CN104729458B - A kind of novel measuring distance meter based on hot light field bunching effect - Google Patents
A kind of novel measuring distance meter based on hot light field bunching effect Download PDFInfo
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- CN104729458B CN104729458B CN201510134725.4A CN201510134725A CN104729458B CN 104729458 B CN104729458 B CN 104729458B CN 201510134725 A CN201510134725 A CN 201510134725A CN 104729458 B CN104729458 B CN 104729458B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C3/00—Measuring distances in line of sight; Optical rangefinders
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Abstract
A kind of novel measuring distance meter based on hot light field bunching effect, including thermal light source (1), lens (2), aperture (3), polarization beam splitter (4), first beam splitter (5), chronotron (6), second beam splitter (7), semi-transparent semi-reflecting lens (8), part illuminator (9) to be measured, first detector (10), second detector (11) and coincidence measurement logic computer (12), coincidence measurement logic computer (12) does normalized secondorder correlation function and calculates and finally gives part illuminator (9) to be measured the distance between to semi-transparent semi-reflecting lens (8) to two paths of signals.Diastimeter of the present invention make use of the double velocity correlation characteristic of light field, not affected by atmospheric perturbation substantially, and the difficulty that conventional interference diastimeter can be overcome to overcome realizes anti-interference range capability, can be widely applied for the range measurement under complex environment.
Description
Technical field
The present invention relates to field of finding range, particularly a kind of novel measuring distance meter based on hot light field bunching effect, can not receive
The impact of atmospheric perturbation, realizes anti-interference range capability, can be widely applied to the range measurement under complex environment.
Background technology
Rule is the instrument for being used for range finding earliest, but over long distances or under complex environment, rule measurement becomes non-
It is often difficult.During the Second World War, the range radar that Britain develops first, realizes the rapid measure different azimuth on a fixing point
The instantaneous distance of the various targets in angle, realizes the historical breakthrough of ranging technology.Later with the development of electromagnetism and laser technology,
Laser is used for into field of finding range gradually, and First laser range finder is developed in Hughes Aircraft Company of the U.S. in 1961, due to
The laser range finder advantage such as have high precision, small volume and less weight, high resolution and interference resistance strong, obtained within a very long time
Develop rapidly, and define the ranging scheme of various ways.Current laser range finder can be just realized from nanometer to thousand of
Range finding in kilometer range.
Although current laser range finder is by the high penetrating power of laser, it is possible to achieve complex environment and overlength distance ability
Range finding, but rely solely on raising laser power and signal processing technology be difficult fundamentally to realize absolute capacity of resisting disturbance
Range finding, and the use of superpower laser is very harmful to human eye, it is therefore desirable to seek a kind of novel distance measuring scheme fundamentally
Solve this problem.
The content of the invention
Present invention solves the technical problem that being：Overcome the deficiencies in the prior art, there is provided a kind of to close based on hot light field second order
The anti-interference novel measuring distance meter of the bunching effect that connection characteristics exhibit goes out, it is possible to achieve capacity of resisting disturbance is found range, and is widely used in
Range measurement under complex environment.
