CN105092529B - The measurement apparatus and its measuring method of medium refraction index - Google Patents
The measurement apparatus and its measuring method of medium refraction index Download PDFInfo
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- CN105092529B CN105092529B CN201510585549.6A CN201510585549A CN105092529B CN 105092529 B CN105092529 B CN 105092529B CN 201510585549 A CN201510585549 A CN 201510585549A CN 105092529 B CN105092529 B CN 105092529B
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Abstract
The present invention relates to the measurement apparatus of medium refraction index and its measuring method, measurement apparatus includes collimated light source, first diaphragm, second diaphragm, circular turntable, stepper motor, signal processor and regulation light source, stepper motor connects signal processor and turntable, turntable center sets jack-post, jack-post is provided with the circular stage for placing testing medium, testing medium is with can survey the wedge prism of drift angle, horizontal plane residing for the vertical circular stage in the residing side in a drift angle side of drift angle can be surveyed, the diameter of the parallel circular stage in drift angle side, the turntable center of circle and the center of circle of circular stage are located on same vertical axis, measuring arm is set on turntable, detector and GaF are set in measuring arm2Lens, detector connection signal processor, light launch hole, the light hole of the first diaphragm, the light hole of the second diaphragm, the slit of testing medium and detector are on same level axis.It is capable of the refractive index of high-acruracy survey medium using the measurement apparatus and measuring method.
Description
Technical field
The present invention relates to measurement apparatus and its measurement side of the fields of measurement of refractive index, more particularly to a kind of medium refraction index
Method.
Background technology
Refractive index as the important parameter in the fields such as Optical System Design, fiber optic materials development and gemstone testing it
One, there is important practical significance in field of measuring technique.Especially in Optical System Design and fiber optic materials development field,
The refractive index of accurate measurement medium and optical fiber, is particularly weighed for Exact Design optical system and the quality for understanding fiber products
Will.
In refractometry field, more is entered using traditional critical angle method, the method for minimum deviation angle or interferometric method
Row measurement.However, traditional refractive index measurement method still has some shortcomings part：For example, using the method for minimum deviation angle, such as
Fruit needs the refractive index of high-acruracy survey sample, then needs that sample is processed into triangular prism using high process technology
Angle, undoubtedly adds equipment cost；When critical angle method measures refractive index, then the refractive index of testing sample is needed to be necessarily less than standard
The refractive index of sample, to meet the condition of critical angle, and all band high index of refraction standard sample material is rare and involves great expense, and makes
Obtain measurement range to be severely limited, especially the precise decreasing when measuring solid dielectric.
The content of the invention
Primary technical problem to be solved by this invention be for above-mentioned prior art provide it is a kind of can be to the folding of medium
Penetrate the measurement apparatus that rate carries out the medium refraction index of high-acruracy survey.
Further technical problem to be solved by this invention is to provide one kind for above-mentioned prior art to utilize above-mentioned medium
The measurement apparatus of refractive index measures the measuring method of medium refraction index.
The present invention solve technical scheme that above-mentioned primary technical problem used for：The measurement apparatus of medium refraction index, its
It is characterised by, including the collimated light source with light launch hole, the first diaphragm, the second diaphragm, circular turntable, stepping electricity
Machine, signal processor and the visible laser source of calibration, the turntable are connected at stepper motor, stepper motor connection signal
Device is managed, the center of turntable is provided perpendicular to the jack-post of horizontal plane residing for turntable, and jack-post is provided with placement testing medium
Circular stage, the testing medium is can survey the wedge prism of drift angle, the drift angle side institute for surveying drift angle with one
The side at place is perpendicular to the horizontal plane residing for the circular stage, and the diameter of the parallel circular stage in the drift angle side,
Be provided with the circular stage regulation circular stage oscilaltion adjusting knob, and the circular stage parallel to
Horizontal plane residing for turntable, the center of circle of the turntable and the center of circle of the circular stage are located on same vertical axis, institute
State to be additionally provided with turntable and the detector and converged light that obtain intensity of illumination are provided with length-adjustable measuring arm, measuring arm
The GaF of line2Lens, the detector is connected with signal processor, the light launch hole, the light hole of the first diaphragm, second
The slit of the light hole of diaphragm, testing medium and detector is on same level axis, the GaF2Lens are located at described
Between the slit of testing medium and the detector, and the slit of the detector is located at GaF2At one times of focal length of lens.
