CN208780350U - A kind of light velocity measurement device - Google Patents
A kind of light velocity measurement device Download PDFInfo
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- CN208780350U CN208780350U CN201821488769.2U CN201821488769U CN208780350U CN 208780350 U CN208780350 U CN 208780350U CN 201821488769 U CN201821488769 U CN 201821488769U CN 208780350 U CN208780350 U CN 208780350U
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Abstract
The utility model discloses a kind of light velocity measurement device, belong to light velocity measurement field, including the transmitting module and receiving module being set on cabinet, the reflector alignment that the utility model is configured is high-efficient and accurate, photo-beat is transmitted in the horizontal direction during guaranteeing light velocity measurement, false phase shift is avoided to generate, light velocity measurement precision is higher.
Description
Technical field
The utility model belongs to light velocity measurement field, and in particular to a kind of light velocity measurement device.
Background technique
The light velocity it is accurate measurement have important role to the development of physics, in vacuum the theoretical value of velocity of electromagnetic wave with
The light velocity measured in experiment is close, and Maxwell is promoted to foretell that light is a kind of electromagnetic wave；Pass through survey in Michelson-Morley experiment
The light velocity is measured, the conclusion of different inertial systems and different directions smoothed-spline surface has been obtained, the presence of ether is negated, to be Ai Yinsi
Smooth special relativity is laid a good foundation.It therefore, is all scientist's important class of special interest all the time to the measurement of the light velocity
Topic, the measurement of the light velocity has been begun to from the mankind at the beginning of the 17th century, scientific and technical sustainable development also improves the measurement accuracy of the light velocity.
There are the gear method and rotating mirror method using long range in astronomy, there is the standing wave method using microwave in electromagnetism and utilizes light wave
The method of the Michelson's interferometer of interference.American scientist angstrom Vincent in 1973 measures the light velocity with laser technology and is
2.997924874×108M/s, precision 1.2m/s.Photo-beat method is generally used to measure the light velocity when Scientific Research in University Laboratory is imparted knowledge to students,
Its cost is not high, and intuitively and can be readily achieved measurement on laboratory table.Measurement accuracy is main when photo-beat method measures the light velocity
It is related with the phase difference of long-range light and process light on oscillograph.If operation is incorrect, false phase shift will be generated, influence light
The measurement accuracy of speed.Carefully adjustment optical path, makes L1 (short range light) and L2 (long-range light) be incident on photosurface along L optical axis, is anti-
The only feasible method that false phase shift generates.Short range light adjusts optical path and is relatively easy to when experiment, but long-range light is because apart from photoelectricity two
Pole pipe farther out, therefore adjusts long-range light and is incident on photosurface more difficulty, and the experiment of student is made to be difficult to complete.
Utility model content
It is high-efficient and accurate the purpose of this utility model is to provide a kind of reflector alignment, during guarantee light velocity measurement
Photo-beat is transmitted in the horizontal direction, is avoided false phase shift from generating, is quickly measured a kind of light velocity measurement device of light velocity value.
The technical solution that the utility model is taken to achieve the above object are as follows: a kind of light velocity measurement device, including setting
In transmitting module and receiving module on cabinet, transmitting module includes: the He-Ne laser for being set to tank surface, is swashed with He-Ne
The acousto-optic frequency shifters of the corresponding installation of light device, the light bar of installation corresponding with acousto-optic frequency shifters, the total reflection mirror of installation corresponding with light bar
The half-reflecting mirror I and chopper of I, installation corresponding with total reflection mirror I and mutual cooperation setting, with half-reflecting mirror I and chopper pair
Total reflection mirror II, the half-reflecting mirror II that should be installed, the total reflection mirror III of installation corresponding with total reflection mirror II, with total reflection mirror III
The prism II that is all-trans, the prism I that is all-trans of installation corresponding with the prism II that is all-trans of corresponding installation, it is corresponding with the prism I that is all-trans install it is complete
Anti- prism III, the half-reflecting mirror II of installation corresponding with the prism III that is all-trans.The utility model is by above-mentioned component on cabinet
It solves the problems, such as that false phase shift generates in conjunction with setting, specifically makes far and near Cheng Guangzhong's in conjunction with setting by above-mentioned component
Long-range light can quickly make far and near Cheng Guangjun by the relative positional relationship adjustment of the prism II that is all-trans, be all-trans prism III and remaining part
It is mapped on photosurface along L optical axis, keeps the electron transit time of each point on photoelectric tube photosurface consistent, false phase shift is avoided to generate,
The optical path difference of distance Cheng Guang quickly and is precisely obtained, long-range light is adjusted in reduction light velocity measurement experimentation and is incident on photosurface
Difficulty avoids the failure of an experiment or light velocity measurement value not accurate.
