CN104764898B - It is a kind of to realize two kinds of velocity measuring techniques to a measuring point while the device of repetition measurement using single probe monochromatic light road - Google Patents
It is a kind of to realize two kinds of velocity measuring techniques to a measuring point while the device of repetition measurement using single probe monochromatic light road Download PDFInfo
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Abstract
Using single probe monochromatic light road realize device of two kinds of velocity measuring techniques to measuring point repetition measurement simultaneously the invention discloses a kind of, including signal light laser, with reference to light laser, optical fiber circulator, optical fiber holes probe, fiber optic splitter, photodetector and oscillograph；The present invention solves current laser Doppler velocity technique both domestic and external and is difficult by the problem of single holes probe carries out two kinds of velocity measuring techniques synchronization repetition measurements to a measuring point with single set light channel structure realization, meets the requirement that multiple technologies repetition measurement is carried out in single-shot experiment that the various fields such as shock wave and detonation physics, explosive research, light laser are proposed to velocity measuring technique.
Description
Technical field
It is especially a kind of to realize two kinds of velocity measuring techniques to one using single probe monochromatic light road the present invention relates to laser velocimeter field
The device of the synchronous repetition measurement of individual measuring point.
Background technology
In the research field such as shock wave and detonation physics, explosive research, light laser, pulse power, ultrahigh speed experiment, weapons
In, speed is always key issue and needs the major parameter of diagnosis：Continuous, the non-contacting various materials of measurement are needed in punching
The free surface velocity history hit under ripple effect；The measurement of flyer velocity and particle rapidity is that Shock wave physics and detonation wave physics are ground
Unusual concern in studying carefully；Diagnose speed, detonation wave front of explosive-driven flying sheet etc. under explosion velocity of explosive, different loading environments
Explosive detonation information.
Laser Doppler velocity technique, especially all -fiber doppler velocity interferometer（Photonic Doppler
Velocimetry, PDV, the country are also referred to as DPS or DISAR）, with non-cpntact measurement, temporal resolution is high, the degree of accuracy is high, make
With it is simple, exempt from debugging the advantages of, be used widely in above-mentioned field, it has also become the main means that test the speed.
Mainly there are two kinds of PDV velocity measuring techniques in the world at present, one kind is conventional PDV velocity measuring techniques, zero based on single light source
Difference detection, another is optical heterodyne PDV velocity measuring techniques, the heterodyne detection based on double light sources, and they are to utilize interference technique
Obtain the velocity information of target to be measured, i.e., the target surface light echo to be measured being collected into holes probe（With target velocity to be measured
Information, power is more faint, is usually no more than 10mW, typically smaller than 1mW）As flashlight, by without the another of velocity information
Shu Guang is used as reference light（Typically arise directly from light source）, two-beam interfered in light path rear end, and interference light passes through photoelectricity again
Detector（Be converted to electric signal）And oscillograph（Carry out data acquisition）Afterwards, the speed of target to be measured is just can obtain using data processing
Spend information.
Zero-difference detections of the conventional PDV based on single light source, its basic structure is as shown in Figure 1.When measured target tests the speed to optical fiber
During probe movement, due to Doppler effect, the flashlight f being reflected back from tested moving target surfaced, relative to signal ray laser
The detection light f that device is sent through popping one's head in0, have small frequency shifts -- Doppler frequency shift fb。
In the basic structure of routine PDV shown in Fig. 1, reference light comes from optical fiber holes probe（Can be probe interior lights
The reflection that fine end face film is caused, it is also possible to the return loss caused for other internal devices of probe）To signal light laser
The fraction reflection that the luminous power of injection probe is carried out（It is most of to be irradiated to target surface to be measured through probe）, in order to reach compared with
Good interference condition is to strengthen interference effect, while making the interference luminous power after reference light and the signal interference of light in photodetector
Linearly interval（The service behaviour of photodetector can reach most preferably during hundreds of microwatts, but can not exceed its saturation value, the value
Typically in 1mW or so）, general reflectivity（Or return loss）Index is the optical signal power that can make to be back to optical fiber circulator
In the range of 500mW~1mW.Because reflection does not change the wavelength of optical signal, reference light has identical with detection light
Wavelength and frequency.
