CN105911534A - Optical filtering device with transmittance changing along with receiving visual field angle - Google Patents
Optical filtering device with transmittance changing along with receiving visual field angle Download PDFInfo
- Publication number
- CN105911534A CN105911534A CN201610223507.2A CN201610223507A CN105911534A CN 105911534 A CN105911534 A CN 105911534A CN 201610223507 A CN201610223507 A CN 201610223507A CN 105911534 A CN105911534 A CN 105911534A
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- Prior art keywords
- insulation cover
- light
- visual field
- field
- lens
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0147—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on thermo-optic effects
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optics & Photonics (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
An optical filtering device with transmittance changing along with a receiving visual field angle comprises the components of a receiving main lens, a visual field diaphragm, a collimating lens, front window glass of a heat insulation cover, an interference filter, back window glass of the heat insulation cover, and a focusing lens, wherein the visual field diaphragm, the collimating lens, the front glass cover of the heat insulation cover, the interference filter, the back window glass of the heat insulation cover and the focusing lens are successively arranged along the optical axis of the receiving main lens in a laser echo direction. The visual field diaphragm is arranged in the focal plane of the receiving main lens. A semiconductor refrigerator and a thermistor are mounted on the heat insulation cover. The planes of the front glass window, the interference filter and the back window glass are parallel with one another. The optical filtering device has advantages of matching the central wavelength of light which enters the interference filter in a certain angle with receiving light, realizing attenuation of light received by a central small visual field based on a large visual field transmittance at the edge, and effectively improving dynamic detecting range of a laser radar system in strong scattering medium of water, fog, etc.
Description
Technical field
The present invention relates to optically filtering, the optical filtering apparatus that a kind of transmitance changes with field of view of receiver angle, this device exists
On the basis of ensureing big visual field, edge transmitance, it is achieved center small field of view is received the decay of light, laser radar can be effectively improved
The dynamic range that system detects in the strong scattering medium such as water, mist.
Background technology
Laser radar carries out target acquisition in the strong scattering medium such as water, mist, the strong decay caused due to strong scattering medium, target
The range attenuation of echo-signal is more serious than the decay in normal atmospheric the most much, therefore, and can dynamic to the detection of laser radar
Scope proposes higher requirement.The most conventional improving laser radar detects the mode of dynamic range in strong scattering medium mainly to be had
Fixed proportion subchannel technology, logarithmic amplification technology, polarization technology, gate and synchronize variable-gain technology.
Fixed proportion subchannel technology is to install the light splitting piece of fixed proportion on receiving light path, and the passage that light splitting is few is used for closely
Strong echo-signal is measured, it is achieved the optical attenuation to closely strong echo-signal, and the many passage of light splitting is for remote weak echo signal
Measure, it is ensured that the light transmission rate to remote weak echo signal.This technology is simple, ripe, although can expanded laser light radar
Dynamic range, but the many passage of light splitting still can receive closely strong echo-signal and cause saturated, impact should to a certain extent
Channel detector is to the detectivity of remote weak echo signal and stability.
Logarithmic amplification technology be in detection circuit use logafier to realize the dynamic range compression of the signal of telecommunication, this technology energy
The dynamic range of enough effective expanded laser light radar system rear ends Acquisition Circuit, but, it is impossible to solve closely strong echo-signal and cause
Detector saturation problem.
Polarization technology is that the dynamic range using the echo interference of optical polarization method of reseptance suppression strong scattering medium to cause increases, no
The laser radar dynamic range to hard goal detection in strong scattering medium can be improved.
Gating technology can make laser radar only return a certain segment distance in certain one-shot measurement by optics or electrical method
Ripple signal carries out accordingly, is then the most repeatedly detected different distance by adjustment parameter, it is achieved to detection dynamic range
Extension.But, this technology needs laser radar repeatedly to detect the time continuity meeting echo-signal, is not suitable for spy
The quick detection application that the survey time requires.
