CN104729458A - Novel distance measuring instrument based on thermal filed bunching effect - Google Patents
Novel distance measuring instrument based on thermal filed bunching effect Download PDFInfo
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- CN104729458A CN104729458A CN201510134725.4A CN201510134725A CN104729458A CN 104729458 A CN104729458 A CN 104729458A CN 201510134725 A CN201510134725 A CN 201510134725A CN 104729458 A CN104729458 A CN 104729458A
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- beam splitter
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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
The invention discloses a novel distance measuring instrument based on a thermal filed bunching effect. The novel distance measuring instrument comprises a light source (1), a lens (2), a pore (3), a polarization beam splitter (4), a first beam splitter (5), a time delayer (6), a second beam splitter (7), a half-transparent and half-reflecting mirror (8), a to-be-detected part reflector (9), a first detector (10), a second detector (11) and an accordance measurement logic calculator (12), wherein normalized second-order correlation functional calculation is carried out on two paths of signals to finally obtain the distance between the to-be-detected part reflector (9) and the half-transparent and half-reflecting mirror (8). According to the distance measuring instrument, by virtue of the second-order correlation characteristic of the light field, the distance measuring instrument is basically not affected by atmospheric disturbance; the difficulty that a traditional interference distance measuring instrument cannot overcome can be overcome by suing the instrument disclosed by the invention; the anti-interference distance measuring capacity is realized; and the novel distance measuring instrument can be widely applied to distance measurement in a complicated environment.
Description
Technical field
The present invention relates to range finding field, particularly a kind of novel measuring distance meter based on thermo-optical field bunching effect, by the impact of atmospheric disturbance, anti-interference range capability can not be realized, the range observation under complex environment can be widely used in.
Background technology
Rule is the instrument the earliest for finding range, but under long distance or complex environment, rule measurement becomes very difficult.During the Second World War, the range radar that first Britain develop, achieves the instantaneous distance of the various target of rapid test different orientations on a point of fixity, achieves the historical breakthrough of ranging technology.Afterwards along with the development of electromagnetism and laser technology, gradually laser is used for the field of finding range, and develop First laser range finder in Hughes Aircraft Company of the U.S. in 1961, due to laser range finder have that precision is high, the advantage such as the high and interference resistance of small volume and less weight, resolution is strong, obtain within a very long time and develop rapidly, and define the ranging scheme of various ways.Current laser range finder just can realize finding range in several thousand kilometer range from nanometer.
Although current laser range finder relies on the high penetrating power of laser, complex environment and the range finding of overlength distance ability can be realized, but only rely on raising laser power and signal processing technology to be difficult to fundamentally realize absolute antijamming capability range finding, and the use of superpower laser is very harmful to human eye, therefore needs to seek a kind of Novel distance measuring scheme and fundamentally address this problem.
Summary of the invention
The technical matters that the present invention solves is: overcome the deficiencies in the prior art, provide a kind of anti-interference novel measuring distance meter of the bunching effect gone out based on thermo-optical field double velocity correlation characteristics exhibit, antijamming capability range finding can be realized, and the range observation under being widely used in complex environment.
Technical solution of the present invention is: a kind of novel measuring distance meter based on thermo-optical field bunching effect, comprise thermal light source, lens, aperture, polarization beam splitter, the first beam splitter, chronotron, the second beam splitter, semi-transparent semi-reflecting lens, to be measured reflective mirror, the first detector, the second detector and coincidence measurement logic computer, wherein to be measured reflective mirror is positioned on to be measured, the thermo-optical field that thermal light source produces exposes to lens, lens penetrate to polarization beam splitter through aperture after being assembled by light, polarization beam splitter is sent to the first beam splitter and produces through Beam and a branch of reflected light after producing linearly polarized light, and transmitted light is delivered to the second detector through chronotron, the first electric signal is produced after the transmitted light that second detector reception delay device sends, and deliver to coincidence measurement logic computer, reflected light delivers to the second beam splitter, after second beam splitter receives reflected light, reflecting part reflected light reflects to semi-transparent semi-reflecting lens, light after reflection is delivered to the second beam splitter transmission by semi-transparent semi-reflecting lens, the second electric signal is produced after light after first detector receives transmission, and deliver to coincidence measurement logic computer, coincidence measurement logic computer carries out normalized secondorder correlation function calculating after receiving the first electric signal and the second electric signal, obtain the time delay τ corresponding to secondorder correlation function peak value
1, when semi-transparent semi-reflecting lens receives the part reflected light of the second beam splitter reflection, transmissive portions light splitting is simultaneously to be measured catoptron, transmissive portions light splitting is reflexed to semi-transparent semi-reflecting lens and the second beam splitter by be measured catoptron, first detector receives the light after transmission and produces the 3rd electric signal, and deliver to coincidence measurement logic computer, coincidence measurement logic computer calculates the secondorder correlation function that the first electric signal and the 3rd electric signal are normalized, and obtains the time delay τ corresponding to secondorder correlation function peak value
2, and calculate the distance between to be measured reflective mirror to semi-transparent semi-reflecting lens
wherein, Δ τ=τ
2-τ
1.