The structure that conventional PDV technologies are generally used at present is as shown in Fig. 2 it is changed to the basic structure shown in Fig. 1
Dynamic, reference light does not come from the reflection of optical fiber holes probe, and comes from signal light laser and separated through 1x2 fiber optic splitters
A part of luminous power, the part luminous power is adjusted to 500mW~1mW by adjustable attenuator, passes through a 2x2 optical fiber point
Beam device is interfered into rear end light path with flashlight.Interference light is divided into two parts by 2x2 fiber optic splitters, per portion by one
Photodetector is converted to voltage signal and recorded by a passage of oscillograph, so as to be set using each passage of oscillograph
Different amplitude ranges enter line amplitude repetition measurement, obtain two rate curves of target to be measured（Amplitude resolution is different, but speed is big
It is small identical）.
It is different from the basic structure shown in Fig. 1 in the structure shown in Fig. 2 that conventional PDV technologies are generally used at present, light
Can not typically there be the film for causing reflection or other devices for causing return loss, its remaining reflection in the inside of fine holes probe
Rate（Or return loss）Index is the optical signal power for being back to optical fiber circulator is less than 1mW.
Basic structure either shown in Fig. 1, or the usually used structure shown in Fig. 2, conventional PDV technologies are measured
Rate signal it is as shown in Figure 3（The actual signal got in actual Detonation Experiments）.
Double light source heterodyne technologies can strengthen the performance of conventional PDV technologies, when needing amplitude repetition measurement, what it was generally used
Structure is as shown in figure 4, the scattering light echo of target surface to be measured that flashlight is received still from probe, but reference light comes from
In second laser-refer to light laser, and with reference to the operation wavelength of light laser and signal light laser（That is frequency）Have
Certain difference.500mW~1mW is adjusted to by adjustable attenuator with reference to luminous power, then entered by a 2x2 fiber optic splitter
Rear end light path is interfered with flashlight.Interference light is divided into two parts by 2x2 fiber optic splitters, per portion by a photodetection
Device is converted to voltage signal and recorded by a passage of oscillograph, so as to the different width set using each passage of oscillograph
Measurement journey enters line amplitude repetition measurement, obtains two rate curves of target to be measured（Amplitude resolution is different, but the complete phase of velocity magnitude
Together）.Amplitude repetition measurement is not needed such as, then the basic structure of optical heterodyne PDV technologies is compared with Fig. 4, and 2x2 fiber optic splitters only have one
Individual output end（1x2 fiber optic splitters 7 are become）, the output end leads to merely through a photodetector and oscillograph
Road, finally obtains a Doppler frequency shift/rate curve of target to be measured.
For optical heterodyne PDV technologies, the inside of optical fiber holes probe still can not have the film for causing reflection or cause
Other devices of return loss, its remaining reflectivity（Or return loss）Index is the optical signal for making to be back to optical fiber circulator
Power is less than 1mW.
Using the reference light for having certain initial frequency difference, optical heterodyne PDV can measure Doppler by heterodyne detection technology
Frequency displacement/velocity information, and possess frequency downconverted and frequency up-converted dual-use function, wherein frequency up-converted can improve short go through
The temporal resolution and measurement accuracy of journey low speed measurement, frequency downconverted can significantly reduce measurement at a high speed to oscillograph band
Wide requirement.By taking frequency up-converted as an example, the rate signal of optical heterodyne PDV technologies measurement is as shown in Figure 5（Actual Detonation Experiments
In the actual signal that gets）, process segment actual speed is zero, but heterodyne PDV rate signal is not zero, but for one
Baseline（Amount of bias i.e. on reference axis longitudinal direction, the difference on the frequency of numerically equal to double light sources）, in movement segment, heterodyne PDV speed
Degree signal increases on the benchmark of baseline, therefore, to obtain now actual velocity magnitude, it is necessary to by data processing, by outside
The range value of poor PDV rate signals subtracts baseline value, i.e. actual speed and subtracts baseline value equal to heterodyne PDV speed.