Preferably, receiving module includes the opto-electronic receiver box being set on cabinet, is equipped in opto-electronic receiver box and half reflection
Mirror II corresponds to the frequency divider of installation, further respectively has knob I, knob II, window on opto-electronic receiver box.By adjusting knob I and
Knob II can realize that far and near Cheng Guang reaches the same space position of photosurface, avoid generating false phase shift.According to opto-electronic receiver box
Interior photodiode converts far and near Cheng Guang to the high frequency electrical signal of photo-beat frequency, and signal is input to frequency divider box after being amplified
In.This signal and the signal of local oscillation are mixed, and are exported after carrying out frequency-selecting and amplification to longitudinal input terminal of oscillograph.
Simultaneously, the another way signal in high-frequency ultrasonic signal source is also input in frequency divider box, and oscillograph is used as after frequency-selecting and amplification
Outer triggering signal source.In addition, the frequency of photo-beat signal is twice of incident ultrasound wave frequency rate, ultrasonic wave sinusoidal signal is connect
Enter the frequency to photo-beat signal i.e. measurable on frequency meter.
Preferably, opto-electronic receiver box is connected with oscillograph, for showing the waveform and parameter of far and near Cheng Guang.It is connect by photoelectricity
It receives box and oscillograph obtains the phase difference of short range light and long-range light, and after the optical path difference of the corresponding far and near photo-beat of measurement, obtain photo-beat
Wavelength simultaneously calculates the light velocity.
Preferably, total reflection mirror I, total reflection mirror II, total reflection mirror III, half-reflecting mirror I, be equipped on half-reflecting mirror II
Level keeps each reflecting mirror to be in horizontality, so that photo-beat be allow to transmit all along horizontal direction, improves the light velocity
Measure accuracy.
Preferably, the prism II1 and prism III that is all-trans that is all-trans is respectively arranged on sliding block, and sliding block is respectively arranged on guide rail,
Guide rail is installed on cabinet.Can quickly it be made by the relative positional relationship adjustment of the prism II that is all-trans, be all-trans prism III and remaining part
Far and near Cheng Guang is mapped on photosurface along L optical axis, realizes that the electron transit time of each point on photoelectric tube photosurface is consistent.
Preferably, it is respectively equipped with graduation mark on guide rail, through-hole is offered on sliding block, is equipped with bar magnet in through-hole.It draws
It can be easy to read the position readings of mobile front and back sliding block after scale making, so that the optical path difference of long-range light and short range light is obtained,
Light velocity value is obtained faster, through-hole is being opened up on sliding block and is cooperating placement bar magnet that can will be slided when sliding block is read by bar magnet in it
Block position is fixed, and avoiding sliding block from generating sliding keeps reading not accurate, while the position of the fixed sliding block of bar magnet can guarantee light velocity measurement
Sliding block guarantees measured value accuracy without sliding phenomenon in the process.
Preferably, total reflection mirror I, total reflection mirror II, total reflection mirror III side respectively correspond equipped with locator.In light
Surveying in experiment take a long time is exactly the angle for adjusting reflecting mirror between the prism that is all-trans, it is desirable that and make it with optical axis at 45 degree of angles,
Position of the total reflection mirror on cabinet is limited by the locator that is equipped with, fast implements total reflection mirror and optical axis into 45 degree of angles,
To guarantee long-range light along horizontal direction transmission and be incident on photosurface along L optical axis.
Preferably, locator is formed by stacking by least two blocks of L-type magnetic sheets, and first positioning hole and second are respectively equipped on magnetic sheet
Location hole, tank surface are carved with the angle line with locators.Locator is cooperated relative to angle line and is placed, then will be all-trans
It penetrates mirror and locators is placed, locator realizes total reflection mirror and optical axis at 45 position limitation of the total reflection mirror on cabinet
Angle is spent, there is magnetism can form suction to the supporting block that total reflection mirror is installed, the total reflection mirror in flash ranging experiment be avoided to go out for magnetic sheet
Now displacement causes the accuracy of light velocity measurement value to reduce, while the one or two location hole opens up the matching hole that can cooperate in supporting block
So that supporting block is placed on above locator the position height for adjusting total reflection mirror, can also by decrease or increase magnetic sheet quantity into
The position height of one step section total reflection mirror.