The present invention's advantage is compared with prior art:
(1) the present invention is compared with existing stadimeter, the detectable signal of two-way optical detection system is carried out time synchronized by chronotron, and in coincidence measurement logic computer, coincidence counting is carried out to two path signal, it is the local directed complete set carrying out inner structure on the basis of the optical system keeping traditional stadimeter, overall appearance shape invariance, realize simple, workload is little;
(2) the present invention is compared with existing stadimeter, thermo-optical field double velocity correlation characteristic is utilized to achieve a kind of novel ranging scheme, this stadimeter does not affect by atmospheric disturbance substantially, can realize anti-interference range capability, can be widely used in the range observation under complex environment;
(3) the present invention is compared with existing stadimeter, under constructed condition, only needs to utilize the detection that the pole low light level just can realize distant object, effectively can reduce the harm of high power laser light to human eye;
(4) the present invention can also realize the measurement of object under test mean speed, for field of precision measurement introduces a kind of brand-new ranging scheme.
Accompanying drawing explanation
Fig. 1 is Experimental equipment of the present invention.
Embodiment
The bunching effect of photon is for detecting through time delay τ after first photon, and the probability detecting second photon can reduce, i.e. secondorder correlation function g
(2)(τ) <g
(2)(0), this illustrates that photon tends to flock together, and what thermo-optical place presented is exactly a kind of bunching effect.The bunching effect that thermo-optical place presents, normalized secondorder correlation function can be calculated by coincidence measurement method to obtain, namely when the time delay of the two bundle thermo-opticals arriving beam splitter is 0, normalized secondorder correlation function value is 2, just show bunching effect, this bunching effect of thermo-optical field can be utilized, design the novel measuring distance meter based on thermo-optical field bunching effect.
Based on a novel measuring distance meter for thermo-optical field bunching effect, comprise 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, to be measured reflective mirror 9, first detector 10, second detector 11 and coincidence measurement logic computer 12 as shown in Figure 1.Lens 2 are delivered in the thermo-optical field that thermal light source 1 produces, through lens 2 post-concentration to aperture 3, the light that aperture 3 penetrates first becomes linearly polarized light through polarization beam splitter 4, be sent to the first beam splitter 5 again and produce through Beam and a branch of reflected light, transmitted light (reference beam) is directly received by the second detector 11 after chronotron 6, reflected light (measuring beam) through the second beam splitter 7 back reflection on semi-transparent semi-reflecting lens 8, reflect through semi-transparent semi-reflecting lens 8 again, light after reflection is through the second beam splitter 7 transmission, directly received by the first detector 10, the time delay τ of adjustment chronotron, the calculating of normalized secondorder correlation function is done by the output signal of coincidence measurement logic computer 12 to the first detector 10 and the second detector 11, obtain the time delay τ corresponding to secondorder correlation function peak value
1.
In addition, reflected light (measuring beam) is when the second beam splitter 7 reflexes on semi-transparent semi-reflecting lens 8, some is through semi-transparent semi-reflecting lens 8 transmission, be transmitted on to be measured catoptron 9, after to be measured catoptron 9 reflects after semi-transparent semi-reflecting lens 8 and the second beam splitter 7 transmission, received by the first detector 10, the time delay τ of adjustment chronotron, do the calculating of normalized secondorder correlation function by the output signal of coincidence measurement logic computer 12 to the first detector 10 and the second detector 11, obtain the time delay τ corresponding to secondorder correlation function peak value
2.
Finally, coincidence measurement logic computer 12 computation delay interval delta τ=τ
2-τ
1, calculate the distance between to be measured reflective mirror 9 to semi-transparent semi-reflecting lens 8
Specifically illustrate stadimeter of the present invention below, wherein lens 2 are positioned over after thermal light source 1, for the focal plane of meeting solar heat hot light field to lens 2; Aperture 3 is positioned on the focal plane of lens 2, for limiting the size of light source, thus improves the visibility of normalization secondorder correlation function; Polarization beam splitter 4 is positioned over after aperture 3, for filtering the light from aperture 3 outgoing, from the light of aperture 3 outgoing after polarization beam splitter 4, becomes linearly polarized light; First beam splitter 5 is positioned over after polarization beam splitter 4, for generation of reference beam and measuring beam; Second beam splitter 7 is positioned in the first beam splitter 5 folded light beam light path, for reflection and the transmission of measuring beam; Chronotron 6 is positioned in reference beam, for the time delay to reference path, by adjusting the time delay of chronotron 6, makes reference path obtain maximal value with the normalization secondorder correlation function of the optical path through semi-transparent semi-reflecting lens 8 or to be measured reflective mirror 9.
First detector 10 and the second detector 11 are positioned over after the second beam splitter 7 and chronotron 6 respectively, for receiving the photon of measuring beam and reference beam, the light signal received is converted to electric signal, electric signal is outputted to coincidence measurement logic computer 12 simultaneously; Coincidence measurement logic computer 12 respectively the first detector 10 is connected with the second detector 11, according to the output signal of two detectors, calculates normalization secondorder correlation function.
