CN102419247A - High-precision detection device and method of reflection type optical fiber turbulence - Google Patents
High-precision detection device and method of reflection type optical fiber turbulence Download PDFInfo
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- CN102419247A CN102419247A CN2011102383226A CN201110238322A CN102419247A CN 102419247 A CN102419247 A CN 102419247A CN 2011102383226 A CN2011102383226 A CN 2011102383226A CN 201110238322 A CN201110238322 A CN 201110238322A CN 102419247 A CN102419247 A CN 102419247A
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Abstract
The invention discloses a high-precision detection device and method of reflection type optical fiber turbulence. The high-precision detection device provided by the invention comprises an adjustable laser light source, a reflection type optical fiber turbulence detection probe and a signal processing module, wherein the reflection type optical fiber turbulence detection probe is composed of a collimator, an optical circulator, an optical isolator and optical fibers; the reflection type optical fiber turbulence detection probe is only provided with one arm and an optical path difference of two bundles of light which generate the interference is an optical path where the light passes through air. According to the method provided by the invention, the small fluctuation of a local turbulence atmosphere refractive index can be directly detected through the device, so that the method and the device are applicable to a plurality of geographic environments and weather conditions. The method and the device provided by the invention have the advantages of corrosion resistance, rapid detection speed, high flexibility, small volume, easiness of integration, simplicity in operation and the like.
Description
Technical field
The present invention relates to atmospheric optics turbulence intensity field of measurement, be specially a kind of high precision reflection type optical fiber turbulent flow pick-up unit and method.
Background technology
Turbulent atmosphere is a kind of random medium heterogeneous, and its refractive index is the function of locus and time.When laser passes through turbulent atmosphere, the refractive index fluctuation that atmospheric turbulence causes will cause turbulence effects such as beam drift, expansion, light intensity flicker, phase fluctuation.These effects are restricting the application of optical engineering such as Laser Atmospheric Transmission, free space optical communication, laser ranging, photoimaging.Therefore, the optical turbulence information of accurately obtaining on the propagation path of light is most important, mainly comprises refractive index structure parameter, refractive index fluctuation variance, characteristic dimension and turbulent flow spectrum of refractive index etc.The method of measuring these parameters at present mainly contains temperature fluctuation method and optical means.
The temperature fluctuation method is that a kind of the fluctuation characteristic of its supposition air refraction depends on the fluctuation characteristic of temperature fully through measuring the indirect method of measurement that atmospheric temperature fluctuations obtains atmospheric turbulence refractive index fluctuation characteristic, and common measurement instruments is a micro-temperature sensor.The temperature fluctuation method is the method for at present the most frequently used measurement turbulent flow optical parametric, and has made many contributions for the research of atmospheric optics turbulent flow.Along with going deep into of research, this method itself intrinsic defective that becomes increasingly conspicuous, the metal platinum filament is fractureed, is polluted easily, and room and time resolution is limited, can not detect microturbulence etc.Optical means is to utilize in the turbulent atmosphere propagation effect of light to measure the turbulent flow optical parametric, and method commonly used has laser scintigraphy, arrival angle fluctuation method etc.The theoretical foundation of laser scintigraphy measurement turbulence intensity is that the Rytov under the weak fluctuation condition is approximate, and when turbulent flow was enough strong, this method lost efficacy.In addition; The somebody utilizes the lidar measurement atmospheric turbulence, and in real atmosphere, the turbulent flow isotropy and the stationarity assumed condition of the radar equation that is used to derive are difficult to be able to satisfy; The form of radar equation itself waits further perfect, and this method also is in the preliminary exploratory stage.The present turbulent flow optical parametric that records according to the optical means of turbulence effect principle all is to grow the path averaged result, and this method is difficult to obtain local refractive index fluctuation characteristic.