Preferably, total reflection mirror I, total reflection mirror II, total reflection mirror III are separately mounted in L-type supporting block, supporting block with
Cabinet contact jaw is equipped with matching hole.Supporting block height and position is consistent, and photo-beat is transmitted in the horizontal direction during guaranteeing light velocity measurement,
It also can be placed in by matching hole above locator and adjust the position height of total reflection mirror.
Preferably, body side is equipped with operation button, is convenient for flash ranging operation.
Compared with prior art, the utility model has the following beneficial effects: the utility model is made far by component in conjunction with setting
Long-range light in short range light can be adjusted by the relative positional relationship of the prism that is all-trans, total reflection mirror and remaining part quickly makes far and near journey
Light is mapped on photosurface along L optical axis, keeps the electron transit time of each point on photoelectric tube photosurface consistent, and false phase shift is avoided to produce
It is raw, quickly and precisely obtain the optical path difference of distance Cheng Guang, adjusted in reduction light velocity measurement experimentation long-range light be incident on it is photosensitive
The difficulty in face avoids the failure of an experiment or light velocity measurement value not accurate.
Detailed description of the invention
Fig. 1 is a kind of light velocity measurement schematic device of the utility model；
Fig. 2 is the guide rail side schematic view of the utility model；
Fig. 3 is that total reflection mirror and locator position cooperate schematic diagram；
Fig. 4 is a kind of index path of light velocity measurement device of the utility model；
Fig. 5 is a kind of working principle diagram of light velocity measurement device of the utility model；
Fig. 6 is short range light, the false phase shift of generation is caused the schematic diagram of error by long-range light.
Description of symbols: 1 He-Ne laser；2 acousto-optic frequency shifters；3 operation buttons；4 light bars；5 total reflection mirror I, 6 are entirely
Reflecting mirror II, 7 total reflection mirror III；8 half-reflecting mirror I, 9 half-reflecting mirror II；10 are all-trans prism I；11 be all-trans prism II, 12 be all-trans
Prism III；13 choppers；14,15 guide rail；16 cabinets；17 opto-electronic receiver boxes；18 frequency dividers；19 windows；20 knob I；21 rotations
Button II；22 photodiodes；23 photosurfaces；24 cabinets；24a angle line, 25 levels；26 locators；27 sliding blocks；27a is logical
Hole；28 magnetic sheets；28a second location hole；28b first positioning hole；29 supporting blocks；29a matching hole.
Specific embodiment
The utility model is described in further detail with attached drawing with reference to embodiments:
Embodiment 1:
As shown in Figs. 1-5, a kind of light velocity measurement device, including the transmitting module and receiving module being set on cabinet 24,
Transmitting module includes: the He-Ne laser 1 for being set to 24 surface of cabinet, the acousto-optic frequency shifters of installation corresponding with He-Ne laser 1
2, the light bar 4 of installation corresponding with acousto-optic frequency shifters 2, the total reflection mirror I5 of installation corresponding with light bar 4, peace corresponding with total reflection mirror I5
Dress and the half-reflecting mirror I8 and chopper 13 of the setting that cooperates, the total reflection of installation corresponding with half-reflecting mirror I8 and chopper 13
Mirror II6, half-reflecting mirror II9, the total reflection mirror III7 of installation corresponding with total reflection mirror II6, installation corresponding with total reflection mirror III7
The prism II11 that is all-trans, the prism I10 that is all-trans of installation corresponding with the prism II11 that is all-trans, it is corresponding with the prism I10 that is all-trans installation it is complete
Anti- prism III12, the half-reflecting mirror II9 of installation corresponding with the prism III12 that is all-trans.Short range light as shown in Figure 6 enters along lens L optical axis
It penetrates, converges at P1 point, long-range light off-axis incident converges at P2 point and the false phase shift of generation is caused error.The utility model passes through upper
It states combination setting of the component on cabinet 24 and solves the problems, such as that false phase shift generates, specifically combined by above-mentioned component
Be arranged make far and near Cheng Guangzhong long-range light can by the prism II11 that is all-trans, be all-trans prism | | | 12 close with the relative position of remaining part
System's adjustment is mapped to far and near Cheng Guang on photosurface along L optical axis, makes the electron transit time of each point on photoelectric tube photosurface
Unanimously, it avoids false phase shift from generating, quickly and precisely obtains the optical path difference of distance Cheng Guang, reduce and adjusted in light velocity measurement experimentation
The difficulty that long-range light is incident on photosurface is saved, avoids the failure of an experiment or light velocity measurement value not accurate.