Semi-transparent semi-reflecting lens 8 is positioned in optical path, as the reference position of range finding, by adjusting the time delay of chronotron 6, making reference path obtain maximal value with the normalization secondorder correlation function through semi-transparent semi-reflecting lens 8 optical path, now recording time delay τ
1value; To be measured reflective mirror 9 is positioned on to be measured, as range finding target body, by adjusting the time delay of chronotron 6, making reference path obtain maximal value with the normalization secondorder correlation function through to be measured reflective mirror 9 optical path, now recording time delay τ
2value; According to two time delay τ
1and τ
2, calculate Δ τ=τ
2-τ
1value, just can calculate the distance between to be measured reflective mirror 9 to semi-transparent semi-reflecting lens 8
In addition, stadimeter of the present invention also can be used for mean speed measurement.If in the position of semi-transparent semi-reflecting lens 8 and to be measured catoptron 9, each placement atomic clock provides time measurement benchmark, so by twice measurement to be measured displacement Δ l, record time at the whole story Δ t of to be measured motion simultaneously, just can calculate the mean speed v=Δ l/ Δ t of to be measured movement in excess of export short time interval.Therefore stadimeter of the present invention is that field of precision measurement introduces a kind of brand-new ranging scheme, also for the technology application of quantum optics provides new approaches.
The content be not described in detail in instructions of the present invention belongs to the known technology of those skilled in the art.
Claims (1)
1. the novel measuring distance meter based on thermo-optical field bunching effect, it is characterized in that comprising 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), to be measured reflective mirror (9), the first detector (10), the second detector (11) and coincidence measurement logic computer (12), wherein to be measured reflective mirror is positioned on to be measured, the thermo-optical field that thermal light source (1) produces exposes to lens (2), lens (2) penetrate to polarization beam splitter (4) through aperture (3) after being assembled by light, polarization beam splitter (4) is sent to the first beam splitter (5) and produces through Beam and a branch of reflected light after producing linearly polarized light, and transmitted light is delivered to the second detector (11) through chronotron (6), the first electric signal is produced after the transmitted light that second detector (11) reception delay device (6) sends, and deliver to coincidence measurement logic computer (12), reflected light delivers to the second beam splitter (7), after second beam splitter (7) receives reflected light, reflecting part reflected light reflects to semi-transparent semi-reflecting lens (8), light after reflection is delivered to the second beam splitter (7) transmission by semi-transparent semi-reflecting lens (8), the second electric signal is produced after light after first detector (10) receives transmission, and deliver to coincidence measurement logic computer (12), coincidence measurement logic computer (12) carries out normalized secondorder correlation function calculating after receiving the first electric signal and the second electric signal, obtain the time delay τ corresponding to secondorder correlation function peak value
1, when semi-transparent semi-reflecting lens (8) receives the part reflected light that the second beam splitter (7) reflects, transmissive portions light splitting is simultaneously to be measured catoptron (9), transmissive portions light splitting is reflexed to semi-transparent semi-reflecting lens (8) and the second beam splitter (7) by be measured catoptron (9), first detector (10) receives the light after transmission and produces the 3rd electric signal, and deliver to coincidence measurement logic computer (12), coincidence measurement logic computer (12) calculates the secondorder correlation function that the first electric signal and the 3rd electric signal are normalized, obtain the time delay τ corresponding to secondorder correlation function peak value
2, and calculate the distance between to be measured reflective mirror (9) to semi-transparent semi-reflecting lens (8)
wherein, Δ τ=τ
2-τ
1.
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| CN201510134725.4A CN104729458B (en) | 2015-03-25 | 2015-03-25 | A kind of novel measuring distance meter based on hot light field bunching effect |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597467A (en) * | 2016-11-22 | 2017-04-26 | 北京航天控制仪器研究所 | HOM interference principle-based range finder |
| CN106646643A (en) * | 2016-11-22 | 2017-05-10 | 北京航天控制仪器研究所 | Gravimeter based on thermal optical field bunching effects |
| CN109901182A (en) * | 2019-02-18 | 2019-06-18 | 杭州电子科技大学 | A kind of laser ranging system and method based on second order intensity correlation function |
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| JPH09133525A (en) * | 1995-11-10 | 1997-05-20 | Nippon Soken Inc | Distance measuring device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597467A (en) * | 2016-11-22 | 2017-04-26 | 北京航天控制仪器研究所 | HOM interference principle-based range finder |
| CN106646643A (en) * | 2016-11-22 | 2017-05-10 | 北京航天控制仪器研究所 | Gravimeter based on thermal optical field bunching effects |
| 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 |
| 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 |
| CN109901182A (en) * | 2019-02-18 | 2019-06-18 | 杭州电子科技大学 | A kind of laser ranging system and method based on second order intensity correlation function |
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| CN104729458B (en) | 2017-04-05 |
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