CN104732854B - Demonstration device for simulating optical fiber numerical apertures and experiment demonstration method - Google Patents
Demonstration device for simulating optical fiber numerical apertures and experiment demonstration method Download PDFInfo
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Abstract
The invention discloses a demonstration device for simulating optical fiber numerical apertures and an experiment demonstration method. According to the demonstration device for simulating the optical fiber numerical apertures, a support and a semi-cylindrical water groove are arranged on a base, a semiconductor laser and a glass rod are arranged on the support, the outer surface of the cylindrical side wall of the semi-cylindrical water groove is sprayed with a white paint layer, and a planer side wall of the semi-cylindrical water groove is a light guide plate used for simulating an optical fiber core. The semi-cylindrical water groove is sequentially filled with distilled water, castor oil and aviation kerosene which are equal in volume and used for simulating three different kinds of optical fiber cladding from bottom to top. The experiment demonstration method adopting the experiment demonstration device is composed of the steps of simulating and demonstrating a qualitative relationship between cladding refractive indexes of an optical fiber and the refract light and the refract angle in cladding and simulating and demonstrating numbers of the cladding refractive indexes of the optical fiber and the optical fiber numerical apertures. The demonstration device is simple in structure, low in production cost, convenient to operate, visual in presentation effect and can be used for optical experiments and classroom demonstration experiments.
Description
Technical field
The invention belongs to optical experiment instrument technical field is and in particular to the experiment instrument for demonstrating fiber numerical aperture
Device.
Background technology
Optical fiber, as one of important marked achievement in high-tech, the introduction to its guide-lighting principle, extensively enters already
In the Specialized course teaching material such as middle and primary schools' textbook and College Physics, optic communication principle.Cooperation optics and optic communication principle class are taught in recent years
The experimental demonstration instrument of material, has also obtained big development.It is known that the total reflection principle based on light for the optical fiber light-guiding, but existing
Optical fiber light-guiding lecture experiment instrument and disclosed patented technology, mostly simply can be by optical signal or mould to student's demonstration optical fiber
Plan/digital electric signal is transferred to the other end from one end of optical fiber after opto-electronic conversion, and the optical fiber only demonstrating bending can pass
The fact that optical signals.Numerical aperture directly reflects the light collecting light ability of optical fiber, is one of key property parameter of optical fiber, but
Because actually used optical fiber is tiny, currently without seeing the experimental demonstration instrument being used to help that student understands numerical aperture, learn
The raw understanding for fiber numerical aperture, can only rely on imaginative power.Optical experiment instrument technical field currently need to urgently solve
One technical problem is to provide a kind of demonstration fiber numerical aperture and its experimental demonstration with fibre cladding medium refraction index relation
Instrument.
Content of the invention
A technical problem to be solved by this invention be to provide a kind of demonstrating visual, demonstrating effect substantially, can simulate
The numerical aperture of demonstration optical fiber and the analog optical fiber numerical aperture experimental demonstration device of covering medium refraction index relation.
Another technical problem to be solved by this invention is to provide a kind of experiment using analog optical fiber numerical aperture to drill
The experimental demonstration method of showing device.
Solution above-mentioned technical problem be the technical scheme is that to be provided with support and semi-cylindrical shaped tank on base,
Semiconductor laser and Glass rod be provided with support, the cylinder side wall outer surface of semi-cylindrical shaped tank be coated with white paint,
Flat sidewall is the light guide plate for analog optical fiber fibre core, is sequentially arranged with volume from bottom to top equal, mutual in semi-cylindrical shaped tank
For simulating different refractivity fibre cladding three kinds of immiscible transparency liquids, three kinds of transparency liquids from bottom to top are distillation
Water, Oleum Ricini, aerial kerosene.
The Glass rod of the present invention is located in the light exit direction of semiconductor laser, and the centrage of Glass rod is swashed with quasiconductor
Light device outgoing light direction is vertical in approximately the same plane, the centrage of Glass rod and plane-parallel.
