CN102419247B - 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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- CN102419247B CN102419247B CN 201110238322 CN201110238322A CN102419247B CN 102419247 B CN102419247 B CN 102419247B CN 201110238322 CN201110238322 CN 201110238322 CN 201110238322 A CN201110238322 A CN 201110238322A CN 102419247 B CN102419247 B CN 102419247B
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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 optical turbulence ionization meter field, be specially a kind of high precision reflection type optical fiber turbulence 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 the turbulence effects such as beam drift, expansion, light intensity flicker, phase fluctuation.These effects are restricting the application of the optical engineering such as Laser Atmospheric Transmission, free space optical communication, laser ranging, photoimaging.Therefore, the optical turbulence information on the Obtaining Accurate 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 at present these parameters mainly contains temperature fluctuation method and optical means.
The temperature fluctuation method is a kind of indirect method of measurement that obtains atmospheric turbulence refractive index fluctuation characteristic by measuring atmospheric temperature fluctuations, and the fluctuation characteristic of its supposition air refraction depends on the fluctuation characteristic of temperature fully, and surveying instrument commonly used is 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 optical turbulence.Along with going deep into of research, the method itself intrinsic defective that becomes increasingly conspicuous, the metal platinum filament is easily fractureed, is polluted, and room and time resolution is limited, can not detect microturbulence etc.Optical means is to utilize in turbulent atmosphere the propagation effect of light to measure the turbulent flow optical parametric, and method commonly used has Laser Scintillation method, arrival angle fluctuation method etc.The theoretical foundation of Laser Scintillation method measurement turbulence intensity is that the Rytov under weak fluctuation condition is approximate, and when turbulent flow was enough strong, the 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 that are used for the derivation radar equation are difficult to be satisfied, the form of radar equation itself waits further perfect, and the 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 is all to grow the average result in path, and the method is difficult to obtain local refractive index fluctuation characteristic.
Due to the restriction that is subjected to technical conditions, traditional optical turbulence measurement means is indirectly or is measurement under supposed premise, its result exists uncertain, and have and report: 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, is used for directly obtaining the small fluctuating of local turbulent atmosphere refractive index, and its theoretical precision can reach
Magnitude, but there is no afterwards relevant report.For Fiber Mach-Zehnder Interferometer, two arms are arranged usually, an arm is as pickup arm, and another arm is as the reference arm.Interferometer detects external information by being subjected to extraneous disturbance to carry the pickup arm of external information.Atmospheric turbulence is faint, random, if detect turbulent flow with the closure arm Fiber Mach-Zehnder Interferometer, can not well reflect the turbulent flow situation.In recent years, along with the development of photoelectric technology and phase generated carrier modulation and demodulation technology, occurred utilizing the method for two collimator-alignment to detect turbulent flow information.At first this kind method 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 air, accepting laser as flashlight with another collimating apparatus, another bundle conduct is with reference to light, 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 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 that 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 more expensive to protect inclined to one side device, makes cost increase many; On the other hand, collimator of PMF has increased the difficulty of aiming at.
Summary of the invention
The object of the invention is to provide a kind of high precision reflection type optical fiber turbulence pick-up unit and method, has circumscribed problem to solve prior art atmospheric optical turbulence detection system measurement inconvenience.
In order to achieve the above object, the technical solution adopted in the present invention is:
high precision reflection type optical fiber turbulence pick-up unit, it is characterized in that: include the LASER Light Source that to modulate, the reflection type optical fiber turbulence detection probe, total reflective mirror, signal processing module, the emergent light of described LASER Light Source is divided into two-way after through a coupling mechanism, one road emergent light is sent into the reflection type optical fiber turbulence detection probe for surveying light, another road emergent light is that reference light is sent into signal processing module, described reflection type optical fiber turbulence detection probe comprises collimating apparatus, and the input optical fibre that is connected to respectively optoisolator, output optical fibre, described input optical fibre one termination has the FC/APC joint, other end access collimating apparatus light inlet, described output optical fibre one termination has the FC/APC joint, other end access collimating apparatus light-emitting window, described 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 by interval between total reflective mirror and collimating apparatus, described input optical fibre is introduced by the FC/APC joint and is surveyed light, and will survey light and send in collimating apparatus after by optoisolator, a part is surveyed light and reflex to output optical fibre in collimating apparatus, remainder is surveyed and is incident to total reflective mirror after collimating apparatus is crossed in the light transmission, be transmitted into again in collimating apparatus after described total reflective mirror reflection, 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 after the optoisolator of described interference light signal by output optical fibre.
