CN109709078A - Transmission-type atmospheric visibility measuring device and method based on single-photon detecting survey technology - Google Patents
Transmission-type atmospheric visibility measuring device and method based on single-photon detecting survey technology Download PDFInfo
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Abstract
The present invention relates to transmission-type atmospheric visibility measuring devices and method based on single-photon detecting survey technology.The device includes light source module, light path module, optical detection module and control module.This method is that light source acts on light path module after high-speed pulse is modulated, and for a part of incident light as reference light, a part of incident light is used as optical signal transmissive after atmospheric extinction, calculates through optical detection module and control module and obtains atmospheric visibility.The present invention can carry out high-precision measurement to optical signal, realize the precise measurement of atmospheric visibility in wide-range.Meanwhile reference light, transmitted light and environment stray light are distinguished by the flight time of optical signal, improve system rejection to disturbance ability and measurement accuracy.In addition, reducing the complexity of optical path debugging present invention employs optical path self-correcting structure, reducing place installation requirement, increase practicability.Present invention can apply to the industries such as weather station, airport, highway, harbour and atmosphere environment supervision.
Description
Technical field
The present invention relates to atmospheric visibility field of measuring technique, and in particular to a kind of transmission based on single-photon detecting survey technology
Formula atmospheric visibility measuring device and method.
Background technique
Atmospheric visibility is important one of meteorologic parameter, it reflects the transparency of atmosphere.In recent years, due to air
Seriously polluted, there is the of short duration heavy haze weather of part in many areas, cause visibility of air extremely low, to land transportation, boat
The public transport such as fortune, sea-freight and people's health produce important influence.Therefore, the real-time quantitative measurement of atmospheric visibility
Have great importance.
Currently, the measurement of atmospheric visibility is broadly divided into visually measurement and apparatus measures two major classes.Wherein, visual observation is
Refer to artificial observation, visual observation result can differ greatly because of observation condition Different Results, such as observation point height, observation scope and
The eyesight of observer and training and psychological condition etc..In common measuring instrument, it is fixed that transmission-type visibility meter is best suitable for visibility
Justice is a kind of optimal visibility measurement device.However, existing transmission-type visibility meter is in high-visibility measurement accuracy
On, it is limited by baseline length.It is calculated by measure theory, under the baseline of 80 meters of length, if visibility is 10 kilometers
In the case where, it is desirable that within 10%, the measurement accuracy of transmitance must reach within 3 ‰ the error of visibility measurement value, this
To for a long time outfield operation measuring system for required precision it is excessively high, the cost of realization is excessively high.Meanwhile baseline is not measured also not
Can be too long, this is because transmitance is too low under lower visibility conditions, transmitted light source signal is very faint, also influences whether to survey
Dose-effect fruit.
Summary of the invention
The transmission-type atmospheric visibility measuring device based on single-photon detecting survey technology that the purpose of the present invention is to provide a kind of
And method, the measuring device and method can make up for it the deficiency of existing transmission-type atmospheric visibility measuring technique, solve range model
Enclose the problems such as narrow and place installation requirement is high.
To achieve the above object, the invention adopts the following technical scheme:
A kind of transmission-type atmospheric visibility measuring device based on single-photon detecting survey technology, including light source module, optical path mould
Block, optical detection module and control module.
Specifically, the light source module includes the oscillator, light source drive and light source being sequentially connected.
The light path module includes the collimation lens, spectroscope and corner reflector being successively set in light source output optical path,
It is successively set on total reflective mirror on corner reflector reflected light path, the first condenser lens, the first optical filter, the first diaphragm, second poly-
Focus lens, the second optical filter and the second diaphragm, the tertiary focusing lens being successively set on total reflective mirror reflected light path, third filter
Piece and third diaphragm and the first protective glass and the second protective glass.
The optical detection module includes the first photodetector, the second photodetector and single-photon detector；Described
The exit end of input the first diaphragm of termination of one photodetector；Input the second diaphragm of termination of second photodetector
Exit end；The exit end of the input termination third diaphragm of the single-photon detector.
The control module includes controller, display module and memory module；The input terminal of the controller is respectively with
The output of the output end of one photodetector, the output end of the second photodetector, the output end of single-photon detector, oscillator
End is connected；The output end of controller respectively with the input terminal of single-photon detector, the input terminal of display module and memory module
Input terminal is connected.