Using the demonstration testing method of above-mentioned analog optical fiber numerical aperture experimental demonstration device, it is made up of following step:
1st, the qualitative relationships at anaclasis angle are reflected in the cladding index of analog demenstration optical fiber and covering
The laser beam transparent Glass rod of semiconductor laser outgoing, forms laser light sheet, through the trailing flank of light guide plate
Light guide plate and distilled water, Oleum Ricini, aerial kerosene different refractivity in semi-cylindrical shaped tank are slanted with same angle of incidence simultaneously
Refraction is produced on the interface of liquid and reflects, refraction light is on light guide plate with distillation water termination with refraction angle θ4Entrance distilled water,
With refraction angle θ on light guide plate with Semen Ricini oil interface2Enter Oleum Ricini, on light guide plate and aerial kerosene interface with refraction angle θ3
Enter aerial kerosene, deflecting light beams are incident upon on the white paint of semi-cylindrical shaped tank 1 cylinder side wall outer surface and form different positions
The three wire projection light belts put, enter the white paint in semi-cylindrical shaped tank cylinder side wall outer surface for the deflecting light beams of distilled water
, near light guide plate, the deflecting light beams entering Oleum Ricini are in semi-cylindrical shaped tank cylinder side wall for the wire projection light belt being formed on layer
The wire projection light being formed on the white paint of outer surface takes away light guide plate distance maximum, enters aerial kerosene deflecting light beams partly
The wire being formed on the white paint of cylindrical shape tank cylinder side wall outer surface projects light belt with the distance of light guide plate positioned at above-mentioned
Between two lines shape projection light belt, project the diverse location of light belt, the cladding index of ocular demonstration analog optical fiber by wire
With the qualitative relationships reflecting anaclasis angle in covering.
2nd, the cladding index of analog demenstration optical fiber determines the experimental technique of fiber numerical aperture
(1) measurement light guide plate and the cirtical angle of total reflection distilled in water termination
It is gradually increased incidence angle θ on light guide plate with transparency liquid interface for the laser light sheet1, laser light sheet is in leaded light
Plate and the refraction wire projection light on the cylinder side wall outer surface white paint of semi-cylindrical shaped tank for the light distilling in water termination
Band arrives first at light guide plate, and laser is initially formed total reflection on the interface with distilled water for the light guide plate, firm in wire projection light band
When disappearing well, with protractor in light guide plate upper surface Laser Measurement sheet laser the angle of incidence on light guide plate and transparency liquid interface
θ1For light guide plate and the cirtical angle of total reflection distilled in water termination.
(2) cirtical angle of total reflection on measurement light guide plate and aerial kerosene interface
Increase incidence angle θ on light guide plate with transparency liquid interface for the laser light sheet further1, laser light sheet leading
Tabula rasa is thrown with the wire on the cylinder side wall outer surface white paint of semi-cylindrical shaped tank for the light that reflects on aerial kerosene interface
Penetrate light belt and reach light guide plate, laser forms total reflection on the interface with aerial kerosene for the light guide plate, in wire projection light band just
During disappearance, with protractor in light guide plate upper surface Laser Measurement sheet laser the incidence angle θ on light guide plate and transparency liquid interface1
For the cirtical angle of total reflection on light guide plate and aerial kerosene interface.
(3) cirtical angle of total reflection on measurement light guide plate and Semen Ricini oil interface
Continue to increase incidence angle θ on light guide plate with transparency liquid interface for the laser light sheet1, laser light sheet is in leaded light
Refraction wire projection light on the cylinder side wall outer surface white paint of semi-cylindrical shaped tank for the light on plate and Semen Ricini oil interface
Band reaches light guide plate, and laser beam forms total reflection on the interface with Oleum Ricini for the light guide plate, just disappears in wire projection light band
When, with protractor in light guide plate upper surface Laser Measurement sheet laser the incidence angle θ on light guide plate and transparency liquid interface1For leading
The cirtical angle of total reflection on tabula rasa and Semen Ricini oil interface.