Synchronizing variable-gain technology is by detector gain and laser emission time opening relationships, using Laser emission as initial time,
Passage quickly improves the gain of detector over time, it is achieved the change of sensitivity to different distance sounding.This technology is
It is widely used in range finding and Atmospheric Survey laser radar, but in strong scattering medium, the rise time of variable-gain curve is often
Within foreshortening to for hundred nanoseconds, detector and circuit can be brought higher noise by change in gain so at a high speed, affect signal defeated
The stability gone out.Therefore, for the current laser radar used in strong scattering medium, the dynamic range of detection remains one
Need the key issue solving and optimizing.
Summary of the invention
The invention aims to solve detection dynamic range that laser radar faces when detecting the strong scattering medium such as water, mist not
Foot problem, it is provided that the optical filtering apparatus that a kind of transmitance changes with field of view of receiver angle, this device utilizes cardiac wave in interferometric filter
The characteristic of personal attendant's angle of light degree change, on the basis of ensureing big visual field, edge echo light relatively high permeability, it is achieved little to center
The decay of visual field echo light, can be effectively improved laser radar system detection dynamic range in the strong scattering medium such as water, mist.
The operation principle of the present invention:
Laser is propagated in strong scattering medium, and the spot diameter of laser can increase rapidly with propagation distance, in shorter distance
Forming bigger visual field change and scattered signal Strength Changes, its scattered light echo-signal formed has a characteristic that
1, closely locating, optical echo signal concentrates on center small field of view；
2, distant location, the big visual field of optical echo signals disperse to edge；
3, remote optical echo signal intensity to be far smaller than in-plant optical echo signal intensity.
Ultimate principle is the characteristic that the centre wavelength of interferometric filter changes with incident angle of light: λθ=λ0[1-(Ne/N)2sin2θ]0 . 5,
Wherein, λ0Being centre wavelength during light 0 angle incidence, Ne is external agency refractive index, and N is optical filter refractive index, θ
It is angle of incidence of light, λθIt is centre wavelength during light θ angle incidence.The relaying collimated light path that optics receives lens installs one
The temperature controlled bandpass interference filter of individual band, the centre wavelength of interferometric filter can vary with temperature, by interfering filter to band is logical
Mating plate temperature control, filter center wavelength during big for light edge angle of visual field incidence is set to receive light wavelength.When
Receiving light from edge during the entrance of the big angle of visual field, the centre wavelength of interferometric filter is consistent with receiving optical wavelength, optically filtering now
Device transmitance is the highest.When receiving small field of view angle, Guang Cong center and entering, the centre wavelength of interferometric filter is inclined with reception optical wavelength
From maximum, optical filtering apparatus transmitance now is minimum.The transmitance of this optical filtering apparatus can be with the increase at field of view of receiver angle
And increase, therefore, this device is on the premise of ensureing big visual field, remote edge weak signal transmitance, it is possible to achieve to closely
The suppression of field intensity echo-signal is neglected at center, promotes the dynamic range of echo optical receiving system.
The technical solution of the present invention is as follows:
The optical filtering apparatus that a kind of transmitance changes with field of view of receiver angle, its feature is: this device includes receiving main lens,
It is field stop, collimating lens, the front window glass of thermal insulation cover successively along this reception main lens optical axis and return laser beam direction, does
Relating to optical filter, the rear hatch glass of thermal insulation cover and condenser lens, described field stop is positioned at described reception main lens focal plane,
Semiconductor cooler and critesistor are arranged on described thermal insulation cover, described front window glass, interferometric filter (and rear window
The plane of mouth glass is parallel；
Return laser beam is converged in described field stop by the described main lens that receives, and described field stop only regards through reception
Light in Chang, the light passed through after described collimating lens collimation through described interferometric filter, through interferometric filter
Light is focused on follow-up detector by described condenser lens.
Under preset temperature, the centre wavelength of the described interferometric filter corresponding edge angle of visual field and the light wave receiving main lens reception
Long consistent.
Described front window glass and rear hatch glass are coated with and receive the anti-reflection deielectric-coating that main lens receives the consistent wavelength of light.
The outer surface of described thermal insulation cover is close in one end of described semiconductor cooler, and the other end is installed on a heat sink, described
Semiconductor cooler according to the measurement temperature of critesistor and the difference of preset temperature thermal insulation cover heated or freeze, will insulation
The internal temperature control of cover is in preset temperature ± 1 DEG C scope.