Owing to receive the restriction of technical conditions; Traditional optical turbulent flow measurement means is indirect or is the measurement under the hypothesis prerequisite; There is uncertainty in its result, has and reports: the turbulent parameters that records with temperature fluctuation method and optical means respectively numerically can differ more than four times.Nineteen ninety-five; Mermelstein has proposed a kind of pair of air-supported fiber Mach-Zehnder interfere measurement technique principle; Be used for directly obtaining the small fluctuating of local turbulent atmosphere refractive index; Its theoretical precision can reach
magnitude, but does not have relevant report afterwards.For the optical fiber Mach-Zehnder interferometer, two arms are arranged usually, an arm is as pickup arm, and another arm is arm as a reference.Interferometer carries the pickup arm of external information through receiving extraneous disturbance, detects external information.Atmospheric turbulence is faint, at random, if detect turbulent flow with closure arm optical fiber Mach-Zehnder interferometer, then can not well reflect the turbulent flow situation.In recent years, along with the development of photoelectric technology and phase carrier modulation-demodulation technique, occurred utilizing the method for two collimator-alignment to detect turbulent flow information.This kind method at first utilizes coupling mechanism that laser is divided into two bundles; A branch ofly be connected to collimating apparatus with optical fiber; Laser is got in the air, accepted laser as flashlight with another collimating apparatus, another restraints light as a reference; With another coupling mechanism this two bundles laser coupled is interfered, interference signal has carried the information of atmospheric effect.If the method realizes with single-mode fiber and single mode device, because the birefringence problem and the residing environment of two interferometer arm of single-mode fiber are different, make the two-beam that interferes be difficult to guarantee that polarization state is consistent, this produces certain error to the result who detects.Polarization maintaining optical fibre can solve the polarization state problem to a certain extent with the inclined to one side device of guarantor, but it is relatively more expensive to protect inclined to one side device, and it is many to make cost increase; On the other hand, protect inclined to one side collimating apparatus and increased the difficulty of aiming at.
Summary of the invention
The object of the invention provides a kind of high precision reflection type optical fiber turbulent flow pick-up unit and method, has circumscribed problem to solve prior art atmospheric optics turbulent flow detection system measurement inconvenience.
In order to achieve the above object, the technical scheme that the present invention adopted is:
High precision reflection type optical fiber turbulent flow pick-up unit; It is characterized in that: include LASER Light Source, reflection type optical fiber turbulent flow detection probe, total reflective mirror, the signal processing module that can modulate, the emergent light of said LASER Light Source is divided into two-way after through a coupling mechanism, and one road emergent light is sent into reflection type optical fiber turbulent flow detection probe for surveying light; Another road emergent light is that reference light is sent into signal processing module; Said reflection type optical fiber turbulent flow detection probe comprises collimating apparatus, and the input optical fibre, the output optical fibre that are connected to optoisolator respectively, and said input optical fibre one termination has the FC/APC joint; The other end inserts the collimating apparatus light inlet; Said output optical fibre one termination has the FC/APC joint, and the other end inserts the collimating apparatus light-emitting window, and said total reflective mirror and collimating apparatus keep at a certain distance away; The reflecting surface of total reflective mirror is aimed at collimating apparatus, and turbulent flow to be detected is through interval between total reflective mirror and the collimating apparatus; Said input optical fibre is introduced through the FC/APC joint and is surveyed light; And will survey light and send in the collimating apparatus after through optoisolator; A part is surveyed light and in collimating apparatus, is reflexed to output optical fibre; Remainder is surveyed and is incident to total reflective mirror after collimating apparatus is crossed in transmittance; Be transmitted in the collimating apparatus again after the reflection of said total reflective mirror, and be incident to output optical fibre with survey light by collimating apparatus directly the part of reflection interfere the generation interference light signal, send into signal processing module behind the optoisolator of said interference light signal through output optical fibre.
Described high precision reflection type optical fiber turbulent flow pick-up unit; It is characterized in that: the LASER Light Source that can modulate is made up of the signal generator of semiconductor laser, access semiconductor laser modulated terminal; Said signal generator sends the electric current of modulation signal with semiconductor laser modulation to semiconductor laser, the carrier wave laser that semiconductor laser output is changed with said modulation signal.
Described high precision reflection type optical fiber turbulent flow pick-up unit is characterized in that: also include circulator in the reflection type optical fiber turbulent flow detection probe, said input optical fibre, the output optical fibre other end insert circulator respectively, insert in the collimating apparatus through circulator again.