Selectively, the detector is thermistor detector or infrared light-sensitive detector or photoelectron molded line formation detector
Or silicon photocell detector.
Selectively, the collimated light source is the narrow spaces light source of laser or Wavelength tunable.
A kind of measuring method that medium refraction index is measured using above-mentioned measurement apparatus, it is characterised in that successively including as follows
Step：
(1) collimated light source, adjustment measuring arm and detector are opened, makes light launch hole, the light hole of the first diaphragm, second
The slit of the light hole of diaphragm, circular stage axis and detector is on same level axis；
(2) drift angle of wedge shape testing medium is determinedAnd by drift angleThe residing side in a drift angle side be vertically disposed in
On circular stage, and the diameter of the parallel circular stage in the drift angle side is made, residing for another drift angle side for adjusting drift angle
Side in light launch hole out incident ray, reduce circular stage, make testing medium upper surface be less than by
The horizontal line that first diaphragm, the second diaphragm are determined；
(3) signal processor real-time synchronization pick-up probe transmission come intensity of illumination data and stepper motor forward direction
Number of pulses, and storage intensity of illumination data and the direct impulse quantity of stepper motor correspondingly；After stepper motor is powered,
The position for marking current turntable is zero point φ0；
(4) stepper motor, enabling signal processor and stepper motor are reversely adjusted, the folding estimated is set by signal processor
Penetrate light deviation angle Δ and initial zero φ0, the circular turntable of order slowly rotates, and drives measuring arm synchronously to turn by turntable
It is dynamic, wherein, the rotation deviation angle φ of direct impulse quantity m and turntable received by the stepper motormBetween correspondence
Relation is：
Wherein, φmWhen the direct impulse number that expression stepper motor is received is m, the deviation angle that turntable correspondence is turned over；
When M represents that turntable rotates 360 °, the umber of pulse required for stepper motor；
(5) deviation angle φ that turntable is rotated is treatedmThe half for estimating deviation angle Δ is reached, i.e.,When, then it is circular to carry
Thing platform rises, and makes turntable rotate its deviation angle φ by signal processormAngle value Δ, i.e. φ are inclined to estimatingmDuring=Δ,
Turntable stops operating；
(6) all intensity of illumination data that signal processor is stored according to step (4) into step (5), obtain illumination strong
Maximum two values E in degrees of data1、E2, and obtain simultaneously respectively to should two maximum intensity of illumination data stepper motor
The direct impulse number m received1、m2；
(7) the direct impulse number for calculating stepper motor is respectively m1、m2When, the deviation angle turned over corresponding to turntable
φm1、φm2：Wherein,
(8) according to the drift angle of the testing medium of acquisitionThe deviation angle φ that turntable correspondence is turned overm1、φm2, and angle
Corresponding relation is spent, the refractive index n of testing medium is calculated1：
(9) signal processor makes stepper motor rotate backward, and drives turntable to reversely rotate, again by signal processor
Real-time synchronization pick-up probe transmission intensity of illumination data and stepper motor umber of pulse, and one by one store intensity of illumination number
According to the umber of pulse with corresponding stepper motor；
(10) it is gradually increased to when turntable is rotated to intensity of illuminationWhen, then stepper motor rotating speed is reduced, slows down rotation
The rotary speed of turntable, and recorded by signal processor, storing now corresponding all intensity of illumination data and stepper motor just
To umber of pulse；
Gradually decreased to when turntable is rotated to intensity of illuminationWhen, then increase stepper motor rotating speed, spin up platform