By the cirtical angle of total reflection of above-mentioned three kinds of liquid, by the definition of fiber numerical aperture and optical fiber maximum acceptance angle and
The relation of the cirtical angle of total reflection on fibre core and clad interface.
Na=sin α=sin (90 ° of-β1)
In formula, na is fiber numerical aperture, and α is optical fiber maximum acceptance angle, β1For light guide plate 1-1 and different transparency liquids circle
The cirtical angle of total reflection on face, intuitive judgment is with three kinds of different refractivity liquid for the fiber numerical aperture of analog optical fiber covering
Relative size.
The present invention with organic glass light guide plate for simulating fibre core, so that proportion is different, the refractive index transparent liquid that there were significant differences
Body distilled water, Oleum Ricini, aerial kerosene are analog optical fiber covering, and laser light sheet keeps same incident angles to semi-cylindrical shaped
In different solid liquid interface in tank, produce reflection and reflect, in refraction light entrance distilled water, Oleum Ricini, aerial kerosene, half
The outer surface white paint of cylindrical shape tank cylinder side wall forms three wire transmission light belts, according to the definition of fiber numerical aperture
And optical fiber maximum acceptance angle and fibre core and the relation of the cirtical angle of total reflection on clad interface, determine with three kinds of different refractivity liquid
The fiber numerical aperture of body analog optical fiber covering.This analog optical fiber numerical aperture experimental demonstration device and experimental demonstration method,
Intuitively, qualitatively demonstrate the relation of analog optical fiber cladding index size and fiber numerical aperture.Present configuration is simple, production
Cost, easy to operate, demonstrating effect are directly perceived, can be used for Experiments of Optics and Demonstrating.
Brief description
Fig. 1 is the structural representation of the embodiment of the present invention 1.
Fig. 2 is the top view of Fig. 1.
Specific embodiment
The present invention is described in more detail with reference to the accompanying drawings and examples, but the invention is not restricted to following enforcements
Example.
Embodiment 1
In Fig. 1,2, the analog optical fiber numerical aperture experimental demonstration device of the present embodiment is by semi-cylindrical shaped tank 1, white
Enamelled coating 2, Glass rod 3, semiconductor laser 4, support 5, base 6 connection are constituted.
Being fixedly connected with screw threads for fastening connector on base 6 has support 5, and support 5 is provided with semiconductor laser 4 He
Glass rod 3, Glass rod 3 is located in the light exit direction of semiconductor laser 4, the centrage of Glass rod 3 and plane-parallel, glass
The centrage of glass rod 3 is vertical in approximately the same plane with semiconductor laser 4 outgoing light direction, and semiconductor laser 4 is used for producing
Raw laser, is the light source of the present invention, and semiconductor laser 4 can rotate or mobile on support 5, rotates semiconductor laser 4, can
Change the exit direction of laser.Semi-cylindrical shaped tank 1 is placed with base 6, semi-cylindrical shaped tank 1 is located at the front of support 5, half
Cylindrical shape tank 1 is made using lucite, is transparent sink, and the cylinder side wall outer surface of semi-cylindrical shaped tank 1 is coated with white
Colored paint layer 2, the flat sidewall of semi-cylindrical shaped tank 1 is light guide plate 1-1, and light guide plate 1-1 is used for analog optical fiber fibre core, light guide plate 1-
1 each face is smooth transparent surface, and the thickness of light guide plate 1-1 is 5cm.It is sequentially arranged with body from bottom to top in semi-cylindrical shaped tank 1
Long-pending equal, immiscible and refractive index three kinds of transparency liquids that there were significant differences, from bottom to top three kinds of the present embodiment employing
Transparency liquid is distilled water, Oleum Ricini, aerial kerosene, and three kinds of transparency liquids are used for the bag of three kinds of different refractivities of analog optical fiber
Layer.By the laser beam transparent Glass rod 3 of semiconductor laser 4 outgoing, form laser light sheet, laser light sheet is from light guide plate 1-
1 trailing flank is made simultaneously incident on the interface of transparency liquid in light guide plate 1-1 and semi-cylindrical shaped tank 1, and laser light sheet is being led
Projection light belt on transparency liquid interface in tabula rasa 1-1 and semi-cylindrical shaped tank 1 and horizontal plane, laser light sheet is in leaded light
Reflection and refraction is produced, deflecting light beams enter in transparency liquid on plate 1-1 and the interface of transparency liquid in semi-cylindrical shaped tank 1.
