CN206131995U - Femto second laser range unit - Google Patents
Femto second laser range unit Download PDFInfo
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- CN206131995U CN206131995U CN201621093688.3U CN201621093688U CN206131995U CN 206131995 U CN206131995 U CN 206131995U CN 201621093688 U CN201621093688 U CN 201621093688U CN 206131995 U CN206131995 U CN 206131995U
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- light
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- spectroscope
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Abstract
The utility model provides a femto second laser range unit, includes a reference light path, the 2nd reference light path and measurement optical path, a reference light path with the 2nd reference light path has fixed optical path difference, a reference light path with be provided with the shutter on the 2nd reference light path respectively, the shutter is used for switching over reference light path in order to use corresponding reference light to measure at the range finding in -process. Utilize the utility model discloses a blind spot problem that the femto second laser range finding exists can effectively be solved to the device.
Description
Technical field
The utility model is related to laser ranging technique field, especially a kind of femtosecond laser range unit.
Background technology
At present for laser ranging instrument, improve a lot in the performances such as certainty of measurement, range and range finding speed respectively,
But industrial production, national defence and scientific research field in modern development in science and technology etc. are realizing absolute distance survey to precise distance measurement technology
More requirements at the higher level are proposed to measuring speed, three aspects of range and precision while amount.Existing laser range finder cannot
Meet growing Technical Development Requirement., there is laser ranging technique in the new femto-second laser that latter stage in 20th century occurs
Revolutionary favourable turn, rapidly becomes a big focus of research of finding range in the world.
In advanced femtosecond laser range measurement principle development process, one of its principle defect be measurement optical interference signals with
The aliasing occurred when close with reference to optical interference signals causes measurement to continue, so as to limit the range finding model of whole instrument
Enclose, the region that the phenomenon occurs is referred to as dead band.
Utility model content
Main purpose of the present utility model is to overcome the deficiencies in the prior art, there is provided a kind of femtosecond laser range unit,
Solve above-mentioned dead-time problem.
For achieving the above object, the utility model is employed the following technical solutions：
A kind of femtosecond laser range unit, including the first reference path, the second reference path and optical path, described
One reference path and second reference path have fixed optical path difference, first reference path and second reference light
Shutter is respectively arranged with road, the shutter is used to switch in ranging process reference path to carry out using corresponding reference light
Measurement.
Further：
First reference path, the second reference path and optical path are through the configuration realization of following light path, the light
Road configuration include the first reflective mirror, the second reflective mirror, the 3rd reflective mirror, the first spectroscope, the second spectroscope, the first shutter, the
Two shutters, the flashlight of femto-second laser is divided into reference light and measurement light, the 3rd reflective mirror and quilt by first spectroscope
Survey thing to be installed together, the reference light is divided into the first reference light and the second reference light by second spectroscope, described the
One reference light passes through first shutter after described second spectroscopical reflection, then through the reflection of first reflective mirror
Afterwards back through first shutter, after again passing by described second spectroscopical reflection, after first spectroscope with
The local oscillator light of femto-second laser converges in the same direction；Second reference light is after second spectroscope by described
Second shutter, then after the reflection of second reflective mirror, back through second shutter, second spectroscope and
Converge in the same direction with the local oscillator light of femto-second laser after first spectroscope, the measurement light is anti-through the described 3rd
First spectroscope, then the local oscillator after described first spectroscopical reflection with femto-second laser are returned after the reflection of light microscopic
Light converges in the same direction.
The light path configuration also includes the 3rd shutter being arranged between first spectroscope and the 3rd reflective mirror.
The light path configuration also includes the semi-transparent semi-reflecting lens being arranged in local oscillator light light path, passes through from the semi-transparent semi-reflecting lens
Local oscillator light converge with the measurement light, first reference light and second reference light reflected on the semi-transparent semi-reflecting lens
Close in the same direction.
First shutter and second shutter are connected respectively to motor, are opened and closed by the motor control.
The beneficial effects of the utility model include：
Femtosecond laser range unit of the present utility model has switchable two reference beams road, can control shutter control double
Reference path is switched in good time, so as to, using the device can dead-time problem in the range finding of effectively solving femtosecond laser, expand whole
The finding range of measuring instrument, realizes precisely range finding.The utility model can be widely applied to it is various on a large scale, real-time femtosecond swash
Light tracking range finding field.
Description of the drawings
Fig. 1 is the range measurement principle optical system schematic diagram of the utility model embodiment；
Fig. 2, Fig. 3, Fig. 4 represent that measured object is being gradually distance from the process of laser range finder；
Fig. 5, Fig. 6, Fig. 7 represent that measured object is moving closer to the process of laser range finder.