Described high precision reflection type optical fiber turbulence pick-up unit, it is characterized in that: the LASER Light Source that can modulate is made of the signal generator of semiconductor laser, access semiconductor laser modulated terminal, described signal generator sends modulation signal with the electric current of semiconductor laser modulation to semiconductor laser, the carrier wave laser that semiconductor laser output is changed with described modulation signal.
Described high precision reflection type optical fiber turbulence pick-up unit is characterized in that: also include circulator in the reflection type optical fiber turbulence detection probe, described input optical fibre, the output optical fibre other end access respectively circulator, access in collimating apparatus by circulator again.
Described high precision reflection type optical fiber turbulence pick-up unit, it is characterized in that: described collimating apparatus has spherical end, and the end face of collimating apparatus is coated with 30% the anti-film that increases.
Described high precision reflection type optical fiber turbulence pick-up unit, it is characterized in that: described signal processing module comprises computing machine, the data collecting card of access computing machine, the two-way photodetector in the access data capture 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 turbulence detection method is characterized in that: comprise the following steps:
(1) the control signal generator sends 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 of capture card access gather respectively reference optical signal, interference light signal and change into electric signal with reference to light signal, interference light signal respectively, and capture card is sent to respectively in computing machine with reference to electric signal corresponding to light signal, electric signal that interference light signal is corresponding;
(3) electric signal that interference light signal is corresponding divided by electric signal corresponding to reference optical signal, is filtered direct current with the signal of gained and is processed in computing machine, needing to obtain the turbulence signal of demodulation;
(4) extract the waveform signal of carrier wave from reference signal
, and calculate varying type
(5) will need the turbulence signal of demodulation to multiply by respectively signal
,
, then product is sent into respectively filtering in bandpass filter, and filtered results added is calculated the result of addition at last by the correlation demodulation algorithm, and the turbulent flow random phase that obtains between collimating apparatus and total reflective mirror is poor
(6) warp
With
Relational expression
, will
Be converted into the small fluctuating of refractive index between collimating apparatus and total reflective mirror
, then add up
The fluctuating variance
, in formula, L is the distance between collimating apparatus and total reflective mirror,
Wavelength for laser.
In the present invention, the reflection type optical fiber turbulence detection probe only has an arm, the optical path difference of interference light is that light is through the light path of air, be that light is through the light path at interval between total reflective mirror and collimating apparatus, need the turbulent flow phase differential of demodulation to utilize the correlation demodulation algorithm to obtain, realized direct-detection local atmospheric turbulence intensity, measurement data can reflect real atmospheric condition.
The present invention is applicable to 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 reflection type optical fiber turbulence detection probe structural representation of the present invention.
Fig. 3 is reflection type optical fiber turbulence 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
As Fig. 1, Fig. 2, shown in Figure 3.High precision reflection type optical fiber turbulence pick-up unit, include LASER Light Source, reflection type optical fiber turbulence detection probe 2, total reflective mirror 3, the signal processing module that to modulate, the LASER Light Source that can modulate is made of the signal generator 5 of semiconductor laser 1, access semiconductor laser 1 modulated terminal, signal generator 5 sends modulation signal with the electric current of 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 turbulence detection probe 2 for surveying light, another road emergent light is that reference light is sent into signal processing module, reflection type optical fiber turbulence detection probe 2 comprises collimating apparatus 201, and the input optical fibre 204 that is connected to respectively optoisolator 202, be connected to optoisolator 203 output optical fibres 205, input optical fibre 204 1 terminations have FC/APC joint 206, other end access collimating apparatus 201 light inlets, output optical fibre 205 1 terminations have FC/APC joint 207, other end access collimating apparatus light-emitting window 201, total reflective mirror 3 keeps at a certain distance away with collimating apparatus 201, the reflecting surface of total reflective mirror 3 is aimed at collimating apparatus 201, and turbulent flow to be detected is by interval between total reflective mirror 3 and collimating apparatus 201, input optical fibre 204 is introduced by FC/APC joint 206 and is surveyed light, and will survey light and send in collimating apparatus 201 after by optoisolator 202, a part is surveyed light and reflex to output optical fibre 205 in collimating apparatus 201, remainder is surveyed and is incident to total reflective mirror 3 after collimating apparatus 201 is crossed in the light transmission, be transmitted into again in collimating apparatus 201 after total reflective mirror 3 reflections, and be incident to output optical fibre 205 with survey light by collimating apparatus 201 directly the part of reflection interfere the generation interference light signal, send into signal processing module after the optoisolator 203 of interference light signal by output optical fibre 205.