Incidence angle θ on light guide plate 1-1 with transparency liquid interface for the laser light sheet1Adjustable, due to the refractive index of three kinds of transparency liquids
Dramatically different, laser light sheet forms the different deflecting light beams in refraction angle, the different deflecting light beams in refraction angle in three kinds of liquid
Project on the cylinder side wall outer surface white paint 2 of semi-cylindrical shaped tank 1, present the wire projection light belt of diverse location.
It is gradually increased laser light sheet incidence angle θ1, observe the situation of movement to light guide plate 1-1 for the wire projection light band, first moves to
Light guide plate 1-1 and the wire that just disappears project be initially formed on light guide plate 1-1 corresponding to light belt and transparency liquid interface complete
Reflection, observes the incidence angle θ of at this moment laser light sheet on the upper surface of light guide plate 1-11, as corresponding light guide plate 1-1
With the cirtical angle of total reflection on transparency liquid interface.Continue to increase laser light sheet incidence angle θ1, successively observation light guide plate 1-1 with
The cirtical angle of total reflection on other two kinds of transparency liquid interfaces.Using the cirtical angle of total reflection on the different solid interface obtaining,
Definition according to fiber numerical aperture, you can obtain with lucite for simulating fibre core, with distilled water, Oleum Ricini, aerial kerosene
The transparency liquid of three kinds of different refractivities is the different fiber numerical aperture of simulation covering.By above-mentioned dynamic demonstration process with entirely
The measurement of reflection critical angle, directly perceived, clearly demonstration analog optical fiber cladding index size and fiber numerical aperture be qualitatively
Relation.
Experimental demonstration method and step using above-mentioned analog optical fiber numerical aperture experimental demonstration device is as follows:
1st, the qualitative relationships at anaclasis angle are reflected in the cladding index of analog demenstration optical fiber and covering
As shown in Figure 1, 2, after the laser beam transparent Glass rod 3 of semiconductor laser 4 outgoing, become laser light sheet, swash
The trailing flank that light sheet laser passes through light guide plate 1-1 slants light guide plate 1-1 three kind different refractions interior from semi-cylindrical shaped tank 1 simultaneously
Reflection is produced on the interface of the transparency liquid of rate and reflects, three kinds of transparency liquids from bottom to top are distilled water, Oleum Ricini, aviation
Kerosene, observes downwards the deflecting light beams transparency liquid from the top of device, you can see the same incidence angle θ shown in Fig. 21's
Incident illumination, has the refraction light at different refraction angles, refraction light is in light guide plate 1-1 and distillation in the transparency liquid of different refractivity
With refraction angle θ in water termination4Enter distilled water, on light guide plate 1-1 and Semen Ricini oil interface with refraction angle θ2Enter Oleum Ricini,
With refraction angle θ on light guide plate 1-1 and aerial kerosene interface3Enter aerial kerosene, the deflecting light beams at different refraction angles are incident upon half
So that it may see the wire projection light belt of diverse location on the cylinder side wall outer surface white paint 2 of cylindrical shape tank 1.It is located at half
The refractive index of the distilled water of cylindrical shape tank 1 bottom is 1.332, same incidence angle θ1Laser light sheet, in distilled water
Refraction angle θ4Maximum, the wire projection light belt being formed on the cylinder side wall outer surface white paint 2 of semi-cylindrical shaped tank 1,
Near light guide plate 1-1；Oleum Ricini refractive index positioned at semi-cylindrical shaped tank 1 middle part is 1.483, same incidence angle θ1Laser piece
Light source, the refraction angle θ in Oleum Ricini2Minimum, forms on the cylinder side wall outer surface white paint 2 of semi-cylindrical shaped tank 1
Wire projection light belt, from light guide plate 1-1 with a distance from maximum；Refractive index positioned at semi-cylindrical shaped tank 1 top aerial kerosene is
1.436, same incidence angle θ1Laser light sheet, the refraction angle θ in aerial kerosene3Also θ in Oleum Ricini2With distilled water
In refraction angle θ4Between, the wire projection light of formation on the cylinder side wall outer surface white paint 2 of semi-cylindrical shaped tank 1
Band, with a distance from light guide plate 1-1 also between above-mentioned two lines shape projection light belt.Project the different positions of light belt by wire
Put, intuitively assume the refraction light at the middle difference refraction angle of different refractivity transparency liquid.