It is an advantage of the current invention that:
1, the feature that laser transmits in strong scattering medium is utilized, the optically filtering that transmitance of the present invention changes with field of view of receiver angle
Device, without increasing detection channels, can effectively suppress the strong echo-signal near field, and keep the integrity of signal；
2, for the scattering medium of different scattering strengths, can adjust dry by the on-line control to interferometric filter temperature
Relate to the centre wavelength of optical filter, thus change the transmitance change curve with the angle of visual field, i.e. change the transmitance ratio of far and near field signal
Value, better adapts to ambient parameter.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the optical filtering apparatus that transmitance of the present invention changes with field of view of receiver angle；
In figure: 1 receives main lens, 2 field stops, 3 collimating lens, 4 interferometric filters, 5 thermal insulation covers, 5-1
Thermal insulation cover front screen, 5-2 thermal insulation cover rear window, 6 semiconductor coolers, 6-1 semiconductor cooler for heat dissipation sheet,
7 critesistor, 8 condenser lenses.
Detailed description of the invention
Below in conjunction with example and accompanying drawing, the invention will be further described, but should not limit the scope of the invention with this.
First refer to the structured flowchart that Fig. 1, Fig. 1 are the optical filtering apparatus that transmitance of the present invention changes with field of view of receiver angle, by
Scheme visible, transmitance of the present invention with the optical filtering apparatus that field of view of receiver angle changes include receive main lens 1, field stop 2,
Collimating lens 3, interferometric filter 4, thermal insulation cover 5, thermal insulation cover front screen 5-1, thermal insulation cover rear window 5-2, quasiconductor
Refrigerator 6, semiconductor cooler for heat dissipation sheet 6-1, critesistor 7, condenser lens 8, the annexation of above-mentioned component is as follows:
Laser echo in strong scattering medium is converged in described field stop 2 by the described main lens 1 that receives, described
Field stop 2 through the light in field of view of receiver, the light passed through after described collimating lens 3 collimation through described interference
Optical filter 4, the light through interferometric filter is focused on follow-up detector, described interference filter by described condenser lens 8
Sheet 4 is arranged in described thermal insulation cover 5, and described semiconductor cooler 6 and critesistor 7 are arranged on described thermal insulation cover,
Realize the temperature to thermal insulation cover to control.
Main devices and parameter that an embodiment use be presented herein below:
Described reception main lens 1 is non-spherical lens, clear aperture 200mm, numerical aperture 0.4, wavelength 526.5nm's
Transmitance is 99.9%；
Described field stop 2 is one and is arranged on the circular hole diaphragm received on main lens 1 focal plane, and aperture is 10mm, with
Described reception main lens 1 light shaft coaxle；
Described collimating lens 3 and condenser lens 8 are non-spherical lens, clear aperture 60mm, numerical aperture 0.4, wavelength
The transmitance of 526.5nm is 99.9%；
The preset temperature of described interferometric filter 4 20 DEG C, the centre wavelength at its corresponding 20mrad angle is 526.5nm, corresponding
The centre wavelength at 0mrad angle is 526.9nm.The optical bandwidth of interferometric filter is 0.6nm, and it is incident for 20mrad angle
The transmitance of 526.5nm light be 0.7, and the transmitance for the incident 526.5nm light of 0mrad angle is only 0.002.
Described thermal insulation cover 5 includes front screen 5-1 and rear window 5-2, two glass pane planes and interferometric filter 4
Plane is parallel, and before and after laying respectively at interferometric filter, and glass pane is coated with the anti-reflection deielectric-coating of 526.5nm, and transmitance is 99.9%.
Described critesistor 7 is arranged on inside thermal insulation cover, for measuring the temperature within thermal insulation cover.
The outer surface of thermal insulation cover is close in described semiconductor cooler 6 one end, and the other end is arranged on semiconductor cooler for heat dissipation sheet
On 6-1, according to the difference of critesistor 7 feedback temperature and 20 DEG C of preset temperatures thermal insulation cover heated or freeze, will be incubated
The internal temperature control of cover is 20 DEG C ± 1 DEG C scope.