Rotary speed, recorded by signal processor, store now corresponding all intensity of illumination data and stepper motor direct impulse
Number；
(11) it is when turntable is rotated to stepper motor direct impulse numberIt is during corresponding position, then circular
Objective table declines, and testing medium is departed from the stop to light；
(12) it is gradually increased to when turntable is rotated to intensity of illuminationWhen, then stepper motor rotating speed is reduced, slows down rotation
The rotary speed of turntable, and recorded by signal processor, storing now corresponding all intensity of illumination data and stepper motor just
To umber of pulse；
Gradually decreased to when turntable is rotated to intensity of illuminationWhen, then increase stepper motor rotating speed, spin up platform
Rotary speed, make the dead-center position that turns in step (4) of turntable rotation, and recorded by signal processor, store this time
Corresponding all intensity of illumination data and stepper motor direct impulse number in section；
(13) all intensity of illumination data that signal processor is stored according to step (9) into step (12), are obtained successively
Forward and backward maximum two values E in intensity of illumination data3、E4, and obtain simultaneously respectively to should two maximum intensity of illumination numbers
According to stepper motor direct impulse number m3、m4；
(14) the direct impulse number for calculating stepper motor is respectively m3、m4When, the deviation angle that turntable correspondence is turned over
φm3、φm4：
(15) according to the drift angle of the testing medium of acquisitionThe deviation angle φ that turntable correspondence is turned overm3、φm4, and
Angle corresponding relation, calculates the refractive index n of testing medium respectively2：
(16) n times are performed successively to operation of the step (4) into step (15), the refractive index number of 2N testing medium is obtained
It is worth (n1,n2,n3,n4,…,n2N), and the average value of 2N testing medium refractive index is calculated respectivelyWith variance δ：
Wherein, niRepresent the refractive index value for i-th of testing medium that calculating is obtained；
(17) average value of the testing medium refractive index obtained according to being calculated in step (16)With variance δ, it is situated between to be measured
The average value of matter refractive indexWith variance δ's and/or difference as testing medium actual refractive index n：Wherein,
Further, the measuring method of the measurement medium refraction index also includes exchanging different collimated light sources, and successively
Perform the step of being operated in step (2) to step (17).
Compared with prior art, the advantage of the invention is that：In light launch hole, the light hole of the first diaphragm, the second light
The light hole of door screen, the slit of testing medium and detector are in after same level axis, utilize stepper motor to drive turntable
Rotate, signal processor receives corresponding relation and the spy between umber of pulse and the turntable rotation deviation angle according to stepper motor
The light intensity data that device is received are surveyed, synchronously, stepper motor umber of pulse and intensity of illumination data are stored correspondingly, and
Two maximum intensity of illumination data are obtained by signal processor, then according to the angle between testing medium, circular stage
Relation, acquires the refractive index of testing medium first；Then detector is reversely rotated with turntable, and by signal processor
Former and later two maximum intensity of illumination data are obtained again, and obtain the refractive index of testing medium under this state again；And so on
Circulation for several times, obtains a series of refractive index data of testing mediums；Finally, using statistical method, this series refraction is obtained
The average value and variance of rate data, so as to be accurately obtained the actual refractive index of testing medium.