By above-mentioned demonstration, can clearly find out, same incidence angle θ1Laser light sheet, with light guide plate 1-1 as mould
Plan fibre core, different refractivity transparency liquid are that the refraction angle on the interface of simulation covering is different, and liquid refractivity and light guide plate
The refractive index difference of 1-1 is bigger, then the refraction angle of the refraction light in respective liquid is bigger, the ocular demonstration bag of analog optical fiber
The qualitative relationships at deflecting light beams refraction angle in layer refractive index and covering.
2nd, the cladding index of analog demenstration optical fiber determines the experimental technique of fiber numerical aperture
(1) measurement light guide plate 1-1 and the cirtical angle of total reflection distilled in water termination
In Fig. 1,2, it is gradually increased incidence angle θ on light guide plate 1-1 with transparency liquid interface for the laser light sheet1,
Refraction light on light guide plate 1-1 with distillation water termination for the laser light sheet is seen, in the cylindrical side of semi-cylindrical shaped tank 1 in Fig. 1
Wire projection light band on wall outer surface white paint 2 arrives first at light guide plate 1-1, and that is, laser is in light guide plate 1-1 and distilled water
Interface on be initially formed total reflection.When wire projection light belt just disappears, with protractor in light guide plate 1-1 upper table planar survey
At this moment incidence angle θ on light guide plate 1-1 with transparency liquid interface for the laser light sheet1, as light guide plate 1-1 with distillation water termination
On the cirtical angle of total reflection.
(2) cirtical angle of total reflection on measurement light guide plate 1-1 and aerial kerosene interface
In Fig. 1,2, increase incidence angle θ on light guide plate 1-1 with transparency liquid interface for the laser light sheet further1,
See refraction light on light guide plate 1-1 with aerial kerosene interface for the laser light sheet in FIG, in the circle of semi-cylindrical shaped tank 1
Wire projection light band on post wall outer surface white paint 2 reaches light guide plate 1-1, and that is, laser is in light guide plate 1-1 and aviation coal
Total reflection is formed on the interface of oil.When wire projection light belt just disappear when, with protractor light guide plate 1-1 upper table planar survey this
When incidence angle θ on light guide plate 1-1 and transparency liquid interface for the laser light sheet1It is light guide plate 1-1 and aerial kerosene interface
On the cirtical angle of total reflection.
(3) cirtical angle of total reflection on measurement light guide plate 1-1 and Semen Ricini oil interface
In Fig. 1,2, continue to increase incidence angle θ on light guide plate 1-1 with transparency liquid interface for the laser light sheet1,
Refraction light on light guide plate 1-1 with Semen Ricini oil interface for the laser light sheet is seen, in the cylindrical side of semi-cylindrical shaped tank 1 in Fig. 1
Wire projection light band on wall outer surface white paint 2 reaches light guide plate 1-1, and that is, laser beam is in light guide plate 1-1 and Oleum Ricini
Total reflection is formed on interface.When wire projection light belt just disappears, at this moment swashed in light guide plate 1-1 upper table planar survey with protractor
Incidence angle θ on light guide plate 1-1 with transparency liquid interface for the light sheet laser1For being all-trans in light guide plate 1-1 and Semen Ricini oil interface
Penetrate critical angle.