Receiving module includes the opto-electronic receiver box 17 being set on cabinet 24, is equipped in opto-electronic receiver box 17 and half-reflecting mirror
II9 corresponds to the frequency divider 18 of installation, further respectively has knob I20, knob II21, window 19 on opto-electronic receiver box 17.Pass through tune
Section knob I20 and knob II21 can realize that far and near Cheng Guang reaches the same space position of photosurface, avoid generating false phase shift.Root
Far and near Cheng Guang is converted to according to the photodiode in opto-electronic receiver box the high frequency electrical signal of photo-beat frequency, signal inputs after being amplified
Into frequency divider box.This signal and the signal of local oscillation are mixed, and are exported after carrying out frequency-selecting and amplification to oscillograph
Longitudinal input terminal.Simultaneously, the another way signal in high-frequency ultrasonic signal source is also input in frequency divider box, after frequency-selecting and amplification
Outer triggering signal source as oscillograph.In addition, the frequency of photo-beat signal is twice of incident ultrasound wave frequency rate, by ultrasonic wave
Sinusoidal signal is linked into the frequency that can measure photo-beat signal on frequency meter.
Opto-electronic receiver box 17 is connected with oscillograph, for showing the waveform and parameter of far and near Cheng Guang.Pass through opto-electronic receiver box
The phase difference of short range light and long-range light is obtained with oscillograph, and after the optical path difference of the corresponding far and near photo-beat of measurement, obtains photo-beat wavelength
And calculate the light velocity.
Total reflection mirror I5, total reflection mirror II6, total reflection mirror III7, half-reflecting mirror I8, it is equipped with water on half-reflecting mirror II9
Quasi- instrument 25 keeps each reflecting mirror to be in horizontality, so that photo-beat be allow to transmit all along horizontal direction, improves the light velocity
Measure accuracy.
The prism II11 and prism III12 that is all-trans that is all-trans is respectively arranged on sliding block 27, and sliding block is respectively arranged in guide rail 14,15
On, guide rail 14,15 is installed on cabinet 24.It can be by the opposite position of the prism II11 that is all-trans, be all-trans prism III12 and remaining part
Setting relationship adjustment is mapped to far and near Cheng Guang on photosurface along L optical axis, realizes that the electronics of each point on photoelectric tube photosurface crosses
More time consistency.
It is respectively equipped with graduation mark on guide rail 14,15, through-hole 27a is offered on sliding block 27, is equipped with magnetic in through-hole 27a
Stick.The position readings of mobile front and back sliding block 27 can be easy to read after drawing scale, to obtain long-range light and short range light
Optical path difference obtains light velocity value faster, and through-hole 27a is opened up on sliding block 27 and cooperation placement bar magnet can be in sliding block 27 in it
Slide position is fixed by bar magnet when reading, avoiding sliding block 27 from generating sliding keeps reading not accurate, while the fixed sliding block 27 of bar magnet
Position can guarantee light velocity measurement during sliding block 27 without sliding phenomenon, guarantee measured value accuracy.
Total reflection mirror I5, total reflection mirror II6, total reflection mirror III7 side respectively correspond equipped with locator 26.In the light velocity
What is taken a long time in measurement experiment is exactly the angle for adjusting reflecting mirror between the prism that is all-trans, it is desirable that makes it with optical axis at 45 degree
Angle limits position of the total reflection mirror on cabinet 24 by the locator 26 that is equipped with, fast implement total reflection mirror and optical axis at
45 degree of angles, to guarantee that long-range light transmits along horizontal direction and is incident on photosurface along L optical axis direction.
Locator 26 is formed by stacking by least two blocks of L-type magnetic sheets 28, and first positioning hole 28a and are respectively equipped on magnetic sheet 28
The angle line 24a cooperated with locator 26 is carved on two location hole 28b, 24 surface of cabinet.By locator 26 relative to angle line 24a
Cooperation is placed, then total reflection mirror and the cooperation of locator 26 are placed, and locator 26 limits position of the total reflection mirror on cabinet 24
System realizes total reflection mirror and optical axis into 45 degree of angles, and there is magnetic sheet 28 magnetic can be formed to the supporting block 29 that total reflection mirror is installed to inhale
Power avoids the total reflection mirror appearance displacement in flash ranging experiment that the accuracy of light velocity measurement value is caused to reduce, while the one or two positioning
The opening up of hole can cooperate the matching hole 29a in supporting block 29 to be placed on supporting block 29 above locator 26 to adjust total reflection mirror
Position height, the position height of total reflection mirror can be also further adjusted by decreasing or increasing 28 quantity of magnetic sheet.