In actual experimental test procedures, because above two velocity measuring technique needs each independent use one to test the speed
Probe, and by probe size（External diameter is generally several millimeters）With experimental provision installation requirement（Probe must be vertically just to measuring point, such as
Shown in Fig. 1, Fig. 2 and Fig. 4, otherwise probe can not effectively receive the scattered light of target surface to be measured）Limitation, a measuring point
（The less target to be measured of one size, or the larger target to be measured of size some ad-hoc location）Can only be by a probe measurement
（Because a point can only be just right by a probe vertical）, therefore a measuring point can only be selected in two kinds of PDV velocity measuring techniques
One of which technology carries out tachometric survey.Actually other kinds velocity measuring technique is there is also the problem, because being intended to respective independence
The probe of use one, so a measuring point can only use one of which technology to carry out tachometric survey.
Because speed is key issue and needs the major parameter of diagnosis, requirement of numerous application fields to speed data is equal
It is higher, but be difficult to test multiple repetition and be repeated several times test the speed by way of improve the accuracy of test data, reliability and
Stability, therefore, each application field propose the requirement that repetition measurement is carried out in single-shot experiment to velocity measuring technique, i.e., real in a hair
Multiple data are got by repetition measurement in testing, and it is analyzed, with confirmatory measurement result.
As noted previously, as a measuring point（The less target to be measured of one size, or the larger target to be measured of size certain
Individual ad-hoc location）One of which technology can only be selected to carry out tachometric survey in a variety of velocity measuring techniques, therefore, adopted in the world at present
The repetition measurement mode taken mainly has two kinds.
Topmost one kind（It is also the one kind generally used）, as shown in Figure 2 and Figure 4, a certain velocity measuring technique is obtained
The interference light with target speed information to be measured arrived, before photodetector progress opto-electronic conversion is entered, first with optical fiber point
Its power is divided into by beam device（Usually divide equally）Two parts, three parts or more parts, then respectively enter multiple photodetectors and enter
Row opto-electronic conversion, then respectively by multiple channel oscilloscopes（It is set to different amplitude ranges）Gather and be converted to digital quantity number
According to finally progress data processing gets a plurality of n-t curves of target to be measured.However, there is more ask in this repetition measurement mode
Topic：First, the speed repetition measurement of which not real meaning, because only power is split（Contained mesh to be measured is not split
Mark velocity information, but slavish copying）, no matter how many part be divided into by fiber optic splitter for interference light, per a velocity information
The velocity information of interference light is identical before splitting with power, its a plurality of n-t curve finally got, also with interference light not
The n-t curves for carrying out power segmentation and being directly obtained are identical（That is slavish copying）, the purpose actually done so, only
It is the different amplitude ranges set using each passage of oscillograph, line number is entered respectively to many parts of optical signals after interference light-power-divide
According to collection, the channel oscilloscope of small-range is used for the amplitude resolution and amplitude precision for improving signal, and the oscillograph of wide range leads to
Road is used to ensure that signal will not lose data when there is amplitude fluctuation because of beyond screen, briefly, using this
The purpose of mode be avoid because oscillograph amplitude range set it is improper and the problem of signal can not be collected, can only be referred to as
Amplitude repetition measurement, either " puppet " repetition measurement, i.e., not a measuring point gets two parts of this speed truly of velocity information
Repetition measurement, actually one measuring point is only capable of getting a velocity information, and finally obtained many parts of velocity informations are that this is a
The slavish copying of velocity information；Secondly as need to use multiple optical-electrical converters and channel oscilloscope, it is greatly improved and is
System cost（Optically measuring speeds technology needs to use the optical-electrical converter and oscillograph of high bandwidth, and its price is typically respectively tens of thousands of people
People's coin/and about 100,000 RMB/passage）And volume.