Further, which further includes corner reflector attitude-adjusting system, the corner reflector attitude-adjusting system,
Input terminal is connected with the output end of controller, and output end is connected with corner reflector.
Further, the light source uses laser diode, and the wavelength of light source is 850nm.The light source drive can produce
Raw high-speed pulse uses APC control circuit, the output power of stabilized light source for driving light source.
Further, spectroscopical splitting ratio (reflecting: transmission) is less than 0.1.
Further, two circular holes set gradually from up to down are offered on the total reflective mirror.
Further, the single-photon detector works under Geiger mode angular position digitizer, the detectivity with single photon.It is described
First photodetector and the second photodetector are all made of PIN photoelectric detector.
Further, first protective glass and the second protective glass are all made of flat glass piece, and the flat glass piece
Outer surface be coated with infrared anti-reflection film and hydrophobic film.
The invention further relates to a kind of measurement methods of above-mentioned transmission-type atmospheric visibility measuring device, and this method includes following
Step:
(1) oscillator output signal acts on light source drive, generates high-speed pulse signal；High-speed pulse signal function
In light source, high-speed pulse modulation light is generated.
(2) high-speed pulse modulation light is after collimation lens and spectroscope, and a part of light is incident on corner reflector, by angle
After reflecting mirror, total reflective mirror reflection, by tertiary focusing lens, third optical filter and third diaphragm as transmitted light by single-photon detecting
It surveys device to receive, another part light is used as ginseng by tertiary focusing lens, third optical filter and third diaphragm through after total reflective mirror
Light beam is examined to be received by single-photon detector.
(3) when the first photodetector detects optical signal, controller controls the driving of corner reflector attitude-adjusting system
Corner reflector is moved along X forward direction, to correct optical path；When the second photodetector detects optical signal, controller pilot angle is anti-
It penetrates mirror attitude-adjusting system driving corner reflector to move along X negative sense, to correct optical path.
(4) when the first photodetector and the second photodetector do not detect optical signal: controller starts to receive
Oscillator output signal is as reference clock, delay time t1It is opened single-photon detector t seconds after second；Single-photon detector receives
Reference beam simultaneously generates corresponding electric impulse signal, delay time t2It is opened single-photon detector t seconds after second；Single-photon detector
It receives transmitted light beam and generates corresponding electric impulse signal, delay time t3It is opened single-photon detector t seconds after second；Single-photon detecting
Device is surveyed to receive environment light and generate corresponding electric impulse signal；Counter inside controller is respectively completed to reference light, transmission
The electric impulse signal of light and environment light counts, and count value respectively corresponds as N0、NrWith Nn, realize the light intensity of optical signal to photon meter
The conversion of numerical value.
(5) repeat the above steps (1)~(4), and controller completes the measurement in several periods, using formulaAtmospheric visibility value MOR is calculated, and calculated result is stored in storage mould
Block, while showing on the display module；Wherein, L is baseline length, and k is the system constants of device, N0、Nr、NnRespectively refer to
The electric impulse signal count value of light, transmitted light and environment light.
Further, in step (4), the delay time t1、t2、t3Second using oscillator output signal as reference clock, leads to
Cross and calculate reference beam, the light flight time of transmitted light beam sets, to distinguish reference light, transmitted light and environment light, wherein
t1<t2<t3, t < t2-t1And t < t3-t2, t1For the sum of signal delay time and reference beam flight time, t2Fly for transmitted light beam
The row time.
Compared to the prior art, the invention has the benefit that
(1) present invention uses single-photon detecting survey technology, and the high sensitivity, high-precision, the wide line model of optical signal may be implemented
Measurement is enclosed, existing transmission-type visibility meter can be made up in high-visibility measurement accuracy, limited not by baseline length
Foot.
(2) present invention use total reflective mirror, and using the same single-photon detector simultaneously receive reference light, transmitted light and
Environment stray light, the light flight time by calculating optical signal distinguish reference light, transmitted light and environment stray light, improve system
Anti-interference ability and measurement accuracy.
(3) present invention employs optical path self-correcting structures, reduce the complexity of optical path debugging, reduce place installation
It is required that increasing practicability.
(4) present invention uses the biradical line measurement method of corner reflector, increases the baseline length of measurement, improves transmission
Method measurement accuracy, simultaneously as the reflection characteristic of corner reflector, avoids optical path adjustment complicated when installation；It is set in structure
On meter, light source transmitting terminal and two signal receiving ends can be designed to an entirety, convenient for simplifying the reality of structure and measuring circuit
It is existing.