By the cirtical angle of total reflection in above-mentioned three kinds of solid liquid interfaces, receive greatly most by the definition and optical fiber of fiber numerical aperture
The relation of the cirtical angle of total reflection on optic angle and fibre core and clad interface:
Na=sin α=sin (90 ° of-β1)
In formula, na is fiber numerical aperture, and α is optical fiber maximum acceptance angle, β1For light guide plate 1-1 and different transparency liquids circle
The cirtical angle of total reflection on face, can intuitively find out the optical fiber numerical aperture with three kinds of different refractivity liquid for analog optical fiber covering
The relative size in footpath.
By above-mentioned presentation process, can clearly find out, in the case that fiber core refractive index determines, the refractive index of clad material
Less, then the numerical aperture of optical fiber is bigger；The refractive index of clad material is bigger, then the numerical aperture of optical fiber is less.
Claims (3)
1. a kind of analog optical fiber numerical aperture experimental demonstration device it is characterised in that: be provided with base (6) support (5) and
Semi-cylindrical shaped tank (1), support (5) is provided with semiconductor laser (4) and Glass rod (3), the circle of semi-cylindrical shaped tank (1)
Post wall outer surface is coated with white paint (2), flat sidewall is light guide plate (1-1) for analog optical fiber fibre core, semicircular cylinder
Be sequentially arranged with from bottom to top in shape tank (1) volume equal, immiscible for simulating different refractivity fibre cladding three
Plant transparency liquid, three kinds of transparency liquids from bottom to top are distilled water, Oleum Ricini, aerial kerosene.
2. analog optical fiber numerical aperture experimental demonstration device according to claim 1 it is characterised in that: described Glass rod
(3) it is located in the light exit direction of semiconductor laser (4), the centrage of Glass rod (3) and semiconductor laser (4) emergent light
Direction is vertical in approximately the same plane, the centrage of Glass rod (3) and plane-parallel.
3. a kind of usage right requires the demonstration testing method of the analog optical fiber numerical aperture experimental demonstration device described in 1, and it is special
Levy and be to be made up of following step:
(1) qualitative relationships at anaclasis angle are reflected in the cladding index of analog demenstration optical fiber and covering
The laser beam transparent Glass rod (3) of semiconductor laser (4) outgoing, forms laser light sheet, through light guide plate (1-1)
Trailing flank slants light guide plate (1-1) and the interior distilled water of semi-cylindrical shaped tank (1), Oleum Ricini, aviation with same angle of incidence simultaneously
On the interface of kerosene different refractivity liquid produce refraction and reflect, refraction light light guide plate (1-1) with distillation water termination on
Refraction angle (θ4) enter distilled water, in light guide plate (1-1) and Semen Ricini oil interface with refraction angle (θ2) enter Oleum Ricini, in leaded light
With refraction angle (θ on plate (1-1) and aerial kerosene interface3) entering aerial kerosene, deflecting light beams are incident upon semi-cylindrical shaped tank (1)
The upper three wire projection light belts forming diverse location of the white paint (2) of cylinder side wall outer surface, enter the refraction of distilled water
Light beam semi-cylindrical shaped tank (1) cylinder side wall outer surface the upper wire projection light belt being formed of white paint (2) near leading
Tabula rasa (1-1), the deflecting light beams entering Oleum Ricini are on the white paint (2) of semi-cylindrical shaped tank (1) cylinder side wall outer surface
The wire projection light being formed takes away light guide plate (1-1) distance maximum, enters aerial kerosene deflecting light beams in semi-cylindrical shaped tank (1)
The upper wire being formed of the white paint (2) of cylinder side wall outer surface projects light belt and is located at above-mentioned two with the distance of light guide plate (1-1)