Total reflection mirror I5, total reflection mirror II6, total reflection mirror III7 are separately mounted in L-type supporting block 29, supporting block 29 with
24 contact jaw of cabinet is equipped with matching hole 29a.29 height and position of supporting block is consistent, and photo-beat is along level side during guaranteeing light velocity measurement
To transmission, the position height that adjusts total reflection mirror is also can be placed in above locator 26 by matching hole 29a.
24 side of cabinet is equipped with operation button 3, is convenient for flash ranging operation.
Embodiment 2:
The acousto-optic frequency shifters 2 of the utility model are internal under the action of ultrasonic wave to generate strain, can cause interior media
The cyclically-varying of refractive index.In order to enhance the reflection of ultrasonic wave, can be applied on the surface of emission of the acousto-optic medium with sound source face
The upper stronger material of emissivity.Along the direction that ultrasonic wave is propagated, when the thickness of medium is exactly the integral multiple of ultrasonic wave half-wavelength
When, it advance ultrasonic wave and reflects ultrasonic wave and can form standing-wave ultrasonic field in the medium, acousto-optic medium at this time may be considered
One ultrasonic phase grating.He-Ne laser 1, which emits to be equivalent to when laser beam is incident in acousto-optic frequency shifters 2, is incident on grating
On, to generate several grades of diffraction fringes.In addition to the laser frequency of the different orders of diffraction changes, in same level-one diffraction light
Have the laser light wave of different frequency.Therefore, there is the difference of the frequency of very little, symbol with different frequency laser in the diffraction light of level-one
Close the condition for generating photo-beat.For example, the 1st grade of (or zero level) diffraction light is chosen, by its 0th grade and the 1st grade of two kinds of frequency contents
Diffraction optical superposition, can be obtained beat frequency be 2F photo-beat, wherein F is the frequency of ultrasonic wave.
Embodiment 3:
The device Photometry principle of the utility model are as follows:
Emitting portion: the optical maser wavelength of He-Ne laser transmitting is 632nm, and power is greater than 1mW, is incident on acousto-optic frequency shifters
In.For the output frequency of the ultrasonic wave of sinusoidal variations in 50MHz or so, power is also incident on acousto-optic frequency shifters in 1w or so simultaneously
In.Ultrasonic wave makes to generate standing wave in the medium of acousto-optic frequency shifters, forms a phase grating.After laser light incident acousto-optic frequency shifters,
With diffraction lights more than 2 kinds of frequencies in the emergent light of frequency shifter, " photo-beat " signal can produce.The frequency of photo-beat signal be into
Twice for penetrating ultrasonic frequency, and preselected and exported after power amplification.
Opto-electronic receiver and signal processing: beat frequency light into after crossing light path system, distinguished by reflecting mirror and convex lens by photo-beat
Photodiode is reflected and focused on, converts photo-beat signal to the electric signal of high frequency, signal is input to frequency divider after being amplified
In box.This signal and the signal of local oscillation are mixed, and are exported after carrying out frequency-selecting and amplification to the input of the longitudinal direction of oscillograph
End.Simultaneously, the another way signal in high-frequency ultrasonic signal source is also input in frequency divider box, and oscillography is used as after frequency-selecting and amplification
The outer triggering signal source of device.It is specifically intended that the internal trigger mode of oscillograph cannot be used, this triggering mode cannot be just
Really show phase difference between far and near light path.
Embodiment 4:
The device of the utility model needs to be debugged before surveying light, and specific step is as follows for debugging:
(1) switch of general supply is connected.
(2) laser is allow to launch laser beam.
(3) according to the detailed operation instructions of oscillograph, each knob of oscillograph and switch are selected into suitable position,
The attenuation coefficient of Y-axis and the speed of scanning are suitably selected according to the intensity and signal frequency of input signal.Oscillograph must
It must be set as the working condition of external trigger, otherwise the phase difference of far and near light path cannot correctly compare in oscillograph.
