CN206740251U - Beat frequency method light velocity analyzer - Google Patents
Beat frequency method light velocity analyzer Download PDFInfo
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- CN206740251U CN206740251U CN201720338483.5U CN201720338483U CN206740251U CN 206740251 U CN206740251 U CN 206740251U CN 201720338483 U CN201720338483 U CN 201720338483U CN 206740251 U CN206740251 U CN 206740251U
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- chopper
- beat frequency
- light
- thin plate
- frequency method
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Abstract
The utility model discloses a kind of beat frequency method light velocity analyzer, including laser, frequency shifter, diaphragm, chopper and the photoreceiver set gradually, Y shape optical fiber is set between the diaphragm and chopper, the Y shape optical fiber diverges to the short difference of two section chiefs of part, the chopper is a thin plate, one translucent second half of thin plate is reflective mirror, and thin plate around its center the rotation with surface where thin plate, the chopper slant setting.The utility model beat frequency method light velocity analyzer, its measurement accuracy is high, easy to adjust, small volume.
Description
Technical field
A kind of optical instrument is the utility model is related to, more particularly to a kind of light velocity analyzer.
Background technology
Beat frequency method light velocity analyzer is laser beam is produced fixing frequency displacement using frequency shifting arrangement, the optical superposition shape for having difference on the frequency
Into the longer wavelengths of beat frequency light of specific frequency, beat frequency light is divided into short range light and long-range light, incided respectively on light-sensitive element,
Two optical signals of oscilloscope display are used again, change long-range light path, make optical signal that phase shift occur, then using formula, by long-range
Beat frequency light frequency when being 2 π or 0 of light and short range light position difference and the now measurement of the optical path difference of long-range light and short range light are realized
The measurement of the light velocity.Frequency is measured with common frequency meter, and the light path that long-range light and short range light are measured with meter ruler obtains optical path difference.It is existing
Some measuring instruments have the types of HLD-LS- III, the types of CG- IV, the types of GSY- IV etc., and its principle using chopper 1 ' as shown in figure 1, will be clapped
Frequency light is divided into two beams, a branch of to be irradiated to by primary event on light-sensitive element 2 ', and another beam is continuously reciprocal using 10 level crossings
Reflection, it is irradiated to after increasing light path on light-sensitive element 2 '.There are following shortcomings in above-mentioned measuring instrument, one, it is necessary to adjust 10 instead
Mirror is penetrated, technical requirements are high and time-consuming；Two, long-range light after multiple reflections is because scattering dies down so that signal peak diminishes, two letters
Number it is difficult to overlap and influences measurement accuracy；Third, each plane mirror spacing need to be increased so that instrument takes to ensure that optical path difference is sufficiently large
Larger space, and cause the increase of light path measurement error.
Utility model content
The purpose of this utility model is to provide a kind of beat frequency method light velocity analyzer, to solve to ask existing for above-mentioned prior art
Topic, its measurement accuracy is high, easy to adjust, small volume.
To achieve the above object, the utility model provides following scheme：A kind of beat frequency method light velocity analyzer, including successively
Laser, frequency shifter, diaphragm, chopper and the photoreceiver of setting, Y shape light guide is set between the diaphragm and chopper
Fiber, the Y shape optical fiber diverge to the short difference of two section chiefs of part, and the chopper is a thin plate, and the one of chopper is semi-transparent
Bright second half is reflective mirror, and chopper around its center the rotation with surface where chopper, the chopper front towards
Short distance light, the back side is towards long-range light, the chopper slant setting.
The utility model beat frequency method light velocity analyzer, wherein, the thin plate is made up of glass.
The utility model beat frequency method light velocity analyzer, wherein, the thin plate is discoid.
The utility model beat frequency method light velocity analyzer, wherein, the chopper is driven by motor, and the center of the thin plate is opened
There is through hole, the output shaft of the motor is arranged in the through hole to be fixedly connected with the thin plate.
The utility model beat frequency method light velocity analyzer, wherein, the Y shape optical fiber diverges to longer one of part
End can move forward and backward.