Specific embodiment
Embodiment of the present utility model is elaborated below.It is emphasized that the description below is only example
Property, rather than in order to limit scope of the present utility model and its application.
Refering to Fig. 1, in one embodiment, a kind of femtosecond laser range unit, including the first reference path, the second reference
The optical path difference of light path and optical path, first reference path and second reference path with fixation, described first
Shutter is respectively arranged with reference path and second reference path, the shutter is used to switch reference light in ranging process
Road using corresponding reference light being measured.
As shown in figure 1, in a preferred embodiment, first reference path, the second reference path and measurement light B roads
Realize through the configuration of following light path, light path configuration include the first reflective mirror M1, the second reflective mirror M2, the 3rd reflective mirror M3,
First spectroscope S1, the second spectroscope S2, the first shutter O1, the second shutter O2, the 3rd reflective mirror M3 is arranged on one with measured object
Rise, be synchronization-moving with measured object in ranging process, D is testing distance, the flashlight S of femto-second laser is by described the
One spectroscope S1 point is reference light and measurement light B, the reference light by the second spectroscope S2 point for the first reference light A and
Second reference light A1, the first reference light A pass through the first shutter O1 after the reflection of the second spectroscope S2, then
Back through the first shutter O1 after the reflection of the first reflective mirror M1, again pass by the second spectroscope S2's
After reflection, converged in the same direction with the local oscillator light L of femto-second laser after the first spectroscope S1；Second ginseng
Light A1 is examined after the second spectroscope S2 by the second shutter O2, then through the reflection of the second reflective mirror M2
Afterwards, back through after the second shutter O2, the second spectroscope S2 and the first spectroscope S1 with femto-second laser
Local oscillator light L converge in the same direction, the measurement light B returns described first after the reflection of the 3rd reflective mirror M3
Spectroscope S1, then converge in the same direction with the local oscillator light L of femto-second laser after the reflection of the first spectroscope S1.
As shown in figure 1, photoelectric detector PD is used for receiving the optical signalling in measurement, electric signal is translated into for below
Computing module use.
As shown in figure 1, in a further preferred embodiment, the light path configuration also includes being arranged on first light splitting
The 3rd shutter O3 between mirror S1 and the 3rd reflective mirror M3.
As shown in figure 1, in a preferred embodiment, the light path configuration also includes half be arranged in local oscillator light L light paths
Saturating semi-reflective mirror, the local oscillator light L and measurement light B reflected on the semi-transparent semi-reflecting lens passed through from the semi-transparent semi-reflecting lens,
The first reference light A and the second reference light A1 converge in the same direction.
The first shutter O1 and the second shutter O2 can be connected respectively to motor (not shown), by the motor
Control opening and closing.Motor can be integrated in shutter structure.Other 3rd shutter O3 can also be equipped with motor to be controlled.
Refering to Fig. 1 to Fig. 7, a kind of femtosecond laser distance-finding method, it can use the femtosecond laser of any of the above-described embodiment to survey
Found range away from device；
Interference signal wherein for the first reference light A and the second reference light A1 sets a dead zone range,
In data acquisition, when the dead zone range of the reference light that the interference signal of the measurement light B is entered in being currently in use, control
The shutter corresponding to the road reference light is closed, and opens the corresponding shutter of another road reference light；
Wherein calculate measured object apart from when, using the optical path difference of the fixation to the switching institute band between two-way reference light
The deviation of the measurement distance come is compensated.
Refering to Fig. 1 to Fig. 4, in a preferred embodiment, in measured object in the case where femto-second laser is gradually distance from, work as survey
When amount light is introduced into the dead band of the first reference light A, opens first shutter and close second shutter, when measurement light is entered
During the first reference light A dead bands, open second shutter and close first shutter.
Refering to Fig. 1, Fig. 5 to Fig. 7, in a preferred embodiment, in measured object in the case where femto-second laser is moved closer to,
When measurement light is introduced into the dead band of the second reference light A1, opens second shutter and simultaneously close first shutter, work as measurement
When light enters the second reference light A1 dead bands, open first shutter and close second shutter.
In a preferred embodiment, measured object distance is calculated according to below equation：
Wherein c is the light velocity, ngFor air refraction, f1 is the signal light frequency of femtosecond laser, and f2 is the sheet of femtosecond laser
Shake light frequency, Δ f=f1-f2, Δ τ be reference light and measurement light interference signal in time domain because of the time delay that distance is produced, root
Calculated according to the data of Real-time Collection, the distance is calculated to be included with the optical path difference compensation of the fixation because switching reference path
The deviation brought.