Brief description of the drawings
Fig. 1 is the measurement apparatus structural representation of medium refraction index in the embodiment of the present invention；
Fig. 2 is the set location schematic diagram of circular stage and testing medium in measurement apparatus shown in Fig. 1；
Fig. 3 is the schematic diagram of testing medium in Fig. 2；
Fig. 4 is the front schematic view of the first diaphragm in measurement apparatus shown in Fig. 1；
Fig. 5 is turntable forward direction choosing when turning, incident ray reflected through testing medium after schematic diagram；
Fig. 6 is turntable reversely choosing when turning, incident ray reflected through testing medium after schematic diagram.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
As shown in Figures 1 to 4, in the embodiment of the present invention medium refraction index measurement apparatus, including collimated light source 1, first
Diaphragm 2, the second diaphragm 3, circular turntable 4, stepper motor 5, signal processor 6 and the visible laser source 7 of calibration, it is accurate
There is light launch hole 10, the connection stepper motor 5 of turntable 4, stepper motor 5 connects signal processor 6 on direct light source 1, wherein,
Stepper motor 5 drives turntable 4 to rotate after the pulse that signal processor 6 is sent is received；The center of turntable 4 is provided with axle
Post 40, the jack-post 40 is provided with circular stage 41, circular stage 41 perpendicular to the horizontal plane residing for turntable 4, jack-post 40
For placing testing medium 8, wherein, the testing medium 8 is that can survey the wedge prism of drift angle with one, such as testing medium 8
Drift angle can be surveyed in Fig. 3This can survey drift angleA drift angle side AB residing for side ABDE perpendicular to the institute of circular stage 41
The horizontal plane at place, and the drift angle side AB is parallel to the diameter GH of circular stage 41, can now ensure to contact on the ABDE of side
The side DE of circular stage 41 is provided with the circular loading of regulation by the diameter GH of circular stage 41 on circular stage 41
The adjusting knob 410 of the oscilaltion of platform 41, and circular stage 41 is parallel with the horizontal plane residing for turntable 4, turntable 4
The center of circle of the center of circle and circular stage 41 be located on same vertical axis, to ensure that circular stage 41 is rotated with turntable 4
When, both, which remain, rotates coaxially；Measuring arm 42, the adjustable length of measuring arm 42, with maximum limit are additionally provided with turntable 4
Improve the resolution ratio that measurement turntable 4 turns over angle in degree ground；Detector 420 and GaF are provided with measuring arm 422Lens 421,
Detector 420 connects signal processor 6, and detector 420 irradiates the intensity of illumination of refracted light in its surface to gather,
And send signal processor 6 to；GaF2Scattered refracted light after lens 421 are then used for being reflected through testing medium 8 is converged
Afterwards, the light after convergence is made to be radiated at the slit of detector 420；Meanwhile, light launch hole 10, the first light of collimated light source 1
Light hole, the light hole of the second diaphragm 3, the slit of testing medium 8 and detector 420 of door screen 2 are on same level axis,
To ensure measurement apparatus under initial unmeasured state, incident ray shines after can sequentially passing through the first diaphragm 2 and the second diaphragm 3
It is mapped on testing medium 8, and is radiated at after the refraction of testing medium 8 on detector 420；Wherein, GaF2Lens 421 are located to be measured
Between the slit of medium 8 and detector 420, and the slit of detector 420 is located at GaF2At one times of focal length of lens 421.Wherein,
Visible laser source 7 is used to determine before work formally starts, light hole, the light hole of the second diaphragm 3 to the first diaphragm 2,
Whether the slit of testing medium 8 and detector 420 is in is calibrated on same level axis, to ensure that incident ray can
It is radiated at straight on testing medium 8.According to measurement needs, detector 420 can select to use thermistor detector or infrared photosensitive
Detector or photoelectron molded line formation detector or silicon photocell detector.
It can be selected to measure the collimated light source 1 in the refractive index situation of the different light of 8 pairs of testing medium, the present embodiment
The narrow spaces light source of laser or Wavelength tunable.