(5) present invention employs the first protective glasses and the second protective glass two panels protective glass, it is ensured that other light in light path module
Device is learned from pollution, while the 850nm infrared anti-reflection film that the outer surface of the sheet glass of protective glass is plated improves 850nm light
Transmitance, the hydrophobic film plated reduce protective glass surface because rain or air in condensation vapor there is droplet or water film can
Energy.
Detailed description of the invention
Fig. 1 is the structural block diagram of the transmission-type atmospheric visibility measuring device in the present invention based on Detection Techniques；
Fig. 2 is the method flow diagram of measurement method in the present invention；
Fig. 3 is measurement result statistics schematic diagram of the present invention；
Fig. 4 is signal sequence schematic diagram of the invention；
Fig. 5 is corner reflector structural schematic diagram in the present invention.
Wherein:
1, light source module, 11, oscillator, 12, light source drive, 13, light source, 2, light path module, 21, collimation lens, 22,
Spectroscope, 23a, corner reflector, 23b, corner reflector attitude-adjusting system, 24, total reflective mirror, 25a, the first condenser lens, 25b,
Second condenser lens, 25c, tertiary focusing lens, 26a, the first optical filter, 26b, the second optical filter, 26c, third optical filter,
27a, the first diaphragm, 27b, the second diaphragm, 27c, third diaphragm, 27d, total reflective mirror reflected light path, 28a, light source output optical path,
28b, reference beam, 28c, corner reflector reflected light path, 29a, the first protective glass, 29b, the second protective glass, 3, optical detection module,
31, single-photon detector, the 32, first photodetector, the 33, second photodetector, 4, control module, 41, controller, 42,
Display module, 43, memory module.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing:
A kind of transmission-type atmospheric visibility measuring device based on single-photon detecting survey technology as shown in Figure 1, including light source
Module 1, light path module 2, optical detection module 3 and control module 4.
Specifically, the light source module 1, including sequentially connected oscillator 11, light source drive 12 and light source 13.
The light path module 2 includes 22 He of collimation lens 21 and spectroscope being successively set on light source output optical path 28a
Corner reflector 23a, total reflective mirror 24, the first condenser lens 25a, first being successively set on corner reflector 23a reflected light path 28c
Optical filter 26a, the first diaphragm 27a, the second condenser lens 25b, the second optical filter 26b and the second diaphragm 27b are successively set on complete
Tertiary focusing lens 25c, third optical filter 26c and third diaphragm 27c and the first protective glass on anti-24 reflected light path 27d of mirror
29a and the second protective glass 29b.The device further includes corner reflector attitude-adjusting system 23b, for the position of corner reflector into
Row adjustment, it is ensured that the accuracy of optical path.In order to cooperate corner reflector attitude-adjusting system to use, the present invention opens on total reflective mirror 24
If two two circular holes set gradually from up to down, for monitoring the displacement of corner reflector 23a in X direction, if two circles
Hole is respectively upper hole and lower opening.Due to the light emitting end and light reflection end of transmission-type atmosphere visibility meter be located at it is one longer
On two pieces of grounds of distance.When working long hours, the factors such as temperature and humidity, vibration will affect ground in environment so that reflection end with
The micro inclination of reflection end causes reflected light to offset out the light receiving area of single-photon detector to influence precisely aligning for optical path
Domain leads to measurement error.Therefore, the present invention using two PIN photoelectric detectors, (visit by the first photodetector 32, the second photoelectricity
Survey device 33) and corresponding condenser lens, optical filter and diaphragm, it collects and is worn since optical path is deviated from about 24 two circular holes of total reflective mirror
The reflected light crossed, and on this basis, utilize the position of corner reflector attitude-adjusting system 23b adjustment corner reflector 23a.Specifically
Ground, after the first photodetector 32 receives reflected light signal by hole on total reflective mirror, corner reflector attitude-adjusting system 23b
Drive corner reflector 23a mobile to X-axis forward direction；When the second photodetector 33 receives reflected light signal by total reflective mirror lower opening
Afterwards, corner reflector attitude-adjusting system 23b drives corner reflector 23a mobile to X-axis negative sense.Alternatively, it is also possible to not in total reflective mirror
Circular hole is opened up on 24, but uses the lesser total reflective mirror of a block size, in this way when corner reflector 23a position inaccuracy, light meeting
Without total reflective mirror 24, but go over from the upside of total reflective mirror 24 or downside, is detected by first or second photodetector.