Second of repetition measurement mode, is target surface light echo to be measured -- the flashlight for arriving probe collection, first with 1x2 optical fiber point
Beam device is divided into part, then inputs two kinds of optically measuring speeds systems respectively（Such as routine PDV and optical heterodyne formula PDV）Interfered and answered
Survey.This repetition measurement mode realizes a measuring point and gets two parts of velocity informations, is the speed repetition measurement of real meaning, but there is also
More the problem of：First, the target surface light echo to be measured that probe collection is arrived is very faint, is usually no more than 10mW（Typically smaller than
1mW）, be divided into two parts be respectively used to two sets of optically measuring speeds systems if, because the power of every a flashlight is too small, it is difficult to
Preferable interference condition is reached in each set optically measuring speeds system（Need the signal light power for participating in interfering larger）, interference light
Signal quality can be greatly lowered, so as to carry out data processing to interference light to extract the difficulty of target speed information to be measured
Significantly increase, the quality of the target speed data to be measured finally given can also be deteriorated；Secondly, power mistake after flashlight is divided
Small, when being transmitted in the light path of each set optically measuring speeds system, the degree that its signal to noise ratio is degraded can be larger, even may be preceding
The noise of some device floods in the light path of end, so as to lose flashlight and its target velocity to be measured letter of carrying before interference
Breath；Finally, due to two sets of optically measuring speeds systems be each required to the light channel structure of complete set, at least one optical-electrical converter and
At least one channel oscilloscope, complexity, cost and the volume of whole system greatly increase.The problem of due to having more, and
Negative effect of these problems to the performance that tests the speed is larger, thus this repetition measurement mode is less is actually applied.
In summary, single holes probe is difficult by present and single set light channel structure is realized and carries out two kinds to a measuring point
The requirement of velocity measuring technique synchronization repetition measurement, but the various fields such as shock wave and detonation physics, explosive research, light laser are to the skill that tests the speed
Art proposes the requirement that the synchronous repetition measurement of multiple technologies is carried out in single-shot experiment, therefore is badly in need of solving this problem.
The content of the invention
The present invention is directed to above-mentioned problem, proposes a kind of new velocity measuring device, it is possible to use single to test the speed
Probe and single set light channel structure, realize the requirement that the synchronous repetition measurement of two kinds of velocity measuring techniques is carried out to a measuring point.
The technical solution adopted by the present invention is as described below：It is a kind of to utilize single holes probe and single set light channel structure realization pair
One measuring point carries out the device of the synchronous repetition measurement of two kinds of velocity measuring techniques, including signal light laser, with reference to light laser, fiber annular
Device, optical fiber holes probe, 1x2 fiber optic splitters, photodetector and oscillograph, the signal light laser export enough power
Detection light, the optical fiber holes probe is injected by the optical fiber circulator, and be irradiated to and treat from the optical fiber holes probe
On the moving target of survey, detection light reflects on moving target, and part reflected light is by probe collection, and reverse transfer is to light
Fine circulator, then the signal for carrying target speed information to be measured is constituted into the rear end light path of device by optical fiber circulator
Light；The reference light laser output has the optical signal of certain wavelength difference with detection light, is entered by the fiber optic splitter
Enter the rear end light path of device, form the first beam reference light, due to there is certain wavelength difference with detection light, so as to be used as light
Learn the reference light of heterodyne PDV velocity measuring techniques；The detection light of the optical fiber holes probe is injected, is made by its internal reflection device
The optical fiber circulator is back to, fraction luminous power, and enters by the optical fiber circulator rear end light path of device, shape
Into the second beam reference light, because the wavelength with detecting light is identical, so as to be used as the reference light of conventional PDV velocity measuring techniques；Two beams
Reference light is different due to source, different from the wavelength difference for detecting light, and the first beam reference light is produced with flashlight in the light path of rear end
Interference needed for raw optical heterodyne PDV velocity measuring techniques, the second beam reference light produces routine PDV surveys with flashlight in the light path of rear end
Interference needed for fast technology, and two kinds of interference informations are comprised in 1x2 fiber optic splitters output all the way in interference light, from
And after interference light just contains optical heterodyne PDV velocity measuring techniques simultaneously and routine PDV velocity measuring techniques detect to target to be measured
The velocity information got；Interference light is converted to voltage signal by the photodetector, then accesses the oscillograph and enter line number
According to collection, after certain data processing, you can obtain the speed change that target to be measured is measured respectively by two kinds of velocity measuring techniques
Change history, i.e. its n-t curve.