Described high precision reflection type optical fiber turbulent flow pick-up unit, it is characterized in that: said collimating apparatus has the sphere termination, and the end face of collimating apparatus is coated with 30% the anti-film that increases.
Described high precision reflection type optical fiber turbulent flow pick-up unit; It is characterized in that: said signal processing module comprises computing machine, inserts the data collecting card of computing machine, inserts the two-way photodetector in the data collecting card; Wherein No. one photodetector receives reference optical signal, and another road photodetector receives interference light signal.
A kind of high precision reflection type optical fiber turbulent flow detection method is characterized in that: may further comprise the steps:
(1) control-signals generator is sent modulation signal to semiconductor laser, the carrier wave laser that the semiconductor laser outgoing changes with modulation signal;
(2) the computer control capture card carries out signals collecting; Two photodetectors that capture card inserts are gathered reference optical signal, interference light signal respectively and respectively reference optical signal, interference light signal are changed into electric signal, and the electric signal that capture card is corresponding with reference optical signal, the electric signal that interference light signal is corresponding are sent in the computing machine respectively;
(3) electric signal that interference light signal is corresponding is filtered direct current with the signal of gained and is handled divided by the corresponding electric signal of reference optical signal in computing machine, needing to obtain the turbulence signal of demodulation;
(4) from reference signal, extract the waveform signal
of carrier wave, and calculate varying type
;
(5) will need the turbulence signal of demodulation to multiply by signal
,
respectively; Again product is sent into filtering in the BPF. respectively; Filtered results added; Result with addition calculates through the correlation demodulation algorithm at last, obtains the turbulent flow random phase poor
between collimating apparatus and the total reflective mirror;
(6) the relational expression
through
with
;
be converted into the small fluctuating of refractive index
between collimating apparatus and the total reflective mirror; The fluctuating variance
of adding up
then; L is the distance between collimating apparatus and the total reflective mirror in the formula, and
is Wavelength of Laser.
Among the present invention; Reflection type optical fiber turbulent flow detection probe has only an arm; The optical path difference of interference light is the light path of light through air, and promptly light needs the turbulent flow phase differential of demodulation to utilize the correlation demodulation algorithm to obtain through the light path at interval between total reflective mirror and the collimating apparatus; Realized direct detection local atmospheric turbulence intensity, measurement data can reflect real atmospheric condition.
The present invention is applicable to the environment and the rainy weather of marine corrosive, has improved time, spatial resolution, and detection speed is fast, and is highly sensitive, and volume is little, and is easy of integration, simple to operate.
Description of drawings
Fig. 1 is apparatus of the present invention schematic diagram.
Fig. 2 is a reflection type optical fiber turbulent flow detection probe structural representation of the present invention.
Fig. 3 is a reflection type optical fiber turbulent flow detection probe optical schematic diagram of the present invention.
Fig. 4 is the inventive method correlation demodulation calculation flow chart.
Fig. 5 is the interference signal curve map.
Fig. 6 is the phase signal curve map.