The utility model beat frequency method light velocity analyzer, wherein, the angle of plane and horizontal plane where the chopper is
30°。
The utility model achieves following technique effect relative to prior art：Because the utility model beat frequency method light velocity is surveyed
Determine instrument and Y shape optical fiber is set between diaphragm and chopper, Y shape optical fiber diverges to the short difference of two section chiefs of part, beat frequency
Light light is divided into short range light and long-range light in Y type optical fibers, chopper one it is translucent second half be reflective mirror, and cutting
Rotation with surface where the thin plate of light device, can be such that short range light, long-range light is spaced successively into photoreceiver, without again through multiple
Speculum reflection can ensure there are enough optical path differences, therefore error is small, measurement accuracy is high, analyzer easy to adjust, whole
Small volume, occupy little space.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
In the required accompanying drawing used be briefly described, it should be apparent that, drawings in the following description are only of the present utility model
Some embodiments, for those of ordinary skill in the art, without having to pay creative labor, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is the schematic diagram of beat frequency method light velocity analyzer in the prior art；
Fig. 2 is the schematic diagram of the utility model beat frequency method light velocity analyzer；
Fig. 3 is the front elevation of chopper in the utility model beat frequency method light velocity analyzer；
Fig. 4 is the back view of chopper in the utility model beat frequency method light velocity analyzer.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
To enable above-mentioned purpose of the present utility model, feature and advantage more obvious understandable, below in conjunction with the accompanying drawings and tool
Body embodiment is described in further detail to the utility model.
As shown in Fig. 2 a kind of beat frequency method light velocity analyzer of the utility model includes laser 11, the frequency shifter set gradually
12nd, diaphragm 13, Y shape optical fiber 16, chopper 14 and photoreceiver 15, Y shape optical fiber 16 diverge to two section chiefs of part
Short difference, the single line end of Y types optical fiber 16 receive the beat frequency light projected from diaphragm 13, and beat frequency light light is in Y type optical fibers
It is divided into two beams in 16, what it is from shorter one port outgoing is short range light, and what it is from longer one port outgoing is long-range light,
As shown in Figure 2,3, 4, chopper 14 is a thin plate, and translucent second half of chopper is reflective mirror, and chopper can be by
Motor 141 drives around its center rotation with surface, the slant setting of chopper 14, the place plane of chopper 14 where chopper
Angle with horizontal plane is 30 °, and the front of chopper 14 is towards short distance light, and the back side is towards long-range light.
Thin plate is made of glass or other transparent materials, through hole is provided with the center of thin plate, the output shaft of motor 141 is set
It is placed in through hole and is fixedly connected with thin plate.
One the longer end that Y shape optical fiber 16 diverges to part is fixed on a flat board, and flat board can move forward and backward
So as to which one the end for driving Y shape optical fiber 16 longer moves forward and backward.
The utility model beat frequency method light velocity analyzer is as follows using step：
1) voltage-stabilized power supply switch is connected, using+15V dc source, carefulness regulation ultrasonic frequency, regulation laser beam leads to
Cross acousto-optic medium and with fully interacting and (being completed by adjusting the screw on frequency shifter base) in sound field, adjust high-frequency signal
Source frequency vernier knob, it is allowed to produce more than two level most strong diffraction pattern；
2) diaphragm is adjusted, required zero level or one-level light beam are chosen with diaphragm；
3) above-mentioned selected light beam is divided into short range light and long-range light after Y types optical fiber 16, is rotated in chopper
When Cheng Zhong, short range light and long-range light are irradiated to half fully transparent on chopper from front and back respectively, two-beam is complete
Through not interfereing with each other, long-range light can be directly entered photoreceiver, and short range light and long-range light are irradiated to from front and back respectively
Second half when, long-range light is reflected away, and short range light is by being reflected into photoreceiver, and short range light and long-range light can are successively
Interval enters photoreceiver, regulation photoreceiver orientation, makes to show short range light and far respectively on oscilloscope screen
Cheng Guang clear sine wave, sine wave have phase change.Due to visual persistence effect, we can see remote simultaneously on oscillograph
Cheng Guang and short range light signal, the relative position of regulation outgoing beam and photo-detector photosurface so that caused by two-beam just
String wave-shape amplitude is equal.When two-beam path difference is the wavelength of beating wave, two waveforms are completely superposed；
4) flat board is moved forward and backward, adjusts the optical path difference of long-range light and short range light, makes two sinusoidal waveforms on oscillograph completely heavy
(position difference is) is closed, now the optical path difference of two-way is beat wavelength；
5) optical path difference of two light beams is measured with meter ruler, beat frequency, wherein F are ultrasonic frequency, are read by digital frequency meter, essence
The really frequency F of measure power signal source, is repeated a number of times, and records measurement data, according to formula：He-Ne laser is calculated to exist
Spread speed c in air, and standard deviation is calculated, and experiment value is compared with generally acknowledged value and carries out error analysis.