In the above-mentioned technical solutions, an optical fiber holes probe is used only in described device, and the optical fiber holes probe is
The film for possessing specific reflectance is coated with customed product, the end face of its internal optical fiber, the signal light laser injection is described
The detection light of optical fiber holes probe, is acted on by film, is had fraction luminous power and is back to the optical fiber circulator, and film
The determination method of reflectivity size is, the index makes after detection light acts on by film reflector herein, to be reflected back the fiber optic loop
The optical signal of shape device（I.e. described second beam reference light）Power limit is in the range of 200mW~500mW.It is described to possess specific reflection
The film of rate, can also be realized by other method, and optical fiber holes probe possesses specific return loss in itself as described, and returns
The size of ripple loss is equal to the reflectivity of the film, so as to can equally make the optical signal work(for being back to the optical fiber circulator
Rate is in the range of 200mW~500mW.
In the above-mentioned technical solutions, the power for the interference light all the way that can also be exported the 1x2 fiber optic splitters is divided into
（Usually divide equally）2 parts, 3 parts or more parts, then respectively enter multiple photodetectors and carry out opto-electronic conversions, then respectively by
Multiple channel oscilloscopes（The different amplitude ranges of setting）Collection, the channel oscilloscope of small-range is used for the amplitude point for improving signal
Resolution, the channel oscilloscope of wide range is used to ensure that signal will not lose number when there is amplitude fluctuation because of beyond screen
According to so as to while speed repetition measurement is carried out, can also simultaneously be carried out on the premise of not had any impact to speed repetition measurement
Amplitude repetition measurement.
The advantage of the invention is that：Solve current laser Doppler velocity technique both domestic and external be difficult by single holes probe and
Single set light channel structure realizes the problem of two kinds of velocity measuring techniques synchronization repetition measurements are carried out to a measuring point, meets shock wave and detonation substance
What the various fields such as reason, explosive research, light laser were proposed to velocity measuring technique carries out wanting for multiple technologies repetition measurement in single-shot experiment
Ask.
Advantage one：It is real to realize that two kinds of velocity measuring techniques synchronously carry out speed repetition measurement to a measuring point, rather than generally adopt at present
A velocity information of one of which technical limit spacing is subjected to " puppet " repetition measurement that slavish copying obtains many parts of velocity informations；
Advantage two：Single probe and single set light channel structure are only needed, while only needing to single photodetector and single showing
Ripple device passage, considerably reduces structure complexity, cost and the volume of velocity-measuring system；
Advantage three：The flashlight that interference is participated in each velocity measuring technique is not carry out power segmentation（Not by optical fiber point
Beam device is divided into two parts）Target surface light echo to be measured, i.e. signal light power is whole（Rather than 1/2）For in the light path of rear end with two
Plant the respective reference light of velocity measuring technique respectively to be interfered, so that two kinds of velocity measuring techniques can reach preferable interference condition simultaneously
（Signal light power is larger）, the signal quality of interference light preferably, carries out data processing to extract target to be measured to interference light
The difficulty of velocity information is greatly lowered, and the quality of speed data is also more preferable；
Advantage four：Target surface light echo to be measured -- the power of flashlight is very faint, split without power another
Advantage is that power is too small after can avoiding being divided, and it is larger to transmit to signal to noise ratio during the light path of rear end the degree being degraded, or even can
It can be flooded by the noise of some device in the light path of front end, so as to lose the target velocity to be measured of signal and its carrying before interference
The problem of information；
Advantage five：Light channel structure possesses stronger expansion, can expand do not having any impact to speed repetition measurement
On the premise of enter line amplitude repetition measurement simultaneously, i.e. progress speed repetition measurement and amplitude repetition measurement simultaneously.