Embodiment
Like Fig. 1, Fig. 2, shown in Figure 3.High precision reflection type optical fiber turbulent flow pick-up unit; Include LASER Light Source, reflection type optical fiber turbulent flow detection probe 2, total reflective mirror 3, the signal processing module that to modulate; The LASER Light Source that can modulate is made up of the signal generator 5 of semiconductor laser 1, access semiconductor laser 1 modulated terminal; Signal generator 5 sends the electric current of modulation signal with semiconductor laser modulation 1 to semiconductor laser 1, the carrier wave laser that semiconductor laser 1 output is changed with modulation signal.The emergent light of LASER Light Source 1 is divided into two-way after through a coupling mechanism 4; One road emergent light is sent into reflection type optical fiber turbulent flow detection probe 2 for surveying light, and another road emergent light is that reference light is sent into signal processing module, and reflection type optical fiber turbulent flow detection probe 2 comprises collimating apparatus 201; And be connected to respectively optoisolator 202 input optical fibre 204, be connected to optoisolator 203 output optical fibres 205; Input optical fibre 204 1 terminations have FC/APC joint 206, and the other end inserts collimating apparatus 201 light inlets, and output optical fibre 205 1 terminations have FC/APC joint 207; The other end inserts collimating apparatus light-emitting window 201; Total reflective mirror 3 keeps at a certain distance away with collimating apparatus 201, and the reflecting surface of total reflective mirror 3 is aimed at collimating apparatus 201, and turbulent flow to be detected is through interval between total reflective mirror 3 and the collimating apparatus 201; Input optical fibre 204 is introduced through FC/APC joint 206 and is surveyed light; And will survey light and send in the collimating apparatus 201 after through optoisolator 202; A part is surveyed light and in collimating apparatus 201, is reflexed to output optical fibre 205; Remainder is surveyed and is incident to total reflective mirror 3 after collimating apparatus 201 is crossed in transmittance; Be transmitted into again in the collimating apparatus 201 after total reflective mirror 3 reflection, and be incident to output optical fibre 205 with survey light by collimating apparatus 201 directly the parts of reflection interfere the generation interference light signal, send into signal processing module behind the optoisolator 203 of interference light signal through output optical fibre 205.
Also include circulator 208 in the reflection type optical fiber turbulent flow detection probe 2, input optical fibre 204, output optical fibre 205 other ends insert circulator 208 respectively, insert in the collimating apparatus 201 through circulator 208 again.Collimating apparatus 201 has the sphere termination, and the end face of collimating apparatus 201 is coated with 30% the anti-film that increases.
Signal processing module comprises computing machine 6, inserts the data collecting card 7 of computing machine 6, inserts the two-way photodetector 8,9 in the data collecting card 7, and wherein No. one photodetector 8 receives reference optical signal, and another road photodetector 9 receives interference light signal.
As shown in Figure 4.A kind of high precision reflection type optical fiber turbulent flow detection method may further comprise the steps:
(1) control-signals generator is sent modulation signal to semiconductor laser, the carrier wave laser that the semiconductor laser outgoing changes with modulation signal;
(2) the computer control capture card carries out signals collecting; Two photodetectors that capture card inserts are gathered reference optical signal, interference light signal respectively and respectively reference optical signal, interference light signal are changed into electric signal, and the electric signal that capture card is corresponding with reference optical signal, the electric signal that interference light signal is corresponding are sent in the computing machine respectively;
(3) electric signal that interference light signal is corresponding is filtered direct current with the signal of gained and is handled divided by the corresponding electric signal of reference optical signal in computing machine, needing to obtain the turbulence signal of demodulation;
(4) from reference signal, extract the waveform signal
of carrier wave, and calculate varying type
;
(5) will need the turbulence signal of demodulation to multiply by signal
,
respectively; Again product is sent into filtering in the BPF. respectively; Filtered results added; Result with addition calculates through the correlation demodulation algorithm at last, obtains the turbulent flow random phase poor
between collimating apparatus and the total reflective mirror;
(6) the relational expression
through
with
;
be converted into the small fluctuating of refractive index
between collimating apparatus and the total reflective mirror; The fluctuating variance
of adding up
then; L is the distance between collimating apparatus and the total reflective mirror in the formula, and
is Wavelength of Laser.
Theoretical foundation of the present invention: reflection type optical fiber turbulent flow detection probe is coated with 30% by an end face and increases the collimating apparatus of anti-film, a total reflective mirror, an optical circulator and two optoisolators and form.What collimating apparatus was used is the sphere head, avoids producing between collimating apparatus and the total reflective mirror concussion of light.When carrier wave laser gets into probe, at first disturb to avoid joint end face reflected light that laser instrument is produced through an optoisolator, get into optical circulator then; Get into collimating apparatus again, light is returned at collimating apparatus end face 30%, and 70% by transmission; Behind the air section of transmitted light through one section 10cm length; In total reflective mirror reflected back collimating apparatus, in that laggard light of going in the optical fiber with the front first reflection interferes through the transmission of collimating apparatus end face, this interference signal has comprised the influence information of atmospheric turbulence to light.Gather interference signal, after signal Processing and phase demodulation algorithm, just can obtain the refractive index fluctuation of turbulent flow.