Claims (4)
1. the optical filtering apparatus that transmitance changes with field of view of receiver angle, its feature is: this device includes receiving master thoroughly
Mirror (1), along this reception main lens (1) optical axis and return laser beam direction be successively field stop (2), collimating lens (3),
The front window glass (5-1) of thermal insulation cover (5), interferometric filter (4), the rear hatch glass (5-2) of thermal insulation cover (5) and
Condenser lens (8), described field stop (2) is positioned at described reception main lens (1) focal plane, semiconductor cooler (6)
It is arranged on described thermal insulation cover (5) with critesistor (7), described front window glass (5-1), interferometric filter (4)
It is parallel to each other with the plane of rear hatch glass (5-2)；
Return laser beam is converged to (2) in described field stop, described field stop (2) by described reception main lens (1)
Only through the light in field of view of receiver, the light passed through after described collimating lens (3) collimation through described interferometric filter
(4), the light through interferometric filter is focused on follow-up detector by described condenser lens (8).
The optical filtering apparatus that transmitance the most according to claim 1 changes with field of view of receiver angle, it is characterised in that in advance
At a temperature of if, the light that the centre wavelength of described interferometric filter (4) the corresponding edge angle of visual field receives with reception main lens (1)
Consistent wavelength.
The optical filtering apparatus that transmitance the most according to claim 1 changes with field of view of receiver angle, it is characterised in that described
Front window glass (5-1) and rear hatch glass (5-2) be coated with and receive main lens (1) and receive the increasing of consistent wavelength of light
Deielectric-coating thoroughly.
4. the optical filtering apparatus changed with field of view of receiver angle according to the transmitance described in any one of claims 1 to 3, it is special
Levying the outer surface being that described thermal insulation cover is close in one end of described semiconductor cooler (6), the other end is fin (6-1
On, thermal insulation cover is carried out with the difference of preset temperature by described semiconductor cooler (6) according to the measurement temperature of critesistor (7)
Heating or refrigeration, the temperature making described thermal insulation cover (5) internal controls in preset temperature ± 1 DEG C scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610223507.2A CN105911534B (en) | 2016-04-12 | 2016-04-12 | The optical filtering apparatus that transmitance changes with field of view of receiver angle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610223507.2A CN105911534B (en) | 2016-04-12 | 2016-04-12 | The optical filtering apparatus that transmitance changes with field of view of receiver angle |
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| CN105911534A true CN105911534A (en) | 2016-08-31 |
| CN105911534B CN105911534B (en) | 2018-11-20 |
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| CN110412594A (en) * | 2019-07-22 | 2019-11-05 | 北京光勺科技有限公司 | A kind of laser multi-channel detection system |
| CN110441754A (en) * | 2019-07-22 | 2019-11-12 | 中国科学院上海光学精密机械研究所 | Segment the controllable optical receiver assembly of visual field optical efficiency |
| CN111123239A (en) * | 2019-12-20 | 2020-05-08 | 深圳市速腾聚创科技有限公司 | Receiving device, transmitting/receiving device, and laser radar |
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| CN111123239A (en) * | 2019-12-20 | 2020-05-08 | 深圳市速腾聚创科技有限公司 | Receiving device, transmitting/receiving device, and laser radar |
| CN111123239B (en) * | 2019-12-20 | 2022-08-16 | 深圳市速腾聚创科技有限公司 | Receiving device, transmitting/receiving device, and laser radar |
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| CN105911534B (en) | 2018-11-20 |
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Effective date of registration: 20211210 Address after: No. 19, Hengfei Road, Nanjing Economic and Technological Development Zone, Nanjing, Jiangsu 210046 Patentee after: NANJING INSTITUTE OF ADVANCED LASER TECHNOLOGY Address before: 201800 mail box 800-211, Shanghai, Jiading District, Shanghai Patentee before: SHANGHAI INSTITUTE OF OPTICS AND FINE MECHANICS CHINESE ACADEMY OF SCIENCES |
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