The present invention technical solution be：A kind of novel measuring distance meter based on hot light field bunching effect, including thermal light source,
Lens, aperture, polarization beam splitter, the first beam splitter, chronotron, the second beam splitter, semi-transparent semi-reflecting lens, part illuminator to be measured,
One detector, the second detector and coincidence measurement logic computer, wherein part illuminator to be measured is positioned on part to be measured；Thermal light source
The hot light field for producing exposes to lens, and after light is assembled by lens, Jing apertures are projected to polarization beam splitter, and polarization beam splitter produces line
The first beam splitter is sent to after polarized light and produces through Beam and a branch of reflected light, and transmitted light is delivered to into the through chronotron
Two detectors, produce first signal of telecommunication after the transmitted light that the second detector reception delay device sends, and deliver to coincidence measurement logic
Computer, reflected light deliver to the second beam splitter, and after the second beam splitter receives reflected light, reflecting part reflected light is to semi-transparent semi-reflecting lens
Reflected, the light after reflection is delivered to the transmission of the second beam splitter by semi-transparent semi-reflecting lens, after the first detector receives the light after transmission
Second signal of telecommunication is produced, and delivers to coincidence measurement logic computer, coincidence measurement logic computer receives first signal of telecommunication and the
Normalized secondorder correlation function calculating is carried out after two signals of telecommunication, the time delay τ corresponding to secondorder correlation function peak value is obtained1；Half
When thoroughly semi-reflective mirror receives the part reflected light of the second beam splitter reflection, to part reflecting mirror to be measured, part to be measured is anti-for transmissive portions light splitting simultaneously
Penetrate mirror and transmissive portions light splitting is reflexed to into semi-transparent semi-reflecting lens and the second beam splitter, the first detector receives the light after transmission and produces the 3rd
The signal of telecommunication, and coincidence measurement logic computer is delivered to, coincidence measurement logic computer is entered with the 3rd signal of telecommunication to first signal of telecommunication
The normalized secondorder correlation function of row is calculated, and obtains the time delay τ corresponding to secondorder correlation function peak value2, and calculate part to be measured
Illuminator is the distance between to semi-transparent semi-reflecting lensWherein, Δ τ=τ2-τ1。
Present invention advantage compared with prior art is：
(1) it is of the invention compared with existing diastimeter, the detectable signal of two-way optical detection system is carried out by chronotron
Time synchronized, and coincidence counting is carried out to two path signal in coincidence measurement logic computer, it is to keep traditional diastimeter
Optical system, the local directed complete set of internal structure is carried out on the basis of overall appearance shape invariance, realize simple, workload is little；
(2) it is of the invention compared with existing diastimeter, a kind of new range finding is realized using hot light field double velocity correlation characteristic
Scheme, the diastimeter are not affected by atmospheric perturbation substantially, it is possible to achieve anti-interference range capability, can be widely applied to complex environment
Under range measurement；
(3) it is of the invention compared with existing diastimeter, under the conditions of constructed, it is only necessary to can just be realized using the pole low light level
Detection to distant object, can effectively reduce harm of the high power laser light to human eye；
(4) present invention can also realize the measurement of object under test Mean Speed, be that field of precision measurement introduces one kind entirely
New ranging scheme.
Description of the drawings
Fig. 1 is the Experimental equipment of the present invention.
Specific embodiment
The bunching effect of photon detects the probability meeting of second photon to detect after first photon through time delay τ
Reduce, i.e. secondorder correlation function g(2)(τ)<g(2)(0), this explanation photon tends to flock together, and hot light place is just presented
It is a kind of bunching effect.The bunching effect that hot light place presents, can calculate normalized second order by coincidence measurement method
Correlation function is obtained, i.e., when it is 0 to reach the time delay of the hot light of two beams of beam splitter, normalized secondorder correlation function value is 2, just
Show bunching effect, it is possible to use this bunching effect of hot light field, design the novel distance measuring based on hot light field bunching effect
Instrument.