Brief description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Fig. 1 is the basic structure of conventional PDV velocity measuring techniques；
Fig. 2 is the structure that conventional PDV velocity measuring techniques are generally used；
Fig. 3 is the rate signal that conventional PDV technologies are measured;
Fig. 4 is the structure that optical heterodyne PDV velocity measuring techniques are generally used;
Fig. 5 is the rate signal that optical heterodyne PDV technologies are measured；
Fig. 6 is to realize apparatus structure of two kinds of velocity measuring techniques to the synchronous repetition measurement of a measuring point using single probe monochromatic light road；
Fig. 7 is the rate signal that Fig. 6 shown devices are measured.
In figure：1- signal light lasers；2- optical fiber circulators；3- optical fiber holes probes；4- moving targets to be measured；5- is at a high speed
Photodetector；6- high bandwidth oscilloscopes；7- 1x2 fiber optic splitters；8- adjustable attenuators；9-2x2 fiber optic splitters；10- joins
Examine light laser.
Embodiment
As shown in fig. 6, being surveyed the inventive system comprises signal light laser, with reference to light laser, optical fiber circulator, optical fiber
Fast probe, 1x2 fiber optic splitters, photodetector and oscillograph, signal light laser export the detection light of enough power, passed through
Optical fiber circulator injection fibre holes probe, and be irradiated to from optical fiber holes probe on moving target to be measured, detection light is in fortune
Reflected on moving-target, part reflected light is by probe collection, and reverse transfer is to optical fiber circulator, after optical fiber circulator
Into the rear end light path of device, the flashlight for carrying target speed information to be measured is constituted；Exported with reference to light laser with detecting
Light has the optical signal of certain wavelength difference, power is adjusted into 200mW~500mW by adjustable attenuator, then pass through 1x2 optical fiber
Beam splitter enters the rear end light path of device, forms the first beam reference light, due to having certain wavelength difference with detection light, so that
Can as optical heterodyne PDV velocity measuring techniques reference light；The detection light of injection fibre holes probe, by its internal reflection device
Effect, fraction luminous power（200mW~500mW）Optical fiber circulator is back to, and is entered by optical fiber circulator after device
Light path is held, the second beam reference light is formed, because the wavelength with detecting light is identical, so as to be used as the ginseng of conventional PDV velocity measuring techniques
Examine light；Two beam reference lights are different due to source, different from the wavelength difference for detecting light, and the first beam reference light is with flashlight in rear end
The interference needed for optical heterodyne PDV velocity measuring techniques is produced in light path, the second beam reference light is produced with flashlight in the light path of rear end
Interference needed for conventional PDV velocity measuring techniques, so that interference light just contains optical heterodyne PDV velocity measuring techniques and routine PDV simultaneously
The velocity information that velocity measuring technique is got after being detected to target to be measured；Interference light is converted to voltage letter by photodetector
Number, then oscillograph progress data acquisition is accessed, finally by certain algorithm, after handling the data collected, you can
Obtain the velocity variations history that moving target to be measured is measured respectively by two kinds of velocity measuring techniques, i.e., respective n-t curves.
By above-mentioned technical proposal, the rate signal that measurement device of the present invention is arrived is as shown in Figure 7（Actual Detonation Experiments
In the actual signal that gets）.As can be seen from Figure 7, device of the invention, using single probe, is measured in single-shot experiment
To rate signal have two, wherein one（Coordinates regional bottom, no baseline）Measured by the routine PDV technologies shown in Fig. 3
Rate signal, another（, there is baseline on coordinates regional top）Speed shown in Fig. 5 measured by optical heterodyne PDV technologies
Signal.Single optical fiber holes probe, and only single light channel structure is used only in above-mentioned technical proposal（Can be real with Fig. 3 and Fig. 5 two
The structure of existing amplitude repetition measurement is compared, only one photodetector and a channel oscilloscope）, it is seen that utilize single holes probe
Light channel structure is covered with single, device of the present invention can carry out the synchronous repetition measurement of two kinds of velocity measuring techniques to a measuring point.