(4) switch for connecting regulated power supply, lights two indicator lights, then it represents that the power supply power supply of ± 15V is normal.
(5) laser beam must be allow to pass through the light hole center of acousto-optic frequency shifters without a hitch, reach and be situated between with acousto-optic
The target (can complete this operation by adjusting six screws of acousto-optic frequency shifters pedestal) of matter sound field interaction, exists at this time
It should be seen that the speck of a row of horizontal diffraction light in light bar.
(6) it allows the height at 4 center of light bar and the center of total reflection mirror I5 contour, leads to laser beam smoothly without barrier
It crosses light bar 4 and is incident on total reflection mirror I 5, regulated power supply switch should be closed when operating this step, avoid generating the several of laser
A diffraction pattern.
(7) chopper 13 is used；Long-range light is first blocked, total reflection mirror I 5 is adjusted；With half-reflecting mirror II 9；Pass through short range light
Normal incidence is crossed after frequency divider 18 to photelectric receiver 17；On the photosurface 23 of photodiode 22, push aside on photelectric receiver box
Window 19；Whether the punctation of observable laser beam can accurately be incident on the middle of photosurface, at this time oscillograph
Clearly photo-beat waveform appearance should be can see on screen, pay attention to opening regulated power supply switch when adjusting this step.
(8) block short range light with chopper 13 again, adjust half-reflecting mirror I 8, total reflection mirror II 6, total reflection mirror III 7,
Be all-trans prism I 10, the prism II 11 that is all-trans, be all-trans prism III 12, through half-reflecting mirror II 9, make long-range light and short range light half
The light of the same direction on reflecting mirror II9 is incident on photosurface central point, also can be appreciated that at this time clearly in oscillograph screen
Photo-beat waveform, it should 7,8 two steps are adjusted repeatedly, until distance Cheng Guangjun reaches this requirement.
(9) the photosurface orientation of photodiode can be realized by regulating device knob I 20 and knob II 21, as far as possible
Keep the amplitude of sinusoidal waveform maximum.
(10) the power supply open source of chopper, and the frequency adjusting knob of rotary chopper 13 are opened, to make oscillograph screen
The short range light and long-haul optical signal shown on curtain is stable.
Embodiment 5:
The measurement method of the light velocity, comprising the following steps:
S1: the output frequency of the ultrasonic wave of sinusoidal variations is incident on acousto-optic frequency shift in 1w or so in 50MHz or so, power
In device.Ultrasonic wave makes to generate standing wave in the medium of acousto-optic frequency shifters, forms a phase grating.Laser light incident acousto-optic frequency shifters
Afterwards, it can produce " photo-beat " signal with diffraction lights more than 2 kinds of frequencies in the emergent light of frequency shifter.The frequency of photo-beat signal
It is twice of incident ultrasound wave frequency rate, ultrasonic wave sinusoidal signal is linked into the frequency that can measure photo-beat signal on frequency meter；
S2: the beat frequency light for obtaining S1 step by total reflection mirror I5 passes through beat frequency between reflecting mirror I8 and chopper 13
Light is divided into short range light and long-range light, and short range light is directly over the photodiode that half-reflecting mirror 9 enters in opto-electronic receiver box 17
On, long-range light by total reflection mirror II6, total reflection mirror III12, the prism II11 that is all-trans, the prism 110 that is all-trans, be all-trans prism
III12, half-reflecting mirror 9 enter on the photodiode in opto-electronic receiver box 17；
S3: obtaining the phase difference of short range light and long-range light by opto-electronic receiver box 17 and oscillograph, and measures corresponding far and near
The optical path difference of photo-beat obtains photo-beat wavelength and calculates the light velocity.
Calculation formula is as follows:
All-wave method: c=Δ λ Δ f=Δ L (2F)；
Compare all-wave and half-wave phase method: c=Δ λ Δ f=4j (2F)；
In formula, c is light velocity value；Δ L is the optical path difference of distance Cheng Guang；F is the frequency of oscillation of power signal generator, Δ λ
For the wavelength of photo-beat, j be long-range light and process light by becoming reversed in the same direction when the sum of the moving distance of total reflection prism 11 and 12.