Also include circulator 208 in reflection type optical fiber turbulence detection probe 2, input optical fibre 204, output optical fibre 205 other ends access respectively circulator 208, access in collimating apparatus 201 by circulator 208 again.Collimating apparatus 201 has spherical end, and the end face of collimating apparatus 201 is coated with 30% the anti-film that increases.
Signal processing module comprises computing machine 6, the data collecting card 7 of access computing machine 6, the two-way photodetector 8,9 in access data capture 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 turbulence detection method comprises the following steps:
(1) the control signal generator sends 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 of capture card access gather respectively reference optical signal, interference light signal and change into electric signal with reference to light signal, interference light signal respectively, and capture card is sent to respectively in computing machine with reference to electric signal corresponding to light signal, electric signal that interference light signal is corresponding;
(3) electric signal that interference light signal is corresponding divided by electric signal corresponding to reference optical signal, is filtered direct current with the signal of gained and is processed in computing machine, needing to obtain the turbulence signal of demodulation;
(4) extract the waveform signal of carrier wave from reference signal
, and calculate varying type
(5) will need the turbulence signal of demodulation to multiply by respectively signal
,
, then product is sent into respectively filtering in bandpass filter, and filtered results added is calculated the result of addition at last by the correlation demodulation algorithm, and the turbulent flow random phase that obtains between collimating apparatus and total reflective mirror is poor
(6) warp
With
Relational expression
, will
Be converted into the small fluctuating of refractive index between collimating apparatus and total reflective mirror
, then add up
The fluctuating variance
, in formula, L is the distance between collimating apparatus and total reflective mirror,
Wavelength for laser.
Theoretical foundation of the present invention: the reflection type optical fiber turbulence 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 total reflective mirror the concussion of light.When carrier wave laser enters probe, at first disturb to avoid joint end face reflected light that laser instrument is produced through an optoisolator, then enter optical circulator, enter collimating apparatus, light is returned at collimating apparatus end face 30% again, and 70% is transmitted, after the air section of transmitted light through one section 10cm length, be reflected back in collimating apparatus by total reflective mirror, interfere with the light of front first reflection in entering optical fiber laggard through the transmission of collimating apparatus end face, this interference signal has comprised the affect information of atmospheric turbulence on 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
, the reflectivity of collimating apparatus end face is
, the light intensity through the light of collimating apparatus end face reflection is
, the light intensity of transmitted light is
, the light intensity that transmitted light turns back to the light in collimating apparatus by completely reflecting mirror after through one section air is
For the light intensity that makes two relevant light beams is close, therefore reflectivity should satisfy following relational expression:
（1）
Solve:
, because transmitted light returns to produce certain loss and coating technique requirement through the air section back reflection, therefore plate 30% the anti-film that increases on the end face of collimating apparatus.