A kind of novel measuring distance meter based on hot light field bunching effect, include as shown in Figure 1 thermal light source 1, lens 2, aperture 3,
Polarization beam splitter 4, the first beam splitter 5, chronotron 6, the second beam splitter 7, semi-transparent semi-reflecting lens 8, part illuminator to be measured 9, first are visited
Survey device 10, the second detector 11 and coincidence measurement logic computer 12.The hot light field that thermal light source 1 is produced delivers to lens 2, Jing Guotou
To aperture 3, the light that aperture 3 is projected first passes through polarization beam splitter 4 and becomes line polarized light 2 post-concentration of mirror, is re-fed into the first beam splitting
Device 5 produces through Beam and a branch of reflected light, and transmitted light (reference beam) is after chronotron 6 directly by the second detector 11
Receive, reflected light (measuring beam) is on 7 back reflection of the second beam splitter to semi-transparent semi-reflecting lens 8 then anti-through semi-transparent semi-reflecting lens 8
Penetrate, the light after reflection is transmitted through the second beam splitter 7, directly received by the first detector 10, adjust the time delay τ of chronotron, use
The output signal of 12 pairs of the first detectors 10 of coincidence measurement logic computer and the second detector 11 does normalized double velocity correlation
Function is calculated, and obtains the time delay τ corresponding to secondorder correlation function peak value1。
In addition, reflected light (measuring beam) is when the second beam splitter 7 is reflexed on semi-transparent semi-reflecting lens 8, some Jing
Semi-transparent semi-reflecting lens 8 are transmitted, and are transmitted on part reflecting mirror to be measured 9, through semi-transparent semi-reflecting lens 8 after part reflecting mirror 9 to be measured reflection
After transmiting with the second beam splitter 7, received by the first detector 10, adjust the time delay τ of chronotron, use coincidence measurement logic computer
The output signal of 12 pairs of the first detectors 10 and the second detector 11 is done normalized secondorder correlation function and is calculated, and obtains second order pass
Time delay τ corresponding to connection peak of function2。
Finally, 12 computation delay interval delta τ of coincidence measurement logic computer=τ2-τ1, calculate part illuminator to be measured 9 and arrive
The distance between semi-transparent semi-reflecting lens 8
Below diastimeter of the present invention is described in greater detail, wherein lens 2 are positioned over behind thermal light source 1, are used for
Meeting heat build-up light field is on the focal plane of lens 2；Aperture 3 is positioned on the focal plane of lens 2, for the size of limiting light source, from
And improve the visibility of normalization secondorder correlation function；Polarization beam splitter 4 is positioned over behind aperture 3, for filtering from aperture 3
The light of outgoing, the light from 3 outgoing of aperture become line polarized light after polarization beam splitter 4；First beam splitter 5 is positioned over polarization
Behind beam splitter 4, for producing reference beam and measuring beam；Second beam splitter 7 is positioned over 5 the reflected beams of the first beam splitter
In light path, for the reflection and transmission of measuring beam；Chronotron 6 is positioned in reference beam, for the time delay to reference path,
By the time delay for adjusting chronotron 6 so that reference path and the optical path through semi-transparent semi-reflecting lens 8 or part illuminator to be measured 9
Normalization secondorder correlation function obtain maximum.
First detector 10 and the second detector 11 are respectively placed in behind the second beam splitter 7 and chronotron 6, for connecing
The photon of measuring beam and reference beam is received, the optical signal for receiving is converted to into the signal of telecommunication, while by electric signal output to symbol
Close measurement logic computer 12；Coincidence measurement logic computer 12 distinguishes the first detector 10 and the second detector 11 connects, root
According to the output signal of two detectors, normalization secondorder correlation function is calculated.
Semi-transparent semi-reflecting lens 8 are positioned in optical path, as the reference position of range finding, by the time delay for adjusting chronotron 6,
So that reference path obtains maximum with the normalization secondorder correlation function through 8 optical path of semi-transparent semi-reflecting lens, now record
Time delay τ1Value；Part illuminator to be measured 9 is positioned on part to be measured, as range finding target body, by the time delay for adjusting chronotron 6, is made
Obtain reference path and maximum is obtained with the normalization secondorder correlation function through 9 optical path of part illuminator to be measured, now record
Time delay τ2Value；According to two time delay τ1And τ2, calculate Δ τ=τ2-τ1Value, it is possible to calculate part illuminator 9 to be measured to half