Below in conjunction with Fig. 1 to Fig. 6, the measurement side to measuring the refractive index of testing medium 8 using measurement apparatus in the present embodiment
Method is illustrated.The measuring method in turn includes the following steps：
(1) open collimated light source 1, adjustment measuring arm 42 and detector 420, make light launch hole 10, the first diaphragm 2 it is logical
Unthreaded hole, the light hole of the second diaphragm 3, the slit of the axis of circular stage 41 and detector 420 are in same level axis
On；
(2) drift angle of wedge shape testing medium 8 is determinedAnd by drift angleA drift angle side AB residing for side ABDE it is vertical
It is placed on circular stage 41, and makes the diameter GH of the parallel circular stages 41 of drift angle side AB, adjusts drift angleIt is another
Incident rays of the side ADIC in light launch hole 10 out residing for the DF of drift angle side, reduces circular stage 41, makes
The upper surface ABC of testing medium 8 is less than the horizontal line determined by the first diaphragm 2, the second diaphragm 3；
(3) real-time synchronization of signal processor 6 pick-up probe 420 transmission come intensity of illumination data and stepper motor 5
Direct impulse quantity, and correspondingly storage intensity of illumination data and stepper motor 5 direct impulse quantity；Stepper motor
After 5 are powered, the position for marking current turntable 4 is zero point φ0；For example, when measuring arm 42 turns to certain position with turntable 4
When, then signal processor 6 records the intensity of illumination data that the now transmission of detector 420 comes, and stores stepper motor 5 now simultaneously
The number of pulses received, i.e. signal processor 6 store the intensity of illumination data corresponding to each number of pulses；
(4) stepper motor 5, enabling signal processor 6 and stepper motor 5 are reversely adjusted, is estimated by the setting of signal processor 6
Refracted light deviation angle Δ and initial zero φ0, make circular turntable 4 slowly rotate, and measuring arm is driven by turntable 4
42 synchronous axial systems, wherein, the rotation deviation angle φ of direct impulse quantity m and turntable 4 received by stepper motor 5mBetween
Corresponding relation be：
Wherein, φmWhen the direct impulse number that expression stepper motor 5 is received is m, the deviation angle that the correspondence of turntable 4 is turned over
Degree；When M represents that turntable 4 rotates 360 °, the umber of pulse required for stepper motor 5；For example, when turntable 4 rotates 360 °, stepping
Motor 5 need umber of pulse be 100, then under the conditions of this turntable 4 rotation deviation angle φmWith received by stepper motor 5 just
It is to the corresponding relation between number of pulses mThe forward direction received when stepper motor 5
During pulsed quantity m=2, then the deviation angle φ that now correspondence of turntable 4 is turned over2=7.2 °.
(5) deviation angle φ that turntable 4 is rotated is treatedmThe half for estimating deviation angle Δ is reached, i.e.,When, then it is circular
Objective table 41 rises, and makes turntable 4 rotate its deviation angle φ by signal processor 6mAngle value Δ, i.e. φ are inclined to estimatingm=
During Δ, turntable 4 stops operating；
(6) all intensity of illumination data that signal processor 6 is stored according to step (4) into step (5), obtain illumination strong
Maximum two values E in degrees of data1、E2, and obtain simultaneously respectively to should two maximum intensity of illumination data stepper motor
The 5 direct impulse number m received1、m2；
(7) the direct impulse number for calculating stepper motor 5 is respectively m1、m2When, the deviation angle turned over corresponding to turntable 4
φm1、φm2：Wherein,
(8) according to the drift angle of the testing medium 8 of acquisitionThe deviation angle φ that the correspondence of turntable 4 is turned overm1、φm2, and
Angle corresponding relation, calculates the refractive index n of testing medium1：
Wherein, the angle corresponding relation in this step (8) is with reference to shown in Fig. 5：
The incident ray launched in light launch hole 10 enters in testing medium 8, and its incidence angle is θ；When intensity of illumination number
According to reaching maximum E1When, the deviation angle that now turntable 4 is turned over is φm1；With in measuring arm 42, detector 420 presses former direction
It is rotated further, when intensity of illumination data reach second maximum E2When, the deviation angle that now turntable 4 is turned over is φm2。