The optical detection module 3 includes the first photodetector 32, the second photodetector 33 and single-photon detector
31, the input terminal of the first photodetector 32 connects the exit end of the first diaphragm 27a, and the output end of the first photodetector 32 connects
Controller 41 is connect, the input terminal of the second photodetector 33 connects the exit end of the second diaphragm 27b, the second photodetector 33
Output end connects controller 41, the exit end of the input terminal connection third diaphragm 27c of single-photon detector 31, single-photon detector
31 output end connects controller 41.
The control module 4 includes controller 41, display module 42 and memory module 43, and the input terminal of controller 41 connects
First photodetector 32, the second photodetector 33, single-photon detector 31 and oscillator 11 output end, controller 41
Output end connection single-photon detector 31, display module 42, memory module 43 and corner reflector attitude-adjusting system 23b it is defeated
Enter end.
In the present embodiment, it is that the square-wave signal that 1MHz duty ratio is 50% acts on light source driving that oscillator 11, which generates frequency,
Device；Light source drive 12 generate frequency be 1MHz, the high-speed pulse signal that pulse width is 200ns, act on light source 13, simultaneously
Using APC control circuit, the output power of stabilized light source 13.Light source 13 uses the laser diode of 850nm.Spectroscope 22 uses
The BP108 type pellicular beamsplitters of Thorlabs company, splitting ratio 8:92.First optical filter 26a, the second optical filter 26b, third
Optical filter 26c uses central wavelength for the with pass filter piece of 850nm, and bandwidth is ± 10nm, transmitance > 90%.First diaphragm
27a, the second diaphragm 27b, third diaphragm 27c the aperture of the diaphragm be 2mm.First protective glass 29a and the second protective glass 29b is using tool
There is the flat glass piece of high transmittance, uses coating process in the outer surface of sheet glass, plate 850nm infrared anti-reflection film and hate
Moisture film.Single-photon detector is powered, in 850nm feux rouges using the SPCM-AQRH-15 of PerkinElmer company for 5V
The detection efficient at place is 50%, and dark counting is 50 per second, dead time 20ns, and maximum saturation count value is 40M/S, exports 8ns
The digital pulse signal of wide TTL compatible.Controller 41 uses the EP2C8Q208N core of altera corp Cyclone II series
Piece realizes control, the processing of signal and the operation of data of whole device by programming.First photodetector 32, second
Photodetector 33 uses PIN photoelectric detector, there is higher sensitivity in the frequency range of light source.Corner reflector pose adjustment machine
Structure 23b uses the LNR25ZFS type stepper motor displacement platform of Thorlabs company, range 25mm, and maximum displacement is
0.46nm, maximum speed 2mm/s.
The transmission-type atmospheric visibility measurement method based on single-photon detecting survey technology that the invention further relates to a kind of, such as Fig. 2 institute
Show, method includes the following steps:
(1) 11 output frequency of oscillator is the square-wave signal that 1MHz duty ratio is 50%, acts on light source drive 12, is produced
The high-speed pulse signal function that raw frequency is 1MHz, pulse width is 200ns generates high-speed pulse modulation light in light source 13.
(2) high-speed pulse modulation light is after the spectroscope 22 that collimation lens 21 and splitting ratio are 8:92, a part of light 28a
It is incident on corner reflector 23a, after being reflected by corner reflector 23a, total reflective mirror 24, filters by tertiary focusing lens 25c, third
Piece 26c and third diaphragm 27c is received as transmitted light by single-photon detector 31, and another part light passes through through total reflective mirror 24
Tertiary focusing lens 25c, third optical filter 26c and third diaphragm 27c are connect as reference beam 28b by single-photon detector 31
It receives.
(3) when the first photodetector 32 or the second photodetector 33 detect optical signal, controller 41 drives angle
Reflecting mirror attitude-adjusting system 23b driving corner reflector moves along the x-axis, to correct optical path.Specifically, the first photodetector
32 receive and act on controller 41 after optical signal, and controller 41 controls corner reflector attitude-adjusting system 23b and drives corner reflection
Mirror 23a is moved along X forward direction, to correct optical path.Second photodetector 33 acts on controller 41 after receiving optical signal.It is described
Controller 41 controls corner reflector attitude-adjusting system 23b driving corner reflector 23a and moves along X negative sense, to correct optical path.