Apply specific case in the utility model to be set forth principle of the present utility model and embodiment, the above
The explanation of embodiment is only intended to help and understands method and its core concept of the present utility model；Meanwhile for the one of this area
As technical staff, according to thought of the present utility model, there will be changes in specific embodiments and applications.To sum up
Described, this specification content should not be construed as to limitation of the present utility model.
Claims (6)
1. a kind of beat frequency method light velocity analyzer, including laser (11), frequency shifter (12), diaphragm (13), the chopping the light set gradually
Device (14) and photoreceiver (15), it is characterised in that：Set Y shape light guide fine between the diaphragm (13) and chopper (14)
Tie up (16), the Y shape optical fiber (16) diverges to the short difference of two section chiefs of part, and the chopper (14) is a thin plate, described
One translucent second half of chopper (14) is reflective mirror, and the chopper (14) around its center in the chopper (14)
Place rotation with surface, chopper (14) front tilt towards short distance light, the back side towards long-range light, the chopper (14)
Place.
2. beat frequency method light velocity analyzer according to claim 1, it is characterised in that：The thin plate is made up of glass.
3. beat frequency method light velocity analyzer according to claim 2, it is characterised in that：The thin plate is discoid.
4. beat frequency method light velocity analyzer according to claim 3, it is characterised in that：The chopper (14) is by motor
(141) drive, the center of the thin plate is provided with through hole, the output shaft of the motor (141) be arranged in the through hole with it is described
Thin plate is fixedly connected.
5. beat frequency method light velocity analyzer according to claim 4, it is characterised in that：The Y shape optical fiber (16) is diverged to
Partial one longer end can move forward and backward.
6. beat frequency method light velocity analyzer according to claim 5, it is characterised in that：Plane where the chopper (14) with
The angle of horizontal plane is 30 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720338483.5U CN206740251U (en) | 2017-04-01 | 2017-04-01 | Beat frequency method light velocity analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720338483.5U CN206740251U (en) | 2017-04-01 | 2017-04-01 | Beat frequency method light velocity analyzer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206740251U true CN206740251U (en) | 2017-12-12 |
Family
ID=60558369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720338483.5U Expired - Fee Related CN206740251U (en) | 2017-04-01 | 2017-04-01 | Beat frequency method light velocity analyzer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206740251U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110531103A (en) * | 2019-09-30 | 2019-12-03 | 浙江海洋大学 | A kind of light velocity measurement method and apparatus based on Lissajou's figure |
| CN111256846A (en) * | 2020-01-16 | 2020-06-09 | 山东超越数控电子股份有限公司 | Method and equipment for measuring light velocity by using phase-locked amplifier |
| CN113267469A (en) * | 2021-05-08 | 2021-08-17 | 泰山学院 | Method and system for measuring refractive index of transparent liquid |
-
2017
- 2017-04-01 CN CN201720338483.5U patent/CN206740251U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110531103A (en) * | 2019-09-30 | 2019-12-03 | 浙江海洋大学 | A kind of light velocity measurement method and apparatus based on Lissajou's figure |
| CN111256846A (en) * | 2020-01-16 | 2020-06-09 | 山东超越数控电子股份有限公司 | Method and equipment for measuring light velocity by using phase-locked amplifier |
| CN111256846B (en) * | 2020-01-16 | 2022-09-16 | 超越科技股份有限公司 | Method and equipment for measuring light velocity by using phase-locked amplifier |
| CN113267469A (en) * | 2021-05-08 | 2021-08-17 | 泰山学院 | Method and system for measuring refractive index of transparent liquid |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171212 |