Light velocity measurement error example 1 (all-wave method):
Dipped beam journey: 0.1341m
Distance light journey:
(0.0732+0.0455+0.7351+0.7646+0.6114+0.6514+0.060+0.060+0. 060)=
3.0612m
Δ L=3.0612-0.1341=2.9271m
Δ f=2 × 50.152Mhz=1.00304 × 108 Hz
Light velocity c=Δ L Δ f=2.9360 × 108m/s
Percent difference
Light velocity measurement error example 2 (compares all-wave and half-wave phase method)
J=0.7512m
Δ λ=4j=3.0048m
Δ f=2 × 50.152Mhz=1.00304 × 108 Hz
Light velocity c=Δ λ Δ f=3.0139 × 108m/s
Percent difference
Embodiment of above is merely to illustrate the utility model, and is not limitation of the utility model, this field it is general
Logical technical staff can also make a variety of changes and modification in the case where not departing from the spirit and scope of the utility model.Cause
This, all equivalent technical solutions also belong to the scope of the utility model, and the scope of patent protection of the utility model should be by right
It is required that limiting.
Claims (10)
1. a kind of light velocity measurement device, including the transmitting module and receiving module being set on cabinet (24), it is characterised in that: institute
The transmitting module stated includes: the He-Ne laser (1) for being set to cabinet (24) surface, installation corresponding with He-Ne laser (1)
Acousto-optic frequency shifters (2), the light bar (4) of installation corresponding with acousto-optic frequency shifters (2), the total reflection mirror I of installation corresponding with light bar (4)
(5), the half-reflecting mirror I(8 of installation corresponding with total reflection mirror I(5) and mutual cooperation setting) and chopper (13), with half-reflecting mirror
I(8) and the total reflection mirror II(6 of the corresponding installation of chopper (13)), half-reflecting mirror II(9), it is corresponding with total reflection mirror II(6) to install
Total reflection mirror III(7), the prism II(11 that is all-trans of installation corresponding with total reflection mirror III(7)), it is right with the prism II(11 that is all-trans)
The prism I(10 that is all-trans that should be installed), the prism III(12 that is all-trans of installation corresponding with the prism I(10 that is all-trans)), with the prism III that is all-trans
(12) the half-reflecting mirror II(9 of corresponding installation).
2. a kind of light velocity measurement device according to claim 1, it is characterised in that: the receiving module includes being set to
Opto-electronic receiver box (17) on cabinet (24), the opto-electronic receiver box (17) is interior to be equipped with installation corresponding with half-reflecting mirror II(9)
Frequency divider (18), further respectively have knob I(20 on the opto-electronic receiver box (17)), knob II(21), window (19).
3. a kind of light velocity measurement device according to claim 2, it is characterised in that: opto-electronic receiver box (17) connection
There is oscillograph.
4. a kind of light velocity measurement device according to claim 1, it is characterised in that: the total reflection mirror I(5), be all-trans
Penetrate mirror II(6), total reflection mirror III(7), half-reflecting mirror I(8), half-reflecting mirror II(9) on be equipped with level (25).
5. a kind of light velocity measurement device according to claim 1, it is characterised in that: the prism II(11 that is all-trans) and it is complete
Anti- prism III(12) it is respectively arranged on sliding block (27), the sliding block is respectively arranged on guide rail (14,15), and described leads
Rail (14,15) is installed on cabinet (24).
6. a kind of light velocity measurement device according to claim 5, it is characterised in that: on the guide rail (14,15) respectively
It equipped with graduation mark, is offered on the sliding block (27) through-hole (27a), is equipped with bar magnet in the through-hole (27a).
7. a kind of light velocity measurement device according to claim 1, it is characterised in that: the total reflection mirror I(5), be all-trans
Penetrate mirror II(6), total reflection mirror III(7) side respectively correspond equipped with locator (26).
8. a kind of light velocity measurement device according to claim 7, it is characterised in that: the locator (26) is by least two
Block L-type magnetic sheet (28) is formed by stacking, and first positioning hole (28a) and second location hole are respectively equipped on the magnetic sheet (28)
The angle line (24a) with locator (26) cooperation is carved on (28b), the cabinet (24) surface.
9. a kind of light velocity measurement device according to claim 1, it is characterised in that: the total reflection mirror I(5), be all-trans
Penetrate mirror II(6), total reflection mirror III(7) be separately mounted on L-type supporting block (29), the supporting block (29) and cabinet (24)
Contact jaw is equipped with matching hole (29a).
10. a kind of light velocity measurement device according to claim 1, it is characterised in that: described cabinet (24) side is equipped with
Operation button (3).
Priority Applications (1)
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