The reason that increases anti-film at collimating apparatus end face plating one deck 30%: the light intensity of supposing incident light is for
; The reflectivity of collimating apparatus end face is
; Then the light intensity through the light of collimating apparatus end face reflection is
; The light intensity of transmitted light is
, transmitted light through one section air after by completely reflecting mirror turn back to the light in the collimating apparatus light intensity is
.For the light intensity that makes two coherent light beams is close, so reflectivity should satisfy following relational expression:
Solve:
; Because transmitted light returns to produce certain loss and coating technique requirement through the air section back reflection, plate 30% the anti-film that increases on the end face of collimating apparatus.
The form of interference signal and demodulating algorithm
If the modulated voltage signal that signal generator produces
;
is the amplitude of signal, and
is the angular frequency of signal.When the modulation signal by the output current is
, voltage and current modulation rate
the laser controller must drive current:
The drive current luminous power modulation rate of use is
; The power frequency modulation rate is the semiconductor laser of
, and the luminous power and the frequency that get carrier wave laser are:
（4）
Where
and
optical power and frequency were straight traffic.When carrier wave laser after reflection type optical fiber turbulent flow detection probe, the phase differential that the two-beam that interferes produces is:
Wherein
is average air refractive index (
);
is for interfering the optical path difference of two-beam; C is the light velocity in the vacuum;
;
is a constant,
random phase introduced for atmospheric turbulence change.In order to prevent signal aliasing,
here.Be respectively
if interfere the number percent that the power of two-beam accounts for general power; The power voltage transformation efficiency of photodetector is
(
), and then interference signal is:
Wherein
Carrier wave laser is divided into two-way with coupling mechanism, and one the tunnel directly gathers signal as a reference with capture card, and another road is through probe, and then reference signal and interference signal are following:
Reference signal:
(7)
Interference signal:
(8)
Divided by reference signal, after it being filtered the direct current processing, needing to obtain the signal
of demodulation to comprise the turbulent flow random phase interference signal.
carries out the Bessel series expansion to signal
multiplied each other with signal
and
respectively, through obtaining for behind the BPF. of
and
by frequency:
(16) formula and (17) formula addition the right are got:
and
have only a phase shift; Promptly want the phase differential of demodulation;
can obtain from reference signal, asks phase differential with correlation method then.
Correlation method demodulation phase difference principle: be directly proportional with the cosine value of its phase differential with the cross-correlation function value of frequently sinusoidal (or cosine) signal when time-delay is zero.If the expression formula of two row homogenous frequency signals does
(14)
I.e.
.
Computer Processing be the discrete-time series after A/D sampling; I.e.
,
; Wherein
,
is total sampling number.If
is sampling rate, the data length that a related operation is participated in definition is persistence length
.For discrete time series, the related operation in a persistence length becomes the summation formula by integration type, promptly
Be provided with total sampling number N just for
of persistence length
doubly; Obtain dynamic random phase difference time series
through related operation so, then the mean refractive index on the space length L rises and falls
is:
Variance:
Among the present invention; Using signal generator to produce a frequency is
; The cosine signal that amplitude is
is as the modulation signal of direct modulated laser light source; The frequency of turbulence signal generally has only tens to the hundreds of hertz, so the frequency of modulation signal is got
.
The light source that the present invention selects for use is the distributed semi conductor laser; Wavelength
; Coherent length is greater than 1m; The electric current that the modulation signal that sends through signal generator is regulated laser controller is finely tuned the output frequency of laser instrument, makes it to form carrier wave laser.This laser instrument volume Xiao Yi and optical fiber coupling, and the loss ratio that the light of this wave band is propagated in optical fiber is less.
Collimating apparatus is selected the sphere head for use, prevents that light from forming concussion between collimating apparatus and total reflective mirror, and collimating apparatus end face plating one deck 30% increases anti-film.