In the above-mentioned technical solutions, the optical fiber holes probe is customed product, is not that conventional PDV technologies are generally used
Structure（Can be with amplitude repetition measurement, as shown in Figure 2）Structure is generally used with optical heterodyne PDV technologies（Can be with amplitude repetition measurement, such as Fig. 4
It is shown）Used probe product, as it was previously stated, reflection is not caused in the probe product that two kinds of technologies are generally used, inside
Film, does not cause other devices of return loss, its remaining reflectivity yet（Or return loss）Index is to make to be back to light
The optical signal power of fine circulator is less than 1mW.In addition, the optical fiber holes probe is also not conventional PDV technologies basic structure
（Can not amplitude repetition measurement, only signal all the way, as shown in Figure 1）Used probe product, as it was previously stated, Fig. 1 probe productions used
Product carry out fraction reflection, reflectivity to the luminous power of injection probe（Or return loss）Index is that can make to be back to fiber optic loop
The optical signal power of shape device 2 is in the range of 500mW~1mW.In the inventive solutions, inside optical fiber holes probe used
It is coated with the film for possessing specific reflectance on the end face of optical fiber, the detection light of signal light laser injection fibre holes probe, by
The effect of film, has fraction luminous power and is back to optical fiber circulator, and the determination method of reflectivity of optical thin film size is that this refers to
Mark makes the optical signal power for being back to optical fiber circulator be limited in the range of 200mW~500mW, described to possess specific reflectance
Film, can also be realized by other method, and such as optical fiber holes probe possesses specific return loss in itself, and return loss
Size is equal to the reflectivity of the film, thus can equally make to be back to the optical signal power of optical fiber circulator 200mW~
In the range of 500mW, due to technology maturation, two methods easily realize the index.
In the above-mentioned technical solutions, the optical fiber holes probe is limited in the optical signal power for being back to optical fiber circulator
In the range of 200mW~500mW, and it is not that routine PDV and optical heterodyne PDV is each being used alone shown in Fig. 1, Fig. 2 and Fig. 4
500mW~1mW that Shi Tongchang is set, its reason is that conventional PDV and optical heterodyne PDV are in respective be used alone, photodetection
The reference light that device is received is only the reference light of a certain technology, is imitated to reach preferable interference condition with strengthening interference
Really, while making reference light（Power is higher）And flashlight（Power is weaker）Close line of the interference luminous power after beam in photodetector
Property it is interval（The service behaviour of photodetector can reach most preferably during hundreds of microwatts, but can not exceed its saturation value, and the value is general
In 1mW or so）, reference light is generally set to 500mW~1mW by adjustable attenuator.In the inventive solutions, it is described
Optical fiber holes probe makes the optical signal power for being back to optical fiber circulator in the range of 200mW~500mW, constitutes routine PDV's
Reference light, outputs it power by adjustable attenuator with reference to light laser and is also adjusted to 200mW~500mW, constitute outside optics
Poor PDV reference light, the reference light that photodetector is received is the reference light sum of two kinds of technologies, to avoid photodetector
Saturation, the reference luminous power of two kinds of technologies is both needed to be less than 500mW（The 1/2 of the power saturation value of photodetector 5）
The invention is not limited in foregoing embodiment.The present invention, which is expanded to, any in this manual to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (7)
1. a kind of realize two kinds of velocity measuring techniques to a measuring point while the device of repetition measurement using single probe monochromatic light road, it is characterised in that
Including signal light laser, reference laser diode, optical fiber circulator, optical fiber holes probe, 1x2 fiber optic splitters, photodetector
And oscillograph；The output end of the signal light laser is connected to optical fiber holes probe by optical fiber circulator；The reference swashs
The output end of light device is connected respectively to the 2 tunnels input of 1x2 fiber optic splitters, 1x2 optical fiber after attenuator with optical fiber circulator
The 1 tunnel output of beam splitter is sequentially connected photodetector and oscillograph；
The complete optical path of described device is：The signal light laser output detection light, institute is injected by the optical fiber circulator
Optical fiber holes probe is stated, and is irradiated to from the optical fiber holes probe on moving target to be measured, detection light is on moving target
Reflect, reflected light is by probe collection, and reverse transfer is to optical fiber circulator, then 1x2 optical fiber is entered by optical fiber circulator
The input of beam splitter, forms the flashlight for carrying target speed information to be measured；
The reference laser diode output has the optical signal of certain wavelength difference with detection light, into the 1x2 fiber optic splitters,
Form the first beam reference light, and produce with flashlight the interference needed for optical heterodyne PDV velocity measuring techniques；
The detection light of injection fibre holes probe, is acted on by optical fiber holes probe internal reflection device, and part luminous power is returned
Enter 1x2 fiber optic splitters to the optical fiber circulator, and by the optical fiber circulator, form the second beam reference light, simultaneously
The interference needed for routine PDV velocity measuring techniques is produced with flashlight；
The photodetector is detected and by oscilloscope display to the interference light all the way that 1x2 fiber optic splitters are exported.