The form of interference signal and demodulating algorithm
If signal generator produces
Modulated voltage signal,
The amplitude of signal,
It is the angular frequency of signal.When modulation signal through output current is
, the electric current and voltage modulation rate is
Laser controller get drive current:
With drive current optical power modulation rate be
, the power frequency modulation rate is
Semiconductor laser, the luminous power and the frequency that get carrier wave laser are:
（3）
（4）
Wherein
With
Be respectively the DC quantity of luminous power and frequency.After the reflection type optical fiber turbulence detection probe, the phase differential that the two-beam that interferes produces is when carrier wave laser:
（5）
Wherein
For the average air refractive index (
),
For interfering the optical path difference of two-beam, c is the light velocity in vacuum,
,
Be a constant,
The random phase of introducing for atmospheric turbulence changes.In order to prevent signal aliasing, here
If interfering the number percent that the power of two-beam accounts for general power is respectively
, the power voltage transformation efficiency of photodetector is
(
), interference signal is:
Wherein
Carrier wave laser is divided into two-way with coupling mechanism, and one the tunnel directly gathers conduct with reference to signal with capture card, and another road is through probe, and reference signal and interference signal are as follows:
Reference signal:
(7)
Interference signal:
(8)
Interference signal divided by reference signal, is being filtered the signal that needing to obtain demodulation after direct current is processed to it
Comprised the turbulent flow random phase.To signal
Carry out the Bessel series expansion,
Will
Respectively with signal
With
Multiply each other, through by frequency being
With
Bandpass filter after obtain:
(16) formula is got on the right of (17) formula addition:
The poor principle of correlation method demodulation phase: be directly proportional to 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 is
In formula
With
The amplitude of signal,
It is the phase differential of two signals.According to the definition of related function, when the time postpones to be zero
Namely
Computing machine is processed is discrete-time series after the A/D sampling, namely
,
, wherein
,
Be total sampling number.If
Be sampling rate, the data length that definition participates in a related operation is persistence length
For discrete time series, the related operation in a persistence length becomes the summation formula by integration type, namely
Total sampling number N is set just is persistence length
Doubly, obtain the poor time series of dynamic random phase through related operation so
, the mean refractive index on space length L rises and falls
For:
Variance:
In the present invention, with frequency of signal generator generation be
, amplitude is
Cosine signal as the modulation signal of direct modulated laser source, the frequency of turbulence signal generally only has tens to the hundreds of hertz, therefore the frequency of modulation signal is got
The light source that the present invention selects is the distributed semi conductor laser, wavelength
, coherent length is greater than 1m, and the electric current that the modulation signal that sends by 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 that the light of this wave band is propagated in optical fiber is smaller.
Collimating apparatus is selected the sphere head, 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 entered probe, 30% was reflected, and 70% is transmitted, transmitted light through the long air section of one section 10cm after, be reflected back in collimating apparatus by total reflective mirror and interfere with the light that is reflected previously, this signal has comprised the affect information of turbulent atmosphere on 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 state of polarized light, air does not change the polarisation of light attitude yet, therefore 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 series of complex, and the demodulating algorithm principle as shown in Figure 4.
Fiber connector is the FC/APC head, and FC/APC fiber end face is
The pitch angle of left and right prevents the Fresnel reflection of fiber end face.
The present invention's probe is contained on experimental site, is connected with optical cable with optical fiber, and optical fiber, optical cable and total reflective mirror are all glasswares, and probe optical fiber shell is plastic products, all has corrosion resistance, therefore the present invention can realize the measurement of marine corrosive environment.
This probe detects the intensity of turbulent flow on the direct impact of light by atmospheric turbulence, can detect some information of atmosphere in fine day, 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 by the driving laser controller makes laser instrument produce the laser that changes with modulation signal, is called carrier wave laser.
4, use
Coupling mechanism is divided into two-way with carrier wave laser: the one tunnel connects the light inlet of reflection type optical fiber turbulence detection probe, and carrier wave laser penetrates from collimating apparatus, is returned by total reflective mirror after the 10cm air section, and the light-emitting window of probe connects photodetector; Another road is directly through photodetector.
5, sampling rate is set
, hits
, namely 5s statistics one secondary data, gather two paths of signals with capture card, is called interference signal through a road of probe, and another road signal is as the reference signal.
6, the interference signal that gathers is obtained signal after divided by reference signal filter direct current
7, from reference signal
Middle extraction
Signal, the maximal value of extraction signal from the reference signal that gathers
, minimum value
,
,
,
8, will
Signal carries out
Conversion obtains signal
, then carry out
Computing obtains signal
9, with signal
Respectively with
,
Multiply each other, then through cutoff frequency be
With
Bandpass filter, then two formula additions obtain signal
10, with signal
With signal
Carry out related operation, this device persistence length
Get 100, therefore this device can detect the frequency of turbulent flow be
, demodulate the poor time series of the random phase that is caused by atmospheric turbulence after computing
11, pass through
(
) computing, will
Be converted into refractive index fluctuation
, then add up
The fluctuating variance
12, Figure 6 shows that the interference signal that detects in the laboratory, can find out that fringe contrast is relatively good.
13, by demodulating algorithm demodulation phase place out as shown in Figure 7, can find out that signal is more stable, signal has small fluctuating on a fixed value, these turbulent atmosphere impacts on laser signal just that rise and fall.