Because incident ray is perpendicular to the side ADIC residing for the DF of drift angle side, then incident ray vertical edges DF, soAgain because normal is perpendicular to side DE, so γ+θ=90 °, thenAgain because θ=θ ', thereforeTherefore, root
According to the refractive index of the definition in optics to medium refraction index, then 8 pairs of light of testing medium
(9) signal processor 6 makes stepper motor 5 rotate backward, and drives turntable 4 to reversely rotate, again by signal
The real-time synchronization of processor 6 the intensity of illumination data that transmit of pick-up probe 420 and stepper motor 5 umber of pulse, and deposit one by one
Store up intensity of illumination data and the umber of pulse of corresponding stepper motor；
(10) it is gradually increased to when turntable 4 is rotated to intensity of illuminationWhen, then the rotating speed of stepper motor 5 is reduced, is slowed down
The rotary speed of turntable 4, and recorded by signal processor 6, store now corresponding all intensity of illumination data and stepping electricity
Machine direct impulse number；
Gradually decreased to when turntable 4 is rotated to intensity of illuminationWhen, then increase the rotating speed of stepper motor 5, spin up
The rotary speed of platform 4, is recorded by signal processor 6, stores now corresponding all intensity of illumination data and stepper motor forward direction
Umber of pulse；
(11) it is when turntable 4 is rotated to the direct impulse number of stepper motor 5During corresponding position, then justify
Shape objective table 41 declines, and testing medium 8 is departed from the stop to light；
(12) it is gradually increased to when turntable 4 is rotated to intensity of illuminationWhen, then the rotating speed of stepper motor 5 is reduced, is slowed down
The rotary speed of turntable 4, and recorded by signal processor 6, store now corresponding all intensity of illumination data and stepping electricity
Machine direct impulse number；
Gradually decreased to when turntable 4 is rotated to intensity of illuminationWhen, then increase the rotating speed of stepper motor 5, spin up
The rotary speed of platform 4, makes turntable 4 revolve the dead-center position turned in step (4), i.e., now the deviation angle of turntable 4 is recovered
To φ0, and recorded by signal processor 6, to store corresponding all intensity of illumination data and stepper motor in time period positive
Umber of pulse；
(13) all intensity of illumination data that signal processor 6 is stored according to step (9) into step (12), are obtained successively
Forward and backward maximum two values E in intensity of illumination data3、E4, and obtain simultaneously respectively to should two maximum intensity of illumination numbers
According to stepper motor direct impulse number m3、m4；
(14) the direct impulse number for calculating stepper motor 5 is respectively m3、m4When, the deviation angle that the correspondence of turntable 4 is turned over
φm3、φm4：
(15) according to the drift angle of the testing medium 8 of acquisitionThe deviation angle φ that the correspondence of turntable 4 is turned overm3、φm4, with
And angle corresponding relation, the refractive index n of testing medium 8 is calculated respectively2：
(16) n times are performed successively to operation of the step (4) into step (15), the refractive index number of 2N testing medium is obtained
It is worth (n1,n2,n3,n4,…,n2N), and the average value of 2N testing medium refractive index is calculated respectivelyWith variance δ：
Wherein, niRepresent the refractive index value for i-th of testing medium that calculating is obtained；
(17) average value of the testing medium refractive index obtained according to being calculated in step (16)With variance δ, it is situated between to be measured
The average value of matter refractive indexWith variance δ's and/or difference as testing medium 8 actual refractive index n：Wherein,
It follows that the refractive index n of testing medium 8 existsNumerical intervals in the range of.
In addition, the refractive index in order to determine the different light of 8 pairs of testing medium using the measuring method in the present embodiment, as
Improve, the measuring method of the medium refraction index also includes exchanging different collimated light sources 1, and perform step (2) successively to step
(17) the step of being operated in.Collimated light source 1 is changed into required light source, just testing medium 8 is determined using the measuring method
To the refractive index of different light, the use scope of measurement apparatus in the present embodiment has been expanded.