Bar wire projection light belt between, by wire project light belt diverse location, the cladding index of ocular demonstration analog optical fiber with
The qualitative relationships at anaclasis angle are reflected in covering；
(2) cladding index of analog demenstration optical fiber determines the experimental technique of fiber numerical aperture
1. measurement light guide plate (1-1) and the cirtical angle of total reflection distilled in water termination
It is gradually increased angle of incidence (θ on light guide plate (1-1) with transparency liquid interface for the laser light sheet1), laser light sheet is being led
Tabula rasa (1-1) and the refraction light distilling in water termination are on cylinder side wall outer surface white paint (2) of semi-cylindrical shaped tank (1)
Wire projection light band arrive first at light guide plate (1-1), laser is initially formed complete on the interface of light guide plate (1-1) and distilled water
Reflection, when wire projection light band just disappears, with protractor in light guide plate (1-1) upper surface Laser Measurement sheet laser in leaded light
Angle of incidence (θ on plate (1-1) and transparency liquid interface1) it is light guide plate (1-1) and the cirtical angle of total reflection distilled in water termination；
2. the cirtical angle of total reflection in measurement light guide plate (1-1) and aerial kerosene interface
Increase angle of incidence (θ on light guide plate (1-1) with transparency liquid interface for the laser light sheet further1), laser light sheet exists
Refraction light on light guide plate (1-1) and aerial kerosene interface is in the cylinder side wall outer surface white paint of semi-cylindrical shaped tank (1)
(2) the wire projection light band on reaches light guide plate (1-1), and laser forms complete on the interface with aerial kerosene for the light guide plate (1-1)
Reflection, when wire projection light band just disappears, with protractor in light guide plate (1-1) upper surface Laser Measurement sheet laser in leaded light
Angle of incidence (θ on plate (1-1) and transparency liquid interface1) critical with the total reflection on aerial kerosene interface for light guide plate (1-1)
Angle；
3. the cirtical angle of total reflection in measurement light guide plate (1-1) and Semen Ricini oil interface
Continue to increase angle of incidence (θ on light guide plate (1-1) with transparency liquid interface for the laser light sheet1), laser light sheet is being led
Refraction light on tabula rasa (1-1) and Semen Ricini oil interface is on cylinder side wall outer surface white paint (2) of semi-cylindrical shaped tank (1)
Wire projection light band reach light guide plate (1-1), laser beam forms total reflection on the interface of light guide plate (1-1) and Oleum Ricini,
When wire projection light band just disappears, with protractor in light guide plate (1-1) upper surface Laser Measurement sheet laser in light guide plate (1-
1) angle of incidence (θ and on transparency liquid interface1) for the cirtical angle of total reflection in light guide plate (1-1) and Semen Ricini oil interface；
By the cirtical angle of total reflection of above-mentioned three kinds of liquid, by definition and optical fiber maximum acceptance angle and the fibre core of fiber numerical aperture
Relation with the cirtical angle of total reflection on clad interface:
Na=sin α=sin (90 ° of-β1)
In formula, na is fiber numerical aperture, and α is optical fiber maximum acceptance angle, β1For light guide plate (1-1) from different transparency liquid interfaces
The cirtical angle of total reflection, intuitive judgment is relative for the fiber numerical aperture of analog optical fiber covering with three kinds of different refractivity liquid
Size.
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| CN203689792U (en) * | 2014-01-24 | 2014-07-02 | 太原师范学院 | Demonstration instrument for light diffraction experiments |
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| CN103093675A (en) * | 2013-01-14 | 2013-05-08 | 青岛大学 | Simulated optical fiber demonstrating device |
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| CN203689792U (en) * | 2014-01-24 | 2014-07-02 | 太原师范学院 | Demonstration instrument for light diffraction experiments |
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