Claims (6)
1. high precision reflection type optical fiber turbulence pick-up unit, it is characterized in that: include the LASER Light Source that to modulate, the reflection type optical fiber turbulence detection probe, total reflective mirror, signal processing module, the emergent light of described LASER Light Source is divided into two-way after through a coupling mechanism, one road emergent light is sent into the reflection type optical fiber turbulence detection probe for surveying light, another road emergent light is that reference light is sent into signal processing module, described reflection type optical fiber turbulence detection probe comprises collimating apparatus, and the input optical fibre that is connected to respectively optoisolator, output optical fibre, described input optical fibre one termination has the FC/APC joint, other end access collimating apparatus light inlet, described output optical fibre one termination has the FC/APC joint, other end access collimating apparatus light-emitting window, described 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 by interval between total reflective mirror and collimating apparatus, described input optical fibre is introduced by the FC/APC joint and is surveyed light, and will survey light and send in collimating apparatus after by optoisolator, a part is surveyed light and reflex to output optical fibre in collimating apparatus, remainder is surveyed and is incident to total reflective mirror after collimating apparatus is crossed in the light transmission, be transmitted into again in collimating apparatus after described total reflective mirror reflection, 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 after the optoisolator of described interference light signal by output optical fibre.
2. high precision reflection type optical fiber turbulence pick-up unit according to claim 1, it is characterized in that: the LASER Light Source that can modulate is made of the signal generator of semiconductor laser, access semiconductor laser modulated terminal, described signal generator sends modulation signal with the electric current of semiconductor laser modulation to semiconductor laser, the carrier wave laser that semiconductor laser output is changed with described modulation signal.
3. high precision reflection type optical fiber turbulence pick-up unit according to claim 1, it is characterized in that: also include circulator in the reflection type optical fiber turbulence detection probe, described input optical fibre, the output optical fibre other end access respectively circulator, access in collimating apparatus by circulator again.
4. high precision reflection type optical fiber turbulence pick-up unit according to claim 1, it is characterized in that: described collimating apparatus has spherical end, and the end face of collimating apparatus is coated with 30% the anti-film that increases.
5. high precision reflection type optical fiber turbulence pick-up unit according to claim 1, it is characterized in that: described signal processing module comprises computing machine, the data collecting card of access computing machine, the two-way photodetector in the access data capture card, wherein No. one photodetector receives reference optical signal, and another road photodetector receives interference light signal.
6. based on the high precision reflection type optical fiber turbulence detection method of the high precision reflection type optical fiber turbulence pick-up unit of claim 1, it is characterized in that: comprise the following steps:
(1) the control signal generator sends 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 of capture card access gather respectively reference optical signal, interference light signal and change into electric signal with reference to light signal, interference light signal respectively, and capture card is sent to respectively in computing machine with reference to electric signal corresponding to light signal, electric signal that interference light signal is corresponding;
(3) electric signal that interference light signal is corresponding divided by electric signal corresponding to reference optical signal, is filtered direct current with the signal of gained and is processed in computing machine, needing to obtain the turbulence signal of demodulation;
(4) extract the waveform signal cos (w of carrier wave from reference signal
cT), reach calculating varying type sin (2w
cT);
(5) will need the turbulence signal of demodulation to multiply by respectively signal cos (w
cT), sin (2w
cT), then product is sent into respectively filtering in bandpass filter, filtered results added is calculated the result of addition at last by the correlation demodulation algorithm, and the turbulent flow random phase that obtains between collimating apparatus and total reflective mirror is poor
(6) through Δ n with
Relational expression
, will
Be converted into the small fluctuating Δ of the refractive index n between collimating apparatus and total reflective mirror, the fluctuating variances sigma of then adding up Δ n
2(Δ n), in formula, L is the distance between collimating apparatus and total reflective mirror, λ is the wavelength of laser.
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| CN101957317A (en) * | 2010-09-02 | 2011-01-26 | 长春理工大学 | Altitude distribution mode measurer of refractive index structural constants of atmospheric turbulence |
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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 |
| CN109883650B (en) * | 2019-03-28 | 2020-07-24 | 哈尔滨工业大学 | Device for sensing ocean turbulence and ocean particles based on laser interference |
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