Claims (4)
1. a kind of measuring method of medium refraction index, it is characterised in that include the measurement apparatus of medium refraction index, the medium
The measurement apparatus of refractive index include with the collimated light source of light launch hole, the first diaphragm, the second diaphragm, circular turntable,
Stepper motor, signal processor and the visible laser source of calibration, the turntable connect stepper motor, stepper motor connection
Signal processor, the center of turntable is provided perpendicular to the jack-post of horizontal plane residing for turntable, and jack-post is treated provided with placement
The circular stage of medium is surveyed, the testing medium is that can survey the wedge prism of drift angle, the top for surveying drift angle with one
Side residing for the arm of angle is perpendicular to the horizontal plane residing for the circular stage, and the drift angle side parallel circular stage
Diameter, the base parallel to the drift angle side and on the wedge prism is overlapped with the diameter of circular stage；It is described
The adjusting knob of regulation circular stage oscilaltion is provided with circular stage, and the circular stage is parallel to rotation
Horizontal plane residing for platform, the center of circle of the turntable and the center of circle of the circular stage are located on same vertical axis, the rotation
It is additionally provided with turntable and the detector for obtaining intensity of illumination and convergence light is provided with length-adjustable measuring arm, measuring arm
GaF2 lens, the detector is connected with signal processor, the light launch hole, the light hole of the first diaphragm, the second diaphragm
Light hole, the slit of testing medium and detector be on same level axis, the GaF2 lens are located at described to be measured
Between the slit of medium and the detector, and the slit of the detector is located at one times of focal length of GaF2 lens；Given an account of
The measuring method of matter refractive index in turn includes the following steps：
(1) collimated light source, adjustment measuring arm and detector are opened, makes light launch hole, the light hole of the first diaphragm, the second diaphragm
Light hole, the slit of circular stage axis and detector is on same level axis；
(2) drift angle of wedge shape testing medium is determinedAnd by drift angleThe residing side in a drift angle side be vertically disposed in circular load
On thing platform, and the diameter of the parallel circular stage in the drift angle side is made, adjust the side residing for another drift angle side of drift angle and hang down
Directly the incident ray in light launch hole out, reduces circular stage, the upper surface of testing medium is less than by the first light
The horizontal line that door screen, the second diaphragm are determined；
(3) signal processor real-time synchronization pick-up probe transmission come intensity of illumination data and stepper motor direct impulse
Quantity, and storage intensity of illumination data and the direct impulse quantity of stepper motor correspondingly；After stepper motor is powered, mark
Current location is zero point φ0；
(4) stepper motor, enabling signal processor and stepper motor are reversely adjusted, the refraction light estimated is set by signal processor
Line deviation angle Δ and initial zero φ0, the circular turntable of order slowly rotates, and drives measuring arm synchronous axial system by turntable,
Wherein, received by the stepper motor direct impulse quantity m and the rotation deviation angle φ of turntablemBetween corresponding relation
For：
Wherein, φmWhen the direct impulse number that expression stepper motor is received is m, the deviation angle that turntable correspondence is turned over；M is represented
When turntable rotates 360 °, the umber of pulse required for stepper motor；
(5) deviation angle φ that turntable is rotated is treatedmThe half for estimating deviation angle Δ is reached, i.e.,When, then circular stage
Rise, and make turntable rotate its deviation angle φ by signal processormAngle value Δ, i.e. φ are inclined to estimatingmDuring=Δ, rotation
Platform stops operating；
(6) all intensity of illumination data that signal processor is stored according to step (4) into step (5), obtain intensity of illumination number
According to middle maximum two values E1、E2, and obtain simultaneously respectively to should the stepper motors of two maximum intensity of illumination data receive
The direct impulse number m arrived1、m2；
(7) the direct impulse number for calculating stepper motor is respectively m1、m2When, the deviation angle φ turned over corresponding to turntablem1、
φm2：Wherein,