2. one kind according to claim 1 realizes that two kinds of velocity measuring techniques are simultaneously multiple to a measuring point using single probe monochromatic light road
The device of survey, it is characterised in that the interference information of described two light is comprised in 1x2 fiber optic splitters output interference light all the way
In.
3. one kind according to claim 1 realizes that two kinds of velocity measuring techniques are simultaneously multiple to a measuring point using single probe monochromatic light road
The device of survey, it is characterised in that an optical fiber holes probe is used only in described device.
4. one kind according to claim 3 realizes that two kinds of velocity measuring techniques are simultaneously multiple to a measuring point using single probe monochromatic light road
The device of survey, it is characterised in that be coated with the film for possessing reflectivity on the end face of the optical fiber holes probe internal optical fiber.
5. one kind according to claim 4 realizes that two kinds of velocity measuring techniques are simultaneously multiple to a measuring point using single probe monochromatic light road
The device of survey, it is characterised in that the second beam that detection light returns to optical fiber circulator after by film reflector exists with reference to luminous power
In the range of 200mW~500mW.
6. one kind according to claim 1 realizes that two kinds of velocity measuring techniques are simultaneously multiple to a measuring point using single probe monochromatic light road
The device of survey, it is characterised in that the work(for the first beam reference light that the laser of the reference laser diode is formed after being decayed by attenuator
Rate is in the range of 200mW~500mW.
7. one kind according to claim 1 realizes that two kinds of velocity measuring techniques are simultaneously multiple to a measuring point using single probe monochromatic light road
The device of survey, it is characterised in that the optical maser wavelength that the laser of signal light laser transmitting is launched with reference laser diode not phase
Together.
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| CN107064539A (en) * | 2017-04-27 | 2017-08-18 | 中国工程物理研究院流体物理研究所 | A kind of big visual field photon Doppler speed measuring device and method |
| CN109085601B (en) * | 2018-09-18 | 2020-11-24 | 中国空气动力研究与发展中心超高速空气动力研究所 | High-speed model speed continuous measuring device and method for ballistic target |
| CN110018063A (en) * | 2019-04-22 | 2019-07-16 | 西南交通大学 | Sample test method and device for material deformation analysis |
| CN110296975B (en) * | 2019-05-29 | 2021-11-09 | 北京理工大学 | Rapid detection spectrum system for macroscopic parameters of energetic material |
| CN113671209B (en) * | 2021-10-25 | 2022-01-25 | 中国工程物理研究院流体物理研究所 | Space resolution-based flyer velocity field measurement system and attitude dynamic characterization method |
| CN114487467B (en) * | 2022-01-30 | 2023-04-18 | 中国工程物理研究院流体物理研究所 | Laser interference speed measuring device and method with retest function |
| CN114545018B (en) * | 2022-02-22 | 2024-01-30 | 中国工程物理研究院总体工程研究所 | Optical fiber broken piece speed measuring device and speed measuring method |
| CN114814266B (en) * | 2022-05-20 | 2023-04-14 | 中国工程物理研究院流体物理研究所 | Arc centripetal array speed measurement probe and speed measurement method |
| CN114839393B (en) * | 2022-05-20 | 2023-04-14 | 中国工程物理研究院流体物理研究所 | Arc-shaped divergent array speed measurement probe and speed measurement method |
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