(4) if the first photodetector 32 and the second photodetector 33 do not detect optical signal, controller 41 is opened
11 output signal of beginning reception oscillator is as reference clock, delay time t1It is opened single-photon detector 31t seconds after second, single photon
Detector 31 receives reference beam 28b and generates corresponding electric impulse signal, delay time t2Single-photon detector is opened after second
31t seconds, single-photon detector 31 received transmitted light beam 28d and generates corresponding electric impulse signal, delay time t3It is opened after second
Single-photon detector 31t seconds, single-photon detector 31 received environment light and generates corresponding electric impulse signal；Inside controller 41
Counter be respectively completed to the counting of the electric impulse signal of the reference light, transmitted light and environment light, count value respectively correspond for
N0、NrWith Nn, realize the light intensity of optical signal to the conversion of photon count value, as shown in Figure 3.
(5) repeat the above steps (1)~(4), and controller 41 completes the measurement in several periods, calculates atmospheric visibility value
MOR, calculation formula are as follows:Wherein L is baseline length, and k is the system of device
Constant.And calculated result is stored in memory module 42, it is shown on display module 43.
Further, in step (4), the delay time t1、t2、t3Second is using 11 output signal of oscillator as reference clock.
As shown in figure 4, being set by the light flight time for calculating reference beam 28b, transmitted light beam 28d, to distinguish reference light, transmission
Light and environment light, wherein t1<t2<t3, t < t2-t1And t < t3-t2, t1For signal delay time and reference beam 28b flight time
The sum of, t2For the transmitted light beam 28d flight time.In the present embodiment, baseline length L is 100 meters, t1Take 4ns, t2Take 335ns, t3
500ns, t is taken to take 250ns.
As shown in figure 5, corner reflector 23a regards the total reflective mirror being disposed vertically by two sides as in the present embodiment, when there is directional light
When being incident on 23a, returned after light multiple reflections by former direction, reflection light 28c is parallel with incident ray 28a；Work as corner reflection
When device 23a has rotated a small angle theta around point A due to installation error etc., the position of corner reflector 23a becomes such as corner reflection
Device 23a ' is shown, according to the property of corner reflector, when 28a is incident on 23a ', returns after light multiple reflections by former direction, instead
It is parallel with incident ray 28a to penetrate light 28c ', and reflection light 28c is overlapped with 28c ', light path is also identical.Such structure specific surface
The mirror structure of shape is more stable, and optical path more easily adjusts.
In conclusion the present invention can carry out high-precision measurement to optical signal, atmospheric visibility in wide-range is realized
Precise measurement.Meanwhile reference light, transmitted light and environment stray light are distinguished by the flight time of optical signal, it is anti-to improve system
Interference performance and measurement accuracy.In addition, the complexity of optical path debugging is reduced present invention employs optical path self-correcting structure,
Place installation requirement is reduced, practicability is increased.Present invention can apply to weather station, airport, highway, harbour with
And the industries such as atmosphere environment supervision.
Embodiment described above only describe the preferred embodiments of the invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made should all be fallen into the protection scope that claims of the present invention determines.
Claims (9)
1. the transmission-type atmospheric visibility measuring device based on single-photon detecting survey technology, it is characterised in that: including light source module, light
Road module, optical detection module and control module；
The light source module includes the oscillator, light source drive and light source being sequentially connected；
The light path module includes the collimation lens, spectroscope and corner reflector being successively set in light source output optical path, successively
Be arranged in total reflective mirror on corner reflector reflected light path, the first condenser lens, the first optical filter, the first diaphragm, second focus it is saturating
Mirror, the second optical filter and the second diaphragm, be successively set on tertiary focusing lens on total reflective mirror reflected light path, third optical filter and
Third diaphragm and the first protective glass and the second protective glass；
The optical detection module includes the first photodetector, the second photodetector and single-photon detector；First light
The exit end of input the first diaphragm of termination of electric explorer；The outgoing of input the second diaphragm of termination of second photodetector
End；The exit end of the input termination third diaphragm of the single-photon detector；
The control module includes controller, display module and memory module；The input terminal of the controller respectively with the first light
The output end phase of the output end of electric explorer, the output end of the second photodetector, the output end of single-photon detector, oscillator
Even；The input with the input terminal of single-photon detector, the input terminal of display module and memory module respectively of the output end of controller
End is connected.