(8) according to the drift angle of the testing medium of acquisitionThe deviation angle φ that turntable correspondence is turned overm1、φm2, and angle pair
It should be related to, calculate the refractive index n of testing medium1：
(9) signal processor makes stepper motor rotate backward, and drives turntable to reversely rotate, real-time by signal processor again
Be synchronously received detector transmission intensity of illumination data and stepper motor umber of pulse, and one by one storage intensity of illumination data and
The umber of pulse of corresponding stepper motor；
(10) it is gradually increased to when turntable is rotated to intensity of illuminationWhen, then stepper motor rotating speed is reduced, slows down turntable
Rotary speed, and recorded by signal processor, store now corresponding all intensity of illumination data and stepper motor direct impulse
Number；
Gradually decreased to when turntable is rotated to intensity of illuminationWhen, then increase stepper motor rotating speed, spin up the rotation of platform
Speed, is recorded by signal processor, stores now corresponding all intensity of illumination data and stepper motor direct impulse number；
(11) it is when turntable is rotated to stepper motor direct impulse numberDuring corresponding position, then circular loading
Platform declines, and testing medium is departed from the stop to light；
(12) it is gradually increased to when turntable is rotated to intensity of illuminationWhen, then stepper motor rotating speed is reduced, slows down turntable
Rotary speed, and recorded by signal processor, store now corresponding all intensity of illumination data and stepper motor direct impulse
Number；
Gradually decreased to when turntable is rotated to intensity of illuminationWhen, then increase stepper motor rotating speed, spin up the rotation of platform
Speed, makes turntable revolve the dead-center position turned in step (4), and is recorded by signal processor, stores right in time period
All intensity of illumination data and stepper motor direct impulse number answered；
(13) all intensity of illumination data that signal processor is stored according to step (9) into step (12), obtain illumination successively
Forward and backward maximum two values E in intensity data3、E4, and obtain simultaneously respectively to should two maximum intensity of illumination data
Stepper motor direct impulse number m3、m4；
(14) the direct impulse number for calculating stepper motor is respectively m3、m4When, the deviation angle φ that turntable correspondence is turned overm3、
φm4：
(15) according to the drift angle of the testing medium of acquisitionThe deviation angle φ that turntable correspondence is turned overm3、φm4, and angle pair
It should be related to, the refractive index n of testing medium is calculated respectively2：
(16) n times are performed successively to operation of the step (4) into step (15), the refractive index value of 2N testing medium is obtained
(n1,n2,n3,n4,…,n2N), and the average value of 2N testing medium refractive index is calculated respectivelyWith variance δ：
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</mrow>
<mrow>
<mi>&delta;</mi>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mrow>
<mn>2</mn>
<mi>N</mi>
</mrow>
</mfrac>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>2</mn>
<mi>N</mi>
</mrow>
</munderover>
<msup>
<mrow>
<mo>(</mo>
<msub>
<mi>n</mi>
<mi>i</mi>
</msub>
<mo>-</mo>
<mover>
<mi>n</mi>
<mo>&OverBar;</mo>
</mover>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>;</mo>
</mrow>
Wherein, niRepresent the refractive index value for i-th of testing medium that calculating is obtained；
(17) average value of the testing medium refractive index obtained according to being calculated in step (16)With variance δ, testing medium is reflected
The average value of rateWith variance δ's and/or difference as testing medium actual refractive index n：Wherein,
<mrow>
<mi>n</mi>
<mo>=</mo>
<mover>
<mi>n</mi>
<mo>&OverBar;</mo>
</mover>
<mo>+</mo>
<mi>&delta;</mi>
<mo>.</mo>
</mrow>
2. the measuring method of medium refraction index according to claim 1, it is characterised in that also including exchanging different collimations
Light source, and the step of being operated in step (2) to step (17) is performed successively.
3. the measuring method of medium refraction index according to claim 1, it is characterised in that the detector detects for temperature-sensitive
Device or infrared light-sensitive detector or photoelectron molded line formation detector or silicon photocell detector.
4. the measuring method of medium refraction index according to claim 1, it is characterised in that the collimated light source be laser or
The narrow spaces light source of person's Wavelength tunable.
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