The distance between saturating semi-reflective mirror 8
In addition, diastimeter of the present invention can be additionally used in Mean Speed measurement.If in semi-transparent semi-reflecting lens 8 and part reflecting mirror to be measured
9 position, it is each that an atomic clock offer measure of time benchmark is provided, then by measuring part displacement Δ l to be measured twice, together
The whole story time Δ t of Shi Jilu part motions to be measured, it is possible to calculate Mean Speed v of part movement to be measured in excess of export short time interval
=Δ l/ Δ t.Therefore diastimeter of the present invention introduces a kind of brand-new ranging scheme for field of precision measurement, is also quantum optices
Technology application provide new approaches.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (1)
1. a kind of novel measuring distance meter based on hot light field bunching effect, it is characterised in that including thermal light source (1), lens (2), aperture
(3), polarization beam splitter (4), the first beam splitter (5), chronotron (6), the second beam splitter (7), semi-transparent semi-reflecting lens (8), part to be measured
Illuminator (9), the first detector (10), the second detector (11) and coincidence measurement logic computer (12), wherein part to be measured is anti-
Light microscopic is positioned on part to be measured；The hot light field that thermal light source (1) is produced exposes to lens (2), lens (2) light is assembled after Jing apertures
(3) project to polarization beam splitter (4), polarization beam splitter (4) is sent to the first beam splitter (5) after producing line polarized light, first point
Beam device (5) produces through Beam and a branch of reflected light, and transmitted light is delivered to the second detector (11) through chronotron (6),
First signal of telecommunication is produced after the transmitted light that second detector (11) reception delay device (6) sends, and delivers to coincidence measurement logic meter
Device (12) is calculated, reflected light delivers to the second beam splitter (7), and the second beam splitter (7) is reflected to reflected light after receiving reflected light, so
The reflected light that obtains of reflection is sent to semi-transparent semi-reflecting lens (8) afterwards to be reflected, the light after reflection is delivered to the by semi-transparent semi-reflecting lens (8)
Two beam splitters (7) are transmitted, and are produced second signal of telecommunication, and are delivered to coincidence measurement and patrol after the light after the first detector (10) reception transmission
Computer (12) is collected, coincidence measurement logic computer (12) carries out normalized two after receiving first signal of telecommunication and second signal of telecommunication
Rank correlation function is calculated, and obtains the time delay τ corresponding to secondorder correlation function peak value1；Semi-transparent semi-reflecting lens (8) receive the second beam splitter
(7) while transmissive portions light splitting is to part reflecting mirror (9) to be measured during the part reflected light for reflecting, part reflecting mirror (9) to be measured is by transmissive portions
To semi-transparent semi-reflecting lens (8) and the second beam splitter (7), it is electric that the first detector (10) receives the light generation the 3rd after transmission to dichroic reflection
Signal, and coincidence measurement logic computer (12) is delivered to, coincidence measurement logic computer (12) is electric with the 3rd to first signal of telecommunication
The secondorder correlation function that signal is normalized is calculated, and obtains the time delay τ corresponding to secondorder correlation function peak value2, and calculate
Part illuminator (9) to be measured is the distance between to semi-transparent semi-reflecting lens (8)Wherein, Δ τ=τ2-τ1, c is the light velocity.
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| CN106597467B (en) * | 2016-11-22 | 2019-05-24 | 北京航天控制仪器研究所 | A kind of rangefinder based on HOM principle of interference |
| CN106646643B (en) * | 2016-11-22 | 2019-01-11 | 北京航天控制仪器研究所 | Gravimeter based on hot light field bunching effect |
| CN109901182B (en) * | 2019-02-18 | 2021-08-03 | 杭州电子科技大学 | Laser ranging device and method based on second-order intensity correlation function |
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| JP3617709B2 (en) * | 1995-11-10 | 2005-02-09 | 株式会社日本自動車部品総合研究所 | Distance measuring device |
| US6426835B1 (en) * | 1999-03-23 | 2002-07-30 | Olympus Optical Co., Ltd. | Confocal microscope |
| CN1327240C (en) * | 2004-05-20 | 2007-07-18 | 中国科学院上海技术物理研究所 | Pulse echo treating method and device for laser range finder |
| CN102866405A (en) * | 2012-09-13 | 2013-01-09 | 西北工业大学 | Thermal-optical ranging method based on two-order coherence |
| CN103163529B (en) * | 2013-03-26 | 2015-07-15 | 上海交通大学 | Distance measuring system based on pseudo thermal light second-order relevance |
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