After carrier wave laser got into probe, 30% was reflected, and 70% by transmission, behind the air section of transmitted light through one section 10cm length, was interfered by the light that is reflected with the front in the total reflective mirror reflected back collimating apparatus, and this signal has comprised the influence information of turbulent atmosphere to laser.
The light that this device laser instrument sends is linearly polarized light; When laser process collimating apparatus end face, reflected light is consistent with the transmitted light polarization state, and total reflective mirror does not change the polarization polarization state of light; Air does not change polarization state of light yet, so the consistance of polarization state when having kept reference light and flashlight to interfere.
Collection interference signal, reference signal are carried out the signal Processing of a series of complicacies, and the demodulating algorithm principle is as shown in Figure 4.
Fiber connector is the FC/APC head; FC/APC fiber end face is the pitch angle about
, prevents the Fresnel reflection of fiber end face.
The present invention's probe is contained in an experiment ground, is connected with optical cable with optical fiber, and optical fiber, optical cable and total reflective mirror all are glasswares, and probe optical fiber shell is plastic products, all has corrosion resistance, so the present invention can realize the measurement of marine corrosive environment.
This probe detects the intensity of turbulent flow through atmospheric turbulence to the direct influence of light, can detect some information of atmosphere in fine, cloudy, cloudy day and rainy day, and this is highly significant.
Specific embodiment:
1, with a support static probe, the support of another band adjustment knob is total reflective mirror fixedly, and it is 10cm that adjusting support and knob make the distance between probe and total reflective mirror, and the energy that probe can receive reaches maximum value.
2, utilize signal generator to produce a cosine voltage signal
as modulation signal.
3, modulation signal directly is loaded on the controller of semiconductor laser, the electric current through the driving laser controller makes laser instrument produce the laser that changes with modulation signal, is called carrier wave laser.
4, with
coupling mechanism carrier wave laser is divided into two-way: the one tunnel connects the light inlet of reflection type optical fiber turbulent flow detection probe; Carrier wave laser penetrates from collimating apparatus; Behind the 10cm air section, returned by total reflective mirror, the light-emitting window of probe connects photodetector; Another road is directly through photodetector.
5, sampling rate
is set; Hits
; Be that 5s adds up a secondary data; Gather two paths of signals with capture card; Be called interference signal through a road of probe, another road signal is signal as a reference.
6, the interference signal of gathering is obtained signal
after divided by reference signal filter direct current.
7, from reference signal
, extract
signal; From the reference signal of gathering, extract maximal value
, the minimum value
of signal; Then
;
,
.
8,
signal is carried out
conversion and obtain signal
; Carry out
computing again, obtain signal
.
9, signal
is multiplied each other with
,
respectively; Be the BPF. of
and
through cutoff frequency again, two formula additions obtain signal
then.
10, signal
and signal
are carried out related operation; This device persistence length
gets 100; So this device can detect the frequency of turbulent flow for
, after computing, demodulates the random phase difference time series
that is caused by atmospheric turbulence.
11, through
(
) computing;
is converted into refractive index fluctuation
, then the fluctuating variance
of statistics
.
12, shown in Figure 6 is the interference signal that detects in the laboratory, can find out that fringe contrast is relatively good.
The phase place of 13, coming out through the demodulating algorithm demodulation is as shown in Figure 7, can find out that signal is more stable, and signal has small fluctuating on a fixed value, and these turbulent atmospheres that rise and fall just are to the influence of laser signal.