The principle of the utility model specific embodiment is further illustrated below in conjunction with Fig. 1 to 7.
Femtosecond laser range unit is provided with two-way reference light A, A1 and measures light B all the way, and two-way reference light has to be fixed
Optical path difference, two-way reference light is used alternatingly in ranging process according to measurement optical interference signals position.Using shutter control two-way
The use state of reference light and measurement light.Calculate apart from when by fixed optical path difference compensation two-way reference light switching state when bring
Measurement distance difference.
Optical interference signals are measured in original range measurement principle cannot be divided with detector when being sufficiently close to reference to optical interference signals
Two interference signal attributes are distinguished, so as to cause gathered data to cause confusion, range finding cannot proceed, dead band of referred to as finding range shows
As；By increasing reference light all the way, the reference light is homologous with former reference light and with fixed optical path difference, used in normal range finding
One of reference path, when fast close reference light dead band, another road reference light is opened, and reference light is now used in closing,
Switch reference path, in data processing compensate the fixed optical path difference distance that light path switches band.
In light channel structure design, a shutter is installed behind the light spectroscope of every road, by the switch of motor control shutter
State, laser is participated in range finding by shutter when shutter is opened；Set with reference to interference signal for each in data acquisition
A fixed dead zone range, when optical interference signals are measured into dead zone range corresponding signal will be given, and electric machine control system is just
Corresponding shutter can according to circumstances be switched.
In computation and measurement distance, shutter switching each time can all produce two with reference to the corresponding distance of photofixation optical path difference
The change of degree, compensated distance is increased and decreased accordingly in calculating process to the distance change.
Can be judged and be marked in the interference signal of the road light of normal work Qian Dui tri-, while referring to optical interference signals
Both sides arrange suitable dead zone range, and normal range finding is proceeded by after confirmation is errorless；Choose wherein all the way suitable reference light with
Measurement light is combined, and the distance value that determinand is carried out is acquired, and when light is measured into reference light dead band, system can be by fast
Door opens another road reference light and judges its correctness, the reference light that errorless rear closing original is used is confirmed, using new reference light
Measure, corresponding reference path switching is repeated with this rule, until range finding terminates.
The effect of shutter is the use state for controlling light, and corresponding light all the way is just not involved in range finding, shutter during shutter close
During opening, respective optical path is effective optical path, and the action of shutter is operated according to the marking signal of range finding actual conditions feedback, surveyed
It is marked away from Qian Xuduige roads optical signal is started, now needs to open corresponding shutter successively according to procedure stipulation, mark is completed
After close wherein all the way with reference to optical shutter, range finding can be proceeded by, in normal range finding, when measurement light enters a certain dead band
When, fast goalkeeper starts action, and according to marking signal untapped reference path shutter is opened successively, closes already at dead band shape
The light path shutter of state, by that analogy until range finding terminates.
Fig. 2, Fig. 3, Fig. 4 represent that measured object is being gradually distance from the process of laser range finder；Fig. 5, Fig. 6, Fig. 7 represent measured object
Moving closer to the process of laser range finder.SXXThe position of corresponding interference signal is represented, wherein two interference signals of measurement light B
Position be S0B、S1B, the position of two interference signals of the first reference light A is S0A、S1A, two interference of the second reference light A1
The position of signal is S0A1、S1A1.What Fig. 2 was represented be measure light B interference signal not in any dead band, using the first reference light
A；What Fig. 3 was represented is to measure light B to enter in the dead zone range of the first reference light A, now switches to the second reference light A1；Fig. 4 tables
What is shown is to measure light B to enter in the dead zone range of the second reference light A1, now switches to the first reference light A.What Fig. 5 was represented is to survey
Amount light B does not use the second reference light A1 before this state in any dead band, now；What Fig. 6 was represented is that measurement light B enters the
In the dead zone range of two reference light A1, the first reference light A is now switched to；What Fig. 7 was represented is that measurement light B enters the first reference light
In the dead zone range of A, the second reference light A1 is now switched to.
The measurement distance for calculating object can be according to below equation：
Wherein c is the light velocity；ngFor air refraction, generally as fixed constant in engineering optics；Range finding front light-source system
Signal light frequency f1 and local oscillator light frequency f2 of middle femtosecond laser is determination value through locked mode, and highly stable, Δ f=f1-
The value of f2 also can determine before range finding；Δ τ be two interference signals in time domain because of the time delay that distance is produced, according to adopting in real time
Collection data are calculated.