2. the transmission-type atmospheric visibility measuring device according to claim 1 based on single-photon detecting survey technology, feature
Be: the device further includes corner reflector attitude-adjusting system, the corner reflector attitude-adjusting system, input terminal and control
The output end of device is connected, and output end is connected with corner reflector.
3. the transmission-type atmospheric visibility measuring device according to claim 1 based on single-photon detecting survey technology, feature
Be: the light source uses laser diode, and the wavelength of light source is 850nm.
4. the transmission-type atmospheric visibility measuring device according to claim 1 based on single-photon detecting survey technology, feature
Be: spectroscopical splitting ratio is less than 0.1.
5. the transmission-type atmospheric visibility measuring device according to claim 1 based on single-photon detecting survey technology, feature
It is: offers two circular holes set gradually from up to down on the total reflective mirror.
6. the transmission-type atmospheric visibility measuring device according to claim 1 based on single-photon detecting survey technology, feature
Be: first photodetector and the second photodetector are all made of PIN photoelectric detector.
7. the transmission-type atmospheric visibility measuring device according to claim 1 based on single-photon detecting survey technology, feature
Be: first protective glass and the second protective glass are all made of flat glass piece, and the outer surface of the flat glass piece is coated with
Infrared anti-reflection film and hydrophobic film.
8. the transmission-type atmospheric visibility measurement described in any one based on single-photon detecting survey technology according to claim 1~7
The measurement method of device, it is characterised in that: method includes the following steps:
(1) oscillator output signal acts on light source drive, generates high-speed pulse signal；High-speed pulse signal function is in light
Source generates high-speed pulse modulation light；
(2) high-speed pulse modulation light is after collimation lens and spectroscope, and a part of light is incident on corner reflector, by corner reflection
After mirror, total reflective mirror reflection, by tertiary focusing lens, third optical filter and third diaphragm as transmitted light by single-photon detector
Receive, another part light penetrate total reflective mirror after by tertiary focusing lens, third optical filter and third diaphragm as reference light
Beam is received by single-photon detector；
(3) when the first photodetector detects optical signal, it is anti-that controller controls corner reflector attitude-adjusting system driving angle
It penetrates mirror to move along X forward direction, to correct optical path；When the second photodetector detects optical signal, controller controls corner reflector
Attitude-adjusting system driving corner reflector is moved along X negative sense, to correct optical path；
(4) when the first photodetector and the second photodetector do not detect optical signal: controller starts to receive oscillation
Device output signal is as reference clock, delay time t1It is opened single-photon detector t seconds after second；Single-photon detector receives reference
Light beam simultaneously generates corresponding electric impulse signal, delay time t2It is opened single-photon detector t seconds after second；Single-photon detector receives
Transmitted light beam simultaneously generates corresponding electric impulse signal, delay time t3It is opened single-photon detector t seconds after second；Single-photon detector
It receives environment light and generates corresponding electric impulse signal；Counter inside controller be respectively completed to reference light, transmitted light with
The electric impulse signal of environment light counts, and count value respectively corresponds as N0、NrWith Nn, realize the light intensity of optical signal to photon count value
Conversion；
(5) repeat the above steps (1)~(4), and controller completes the measurement in several periods, using formulaAtmospheric visibility value MOR is calculated, and calculated result is stored in storage mould
Block, while showing on the display module；Wherein, L is baseline length, and k is the system constants of device, N0、Nr、NnRespectively refer to
The electric impulse signal count value of light, transmitted light and environment light.
9. the measurement side of the transmission-type atmospheric visibility measuring device according to claim 8 based on single-photon detecting survey technology
Method, it is characterised in that: in step (4), the delay time t1、t2、t3Second using oscillator output signal as reference clock, passes through
Calculate reference beam, the light flight time of transmitted light beam sets, to distinguish reference light, transmitted light and environment light, wherein t1<
t2<t3, t < t2-t1And t < t3-t2, t1For the sum of signal delay time and reference beam flight time, t2When for transmitted light beam flight
Between.
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| CN110793945A (en) * | 2019-10-28 | 2020-02-14 | 北京空间机电研究所 | Synthetic white light atmospheric visibility meter and visibility measuring method |
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