Claims (6)
1. high precision reflection type optical fiber turbulent flow pick-up unit; It is characterized in that: include LASER Light Source, reflection type optical fiber turbulent flow detection probe, total reflective mirror, the signal processing module that can modulate, the emergent light of said LASER Light Source is divided into two-way after through a coupling mechanism, and one road emergent light is sent into reflection type optical fiber turbulent flow detection probe for surveying light; Another road emergent light is that reference light is sent into signal processing module; Said reflection type optical fiber turbulent flow detection probe comprises collimating apparatus, and the input optical fibre, the output optical fibre that are connected to optoisolator respectively, and said input optical fibre one termination has the FC/APC joint; The other end inserts the collimating apparatus light inlet; Said output optical fibre one termination has the FC/APC joint, and the other end inserts the collimating apparatus light-emitting window, and said total reflective mirror and collimating apparatus keep at a certain distance away; The reflecting surface of total reflective mirror is aimed at collimating apparatus, and turbulent flow to be detected is through interval between total reflective mirror and the collimating apparatus; Said input optical fibre is introduced through the FC/APC joint and is surveyed light; And will survey light and send in the collimating apparatus after through optoisolator; A part is surveyed light and in collimating apparatus, is reflexed to output optical fibre; Remainder is surveyed and is incident to total reflective mirror after collimating apparatus is crossed in transmittance; Be transmitted in the collimating apparatus again after the reflection of said total reflective mirror, and be incident to output optical fibre with survey light by collimating apparatus directly the part of reflection interfere the generation interference light signal, send into signal processing module behind the optoisolator of said interference light signal through output optical fibre.
2. high precision reflection type optical fiber turbulent flow pick-up unit according to claim 1; It is characterized in that: the LASER Light Source that can modulate is made up of the signal generator of semiconductor laser, access semiconductor laser modulated terminal; Said signal generator sends the electric current of modulation signal with semiconductor laser modulation to semiconductor laser, the carrier wave laser that semiconductor laser output is changed with said modulation signal.
3. high precision reflection type optical fiber turbulent flow pick-up unit according to claim 1; It is characterized in that: also include circulator in the reflection type optical fiber turbulent flow detection probe; Said input optical fibre, the output optical fibre other end insert circulator respectively, insert in the collimating apparatus through circulator again.
4. high precision reflection type optical fiber turbulent flow pick-up unit according to claim 1, it is characterized in that: said collimating apparatus has the sphere termination, and the end face of collimating apparatus is coated with 30% the anti-film that increases.
5. high precision reflection type optical fiber turbulent flow pick-up unit according to claim 1; It is characterized in that: said signal processing module comprises computing machine, inserts the data collecting card of computing machine, inserts the two-way photodetector in the data collecting card; Wherein No. one photodetector receives reference optical signal, and another road photodetector receives interference light signal.
6. based on a kind of high precision reflection type optical fiber turbulent flow detection method of claim 1, it is characterized in that: may further comprise the steps:
(1) control-signals generator is sent modulation signal to semiconductor laser, the carrier wave laser that the semiconductor laser outgoing changes with modulation signal;
(2) the computer control capture card carries out signals collecting; Two photodetectors that capture card inserts are gathered reference optical signal, interference light signal respectively and respectively reference optical signal, interference light signal are changed into electric signal, and the electric signal that capture card is corresponding with reference optical signal, the electric signal that interference light signal is corresponding are sent in the computing machine respectively;
(3) electric signal that interference light signal is corresponding is filtered direct current with the signal of gained and is handled divided by the corresponding electric signal of reference optical signal in computing machine, needing to obtain the turbulence signal of demodulation;
(4) from reference signal, extract the waveform signal
of carrier wave, and calculate varying type
;
(5) will need the turbulence signal of demodulation to multiply by signal
,
respectively; Again product is sent into filtering in the BPF. respectively; Filtered results added; Result with addition calculates through the correlation demodulation algorithm at last, obtains the turbulent flow random phase poor
between collimating apparatus and the total reflective mirror;
(6) the relational expression
through
with
;
be converted into the small fluctuating of refractive index
between collimating apparatus and the total reflective mirror; The fluctuating variance
of adding up
then; L is the distance between collimating apparatus and the total reflective mirror in the formula, and
is Wavelength of Laser.
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| CN109883650A (en) * | 2019-03-28 | 2019-06-14 | 哈尔滨工业大学 | The device of perception oceanic turbulence and ocean particle based on laser interference |
| CN111323790A (en) * | 2018-12-16 | 2020-06-23 | 聚源光电(无锡)有限公司 | Frequency domain reflection type aerosol laser radar |
| CN115877032A (en) * | 2022-12-08 | 2023-03-31 | 青岛众瑞智能仪器股份有限公司 | Method for detecting flue gas flow velocity by light interference scintillation method and novel flue gas flow velocity measuring instrument |
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