Computation and measurement apart from when, due to switch reference path after calculate reference point change, the distance value of calculating
Droop can be produced, the deviation that switching-over light path brings is corrected by fixed optical path difference compensation.
Through experimental verification, the utility model can accurately solve the dead-time problem that conventional ranging scheme is present.
Above content is with reference to concrete/preferred embodiment further detailed description of the utility model, no
Energy identification is of the present utility model to be embodied as being confined to these explanations.For the common skill of the utility model art
For art personnel, without departing from the concept of the premise utility, it can also make to the embodiment that these have been described
Some replacements or modification, and these are substituted or variant should all be considered as belonging to protection domain of the present utility model.
Claims (5)
1. a kind of femtosecond laser range unit, it is characterised in that including the first reference path, the second reference path and measurement light
Road, first reference path and second reference path have a fixed optical path difference, first reference path and described
Shutter is respectively arranged with second reference path, the shutter is used to switch in ranging process reference path with using corresponding
Reference light is measured.
2. femtosecond laser range unit as claimed in claim 1, it is characterised in that first reference path, the second reference
Light path and optical path realize through the configuration of following light path, the light path configuration include the first reflective mirror, the second reflective mirror, the
Three reflective mirrors, the first spectroscope, the second spectroscope, the first shutter, the second shutter, the flashlight of femto-second laser is by described the
One spectroscope is divided into reference light and measurement light, and the 3rd reflective mirror is installed together with measured object, and the reference light passes through institute
State the second spectroscope and be divided into the first reference light and the second reference light, first reference light is through described second spectroscopical reflection
Afterwards by first shutter, then again pass by back through first shutter after the reflection of first reflective mirror
After second spectroscopical reflection, same direction is merged in the local oscillator light of femto-second laser after first spectroscope
On；Second reference light passes through second shutter after second spectroscope, then through second reflective mirror
After reflection, back through after second shutter, second spectroscope and first spectroscope with femto-second laser
Local oscillator light converges in the same direction, and the measurement light returns first light splitting after the reflection of the 3rd reflective mirror
Mirror, then converge in the same direction with the local oscillator light of femto-second laser after described first spectroscopical reflection.
3. femtosecond laser range unit as claimed in claim 2, it is characterised in that the light path configuration also includes being arranged on institute
State the 3rd shutter between the first spectroscope and the 3rd reflective mirror.
4. femtosecond laser range unit as claimed in claim 2 or claim 3, it is characterised in that the light path configuration also includes arranging
Semi-transparent semi-reflecting lens in local oscillator light light path, the local oscillator light passed through from the semi-transparent semi-reflecting lens is anti-with the semi-transparent semi-reflecting lens
The measurement light, first reference light and second reference light penetrated converges in the same direction.
5. femtosecond laser range unit as claimed in claim 2 or claim 3, it is characterised in that first shutter and described second
Shutter is connected respectively to motor, is opened and closed by the motor control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621093688.3U CN206131995U (en) | 2016-09-29 | 2016-09-29 | Femto second laser range unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621093688.3U CN206131995U (en) | 2016-09-29 | 2016-09-29 | Femto second laser range unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206131995U true CN206131995U (en) | 2017-04-26 |
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ID=58571715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621093688.3U Withdrawn - After Issue CN206131995U (en) | 2016-09-29 | 2016-09-29 | Femto second laser range unit |
Country Status (1)
| Country | Link |
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| CN (1) | CN206131995U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289073A (en) * | 2016-09-29 | 2017-01-04 | 清华大学深圳研究生院 | Femtosecond laser range unit and method |
| CN110174676A (en) * | 2019-04-30 | 2019-08-27 | 深圳市速腾聚创科技有限公司 | Distance measuring method, system and the equipment of laser radar |
-
2016
- 2016-09-29 CN CN201621093688.3U patent/CN206131995U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289073A (en) * | 2016-09-29 | 2017-01-04 | 清华大学深圳研究生院 | Femtosecond laser range unit and method |
| CN106289073B (en) * | 2016-09-29 | 2018-12-14 | 清华大学深圳研究生院 | Femtosecond laser range unit and method |
| CN110174676A (en) * | 2019-04-30 | 2019-08-27 | 深圳市速腾聚创科技有限公司 | Distance measuring method, system and the equipment of laser radar |
| CN110174676B (en) * | 2019-04-30 | 2021-05-14 | 深圳市速腾聚创科技有限公司 | Laser radar ranging method, system and equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170426 Effective date of abandoning: 20181214 |
|
| AV01 | Patent right actively abandoned |