所 | Hartman wave front sensor to realize alignment function by light splitter and testing method thereof |
| CN100376415C (en) * | 2000-05-25 | 2008-03-26 | 霍兰集团公司 | Height control system and sensor therefor |
-
2010
- 2010-05-20 CN CN201010176930.4A patent/CN101859031A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1939950A1 (en) * | 1969-08-06 | 1971-02-18 | Agfa Gevaert Ag | Photographic camera, in particular reflex camera, with an electronic exposure control device |
| CN2298508Y (en) * | 1997-05-27 | 1998-11-25 | 襄樊市自动化仪表公司 | Digital display instrument |
| CN100376415C (en) * | 2000-05-25 | 2008-03-26 | 霍兰集团公司 | Height control system and sensor therefor |
| CN2495987Y (en) * | 2001-10-09 | 2002-06-19 | 上海宝钢化工有限公司 | Electronic type verticality and levelness telemeter |
| CN1963432A (en) * | 2006-12-13 | 2007-05-16 | 中国科学院光电技术研究所 | Hartman wave front sensor to realize alignment function by light splitter and testing method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 《物理光学实验》 19891031 曾昭宏等 光学元件同轴等高的调试技术 22-23 1-2 , 1 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102564298A (en) * | 2011-12-28 | 2012-07-11 | 中国科学院半导体研究所 | Method for detecting laser deviation of high-power laser optical path |
| CN103212791A (en) * | 2012-01-19 | 2013-07-24 | 昆山思拓机器有限公司 | Coaxial collimator for beam expander |
| CN103217794A (en) * | 2012-01-19 | 2013-07-24 | 昆山思拓机器有限公司 | Beam expander |
| CN106152983A (en) * | 2015-04-20 | 2016-11-23 | 陈俊杰 | A kind of device whether detecting laser bias in laser optical path |
| CN108398382A (en) * | 2018-02-05 | 2018-08-14 | 复旦大学 | Portable free optical assembly based on Quantum Design comprehensive physical property measurement systems |
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Open date: 20101013 |